### . 

# . 

# . , 

# 1986 STANDARD 

# for

!!p;



# ...I'.

AIR-CONDITIONING & 

## REFRIGERATION INSTITUTE**~~-l ":':'-'** **~** - ..'

. "**i\i'~Y ~**  . _. I ."'V-,\

-



### ,.... 84-01 

## ,--AM-ERIC-AN-NATI-ON

.......... Al STANDARD

- ANSI/ARI 360-86



# COMMERCIAL AND

.. INDUSTRIAL UNITARY AIR-CONDITIONING EQUIPMENT 

# I Standard 360 

# I

1501 WILSON BOULEVARD • ARLINGTON, VIRGINIA 22209



## ..__----- .- ' "

----::.:::t "



## .., 

### .... 

### oTABLE OF CONTENTS PAGE PART Section 1. Purpose ...................................................................................................................................................... Section 2. Scope

............................................................................ . Section 3. Definitions

.............. ····················································· . '

.... . Section 4. Classification

... ;............... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Section 5. Testing and Rating Requirements

.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Section 6. Performance Requirements

.......................................................... 6 Section 7. Safety Recommendations

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7 Section 8. Conformance

....................................... ································· 7 Appendix A Alternate Test Method

...................................,. . . . . . .. . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . 7 Appendix B Method of Calculating IPL V

...........;......................................................... 9**~y** 

### 12 

## 1993 r:jAY 24 

## 199:**~\PR** 1 0 

### !l95

,**.~p;. ~**  

### r**t-~3** 

# I

I I

, 

### Date Due**~**-CondttlOlling and Refrigeration Institute KEH-411 11-84' PrIIenI and Tradefnatl( OffICff

### 36 0-86 

# COMMERCIAL AND IND**~** 

# IAL UNITARY AIR-CONDITIONING EQUIPMENT

Section 1

. Purpose 

### 1.1 Purpose. The purpose of this standard is to establish, for commercial and industrial unitary air-conditioning equipment: definitions and classification; requirements for testing and rating; specifications, literature and advertising requirements; performance requirements; safety recommendations; and conformance conditions

. 1.1.1 This standard is intended for the guidance of the industry, including manufacturers, distributors, engineers, contractors, and consumers. 

### 1.2 ReviewandAmendment

. This standard is subject to review and amendment as the art of the industry advances. Section 2. Scope 

### 2.1 Scope. This standard applies to factory-made commercial and industrial air

-conditioners defined in 3.l. 

### 2.1.1 Energy Source. This standard applies only to electrically-driven, mechanical compression type systems
. 

### 2.2 Exclusions. This standard does not apply to the rating and testing ofindividual assemblies, such as condensing units or coils. for separate use. 2.2.1 This standarddoes not include standards for heating equipment or for the heating function of commercial andindustrial unitary air-conditioning equipment. 2.2.2 This standard does not apply to unitary airconditioners, as defined in ARIStandard210,with capacities less than 135.000 Btuh, [40 kw], or to unitary heat-operated air-conditioning equipment, or to heat pumps, or**t~** variable air volume units. Section 3. Definitions 

### 3.1 Commercial and Industrial Unitary AirConditioner. A commercial and industrial unitary airconditioner consists of one or more factory-made assemblieswhich include an evaporatororcooling coil and air moving device. a compressor and condenser combination. and may include a heating function as well. Where such equipment is provided in more than one assembly. the separatedassemblies are to be designed to be used together. and the requirements of rating outlined in this standard are based upon the use ofmatched assemblies. 

### 3.1.1 Functions. The functions ofcommercial and industrial unitary air-conditioners, e'ither alone or in combination with a heating plant, are to provide air-circulation, air-cleaning, cooling with controlled temperature, and dehumidification, and may optionally include the functions of heating and humidifying. 

### 3.2 Energy Efficiency Ratio (EER). A ratio calculated ' by dividing the net cooling capacity in MBh by the total power input in kw at any given set of rating conditions, expressed in Btuh per watt (Btuh/watt). 

