Abstract:
The invention provides a heat transfer composition consisting essentially of from about 82 to about 88% by weight of trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)) and from about 12 to about 18% by weight of 1,1-difluoroethane (R-152a). The invention also provides a heat transfer composition comprising from about 5 to about 85% by weight R-1234ze(E), from about 2 to about 20% by weight R-152 a,  and from about 5 to about 60 by weight 1,1,1,2-tetrafluoroethane (R-134a).

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation of U.S. application Ser. No. 13/578,340, filed Oct. 24, 2012, which is the U.S. National Phase entry under 35 U.S.C. §371 of International Application No. PCT/GB2011/000200, filed Feb. 14, 2011, designating the United States and published in English on Aug. 25, 2011, as WO2011/101620, which claims priority to United Kingdom Application No. 1002616.9, filed Feb. 16, 2010, each of which is incorporated by reference in its entirety. 
     
    
     FIELD 
       [0002]    The invention relates to heat transfer compositions, and in particular to heat transfer compositions which may be suitable as replacements for existing refrigerants such as R-134a, R-152a, R-1234yf, R-22, R-410A, R-407A, R-407B, R-407C, R507 and R-404a. 
       BACKGROUND 
       [0003]    The listing or discussion of a prior-published document or any background in the specification should not necessarily be taken as an acknowledgement that a document or background is part of the state of the art or is common general knowledge. 
         [0004]    Mechanical refrigeration systems and related heat transfer devices such as heat pumps and air-conditioning systems are well known. In such systems, a refrigerant liquid evaporates at low pressure taking heat from the surrounding zone. The resulting vapour is then compressed and passed to a condenser where it condenses and gives off heat to a second zone, the condensate being returned through an expansion valve to the evaporator, so completing the cycle. Mechanical energy required for compressing the vapour and pumping the liquid is provided by, for example, an electric motor or an internal combustion engine. 
         [0005]    In addition to having a suitable boiling point and a high latent heat of vaporisation, the properties preferred in a refrigerant include low toxicity, non-flammability, non-corrosivity, high stability and freedom from objectionable odour. Other desirable properties are ready compressibility at pressures below 25 bars, low discharge temperature on compression, high refrigeration capacity, high efficiency (high coefficient of performance) and an evaporator pressure in excess of 1 bar at the desired evaporation temperature. 
         [0006]    Dichlorodifluoromethane (refrigerant R-12) possesses a suitable combination of properties and was for many years the most widely used refrigerant. Due to international concern that fully and partially halogenated chlorofluorocarbons were damaging the earth&#39;s protective ozone layer, there was general agreement that their manufacture and use should be severely restricted and eventually phased out completely. The use of dichlorodifluoromethane was phased out in the 1990&#39;s. 
         [0007]    Chlorodifluoromethane (R-22) was introduced as a replacement for R-12 because of its lower ozone depletion potential. Following concerns that R-22 is a potent greenhouse gas, its use is also being phased out. 
         [0008]    Whilst heat transfer devices of the type to which the present invention relates are essentially closed systems, loss of refrigerant to the atmosphere can occur due to leakage during operation of the equipment or during maintenance procedures. It is important, therefore, to replace fully and partially halogenated chlorofluorocarbon refrigerants by materials having zero ozone depletion potentials. 
         [0009]    In addition to the possibility of ozone depletion, it has been suggested that significant concentrations of halocarbon refrigerants in the atmosphere might contribute to global warming (the so-called greenhouse effect). It is desirable, therefore, to use refrigerants which have relatively short atmospheric lifetimes as a result of their ability to react with other atmospheric constituents such as hydroxyl radicals or as a result of ready degradation through photolytic processes. 
         [0010]    R-410A and R-407 refrigerants (including R-407A, R-407B and R-407C) have been introduced as a replacement refrigerant for R-22. However, R-22, R-410A and the R-407 refrigerants all have a high global warming potential (GWP, also known as greenhouse warming potential). 
         [0011]    1,1,1,2-tetrafluoroethane (refrigerant R-134a) was introduced as a replacement refrigerant for R-12. However, despite having no significant ozone depletion potential, R-134a has a GWP of 1300. It would be desirable to find replacements for R-134a that have a lower GWP. 
         [0012]    R-152a (1,1-difluoroethane) has been identified as an alternative to R-134a. It is somewhat more efficient than R-134a and has a greenhouse warming potential of 120. However the flammability of R-152a is judged too high, for example to permit its safe use in mobile air conditioning systems. In particular it is believed that its lower flammable limit in air is too low, its flame speeds are too high, and its ignition energy is too low. 
         [0013]    Thus there is a need to provide alternative refrigerants having improved properties such as low flammability. Fluorocarbon combustion chemistry is complex and unpredictable. It is not always the case that mixing a non-flammable fluorocarbon with a flammable fluorocarbon reduces the flammability of the fluid or reduces the range of flammable compositions in air. For example, the inventors have found that if non-flammable R-134a is mixed with flammable R-152a, the lower flammable limit of the mixture alters in a manner which is not predictable. The situation is rendered even more complex and less predictable if ternary compositions are considered. 
         [0014]    There is also a need to provide alternative refrigerants that may be used in existing devices such as refrigeration devices with little or no modification. 
         [0015]    R-1234yf (2,3,3,3-tetrafluoropropene) has been identified as a candidate alternative refrigerant to replace R-134a in certain applications, notably the mobile air conditioning or heat pumping applications. Its GWP is about 4. R-1234yf is flammable but its flammability characteristics are generally regarded as acceptable for some applications including mobile air conditioning or heat pumping. In particular, when compared with R-152a, its lower flammable limit is higher, its minimum ignition energy is higher and the flame speed in air is significantly lower than that of R-152a. 
         [0016]    The environmental impact of operating an air conditioning or refrigeration system, in terms of the emissions of greenhouse gases, should be considered with reference not only to the so-called “direct” GWP of the refrigerant, but also with reference to the so-called “indirect” emissions, meaning those emissions of carbon dioxide resulting from consumption of electricity or fuel to operate the system. Several metrics of this total GWP impact have been developed, including those known as Total Equivalent Warming Impact (TEWI) analysis, or Life-Cycle Carbon Production (LCCP) analysis. Both of these measures include estimation of the effect of refrigerant GWP and energy efficiency on overall warming impact. 
         [0017]    The energy efficiency and refrigeration capacity of R-1234yf have been found to be significantly lower than those of R-134a and in addition the fluid has been found to exhibit increased pressure drop in system pipework and heat exchangers. A consequence of this is that to use R-1234yf and achieve energy efficiency and cooling performance equivalent to R-134a, increased complexity of equipment and increased size of pipework is required, leading to an increase in indirect emissions associated with equipment. Furthermore, the production of R-1234yf is thought to be more complex and less efficient in its use of raw materials (fluorinated and chlorinated) than R-134a. So the adoption of R-1234yf to replace R-134a will consume more raw materials and result in more indirect emissions of greenhouse gases than does R-134a. 
         [0018]    Some existing technologies designed for R-134a may not be able to accept even the reduced flammability of some heat transfer compositions (any composition having a GWP of less than 150 is believed to be flammable to some extent). 
         [0019]    A principal object of the present invention is therefore to provide a heat transfer composition which is usable in its own right or suitable as a replacement for existing refrigeration usages which should have a reduced GWP, yet have a capacity and energy efficiency (which may be conveniently expressed as the “Coefficient of Performance”) ideally within 10% of the values, for example of those attained using existing refrigerants (e.g. R-134a, R-152a, R-1234yf, R-22, R-410A, R-407A, R-407B, R-407C, R507 and R-404a), and preferably within less than 10% (e.g. about 5%) of these values. It is known in the art that differences of this order between fluids are usually resolvable by redesign of equipment and system operational features. The composition should also ideally have reduced toxicity and acceptable flammability. 
       SUMMARY 
       [0020]    The subject invention addresses the above deficiencies by the provision of a heat transfer composition consisting essentially of from about 82 to about 88% by weight trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)) and from about 12 to about 18% by weight of 1,1-difluoroethane (R-152a). These will be referred to hereinafter as the binary compositions of the invention, unless otherwise stated. 
         [0021]    By the term “consist essentially of”, we mean that the compositions of the invention contain substantially no other components, particularly no further (hydro)(fluoro)compounds (e.g. (hydro)(fluoro)alkanes or (hydro)(fluoro)alkenes) known to be used in heat transfer compositions. We include the term “consist of” within the meaning of “consist essentially of”. 
         [0022]    All of the chemicals herein described are commercially available. For example, the fluorochemicals may be obtained from Apollo Scientific (UK). 
         [0023]    As used herein, all % amounts mentioned in compositions herein, including in the claims, are by weight based on the total weight of the compositions, unless otherwise stated. 
         [0024]    In a preferred embodiment, the binary compositions of the invention consist essentially of from about 83 to about 87% by weight of R-1234ze(E) and from about 13 to about 17% by weight of R-152a, or from about 84 to about 86% by weight of R-1234ze(E) and from about 14 to about 16% by weight of R-152a. 
         [0025]    For the avoidance of doubt, it is to be understood that the upper and lower values for ranges of amounts of components in the binary compositions of the invention may be interchanged in any way, provided that the resulting ranges fall within the broadest scope of the invention. For example, a binary composition of the invention may consist essentially of from about 82 to about 86% by weight of R-1234ze(E) and from about 14 to about 18% by weight of R-152a, or from about 84 to about 87% by weight of R-1234ze(E) and from about 13 to about 16% by weight of R-152a. 
         [0026]    In another embodiment, the compositions of the invention from about 2 to about 20% by weight R-152a, from about 5 to about 60% R-134a, and from about 5 to about 85% by weight R-1234ze(E). These will be referred to herein as the (ternary) compositions of the invention. 
         [0027]    The R-134a typically is included to reduce the flammability of the compositions of the invention, both in the liquid and vapour phases. Preferably, sufficient R-134a is included to render the compositions of the invention non-flammable. 
         [0028]    Preferred compositions of the invention comprise from about 5 to about 20% by weight R-152a, from about 10 to about 55% R-134a, and from about 30 to about 80% by weight R-1234ze(E). 
         [0029]    Advantageous compositions of the invention comprise from about 10 to about 18% by weight R-152a, from about 10 to about 50% R-134a, and from about 32 to about 78% by weight R-1234ze(E). 
         [0030]    Further preferred compositions of the invention comprise from about 12 to about 18% by weight R-152a, from about 20 to about 50% R-134a, and from about 32 to about 70% by weight R-1234ze(E). 
         [0031]    Further advantageous compositions of the invention comprise from about 15 to about 18% by weight R-152a, from about 15 to about 50% R-134a, and from about 32 to about 70% by weight R-1234ze(E). 
         [0032]    Preferably, the compositions of the invention which contain R-134a are non-flammable at a test temperature of 60° C. using the ASHRAE 34 methodology. 
         [0033]    The compositions of the invention containing R-1234ze(E), R-152a and R-134a may consist essentially (or consist of) these components. 
         [0034]    For the avoidance of doubt, any of the ternary compositions of the invention described herein, including those with specifically defined amounts of components, may consist essentially of (or consist of) the components defined in those compositions. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0035]      FIG. 1  is a chart with the vertices representing pure air, fuel and diluent with the point on the interior of the triangle representing mixtures of air, fuel and diluent. 
       
