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eLibrary > ASHRAE Standard 225-2020 -- Method for Performance Testing Centrifugal Refrigerant Compressors and Condensing Units (ANSI Approved) >

ASHRAE Standard 225-2020 -- Method for Performance Testing Centrifugal Refrigerant Compressors and Condensing Units (ANSI Approved), 2020

ANSI/ASHRAE Standard 225-2020 [Go to Page]
CONTENTS
FOREWORD
1. PURPOSE
2. SCOPE
3. DEFINITIONS
4. CLASSIFICATIONS [Go to Page]
4.1 Compressor Types. Centrifugal compressors that are within the scope of this standard are classified as one of the following types:
4.2 Condensing Unit Types. Centrifugal condensing 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 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. If the primary test method for mass flow rate measurement is either a gaseous or liquid refrigerant flowmeter, then it is not necessary to provide a simultaneous and independent conf...
5.3 Intermediate Cooling and Liquid Injection. If intermediate cooling or liquid injection is included in the unit under test (UUT):
5.4 Input Power. In the primary test method, the total input power in 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 an industry recognized source such as NIST Thermodynamic Properties of Refrigerants and Refrigerant Mixtures Database (REFPROP) 4. The source of refrigerant properties shall ...
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 Calculations
6. INSTRUMENTS [Go to Page]
6.1 Instruments and data acquisition systems shall be selected to meet the measurement system accuracy specified in the test plan.
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 41.102 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 i...
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
7.7 Calculated Compressor Test Results
8. CONDENSING UNIT OPERATING CONDITIONS [Go to Page]
8.1 Liquid-Cooled Condensing Units
8.2 Air-Cooled Condensing Units
8.3 Evaporatively Cooled Condensing Units
9. CONDENSING 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 Condensing Unit Test Results
9.7 Calculated Compressor Test Results
10. REFERENCES
NORMATIVE APPENDIX A: CALCULATION OF TOTAL PROPERTIES AT COMPRESSOR INLETS AND OUTLETS [Go to Page]
A1. Total Properties
A2. SYMBOLS
A3. Subscripts
INFORMATIVE APPENDIX B: BIBLIOGRAPHY
INFORMATIVE APPENDIX C: CALCULATION OF COMPRESSOR EFFICIENCY [Go to Page]
C1. Total Enthalpy
C2. Symbols
C3. Subscripts
INFORMATIVE APPENDIX D: THERMODYAMIC STATE POINTS [Go to Page]
D1. Thermodynamic State Points [Go to Page]

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