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ASHRAE 17 08:2008 Edition

ASHRAE 17 08:2008 Edition

$21.13

ASHRAE Standard 17-2008 Method of Testing Capacity of Thermostatic Refrigerant Expansion Valves (ANSI/ASHRAE Approved)

Published By Publication Date Number of Pages
ASHRAE 2008 12
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PDF Pages PDF Title
4 FOREWORD
FOREWORD
1. PURPOSE
1. PURPOSE
2. SCOPE
2. SCOPE
2.1 This standard is applicable to
2.1 This standard is applicable to
2.2 This standard specifies procedures, apparatus, and instrumentation that will produce accurate capacity data.
2.2 This standard specifies procedures, apparatus, and instrumentation that will produce accurate capacity data.
2.3 This standard does not
2.3 This standard does not
3. DEFINITIONS
3. DEFINITIONS
5 4. CONDITIONS FOR TESTING CAPACITY
4. CONDITIONS FOR TESTING CAPACITY
4.1 Testing for capacity of thermostatic expansion valves shall be performed in accordance with Section 8 of this standard.
4.1 Testing for capacity of thermostatic expansion valves shall be performed in accordance with Section 8 of this standard.
4.2 The liquid refrigerant entering the thermostatic expansion valve shall be subcooled at least 5°C (10°F).
4.2 The liquid refrigerant entering the thermostatic expansion valve shall be subcooled at least 5°C (10°F).
4.3 The refrigerant should be free from contamination. Refer to ARI Standard 7004 for recommendations.
4.3 The refrigerant should be free from contamination. Refer to ARI Standard 7004 for recommendations.
4.4 The lubricant concentration in the refrigerant shall not exceed 2% by mass.
4.4 The lubricant concentration in the refrigerant shall not exceed 2% by mass.
4.5 If it is desired to use standard test condition values, these may be found in the related industry standard, ARI Standard 750.3
4.5 If it is desired to use standard test condition values, these may be found in the related industry standard, ARI Standard 750.3
5. DATA REQUIRED FOR REPORTING CAPACITY
5. DATA REQUIRED FOR REPORTING CAPACITY
5.1 The predetermined test conditions shall include the following values:
5.1 The predetermined test conditions shall include the following values:
5.2 The refrigerant mass flow rate shall be the measured value.
5.2 The refrigerant mass flow rate shall be the measured value.
6. TEST INSTRUMENTS
6. TEST INSTRUMENTS
6.1 Measurement equipment shall be certified standard instruments of the types listed in this section.
6.1 Measurement equipment shall be certified standard instruments of the types listed in this section.
6.2 Temperature-Measuring Instruments
6.2 Temperature-Measuring Instruments
6.3 Pressure-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.
6.4 Refrigerant Flow-Measuring Instruments. Accuracy of flow-measuring instruments shall be within ±1.0% of the indicated value.
6 6.5 Other Instruments. Dial or other indicators to measure valve plug position relative to the valve port shall have a scale graduated in 0.03 mm (0.001 in.) or finer increments.
6.5 Other Instruments. Dial or other indicators to measure valve plug position relative to the valve port shall have a scale graduated in 0.03 mm (0.001 in.) or finer increments.
7. TEST APPARATUS
7. TEST APPARATUS
7.1 Air Fixture. The static superheat setting of the thermostatic expansion valve shall be measured with the test valve installed in an air fixture as described in Figure 1 or 2. The fixture shall contain all of the essential elements shown, and inst…
7.1 Air Fixture. The static superheat setting of the thermostatic expansion valve shall be measured with the test valve installed in an air fixture as described in Figure 1 or 2. The fixture shall contain all of the essential elements shown, and inst…
7.2 Refrigerant Fixture. The capacity of the thermostatic expansion valve shall be measured with the test valve installed in a refrigerant fixture as described in Figure 3 or 4. The system shall contain all of the essential elements shown, and instru…
7.2 Refrigerant Fixture. The capacity of the thermostatic expansion valve shall be measured with the test valve installed in a refrigerant fixture as described in Figure 3 or 4. The system shall contain all of the essential elements shown, and instru…
8. TEST PROCEDURE
8. TEST PROCEDURE
8.1 Static Superheat and Initial Valve Opening
8.1 Static Superheat and Initial Valve Opening
8.2 Refrigerant System Test
8.2 Refrigerant System Test
8.3 Permanent Bleed Rate Test. This test is only applicable to permanent bleed-type valves.
8.3 Permanent Bleed Rate Test. This test is only applicable to permanent bleed-type valves.
7 9. CAPACITY CALCULATION
9. CAPACITY CALCULATION
10. REFERENCES
10. REFERENCES
8 APPENDIX A
APPENDIX A

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