    
    
     DETAILED DESCRIPTION 
       [0036]    Compositions according to the invention conveniently comprise substantially no R-1225 (pentafluoropropene), conveniently substantially no R-1225ye (1,2,3,3,3-pentafluoropropene) or R-1225zc (1,1,3,3,3-pentafluoropropene), which compounds may have associated toxicity issues. 
         [0037]    By “substantially no”, we include the meaning that the compositions of the invention contain 0.5% by weight or less of the stated component, preferably 0.1% or less, based on the total weight of the composition. 
         [0038]    The compositions of the invention may contain substantially no: 
         [0039]    (i) 2,3,3,3-tetrafluoropropene (R-1234yf), 
         [0040]    (ii) cis-1,3,3,3-tetrafluoropropene (R-1234ze(Z)), and/or 
         [0041]    (iii) 3,3,3-tetrafluoropropene (R-1243zf). 
         [0042]    The compositions of the invention have zero ozone depletion potential. 
         [0043]    Preferably, the compositions of the invention (e.g. those that are suitable refrigerant replacements for R-134a, R-1234yf or R-152a) have a GWP that is less than 1300, preferably less than 1000, more preferably less than 500, 400, 300 or 200, especially less than 150 or 100, even less than 50 in some cases. Unless otherwise stated, IPCC (Intergovernmental Panel on Climate Change) TAR (Third Assessment Report) values of GWP have been used herein. 
         [0044]    Advantageously, the compositions are of reduced flammability hazard when compared to the individual flammable components of the compositions, e.g. R-152a. Preferably, the compositions are of reduced flammability hazard when compared to R-1234yf. 
         [0045]    In one aspect, the compositions have one or more of (a) a higher lower flammable limit; (b) a higher ignition energy; or (c) a lower flame velocity compared to R-152a or R-1234yf. In a preferred embodiment, the compositions of the invention are non-flammable. Advantageously, the mixtures of vapour that exist in equilibrium with the compositions of the invention at any temperature between about −20° C. and 60° C. are also non-flammable. 
         [0046]    Flammability may be determined in accordance with ASHRAE Standard 34 incorporating the ASTM Standard E-681 with test methodology as per Addendum 34p dated 2004, the entire content of which is incorporated herein by reference. 
         [0047]    In some applications it may not be necessary for the formulation to be classed as non-flammable by the ASHRAE 34 methodology; it is possible to develop fluids whose flammability limits will be sufficiently reduced in air to render them safe for use in the application, for example if it is physically not possible to make a flammable mixture by leaking the refrigeration equipment charge into the surrounds. We have found that the effect of adding R-1234ze(E) to flammable refrigerant R-152a is to modify the flammability in mixtures with air in this manner. 
         [0048]    It is known that the flammability of mixtures of hydrofluorocarbons, (HFCs) or hydrofluorocarbons plus hydrofluoro-olefins, is related to the proportion of carbon-fluorine bonds relative to carbon-hydrogen bonds. This can be expressed as the ratio R=F/(F+H) where, on a molar basis, F represents the total number of fluorine atoms and H represents the total number of hydrogen atoms in the composition. This is referred to herein as the fluorine ratio, unless otherwise stated. 
         [0049]    For example, Takizawa et al, Reaction Stoichiometry for Combustion of Fluoroethane Blends, ASHRAE Transactions 112(2) 2006 (which is incorporated herein by reference), shows there exists a near-linear relationship between this ratio and the flame speed of mixtures comprising R-152a, with increasing fluorine ratio resulting in lower flame speeds. The data in this reference teach that the fluorine ratio needs to be greater than about 0.65 for the flame speed to drop to zero, in other words, for the mixture to be non-flammable. 
         [0050]    Similarly, Minor et al (Du Pont Patent Application WO2007/053697) provide teaching on the flammability of many hydrofluoroolefins, showing that such compounds could be expected to be non-flammable if the fluorine ratio is greater than about 0.7. 
         [0051]    It may be expected on the basis of the art, therefore, that mixtures containing R-152a (fluorine ratio 0.33) and R-1234ze(E) (fluorine ratio 0.67) would be flammable except for limited compositional ranges comprising almost 100% R-1234ze(E), since any amount of R-152a added to the olefin would reduce the fluorine ratio of the mixture below 0.67. 
         [0052]    Surprisingly, we have found this not to be the case. In particular, we have found that binary blends of R-152a and R-1234ze(E) having a fluorine ratio of less than 0.7 exist that are non-flammable at 23° C. As shown in the examples hereinafter, the binary compositions of the invention are non-flammable even though they have a fluorine ratio as low as about 0.58. 
         [0053]    In one embodiment, the compositions of the invention have a fluorine ratio of from about 0.57 to about 0.61, such as from about 0.58 to about 0.60. 
         [0054]    By producing non-flammable R-152a/R-1234ze(E) blends containing surprisingly small amounts of R-1234ze(E), the amount of R-152a in such compositions is increased. This is believed to result in heat transfer compositions exhibiting, for example, increased cooling capacity, decreased temperature glide and/or decreased pressure drop, compared to equivalent composition containing higher amounts (e.g. almost 100%) R-1234ze(E). 
         [0055]    Thus, the compositions of the invention exhibit a completely unexpected combination of non-flammability, low GWP and improved refrigeration performance properties. Some of these refrigeration performance properties are explained in more detail below. 
         [0056]    Temperature glide, which can be thought of as the difference between bubble point and dew point temperatures of a zeotropic (non-azeotropic) mixture at constant pressure, is a characteristic of a refrigerant; if it is desired to replace a fluid with a mixture then it is often preferable to have similar or reduced glide in the alternative fluid. In an embodiment, the compositions of the invention are zeotropic. 
         [0057]    Conveniently, the temperature glide (in the evaporator) of the compositions of the invention is less than about 10K, preferably less than about 5K, advantageously less than 3K. 
         [0058]    Advantageously, the volumetric refrigeration capacity of the compositions of the invention is at least 85% of the existing refrigerant fluid it is replacing, preferably at least 90% or even at least 95%. 
         [0059]    The compositions of the invention typically have a volumetric refrigeration capacity that is at least 90% of that of R-1234yf. Preferably, the compositions of the invention have a volumetric refrigeration capacity that is at least 95% of that of R-1234yf, for example from about 95% to about 120% of that of R-1234yf. 
         [0060]    In one embodiment, the cycle efficiency (Coefficient of Performance, COP) of the compositions of the invention is within about 5% or even better than the existing refrigerant fluid it is replacing 
         [0061]    Conveniently, the compressor discharge temperature of the compositions of the invention is within about 15K of the existing refrigerant fluid it is replacing, preferably about 10K or even about 5K. 
         [0062]    The compositions of the invention preferably have energy efficiency at least 95% (preferably at least 98%) of R-134a under equivalent conditions, while having reduced or equivalent pressure drop characteristic and cooling capacity at 95% or higher of R-134a values. Advantageously the compositions have higher energy efficiency and lower pressure drop characteristics than R-134a under equivalent conditions. The compositions also advantageously have better energy efficiency and pressure drop characteristics than R-1234yf alone. 
         [0063]    The heat transfer compositions of the invention are suitable for use in existing designs of equipment, and are compatible with all classes of lubricant currently used with established HFC refrigerants. They may be optionally stabilized or compatibilized with mineral oils by the use of appropriate additives. 
         [0064]    Preferably, when used in heat transfer equipment, the composition of the invention is combined with a lubricant. 
         [0065]    Conveniently, the lubricant is selected from the group consisting of mineral oil, silicone oil, polyalkyl benzenes (PABs), polyol esters (POEs), polyalkylene glycols (PAGs), polyalkylene glycol esters (PAG esters), polyvinyl ethers (PVEs), poly (alpha-olefins) and combinations thereof. 
         [0066]    Advantageously, the lubricant further comprises a stabiliser. 
         [0067]    Preferably, the stabiliser is selected from the group consisting of diene-based compounds, phosphates, phenol compounds and epoxides, and mixtures thereof. 
         [0068]    Conveniently, the composition of the invention may be combined with a flame retardant. 
         [0069]    Advantageously, the flame retardant is selected from the group consisting of tri-(2-chloroethyl)-phosphate, (chloropropyl) phosphate, tri-(2,3-dibromopropyl)-phosphate, tri-(1,3-dichloropropyl)-phosphate, diammonium phosphate, various halogenated aromatic compounds, antimony oxide, aluminium trihydrate, polyvinyl chloride, a fluorinated iodocarbon, a fluorinated bromocarbon, trifluoro iodomethane, perfluoroalkyl amines, bromo-fluoroalkyl amines and mixtures thereof. 
         [0070]    Preferably, the heat transfer composition is a refrigerant composition. 
         [0071]    In one embodiment, the invention provides a heat transfer device comprising a composition of the invention. 
         [0072]    Preferably, the heat transfer device is a refrigeration device. 
         [0073]    Conveniently, the heat transfer device is selected from group consisting of automotive air conditioning systems, residential air conditioning systems, commercial air conditioning systems, residential refrigerator systems, residential freezer systems, commercial refrigerator systems, commercial freezer systems, chiller air conditioning systems, chiller refrigeration systems, and commercial or residential heat pump systems. Preferably, the heat transfer device is a refrigeration device or an air-conditioning system. 
         [0074]    Advantageously, the heat transfer device contains a centrifugal-type compressor. 
         [0075]    The invention also provides the use of a composition of the invention in a heat transfer device as herein described. 
         [0076]    According to a further aspect of the invention, there is provided a blowing agent comprising a composition of the invention. 
         [0077]    According to another aspect of the invention, there is provided a foamable composition comprising one or more components capable of forming foam and a composition of the invention. 
         [0078]    Preferably, the one or more components capable of forming foam are selected from polyurethanes, thermoplastic polymers and resins, such as polystyrene, and epoxy resins. 
         [0079]    According to a further aspect of the invention, there is provided a foam obtainable from the foamable composition of the invention. 
         [0080]    Preferably the foam comprises a composition of the invention. 
         [0081]    According to another aspect of the invention, there is provided a sprayable composition comprising a material to be sprayed and a propellant comprising a composition of the invention. 
         [0082]    According to a further aspect of the invention, there is provided a method for cooling an article which comprises condensing a composition of the invention and thereafter evaporating said composition in the vicinity of the article to be cooled. 
         [0083]    According to another aspect of the invention, there is provided a method for heating an article which comprises condensing a composition of the invention in the vicinity of the article to be heated and thereafter evaporating said composition. 
         [0084]    According to a further aspect of the invention, there is provided a method for extracting a substance from biomass comprising contacting the biomass with a solvent comprising a composition of the invention, and separating the substance from the solvent. 
         [0085]    According to another aspect of the invention, there is provided a method of cleaning an article comprising contacting the article with a solvent comprising a composition of the invention. 
         [0086]    According to a further aspect of the invention, there is provided a method for extracting a material from an aqueous solution comprising contacting the aqueous solution with a solvent comprising a composition of the invention, and separating the material from the solvent. 
         [0087]    According to another aspect of the invention, there is provided a method for extracting a material from a particulate solid matrix comprising contacting the particulate solid matrix with a solvent comprising a composition of the invention, and separating the material from the solvent. 
         [0088]    According to a further aspect of the invention, there is provided a mechanical power generation device containing a composition of the invention. 
         [0089]    Preferably, the mechanical power generation device is adapted to use a Rankine Cycle or modification thereof to generate work from heat. 
         [0090]    According to another aspect of the invention, there is provided a method of retrofitting a heat transfer device comprising the step of removing an existing heat transfer fluid, and introducing a composition of the invention. Preferably, the heat transfer device is a refrigeration device or (a static) air conditioning system. Advantageously, the method further comprises the step of obtaining an allocation of greenhouse gas (e.g. carbon dioxide) emission credit. 
         [0091]    In accordance with the retrofitting method described above, an existing heat transfer fluid can be fully removed from the heat transfer device before introducing a composition of the invention. An existing heat transfer fluid can also be partially removed from a heat transfer device, followed by introducing a composition of the invention. 
         [0092]    In another embodiment wherein the existing heat transfer fluid is R-134a, and the composition of the invention contains R134a, R-1234ze(E) and R-152a (and optional components as a lubricant, a stabiliser or a flame retardant), R-1234ze(E), R-152a, etc, can be added to the R-134a in the heat transfer device, thereby forming the compositions of the invention, and the heat transfer device of the invention, in situ. Some of the existing R-134a may be removed from the heat transfer device prior to adding the R-1234ze(E), R-152a, etc to facilitate providing the components of the compositions of the invention in the desired proportions. 
         [0093]    Thus, the invention provides a method for preparing a composition and/or heat transfer device of the invention comprising introducing R-1234ze(E) and R-152a, and optional components such as a lubricant, a stabiliser or a flame retardant, into a heat transfer device containing an existing heat transfer fluid which is R-134a. Optionally, at least some of the R-134a is removed from the heat transfer device before introducing the R-1234ze(E), R-152a, etc. 
         [0094]    Of course, the compositions of the invention may also be prepared simply by mixing the R-1234ze(E) and R-152a, optionally R-134a (and optional components such as a lubricant, a stabiliser or a flame retardant) in the desired proportions. The compositions can then be added to a heat transfer device (or used in any other way as defined herein) that does not contain R-134a or any other existing heat transfer fluid, such as a device from which R-134a or any other existing heat transfer fluid have been removed. 
         [0095]    In a further aspect of the invention, there is provided a method for reducing the environmental impact arising from operation of a product comprising an existing compound or composition, the method comprising replacing at least partially the existing compound or composition with a composition of the invention. Preferably, this method comprises the step of obtaining an allocation of greenhouse gas emission credit. 
         [0096]    By environmental impact we include the generation and emission of greenhouse warming gases through operation of the product. 
         [0097]    As mentioned above, this environmental impact can be considered as including not only those emissions of compounds or compositions having a significant environmental impact from leakage or other losses, but also including the emission of carbon dioxide arising from the energy consumed by the device over its working life. Such environmental impact may be quantified by the measure known as Total Equivalent Warming Impact (TEWI). This measure has been used in quantification of the environmental impact of certain stationary refrigeration and air conditioning equipment, including for example supermarket refrigeration systems (see, for example, http://en.wikipedia.org/wiki/Total_equivalent_warming_impact). 
         [0098]    The environmental impact may further be considered as including the emissions of greenhouse gases arising from the synthesis and manufacture of the compounds or compositions. In this case the manufacturing emissions are added to the energy consumption and direct loss effects to yield the measure known as Life-Cycle Carbon Production (LCCP, see for example http://www.sae.org/events/aars/presentations/2007papasavva.pdf). The use of LCCP is common in assessing environmental impact of automotive air conditioning systems. 
         [0099]    Emission credit(s) are awarded for reducing pollutant emissions that contribute to global warming and may, for example, be banked, traded or sold. They are conventionally expressed in the equivalent amount of carbon dioxide. Thus if the emission of 1 kg of R-134a is avoided then an emission credit of 1×1300=1300 kg CO2 equivalent may be awarded. 
         [0100]    In another embodiment of the invention, there is provided a method for generating greenhouse gas emission credit(s) comprising (i) replacing an existing compound or composition with a composition of the invention, wherein the composition of the invention has a lower GWP than the existing compound or composition; and (ii) obtaining greenhouse gas emission credit for said replacing step. 
         [0101]    In a preferred embodiment, the use of the composition of the invention results in the equipment having a lower Total Equivalent Warming Impact, and/or a lower Life-Cycle Carbon Production than that which would be attained by use of the existing compound or composition. 
         [0102]    These methods may be carried out on any suitable product, for example in the fields of air-conditioning, refrigeration (e.g. low and medium temperature refrigeration), heat transfer, blowing agents, aerosols or sprayable propellants, gaseous dielectrics, cryosurgery, veterinary procedures, dental procedures, fire extinguishing, flame suppression, solvents (e.g. carriers for flavorings and fragrances), cleaners, air horns, pellet guns, topical anesthetics, and expansion applications. Preferably, the field is air-conditioning or refrigeration. 
         [0103]    Examples of suitable products include a heat transfer devices, blowing agents, foamable compositions, sprayable compositions, solvents and mechanical power generation devices. In a preferred embodiment, the product is a heat transfer device, such as a refrigeration device or an air-conditioning unit. 
         [0104]    The existing compound or composition has an environmental impact as measured by GWP and/or TEWI and/or LCCP that is higher than the composition of the invention which replaces it. The existing compound or composition may comprise a fluorocarbon compound, such as a perfluoro-, hydrofluoro-, chlorofluoro- or hydrochlorofluoro-carbon compound or it may comprise a fluorinated olefin 
         [0105]    Preferably, the existing compound or composition is a heat transfer compound or composition such as a refrigerant. Examples of refrigerants that may be replaced include R-134a, R-152a, R-1234yf, R-410A, R-407A, R-407B, R-407C, R507, R-22 and R-404A. The compositions of the invention are particularly suited as replacements for R-134a, R-152a or R-1234yf. 
         [0106]    Any amount of the existing compound or composition may be replaced so as to reduce the environmental impact. This may depend on the environmental impact of the existing compound or composition being replaced and the environmental impact of the replacement composition of the invention. Preferably, the existing compound or composition in the product is fully replaced by the composition of the invention. 
         [0107]    The invention is illustrated by the following non-limiting examples. 
       EXAMPLES 
     Flammability 
       [0108]    The flammability of R-152a in air at atmospheric pressure and controlled humidity was studied in a test flask apparatus as described by the methodology of ASHRAE standard 34. The test temperature used was 23° C.; the humidity was controlled to be 50% relative to a standard temperature of 77° F. (25° C.). The diluent used was R-1234ze(E), which was found to be non flammable under these test conditions. The fuel and diluent gases were subjected to vacuum purging of the cylinder to remove dissolved air or other inert gases prior to testing. 
         [0109]    The results of this testing are shown in  FIG. 1 , where the vertices of the chart represent pure air, fuel and diluent. Points on the interior of the triangle represent mixtures of air, fuel and diluent. The flammable region of such mixtures was found by experimentation and is enclosed by the curved line. 
         [0110]    It was found that binary mixtures of R-152a and R-1234ze(E) containing at least 70% v/v (about 80% w/w) R-1234ze(E) were non-flammable when mixed with air in all proportions. This is shown by the solid line on the diagram, which is a tangent to the flammable region and represents the mixing line of air with a fuel/diluent mixture in the proportions 70% v/v diluent to 30% v/v fuel. 
         [0111]    Using the above methodology we have found the following compositions to be non-flammable at 23° C. (associated fluorine ratios are also shown). 
         [0000]    
       
