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4	FOREWORD FOREWORD 1. PURPOSE 1. PURPOSE 2. SCOPE 2. SCOPE 2.1 This standard covers testing under steady-state conditions for rating of indirect evaporative coolers that 2.1 This standard covers testing under steady-state conditions for rating of indirect evaporative coolers that 2.2 This standard does not cover 2.2 This standard does not cover 3. DEFINITIONS 3. DEFINITIONS
7	4. SYMBOLS AND SUBSCRIPTS 4. SYMBOLS AND SUBSCRIPTS 4.1 Symbols 4.1 Symbols
8	4.2 Subscripts 4.2 Subscripts 5. COMPLIANCE 5. COMPLIANCE 6. CLASSIFICATIONS 6. CLASSIFICATIONS 6.1 Component Indirect Evaporative Coolers (IEC Modules). This category includes any integrated air-to-air heat exchanger used a… 6.1 Component Indirect Evaporative Coolers (IEC Modules). This category includes any integrated air-to-air heat exchanger used a… 6.2 Semi-Packaged Secondary Indirect Evaporative Coolers (Semi-Packaged Secondary IEC Modules). This category includes any integ… 6.2 Semi-Packaged Secondary Indirect Evaporative Coolers (Semi-Packaged Secondary IEC Modules). This category includes any integ… 6.3 Semi-Packaged Primary Indirect Evaporative Coolers (Semi-Packaged Primary IEC Modules). This category includes any integrate… 6.3 Semi-Packaged Primary Indirect Evaporative Coolers (Semi-Packaged Primary IEC Modules). This category includes any integrate… 6.4 Packaged Indirect Evaporative Coolers (Packaged IEC). This category includes integrated or nonintegrated heat exchangers pro… 6.4 Packaged Indirect Evaporative Coolers (Packaged IEC). This category includes integrated or nonintegrated heat exchangers pro… 7. REQUIREMENTS 7. REQUIREMENTS 7.1 Airflow. All units subject to this standard shall have airflow rates measured for both primary and secondary airstreams. An exception to this requirement is granted only for IECUs meeting both of the following conditions: 7.1 Airflow. All units subject to this standard shall have airflow rates measured for both primary and secondary airstreams. An exception to this requirement is granted only for IECUs meeting both of the following conditions: 7.2 Temperature. The differential between entering primary dry-bulb and entering secondary wet-bulb temperatures shall be at least 20ËšF (11ËšC). 7.2 Temperature. The differential between entering primary dry-bulb and entering secondary wet-bulb temperatures shall be at least 20ËšF (11ËšC). 7.3 Determinations. A minimum of five determinations shall be required before a test report form may be completed. More may be r… 7.3 Determinations. A minimum of five determinations shall be required before a test report form may be completed. More may be r… 8. INSTRUMENTS 8. INSTRUMENTS 8.1 Temperature-Measuring Instruments. Temperature measurement and temperature-measuring instruments, unless noted below, shall be in accordance with ANSI/ASHRAE Standard 41.1, Standard Method for Temperature Measurement.3 8.1 Temperature-Measuring Instruments. Temperature measurement and temperature-measuring instruments, unless noted below, shall be in accordance with ANSI/ASHRAE Standard 41.1, Standard Method for Temperature Measurement.3
9	8.2 Pressure-Measuring Instruments 8.2 Pressure-Measuring Instruments 8.3 Airflow Measuring. The airflow rate shall be determined by measuring the pressure differential across the nozzle apparatus s… 8.3 Airflow Measuring. The airflow rate shall be determined by measuring the pressure differential across the nozzle apparatus s… 8.4 Power Determination. Power shall be determined by reaction dynamometer, the torque measured on a torsion element, or directly from a watt-meter connected to the device. All power devices shall have an accuracy of ±1% of the observed reading. 8.4 Power Determination. Power shall be determined by reaction dynamometer, the torque measured on a torsion element, or directly from a watt-meter connected to the device. All power devices shall have an accuracy of ±1% of the observed reading.
10	9. APPARATUS 9. APPARATUS 9.1 Temperature-Measuring Apparatus. The apparatus shall be the aspirated psychrometer with a sample tree shown in Figure 12. Th… 9.1 Temperature-Measuring Apparatus. The apparatus shall be the aspirated psychrometer with a sample tree shown in Figure 12. Th… 9.2 Airflow-Measuring Apparatus. The primary and secondary airflow rates through the indirect evaporative cooler unit shall be m… 9.2 Airflow-Measuring Apparatus. The primary and secondary airflow rates through the indirect evaporative cooler unit shall be m… 9.3 Pressure-Measuring Apparatus 9.3 Pressure-Measuring Apparatus
11	10. METHODS OF TESTING 10. METHODS OF TESTING 10.1 Preparation. The IECU to be tested shall be installed in the test section in accordance with the manufacturer’s standard in… 10.1 Preparation. The IECU to be tested shall be installed in the test section in accordance with the manufacturer’s standard in… 10.2 Measurements to Be Taken. Temperature, pressure, and electrical power measurements shall be taken simultaneously to establi… 10.2 Measurements to Be Taken. Temperature, pressure, and electrical power measurements shall be taken simultaneously to establi…
12	11. CALCULATION OF RESULTS 11. CALCULATION OF RESULTS 11.1 Calibration Correction. Calibration corrections, when required, shall be applied to individual readings before averaging or… 11.1 Calibration Correction. Calibration corrections, when required, shall be applied to individual readings before averaging or…
