AHRI 710 I-P-2009 Performance Rating of Liquid-Line Driers.pdf

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1、 AHRI Standard 710 (I-P)2009 Standard for Performance Rating of Liquid-Line Driers Price $12.50 (M) $25.00 (NM) Printed in U.S.A. Copyright 2009, by Air-Conditioning, Heating, and Refrigeration Institute Registered United States Patent and Trademark Office IMPORTANT SAFETY DISCLAIMER AHRI does not s

2、et safety standards and does not certify or guarantee the safety of any products, components or systems designed, tested, rated, installed or operated in accordance with this standard/guideline. It is strongly recommended that products be designed, constructed, assembled, installed and operated in a

3、ccordance with nationally recognized safety standards and code requirements appropriate for products covered by this standard/guideline. AHRI uses its best efforts to develop standards/guidelines employing state-of-the-art and accepted industry practices. AHRI does not certify or guarantee that any

4、tests conducted under its standards/guidelines will be non-hazardous or free from risk. Note: This standard supersedes ARI Standard 710-2004. For SI ratings, see AHRI Standard 711 (SI)-2009. TABLE OF CONTENTS SECTION PAGE Section 1. Purpose1 Section 2. Scope.1 Section 3. Definitions.2 Section 4. Tes

5、t Requirements 3 Section 5. Rating Requirements.3 Section 6. Minimum Data Requirements for Published Ratings .5 Section 7. Marking and Nameplate Data .5 Section 8. Conformance Conditions 5 TABLES Table 1. Applicable Refrigerant Systems .1 Table 2. Published Ratings3 Table 3. Maximum Range for Duplic

6、ate EPD Determination4 Table 4. Flow Rate per Ton of Refrigeration at 86F Liquid and 5.0F Saturated Vapor5 FIGURES Figure 1. Example of Water Capacity Rating Calculation for Refrigerant 134a at 75F 6 Appendix A. References Normative.7 Appendix B. References Informative.7 Appendix C. Guide for Select

7、ing a Liquid-line Drier Informative 8 AHRI Standard 710 (I-P)-2009 1 PERFORMANCE RATING OF LIQUID-LINE DRIERS Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish for Liquid-line Driers: definitions; test requirements; rating requirements; minimum data requirements for Publis

8、hed Ratings; marking and nameplate data; and conformance conditions. 1.1.1 Intent. This standard is intended for the guidance of the industry, including manufacturers, engineers, installers, contractors and users. 1.1.2 Review and Amendment. This standard is subject to review and amendment as techno

9、logy advances. Section 2. Scope 2.1 Scope. This standard applies to Liquid-line Driers utilizing solid Desiccants designed for use in the liquid line of all types of refrigeration and air-conditioning systems. 2.2 Applicability. This standard applies to Liquid-line Driers for use in refrigerant syst

10、ems employing the halocarbon refrigerants listed in Table 1, as described in ANSI/ASHRAE Standard 34:Table 1. Applicable Refrigerant Systems Refrigerant Number Chemical Name Chemical Formula R-12 dichlorodifluoromethane CC12F2R-22 monochlorodifluoromethane CHC1F2R-134a 1,1,1,2-tetrafluoroethane CH2F

11、CF3R-245fa 1,1,1,3,3-pentafluoropropane CHF2CH2CF3R-404A Refrigerants 125/143a/134a 44.0/52.0/4.0 % wt. CHF2CF3/ CH3CF3/ CH2FCF3R-407C Refrigerants 32/125/134a 23.0/25.0/52.0 % wt. CH2F2/ CHF2CF3/ CH2FCF3R-410A Refrigerants 32/125 50.0/50.0 % wt. CH2F2/ CHF2CF3R-502 Refrigerants 22/115 48.8/51.2 % w

12、t. CHC1F2/ CC1F2CF3R-507A Refrigerants 125/143a 50.0/50.0 % wt. CHF2CF3/ CH3CF32.3 Exclusions. This standard does not apply to liquid anti-freeze solution Desiccants or driers used in the suction line or low side of refrigeration and air-conditioning systems. 2.4 Limitations. This standard provides

13、a means of determining Water Capacity and Refrigerant Flow Capacity of a Liquid-line Drier at specified conditions. This standard does not attempt to reflect the performance of a Liquid-line Drier over the entire range of possible applications. Therefore, acid and particulate removal are not conside

14、red here. 2.4.1 Acid Removal. It is known that acid in a refrigeration system causes harmful corrosion. Many Liquid-line Driers will remove acids. However, there is no knowledge at the present time as to what concentration of various acids is allowable, nor how to test a liquid-line driers ability t

15、o remove these acids. Therefore, while noting its importance, no consideration of acid removal is given in this standard at this time. AHRI Standard 710 (I-P)-2009 2 2.4.2 Particulate Removal. Although many commercial Liquid-line Driers have filtering media, the subject of filtration is separate and