### 3.2.1 Standard Energy Efficiency Ratio. A ratio calculated from the capacity and power input values obtained at Standard Rating Conditions. 

### 3.3 Coefficient ofPerformance (COP). A. ratio calculated by dividing the net cooling capacity provided, (MBh) by the total power input (kw) x 3.413

. 

### 3.3.1 Standard Coefficient of Performance. A ratio calculated from the capacity and powerinput values (obtained in accordance with 3

.5) at Standard Rating Conditions. 

### 3.4 Integrated Part Load Value (IPLV). A single num-' ber part load efficiency figure of merit calculated per the method described in 5

.2.2

. 

### 3.5 Published Rating. A statement ofthe assigned values of those performance characteristics, under stated rating conditions, by which a unit may be chosen to fit its application. These values apply to all units of like nominal**siz~** and type (identification) produced by the same manufacturer. As used herein, the term "published rating" includes the rating of all performance characteristics shown on the air-conditioner or published in specifications, advertising, or other literature controlled by the manufacturer, at stated rating conditions. 

### 3-:5.1 StandardRating. A rating based ontestsperformed at Standard Rating Conditions. 

### 3.5.2 Application Rating. A rating based on tests performed at application rating conditions (other than Standard Rating Conditions)

. 

### 3.6 Rating Conditions. Any set of operating conditions under which a single level of performance results, and which causes only that level ofperformance ofoccur. 

### 1

# ~~**:~~DARD** 360_86

______

# ~~~~-f----------------------------------**~'$T. ,.** **,.** • .

## '

# . ';:'**'-** 3:6.1 Standard Rating Conditions.. Rating condi-**~~:: '=** **:"**

## qonS used-as**t~e.**basis of'companson of perform-**~ ",** .. :",.!. •ancc charactenstlcs.**:' ~~** **~** .. , .**~; :·r!"'Sh;Ur.**  "Should", "Recommended", or "ItIs Rec

## I-**'**

## . .- J d" "Shall" "should" "recommended" or



### . ...-.....**omm~nue** 

### . " ,**~~ ~**  

### ··it is recommended" shall be interpreted 

### as follows:


### :::**.~, .**  

### . -- .... 3.7.1 Shall. Where "shall" or "shall not" is used

. for a provision specified, that provision is mandatory ifcompliance with the standard is claimed. 

### 3.7.2 Should, Recommended, or It Is Recommended. "Should", "recommended", or "itis rec-

. ommended" is used to indicate provisions which

are not mandatory but which are desirable as good practice. Section 4. Classification 4.1 Classification. Normally, commercial and industriai unitaryair-conditionerswithin the scope ofthis standard can be classified as Shown in Table 1. Table 1 - Classification of Equipment Types or Commercial and Industrial Unitary Air-Conditioners ARI Heat Designation Type Rejection Arrangement Single Pack- SP-A Air

## I~~~p 

# I**gg~J51**

age SP-E Evap Cond SP-W Water Year-Round SPY-A Air

# ~~tlI2g~~1 Single SPY-E Evap Cond Package f?PY-W Water Condensing RCU-A-CB Air

# I~~fil 

# mI

Unit, Coil RCU-E-CB Evap Cond and Blower RCU-W-CB Water Year-Round RCUY-A-CB Air

# liit~m Condensing RCUY-E-CB Evap Cond Unit, Coil RCUY-W-CB Water and Blower Remote RC-A Air

# ~ ICONDI

Condenser RC-E Evap Cond RC-W Water Year-Round RCY-A Air

Remote RCY-E Evap Cond

# III~ Condenser RCY-W Water EA
Extracted by permission from Table 1. Chapter 42. 1979 ASHRAE Handbook.
Section 5. Testing and Rating Requirements 5.1 StandardRatings. Standard Ratings shall be established at the Standard Rating Conditions specified in 5.1.3. All Standard Ratings shall be verified by tests conducted in accordance with ASHRAE Standard Methods o/Testing forRating UnitaryAir-Conditioning and Heat Pump Equipment (The American Society of Heating, Refrigerating and Air-Conditioning En2 gineers, Inc. Standard 37-78),and with the testmethods and procedures as described in lliis standard. Standard Cooling Capacity shall be stated as total (sensible plus latent) cooling capacity and sensible cooling capacity and shall be net values, reflecting the effects of circulating-fanheat.Powerinputshallbethe totalpower input to the compressor(s) and fanes) plus controls and other items included 