         
               
               
               
             
           
               
                   
               
               
                 Non-flammable mixture 
                   
                   
               
               
                 composition (volumetric 
                 Fluorine ratio 
                 Composition on a 
               
               
                 basis) 
                 R = F/(F + H) 
                 weight/weight basis 
               
               
                   
               
             
             
               
                 R-152a 30%, R-1234ze(E) 
                 0.567 
                 R-152a 19.9%, R- 
               
               
                 70% 
                   
                 1234ze(E) 80.1% 
               
               
                 R-152a 27.5%, R- 
                 0.575 
                 R-152a 18%, R-1234ze(E) 
               
               
                 1234ze(E) 72.5% 
                   
                 82% 
               
               
                 R-152a 20%, R-1234ze(E) 
                 0.600 
                 R-152a 12.6%, R- 
               
               
                 80% 
                   
                 1234ze(E) 87.4% 
               
               
                 R-152a 10%, R-1234ze(E) 
                 0.633 
                 R-152a 6.1%, R- 
               
               
                 90% 
                   
                 1234ze(E) 93.9% 
               
               
                   
               
             
          
         
       
     
         [0112]    It can be seen that non flammable mixtures comprising R-152a and R-1234ze(E) can be created if the fluorine ratio of the mixture is greater than about 0.57. 
         [0000]    Performance of R-152a/R-1234ze and R-152a/R-1234ze/R-134a Blends 
         [0113]    The performance of selected binary and ternary compositions of the invention was estimated using a thermodynamic property model in conjunction with an idealised vapour compression cycle. The thermodynamic model used the Peng Robinson equation of state to represent vapour phase properties and vapour-liquid equilibrium of the mixtures, together with a polynomial correlation of the variation of ideal gas enthalpy of each component of the mixtures with temperature. The principles behind use of this equation of state to model thermodynamic properties and vapour liquid equilibrium are explained more fully in  The Properties of Gases and Liquids  (5 th  edition) by B E Poling, J M Prausnitz and J M O&#39;Connell pub. McGraw Hill 2000, in particular Chapters 4 and 8 (which is incorporated herein by reference). 
         [0114]    The basic property data required to use this model were: critical temperature and critical pressure; vapour pressure and the related property of Pitzer acentric factor; ideal gas enthalpy, and measured vapour liquid equilibrium data for the binary system R-152a/R-1234ze(E). 
         [0115]    The basic property data (critical properties, acentric factor, vapour pressure and ideal gas enthalpy) for R-152a and R-134a were derived from literature sources including: NIST REFPROP 8.0 (which is incorporated herein by reference). The critical point and vapour pressure for R-1234ze(E) were measured experimentally. The ideal gas enthalpy for R-1234ze(E) over a range of temperatures was estimated using the molecular modelling software Hyperchem 7.5, which is incorporated herein by reference. 
         [0116]    Vapour liquid equilibrium data for the binary mixtures was regressed to the Peng Robinson equation using a binary interaction constant incorporated into van der Waal&#39;s mixing rules as follows. Vapour liquid equilibrium data for R-152a with R-1234ze(E) was modelled by using the equation of state with van der Waals mixing rules and optimising the interaction constant to reproduce the known azeotropic composition of approximately 28% by weight R-1234ze(E) at −25° C. Vapour liquid equilibrium data for R-152a with R-134a was taken from the literature, notably the references cited in the NIST REFPROP code, and the data used to regress a value of interaction constant. Vapour liquid equilibrium data for R-134a with R-1234ze(E) was measured in an isothermal recirculating still over the range −40 to +50° C. and the resulting data were also fitted to the Peng Robinson equation. No azeotrope was found to exist between R-134a and R-1234ze(E) in this temperature range. 
         [0117]    The refrigeration performance of selected compositions of the invention were modelled using the following cycle conditions. 
         [0000]    
       
