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4	FOREWORD FOREWORD 1. PURPOSE 1. PURPOSE 2. SCOPE 2. SCOPE 2.1 The scope of this standard covers a method of testing for rating the saturation effectiveness, airflow rate, and total power of packaged and component direct evaporative air coolers. 2.1 The scope of this standard covers a method of testing for rating the saturation effectiveness, airflow rate, and total power of packaged and component direct evaporative air coolers. 2.2 Covered tests also include the methods for measuring the static pressure differential of the direct evaporative air cooler, density of the air, and speed of rotation of the fan. 2.2 Covered tests also include the methods for measuring the static pressure differential of the direct evaporative air cooler, density of the air, and speed of rotation of the fan. 2.3 This standard requires that packaged and component direct evaporative air coolers be simultaneously tested for airflow, total power, and saturation effectiveness. 2.3 This standard requires that packaged and component direct evaporative air coolers be simultaneously tested for airflow, total power, and saturation effectiveness. 2.4 The ratings resulting from application of this standard are intended for use by manufacturers, specifiers, installers, and users of evaporative air cooling apparatus for residential, commercial, agricultural, and industrial ventilation; for air c… 2.4 The ratings resulting from application of this standard are intended for use by manufacturers, specifiers, installers, and users of evaporative air cooling apparatus for residential, commercial, agricultural, and industrial ventilation; for air c… 3. DEFINITIONS and ACRONYMS 3. DEFINITIONS and ACRONYMS
5	4. SYMBOLS AND SUBSCRIPTS 4. SYMBOLS AND SUBSCRIPTS 4.1 Symbols 4.1 Symbols 4.2 Subscripts 4.2 Subscripts
6	5. Requirements 5. Requirements 5.1 Determinations. The number of determinations required to establish the performance of an evaporative cooling unit over the range from shutoff to free delivery shall be established depending on the shapes of the various characteristic curves. Plan… 5.1 Determinations. The number of determinations required to establish the performance of an evaporative cooling unit over the range from shutoff to free delivery shall be established depending on the shapes of the various characteristic curves. Plan… 5.2 Equilibrium. Equilibrium conditions shall be established before each determination. To test for equilibrium, trial observations shall be made until steady readings are obtained. Ranges of air delivery over which equilibrium cannot be established … 5.2 Equilibrium. Equilibrium conditions shall be established before each determination. To test for equilibrium, trial observations shall be made until steady readings are obtained. Ranges of air delivery over which equilibrium cannot be established … 5.3 Stability. Any bi-stable performance points (airflow rates at which two different ECU static pressure differentials are be measured) shall be so reported. When they are a result of hysteresis, the points shall be identified as that for increasing… 5.3 Stability. Any bi-stable performance points (airflow rates at which two different ECU static pressure differentials are be measured) shall be so reported. When they are a result of hysteresis, the points shall be identified as that for increasing… 5.4 Acceptable Temperature and Humidity Test Conditions. Inlet plenum air dry-bulb temperature (td0) shall be 46°C (115°F) maximum, the wet-bulb temperature (twb) shall be 5°C (41°F) minimum, and the wet-bulb depression shall be 11°C (20°F) min… 5.4 Acceptable Temperature and Humidity Test Conditions. Inlet plenum air dry-bulb temperature (td0) shall be 46°C (115°F) maximum, the wet-bulb temperature (twb) shall be 5°C (41°F) minimum, and the wet-bulb depression shall be 11°C (20°F) min… 5.5 Acceptable Water Quality. Conductivity of the water shall be measured using a conductivity meter. The conductivity of the water supplied to the distribution header shall be between 350 and 3500 µS. (microsiemens). 5.5 Acceptable Water Quality. Conductivity of the water shall be measured using a conductivity meter. The conductivity of the water supplied to the distribution header shall be between 350 and 3500 µS. (microsiemens). 