1、 2004 STANDARD for 4100 N. FAIRFAX DR., SUITE 200 y ARLINGTON, VIRGINIA 22203 PERFORMANCE RATING OF POSITIVE DISPLACEMENT CONDENSING UNITS Standard 520 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted w
2、ithout license from IHS-,-,-IMPORTANT SAFETY RECOMMENDATIONS ARI 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 tha
3、t products be designed, constructed, assembled, installed and operated in accordance with nationally recognized safety standards and code requirements appropriate for products covered by this standard/guideline. ARI uses its best efforts to develop standards/guidelines employing state-of-the-art and
4、 accepted industry practices. ARI does not certify or guarantee that any tests conducted under its standards/guidelines will be non-hazardous or free from risk. Note: This standard supersedes ARI Standard 520-97. Price $10.00 (M) $20.00 (NM) Copyright 2004, by Air-Conditioning and Refrigeration Inst
5、itute Printed in U.S.A. Registered United States Patent and Trademark Office Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE OF CONTENTS SECTION PAGE Section 1. Purpo
6、se .1 Section 2. Scope 1 Section 3. Definitions 1 Section 4. Test Requirements2 Section 5. Rating Requirements 2 Section 6. Minimum Data Requirements for Published Ratings.3 Section 7. Operating Requirements.3 Section 8. Marking and Nameplate Data.3 Section 9. Conformance Conditions3 TABLES Table 1.
7、 ARI Standard Rating Conditions for Condensing Units for Refrigeration Applications.4 APPENDICES Appendix A. References - Normative 5 Appendix B. References - Informative.5 Appendix C. Method to Handle Zeotropic Mixtures - Informative .6 FIGURES Figure C1. Cycle Process for Single Component Refriger
8、ants and Azeotropic Mixtures.6 Figure C2. Cycle Process for Zeotropic Refrigerant Mixtures7 Figure C3. Definitions of Subcooling and Superheating.8 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted witho
9、ut license from IHS-,-,-ARI STANDARD 520-2004 1 PERFORMANCE RATING OF POSITIVE DISPLACEMENT CONDENSING UNITS Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish, for positive displacement condensing units: definitions; test requirements; rating requirements; minimum data req
10、uirements 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, designers, installers, contractors and users. 1.1.2 Review and Amendment. This standard i
11、s subject to review and amendment as technology advances. Section 2. Scope 2.1 Scope. This standard applies to electric motor driven, single and variable capacity positive displacement condensing units for air-cooled, evaporatively-cooled, and water-cooled refrigeration applications. 2.1.1 Refrigera
12、nt. The rating points in this standard are based on commonly used refrigerants. 2.2 Exclusions. 2.2.1 This standard does not apply to condensing units intended for use in: a. Household refrigerators and freezers b. Automotive air-conditioners c. Dehumidifiers Section 3. Definitions All terms in this
13、 document follow 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 Coefficient of Performance (COP). A ratio of the Cooling/Heating Capacity in watts W to the power
14、input values in watts W at any given set of Rating Conditions expressed in watts/watt W/W. For heating COP, supplementary resistance heat shall be excluded. 3.1.1 Standard Coefficient of Performance. A ratio of the capacity to power input value obtained at Standard Rating Conditions. 3.2 Energy Effi
15、ciency Ratio, (EER). A ratio of the Cooling Capacity in Btu/h to the power input values in watts at any given set of Rating Conditions expressed in Btu/(Wh). 3.2.1 Standard Energy Efficiency Ratio. A ratio of the capacity to power input value obtained at Standard Rating Conditions. 3.3 Positive Disp
16、lacement Condensing Unit. A specific combination of refrigeration system components for a given refrigerant, consisting of one or more electric motor driven positive displacement compressors, condensers, and accessories as provided by the manufacturer. Copyright Air-Conditioning and Refrigeration In
17、stitute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 520-2004 2 3.4 Published Rating. A statement of the assigned values of those performance characteristics, under stated rating conditions, by which a unit may
18、be chosen to fit its application. These values apply to all units of like nominal size and type (identification) produced by the same manufacturer. The term Published Rating includes the rating of all performance characteristics shown on the unit or published in specifications, advertising or other
