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ASHRAE Standard 17-2022 -- Method of Testing Capacity of Electronic and Thermostatic Refrigerant Expansion Valves (ANSI Approved), 2022
- ANSI/ASHRAE Standard 17-2022 [Go to Page]
- Contents
- Foreword
- 1. Purpose
- 2. Scope [Go to Page]
- 2.1 This standard is applicable to
- 2.2 This standard specifies procedures, apparatus, and instrumentation that will produce accurate capacity data.
- 2.3 This standard does not
- 3. Definitions
- 4. Conditions for Testing Capacity [Go to Page]
- 4.1 Testing for capacity of thermostatic expansion valves (TXVs) shall be performed in accordance with Section 8 of this standard.
- 4.2 The liquid refrigerant entering the TXV shall be subcooled at least 5°C (10°F).
- 4.3 The refrigerant shall be free from contamination. Refer to AHRI Standard 700 7 for refrigerant specifications.
- 4.4 The lubricant concentration in the refrigerant shall not exceed 2% by mass.
- 4.5 If testing capacity is for rating purposes, use standard test conditions found in the related industry standards 3,4,5,6.
- 5. Data Required for Reporting Capacity [Go to Page]
- 5.1 The predetermined test conditions shall include the following values:
- 5.2 The refrigerant mass flow rate or air volumetric flow rate (for EXVs only) shall be the measured value.
- 6. Test Instruments [Go to Page]
- 6.1 Measurement equipment shall be certified standard instruments of the types listed in this section.
- 6.2 Temperature Measuring Instruments
- 6.3 Pressure Measuring Instruments
- 6.4 Refrigerant Flow Measuring Instruments. Accuracy of flow measuring instruments shall be within ±1.0% of the indicated value.
- 6.5 Other Instruments
- 7. Test Apparatus [Go to Page]
- 7.1 TXV Air Fixture. The static superheat setting of the thermostatic expansion valve (TXV) shall be measured with the test valve installed in an air fixture as described in Figure 1 or 2. The fixture shall contain all the essential elements shown, a...
- 7.2 TXV Refrigerant Fixture. The capacity of the TXV shall be measured with the test valve installed in a refrigerant fixture as described in Figure 3 or 4. The system shall contain all the essential elements shown, and instrumentation shall conform ...
- 7.3 EXV Fixture. The electric expansion valve (EXV) capacity shall be measured with either air or refrigerant using the fixtures described in Figure 5 or 6. The system shall contain all the essential elements shown, and instrumentation shall conform ...
- 7.4 Main Length. The inlet and outlet mains connected to the valve being tested shall be straight for a minimum of fourteen (14) internal diameters from the face of the valve inlet and outlet connections.
- 7.5 Pressure-Tap Holes. Pressure-tap holes shall be located at appropriate points on the circumference of the main. With horizontal mains, the pressure-tap hole position depends on the fluid flowing. For liquids, the pressure-tap holes shall be level...
- 7.6 Fluid Temperature Measurement Locations. Measurement of the temperature of the fluid entering the valve shall be made at a point located not more than twelve (12) internal main diameters upstream from the face of the inlet connection of the valve...
- 8. Test Procedure—Thermostatic Expansion Valve Only [Go to Page]
- 8.1 Static Superheat and Initial Valve Opening
- 8.2 Refrigerant System Test
- 8.3 Permanent Bleed Rate Test. This test is only applicable to permanent bleed-type valves.
- 9. Test Procedure—Electronic Expansion Valve Only [Go to Page]
- 9.1 EXV Capacity Open Position
- 9.2 Refrigerant System Test
- 9.3 Air Test
- 10. Capacity Calculation
- 11. REFERENCES
- Informative Appendix A: Additional Testing [Go to Page]
- A1. Very Small Flow Exception
- A2. Valve Opening vs. Temperature Sensing Element Temperature (Sometimes Referred to as “Valve Temperature Gradient”)
- A3. Refrigerant Flow vs. Valve Opening
- A4. Determination of Superheat Change at Other Capacities
- A5. Example
- Informative Appendix B: Example Calculation of Refrigerant Flow from Measured Airflow [Go to Page]