5.6 Entrainment Verification. Precautions shall be taken to ensure water entrainment is not occurring in equipment being tested for rating. Water entrainment will obviously affect temperature measurements; therefore, any water entrainment shall inval… 5.6 Entrainment Verification. Precautions shall be taken to ensure water entrainment is not occurring in equipment being tested for rating. Water entrainment will obviously affect temperature measurements; therefore, any water entrainment shall inval… 6. INSTRUMENTS AND METHODS OF MEASUREMENT 6. INSTRUMENTS AND METHODS OF MEASUREMENT 6.1 Temperature-Measurement. Temperature measurement and temperature-measuring instruments, unless noted below, shall conform to the requirements of ANSI/ASHRAE Standard 41.1, Standard Method for Temperature Measurement.1 6.1 Temperature-Measurement. Temperature measurement and temperature-measuring instruments, unless noted below, shall conform to the requirements of ANSI/ASHRAE Standard 41.1, Standard Method for Temperature Measurement.1 6.2 Pressure-Measurement. Other than barometric pressure, static pressure in ducts or chambers shall be measured with special taps designed to eliminate velocity effects. Each location requiring a static pressure measurement shall use a minimum of fo… 6.2 Pressure-Measurement. Other than barometric pressure, static pressure in ducts or chambers shall be measured with special taps designed to eliminate velocity effects. Each location requiring a static pressure measurement shall use a minimum of fo… 6.3 Airflow Measurement. The airflow rate shall be determined by measuring the pressure differential across elliptical flow nozzles in chambers as shown in Figure 1. Determinations shall be in accordance with ASHRAE Standard 41.2, Standard Methods fo… 6.3 Airflow Measurement. The airflow rate shall be determined by measuring the pressure differential across elliptical flow nozzles in chambers as shown in Figure 1. Determinations shall be in accordance with ASHRAE Standard 41.2, Standard Methods fo…
7	6.4 Power. Power shall be measured using a wattmeter connected to the ECU. Wattmeters shall have an accuracy of ±1.0% of observed reading. 6.4 Power. Power shall be measured using a wattmeter connected to the ECU. Wattmeters shall have an accuracy of ±1.0% of observed reading. 6.5 Water Flow. Water flow shall be measured using a totalizing water meter connected to the ECU and a timing device to determine the rate of water flow. Water meters shall have an accuracy of ±5.0% of observed reading. 6.5 Water Flow. Water flow shall be measured using a totalizing water meter connected to the ECU and a timing device to determine the rate of water flow. Water meters shall have an accuracy of ±5.0% of observed reading. 6.6 Speed. Speed shall be measured with a revolution counter and chronometer, a stroboscope counter and chronometer, a precision instantaneous tachometer, an electronic counter- timer, or any other device that has a demonstrated accuracy of ±0.5% of… 6.6 Speed. Speed shall be measured with a revolution counter and chronometer, a stroboscope counter and chronometer, a precision instantaneous tachometer, an electronic counter- timer, or any other device that has a demonstrated accuracy of ±0.5% of… 6.7 Water Conductivity. Water conductivity shall be measured using a conductivity meter having an accuracy ±10% of observed reading. The meter shall have a means for temperature compensation. 6.7 Water Conductivity. Water conductivity shall be measured using a conductivity meter having an accuracy ±10% of observed reading. The meter shall have a means for temperature compensation. 7. EQUIPMENT AND SETUP 7. EQUIPMENT AND SETUP 7.1 Setup. The suggested setup is shown in Figure B-1. 7.1 Setup. The suggested setup is shown in Figure B-1. 7.2 Ducts. Short ducts that are used to simulate outlet duct work, shall be between 2 and 3 equivalent diameters in length and have an area ± 0.5% of the outlet area and a uniform shape to fit the outlet. 7.2 Ducts. Short ducts that are used to simulate outlet duct work, shall be between 2 and 3 equivalent diameters in length and have an area ± 0.5% of the outlet area and a uniform shape to fit the outlet. 7.3 Chambers. A chamber shall be incorporated in a laboratory setup to provide a measuring station or to simulate the conditions the ECU is expected to encounter in service or both. Such a chamber shall have a circular or rectangular cross-sectional … 7.3 Chambers. A chamber shall be incorporated in a laboratory setup to provide a measuring station or to simulate the conditions the ECU is expected to encounter in service or both. Such a chamber shall have a circular or rectangular cross-sectional …
