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eLibrary > >

, 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]

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