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ASHRAE Standard 153 2021

ASHRAE Standard 153 2021

$38.46

ASHRAE Standard 153-2021 — Method of Test for Mass Flow Capacity of Four-Way Refrigerant Reversing Valves (ANSI Approved)

Published By Publication Date Number of Pages
ASHRAE 2021 18
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ASHRAE Standard 153 provides a means for measuring the mass flow capacity of reversing valves used on heat pumps and other refrigerating systems. The standard was created because accurate capacity data are needed to facilitate the proper application of four-way valves in a varietyof refrigerating systems that employ a variety of refrigerants. The test method is intended to be within the capabilities of most users and producers employing conventional laboratory apparatus. This standard allows the use of a wide variety of test fluids, including the refrigerant intended for the end application.

PDF Catalog

PDF Pages PDF Title
3 CONTENTS
4 FOREWORD
1. PURPOSE
2. SCOPE
3. DEFINITIONS
4. REQUIRED TEST CONDITIONS
4.1 The fluid entering both flow paths of the reversing valve shall be conditioned such that no phase change occurs in the test fluid throughout the test.
4.2 The fluid pressure, fluid temperature, and ambient air temperature surrounding the valve under test shall be stabilized during the test.
4.3 If lubricant is added to the fluid flow, the lubricant fraction flowing through the valve under test shall not be excessive. The amount must be contained in a thin coating on the internal wall of the system tubing and valve.
4.4 The fluid pressure entering the high-pressure flow path shall be higher than the pressure entering the low-pressure flow path to ensure that any pressure-sensitive seals are biased in the intended direction.
4.5 The flow rates through the reversing valve under test shall not exceed values that cause the pressure drop across the valve to exceed 10% of the absolute pressure entering the flow path to ensure that vapor flows (if vapor is used). This allows f…
5 4.6 Test flow rates shall extend above and below the intended end-use flow rate for the reversing valve. Select two (2) or more test conditions using the chosen fluid (gas or liquid) that will span the desired operating range. Compute and record the …
5. DATA REQUIRED
5.1 Test Information
5.2 Test Conditions and Results (required for both flow paths in each position)
6. TEST INSTRUMENTS
7. TEST APPARATUS
7.1 The four-way valve under test shall be installed in a test apparatus as shown in Figures 1, 2, 3, and 4. The reversing valve shall be mounted in the manufacturer’s recommended orientation. An example of a complete test system is shown in Inform…
7.2 The test apparatus shall comprise the following essential elements:
7.3 Installation of test instrumentation shall conform to the following requirements:
6 8. TEST PROCEDURE
8.1 Install the valve to be tested in the test apparatus (see Figures 1, 2, 3, and 4), and check the installation for external leakage, employing appropriate purging or evacuation procedures and ensuring that the system has adequate working fluid cha…
8.2 Start the system and bring it to preselected operating conditions.
8.3 Valve Position A. Test the valve in both position A and B unless the valve is symmetrical.
8.4 Valve Position B (optional if valve is symmetrical)
9. MASS FLOW-RATE CALCULATION
9.1 Compute the value of (rTDPT)1/2 corresponding to each of the measured mass flow rates, where rT is the density of test fluid entering the flow path under test, and DPT is the measured pressure drop across the flow path under test.
9.2 Plot each of the data points on four (4) separate linear graphs—one (1) graph each for the high-pressure flow path and the low-pressure flow path for both valve position A and valve position B. Plot (rTDPT)1/2 on the abscissa versus the corresp…
9.3 Fit the best straight line to each set of data using the least- squares method and including the origin (0, 0) as a data point in each data set.
9.4 Capacity of either flow path at its specified condition shall be found graphically by entering the graph for the flow path of interest on the abscissa at the specified value of (rDP)1/ 2, projecting vertically to the point of intersection with th…
10. NORMATIVE REFERENCES
11 INFORMATIVE APPENDIX A: EXAMPLE DATA SHEET AND GRAPH FOR FOUR-WAY REVERSING VALVE MASS FLOW CAPACITY
13 INFORMATIVE APPENDIX B: COMPUTATION OF FLOW CAPACITY IN TERMS OF REFRIGERATING EFFECT
14 INFORMATIVE APPENDIX C: SUGGESTED TEST APPARATUS IF TESTING WITH REFRIGERANT
C1. OVERVIEW
C1.1 A variable-capacity compressor—may be variable speed or driven by a variable-speed belt drive.
C1.2 The reversing valve under test having appropriate gages or sensors—adapters and connectors to accommodate various tube sizes may be needed. Refer to Figures 1 and 2 for details.
C1.3 A first heat-rejection heat exchanger having airflow control baffle or other method of adjusting heat removal.
C1.4 A sight glass to be used for a visual check to make certain single-phase liquid is flowing.
C1.5 A liquid flowmeter to measure refrigerant flow rate.
C1.6 An adjustable refrigerant-flow restrictor valve.
C1.7 A second heat-rejection heat exchanger having airflow control baffle or other method of adjusting heat removal.
C1.8 A sight glass to be used for observing that single-phase vapor flow is present.
16 INFORMATIVE APPENDIX D: BIBLIOGRAPHY

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ASHRAE Standard 153 2021
$38.46