AHRI 366 SI-2009 Performance Rating of Commercial and Industrial Unitary Air-Conditioning Condensing Units.pdf

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1、 AHRI Standard 366 (SI) 2009 Standard for Performance Rating of Commercial and Industrial Unitary Air-Conditioning Condensing Units Price $15.00 (M) $30.00 (NM) Copyright 2009, by Air-Conditioning, Printed in U.S.A. Heating, and Refrigeration Institute Registered United States Patent and Trademark O

2、ffice IMPORTANT SAFETY DISCLAIMER AHRI does not set safety standards and does not certify or guarantee the safety of any products, components or systems designed, tested, rated, installed or operated in accordance with this standard/guideline. It is strongly recommended that products be designed, co

3、nstructed, assembled, installed and operated in accordance with nationally recognized safety standards and code requirements appropriate for products covered by this standard/guideline. AHRI uses its best efforts to develop standards/guidelines employing state-of-the-art and accepted industry practi

4、ces. AHRI does not certify or guarantee that any tests conducted under the standards/guidelines will not be non-hazardous or free from risk. Note: This standard supersedes ARI Standard 365-2002. For I-P ratings, see AHRI Standard 365 (I-P) 2009. TABLE OF CONTENTS PAGE Section 1. Purpose .1 Section 2

5、. Scope 1 Section 3. Definitions 1 Section 4. Classifications.2 Section 5. Test Requirements2 Section 6. Rating Requirements 3 Section 7. Minimum Data Requirements for Published Ratings.7 Section 8. Operating Requirements.8 Section 9. Marking and Nameplate Data.9 Section 10. Conformance Conditions9

6、TABLES Table 1. Classifications of Commercial and Industrial Air-Conditioning Condensing Units .2 Table 2. Standard Rating Conditions3 Table 3. ICOP Part-Load Rating Conditions5 APPENDICES Appendix A. References - Normative10 Appendix B. References Informative.10 11_AHRI STANDARD 366 (SI)-2009 1PERF

7、ORMANCE RATING OF COMMERCIAL AND INDUSTRIAL UNITARY AIR-CONDITIONING CONDENSING UNITS Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish for Commercial and Industrial Unitary Air-Conditioning Condensing Units: definitions; classifications; test requirements; rating requirem

8、ents; minimum data requirements for Published Ratings; operating requirements; marking and nameplate data; and conformance conditions. 1.1.1 Intent. This standard is intended for the guidance of the industry, including manufacturers, engineers, installers, contractors and users. 1.1.2 Review and Ame

9、ndment. This standard is subject to review and amendment as technology advances. Section 2. Scope 2.1 Scope. This standard applies to factory-made Commercial and Industrial Unitary Air-Conditioning Condensing Units greater than or equal to 40.0 kW as defined in Section 3. 2.1.1 Energy Source. This s

10、tandard applies only to electrically-driven, mechanical compression-type condensing units. 2.2 Exclusions. This standard does not apply to the testing and rating of condensing units for refrigeration purposes, as defined in AHRI Standard 520. Section 3. Definitions All terms in this document shall f

11、ollow the standard industry definitions in the current edition of ASHRAE Terminology of Heating, Ventilation, Air-Conditioning and Refrigeration unless otherwise defined in this section. 3.1 Bubble Point. Refrigerant liquid saturation temperature at a specified pressure. 3.2 Commercial and Industria

12、l Unitary Air-Conditioning Condensing Unit. A factory-made assembly of refrigeration components designed to compress and liquefy a specific refrigerant. It consists of one or more refrigerant compressors, refrigerant condensers (air-cooled, evaporatively cooled, and/or water-cooled), condenser fans

13、and motors (where used) and factory-supplied accessories. 3.3 Cooling Capacity. The capacity in watts obtained at specific conditions. It is equal to the increase in total enthalpy between the liquid refrigerant entering the expansion valve and superheated return gas multiplied by the mass flow rate

14、 of the refrigerant. 3.4 Coefficient of Performance (COP). A ratio of the Cooling Capacity in kilowatts to the power input in kilowatts at any given set of Rating Conditions. 3.5 Dew Point. Refrigerant vapor saturation temperature at a specified pressure.3.6 Integrated Coefficient of Performance (IC

15、OP). A single number part-load efficiency figure of merit calculated per the method described in this standard. 3.7 Integrated Part-Load Value (IPLV). A single number cooling part-load figure of merit calculated per the method described in Appendix C. 3.8 Published Rating. A statement of the assigne

16、d values of those performance characteristics, under stated Rating Conditions, AHRI STANDARD 366 (SI)-2009_ 2 by which a unit may be chosen to fit its application. These values apply to all units of like nominal size and type (identification) produced by the same manufacturer. As used herein, the te

17、rm Published Rating includes the rating of all performance characteristics shown on the unit or published in specifications, advertising, or other literature controlled by the manufacturer, at stated Rating Conditions. 3.8.1 Application Rating. A rating based on tests performed at application Rating

