cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.18462/iir.tptpr.2017.0127
title: Influence of Al2O3 nanoparticle additives on the thermophysical properties of aqueous solution of propylene glycol and on the heat transfer coefficient in forced convection flow in a tube.

description: For the moment, coolants that are composed of aqueous solutions of propylene glycol are widely used in chillers. Such coolants have some advantages over brines or ethylene glycol solutions: non-toxicity, low corrosivity, low crystallization temperature. However, aqueous solutions of the propylene glycol have poor heat transfer efficiency in heat exchangers at low temperatures. One of methods to improve the thermophysical properties of the propylene glycol based coolants and also increasing the heat transfer coefficient in forced convection flow in a tube is an addition of the metal or metal oxides nanoparticles. The prospects of nanoparticle additives to coolants for application in refrigeration systems have been studied. The method of preparation of the nanocoolants based on aqueous solutions of propylene glycol and Al2O3 nanoparticles has been considered. The aggregative stability of Al2O3 nanoparticles (0.53 and 1.03 % mass.) in nanocoolant has been investigated. The results of complex experimental investigation of the thermophysical properties of nanocoolant in temperature range 253-313 К are reported. The comparative analysis of thermophysical properties of nanocoolant and base fluid (aqueous solution of propylene glycol) has been carried out. The results of experimental investigation of the heat transfer coefficient in laminar flow forced convection of coolant and nanocoolant in pipe are presented. It was shown that the heat transfer coefficients for various values of the Reynolds number typical for laminar flow for the traditional coolant was generally less than for the nanocoolant.
DOI: 10.18462/iir.tptpr.2017.0128
title: Enthalpy estimation for new working fluid mixtures based on ionic liquids for absorption heat pumps.

description: Enthalpy is a thermodynamic property necessary in every thermal engineering applications such as the design of heat exchangers, power plants, absorption heat pumps and refrigeration, etc. There are different approaches to calculate the enthalpy of mixtures from experimental data. The most apropriate way is to calculate it from experimental data of excess enthalpy and isobaric heat capacity at different temperatures and compositions. However, the excess enthalpy is usually available only at a single temeperature. As alternative, it can be obtained from thermodynamic models such as equations of state and activity coefficient based model, which usually require experimental data of vapor-liquid equilibrium to obtain binary interaction parameters. However, it is well known that the direct calculation of derived properties such as excess enthalpy from experimental data usually leads to significant errors due to thermodynamic inconsistencies. For this reason, accurate data and consistant methods are necessary to obtain suitable results. In this research, first we estimated the excess enthalpy using the Redlich-Kwong-Mathias equation of state and the Non-Two Random Liquids (NRTL) model, and next we compared it with the experimental values. Then, the obtained information was used to determine the effect of this property for the enthalpy calculation. Two ionic-liquid based mixtures, with potential application in absorption heat pumps, have been analyzed: 2,2,2-trifluoroethanol + 1-ethyl-3-methylimidazolium tetrafluoroborate, and water + 1,3-dimethylimidazolium dimethylphosphate.
DOI: 10.18462/iir.tptpr.2017.0129
title: Absorption behaviour and diffusivity of ammonia in ionic liquids.

description: Research on the use ionic liquid as an absorber for natural refrigerant has been significantly progressing in recent years. Having unique characteristics, the working fluids involving natural refrigerant and ionic liquid mixtures, including ammonia/ionic liquid pairs are able to overcome the drawback of conventional working fluids such as crystallization problem and the necessity of rectification process. Some ionic liquids that may be suitable as absorbent for ammonia refrigerant are 1-(2-hydroxyethyl)-3-methylimidazolium tetrafluoroborate ([EtOHmim][BF4]) and 1-(2-hydroxyethyl)-3-methylimidazolium bis(trifluoro-methylsulfonyl)imide ([EtOHmim][NTf2]). These ionic liquids are considered as suitable candidate ionic liquid based absorbent due to their favourable properties and their viability as absorbent for ammonia refrigerant. In this paper, an experimental investigation to study the absorption behaviour and mass diffusivity of ammonia into ionic liquids is reported. This investigation is essential in order to fundamentally identify the absorption performance and characteristic of refrigerant in absorbent before heading to the detail study on heat and mass transfer performance of these working pairs. The ionic liquids studied in this work are combinations of two different cations ([EtOHmim]+ and [emim]+) and anions ([BF4]-, and [NTf2]-). The detail methodology and experimental setup are explained in this paper and measurement parameters of ammonia absorption into ionic liquid are discussed.
DOI: 10.18462/iir.tptpr.2017.1005
title: A new approach to predict void fraction flow, regime and heat transfer accounting for non equilibrium in condensers with superheated inlets.