         
               
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 Condensing temperature (° C.) 
                 60 
               
               
                   
                 Evaporating temperature (° C.) 
                 0 
               
               
                   
                 Subcool (K) 
                 5 
               
               
                   
                 Superheat (K) 
                 5 
               
               
                   
                 Suction temperature (° C.) 
                 15 
               
               
                   
                 Isentropic efficiency 
                 65% 
               
               
                   
                 Clearance ratio 
                  4% 
               
               
                   
                 Duty (kW) 
                 6 
               
               
                   
                 Suction line diameter (mm) 
                 16.2 
               
               
                   
                   
               
             
          
         
       
     
         [0118]    The refrigeration performance data of these compositions are set out in the following tables. 
         [0119]    The binary compositions offer non-flammability and enhanced energy efficiency compared to R-1234yf, and offer significantly enhanced capacity compared to R-1234ze(E) alone. The suction line pressure drop is also more favourable than R-1234ze(E) and for most of the compositions the pressure drop is also more favourable than for R-1234yf. The practical effect of this will be that in a real system the effective capacity of the compositions as compared to R-1234yf will be somewhat higher than that predicted by theory, since the effect of reducing suction pressure drop is to increase the effective throughput capability of the system compressor. This is especially true for automotive air conditioning or heat pump systems. 
         [0120]    The ternary compositions of the invention offer further increased cooling capacity as compared to R-1234ze(E) while reducing further the flammability of the mixture. Surprisingly, it is possible to achieve performance close to that expected from non-flammable mixtures of R-152a and R-134a at a significantly lower GWP for the fluid. 
         [0000]    
       
         
               
             
               
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                 Theoretical Performance Data of R-152a/R-1234ze(E) Compositions of the Invention 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 R152a 
                 % b/w 
                   
                   
                   
                 12 
                 13 
                 14 
                 15 
                 16 
                 17 
                 18 
               
               
                 R1234ze(E) 
                 % b/w 
                   
                   
                   
                 88 
                 87 
                 86 
                 85 
                 84 
                 83 
                 82 
               
               
                   
               
               
                 Calculation results 
                   
                 134a 
                 R1234yf 
                 R1234ze(E) 
                 12/88 
                 13/87 
                 14/86 
                 15/85 
                 6/84 
                 17/83 
                 18/82 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.79 
                 5.24 
                 5.75 
                 5.71 
                 5.71 
                 5.70 
                 5.70 
                 5.70 
                 5.69 
                 5.69 
               
               
                 Volumetric 
                   
                 83.6% 
                 84.7% 
                 82.8% 
                 83.3% 
                 83.3% 
                 83.4% 
                 83.4% 
                 83.4% 
                 83.5% 
                 83.5% 
               
               
                 efficiency 
               
               
                 condenser glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.4 
                 0.4 
                 0.4 
                 0.4 
                 0.4 
                 0.4 
                 0.5 
               
               
                 Evaporator glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.3 
                 0.3 
                 0.3 
                 0.3 
                 0.3 
                 0.3 
                 0.3 
               
               
                 Evaporator inlet 
                 ° C. 
                 0.0 
                 0.0 
                 0.0 
                 −0.1 
                 −0.1 
                 −0.1 
                 −0.1 
                 −0.1 
                 −0.1 
                 −0.1 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 55.0 
                 55.0 
                 55.0 
                 54.8 
                 54.8 
                 54.8 
                 54.8 
                 54.8 
                 54.8 
                 54.8 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 16.88 
                 16.46 
                 12.38 
                 13.16 
                 13.22 
                 13.28 
                 13.33 
                 13.38 
                 13.43 
                 13.48 
               
               
                 Evaporator pressure 
                 bar 
                 2.92 
                 3.14 
                 2.15 
                 2.31 
                 2.32 
                 2.33 
                 2.34 
                 2.35 
                 2.36 
                 2.37 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 123.76 
                 94.99 
                 108.63 
                 119.92 
                 120.86 
                 121.81 
                 122.77 
                 123.72 
                 124.68 
                 125.63 
               
               
                 COP 
                   
                 2.03 
                 1.91 
                 2.01 
                 2.04 
                 2.04 
                 2.05 
                 2.05 
                 2.05 
                 2.05 
                 2.05 
               
               
                 Discharge 
                 ° C. 
                 99.15 
                 92.88 
                 86.66 
                 90.80 
                 91.13 
                 91.46 
                 91.79 
                 92.12 
                 92.44 
                 92.77 
               
               
                 temperature 
               
               
                 Mass flow rate 
                 kg/hr 
                 174.53 
                 227.39 
                 198.83 
                 180.13 
                 178.71 
                 177.32 
                 175.94 
                 174.59 
                 173.25 
                 171.93 
               
               
                 Volumetric flow 
                 m 3 /hr 
                 13.16 
                 14.03 
                 18.29 
                 16.81 
                 16.71 
                 16.61 
                 16.51 
                 16.42 
                 16.33 
                 16.24 
               
               
                 rate 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1641 
                 1540 
                 1181 
                 1285 
                 1293 
                 1301 
                 1308 
                 1316 
                 1323 
                 1330 
               
               
                 Pressure drop 
                 kPa/m 
                 953 
                 1239 
                 1461 
                 1247 
                 1232 
                 1217 
                 1203 
                 1189 
                 1176 
                 1163 
               
               
                 Gas density at 
                 kg/m 3   
                 13.26 
                 16.21 
                 10.87 
                 10.71 
                 10.70 
                 10.68 
                 10.66 
                 10.63 
                 10.61 
                 10.59 
               
               
                 evaporator exit 
               
               
                 Gas density at 
                 kg/m 3   
                 86.37 
                 99.16 
                 67.78 
                 66.54 
                 66.39 
                 66.24 
                 66.09 
                 65.93 
                 65.77 
                 65.60 
               
               
                 condenser inlet 
               
               
                 GWP (AR4) 
                   
                 1430 
                 4 
                 6 
                 20 
                 21 
                 23 
                 24 
                 25 
                 26 
                 27 
               
               
                 GWP (TAR) 
                   
                   
                   
                 6 
                 20 
                 21 
                 22 
                 23 
                 24 
                 25 
                 27 
               
               
                 F/(F + H) 
                   
                   
                   
                 0.667 
                 0.603 
                 0.598 
                 0.594 
                 0.589 
                 0.584 
                 0.580 
                 0.575 
               
               
                 Capacity relative 
                   
                 106.6% 
                 100.0% 
                 76.7% 
                 83.5% 
                 84.0% 
                 84.5% 
                 85.0% 
                 85.4% 
                 85.9% 
                 86.4% 
               
               
                 to 1234yf 
               
               
                 Relative COP 
                   
                 106.0% 
                 100.0% 
                 105.3% 
                 106.8% 
                 106.9% 
                 107.0% 
                 107.1% 
                 107.2% 
                 107.3% 
                 107.4% 
               
               
                 Relative pressure 
                   
                 76.9% 
                 100.0% 
                 117.9% 
                 100.6% 
                 99.4% 
                 98.2% 
                 97.1% 
                 96.0% 
                 94.9% 
                 93.8% 
               
               
                 drop 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                 Theoretical Performance Data of Selected R-152a/R-1234ze(E)/R-134a Blends 
               
               
                 containing 12% b/w R-152a 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                 12 
                 12 
                 12 
               
               
                 R-134a (% b/w) 
                 10 
                 15 
                 20 
               
               
                 R-1234ze(E) (% b/w) 
                 78 
                 73 
                 68 
               
               
                   
               
             
          
           
               
                   
                 COMPARATIVE DATA 
                   
               
             
          
           
               
                 Calculation results 
                   
                 134a 
                 R1234yf 
                 R1234ze(E) 
                 12/10/78 
                 12/15/73 
                 12/20/68 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.79 
                 5.24 
                 5.75 
                 5.70 
                 5.69 
                 5.68 
               
               
                 Volumetric efficiency 
                   
                 83.6% 
                 84.7% 
                 82.8% 
                 83.4% 
                 83.4% 
                 83.5% 
               
               
                 condenser glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.7 
                 0.7 
                 0.7 
               
               
                 Evaporator glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.4 
                 0.4 
                 0.4 
               
               
                 Evaporator inlet 
                 ° C. 
                 0.0 
                 0.0 
                 0.0 
                 −0.2 
                 −0.2 
                 −0.2 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 55.0 
                 55.0 
                 55.0 
                 54.7 
                 54.6 
                 54.6 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 16.88 
                 16.46 
                 12.38 
                 13.74 
                 14.01 
                 14.27 
               
               
                 Evaporator pressure 
                 bar 
                 2.92 
                 3.14 
                 2.15 
                 2.41 
                 2.46 
                 2.51 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 123.76 
                 94.99 
                 108.63 
                 120.82 
                 121.29 
                 121.78 
               
               
                 COP 
                   
                 2.03 
                 1.91 
                 2.01 
                 2.04 
                 2.04 
                 2.04 
               
               
                 Discharge temperature 
                 ° C. 
                 99.15 
                 92.88 
                 86.66 
                 91.93 
                 92.49 
                 93.04 
               
               
                 Mass flow rate 
                 kg/hr 
                 174.53 
                 227.39 
                 198.83 
                 178.77 
                 178.08 
                 177.36 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 13.16 
                 14.03 
                 18.29 
                 16.10 
                 15.78 
                 15.49 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1641 
                 1540 
                 1181 
                 1342 
                 1369 
                 1395 
               
               
                 Pressure drop 
                 kPa/m 
                 953 
                 1239 
                 1461 
                 1187 
                 1160 
                 1135 
               
