ASHRAE 63.2 96 RA06 1996
$11.92
ASHRAE Standard 63.2-1996 (RA 2006) Method of Testing Liquid-Line Filter Drier (ANSI Approved)
| Published By | Publication Date | Number of Pages |
| ASHRAE | 1996 | 9 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | FOREWORD FOREWORD 1. PURPOSE 1. PURPOSE 2. SCOPE 2. SCOPE 2.1 This laboratory test method evaluates the capability of liquid-line filters and filter driers only for removing and retaining solid particles of a standard test contaminant. 2.1 This laboratory test method evaluates the capability of liquid-line filters and filter driers only for removing and retaining solid particles of a standard test contaminant. 2.2 The test method may be applied to all hermetic refrigerant liquid-line filters and filter driers up to and including Model 417S (line size 23 mm maximum). 2.2 The test method may be applied to all hermetic refrigerant liquid-line filters and filter driers up to and including Model 417S (line size 23 mm maximum). 2.3 The technique employed in this standard is the one-pass test method. In this test, a clean-up filter is installed downstream… 2.3 The technique employed in this standard is the one-pass test method. In this test, a clean-up filter is installed downstream… 2.4 Filter driers have the added capability of removing and retaining certain dissolved contaminants. This standard does not provide measurement of this capability. 2.4 Filter driers have the added capability of removing and retaining certain dissolved contaminants. This standard does not provide measurement of this capability. 3. DEFINITIONS 3. DEFINITIONS 4. MATERIALS AND APPARATUS 4. MATERIALS AND APPARATUS 4.1 Test Contaminant 4.1 Test Contaminant 4.1.1 General. The test contaminant will be a blend of 50% coarse test dust as received and 50% retained in a 200-mesh screen. P… 4.1.1 General. The test contaminant will be a blend of 50% coarse test dust as received and 50% retained in a 200-mesh screen. P… 4.1.2 Preparation of Test Contaminant. To prepare the blend of contaminant, first wet-screen a quantity of coarse test dust on a… 4.1.2 Preparation of Test Contaminant. To prepare the blend of contaminant, first wet-screen a quantity of coarse test dust on a… 4.1.2.1 Particle Size Analysis. The coarse test dust as received and the blend used as the test contaminant have the approximate particle sizes listed in Table 1. 4.1.2.1 Particle Size Analysis. The coarse test dust as received and the blend used as the test contaminant have the approximate particle sizes listed in Table 1. 4.2 Test Fluid. The test fluid shall be Refrigerant 113. R-113 is an ozone-depleting substance. Take care to minimize evaporation or loss of test fluid. 4.2 Test Fluid. The test fluid shall be Refrigerant 113. R-113 is an ozone-depleting substance. Take care to minimize evaporation or loss of test fluid. |
| 5 | 4.3 Clean-Up Filter. The clean-up filter shall be a filter membrane of 0.8 mm pore size, which is used to estimate the amount of contaminant that passed through the filter under test. 4.3 Clean-Up Filter. The clean-up filter shall be a filter membrane of 0.8 mm pore size, which is used to estimate the amount of contaminant that passed through the filter under test. 4.4 Test Loop Specification 4.4 Test Loop Specification 4.4.1 Pump. The pump shall be capable of producing a steady-state, nonpulsating flow sufficient to maintain the standard flow rate through the filter being tested at pressure drops up to 69 kPa. 4.4.1 Pump. The pump shall be capable of producing a steady-state, nonpulsating flow sufficient to maintain the standard flow rate through the filter being tested at pressure drops up to 69 kPa. 4.4.2 Reservoir. The reservoir shall be of adequate size to maintain a suitable liquid level at the pump while the test apparatu… 4.4.2 Reservoir. The reservoir shall be of adequate size to maintain a suitable liquid level at the pump while the test apparatu… 4.4.3 Bypass Valve. A bypass valve shall be provided in the test apparatus in order to vary and control the flow rate through the filter under test. In some systems it may be possible to control the flow rate by regulating the pump speed. 