description: A new approach to predict the void fraction, flow regime and heat transfer in a condenser with superheated inlet by accounting for the effects of non-equilibrium is introduced. The paper presents evidence (by visualization and temperature and heat transfer measurements) of condensation while the specific enthalpy of the bulk flow indicates superheated vapor because of the temperature gradient causing the wall temperature to drop below saturation temperature. The presence of liquid film induces discrepancies between the void fractions, flow regimes and heat transfer coefficients in a real condenser and the predictions from a model assuming thermal equilibrium. The new approach attempts to address this issue by bringing new predictions of void fractions, flow regimes and heat transfer coefficients from thermodynamic quality one and zero to the real onset and end of the condensation. From extensive measurements and flow characterizations based on visualization in diabatic conditions, the new approach of predicting void fraction, flow regime and heat transfer coefficient is specifically explained and validated.
DOI: 10.18462/iir.tptpr.2017.1006
title: Research on heat transfer characteristics of low GWP refrigerants.

description: Due to Montreal protocol and F-gas regulation, low global warming potential (GWP) refrigerants have been studied for replacement of existing refrigerants, such as R-134a, R-410A, and R-404a. In this study, recent research trends on the heat transfer characteristics of low GWP refrigerants are investigated. Low GWP refrigerants of R-1234yf, R-1234ze, R-1233zd, R-32, and CO2 showed several disadvantages such as reduced heat transfer rate, high pressure drop, and unstability, but still had competitive performance compared to the existing refrigerants. The detailed performance of these low GWP refrigerants was compared to that of the existing refrigerants.
DOI: 10.5281/zenodo.838014
title: Anonymized Transcripts Of Change Laboratory Workshops

description: Full transcript in Italian of the Change laboratory workshops in a a secondary vocational secondary institute in the Lombardy region.

The workshops involved an overall number of 37 participants throughout the meetings between humanity teachers, science teachers, technical teachers and workshop assistants. 

Transcripts of 7 workshops (in 2016), 2 follow-up and two department councils (in 2016 and 2017). 

The transcripts have been fully  anonymized.
description: Project 654101 Marie Curie EntreLab
DOI: 10.5281/zenodo.838015
title: Anonymized Transcripts Of Change Laboratory Workshops

description: Full transcript in Italian of the Change laboratory workshops in a a secondary vocational secondary institute in the Lombardy region.

The workshops involved an overall number of 37 participants throughout the meetings between humanity teachers, science teachers, technical teachers and workshop assistants. 

Transcripts of 7 workshops (in 2016), 2 follow-up and two department councils (in 2016 and 2017). 

The transcripts have been fully  anonymized.
description: Project 654101 Marie Curie EntreLab
DOI: 10.18462/iir.tptpr.2017.0023
title: R133zd(E) flow boiling inside a 4.3mm ID microfin tube.

description: This paper explores the heat transfer and fluid flow characteristics of a new low-GWP refrigerant R1233zd(E) during flow boiling inside a mini microfin tube with internal diameter at the fin tip of 4.3 mm. The microfin tube is brazed inside a copper plate, electrically heated from the bottom. Several T-type thermocouples are inserted in the wall to measure the temperature distribution during the phase change process. In particular, the experimental measurements were carried out at constant mean saturation temperature of 30°C, by varying the refrigerant mass velocity between 100 kg m-2 s-1 and 300 kg m-2 s-1, the vapor quality from 0.2 to 0.95, at four different heat fluxes: 15, 30, 60, and 90 kW m-2. The experimental results are presented in terms of the two-phase
heat transfer coefficient, onset of dryout vapor quality, and frictional pressure drop as a function of the operating test conditions.
DOI: 10.18462/iir.tptpr.2017.0026
title: Development of a continuous empirical correlation for non adiabatic capillary tube using R-600A and R-134A as refrigerants.