13	11.2 Density and Viscosity of Air 11.2 Density and Viscosity of Air 11.3 Airflow Rate at Test Conditions. The airflow rate shall be calculated from the pressure differential (DP) measured across a single nozzle or a bank of multiple nozzles. 11.3 Airflow Rate at Test Conditions. The airflow rate shall be calculated from the pressure differential (DP) measured across a single nozzle or a bank of multiple nozzles.
14	11.4 Cooling Effectiveness. The cooling effectiveness at test conditions is determined from 11.4 Cooling Effectiveness. The cooling effectiveness at test conditions is determined from 11.5 Cooling Capacity. Cooling capacity is based on the cooling of standard air at test conditions and can be calculated from 11.5 Cooling Capacity. Cooling capacity is based on the cooling of standard air at test conditions and can be calculated from 11.6 Total Power. Total power supplied to the cooling unit tested shall be the sum of the power provided to the motors of the fans for primary air (Wp), secondary air (Ws), recirculating pump (Wc), and appurtenances (Wa): 11.6 Total Power. Total power supplied to the cooling unit tested shall be the sum of the power provided to the motors of the fans for primary air (Wp), secondary air (Ws), recirculating pump (Wc), and appurtenances (Wa): 12. TEST REPORT 12. TEST REPORT 12.1 Performance Curves. At a minimum, results shall include performance curves for cooling capacity and electric power input. I… 12.1 Performance Curves. At a minimum, results shall include performance curves for cooling capacity and electric power input. I…
15	12.2 Data. The test report shall include the following data. 12.2 Data. The test report shall include the following data. 12.3 Information. The report shall contain the following information: 12.3 Information. The report shall contain the following information: 13. REFERENCES 13. REFERENCES
24	14. Tables 14. Tables
25	INFORMATIVE APPENDIX A- BIBLIOGRAPHY INFORMATIVE APPENDIX A- BIBLIOGRAPHY INFORMATIVE APPENDIX B- RATING REQUIREMENTS INFORMATIVE APPENDIX B- RATING REQUIREMENTS B1. Ratings B1. Ratings B1.1 Application ratings shall be derived from IECU ratings that have been obtained in accordance with this standard. B1.1 Application ratings shall be derived from IECU ratings that have been obtained in accordance with this standard. B1.2 Application ratings outside the “Range of Standard Rating Conditions” shown in Table C-1 may be published, provided that such ratings are clearly distinguishable from standard ratings and are accompanied by the following explanatory note: B1.2 Application ratings outside the “Range of Standard Rating Conditions” shown in Table C-1 may be published, provided that such ratings are clearly distinguishable from standard ratings and are accompanied by the following explanatory note: B1.3 Application ratings may be presented in the form of curves, tables, or charts. B1.3 Application ratings may be presented in the form of curves, tables, or charts. INFORMATIVE APPENDIX C- RATING PROVISIONS INFORMATIVE APPENDIX C- RATING PROVISIONS C1. Tabular Performance Data C1. Tabular Performance Data C1.1 Rows. The performance data shall be presented in the form of a table. The horizontal rows shall be labeled wet-bulb temperature and variable-airstream standard airflow rates. C1.1 Rows. The performance data shall be presented in the form of a table. The horizontal rows shall be labeled wet-bulb temperature and variable-airstream standard airflow rates. C1.2 Columns C1.2 Columns
26	C1.3 Data Contained in Table C1.3 Data Contained in Table C1.4 Identification. Tabular data sheets shall list the following information. C1.4 Identification. Tabular data sheets shall list the following information. C1.5 Interpolation. Values of capacity and leaving air temperature that lie between test data may be generated by interpolation. A curve-fitting algorithm shall be used to ensure that results follow the test data curve. C1.5 Interpolation. Values of capacity and leaving air temperature that lie between test data may be generated by interpolation. A curve-fitting algorithm shall be used to ensure that results follow the test data curve. C1.6 Configuration Classification. All information shall be in accordance with one of four possible classifications as defined i… C1.6 Configuration Classification. All information shall be in accordance with one of four possible classifications as defined i… C1.7 Extrapolation. Values of capacity and leaving air temperature that lie below or above test data shall not be published. Extrapolation of curves beyond test data limits is prohibited. C1.7 Extrapolation. Values of capacity and leaving air temperature that lie below or above test data shall not be published. Extrapolation of curves beyond test data limits is prohibited. C1.8 Standard Rating Conditions. The standard applications ratings shall be shown within the ranges of operating conditions specified in Table C-1. The standard base rating condition for comparison purposes shall be as specified for conditions 1 and 2. C1.8 Standard Rating Conditions. The standard applications ratings shall be shown within the ranges of operating conditions specified in Table C-1. The standard base rating condition for comparison purposes shall be as specified for conditions 1 and 2. RATING TABLE C-1 Rate of Standard Rating Conditions RATING TABLE C-1 Rate of Standard Rating Conditions

Published By	Publication Date	Number of Pages
ASHRAE	2007	30


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Standard Title	ASHRAE Standard 143-2007 Method of Test for Rating Indirect Evaporative Coolers (ANSI Approved)
Published Code	ASHRAE
Publication Date	2007
Pages Count	30

ASHRAE 143 07:2007 Edition

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