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, 2024
- ASHRAE Online Bookstore
- Addenda
- Errata
- Return to Previous Page in Document
- ANSI/ASHRAE Standard 37-2024 [Go to Page]
- Contents
- Foreword
- 1. Purpose [Go to Page]
- 1.1 This standard provides test methods and calculations for steady-state, cyclic, and part-load performance and methods for establishing seasonal performance for unitary air-conditioning and heat pump equipment, including single capacity, multiple c...
- 2. Scope [Go to Page]
- 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 [Go to Page]
- 4.1 Component Arrangement
- 4.2 Method of Outdoor Coil Heat Exchange
- 5. Instruments and Measurement Apparatus [Go to Page]
- 5.1 General
- 5.2 Pressure Instruments
- 5.3 Electrical Instruments
- Table 1 Instrument Accuracy
- 5.4 Air Measurement
- Figure 1 Example air sampling tree.
- 5.5 Thermopile Grid and Thermocouple Grid
- 5.6 Nozzle Airflow Measuring Apparatus. Nozzle airflow measuring apparatus shall be in accordance with ANSI/ASHRAE Standard 41.2 2 or as follows:
- Figure 2 Aspirating psychrometer.
- Figure 3 Nozzle airflow measuring apparatus.
- 6. Test Facility Arrangements [Go to Page]
- 6.1 The test facility arrangements shown in Figures 4, 5, 6, 7, and 8 illustrate various possible configurations and shall not be construed as applying specifically or solely to the types of equipment shown.
- Figure 4 Tunnel air enthalpy arrangement.
- Figure 5 Loop air enthalpy arrangement.
- 6.2 Enthalpy Measurement Apparatus. Configurations for the test apparatus are provided in the following sections. In all cases, a means for determining the dry-bulb temperature and water-vapor content of the air entering and leaving the unit and for ...
- Figure 6 Calorimeter air enthalpy arrangement.
- Figure 7 Room air enthalpy arrangement.
- Figure 8 Multisplit, multiroom arrangement.
- Figure 9 Simplified diagram of enthalpy and pressure measurement apparatus.
- Table 2 Enthalpy and Pressure Measurement Apparatus (Figure 9) Reference Sections
- Figure 10 Determination of measurement rectangles and required number of air sampling trees.
- Figure 11 Example test setup configurations.
- Figure 12 Single module air sampling tree placement example.
- Figure 13 Multiple module air sampling tree placement example.
- 6.3 Cyclic Damper (Optional)
- 6.4 External Static Pressure Measurement Apparatus Several configurations for the test apparatus are provided in the sections that follow. In all cases, a means for determining the airflow and differential pressure shall be provided.
- Figure 14 Connection options for static pressure taps.
- Figure 15 External static pressure measurement for equipment outlet.
- Figure 16 External static pressure measurement.
- Figure 17 External static pressure measurement.
- Figure 18 Alternate ductwork from RP-1581. Details are defined in Sections 6.4.2 and 6.4.3.
- Figure 19 Example upturned duct. Details are defined in Section 6.3.5.
- Figure 20 Air static pressure drop measurement for coil (without fan).
- Figure 21 Example indoor units installation based on different static pressures.
- Table 3 Maximum Diameter of Outlet Plenum
- Figure 22 Example setup for high wall mounted indoor units.
- 7. Methods of Testing and Calculation [Go to Page]
- 7.1 Standard Test Methods. The following five test methods for measuring space conditioning capacity are covered in this standard:
- Figure 23 Example return air measurement setup for nonducted units, sampling tree at unit.
- Figure 24 Example return air measurement setup for nonducted units, sampling tree common.
- Figure 25 Example return air measurement setup for ceiling cassette.
- Figure 26 Example indoor units installation for IDUs of same chassis size.
- Figure 28 Schematic of example test setup for ducted indoor units with common duct.
- 7.2 Applicability of Test Methods
- 7.3 Indoor and Outdoor Air Enthalpy Methods
- Table 4 Applicable Test Methods
- 7.4 Compressor Calibration Method
- 7.5 Refrigerant Enthalpy Method
- 7.6 Outdoor Liquid Coil Method
- 7.7 Airflow Rate Measurement
- Figure 29 Modified airflow measurement apparatus. Notes: 1. Air mixing and temperature measurement shall be in accordance with ANSI/ASHRAE Standard 41.1-2013.8 2. Heat loss from the enclosure shall be less than 1.0% of the heat input to the heat sour...
- 7.8 Cooling Condensate Measurement
- 8. Test Procedures [Go to Page]
- 8.1 Test Room Requirements
- 8.2 Equipment Installation
- 8.3 Airflow Measurements
- 8.4 External Static Pressure Measurement
- 8.5 Temperature Measurement
- 8.6 Additional Requirements for the Outdoor Air Enthalpy Method
- 8.7 Test Procedure for Steady-State Cooling Capacity Tests
- 8.8 Test Operating Procedure for Steady-State and Defrost Heating Capacity Tests
- Table 5 Test Tolerances
- 8.9 Test Procedure for Air Enthalpy Method—Indoor Side, Cyclic Dry-Coil Performance Test, Cooling and Heating Tests
- 9. Data to be Recorded [Go to Page]
- 9.1 Table 6 shows the data to be recorded during a test. Items indicated by an “x” under the test method columns are required when that test method is employed.
- 9.2 Test Tolerances
- Table 6 Data to be Recorded
- 10. Test Results [Go to Page]
- 10.1 Capacity Test Requirements
- 11. Symbols Used in Equations
- 12. Reference Properties and Data [Go to Page]
- 12.1 Thermodynamic Properties of Dry and Moist Air. The thermodynamic properties of dry and moist air shall be obtained from ASHRAE Research Project (RP) 1485.a
- 12.2 Thermodynamic Properties of Liquids. The thermodynamic properties of liquids shall be obtained from NIST Standard Reference Database 23 (REFPROP) b or from the source of the liquid and shall be recorded in the test report.
- 12.3 Thermodynamic Properties of Refrigerants. The thermodynamic properties of refrigerants shall be obtained from NIST Standard Reference Database 23 (REFPROP) b or from the source of the refrigerant and shall be recorded in the test report.
- 13. References [Go to Page]