description: A capillary tube-suction line heat exchanger (CT-SLHX) is widely used as a refrigerant expansion device in small sized refrigeration and air-conditioning systems, which enhances the refrigeration capacity and ensures that a superheated vapor of refrigerant enters the compressor. To calculate mass flow rate in a capillary tube, it is necessary to develop an accurate non-adiabatic capillary tube model. In the present study, conservation laws in a one dimension was used to generate reference data. An empirical model which is continuous at saturated liquid point is developed for both subcooled and two-phase capillary tube inlet conditions with introduction of new dimensionless π parameters. Wide ranges of capillary tube inner diameter, capillary total length, capillary inlet quality or subcooling temperature, heat exchanger length, suction line diameter, capillary inlet pressure, evaporator inlet temperature, superheating temperature and refrigerant type are used in the process of data generation. The new model shows a good agreement with experimental data.
DOI: 10.18462/iir.tptpr.2017.0035
title: Experimental investigation of an absorption refrigerator working with ionic liquid and ethanol.

description: Electrically-driven vapor compression or thermally-driven ammonia water absorption refrigeration systems are commonly used for cooling below 0°C. Due to the non-negligible vapor pressure of water, usually a rectification during regeneration is required for the ammonia water system. Ionic liquids (IL) present an alternative to conventional working pairs. Ionic liquids are versatile absorbents since they extend the use of natural refrigerants other than ammonia in thermally driven absorption technology. Furthermore, room temperature ionic liquids do not crystallize at ambient temperature even at high ionic liquid mass fractions just like water in ammonia water chillers. In addition, they exhibit a nearly zero vapor pressure allowing for regeneration without rectification.
In the present paper, the first experimental results of a single stage absorption refrigerator using ethanol as the refrigerant and the ionic liquid [EMIM][DEP] as the absorbent are presented. For 10°C and 30°C as external evaporator and absorber inlet temperatures the experimental thermal efficiency (COP) ranges from 0.4 to 0.62 and the refrigeration power from 0.7 to 1.9kW for varying driving temperatures from 66°C to 110°C. The simulated thermal efficiency is rather high with 0.75. This discrepancy to the experiment most likely is due to a thermal loss in the experiment.
DOI: 10.18462/iir.tptpr.2017.0036
title: Experimental investigation of an internally-cooled open sorption system for air dehumidification using ionic liquids.

description: Open sorption systems are typically operated with aqueous inorganic solutions such as lithium chloride (LiCl). These absorbents, however, are limited in their dehumidification capacity by their crystallization limit and usually exhibit disadvantageous corrosion properties. In contrast, some aqueous solutions of so-called ionic liquids (IL) show low water vapor pressures and usually do not corrode stainless steel. An internally-cooled open absorption system for air dehumidification using the ionic liquid IL4 has been experimentally investigated. The influence of the regeneration temperature, the heat rejection temperature and the ambient humidity on the dehumidification and the thermal efficiency of the system has been analyzed. In the experiments it is investigated whether the targeted dew point temperature of -20°C is achieved independently of the ambient moisture. In a first set of experiments, the cooling temperature was set constant to 30°C and the driving temperature was set to 85°C and 105°C while the ambient humidity was varied. In a second set of experiments, the driving temperature was set constant to 85°C and the cooling temperature was set to 21°C, 25°C, 30°C and 35°C. In both experiments, the volumetric air flow rate in the absorber and in the desorber was approximately 630m3/h and the ambient air temperature was 28°C. The transfer area of the absober was 12 m2 and of the desorber 6 m2. In comparison to the experiments with LiCl reported in literature at comparable conditions, the system using IL4 exhibited lower absolute humidities at the absorber outlet air (larger dehumidification). The target humidity of 0.7gv/kga was reached at ambient humidites below 8gv/kga. High regeneration temperatures and low cooling temperatures led to larger dehumidification for a given ambient humidity due to largerdriving partial pressure differences. However, the thermal efficiency deteriorates with increasing regeneration temperature due to larger thermal losses.
DOI: 10.18462/iir.tptpr.2017.0043
title: Boiling heat transfer characteristics of R32 in small channel.