               
                 GWP (TAR BASIS) 
                   
                   
                   
                 6 
                 149 
                 214 
                 278 
               
               
                 F/(F + H) 
                   
                   
                   
                 0.667 
                 0.604 
                 0.604 
                 0.604 
               
               
                 Capacity relative to 
                   
                 106.6% 
                 100.0% 
                 76.7% 
                 87.1% 
                 88.9% 
                 90.6% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 106.0% 
                 100.0% 
                 105.3% 
                 106.7% 
                 106.6% 
                 106.6% 
               
               
                 Relative pressure drop 
                   
                 76.9% 
                 100.0% 
                 117.9% 
                 95.8% 
                 93.7% 
                 91.6% 
               
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                   
                 12 
                 12 
                 12 
                 12 
                 12 
                 12 
               
               
                 R-134a (% b/w) 
                   
                 25 
                 30 
                 35 
                 40 
                 45 
                 50 
               
               
                 R-1234ze(E) (% b/w) 
                   
                 63 
                 58 
                 53 
                 48 
                 43 
                 38 
               
               
                   
               
               
                 Calculation results 
                   
                 12/25/63 
                 12/30/58 
                 12/35/53 
                 12/40/48 
                 12/45/43 
                 12/50/38 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.68 
                 5.67 
                 5.67 
                 5.67 
                 5.67 
                 5.67 
               
               
                 Volumetric efficiency 
                   
                 83.6% 
                 83.6% 
                 83.7% 
                 83.7% 
                 83.8% 
                 83.8% 
               
               
                 condenser glide 
                 K 
                 0.7 
                 0.7 
                 0.6 
                 0.5 
                 0.5 
                 0.4 
               
               
                 Evaporator glide 
                 K 
                 0.4 
                 0.4 
                 0.3 
                 0.3 
                 0.2 
                 0.2 
               
               
                 Evaporator inlet 
                 ° C. 
                 −0.2 
                 −0.2 
                 −0.2 
                 −0.1 
                 −0.1 
                 −0.1 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 54.6 
                 54.7 
                 54.7 
                 54.7 
                 54.8 
                 54.8 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 14.52 
                 14.76 
                 14.99 
                 15.21 
                 15.41 
                 15.60 
               
               
                 Evaporator pressure 
                 bar 
                 2.56 
                 2.60 
                 2.64 
                 2.68 
                 2.72 
                 2.75 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 122.31 
                 122.87 
                 123.49 
                 124.16 
                 124.90 
                 125.71 
               
               
                 COP 
                   
                 2.04 
                 2.04 
                 2.04 
                 2.04 
                 2.04 
                 2.04 
               
               
                 Discharge temperature 
                 ° C. 
                 93.60 
                 94.16 
                 94.73 
                 95.31 
                 95.91 
                 96.52 
               
               
                 Mass flow rate 
                 kg/hr 
                 176.60 
                 175.79 
                 174.91 
                 173.97 
                 172.94 
                 171.82 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 15.21 
                 14.95 
                 14.71 
                 14.49 
                 14.29 
                 14.10 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1420 
                 1445 
                 1468 
                 1491 
                 1512 
                 1532 
               
               
                 Pressure drop 
                 kPa/m 
                 1111 
                 1089 
                 1067 
                 1047 
                 1028 
                 1009 
               
               
                 GWP (TAR BASIS) 
                   
                 343 
                 408 
                 473 
                 537 
                 602 
                 667 
               
               
                 F/(F + H) 
                   
                 0.605 
                 0.605 
                 0.605 
                 0.606 
                 0.606 
                 0.606 
               
               
                 Capacity relative to 
                   
                 92.2% 
                 93.8% 
                 95.4% 
                 96.8% 
                 98.2% 
                 99.5% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 106.5% 
                 106.5% 
                 106.5% 
                 106.5% 
                 106.5% 
                 106.5% 
               
               
                 Relative pressure drop 
                   
                 89.7% 
                 87.9% 
                 86.1% 
                 84.5% 
                 82.9% 
                 81.4% 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 3 
               
               
                   
               
               
                 Theoretical Performance Data of Selected R-152a/R-1234ze(E)/R-134a Blends 
               
               
                 containing 13% b/w R-152a 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                 13 
                 13 
                 13 
               
               
                 R-134a (% b/w) 
                 10 
                 15 
                 20 
               
               
                 R-1234ze(E) (% b/w) 
                 77 
                 72 
                 67 
               
               
                   
               
             
          
           
               
                   
                 COMPARATIVE DATA 
                   
               
             
          
           
               
                 Calculation results 
                   
                 134a 
                 R1234yf 
                 R1234ze(E) 
                 13/10/77 
                 13/15/72 
                 13/20/67 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.79 
                 5.24 
                 5.75 
                 5.69 
                 5.69 
                 5.68 
               
               
                 Volumetric efficiency 
                   
                 83.6% 
                 84.7% 
                 82.8% 
                 83.4% 
                 83.5% 
                 83.5% 
               
               
                 condenser glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.6 
                 0.7 
                 0.7 
               
               
                 Evaporator glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.4 
                 0.4 
                 0.4 
               
               
                 Evaporator inlet 
                 ° C. 
                 0.0 
                 0.0 
                 0.0 
                 −0.2 
                 −0.2 
                 −0.2 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 55.0 
                 55.0 
                 55.0 
                 54.7 
                 54.7 
                 54.7 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 16.88 
                 16.46 
                 12.38 
                 13.78 
                 14.05 
                 14.31 
               
               
                 Evaporator pressure 
                 bar 
                 2.92 
                 3.14 
                 2.15 
                 2.42 
                 2.47 
                 2.52 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 123.76 
                 94.99 
                 108.63 
                 121.78 
                 122.26 
                 122.76 
               
               
                 COP 
                   
                 2.03 
                 1.91 
                 2.01 
                 2.04 
                 2.04 
                 2.04 
               
               
                 Discharge temperature 
                 ° C. 
                 99.15 
                 92.88 
                 86.66 
                 92.26 
                 92.81 
                 93.37 
               
               
                 Mass flow rate 
                 kg/hr 
                 174.53 
                 227.39 
                 198.83 
                 177.37 
                 176.67 
                 175.95 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 13.16 
                 14.03 
                 18.29 
                 16.01 
                 15.70 
                 15.41 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1641 
                 1540 
                 1181 
                 1349 
                 1376 
                 1402 
               
               
                 Pressure drop 
                 kPa/m 
                 953 
                 1239 
                 1461 
                 1174 
                 1148 
                 1123 
               
               
                 GWP (TAR BASIS) 
                   
                   
                   
                 6 
                 150 
                 215 
                 280 
               
               
                 F/(F + H) 
                   
                   
                   
                 0.667 
                 0.599 
                 0.599 
                 0.600 
               
               
                 Capacity relative to 
                   
                 106.6% 
                 100.0% 
                 76.7% 
                 87.6% 
                 89.3% 
                 91.0% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 106.0% 
                 100.0% 
                 105.3% 
                 106.8% 
                 106.7% 
                 106.7% 
               
               
                 Relative pressure drop 
                   
                 76.9% 
                 100.0% 
                 117.9% 
                 94.7% 
                 92.6% 
                 90.6% 
               
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                   
                 13 
                 13 
                 13 
                 13 
                 13 
                 13 
               
               
                 R-134a (% b/w) 
                   
                 25 
                 30 
                 35 
                 40 
                 45 
                 50 
               
               
                 R-1234ze(E) (% b/w) 
                   
                 62 
                 57 
                 52 
                 47 
                 42 
                 37 
               
               
                   
               
               
                 Calculation results 
                   
                 13/25/62 
                 13/30/57 
                 13/35/52 
                 13/40/47 
                 13/45/42 
                 13/50/37 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.67 
                 5.67 
                 5.67 
                 5.67 
                 5.67 
                 5.67 
               
               
                 Volumetric efficiency 
                   
                 83.6% 
                 83.7% 
                 83.7% 
                 83.8% 
                 83.8% 
                 83.8% 
               
               
                 condenser glide 
                 K 
                 0.7 
                 0.6 
                 0.6 
                 0.5 
                 0.4 
                 0.4 
               
               
                 Evaporator glide 
                 K 
                 0.4 
                 0.4 
                 0.3 
                 0.3 
                 0.2 
                 0.2 
               
               
                 Evaporator inlet 
                 ° C. 
                 −0.2 
                 −0.2 
                 −0.2 
                 −0.1 
                 −0.1 
                 −0.1 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 54.7 
                 54.7 
                 54.7 
                 54.7 
                 54.8 
                 54.8 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 14.56 
                 14.79 
                 15.02 
                 15.23 
                 15.43 
                 15.62 
               
               
                 Evaporator pressure 
                 bar 
                 2.57 
                 2.61 
                 2.65 
                 2.69 
                 2.72 
                 2.75 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 123.30 
                 123.88 
                 124.51 
                 125.20 
                 125.96 
                 126.79 
               
               
                 COP 
                   
                 2.04 
                 2.04 
                 2.04 
                 2.04 
                 2.04 
                 2.04 
               
               
                 Discharge temperature 
                 ° C. 
                 93.93 
                 94.49 
                 95.06 
                 95.65 
                 96.24 
                 96.86 
               
               
                 Mass flow rate 
                 kg/hr 
                 175.18 
                 174.36 
                 173.48 
                 172.52 
                 171.49 
                 170.36 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 15.14 
                 14.89 
                 14.65 
                 14.44 
                 14.24 
                 14.05 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1427 
                 1451 
                 1474 
                 1496 
                 1517 
                 1537 
               
               
                 Pressure drop 
                 kPa/m 
                 1100 
                 1078 
                 1057 
                 1037 
                 1018 
                 999 
               
               
                 GWP (TAR BASIS) 
                   
                 344 
                 409 
                 474 
                 538 
                 603 
                 668 
               
               
                 F/(F + H) 
                   
                 0.600 
                 0.600 
                 0.601 
                 0.601 
                 0.601 
                 0.602 
               
               
                 Capacity relative to 
                   
                 92.7% 
                 94.2% 
                 95.7% 
                 97.2% 
                 98.5% 
                 99.8% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 106.6% 
                 106.6% 
                 106.6% 
                 106.6% 
                 106.6% 
                 106.6% 
               
               
                 Relative pressure drop 
                   
                 88.8% 
                 87.0% 
                 85.3% 
                 83.7% 
                 82.1% 
                 80.7% 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 4 
               
               
                   
               
               
                 Theoretical Performance Data of Selected R-152a/R-1234ze(E)/R-134a Blends 
               
               
                 containing 14% b/w R-152a 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                 14 
                 14 
                 14 
               
               
                 R-134a (% b/w) 
                 10 
                 15 
                 20 
               
               
                 R-1234ze(E) (% b/w) 
                 76 
                 71 
                 66 
               
               
                   
               
             
          
           