18、 Conditions (other than Standard Rating Conditions). 3.8.2 Standard Rating. A rating based on tests performed at Standard Rating Conditions. 3.9 Rating Conditions. Any set of operating conditions under which a single level of performance results and which causes only that level of performance to occ

19、ur. 3.9.1 Standard Rating Conditions. Rating Conditions used as the basis of comparison for performance characteristics.3.10 “Shall“ or “Should.“ “Shall“ or “should“ shall be interpreted as follows: 3.10.1 Shall. Where “shall“ or “shall not“ is used for a provision specified, that provision is manda

20、tory if compliance with the standard is claimed.3.10.2 Should. “Should“ is used to indicate provisions which are not mandatory but which are desirable as good practice. 3.11 Single Number Rating. The Cooling Capacity and COP determined by the results of the tests at Rating Condition No. 1 for air-co

21、oled and evaporatively-cooled condensing units and at Rating Condition No. 3 for water-cooled condensing units (Section 6). Section 4. Classifications Equipment covered within the scope of this standard shall be classified as shown in Table 1: Table 1. Classifications of Commercial and Industrial Ai

22、r-Conditioning Condensing Units Designation AHRI Type Condenser Type Arrangement RCU-A Air RCU-E Evaporatively Remote Condensing Unit (RCU) RCU-W Water COMP COND Section 5. Test Requirements 5.1 Test Requirements. All Standard Ratings shall be verified by tests conducted in accordance with ANSI/ASHR

23、AE Standard 23 and with the test methods and procedures as described in this standard. 5.1.1 An alternate method of verification may be by tests conducted in accordance with ANSI/ASHRAE Standard 37 provided that the suction dew point temperature and the return gas temperature are determined from the

24、 procedures in this standard. _AHRI STANDARD 366 (SI)-2009 3Section 6. Rating Requirements 6.1 Standard Ratings. Published Ratings shall be obtained at one or more of the Standard Rating Conditions as shown in Table 2. Power input shall be the total power input to the compressor(s), fan(s), controls

25、, and any other components included as part of the condensing unit. Table 2. Standard Rating Conditions Air- and Evaporatively-Cooled Condensing Units Rating Condition Air Temperature Entering and Surrounding Unit Refrigerant Temperature Entering Condensing Unit 1Dry-Bulb Wet-Bulb 2Suction Dew Point

26、 Return Gas C C C C 1 3 235.0 27.0 24.0 19.0 7.0 7.0 15.5 15.5 Water-Cooled Condensing Units Rating Condition Water Temperature Refrigerant Temperature Entering Condensing Unit 1Entering Leaving Suction Dew Point Return Gas C C C C 35.0 3 3 4 29.0 24.0 Same water flow rate as established above. 7.0

27、7.0 15.5 15.5 Notes: 1The liquid temperature and pressure leaving the condensing unit shall be reported by the manufacturer in its ratings. 2 Required for evaporatively-cooled condensing units only. 3The Single Number Ratings are determined by the results of the tests at Rating Condition No. 1 or at

28、 Rating Condition No. 3. 6.1.1 Values of Standard Cooling Capacity Ratings. These ratings shall be expressed only in terms of watts in multiples of 500 W for units with Standard Ratings of 117,000 W and under. For units with Standard Ratings of over 117,000 W, the ratings shall be expressed in multi

29、ples of 1,500 W. 6.1.2 Values of Standard Efficiency Ratings. COP and ICOP shall be expressed in multiples of 0.01. 6.1.3 Single Number Ratings. The reported values shall be determined by the results obtained at Rating Condition No. 1 or at Rating Condition No. 3. 6.1.4 Electrical Conditions. Standa

30、rd Rating tests shall be performed at the nameplate rated voltage(s) and frequency. For condensing units with dual nameplate voltage ratings, Standard Rating tests shall be performed at both voltages, or at the lower of the two voltages, if only a single Standard Rating is to be published.6.1.5 Cond

31、enser Airflow Rate. All Standard Ratings for condensing units shall be determined at the condenser airflow rate specified by the manufacturer where the fan drive is adjustable. Where the fan drive is direct-connected, Standard Ratings shall be determined at the condenser airflow flow established whe

32、n the condensing unit is operated with all of the associated inlet louvers and any duct work and attachments considered by the manufacturer as normal installation practice. Once established, the airflow circulation rate of the condensing unit shall remain unchanged throughout all tests prescribed he

33、rein, except as altered by automatic controls. 6.2 Part-Load Rating. Integrated Part-Load Value (IPLV) is in effect until January 1, 2010. See Appendix C for the method and calculation of IPLV. Effective January 1, 2010, all units rated in accordance with this standard shall include an Integrated Co