description: This study reports the two-phase flow boiling heat transfer coefficient of R32 in minichannel. The experimental data were conducted in horizontal stainless steel tubes with the inner diameter of 1.5 mm. The testing conditions were conducted with the mass fluxes range from 300 to 500 kg/m2s, the heat fluxes from 5 to 15 kW/m2, the saturation temperature of 10°C and 15°C the vapor quality from 0.1 to dry-out. The effects of mass flux, heat flux and saturation temperature on the heat transfer coefficient were analyzed. The experimental data were also compared with some well-known heat transfer coefficient correlations and the new correlation was developed using the present experimental data.
DOI: 10.18462/iir.tptpr.2017.0045
title: Experimental study on region-control method for a heat pump-thermal storage heating system.

description: A heat pump-thermal storage system stores thermal energy from a heat pump by using inexpensive electricity that is available at midnight. The utilization of midnight electricity increases with increases in thermal storage usage, and this decreases heat pump efficiency owing to low part load operation. In addition, increased usage of the heat pump enhances energy efficiency of the heat pump system in conjunction with a decrease in midnight electricity utilization. Hence, an optimal control strategy is required to efficiently operate thermal storages and heat pumps during daytime. The region control method assigns a load sharing ratio of heat pump and thermal storage based on variations in heating load. A thermal storage is mostly in charge of the heating load under a low load condition. With respect to medium heating load condition, a heat pump operates efficiently, and this decreases energy consumption and operating cost. In this study, a heat pump and a thermal storage priority method were compared with a region-control method, and an experiment was performed. The results indicated that when compared with the thermal storage priority method, the region-control method had 7% less thermal storage usage but it had 5% less energy consumption as it had a higher PLR of the heat pump. When compared with the heat pump priority method, the region-control method had 32% higher thermal storage usage in addition to 15% lower energy consumption because of optimized heat pump operations. With respect to operating cost, the region-control method corresponded to 6% and 8% lower operation costs when compared with the thermal storage and heat pump priority methods. Thus, it was concluded that the region-control method was more efficient than conventional methods.
DOI: 10.18462/iir.tptpr.2017.0081
title: Simulation of thermal compression with activated carbon-ethanol pair.

description: Adsorption refrigeration systems use thermal compression to perform a heat pump cycle. The pressure of refrigerant is raised by desorption process, and the refrigerant is sent to condenser, where the refrigerant is liquified at higher pressure and temperature than those in evaporator. Although the thermal compression process is essential to the performance of adsorption refrigeration systems and to the design optimization of an adsorber, the process is not modeled accurately in many of conventional adsorption refrigerator models. Therefore, in this study, a detailed simulation model of thermal compression process was built and the influence of adsorber design on the process was investigated. The simulation model was worthy not only for the analysis of adsorption refrigeration system but also for other applications of thermal compression such as thermal pumping and heat engine cycles.
DOI: 10.18462/iir.tptpr.2017.0089
title: Icing behavior of super-cooled condensate on hydrophilic and super-hydrophobic surfaces.