4.4.3 Bypass Valve. A bypass valve shall be provided in the test apparatus in order to vary and control the flow rate through the filter under test. In some systems it may be possible to control the flow rate by regulating the pump speed. 4.4.4 Flowmeter. The flowmeter may be of any generally accepted type, such as an orifice meter, venturi meter, or rotameter. The… 4.4.4 Flowmeter. The flowmeter may be of any generally accepted type, such as an orifice meter, venturi meter, or rotameter. The… 4.4.5 Heat Exchanger. A heat exchanger shall be provided (if necessary) to maintain the test fluid at 30ËšC ± 6ËšC. 4.4.5 Heat Exchanger. A heat exchanger shall be provided (if necessary) to maintain the test fluid at 30ËšC ± 6ËšC. 4.4.6 Manometer. A manometer or other pressure-measuring device with a maximum error of 0.3 kPa shall be used to measure the pre… 4.4.6 Manometer. A manometer or other pressure-measuring device with a maximum error of 0.3 kPa shall be used to measure the pre… 4.4.7 Sight Glasses. Sight glasses shall be installed in the test apparatus so a visual check can be made to ensure that a solid liquid flow (no bubbles) exists at the inlet and outlet of the filter under test. 4.4.7 Sight Glasses. Sight glasses shall be installed in the test apparatus so a visual check can be made to ensure that a solid liquid flow (no bubbles) exists at the inlet and outlet of the filter under test. 4.4.8 Contaminant-Loading Device. A contaminant- loading device shall be installed with bypass valves upstream of the filter under test to permit the introduction of the test contaminant into the test apparatus while it is in operation. 4.4.8 Contaminant-Loading Device. A contaminant- loading device shall be installed with bypass valves upstream of the filter under test to permit the introduction of the test contaminant into the test apparatus while it is in operation. 4.4.9 Vent Valve. A vent valve (optional solenoid valve) shall be located at the top of the test loop immediately ahead of the f… 4.4.9 Vent Valve. A vent valve (optional solenoid valve) shall be located at the top of the test loop immediately ahead of the f… 4.5 Equipment Layout. The general layout of the test apparatus is shown in Figure 1. The line size used throughout the test appa… 4.5 Equipment Layout. The general layout of the test apparatus is shown in Figure 1. The line size used throughout the test appa… |
| 6 | 5. TEST TO DETERMINE ACCURACY OF TEST SYSTEM 5. TEST TO DETERMINE ACCURACY OF TEST SYSTEM 5.1 General. The test for accuracy consists of adding a specified amount of contaminant to the test apparatus with no filter under test and determining the amount of contaminant retained on the clean-up filter. 5.1 General. The test for accuracy consists of adding a specified amount of contaminant to the test apparatus with no filter under test and determining the amount of contaminant retained on the clean-up filter. 5.2 Procedure for Test Apparatus Accuracy 5.2 Procedure for Test Apparatus Accuracy 5.2.1 With only a fresh, preweighed clean-up filter element installed and the test apparatus filled with clean test fluid, start… 5.2.1 With only a fresh, preweighed clean-up filter element installed and the test apparatus filled with clean test fluid, start… 5.2.2 It is not necessary to add the same amount of contaminant as that added during the filter test since only a part of that c… 5.2.2 It is not necessary to add the same amount of contaminant as that added during the filter test since only a part of that c… 5.3 Required Accuracy. The test apparatus shall be considered accurate if the clean-up filter retains at least 95% of the contaminant added. 5.3 Required Accuracy. The test apparatus shall be considered accurate if the clean-up filter retains at least 95% of the contaminant added. 6. PROCEDURE 6. PROCEDURE 6.1 Operating Cycle. Most refrigeration systems operate on an on-off basis according to the demand for cooling. Therefore, the p… 6.1 Operating Cycle. Most refrigeration systems operate on an on-off basis according to the demand for cooling. Therefore, the p… 6.2 Filter Under Test Position. The filter under test shall be vertical with the flow downward. 6.2 Filter Under Test Position. The filter under test shall be vertical with the flow downward. 