### as part ofthe model number(s). 5.1.1 Values o/Standard Capacity Ratings. These ratings shall be ' expressed only in terms of thousands ofBtuperhour (MBh) in multiples of2 MBh [0.6 kw] for units with standard ratings of 400 MBh [117 kw] and under. Forunits with standardratings'ofover400MBh [117 kw], theratings shall be expressed in

.multiples of5 MBh [1.5 kw] 5.1.2 Values ofStandard Efficiency Ratings. Energy Efficiency Ratios (EER) in Btuhlwatt shall be expressed in multiples tottie nearest 0.1 

### atuhl watt. Integrated Part Load Values (IPL V) and coefficient of performance (COP), 

### if used, they shall be expressed in multiples to the nearest 0.1. 5.1.3 StandardRating Conditions. The conditions of test for Standard Ratings shall include the following:

5.1.3.1 StandardRating Temperatures. For all units Air temperature entering indoor portion ofunit

.............80 F [26.7 DC] dry bulb 67 F [19.4 DC] wet bulb Air temperature surrounding unit

.................95 F[35 DC]dry bulb· For air-cooled units Air temperature entering outdoor portion ofunit

.............. 95 F [35 DC] dry bulb (and 75 F [23.9 C]wet bulb when condensate is rejected to tire airstream) For evaporatively-cooled units Air temperature entering outdoor portion ofunit

........ : ......95 F [35 DC] dry bulb 75 F[23.9 DC] wet bulb For water-cooled units Water temperature entering

condenser

..................85 F [29.4DC] Water temperature leaving**con~~nser** ....•......•....... _.95 F [35 DC] °For units or portions thereofintended to be installed only indoors. this temp'eratuTe may be reduced to 80 F [26.7°C] dry bulb.

.--------------__________ ARI STANDARD 

### 360-86
5.1.3.2 Voltage and Frequency. Recommended nameplate voltages for 60 Hertz systems are one or more of the following utilization voltages: 200.230.460.575. Standard Rating tests shall be performed at the nameplate rated voltage**~nd** frequency. For air-conditioners with dual nameplate voltage ratings. Standard Rating tests shall be performed at both voltages. or at the lower of the two voltages. ifonly a single Standard Rating is to be published. 5.1.3.3 Cooling Coil Air Quantity. ,All Standard Ratings shall be determined at a cooling coil air quantity. delivered against at least the minimum external resistance required by 5.1.3.6. as outlined below. 100 percent recirculated air will be used except when the optional rating with outside airis claimed. (See 5.1.4) For units equipped for multizone ordual duct operation. the hot deck shall be closed off. All air quantities shall be expressed as cfm [Us] of Standard Air (density 0.075 Ib per cu ft) [1.2 kg/m']. Air-conditioners employing cooling coil fans shall be rated at the air quantity specified by the manufacturer in his Standard Ratings. not to

. exceed 37.5 cfm per MBh [0.006 Us per kw] of

rated cooling capacity. or at the air quantity of which the drive is capable when operating against the external resistance specified in 5'

.1.3.6. whichever is less. Cooling coil air quantities as referred to herein apply to the air quantity experienced when the unit is cooling and dehumidifying under the StandardRatingConditions specifiedin this section. Once established for the Standard Rating test. no further adjustment to the drive orcircuit shaH be made. 5.1.3.4 Condenser Air Quantity. All Standard Ratings for air-cooled or evaporatively-cooled units shall be determined at the condenser air quantity which is inherent to the air-conditioner when operated with all the resistance elements '