8	7.4 Point of Operation. A means of varying the point of operation shall be provided in the laboratory setup. 7.4 Point of Operation. A means of varying the point of operation shall be provided in the laboratory setup. 8. data to be recorded 8. data to be recorded 8.1 Test ECU. The description of the test ECU shall be recorded. The nameplate data shall be copied. Dimensions shall be checked against a drawing and a copy of the drawing attached to the data. 8.1 Test ECU. The description of the test ECU shall be recorded. The nameplate data shall be copied. Dimensions shall be checked against a drawing and a copy of the drawing attached to the data. 8.2 Test Setup. The description of the test setup, including specific dimensions, shall be recorded. The instruments and apparatus used in the test shall be listed. Names, model numbers, serial numbers, scale ranges, and calibration information shall… 8.2 Test Setup. The description of the test setup, including specific dimensions, shall be recorded. The instruments and apparatus used in the test shall be listed. Names, model numbers, serial numbers, scale ranges, and calibration information shall… 8.3 Test Data. Test data for each determination shall be recorded. Readings shall be made simultaneously whenever possible. 8.3 Test Data. Test data for each determination shall be recorded. Readings shall be made simultaneously whenever possible. 8.4 Personnel. The names of test personnel shall be listed with the data for which they are responsible. 8.4 Personnel. The names of test personnel shall be listed with the data for which they are responsible. 9. CALCULATIONS 9. CALCULATIONS 9.1 Calibration Correction. Calibration corrections, when required, shall be applied to individual readings before averaging or other calculations. Calibration corrections need not be made if the correction is smaller than one-half the maximum allowa… 9.1 Calibration Correction. Calibration corrections, when required, shall be applied to individual readings before averaging or other calculations. Calibration corrections need not be made if the correction is smaller than one-half the maximum allowa… 9.2 Density and Viscosity of Air 9.2 Density and Viscosity of Air 9.3 ECU Airflow Rate at Test Conditions 9.3 ECU Airflow Rate at Test Conditions
9	9.4 ECU Power Input at Test Conditions. The total power input to the test unit is the sum of fan and pump or rotary device power and appurtenance device power: 9.4 ECU Power Input at Test Conditions. The total power input to the test unit is the sum of fan and pump or rotary device power and appurtenance device power: 9.5 Saturation Effectiveness. The saturation effectiveness shall be calculated as follows: 9.5 Saturation Effectiveness. The saturation effectiveness shall be calculated as follows: 9.6 ECU Static Pressure Differential. The ECU static pressure differential (DPECU) shall be the static pressure differential between plane 0 and plane 1: 9.6 ECU Static Pressure Differential. The ECU static pressure differential (DPECU) shall be the static pressure differential between plane 0 and plane 1:
