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ASHRAE Standard 23.2 2019

ASHRAE Standard 23.2 2019

$38.46

ASHRAE Standard 23.2-2019 — Methods of Test for Rating the Performance of Positive Displacement Compressors that Operate at Supercritical Pressures of the Refrigerants (ANSI Approved)

Published By Publication Date Number of Pages
ASHRAE 2019 18
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ASHRAE Standard 23.2 provides methods of test for rating the performance of positive displacement compressors and compressor units that operate at supercritical pressures of the refrigerant.It does not apply to the performance testing of positive displacement compressors that operate at supercritical pressures of the refrigerant (for example, compressors that operate on CO2).

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PDF Pages PDF Title
3 CONTENTS
4 FOREWORD
1. PURPOSE
2. SCOPE
2.1 This standard applies to methods for performance testing single-stage and multistage positive displacement refrigerant compressors and condensing units that operate at discharge pressures greater than the critical pressure of the refrigerant.
2.2 This standard applies to compressors and condensing 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 re…
3. DEFINITIONS
5 4. CLASSIFICATIONS
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 Calorimeter Types. Calorimeters that are within the scope of this standard are classified either as evaporator calorimeters or as condenser calorimeters.
4.3 Flowmeter Types. Flowmeters that are within the scope of this standard are classified as one of the following types:
5. REQUIREMENTS
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. Each test data point shall consist of a primary test and a simultaneous, independent confirming test at a specified set of operating conditions. To be independent,
6 Table 1 Alternative Test Methods for Measuring Refrigerant Mass Flow Rates
5.3 Intermediate Cooling and Supercritical Fluid Injection. If intermediate cooling or supercritical fluid injection is included in the UUT, then the following apply:
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 Thermodynamic Properties of Refrigerants and Refrigerant Mixtures Database (REFPROP) 4. Refrigerant properties for refrigerants that are not included in REFPROP shall be…
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
9 6. INSTRUMENTS
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.
10 7. COMPRESSOR TEST REPORT
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
11 7.7 Calculated Compressor Test Results
8. COMPRESSOR UNIT OPERATING CONDITIONS
8.1 Liquid-Cooled Gas Coolers
8.2 Air-Cooled Gas Coolers
8.3 Evaporatively Cooled Gas Coolers
9. COMPRESSOR UNIT TEST REPORT
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
12 9.6 Measured Compressor Unit Test Results
9.7 Calculated Compressor Unit Test Results
10. REFERENCES
13 Figure 1 Cycle schematic and pressure-enthalpy diagram for a two-stage compressor with intermediate cooling.
Figure 2 Cycle schematic and pressure-enthalpy diagram for compressors in series with intermediate cooling.
14 Figure 3 Cycle schematic and pressure-enthalpy diagram for a single-stage compressor.
Figure 4 Cycle schematic and pressure-enthalpy diagram for a two-stage compressor with vapor injection using a flash tank economizer.
Figure 5 Cycle schematic and pressure-enthalpy diagram for a two-stage compressor with vapor injection using a heat exchanger economizer and liquid refrigerant that is extracted upstream of the economizer.
15 Figure 6 Cycle schematic and pressure-enthalpy diagram for a two-stage compressor with vapor injection using a heat exchanger economizer and liquid refrigerant that is extracted downstream of the economizer.
Figure 7 Cycle schematic and pressure-enthalpy diagram for compressors connected in series with vapor injection using a flash tank economizer.
Figure 8 Cycle schematic and pressure-enthalpy diagram for compressors connected in series with vapor injection using a heat exchanger economizer and liquid refrigerant that is extracted upstream of the economizer.
16 Figure 9 Cycle schematic and pressure-enthalpy diagram for compressors connected in series with vapor injection using a heat exchanger economizer and liquid refrigerant that is extracted downstream of the economizer.
Figure 10 Temperature sensor locations.

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