34、efficient of Performance (ICOP), even if they only have one stage of capacity control. AHRI STANDARD 366 (SI)-2009_ 4 6.2.1 General. The ICOP is intended to be a measure of merit for the part load performance of the unit. Each building may have different part load performance due to local occupancy

35、schedules, building construction, building location and ventilation requirements. For specific building energy analysis an hour-by-hour analysis program should be used. 6.2.2 Integrated Coefficient of Performance (ICOP). For equipment covered by this standard, the ICOP shall be calculated using test

36、s, derived data, and the following formula. ICOP = 0.020 A + 0.617 B + 0.238 C + 0.125 D 1 Where: A = COP at 100% capacity at design conditions B = COP at 75% capacity and reduced ambient (refer to Table 3) C= COP at 50% capacity and reduced ambient (refer to Table 3) D= COP at 25% capacity and redu

37、ced ambient (refer to Table 3) The ICOP rating requires that the unit efficiency be determined at 100%, 75%, 50% and 25% load at the conditions specified in Table 3. If the unit, due to its capacity control logic cannot be operated at the 75%, 50%, or 25% load points, then the 75%, 50%, or 25% perfo

38、rmance should be determined by plotting the efficiency vs. the percent load and using straight line segments to connect the actual performance points and interpolation to determine the rating performance at 75%, 50% and 25%. For the interpolation, an actual capacity point equal to or less than the r

39、equired rating point must be used to plot the curves. Extrapolation of the data is not allowed. If the unit cannot be unloaded to the 75%, 50%, or 25% load, then the unit should be run at the minimum step of unloading at the condensing unit conditions defined for each of the rating load points and t

40、hen adjust the efficiency for cyclic performance using the following equation. D C CF CTLFCapacityCOPLF(C (P P ) P=+2 Where: Capacity = Measured capacity (watts) at the lowest machine unloading point operating at the desired part load rating condition. PC= Compressor power (watts) at the lowest mach

41、ine unloading point operating at the desired part load rating condition. PCD = Condenser fan power (watts), if applicable at the minimum step of unloading at the desired part load rating condition PCT = Control circuit power and any auxiliary loads (watts). CD = is the degradation coefficient to acc

42、ount for cycling of the compressor for capacity less than the minimum step of capacity. CD should be determined using the following equation. 3 DC ( 0.13 LF) 1.13= +Where: LF = Fractional “on” time for last stage at the desired load point %Load (Full Load Unit Net Capacity)100LFPart Load Unit Net Ca

43、pacity=4 %Load = Standard rating point, i.e. 75%, 50%, 25%. _AHRI STANDARD 366 (SI)-2009 5Table 3. ICOP Part-Load Rating Conditions CONDITIONS C Refrigerant Entering Condensing Unit (For All Units) Suction Mid-Point Temperature 2Return Gas Temperature 7.0 15.5 Condenser (Air-Cooled) Entering Dry-Bul

44、b Temperature and Dry-Bulb Temperature Surrounding Unit Condenser Airflow rate (m3/s) For %Load 44.4%, Outdoor Air Temperature (OAT) =0.30 %Load + 5.0 For %Load 34.8%, EWT = 0.256 %Load + 3.8 For %Load 36.6%, EWB= 0.19 %Load + 4.4 For % Load = 36.6%, EWB = 11.6 NOTES: 1 Adjust condenser airflow as r

45、equired by the unit controls for head pressure control. 2 For refrigerants with a glide, the mid-point saturated suction temperature is the average of the bubble point and dew point. 6.2.3 Example calculations. Example 1 Condensing unit has proportional capacity control and capable of being run at t

46、he 75%, 50%, and 25% rating points. The following data was obtained from actual unit measurements. Stage Ambient Actual % Load Saturated Suction Capacity Compr. (PC) Cond. Fan (PCF) Control (PCT) COP C Capacity C W W W W W/W 4 35.0 100 7 141,187 43,535 2,100 100 3.09 3 27.5 75 7 105,889 28,731 2,100

47、 100 3.42 2 20.0 50 7 70,593 17,791 2,100 100 3.53 1 18.3 25 7 35,296 9,491 2,100 100 3.02 ICOP = (0.02 3.09) + (0.617 3.42) + (0.238 3.53) + (0.125 3.02) = 3.39 AHRI STANDARD 366 (SI)-2009_ 6 Example 2 Condensing unit has a single stage of capacity. The following data was obtained from the actual u

48、nit measurements. Stage Ambient Actual % Load Saturated Suction Capacity Compr. (PC) Cond. Fan (PCF) Control (PCT) COP C Capacity C W W W W W/W 1 35.0 100 7 141,187 43,535 2,100 100 3.09 1 27.5 98.8 7 139,540 38,877 2,100 100 3.40 1 20.0 100.3 7 141,666 35,261 2,100 100 3.78 1 18.3 98.7 7 139,413 35,475 2,100 100 3.70 The unit cannot unload to the 75%, 50%, or 25% points so tests were run with the compressor on at the ambients specifie