Standard Ratings (MBh) [kwl (MBh) [kw1

135 [39.61 thru 210 [61.61 211 [61.71 thru 280 [82.11 281 [82.2) thru 350 [102.61 351 [102.71 thru 400 (117.2] 401 [117.31 thru 500 [146.61 501 [146.71 and over associated with the ,inlet or discharge attachments considered by the manufacturer as normal installation practice. Once established. the condenser air circuit ofthe air-conditioner shall remain unchanged throughout all tests prescribed herein. 5.1.3.5 Requirements for Separated Assemblies. All Standard Ratings for airconditionersin which the condenserorcondensing unit is separated from the cooling coil. as in Types Re. Rey. ReU and RCUY (Shown in**~ection** 4). shall be determined with at least 25 feet [7.62 m] of interconnection tubing on each line. At least 10 feet [3.05 mloftheinterconnection tubing shall be exposed to the outside conditions. with the rest of the tubing exposed to the inside conditions. The line sizes. insulation. and details of installation shall be in accordance with the manufacturer's published recommendations. 5.1.3.6 External Resistances. Commercial and industrial unitary air-conditioners shall be designed to work against, and tested at the following minimum external resistances when delivering the rated capacity and air quantityspecified in 5.1.3.3. In interpreting this requirement, it is understood that filters, heating devices, and other equipment recommended as part of the airconditioner be in place and that the net external resistances specified below are available for the duct system. The staticpressure at the return airintake ofthe unit shall not be a positive pressure. 5.1.4 Optional Rating Conditions. Commercial and industrial unitary air-conditioners which incorporate an outdoor air cooling coil shall use the Standard Rating Conditions (see ,5.1.3 thru 5

. 1.3.6) for rating, except for the following changes:

a. Unit shall be adjusted to take in 20 per cent outdoor air

Minimum External Resistances

(Inches of Water) [Pal 0.35 [87.21 0.40 [99.61 0.45 (112.11 0.55 (137.01 0.65 [161.91 0.75 [186.81
3ARI STAN DARD 

### 360-86

_______________________ _
b. Return air temperature conditions shall be adjusted to provide 80 F [26:7 C] dry bulb. 67 F [19.4 C] wet bulb temperatures for the total combined air quantity (return air plus outside air) to the main cooling coil. See Appendix A for capacity calculations. 5.2 Part Load Rating. Systems which are capable of capacity reduction shall be rated at 100% and at each step ofcapacityreduction provided by the refrigeration system(s) as published by the manufacturer. These rating points shall be used to calculate the IPLV (see 5.2.2). 5.2.1 Part Load Rating Conditions. The conditions oftestfor partload ratings are the same as for the Standard Ratings (See 5.1) except for the following: 5.2.1.1 Part Load Rating Temperatures. For all units Air temperature entering indoor portion

ofunit

.............80 F [26.7°C] dry bulb 67 F [19.4°C]wet bulb
For air-cooled units Air temperature entering outdoor portion ofunit

.............80 F [26.7°C] dry bulb (and 67 F [19.4 C] wet bulb when condensate is r.ejected into the air stream) For evaporatively-cooled units Air temperature entering outdoor portion of unit

.... . ........80 F [26.7°C] dry bulb 67 F [19.4°C]wet bulb For water-cooled units Water temperature entering

condenser

..................75 F**[23.~C]** Water flow rate (Same as Standard Rating Conditions) 5.2.1.2 The capacity reduction means may be adjusted to obtain the specified step of unloading. No manual adjustment of indoor and outdoor air quantities from those of the Standard Rating Conditions shall be made. However. automatic adjustment ofoutdoor air quantities by system function is permissible. 5.2.2 Integrated Part Load Value (IPLV). For equipment covered bythis standard, the IPLV (in EER) shall be calculated as fOllows:

4 a. Determine the capacity and EER at the conditions specified in 5.2. b. Determine the part-load factor (PLF) from Figure 1 "Part-Load Factor Curve" at each rating point (see example in Appendix B).
c. Use the following equation to calculate IPLV:
IPLV 

## = (PLF1 - PLF:z) 

### (EERJ ; EER:z)

.