               
                   
                 COMPARATIVE DATA 
                   
               
             
          
           
               
                 Calculation results 
                   
                 134a 
                 R1234yf 
                 R1234ze(E) 
                 14/10/76 
                 14/15/71 
                 14/20/66 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.79 
                 5.24 
                 5.75 
                 5.69 
                 5.68 
                 5.68 
               
               
                 Volumetric efficiency 
                   
                 83.6% 
                 84.7% 
                 82.8% 
                 83.5% 
                 83.5% 
                 83.6% 
               
               
                 condenser glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.6 
                 0.7 
                 0.7 
               
               
                 Evaporator glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.4 
                 0.4 
                 0.4 
               
               
                 Evaporator inlet 
                 ° C. 
                 0.0 
                 0.0 
                 0.0 
                 −0.2 
                 −0.2 
                 −0.2 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 55.0 
                 55.0 
                 55.0 
                 54.7 
                 54.7 
                 54.7 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 16.88 
                 16.46 
                 12.38 
                 13.83 
                 14.10 
                 14.35 
               
               
                 Evaporator pressure 
                 bar 
                 2.92 
                 3.14 
                 2.15 
                 2.43 
                 2.48 
                 2.53 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 123.76 
                 94.99 
                 108.63 
                 122.74 
                 123.23 
                 123.75 
               
               
                 COP 
                   
                 2.03 
                 1.91 
                 2.01 
                 2.04 
                 2.04 
                 2.04 
               
               
                 Discharge temperature 
                 ° C. 
                 99.15 
                 92.88 
                 86.66 
                 92.58 
                 93.14 
                 93.69 
               
               
                 Mass flow rate 
                 kg/hr 
                 174.53 
                 227.39 
                 198.83 
                 175.98 
                 175.28 
                 174.55 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 13.16 
                 14.03 
                 18.29 
                 15.93 
                 15.62 
                 15.34 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1641 
                 1540 
                 1181 
                 1356 
                 1382 
                 1408 
               
               
                 Pressure drop 
                 kPa/m 
                 953 
                 1239 
                 1461 
                 1161 
                 1135 
                 1111 
               
               
                 GWP (TAR BASIS) 
                   
                   
                   
                 6 
                 151 
                 216 
                 281 
               
               
                 F/(F + H) 
                   
                   
                   
                 0.667 
                 0.594 
                 0.595 
                 0.595 
               
               
                 Capacity relative to 
                   
                 106.6% 
                 100.0% 
                 76.7% 
                 88.1% 
                 89.8% 
                 91.5% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 106.0% 
                 100.0% 
                 105.3% 
                 106.9% 
                 106.8% 
                 106.8% 
               
               
                 Relative pressure drop 
                   
                 76.9% 
                 100.0% 
                 117.9% 
                 93.7% 
                 91.6% 
                 89.7% 
               
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                   
                 14 
                 14 
                 14 
                 14 
                 14 
                 14 
               
               
                 R-134a (% b/w) 
                   
                 25 
                 30 
                 35 
                 40 
                 45 
                 50 
               
               
                 R-1234ze(E) (% b/w) 
                   
                 61 
                 56 
                 51 
                 46 
                 41 
                 36 
               
               
                   
               
               
                 Calculation results 
                   
                 14/25/61 
                 14/30/56 
                 14/35/51 
                 14/40/46 
                 14/45/41 
                 14/50/36 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.67 
                 5.67 
                 5.67 
                 5.67 
                 5.67 
                 5.67 
               
               
                 Volumetric efficiency 
                   
                 83.6% 
                 83.7% 
                 83.7% 
                 83.8% 
                 83.8% 
                 83.9% 
               
               
                 condenser glide 
                 K 
                 0.7 
                 0.6 
                 0.6 
                 0.5 
                 0.4 
                 0.3 
               
               
                 Evaporator glide 
                 K 
                 0.4 
                 0.4 
                 0.3 
                 0.3 
                 0.2 
                 0.2 
               
               
                 Evaporator inlet 
                 ° C. 
                 −0.2 
                 −0.2 
                 −0.2 
                 −0.1 
                 −0.1 
                 −0.1 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 54.7 
                 54.7 
                 54.7 
                 54.8 
                 54.8 
                 54.8 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 14.59 
                 14.82 
                 15.05 
                 15.25 
                 15.45 
                 15.63 
               
               
                 Evaporator pressure 
                 bar 
                 2.57 
                 2.62 
                 2.66 
                 2.69 
                 2.73 
                 2.76 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 124.30 
                 124.89 
                 125.54 
                 126.24 
                 127.02 
                 127.87 
               
               
                 COP 
                   
                 2.04 
                 2.04 
                 2.04 
                 2.04 
                 2.04 
                 2.04 
               
               
                 Discharge temperature 
                 ° C. 
                 94.25 
                 94.82 
                 95.39 
                 95.98 
                 96.58 
                 97.19 
               
               
                 Mass flow rate 
                 kg/hr 
                 173.78 
                 172.95 
                 172.06 
                 171.10 
                 170.05 
                 168.92 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 15.08 
                 14.83 
                 14.60 
                 14.39 
                 14.19 
                 14.01 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1433 
                 1457 
                 1479 
                 1501 
                 1522 
                 1542 
               
               
                 Pressure drop 
                 kPa/m 
                 1088 
                 1067 
                 1046 
                 1027 
                 1008 
                 990 
               
               
                 GWP (TAR BASIS) 
                   
                 345 
                 410 
                 475 
                 540 
                 604 
                 669 
               
               
                 F/(F + H) 
                   
                 0.595 
                 0.596 
                 0.596 
                 0.597 
                 0.597 
                 0.597 
               
               
                 Capacity relative to 
                   
                 93.1% 
                 94.6% 
                 96.1% 
                 97.5% 
                 98.9% 
                 100.1% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 106.8% 
                 106.7% 
                 106.7% 
                 106.7% 
                 106.7% 
                 106.8% 
               
               
                 Relative pressure drop 
                   
                 87.8% 
                 86.1% 
                 84.4% 
                 82.9% 
                 81.4% 
                 79.9% 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 5 
               
               
                   
               
             
             
               
                 Theoretical Performance Data of Selected R-152a/R-1234ze(E)/R-134a Blends containing 
               
               
                 15% b/w R-152a 
               
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                   
                 15 
                 15 
                 15 
               
               
                 R-134a (% b/w) 
                   
                 10 
                 15 
                 20 
               
               
                 R-1234ze(E) (% b/w) 
                   
                 75 
                 70 
                 65 
               
               
                   
               
               
                   
                 COMPARATIVE DATA 
               
             
          
           
               
                 Calculation results 
                   
                 134a 
                 R1234yf 
                 R1234ze(E) 
                 15/10/75 
                 15/15/70 
                 15/20/65 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.79 
                 5.24 
                 5.75 
                 5.69 
                 5.68 
                 5.68 
               
               
                 Volumetric efficiency 
                   
                 83.6% 
                 84.7% 
                 82.8% 
                 83.5% 
                 83.6% 
                 83.6% 
               
               
                 condenser glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.6 
                 0.7 
                 0.7 
               
               
                 Evaporator glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.4 
                 0.4 
                 0.4 
               
               
                 Evaporator inlet 
                 ° C. 
                 0.0 
                 0.0 
                 0.0 
                 −0.2 
                 −0.2 
                 −0.2 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 55.0 
                 55.0 
                 55.0 
                 54.7 
                 54.7 
                 54.7 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 16.88 
                 16.46 
                 12.38 
                 13.88 
                 14.14 
                 14.39 
               
               
                 Evaporator pressure 
                 bar 
                 2.92 
                 3.14 
                 2.15 
                 2.44 
                 2.49 
                 2.54 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 123.76 
                 94.99 
                 108.63 
                 123.71 
                 124.21 
                 124.73 
               
               
                 COP 
                   
                 2.03 
                 1.91 
                 2.01 
                 2.05 
                 2.04 
                 2.04 
               
               
                 Discharge temperature 
                 ° C. 
                 99.15 
                 92.88 
                 86.66 
                 92.91 
                 93.46 
                 94.02 
               
               
                 Mass flow rate 
                 kg/hr 
                 174.53 
                 227.39 
                 198.83 
                 174.60 
                 173.90 
                 173.17 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 13.16 
                 14.03 
                 18.29 
                 15.85 
                 15.55 
                 15.27 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1641 
                 1540 
                 1181 
                 1363 
                 1389 
                 1415 
               
               
                 Pressure drop 
                 kPa/m 
                 953 
                 1239 
                 1461 
                 1148 
                 1123 
                 1099 
               
               
                 GWP (TAR BASIS) 
                   
                   
                   
                 6 
                 153 
                 217 
                 282 
               
               
                 F/(F + H) 
                   
                   
                   
                 0.667 
                 0.590 
                 0.590 
                 0.590 
               
               
                 Capacity relative to 
                   
                 106.6% 
                 100.0% 
                 76.7% 
                 88.5% 
                 90.2% 
                 91.9% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 106.0% 
                 100.0% 
                 105.3% 
                 107.0% 
                 106.9% 
                 106.9% 
               
               
                 Relative pressure drop 
                   
                 76.9% 
                 100.0% 
                 117.9% 
                 92.7% 
                 90.6% 
                 88.7% 
               
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                   
                 15 
                 15 
                 15 
                 15 
                 15 
                 15 
               
               
                 R-134a (% b/w) 
                   
                 25 
                 30 
                 35 
                 40 
                 45 
                 50 
               
               
                 R-1234ze(E) (% b/w) 
                   
                 60 
                 55 
                 50 
                 45 
                 40 
                 35 
               
               
                   
               
               
                 Calculation results 
                   
                 15/25/60 
                 15/30/55 
                 15/35/50 
                 15/40/45 
                 15/45/40 
                 15/50/35 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.67 
                 5.67 
                 5.67 
                 5.67 
                 5.67 
                 5.67 
               
               
                 Volumetric efficiency 
                   
                 83.7% 
                 83.7% 
                 83.8% 
                 83.8% 
                 83.9% 
                 83.9% 
               
               
                 condenser glide 
                 K 
                 0.6 
                 0.6 
                 0.5 
                 0.5 
                 0.4 
                 0.3 
               
               
                 Evaporator glide 
                 K 
                 0.4 
                 0.3 
                 0.3 
                 0.2 
                 0.2 
                 0.1 
               
               
                 Evaporator inlet 
                 ° C. 
                 −0.2 
                 −0.2 
                 −0.1 
                 −0.1 
                 −0.1 
                 −0.1 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 54.7 
                 54.7 
                 54.7 
                 54.8 
                 54.8 
                 54.8 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 14.63 
                 14.86 
                 15.07 
                 15.28 
                 15.47 
                 15.65 
               
