ASHRAE Standard 127 2020

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ASHRAE Standard 127-2020 – Method of Testing for Rating Air-Conditioning Units Serving Data Center (DC) and Other Information Technology Equipment (ITE) Spaces (ANSI Approved)

Published By	Publication Date	Number of Pages
ASHRAE	2020

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Description

ASHRAE Standard 127 establish a uniform set of test requirements for rating both existing and emerging cooling technologies that support DC and ITE systems. Regulatory agencies and industry advocates control precise efficiency ratings and performance requirements for identified product types. These requirements evolve with time and magnitude of installed base. This document serves to provide overarching test methodologies for DC and ITE cooling technologies, regardless of their state of adoption, to support rapid product evolution.Changes in the 2020 edition include modification of title, purpose, and scope (TPS), as well as extensive changes to Section 3,

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PDF Pages	PDF Title
1	ANSI/ASHRAE Standard 127-2020
3	CONTENTS
4	FOREWORD 1. PURPOSE 2. SCOPE 2.1 This standard applies to classes of air-conditioning units that are used to air condition data center (DC) and other information technology equipment (ITE) spaces. Such units must be able to be tested using an air enthalpy method and facilitate h… 2.2 Exclusions 3. DEFINITIONS
6	4. CLASSIFICATION 4.1 Normally, computer and data processing room air-conditioner (CDPR) units within the scope of this standard can be classified as shown below. There are eight basic types of air conditioners: 5. RATING REQUIREMENTS 5.1 Cooling System Standard Capacity Ratings. Standard cooling capacity is defined as 100% of the unit’s full capacity and is sometimes referred to as “standard rating.” Standard rating capacity shall be established at the standard rating condi…
11	5.2 Unit Efficiency Calculations
13	5.3 Part-Load Ratings. Part-load ratings may be included as application ratings at the manufacturer’s option. 5.4 Reheating System Standard Ratings. Standard ratings shall be established at the rating conditions specified in Informative Appendix F. Reheating tests are conducted without operating the cooling or humidifying portions of the air conditioner. Ope… 5.5 Humidification and Dehumidification System Standard Ratings. Standard ratings shall be established at the rating conditions specified in Informative Appendix F.
14	5.6 Air Filter Standard Ratings. Published air filter ratings shall be those defined in ASHRAE Standard 52.2 7. At any test condition described by this standard, the system shall be tested with clean filters of the manufacturer’s choice. Optional f… 5.7 Application Ratings. In addition to capacity ratings and iNSenCOP values at conditions of temperature, humidity, or altitude other than those specified in Section 5.1, application ratings may be published and shall be based on calculations or tes… 5.8 Publication of Ratings. Wherever application ratings are published or printed, they shall include or be accompanied by the standard rating. Application ratings shall be clearly designated as such, including a statement of the conditions at which … 5.9 Method for the Measurement and Designation of Noise Emitted by CDPRs. This section specifies the requirement for publishing sound power levels. One, two, or three measurement positions are required for each unit, depending on the unit configurati… 5.10 Capacity Designation. For air conditioners rated under this standard, the cooling system and dehumidification system capacity designations used in published specifications, literature, or advertising controlled by the manufacturer shall be expre… 5.11 Tolerances. To comply with this standard, published cooling capacity ratings and power ratings shall be based on data obtained in accordance with the provision of this section and shall be such that any production unit, when tested, will meet th… 6. CONFORMANCE
15	7. REFERENCES
16	NORMATIVE APPENDIX A: TEST DUCTS FOR MEASURING AIRFLOW RATE AND STATIC PRESSURE ON ALL DOWNFLOW UNITS AND THOSE UPFLOW UNITS IN LIMITED-HEIGHT TEST CHAMBER
18	NORMATIVE APPENDIX B: CLIMATE ZONE BIN DATA WITH POPULATION WEIGHTING
19	NORMATIVE APPENDIX C: TEST SETUP PACKAGED AHU FOR OUTDOOR INSTALLATION
20	NORMATIVE APPENDIX D: TEST SETUP REAR DOOR HEAT EXCHANGER
21	NORMATIVE APPENDIX E: SYSTEM CONFIGURATION
29	INFORMATIVE APPENDIX F: PERFORMANCE RATING TABLE FROM AHRI 1360

Additional information

Standard Title	ASHRAE Standard 127-2020 – Method of Testing for Rating Air-Conditioning Units Serving Data Center (DC) and Other Information Technology Equipment (ITE) Spaces (ANSI Approved)
Published Code	ASHRAE
Publication Date	2020

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ASHRAE Standard 127 2020

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