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ASHRAE 127 2012

ASHRAE 127 2012

$21.13

ASHRAE Standard 127-2012 Method of Testing for Rating Computer and Data Processing Room Unitary Air Conditioners

Published By Publication Date Number of Pages
ASHRAE 2012 16
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The purpose of the standard is to establish a uniform set of requirements for rating computer and data processing room (CDPR) unitary air conditioners. This 2012 revision of the standard makes some significant changes to the 2007 edition: (1) The standard has been modified to cover four different product application classifications. This reflects the industry need to modify equipment to accept higher and higher return temperatures, thus increasing efficiency. (2) The chilled-water conditions have been adjusted on the chilled-water air handlers to emphasize the higher system efficiency when higher temperatures are used, even though the specific units involved will appear to be lower in capacity and efficiency. (3) The acronym “SCOP” was exchanged as this is currently used within 90.1 with a different meaning. (4) A term and testing/rating procedure for equipment covered by Standard 127 was established that is similar to the term iEER now being used in Standard 90.1. (5) A testing/rating procedure for the newer technologies now being deployed within computer rooms such as “row based cooling systems” and enclosed cabinet cooling was established.

PDF Catalog

PDF Pages PDF Title
4 FOREWORD
Definitions
Rating Requirements
1. PURPOSE
2. SCOPE
3. DEFINITIONS
5 4. CLASSIFICATION
4.1 Normally, CDPR units within the scope of this standard can be classified as shown below. There are five basic types of unitary air conditioners:
5. RATING REQUIREMENTS
5.1 Cooling System Standard Capacity Ratings. Rated cooling is defined as 100% of the unit’s max capacity and is sometimes referred to as standard rating. Standard rating capacity shall be established at the standard rating conditions specified in …
7 5.2 Unit Efficiency Calculations
8 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 Table 1. Reheating tests are conducted without operating the cooling or humidifying portions of the air conditioner. Operations in a re…
5.5 Humidification and Dehumidification System Standard Ratings. Standard ratings shall be established at the rating conditions specified in Table 1.
5.6 Air Filter Standard Ratings. Published air filter ratings shall be those defined in ASHRAE Standard 52.2.5 At any test condition described by this standard, the system shall be tested with clean filters of the manufacturer’s choice. Optional fi…
5.7 Application Ratings. Capacity ratings and iNSenCOP values at conditions of temperature, humidity, or altitude other than those specified in Section 5.1.4 may be published as application ratings and shall be based on calculations or tests using te…
9 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. Two or three measurement positions are required for each unit depending on the unit configuration as s…
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
7. REFERENCES
10 Normative Annex A— Tests Required
A1. Air-Cooled Units
A1.1 Cooling capacity at condition Rated Cooling A in Table 1
A1.2 Unit efficiency test at conditions Rated Cooling A, B, C, and D in Table 1
A1.3 Dehumidification capacity test
A1.4 Humidification capacity test
A2. Water-Cooled Units
A2.1 Cooling capacity at condition Rated Cooling A in Table 1
A2.2 Unit efficiency test at conditions Rated Cooling A, B, C, and D in Table 1
A2.3 Dehumidification capacity test
A2.4 Humidification capacity test
A3. Glycol-Cooled Units
A3.1 Cooling capacity at condition Rated Cooling A in Table 1
A3.2 Unit efficiency test at conditions Rated Cooling A, B, C, and D in Table 1
A3.3 Dehumidification capacity test
A3.4 Humidification capacity test
A4. Chilled-Water Units
A4.1 Cooling capacity at condition Rated Cooling A in Table 1
A4.2 Unit efficiency test at conditions Rated Cooling A, B, C, and D in Table 1
A4.3 Dehumidification capacity test
A4.4 Humidification capacity test
11 Normative Annex B— test procedure for measuring Airflow and Static Pressure ON DownFlow Units
12 (This is a normative annex and is part of this standard.)
Normative Annex C— Climate Zone Bin Data with Population Weighting
13 Informative Annex D Comparison of Test Results (Simulated)

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ASHRAE 127 2012
$21.13