               
                 Evaporator pressure 
                 bar 
                 2.58 
                 2.62 
                 2.66 
                 2.70 
                 2.73 
                 2.76 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 125.29 
                 125.90 
                 126.57 
                 127.29 
                 128.09 
                 128.95 
               
               
                 COP 
                   
                 2.04 
                 2.04 
                 2.04 
                 2.04 
                 2.04 
                 2.04 
               
               
                 Discharge temperature 
                 ° C. 
                 94.58 
                 95.15 
                 95.72 
                 96.31 
                 96.91 
                 97.53 
               
               
                 Mass flow rate 
                 kg/hr 
                 172.39 
                 171.56 
                 170.66 
                 169.69 
                 168.64 
                 167.50 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 15.01 
                 14.77 
                 14.55 
                 14.34 
                 14.15 
                 13.97 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1439 
                 1462 
                 1485 
                 1506 
                 1527 
                 1546 
               
               
                 Pressure drop 
                 kPa/m 
                 1077 
                 1056 
                 1036 
                 1017 
                 998 
                 981 
               
               
                 GWP (TAR BASIS) 
                   
                 347 
                 411 
                 476 
                 541 
                 605 
                 670 
               
               
                 F/(F + H) 
                   
                 0.591 
                 0.591 
                 0.592 
                 0.592 
                 0.592 
                 0.593 
               
               
                 Capacity relative to 
                   
                 93.5% 
                 95.0% 
                 96.4% 
                 97.8% 
                 99.2% 
                 100.4% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 106.9% 
                 106.8% 
                 106.8% 
                 106.8% 
                 106.9% 
                 106.9% 
               
               
                 Relative pressure drop 
                   
                 86.9% 
                 85.2% 
                 83.6% 
                 82.1% 
                 80.6% 
                 79.2% 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 6 
               
               
                   
               
             
             
               
                 Performance Data of Selected R-152a/R-1234ze(E)/R-134a Blends containing 16% b/w R-152a 
               
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                   
                 16 
                 16 
                 16 
               
               
                 R-134a (% b/w) 
                   
                 10 
                 15 
                 20 
               
               
                 R-1234ze(E) (% b/w) 
                   
                 74 
                 69 
                 64 
               
               
                   
               
               
                   
                 COMPARATIVE DATA 
               
             
          
           
               
                 Calculation results 
                   
                 134a 
                 R1234yf 
                 R1234ze(E) 
                 16/10/74 
                 16/15/69 
                 16/20/64 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.79 
                 5.24 
                 5.75 
                 5.68 
                 5.68 
                 5.67 
               
               
                 Volumetric efficiency 
                   
                 83.6% 
                 84.7% 
                 82.8% 
                 83.6% 
                 83.6% 
                 83.7% 
               
               
                 condenser glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.6 
                 0.6 
                 0.6 
               
               
                 Evaporator glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.4 
                 0.4 
                 0.4 
               
               
                 Evaporator inlet 
                 ° C. 
                 0.0 
                 0.0 
                 0.0 
                 −0.2 
                 −0.2 
                 −0.2 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 55.0 
                 55.0 
                 55.0 
                 54.7 
                 54.7 
                 54.7 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 16.88 
                 16.46 
                 12.38 
                 13.92 
                 14.18 
                 14.43 
               
               
                 Evaporator pressure 
                 bar 
                 2.92 
                 3.14 
                 2.15 
                 2.45 
                 2.50 
                 2.54 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 123.76 
                 94.99 
                 108.63 
                 124.68 
                 125.18 
                 125.72 
               
               
                 COP 
                   
                 2.03 
                 1.91 
                 2.01 
                 2.05 
                 2.05 
                 2.05 
               
               
                 Discharge temperature 
                 ° C. 
                 99.15 
                 92.88 
                 86.66 
                 93.23 
                 93.79 
                 94.35 
               
               
                 Mass flow rate 
                 kg/hr 
                 174.53 
                 227.39 
                 198.83 
                 173.25 
                 172.55 
                 171.81 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 13.16 
                 14.03 
                 18.29 
                 15.77 
                 15.48 
                 15.20 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1641 
                 1540 
                 1181 
                 1370 
                 1396 
                 1421 
               
               
                 Pressure drop 
                 kPa/m 
                 953 
                 1239 
                 1461 
                 1136 
                 1111 
                 1088 
               
               
                 GWP (TAR BASIS) 
                   
                   
                   
                 6 
                 154 
                 218 
                 283 
               
               
                 F/(F + H) 
                   
                   
                   
                 0.667 
                 0.585 
                 0.585 
                 0.586 
               
               
                 Capacity relative to 
                   
                 106.6% 
                 100.0% 
                 76.7% 
                 89.0% 
                 90.7% 
                 92.3% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 106.0% 
                 100.0% 
                 105.3% 
                 107.1% 
                 107.1% 
                 107.0% 
               
               
                 Relative pressure drop 
                   
                 76.9% 
                 100.0% 
                 117.9% 
                 91.7% 
                 89.7% 
                 87.8% 
               
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                   
                 16 
                 16 
                 16 
                 16 
                 16 
                 16 
               
               
                 R-134a (% b/w) 
                   
                 25 
                 30 
                 35 
                 40 
                 45 
                 50 
               
               
                 R-1234ze(E) (% b/w) 
                   
                 59 
                 54 
                 49 
                 44 
                 39 
                 34 
               
               
                   
               
               
                 Calculation results 
                   
                 16/25/59 
                 16/30/54 
                 16/35/49 
                 16/40/44 
                 16/45/39 
                 16/50/34 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.67 
                 5.67 
                 5.67 
                 5.67 
                 5.67 
                 5.67 
               
               
                 Volumetric efficiency 
                   
                 83.7% 
                 83.8% 
                 83.8% 
                 83.9% 
                 83.9% 
                 83.9% 
               
               
                 condenser glide 
                 K 
                 0.6 
                 0.6 
                 0.5 
                 0.4 
                 0.4 
                 0.3 
               
               
                 Evaporator glide 
                 K 
                 0.4 
                 0.3 
                 0.3 
                 0.2 
                 0.2 
                 0.1 
               
               
                 Evaporator inlet 
                 ° C. 
                 −0.2 
                 −0.2 
                 −0.1 
                 −0.1 
                 −0.1 
                 −0.1 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 54.7 
                 54.7 
                 54.7 
                 54.8 
                 54.8 
                 54.8 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 14.66 
                 14.89 
                 15.10 
                 15.30 
                 15.49 
                 15.67 
               
               
                 Evaporator pressure 
                 bar 
                 2.59 
                 2.63 
                 2.67 
                 2.70 
                 2.73 
                 2.76 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 126.30 
                 126.92 
                 127.60 
                 128.34 
                 129.16 
                 130.04 
               
               
                 COP 
                   
                 2.05 
                 2.05 
                 2.05 
                 2.05 
                 2.05 
                 2.05 
               
               
                 Discharge temperature 
                 ° C. 
                 94.91 
                 95.47 
                 96.05 
                 96.64 
                 97.25 
                 97.87 
               
               
                 Mass flow rate 
                 kg/hr 
                 171.02 
                 170.18 
                 169.28 
                 168.30 
                 167.24 
                 166.10 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 14.95 
                 14.71 
                 14.49 
                 14.29 
                 14.10 
                 13.93 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1445 
                 1468 
                 1490 
                 1512 
                 1532 
                 1551 
               
               
                 Pressure drop 
                 kPa/m 
                 1066 
                 1046 
                 1026 
                 1007 
                 989 
                 972 
               
               
                 GWP (TAR BASIS) 
                   
                 348 
                 412 
                 477 
                 542 
                 607 
                 671 
               
               
                 F/(F + H) 
                   
                 0.586 
                 0.587 
                 0.587 
                 0.588 
                 0.588 
                 0.588 
               
               
                 Capacity relative to 
                   
                 93.8% 
                 95.4% 
                 96.8% 
                 98.2% 
                 99.5% 
                 100.7% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 107.0% 
                 107.0% 
                 107.0% 
                 107.0% 
                 107.0% 
                 107.1% 
               
               
                 Relative pressure drop 
                   
                 86.1% 
                 84.4% 
                 82.8% 
                 81.3% 
                 79.8% 
                 78.5% 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 7 
               
               
                   
               
             
             
               
                 Theoretical Performance Data of Selected R-152a/R-1234ze(E)/R-134a Blends containing 
               
               
                 17% b/w R-152a 
               
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                   
                 17 
                 17 
                 17 
               
               
                 R-134a (% b/w) 
                   
                 10 
                 15 
                 20 
               
               
                 R-1234ze(E) (% b/w) 
                   
                 73 
                 68 
                 63 
               
               
                   
               
               
                   
                 COMPARATIVE DATA 
               
             
          
           
               
                 Calculation results 
                   
                 134a 
                 R1234yf 
                 R1234ze(E) 
                 17/10/73 
                 17/15/68 
                 17/20/63 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.79 
                 5.24 
                 5.75 
                 5.68 
                 5.68 
                 5.67 
               
               
                 Volumetric efficiency 
                   
                 83.6% 
                 84.7% 
                 82.8% 
                 83.6% 
                 83.7% 
                 83.7% 
               
               
                 condenser glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.6 
                 0.6 
                 0.6 
               
               
                 Evaporator glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.4 
                 0.4 
                 0.4 
               
               
                 Evaporator inlet 
                 ° C. 
                 0.0 
                 0.0 
                 0.0 
                 −0.2 
                 −0.2 
                 −0.2 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 55.0 
                 55.0 
                 55.0 
                 54.7 
                 54.7 
                 54.7 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 16.88 
                 16.46 
                 12.38 
                 13.97 
                 14.22 
                 14.46 
               
               
                 Evaporator pressure 
                 bar 
                 2.92 
                 3.14 
                 2.15 
                 2.46 
                 2.51 
                 2.55 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 123.76 
                 94.99 
                 108.63 
                 125.65 
                 126.17 
                 126.71 
               
               
                 COP 
                   
                 2.03 
                 1.91 
                 2.01 
                 2.05 
                 2.05 
                 2.05 
               
               
                 Discharge temperature 
                 ° C. 
                 99.15 
                 92.88 
                 86.66 
                 93.56 
                 94.11 
                 94.67 
               
               
                 Mass flow rate 
                 kg/hr 
                 174.53 
                 227.39 
                 198.83 
                 171.91 
                 171.20 
                 170.46 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 13.16 
                 14.03 
                 18.29 
                 15.69 
                 15.40 
                 15.14 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1641 
                 1540 
                 1181 
                 1377 
                 1402 
                 1427 
               
               
                 Pressure drop 
                 kPa/m 
                 953 
                 1239 
                 1461 
                 1123 
                 1100 
                 1077 
               
               
                 GWP (TAR BASIS) 
                   
                   
                   
                 6 
                 155 
                 219 
                 284 
               
               
                 F/(F + H) 
                   
                   
                   
