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ASHRAE Standard 23-2022 -- Methods for Performance Testing Positive Displacement Refrigerant Compressors and Compressor Units, 2022
- ANSI/ASHRAE Standard 23-2022 [Go to Page]
- CONTENTS
- FOREWORD
- 1. PURPOSE
- 2. SCOPE [Go to Page]
- 2.1 This standard applies to methods for performance testing single-stage and multistage positive displacement refrigerant compressors and compressor units.
- 2.2 This standard applies to compressors and compressor units that either (a) do not have intermediate cooling or refrigerant injection or (b) do have intermediate cooling or refrigerant injection, and the power required for intermediate cooling or r...
- 3. DEFINITIONS [Go to Page]
- 3.1 The following definitions apply to the terms used in this standard.
- 4. CLASSIFICATIONS [Go to Page]
- 4.1 Compressor Types. Positive-displacement compressors that are within the scope of this standard are classified as one of the following types:
- 4.2 Compressor Unit Types. Positive-displacement compressor units that are within the scope of this standard are classified as one of the following types:
- 4.3 Calorimeter Types. Calorimeters that are within the scope of this standard are classified either as one of the following types:
- 4.4 Flowmeter Types. Flowmeters that are within the scope of this standard are classified as one of the following types:
- 5. REQUIREMENTS [Go to Page]
- 5.1 Test Plan. A test plan shall specify the test points and the calculations to be performed. The test plan shall be one of the following:
- 5.2 Primary and Confirming Refrigerant Mass Flow Rate Measurements. A simultaneous, independent confirming test at the specified set of operating conditions is not required if a flowmeter test method is selected to be the primary test method. However...
- 5.3 Intermediate Cooling and Injection. Apply the requirements in Section 5.3.1 for operation at subcritical pressures of the refrigerant, or apply the requirements in Section 5.3.2 for operation at supercritical pressures of the refrigerant.
- 5.4 Input Power. In the primary test method, the total input power, W (hp), to the UUT shall be measured at each test point in accordance with ASHRAE Standard 41.11 3.
- 5.5 Measurement Uncertainty. The uncertainty in each refrigerant mass flow rate measurement and power input measurement shall be estimated at each test point using the methods prescribed in ASHRAE Standard 41.9 1 or ASHRAE Standard 41.10 2 at 95% pro...
- 5.6 Refrigerant Data. The primary source of refrigerant properties shall be NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP) 4. Refrigerant properties for refrigerants that are not included in REFPROP shall be obtained f...
- 5.7 Refrigerant Numbers. The ASHRAE refrigerant number 5 for the refrigerant used during these tests shall be stated in the test report.
- 5.8 In this standard, the term “Btu” is the BtuIT 6 variant, where 1 Btu = 1.055056 kJ, and the term “power” is electric power, where 1 hp = 746 W 6.
- 5.9 Calculations
- 6. INSTRUMENTS [Go to Page]
- 6.1 Instruments and data acquisition systems shall be selected to meet the accuracy limits specified in the paragraphs below.
- 6.2 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 a National Metrology Inst...
- 6.3 Instruments shall be installed and applied in accordance with the following:
- 6.4 Flowmeter Installation and Accuracy. If ASHRAE Standard 41.10 is a selected primary or secondary test method, the flowmeter measurement system accuracy shall be within ±1.0% of the quantity measured unless otherwise specified in the test plan in...
- 6.5 Input Power Measurement Accuracy. Input power measurement system accuracy shall be within ±1.0% of the quantity measured unless otherwise specified in the test plan in Section 5.1.
- 7. COMPRESSOR TEST REPORT [Go to Page]
- 7.1 Test Identification
- 7.2 Unit Under Test Description
- 7.3 Primary Method Equipment Description
- 7.4 Confirming Method Equipment Description
- 7.5 Test Conditions and Limits
- 7.6 Measured Compressor Test Results. Apply the measured compressor test results requirements in Section 7.6.1 for operation at subcritical pressures of the refrigerant, or apply the measured compressor test results requirements in Section 7.6.2 for ...
- 7.7 Calculated Compressor Test Results
- 8. COMPRESSOR UNIT OPERATING CONDITIONS [Go to Page]
- 8.1 Liquid-Cooled Compressor Units
- 8.2 Air-Cooled Compressor Units
- 8.3 Evaporatively Cooled Compressor Units
- 9. COMPRESSOR UNIT TEST REPORT [Go to Page]
- 9.1 Test Identification
- 9.2 Unit Under Test Description
- 9.3 Primary Method Equipment Description
- 9.4 Confirming Method Equipment Description
- 9.5 Test Conditions and Limits
- 9.6 Measured Compressor Unit Test Results. Apply the measured compressor unit test results requirements in Section 9.6.1 for operation at subcritical pressures of the refrigerant, or apply the measured compressor unit test results requirements in Sec...
- 9.7 Calculated Compressor Unit Test Results
- 10. REFERENCES
- INFORMATIVE APPENDIX A: THERMODYAMIC STATE POINTS [Go to Page]