description: The present study investigates experimentally the frosting characteristics of super-cooled condensate on hydrophilic and super-hydrophobic surfaces under various environmental conditions. In particular, the frosting mechanism related to the delay of icing is analyzed for three different surfaces, such as different equilibrium contact angles of 74° (bare copper), 135° (thin polymer layer coated copper), and 154° (SAM-coated nano-structured copper). The experiments were carried out under the well-controlled conditions with the surface temperature ranging from -4°C to -8°C, the relative humidity of 60%, and the air temperature of 24°C. During the frosting process, images of frosting behavior were obtained in situ by connecting CMOS camera. From the results, it was found that the frosting behavior was significantly affected by the surface wettability because of the variation of surface energy. In the case of a hydrophilic surface, fast freezing was observed in the early stage of the frosting process, and the frost crystals were rapidly formed on the whole surface. On the other hand, in the case of a hydrophobic surface, dropwise condensation occurred at the early cooling stage, and some condensates were still in the super-cooled state. Moreover, a small number of frozen droplets randomly formed on the surface were strongly interacted with supercooled condensates, especially causing the evaporation of the supercooled droplet which affected the frost propagation.
DOI: 10.18462/iir.tptpr.2017.0125
title: Modelling the thermodynamics mixtures of N2, O2, and Ar. The state-of-the-art of available models.

description: The optimal design of cryogenic systems for the separation of species that compose the air, mainly N2, O2 and Ar, has become a focus of attention in the development of low-CO2 emissions systems for the production of electrical energy and/or energy vectors, such as hydrogen. The pivotal action to optimize these processes and to reduce uncertainties related to the competitiveness with other separation technologies is the application of models that accurately reproduce thermodynamic and transport properties of mixtures of N2, Ar and O2. The purpose of this work is to analyse the available thermodynamic models considered as the most suitable for these systems. This paper compares the accuracy of two multi-parameter models (GERG-2008 and Bender) and of the Peng-Robinson equation-of-state, assessing their capability in calculating phase-equilibrium properties, density, enthalpic and volumetric properties change due to mixing. Moreover, it is shown the impact of inaccurate density calculations on the determination of transport properties.
DOI: 10.6073/pasta/0b280f0012bf601f94171892d84328a2
title: Nitrate uptake estimates phytoplankton incorporation of dissolved NO3- at selected depths from CCE LTER process cruises in the California Current System, 2011 – 2016 (ongoing).
DOI: 10.6073/pasta/a8ffd6f7cf1f0286c54f5cf0e6dcaf61
title: Size fractionation for total Chl a within the surface layer and calculated size distribution of total Chl a from discrete bottle samples collected during CCE LTER process cruises in the CCE region, 2006 - 2016 (ongoing).
DOI: 10.6073/pasta/bf0d0c882883135f4c400d36929f46c3
title: Water column primary production per day integrated over the euphotic zone from CCE LTER process cruises in the California Current System, 2006 - 2016 (ongoing).
DOI: 10.15468/adiir0
title: Naturalis Biodiversity Center (NL) - Mammalia

description: Database contains specimen records from the Mammalia collection of the Naturalis Biodiversity Center (Leiden, Netherlands). The zoological specimens come from the National Museum of Natural History (RMNH; Rijksmuseum voor Natuurlijke Historie), later National Museum of Natural History, Naturalis in Leiden and the Zoological Museum Amsterdam (ZMA) and new acquisitions. This database replaces the dataset "Zoological Museum Amsterdam, University of Amsterdam (NL) – Mammalia" which was hosted earlier on the GBIF dataportal and contains many new and updated records, especially from the RMNH collection. The old registration numbers of the former institutions (RMNH, ZMA) are also mentioned in the dataset.
DOI: 10.24388/g00000001psr
title: Experimental and theoretical combustion data based on the article Le Cong, T., Dagaut,P., Energy and Fuels, 2009, (23), (1), 725-734., Fig. 1. H2 open diamond, H2O open circle

description: Initial composition: H2 O2 N2
DOI: 10.24388/g00000001_x
title: Experimental and theoretical combustion data based on the article Chaumeix, N., Pichon, S., Lafosse, F., Paillard, C.-E., International Journal of Hydrogen Energy, 2007, (32) 2216-2226, Fig. 12., left, open diamond

description: Initial composition: H2 O2 Ar
DOI: 10.17632/xs9kyk22kr.1
title: Data for: Assessment of the physical quality of a Fluvisol in the Brazilian semiarid region

description: A dataset of some soil physics properties from a Fluvisol located in semi-arid region of Brazil. Most of the properties were obtained using Beerkan method.