### + PLF:z

-

# P~F3 (EER:z ; EER3)


### +
........ . (PLF

_ PLF) 

### (EER"_J 

### + EER") 

### + "-1 " 2 

### + (PLF")(EER") where: PLF = Part-LoadFactordeterminedfrom Figure 1 n 

## = Total number ofcapacity steps Subscript 1 = 100% capacity and EER atpartload rating conditions Subscript2; 3 etc. 

## = specific capacity andEER at part-load steps per5.2. 5.3 Application Ratings. Ratings at conditions of temperature or air quantity, other than those specified in 5.1.5 and 5.2.1. may be published as application ratings. and shall be based on djlta determined by the methods prescribed in this Section. 5.4 Publication of Ratings. Whenever application ratings are published or printed. they shall include. or be accompanied by.the Standard Rating plus the PartLoad Rating (where applicable). clearly designated as such. including a statement of the conditions at which the ratings apply. 5.4.1 Capacity Designation. The capacity designation used in published specifications. literature or advertising. controlled by the manufacturer. for air-conditioners rated under this standard. are to be expressed only in MBh [kw] at the Standard Rating Conditions specified in 5.1.5 plus Part Load Rating Conditions specified in 5.2.1. and in the terms described in 5.1.1 and 5.1.2. Horsepower. tons. or other units shall not be used as capacity designations. 5.5 Tolerances. To comply with this standard. published cooling capacity and energy efficiency ratio shall be based on data obtained in accordance with the provisions of this section. and shall be such that any production unit. when tested.**~ill** meet these ratings exceptfor an allowance to covertesting and manufacturing variations; the amount of allowance to be minus 5 per cent.--------________________ ARI STANDA RD 360-86

PART LOAD FACTOR CURVE

1.0**~ ~**  0.9 

### / 

# /
0.8 

# /
0.7 

# I 

# I G:' IJ .-J 0

.6 

### f!::. ' 

## ) a:

### ~ 0.5 

# I**~** 

# I u.: 

## 1/ Cl 0.4 

## C§ 

# I .-J 

## li: 0.3 

# /**~** 

# V
0.2 

# / 

# L
0.1 

# /**~**

### V'**~**

# V

0 0 20 40 60 80 100

PERCENT OF FULL-LOAD CAPACITY AT PART-LOAD CONDITIONS



### Note: Curve is Based on Following Equation:**~LF** = 

### AO +-(A1xQ)+(A2xQ2)+(A3xQ3)+(A4xQ")+(A5xQS)+(A6xQ6) 

### where: PLF = 

### Part-Load Factor Q 

## = Percent offull-load capacity at part-load rating conditions. AO 

## = -0.12773917 X 

### 10- 6 

### Al 

## = -0.27648713 x 

### 10- 3 

### A2 

## = 0.50672449 X 

### 10- 3 

### A3 = 

### -0

.25966636 x 

### 10-" A4 

## = 0.69875354 x 

### 10- 6 

### A5 

## = -0.76859712 

### x 10- 8 

### A6 

## = 0

.28918272 X 

### 10- 10

FIGURE 1ARt STAN DARD 360-86

_______________________ _
Section 6. Performance Requirements 6.1 Performance Requirements. To comply with this standard. commercial and industrial unitary airconditioners shall be designed and produced in accordance with the provisions ofthis section in such a manner that any production unit will meet the requirements detailed herein. 6.2 Maximum Operating Conditions Test. Commercial and industrial unitary air-conditioners shall be designed and produced to pass the following maximum operating conditions test with a cooling coil air quantity as determined under 5.1.3.3.

