ASHRAE Standard 37 2009 RA2019
$38.46
ASHRAE Standard 37-2009 (RA 2019) – Methods of Testing for Rating Electrically Driven Unitary Air-Conditioning and Heat Pump Equipment
| Published By | Publication Date | Number of Pages |
| ASHRAE | 2009 | 32 |
Standard 37 provides test methods for determining the cooling capacity of unitary air-conditioning equipment and the cooling or heating capacities, or both, of unitary heat-pump equipment. The 2019 reaffirmation of Standard 37 includes no substantive changes.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | ANSI/ASHRAE Standard 37-2009 (RA 2019) |
| 3 | CONTENTS |
| 4 | FOREWORD 1. PURPOSE 1.1 The purpose of this standard is to provide test methods for determining the cooling capacity of unitary air conditioning equipment and the cooling or heating capacities, or both, of unitary heat pump equipment. 1.2 These test methods do not specify methods of establishing ratings that involve factors such as manufacturing tolerances and quality control procedures. 2. SCOPE 2.1 This standard applies to electrically driven mechanical-compression unitary air conditioners and heat pumps consisting of one or more assemblies that include an indoor air coil(s), a compressor(s), and an outdoor coil(s). Where such equipment is … 2.2 This standard does not include methods of testing the following: 3. DEFINITIONS 4. CLASSIFICATIONS 4.1 Component Arrangement 4.2 Method of Outdoor Coil Heat Exchange 5. INSTRUMENTS 5.1 Temperature Measuring Instruments |
| 5 | 5.2 Refrigerant, Liquid, and Barometric Pressure Measuring Instruments 5.3 Air Differential Pressure and Airflow Measurements 5.4 Electrical Instruments 5.5 Volatile Refrigerant Flow Measurement 5.6 Liquid Flow Measurement 5.7 Speed Measuring Instruments 5.8 Time and Mass Measurements 5.9 Volatile refrigerant mass composition measurements for zeotropic refrigerants shall be made using an instrument that is in accordance with ARI Standard 700-95.4 6. AIRFLOW AND AIR DIFFERENTIAL PRESSURE MEASUREMENT APPARATUS 6.1 Enthalpy Apparatus. Recommended configurations for the test apparatus are provided below. In all cases, suitable means for determining the dry-bulb temperature and water vapor content of the air entering and leaving the unit and for measuring the… |
| 6 | Figure 1 Tunnel air enthalpy test method arrangement. Figure 2 Loop air enthalpy test method arrangement. |
| 7 | Figure 3 Calorimeter air enthalpy test method arrangement. 6.2 Nozzle Airflow Measuring Apparatus |
| 8 | Figure 4 Room air enthalpy test method arrangement. Figure 5 Nozzle airflow measuring apparatus. |
| 9 | Figure 6 Construction of a nozzle. 6.3 Nozzles 6.4 External Static Pressure Measurements |
| 10 | Figure 7a External static pressure measurement. Note: The following statements apply to Figures 7 and 8. 1. For circular ducts, substitute for C ´ D and for A ´ B. 2. The length of the inlet duct, , is a minimum dimension. For more precise results, use . 6.5 Recommended Practices for Static Pressure Measurements 6.6 Duct Insulation and Sealing Requirements 7. METHODS OF TESTING AND CALCULATION 7.1 Standard Test Methods. The following five test methods for measuring space conditioning capacity are covered in this standard: 7.2 Applicability of Test Methods |
| 11 | Figure 7b External static pressure measurement. 7.3 Indoor and Outdoor Air Enthalpy Methods |
| 12 | Figure 7c External static pressure measurement. |
| 13 | Figure 8 Air static pressure drop measurement for coil (without fan). Figure 9 Recommended connection options for static pressure taps. |
| 14 | Table 1 Applicable Test Methods |
| 15 | 7.4 Compressor Calibration Method |
| 16 | 7.5 Refrigerant Enthalpy Method |
| 17 | 7.6 Outdoor Liquid Coil Method |
| 18 | 7.7 Airflow Rate Measurement |
| 19 | Figure 10 Modified airflow measurement apparatus. Notes: 1. Air mixing and temperature measurement shall be in accordance with ANSI/ASHRAE Standard 41.1.1 2. Heat loss from the enclosure shall be less than 1.0% of the heat input to the heat source. 3. Minimum temperature rise (ta5 – ta2) across th… 7.8 Cooling Condensate Measurement 8. TEST PROCEDURES 8.1 Test Room Requirements |
| 20 | 8.2 Equipment Installation 8.3 Airflow Measurements 8.4 External Resistance Measurement 8.5 Temperature Measurement 8.6 Additional Requirements for the Outdoor Air Enthalpy Method |
| 21 | 8.7 Test Procedure for Cooling Capacity Tests 8.8 Test Operating Procedure for Heating Capacity Tests |
| 22 | Table 2a Test Tolerances (SI Units) Table 2b Test Tolerances (I-P Units) |
| 24 | 9. DATA TO BE RECORDED 9.1 Table 3 shows the data to be recorded during a test. Items indicated by a ü under the test method columns, or their equivalents, are required when that test method is employed. 9.2 Test Tolerances 10. TEST RESULTS 10.1 Capacity Test Requirements |
| 25 | Table 3 Data to be Recorded |
| 26 | 11. SYMBOLS USED IN EQUATIONS 11.1 The significance of terms used in this standard is as follows: |
| 27 | 12. REFERENCE PROPERTIES AND DATA 12.1 Thermodynamic Properties of Air 12.2 Thermodynamic Properties of (Sink and Source) Liquids 12.3 Thermodynamic Properties of Volatile Refrigerants 13. REFERENCES |
| 29 | INFORMATIVE APPENDIX A: CLASSIFICATIONS OF UNITARY AIR CONDITIONERS AND HEAT PUMPS Table A-1 Classification of Unitary Air Conditioners |
| 30 | Table A-2 Classification of Air-Source Unitary Heat Pumps |