10	10. Performance Corrections to Nominal or Standard Airflow Rate AND SPEED 10. Performance Corrections to Nominal or Standard Airflow Rate AND SPEED 10.1 Standard Saturation Effectiveness. Standard saturation effectiveness, based on constant volumetric airflow, shall be calculated from the test data as follows: 10.1 Standard Saturation Effectiveness. Standard saturation effectiveness, based on constant volumetric airflow, shall be calculated from the test data as follows: 10.2 ECU Standard Static Pressure Differential. The standard static pressure differential of the ECU shall be calculated as follows: 10.2 ECU Standard Static Pressure Differential. The standard static pressure differential of the ECU shall be calculated as follows: 10.3 Fan Standard Power 10.3 Fan Standard Power 10.4 ECU Standard Power Input 10.4 ECU Standard Power Input 10.5 Correction to Nominal Fan Speed at Standard Density. During a laboratory test, speed of rotation may vary slightly from one determination to another. Equations 26, 27, and 28 shall be used to convert the results calculated for test conditions to… 10.5 Correction to Nominal Fan Speed at Standard Density. During a laboratory test, speed of rotation may vary slightly from one determination to another. Equations 26, 27, and 28 shall be used to convert the results calculated for test conditions to… 11. REPORT AND RESULTS OF TEST 11. REPORT AND RESULTS OF TEST 11.1 Report. The report of a laboratory evaporative cooler test shall include object, results, test data, and descriptions of the evaporative cooler, including appurtenances, test setup, and test instruments as outlined in Section 8. The test baromet… 11.1 Report. The report of a laboratory evaporative cooler test shall include object, results, test data, and descriptions of the evaporative cooler, including appurtenances, test setup, and test instruments as outlined in Section 8. The test baromet… 11.2 Performance Curves. The results of an ECU test shall be presented as performance curves. All information, except airflow and water flow, shall be published at standard air density and be clearly identified as such. 11.2 Performance Curves. The results of an ECU test shall be presented as performance curves. All information, except airflow and water flow, shall be published at standard air density and be clearly identified as such.
11	12. FIGURES 12. FIGURES Figure 1 Airflow-measuring apparatus from setup in Figure B-1 (shown without throat taps or air-sampling device). Figure 1 Airflow-measuring apparatus from setup in Figure B-1 (shown without throat taps or air-sampling device). Figure 2 Details of orientation of elbows for down draft ECUs from Figure 1. Figure 2 Details of orientation of elbows for down draft ECUs from Figure 1.
12	Figure 3 Static pressure tap. Figure 3 Static pressure tap. Figure 4 Air-sampling device. Figure 4 Air-sampling device.
13	13. REFERENCES 13. REFERENCES Informative APPENDIX A— BIBLIOGRAPHY Informative APPENDIX A— BIBLIOGRAPHY
14	informative appendix B— additional figures informative appendix B— additional figures Figure B-1 Suggested setup for testing direct evaporative coolers. Figure B-1 Suggested setup for testing direct evaporative coolers.
15	Figure B-2a Typical performance curve format for packaged ECU reported at constant speed. Figure B-2a Typical performance curve format for packaged ECU reported at constant speed.
16	Figure B-2b Typical performance curve format for packaged ECU reported with varying speed. Figure B-2b Typical performance curve format for packaged ECU reported with varying speed.
17	Figure B-3 Typical performance curve format for component ECU. Figure B-3 Typical performance curve format for component ECU.
18	Figure B-4 Typical report format for packaged ECU. Figure B-4 Typical report format for packaged ECU.
19	Figure B-4 Typical report format for packaged ECU (continued). Figure B-4 Typical report format for packaged ECU (continued).
20	Figure B-5 Typical report format for component ECU. Figure B-5 Typical report format for component ECU.
21	Figure B-5 Typical report format for component ECU (continued). Figure B-5 Typical report format for component ECU (continued). Figure B-6 Illustration of a packaged direct-evaporative air cooler (ECU). Figure B-6 Illustration of a packaged direct-evaporative air cooler (ECU).
22	Figure B-7 Illustration of a component direct-evaporative air cooler (ECU). Figure B-7 Illustration of a component direct-evaporative air cooler (ECU).

Published By	Publication Date	Number of Pages
ASHRAE	2008	24


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Standard Title	ASHRAE Standard 133-2008 Method of Testing Direct Evaporative Air Coolers (ANSI/ASHRAE Approved)
Published Code	ASHRAE
Publication Date	2008
Pages Count	24

ASHRAE 133 08:2008 Edition

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