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ASHRAE Standard 63.2 2024

ASHRAE Standard 63.2 2024

$40.63

ASHRAE Standard 63.2-2024 — Method of Testing Liquid-Line Filter Drier Filtration Capability (ANSI Approved)

Published By Publication Date Number of Pages
ASHRAE 2024 12
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ANSI/ASHRAE Standard 63.2 prescribes a method for measuring the filtration capability of liquid-line filters and filter driers for use in refrigerant systems. It is recognized that the test contaminant, test fluid, test equipment, and method in the prescribed test do not fully represent the conditions that can exist in the liquid line of a refrigerant system. The specified test contaminant was chosen as the most nearly representative controlled-particle-size test contaminant commercially available. The wide range of controlled particle sizes used provides a satisfactory degree of repeatability of test results. However, it is recognized that seldom, if ever, will the composition, particle size, and mix of the test contaminant be duplicated in an actual system. Therefore, the filtration capability of a filter determined by this test does not necessarily predict its exact capability in actual service in a refrigerant liquid line. This test, however, serves as a useful means of comparing filter capabilities and implementing quality control to maintain uniformity of products. The 2024 edition of Standard 63.2 includes updates to Informative Appendix B.

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PDF Pages PDF Title
1 ANSI/ASHRAE Standard 63.2-2024
3 Contents
4 Foreword
1. Purpose
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.
2.2 The test method may be applied to all hermetic refrigerant liquid-line filters and filter driers.
2.3 The technique employed in this standard is the one-pass test method. In this test, a clean-up filter is installed downstream of the test sample and is designed to retain and prevent recirculation of the majority of the contaminant particles that …
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
5 4. Materials and Apparatus
4.1 Test Contaminant
4.2 Test Fluid. Permissible test fluids are shown in Table 2. Take appropriate steps to minimize evaporation or loss of test fluid during the test procedure.
4.3 Clean-Up Filter. The clean-up filter shall be a filter membrane of 0.8 μm (3.15 × 10–5 in.) pore size. The filter is used to determine the amount of contaminant that passed through the filter under test.
4.4 Balance. A weighing method with less than or equal to 0.1% resolution of the masses being weighed shall be used during the test procedure.
4.5 Test Loop Specification (see Figure 1)
6 4.6 Equipment Layout. The layout of the test apparatus is shown in Figure 1. The line size used throughout the test apparatus shall be any convenient size to cover a range of flow rates that will permit the testing of filters of various size and prev…
5. Test to Determine Accuracy of Test System
5.1 Scope. The test for accuracy consists of adding a specified amount of contaminant to the test apparatus without filter under test and determining the amount of contaminant retained on the clean-up filter.
5.2 Procedure for Test Apparatus Accuracy
7 5.3 Required Accuracy. The test apparatus is accurate if the clean-up filter retains at least 95% of the contaminant added.
6. Procedure
6.1 Operating Cycle. The majority of refrigeration systems operate on an on-off basis according to the demand for cooling. Therefore, the intention of this method for testing the filtration ability of a filter is to operate the test apparatus with in…
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 reported.
6.4 Test Procedure
6.5 Mass of Contaminant. Remove the filter element from the clean-up filter. Thoroughly dry the filter element in a 110°C (230°F) oven before reweighing to determine the mass of contaminant that passed through the filter under test.
8 7. Calculation of Results
7.1 Determine the Filter Efficiency in % (Ef)
7.2 Plot a graph of cumulative contaminant loading as the abscissa versus pressure drop (DP) as the ordinate. From the graph, or through trendline or interpolation calculations, read the contaminant loading at the end-point pressure drop (Me). An exp…
7.3 Compute the contaminant capacity (Mc) by applying the filter efficiency (Ef) to the end-point contaminant loading (Me) determined from the graph:
9 Informative Appendix A: Sample Calculation
10 Informative Appendix B: Bibliography

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ASHRAE Standard 63.2 2024
$40.63