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, 2024
- ASHRAE Online Bookstore
- Addenda
- Errata
- Return to Previous Page
- ANSI/ASHRAE Standard 143-2024 [Go to Page]
- Contents
- Foreword
- 1. Purpose
- 2. Scope [Go to Page]
- 2.1 This standard applies to testing indirect evaporative air coolers operating at steady-state conditions that
- 2.2 This standard does not apply to
- 3. Terminology and Symbols [Go to Page]
- 3.1 Definitions
- 3.2 Symbols
- 4. Classifications [Go to Page]
- 4.1 Component Indirect Evaporative Coolers (IEC Modules). This category includes any integrated air- to-air heat exchanger used as an indirect evaporative cooler without air-moving devices for the primary and secondary airstreams. More specifically, ...
- 4.2 Semipackaged Secondary Indirect Evaporative Coolers (Semipackaged Secondary IEC Modules). This category includes any integrated heat exchanger or nonintegrated heat exchanger used as an indirect evaporative cooler with no primary air-moving devic...
- 4.3 Semipackaged Primary Indirect Evaporative Coolers (Semipackaged Primary IEC Modules). This category includes any integrated heat exchanger used as an indirect evaporative cooler with no secondary air-moving device. A primary air-moving device is ...
- 4.4 Packaged Indirect Evaporative Coolers (Packaged IEC). This category includes integrated or nonintegrated heat exchangers provided with primary and secondary air-moving devices and with all other necessary equipment evaporatively cooled primary ai...
- 5. Requirements [Go to Page]
- 5.1 Airflow. All units subject to this standard shall have airflow rates simultaneously measured for both primary and secondary airstreams except where the device is classified as an indirect evaporative cooler with a nonintegrated heat exchanger as ...
- 5.2 Temperature Difference. The difference between entering primary dry-bulb temperature and entering secondary wet-bulb temperature shall be greater than 11°C (20°F).
- 5.3 Determinations. The number of determinations required to establish the performance of an IEC over the range from shutoff to free delivery shall be established depending on the shapes of the various characteristic curves. Plans shall be made to va...
- 5.4 Test Data Processing. Data point measurements collected during the duration of the testing period shall be processed to calculate sample mean and sample standard deviation.
- 5.5 Thermodynamic Properties of Air. Dry- and moist-air properties shall be obtained from or agree with ASHRAE RP-1485.1
- 5.6 Airflow Leakage Requirement. Measured airflow leakage into or out of the test apparatus shall not be greater than 0.25% of the airflow at the leak test pressure that is equal to the maximum operating pressure.
- 6. Instruments and Measurement Methods [Go to Page]
- 6.1 Instrument Calibrations. Measurements from the instruments shall be traceable to primary or secondary standards calibrated by the National Institute of Standards and Technology (NIST) or to the Bureau International des Poids et Mesures (BIPM) if ...
- 6.2 Instrument Accuracy Requirements and Measurement Methods. Measuring instruments shall be selected to meet or exceed the instrument accuracy listed in Table 2 for each type of measurement. Instruments and measurement methods shall comply with the ...
- 6.3 Airflow Measurement. Apply ANSI/ASHRAE Standard 41.26 to measure volumetric airflow and standard volumetric airflow using a single-nozzle or multiple-nozzle test chamber.
- 6.4 Static Pressure Measurement in Ducts or Chambers. Static pressure in ducts or chambers shall be measured in accordance with the static pressure tap geometry and the piezometer ring specifications in Standard 41.2,2 Section 8.
- 6.5 Air-Inlet Temperature Sampling Apparatus. Use an air-sampling apparatus and a wet-bulb psychrometer that is constructed as illustrated in Figure 8 to obtain the air-inlet dry-bulb and wet-bulb temperature. The sample tree shall sample at least ni...
- 7. Test Setup [Go to Page]
- 7.1 Indirect Evaporative Coolers (IEC Module) Test Setup. Figure 9 shows a schematic of the test setup for an IEC module.
- 7.2 Semipackaged Secondary Indirect Evaporative Coolers (Semipackaged Secondary IEC Modules) Test Setup and Equipment. Figure 10 is a schematic of the test setup for a semipackaged secondary IEC module.
- 7.3 Semipackaged Primary Indirect Evaporative Coolers (Semipackaged Primary IEC Modules) Test Setup and Equipment. Figure 11 is a schematic of the test setup for a semipackaged primary IEC module.
- 8. Test Data to Be Recorded [Go to Page]
- 8.1 Test IEC. The description of the test indirect evaporative cooler 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 proof of calibration shall be...
- 8.3 Test Data. Where applicable, test data for each determination shall be recorded at each point of operation that satisfies the stability criteria. Readings shall be made simultaneously.
- 9. Calculations [Go to Page]
- 9.1 IEC Standard Airflow Rate. Apply ANSI/ASHRAE Standard 41.26 to calculate the primary and secondary standard volumetric airflow rates: Qstdp, m3/s (scfm) and Qstds, m3/s (scfm).
- 9.2 IEC Effectiveness. Apply Equation 9 to determine the IEC effectiveness at each test point of operation that satisfies the stability criteria.
- 9.3 IEC Standard Sensible Cooling Capacity
- 9.4 IEC Coefficient of Performance (COP) and Energy Efficiency Ratio (EER)
- 10. Test Report [Go to Page]
- 10.1 Performance data shall be provided in a spreadsheet. If the IEC is not supplied with a pump or rotary device, a description of the method of supplying the water and the flow rate of water delivered to the IEC shall be included.
- 10.2 Performance Curves. The following IEC test results shall be presented as performance curves:
- 11. References
- Informative Appendix A: Informative References [Go to Page]