6 6.2.1 Temperature Conditions. For all units Air temperature surrounding unit

................115 F [46. 1°C] dry bulbAir temperature entering indoor portion of unit

..........95 F [35"C] dry bulb 71 F [21.7°C] wet bulb For water-cooled units Water temperature entering

condenser

....................90 F [32.2°C] Water temperature leaving

condenser

...................100 F [37.8°C] For air-cooled units Outside air

temperature
.........115 F [46. 1°C] dry bulb (and 75 F [23.9°C]wet bulb when condensate is rejected to the condenser air stream) at the standard condenser ?;r quantity specified and stated by the manufacturer. For evaporatively-cooled units Outside air

temperature
.........100 F [37.8°C] dry bulb 80 F [26.7°C] wet bulb Make-up water temperature
......90 F [32.3°C] 6.2.2 Voltages. 6.2.2.1 Tests shall be run at 90percentand 110 per cent ofthe unit's nameplate rated voltage at the unit's service connection and at rated frequency. orat a lower than 90percent minimum or a higher than 110per cent maximum voltage. iflisted on the nameplate. 6.2.3 Procedure.

-Forunits orponions thereofintended to be installed only indoors. this temperature may be reduced to 95 F (3S·Cl bulb. 6.2.3.1 The air-conditioner shall be operated continuously for two hours at the temperature conditions and**voltag~(s)** specified. 6.2.3.2 All powerto the air-conditionershall be cut off for a period sufficient to cause the compressor to stop (not to exceed five seconds) and then restored. 6.2.4 Requirements. 6.2.4.1 During both entire tests. the airconditioner shall operate without failure of any of its parts. 6.2.4.2 The unit shall resume continuous operation within one hour of restoration of power and shall then operate continuously for one hour. Operation and resetting of safety devices priorto establishmentofcontinuousoperation is permitted. 6.2.4.3 Units with water-cooled condensers shall be capable of operation under these maximum conditions at a water-pressure drop not to exceed 15 psi [103.4 kPa], measured across the unit. 6.2.5 Optional Maximum Operating Conditions Test. Commercial and industrial unitary airconditioners which incorporate an outdoor air cooling coil shall use the conditions, voltages and procedure (see 6.2 thru 6.2.3) and meet the requirements of 6.2.4. except for the following changes:

a. Outdoor air set as in 5.1.4a. b. Return air temperature conditions shall be adjusted to provide 95 F [35°C] dry bulb. 71 F [21.7°C] wet bulb temperatures for the total combined air quantity (return air plus outside air) to the main cooling coil.
c. Outdoor air entering outdoor air cooling coil shall be 115 F [46.1°CJ dry bulb and 75 F [23.9"C] wet bulb temperatures. 6.3 Low- Temperature Operation Test. Commercial and industrial unitary air-conditioners shall be designed and produced to pass the following low-temperature operation test when operating with initial air quantities as determined in 5.1.3.3. 5.1.3.4 and with controls and dampers set to produce the maximum tendency to frost or ice the evaporator, provided such settings are not contrary to the manufacturer's instructions to the user: 6.3.1 Temperature COllditions. For all units Air temperature entering indoor portion

of unit

...............67 F [19.4°C] dry bulb 57 F [13.9. 0C] wet bulb---------_______________ ARI STAN DARD 360-86

For water-cooled units Water temperature leaving

condenser

....................70 F [2 I. 1°C] For air-cooled and evaporatively-cooled units Outside air temperature
..67 F [19.4°C] dry bulb 57 F [13.9°C] wet bulb· 6.3.2 Voltage and Frequency. This test shall be performed at nameplate rated voltage and frequency. 6.3.3 Procedure. The test shall be continuouswith the unit on the cooling cycle for not less than four hours afterestablishment ofthe specifiedtemperature conditions. The unit will be peqnitted to start and stop under control of an automatic limit device, if provided. 6.3.4 Requirements. 6.3.4.1 During the entire test. the airconditionershall operate without damage to the equipment. 6.3.4.2 During the entire test, the air quantity