                 0.667 
                 0.580 
                 0.581 
                 0.581 
               
               
                 Capacity relative to 
                   
                 106.6% 
                 100.0% 
                 76.7% 
                 89.4% 
                 91.1% 
                 92.7% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 106.0% 
                 100.0% 
                 105.3% 
                 107.2% 
                 107.2% 
                 107.1% 
               
               
                 Relative pressure drop 
                   
                 76.9% 
                 100.0% 
                 117.9% 
                 90.7% 
                 88.7% 
                 86.9% 
               
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                   
                 17 
                 17 
                 17 
                 17 
                 17 
                 17 
               
               
                 R-134a (% b/w) 
                   
                 25 
                 30 
                 35 
                 40 
                 45 
                 50 
               
               
                 R-1234ze(E) (% b/w) 
                   
                 58 
                 53 
                 48 
                 43 
                 38 
                 33 
               
               
                   
               
               
                 Calculation results 
                   
                 17/25/58 
                 17/30/53 
                 17/35/48 
                 17/40/43 
                 17/45/38 
                 17/50/33 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.67 
                 5.67 
                 5.66 
                 5.67 
                 5.67 
                 5.68 
               
               
                 Volumetric efficiency 
                   
                 83.8% 
                 83.8% 
                 83.9% 
                 83.9% 
                 83.9% 
                 84.0% 
               
               
                 condenser glide 
                 K 
                 0.6 
                 0.5 
                 0.5 
                 0.4 
                 0.4 
                 0.3 
               
               
                 Evaporator glide 
                 K 
                 0.3 
                 0.3 
                 0.3 
                 0.2 
                 0.2 
                 0.1 
               
               
                 Evaporator inlet 
                 ° C. 
                 −0.2 
                 −0.2 
                 −0.1 
                 −0.1 
                 −0.1 
                 −0.1 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 54.7 
                 54.7 
                 54.8 
                 54.8 
                 54.8 
                 54.9 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 14.69 
                 14.91 
                 15.12 
                 15.32 
                 15.51 
                 15.68 
               
               
                 Evaporator pressure 
                 bar 
                 2.59 
                 2.63 
                 2.67 
                 2.70 
                 2.74 
                 2.76 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 127.30 
                 127.94 
                 128.64 
                 129.40 
                 130.23 
                 131.14 
               
               
                 COP 
                   
                 2.05 
                 2.05 
                 2.05 
                 2.05 
                 2.05 
                 2.05 
               
               
                 Discharge temperature 
                 ° C. 
                 95.23 
                 95.80 
                 96.38 
                 96.97 
                 97.58 
                 98.20 
               
               
                 Mass flow rate 
                 kg/hr 
                 169.67 
                 168.82 
                 167.91 
                 166.92 
                 165.86 
                 164.71 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 14.89 
                 14.66 
                 14.44 
                 14.24 
                 14.06 
                 13.89 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1451 
                 1474 
                 1496 
                 1516 
                 1536 
                 1555 
               
               
                 Pressure drop 
                 kPa/m 
                 1056 
                 1035 
                 1016 
                 998 
                 980 
                 963 
               
               
                 GWP (TAR BASIS) 
                   
                 349 
                 414 
                 478 
                 543 
                 608 
                 672 
               
               
                 F/(F + H) 
                   
                 0.582 
                 0.582 
                 0.583 
                 0.583 
                 0.584 
                 0.584 
               
               
                 Capacity relative to 
                   
                 94.2% 
                 95.7% 
                 97.1% 
                 98.5% 
                 99.8% 
                 101.0% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 107.1% 
                 107.1% 
                 107.1% 
                 107.1% 
                 107.1% 
                 107.2% 
               
               
                 Relative pressure drop 
                   
                 85.2% 
                 83.6% 
                 82.0% 
                 80.5% 
                 79.1% 
                 77.7% 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 8 
               
               
                   
               
             
             
               
                 Theoretical Performance Data of Selected R-152a/R-1234ze(E)/R-134a Blends containing 
               
               
                 18% b/w R-152a 
               
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                   
                 18 
                 18 
                 18 
               
               
                 R-134a (% b/w) 
                   
                 10 
                 15 
                 20 
               
               
                 R-1234ze(E) (% b/w) 
                   
                 72 
                 67 
                 62 
               
               
                   
               
               
                   
                 COMPARATIVE DATA 
               
             
          
           
               
                 Calculation results 
                   
                 134a 
                 R1234yf 
                 R1234ze(E) 
                 18/10/72 
                 18/15/67 
                 18/20/62 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.79 
                 5.24 
                 5.75 
                 5.68 
                 5.67 
                 5.67 
               
               
                 Volumetric efficiency 
                   
                 83.6% 
                 84.7% 
                 82.8% 
                 83.6% 
                 83.7% 
                 83.7% 
               
               
                 condenser glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.6 
                 0.6 
                 0.6 
               
               
                 Evaporator glide 
                 K 
                 0.0 
                 0.0 
                 0.0 
                 0.4 
                 0.4 
                 0.4 
               
               
                 Evaporator inlet 
                 ° C. 
                 0.0 
                 0.0 
                 0.0 
                 −0.2 
                 −0.2 
                 −0.2 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 55.0 
                 55.0 
                 55.0 
                 54.7 
                 54.7 
                 54.7 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 16.88 
                 16.46 
                 12.38 
                 14.01 
                 14.26 
                 14.50 
               
               
                 Evaporator pressure 
                 bar 
                 2.92 
                 3.14 
                 2.15 
                 2.47 
                 2.51 
                 2.56 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 123.76 
                 94.99 
                 108.63 
                 126.62 
                 127.15 
                 127.71 
               
               
                 COP 
                   
                 2.03 
                 1.91 
                 2.01 
                 2.05 
                 2.05 
                 2.05 
               
               
                 Discharge temperature 
                 ° C. 
                 99.15 
                 92.88 
                 86.66 
                 93.88 
                 94.44 
                 94.99 
               
               
                 Mass flow rate 
                 kg/hr 
                 174.53 
                 227.39 
                 198.83 
                 170.59 
                 169.88 
                 169.13 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 13.16 
                 14.03 
                 18.29 
                 15.61 
                 15.33 
                 15.07 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1641 
                 1540 
                 1181 
                 1383 
                 1409 
                 1433 
               
               
                 Pressure drop 
                 kPa/m 
                 953 
                 1239 
                 1461 
                 1112 
                 1088 
                 1066 
               
               
                 GWP (TAR BASIS) 
                   
                   
                   
                 6 
                 156 
                 221 
                 285 
               
               
                 F/(F + H) 
                   
                   
                   
                 0.667 
                 0.576 
                 0.576 
                 0.577 
               
               
                 Capacity relative to 
                   
                 106.6% 
                 100.0% 
                 76.7% 
                 89.8% 
                 91.5% 
                 93.1% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 106.0% 
                 100.0% 
                 105.3% 
                 107.3% 
                 107.3% 
                 107.2% 
               
               
                 Relative pressure drop 
                   
                 76.9% 
                 100.0% 
                 117.9% 
                 89.7% 
                 87.8% 
                 86.0% 
               
               
                   
               
             
          
           
               
                 R-152a (% b/w) 
                   
                 18 
                 18 
                 18 
                 18 
                 18 
                 18 
               
               
                 R-134a (% b/w) 
                   
                 25 
                 30 
                 35 
                 40 
                 45 
                 50 
               
               
                 R-1234ze(E) (% b/w) 
                   
                 57 
                 52 
                 47 
                 42 
                 37 
                 32 
               
               
                   
               
               
                 Calculation results 
                   
                 18/25/57 
                 18/30/52 
                 18/35/47 
                 18/40/42 
                 18/45/37 
                 18/50/32 
               
               
                   
               
               
                 Pressure ratio 
                   
                 5.67 
                 5.66 
                 5.66 
                 5.67 
                 5.67 
                 5.68 
               
               
                 Volumetric efficiency 
                   
                 83.8% 
                 83.8% 
                 83.9% 
                 83.9% 
                 84.0% 
                 84.0% 
               
               
                 condenser glide 
                 K 
                 0.6 
                 0.5 
                 0.5 
                 0.4 
                 0.3 
                 0.3 
               
               
                 Evaporator glide 
                 K 
                 0.3 
                 0.3 
                 0.2 
                 0.2 
                 0.2 
                 0.1 
               
               
                 Evaporator inlet 
                 ° C. 
                 −0.2 
                 −0.1 
                 −0.1 
                 −0.1 
                 −0.1 
                 −0.1 
               
               
                 temperature 
               
               
                 Condenser exit 
                 ° C. 
                 54.7 
                 54.7 
                 54.8 
                 54.8 
                 54.8 
                 54.9 
               
               
                 temperature 
               
               
                 Condenser pressure 
                 bar 
                 14.73 
                 14.94 
                 15.15 
                 15.34 
                 15.52 
                 15.69 
               
               
                 Evaporator pressure 
                 bar 
                 2.60 
                 2.64 
                 2.67 
                 2.71 
                 2.74 
                 2.76 
               
               
                 Refrigeration effect 
                 kJ/kg 
                 128.32 
                 128.97 
                 129.68 
                 130.46 
                 131.31 
                 132.24 
               
               
                 COP 
                   
                 2.05 
                 2.05 
                 2.05 
                 2.05 
                 2.05 
                 2.05 
               
               
                 Discharge temperature 
                 ° C. 
                 95.56 
                 96.13 
                 96.71 
                 97.31 
                 97.91 
                 98.54 
               
               
                 Mass flow rate 
                 kg/hr 
                 168.33 
                 167.48 
                 166.56 
                 165.57 
                 164.50 
                 163.35 
               
               
                 Volumetric flow rate 
                 m 3 /hr 
                 14.83 
                 14.60 
                 14.39 
                 14.20 
                 14.02 
                 13.85 
               
               
                 Volumetric capacity 
                 kJ/m 3   
                 1457 
                 1479 
                 1501 
                 1521 
                 1541 
                 1559 
               
               
                 Pressure drop 
                 kPa/m 
                 1045 
                 1025 
                 1006 
                 988 
                 971 
                 955 
               
               
                 GWP (TAR BASIS) 
                   
                 350 
                 415 
                 479 
                 544 
                 609 
                 674 
               
               
                 F/(F + H) 
                   
                 0.577 
                 0.578 
                 0.578 
                 0.579 
                 0.579 
                 0.580 
               
               
                 Capacity relative to 
                   
                 94.6% 
                 96.1% 
                 97.5% 
                 98.8% 
                 100.1% 
                 101.3% 
               
               
                 1234yf 
               
               
                 Relative COP 
                   
                 107.2% 
                 107.2% 
                 107.2% 
                 107.2% 
                 107.3% 
                 107.3% 
               
               
                 Relative pressure drop 
                   
                 84.4% 
                 82.8% 
                 81.2% 
                 79.8% 
                 78.4% 
                 77.1%