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ASHRAE Standard 17 2022

ASHRAE Standard 17 2022

$40.63

ASHRAE Standard 17-2022 — Method of Testing Capacity of Electronic and Thermostatic Refrigerant Expansion Valves (ANSI Approved)

Published By Publication Date Number of Pages
ASHRAE 2022 18
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ASHRAE Standard 17 prescribes a method of testing capacity of electronic and thermostatic expansion valves for use in air-conditioning and refrigeration systems. The 2022 edition of Standard 17 adds electronic expansion valves, changes example calculations to use R-410A (previously R-22), and updates references.

PDF Catalog

PDF Pages PDF Title
1 ANSI/ASHRAE Standard 17-2022
3 Contents
4 Foreword
1. Purpose
2. Scope
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
5 4. Conditions for Testing Capacity
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
5.1 The predetermined test conditions shall include the following values:
6 5.2 The refrigerant mass flow rate or air volumetric flow rate (for EXVs only) shall be the measured value.
6. Test Instruments
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
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…
7 8. Test Procedure—Thermostatic Expansion Valve Only
8.1 Static Superheat and Initial Valve Opening
8.2 Refrigerant System Test
9 8.3 Permanent Bleed Rate Test. This test is only applicable to permanent bleed-type valves.
9. Test Procedure—Electronic Expansion Valve Only
10 9.1 EXV Capacity Open Position
9.2 Refrigerant System Test
9.3 Air Test
10. Capacity Calculation
11 11. REFERENCES
12 Informative Appendix A: Additional Testing
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
15 Informative Appendix B: Example Calculation of Refrigerant Flow from Measured Airflow

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ASHRAE Standard 17 2022
$40.63