*The wei-bulb lemperalure condilion is nol required when testing air-cooled condensers which do not evaporale condensalc

. shall not drop more than 25 per cent from that determined under the Standard Rating Test. 6.3.4.3 During the test. and during the defrosting period afterthe completion ofthe test. all ice or meltage must be caught and removed by the drain provisions. 6.4 Tolerances. The conditions for the tests outlined in 6.2 and 6.3. are average values subject to tolerances of :t1.0 F [:to.S6°C] for air wet-bulb and dry

-bulb temperatures. :to.S F [:to.28°C] for water temperatures. and :t1.0 per cent of the reading for voltages. Section 7. Safety Recommendations 

### 7.1 It is strongly recommended that the product be designed, constructed, assembled and installed in ac-. cordance with nationally recognized safety standards and codes appropriate for products covered by this standard. Section 8. Conformance 

### 8.1 Conformance. While conformance with this standard is voluntary conformance shall not be claimed or implied for products or equipment within.**i~** purpose (section 1) and scope (section 2) unless such claims meet all of the requirements ofthe standard.



### APPENDIX A ALTERNATE TEST METHOD

Section A 1. Capacity Calculation for Unitary Equipment Using an Outdoor Air Cooling Coil

Al.l To determine the capacity of unitary equipment using an outdoor air cooling coil (See Fig. A.l for test facility). the following equation shall be used: Where: qu =
woa 

## = W ra 

## = hon = net capacity of unit, Mbh [kW] weight ofoutside make-up air, Ib per hr [kg/s] weight ofreturn air, Ib per hr [kg/s] enthalpy of outside air, Btu per Ib of dry air [J/kg]

. enthalpy of return air, Btu per lb of dry air [J/kg] enthalpy of supply air, Btu per lb of dry air [J/kg]

7CD CD I o CD C') 

### c 

## a: 

# « c 

## z 

# « t- (J)


## a: 

## « 

# -

OUTSIDE AIR

# ~===11 P---ll 

# -

OUTDOOR AIR COIL

RETURN AIR CODE TESTER



# -- MAIN COOLING COIL



### ALTERNATE TEST METHOD

. ELIMINATE RETURN AIR CODE TESTER AND MEASURE OUTSIDE AIR WITH A SEPARATE CODE TESTER. Fig. A1 ARI Test set-up for units using an ' outdoor coli SUPPLY AIR CODE TESTER 

# -

--

00________________________ ARI STAN DARD 360-86



### APPENDIX 8 METHOD AND EXAMPLE OF CALCULATING INTEGRATED PART LOAD VALUES (IPLV)

Section B1. Purpose and Scope 

### B1.1 Purpose. 

### B.1.1.1 This appendix shows example calculations for determining Integrated Part Load Values (IPLV). ' '


### B1.2 Scope. 

### B.1.2.1 This appendix is for equipmentcovered by this standard.

Section 

### 82. Equations and Definitions of Terms 

### B2.1 General Equation.

IPL V = (PLF1 - PLF 2 ) (EERI ; EER})