19、literature controlled by the manufacturer, at stated Rating Conditions. 3.4.1 Application Rating. A rating based on tests performed at application Rating Conditions, (other than Standard Rating Conditions). 3.4.2 Standard Rating. A rating based on tests performed at Standard Rating Conditions. 3.5 R
20、ating Conditions. Any set of operating conditions under which a single level of performance results and which causes only that level of performance to occur. 3.5.1 Standard Ratings Conditions. Rating conditions used as the basis of comparison for performance characteristics. 3.6 Refrigerating Capaci
21、ty. The capacity associated with the increase in total enthalpy between the liquid refrigerant entering the expansion valve and superheated return gas multiplied by the mass flow rate of the refrigerant. 3.7 “Shall“ or “Should“. “Shall” or “should” shall be interpreted as follows: 3.7.1 Shall. Where
22、 “shall“ or “shall not“ is used for a provision specified, that provision is mandatory if compliance with the standard is claimed. 3.7.2 Should. “Should,“ is used to indicate provisions which are not mandatory, but which are desirable as good practice. Section 4. Test Requirements 4.1 Test Requireme
23、nts. All Published Ratings shall be verified by tests conducted in accordance with ASHRAE Standard 23. Section 5. Rating Requirements 5.1 Standard Ratings. Standard Ratings shall be established at the Standard Rating Conditions in Table 1 and shall include its associated power input and Energy Effic
24、iency Ratio (EER). When tested with a specified motor, the associated compressor speed (external drive compressors only) shall also be included as part of the rating. The power required to operate all included accessories such as condenser fans, water pumps, controls, and similar accessories shall b
25、e accounted for in the power input and Energy Efficiency Ratio. When external accessories such as water pumps, remote fans, and similar accessories are required for the operation of the unit but not included with the unit, the manufacturer shall clearly state that the rated power input and Energy Ef
26、ficiency Ratio do not account for additional power required by these external accessories. If a water-cooled condenser is used, the cooling water flow rate and pressure drop shall be specified as part of the rating. 5.2 Application Ratings. Application Ratings shall consist of a Capacity Rating plus
27、 the associated power input and Energy Efficiency Ratio (EER). When tested with a specified motor, the associated compressor speed (external drive compressors only), shall also be included as part of the rating. The power required to operate all included accessories such as condenser fans, water pum
28、ps, controls, and similar accessories shall be accounted for in the power input and Energy Efficiency Ratio. When external accessories such as water pumps, remote fans, and similar accessories are required for the operation of the unit but are not included with the unit, the manufacturer shall clear
29、ly state that the rated power input and Energy Efficiency Ratio do not account for additional power required by these external accessories. If a water-cooled condenser is used, the cooling water flow rate and pressure drop shall be specified as part of the rating. All of the above data shall be repo
30、rted at stated conditions other than those presented in Table 1. Application Ratings shall be reported at rated voltage, phase, and frequency. Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without li
31、cense from IHS-,-,-ARI STANDARD 520-2004 3 5.3 Tolerances. To comply with this standard, measured test results shall not be less than 95% of Published Ratings for capacity and energy efficiency and power input shall be no more than 105% of the rated values. Section 6. Minimum Data Requirements for P
32、ublished Ratings 6.1 Minimum Data Requirements for Published Ratings. As a minimum, Published Ratings shall include all Standard Ratings. All claims to ratings within the scope of this standard shall include the statement “Rated in accordance with ARI Standard 520”. All claims to ratings outside the
33、 scope of this standard shall include the statement “Outside the scope of ARI Standard 520”. Wherever Application Ratings are published or printed, they shall include a statement of the conditions at which the ratings apply. Section 7. Operating Requirements 7.1 Maximum Loading Conditions. The maxim