6.3 Test Parameters. The filter under test, line size, test flow rate, and end-point pressure drop shall be agreed upon by the supplier and the customer requesting the test. 6.3 Test Parameters. The filter under test, line size, test flow rate, and end-point pressure drop shall be agreed upon by the supplier and the customer requesting the test. 6.4 Test Procedure 6.4 Test Procedure 6.4.1 Install the filter under test and a new preweighed element in the clean-up filter. Open the bypass valve. Fill the test ap… 6.4.1 Install the filter under test and a new preweighed element in the clean-up filter. Open the bypass valve. Fill the test ap… 6.4.2 With the pump running, close the bypass valve (or regulate the pump speed) slowly until the test flow rate is obtained. Al… 6.4.2 With the pump running, close the bypass valve (or regulate the pump speed) slowly until the test flow rate is obtained. Al… 6.4.3 With the test apparatus operating, arrange the valves to bypass the contaminant-loading chamber, remove the chamber cap, a… 6.4.3 With the test apparatus operating, arrange the valves to bypass the contaminant-loading chamber, remove the chamber cap, a… 6.4.4 Close the vent valve and restart the pump, adjust to the test flow rate if necessary, and repeat the cycle in 6.4.3 until … 6.4.4 Close the vent valve and restart the pump, adjust to the test flow rate if necessary, and repeat the cycle in 6.4.3 until … 6.4.5 Adjust the increment of contaminant addition so that the end-point pressure drop is reached within 6 to 12 additions. Slig… 6.4.5 Adjust the increment of contaminant addition so that the end-point pressure drop is reached within 6 to 12 additions. Slig… 6.4.6 After the end-point pressure drop is reached or exceeded, repeat five four-minute cycles at the test flow rate with no contaminant addition. 6.4.6 After the end-point pressure drop is reached or exceeded, repeat five four-minute cycles at the test flow rate with no contaminant addition. 6.5 Mass of Contaminant. Remove the filter element from the clean-up filter and thoroughly dry it in a 110ËšC oven before reweighing to determine the mass of contaminant that passed through the filter under test. 6.5 Mass of Contaminant. Remove the filter element from the clean-up filter and thoroughly dry it in a 110ËšC oven before reweighing to determine the mass of contaminant that passed through the filter under test. 7. CALCULATION OF RESULTS 7. CALCULATION OF RESULTS 7.1 Determine the Filter Efficiency (Ef ): 7.1 Determine the Filter Efficiency (Ef ): |
| 7 | 7.2 Plot a graph of contaminant loading (Mt) as the abscissa versus pressure drop (DP) as the ordinate (an exponential fit trend… 7.2 Plot a graph of contaminant loading (Mt) as the abscissa versus pressure drop (DP) as the ordinate (an exponential fit trend… 7.3 Compute the contaminant capacity (Mc) by applying the filter efficiency (Ef) to the contaminant loading (Mt) determined from the graph: 7.3 Compute the contaminant capacity (Mc) by applying the filter efficiency (Ef) to the contaminant loading (Mt) determined from the graph: APPENDIX A SAMPLE CALCULATION APPENDIX A SAMPLE CALCULATION A.1 Test flow rate of 4.5 kg/min (0.075 kg/s) R-113. End- point pressure drop of 30 kPa. Contaminant added in ten 1.2-gram increments for a total of 12 grams to produce a final pressure drop in excess of the end-point pressure drop. A.1 Test flow rate of 4.5 kg/min (0.075 kg/s) R-113. End- point pressure drop of 30 kPa. Contaminant added in ten 1.2-gram increments for a total of 12 grams to produce a final pressure drop in excess of the end-point pressure drop. A.2 The contaminant remaining in the test apparatus after the filter under test was removed was found to be A.2 The contaminant remaining in the test apparatus after the filter under test was removed was found to be A.3 Filter efficiency: A.3 Filter efficiency: A.4 As shown in Figure 2, plot a graph of contaminant loading versus filter under test pressure drop. From the graph, read the c… A.4 As shown in Figure 2, plot a graph of contaminant loading versus filter under test pressure drop. From the graph, read the c… APPENDIX B BIBLIOGRAPHY APPENDIX B BIBLIOGRAPHY |
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