### + PLF 2 - PLF J (EER2 ; EERJ)


### +
........ . (PLF

- PLF) (EER"_1 

### + EER") 

### + n-l n 2 

### + (PLF")(EER")

Where: PLF = Part-Load Factor determined from Figure 1
n 

## = Total number ofcapacity steps Subscript 

### 1 

## = 100% capacity and EER at part-load rating conditions Subscript 

### 2; 3, etc. = specific capacity steps per 

### 5.2. Section B3. Calculation Example'for a Four Capacity Step System 

### B3.1 Unit Performance Data & Sample Calclliation. 

### B3.1.1 Assume equipment has four capacity steps as follows: 

### • 100% (full load) 

### • 75% offull load 

### • 50% offull load • 25% offull load 

### B3.1.2 Obtain part load factors from Figure 1 (see Figure 

### B1 Example). 

### B3.1.3 Obtain EER at each capacity step per

### 5.2. B3.1.4 Calculate IPL V using the general equation with: n=4 PLF1 

### = 1.0 PLF 2 

## = 0.9 PLF3 = 

### 0.4 PLF 4 

## = 0.1 EERl 

## = 8.9 EERz = 

### 7.7 EER3 

## = 7.1 EER4 = 

### 5.0
Enterthe above values in the general equation, 

### (B2.1).
IPLV 

## = (1.0_0.9)(8.9 ; 7.7)



### + (0.9_0.4)(7.7 ; 7.1)
(7.1+5.0) ( 50) + (0.4-0.1) 2 

### + 0.1 x .


## = (0.lX8.3) 

### + (0.5x7.4)

.. + ,(0.3 x 6.0) 

### + 0.5

= 

### 0.83 + 3.70 

## + 1.80 

## + 0.5 IPL V 

## = 6.83 rounded to 

### 6.8 Tofurtherillustrate the calculationprocess seeFigure 

### B2 Example.

9

### 10ARI STAN DARD 

### 360-86

------------------------

PART LOAD FACTOR CURVE

1.0 

### " .JIll'" ",..,- 

### /**~** 0

.9 J 

### '" j 0

.8 

# I

. 

### - 0

.7 

# l

# I u::- 0.6 ...J 

# e:. j cr: 

# I 12 0

.5 0 

# I 'I' 

### if C 0.4 

# -**~** 

## If C§ 

# .... 

# - J ...J

### ~ 0.3 

# I**~** 

# V
0

.2 

# I /
0.1 

# - ,/**~** 

### V --'

## /'**~~** 0 0 20 40 60 80 100

PERCENT OF FULL-LOAD CAPACITY AT PART-LOAD CONDITIONS



### Note: Curve is Based on Following Equation: PLF = 

### AO + (AlxQ)+(A2xQ2)+(A3xQ3)+(A4xQ4)+(A5xQS)+(A6xQ6) where: PLF = 

### Part-Load Factor Q = 

### Percent offull-load capacity at part-load rating conditions

. AO = 

### -0.12773917 X 

### 10- 6 

### Al = 

### -0.27648713 x 10-3 A2 = 

### 0.50672449 x 10-3 A3 = - 

### 0.25966636 X 

### 10-4 A4 = 

### 0.69875354 x 10- 6 

### A5 

## = -0.76859712 x 10- 8 

### A6 = 

### 0.28918272 x 10- 10

FIGURE 81 EXAMPLE

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# - - FIGURE B2 EXAMPLE IPLV CALCULATION 

### Using information from B3.I.!; B3.1.2 and B3.I.3

Capacity Mfrs. Net % Full PLFJ Mfrs. Part Avg

. Part PLF Difr.

Step Cap. (Tons) Load Cap.l Load EER Load EER (For R Only)

1 50

.0 100% 1.0 8

.91
= 8.3 (1.0-0.9)=0.1 2 37

.5 75% 0

.9 7

.7
= 7.4 (0.9-0.4) =0.5 3 25

.0 50% 0

.4 7.1
= 6.0 (0.4-0.1)=0.3 4 12.5 25% 0

. 1 5

.0
= 5.0' (0.1-0.0)=().I

---- 0% 0

.0 

### --_.-

- - - - Weighted Avg. EER x PLF 

### om. = Avg.

8.3 x 0

. 1 = 0.83 7.4 x 0.5 = 3.70 6.0 x 0

.3 = 1.80 5.0' x 0.1 = 0.50 Single numbl!r IPLV 6

.83·

----- - -- - ·Rounded to 6.8 NOTES 'For the range between 0% capacity and the last capacity step. use EER of the last capacity step for the aVl!rage EER. 7The 100% capacity and EER Drc to be dctl!rminl!d lit the purt-Iolld rolting conditions

. lPart-load factor from Figure B1. 

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## » Z C 

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### en