34、um suction dew point temperature limit shall be published. This limit shall be established with the condensing unit operating at conditions as described below: a. Ambient temperature surrounding the condensing unit of 115F 46.1C dry-bulb for all types, 115F 46.1C dry-bulb air temperature entering co
35、ndenser on air-cooled condensing units, and 80F 27C wet-bulb for evaporatively-cooled condensing units. b. Water inlet temperature of 90F 32C and water outlet temperature of 105F 40.6C for water-cooled condensing units. Make-up water temperature of 90F 32C for evaporatively-cooled units. 7.2 Loading
36、 Requirements. The condensing unit shall be capable of operating continuously at the stated maximum loading conditions of 7.1 for a minimum period of two hours at minimum and maximum utilization voltages as described in ARI Standard 110, Table 1. Section 8. Marking and Nameplate Data 8.1 Condensing
37、Unit Nameplate Marking. As a minimum, each condensing unit shall have a nameplate, affixed to its housing or base, on which at least the following information shall be marked: a. Manufacturers name and/or symbol b. Model number c. Refrigerant designation per ASHRAE 34 d. Input voltage and frequency
38、(Hz) e. Rated-load current (where applicable) Nameplate voltages for 60 Hertz systems shall include one or more of the equipment nameplate voltage ratings shown in Table 1 of ARI Standard 110. Nameplate voltages for 50 Hertz systems shall include one or more of the utilization voltages shown in Tabl
39、e 1 of IEC Standard 60038. Section 9. Conformance Conditions 9.1 Conformance. While conformance with this standard is voluntary, conformance shall not be claimed or implied for products or equipment within the standards Purpose (Section 1) and Scope (Section 2) unless such product claims meet all of
40、 the requirements of the standard and all of the testing and rating requirements are measured and reported in complete compliance with the standard. Any product that has not met all the requirements of the standard shall not reference, state, or acknowledge the standard in any written, oral, or elec
41、tronic communication. Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 520-2004 4 Table 1. ARI Standard Rating Conditions for Condensing Units for Refrigeration
42、 Applications* Type of Condensing Unit Air-Cooled Water-Cooled Evaporatively- Cooled Suction Dew Point Temperature Compressor Type Return Gas Temperature Air Entering Dry-Bulb (indoor/outdoor) In Out Air Entering Wet-Bulb Temperature Variable Capacity Setting* F C F C F C F C F C F C 45 7.2 All 65 1
43、8 90/95 32/35 85 29 95 35 75 24 MAX/MIN 20 -6.7 All* 40/ 65* 4.4/ 18* 90/95 32/35 85 29 95 35 75 24 MAX/MIN -10 -23 Hermetic 40 4.4 90/95 32/35 85 29 95 35 75 24 MAX/MIN -25 -32 All* 40/ 65* 4.4/ 18* 90/95 32/35 85 29 95 35 75 24 MAX/MIN -40 -40 All* 40/ 65* 4.4/ 18* 90/95 32/35 85 29 95 35 75 24 MA
44、X/MIN * Sub-cooling in F C, shall be stated as obtained under pertinent application conditions, as measured at the liquid line leaving the condensing unit. * 1) For hermetic type compressors, 40F 4.4C return gas temperature shall be used. 2) For external drive and accessible hermetic type compressor
45、s, 65F 18C return gas temperature shall be used. * The maximum and minimum capacity setting is the highest and lowest displacement capacity by the condensing unit. Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking
46、 permitted without license from IHS-,-,-ARI STANDARD 520-2004 5 APPENDIX A. REFERENCES - NORMATIVE A1 Listed here are all standards, handbooks and other publications essential to the formation and implementation of the standards. All references in this appendix are considered as part of the standard
47、. A1.1 ANSI/ASHRAE Standard 34-2001 with Addenda, Number Designation and Safety Classification of Refrigerants, 2001, American National Standards Institute/American Society of Heating, Refrigerating and Air-Conditioning Engineers, 11 West 42ndStreet, New York, NY 10036, U.S.A./1791 Tullie Circle N.E
48、., Atlanta, GA 30329, U.S.A. A1.2 ARI Standard 110-2002, Air-Conditioning and Refrigerating Equipment Nameplate Voltages, 2002, Air-Conditioning and Refrigeration Institute, 4100 North Fairfax Drive, Suite 200, Arlington, VA 22203, U.S.A. A.1.3 ASHRAE Standard 23-1993, Methods of Testing for Rating
49、Positive Displacement Refrigerant Compressors and Condensing Units, 1993, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, N.E., Atlanta, GA 30329-5478, U.S.A. A1.4 ASHRAE Terminology of Heating, Ventilation, Air Conditioning and Refrigeration, Second Edition, 1991, American Society of Heating, Refrige