16、 distinct from the considerations of this standard. Therefore, the rating of a Liquid-line Drier is on the premise of a clean Liquid-line Drier and clean refrigerant. Section 3. Definitions All terms in this document follow the standard industry definitions in the current edition of ASHRAE Terminolo

17、gy of Heating, Ventilation, Air Conditioning and Refrigeration unless otherwise defined in this section.3.1 “As Received” Condition. This specifies the Liquid-line Drier as removed from the manufacturers packaging, without further reactivation or preparation. (Note: If information is desired with re

18、spect to the reactivation of a Liquid-line Drier, the user should consult the manufacturer for recommended reactivation procedure.) 3.2 Desiccant. A material that will collect and hold water. 3.3 Equilibrium Point Dryness (EPD). The lowest possible water content of liquid refrigerant attainable by a

19、 specific Liquid-line Drier. This is achieved at a specific temperature after it has collected a specific quantity of water when the two have been in contact until an equilibrium between the water in the refrigerant and the water in the Liquid-line Drier has been reached. EPD is expressed in parts p

20、er million (ppm) by weight. 3.4 Liquid-line Drier. A manufactured device for use in the liquid line of refrigeration and air-conditioning systems. The primary purpose is to collect and hold, at its location, water which is in excess of the amount which can be tolerated in the system. 3.5 Pressure Dr

21、op. The pressure difference between the inlet and the outlet of a Liquid-line Drier, including its connections. 3.6 Published Rating. A statement of the assigned values of those performance characteristics, under stated Rating Conditions, by which a unit may be chosen to fit its application. These v

22、alues apply to all units of like nominal size and type (identification) produced by the same manufacturer. The term Published Rating includes the rating of all performance characteristics shown on the unit or published in specifications, advertising or other literature controlled by the manufacturer

23、, at stated Rating Conditions. 3.6.1 Application Rating. A rating based on tests performed at application Rating Conditions (other than Standard Rating Conditions). 3.6.2 Standard Rating. A rating based on tests performed at Standard Rating Conditions. 3.7 Rating Conditions. Any set of operating con

24、ditions under which a single level of performance results and which causes only that level of performance to occur. 3.7.1 Standard Rating Conditions. Rating Conditions used as the basis of comparison for performance characteristics.3.8 Refrigerant Flow Capacity. The refrigerating capacity for a flow

25、 of liquid refrigerant at specified conditions, which the Liquid-line Drier will pass and not exceed the specified Pressure Drop. 3.9 “Shall” or “Should”. “Shall” or “should” shall be interpreted as follows: 3.9.1 Shall. Where “shall” or “shall not” is used for a provision specified, that provision

26、is mandatory if compliance with the standard is claimed. 3.9.2 Should. “Should” is used to indicate provisions which are not mandatory but which are desirable as good practice. 3.10 Temperature. The temperature of the liquid refrigerant passing through the Liquid-line Drier, F. 3.11 Water Capacity.

27、The amount of water which a Liquid-line Drier will collect and hold, at each Rating Condition, and still maintain at equilibrium, a water content at or below a given concentration (EPD) in any of the liquid refrigerants. It shall be expressed in drops. For the purpose of this standard, one drop of w

28、ater per pound of refrigerant is assumed to be equal to 110 ppm.AHRI Standard 710 (I-P)-2009 3 Section 4. Test Requirements 4.1 Testing Procedure. Liquid-line Drier ratings shall be based on tests conducted in accordance with the procedure outlined in ANSI/ASHRAE Standard 63.1. 4.1.1 If alternate te

29、st methods are used, the tester assumes the responsibility that results so obtained can be confirmed by ANSI/ASHRAE Standard 63.1. Section 5. Rating Requirements 5.1 Rating Requirements. Liquid-line Driers shall be rated by their Water Capacity, drops, and Refrigerant Flow Capacity at 1.0 psi Pressu

30、re Drop, tons, and shall include their ratings at the Standard Rating Conditions in Table 2. Table 2. Published Ratings Standard Rating Conditions Standard Temperature Water in Refrigerant EPD Refrigerant No. F ppm 75 15 R-12 125 15 75 60 R-22 125 60 75 50 R-134a 125 50 75 50 R-245fa 125 50 75 50 R-

31、404A 125 50 75 50 R-407C 125 50 75 50 R-410A 125 50 75 30 R-502 125 30 75 50 R-507A 125 50 5.2 Water Capacity ratings shall be determined in accordance with the rating procedure outlined in 5.2.1 and statistical method outlined in 5.3. 5.2.1 Rating Procedure. 5.2.1.1 Preliminary. The preliminary Wat

32、er Capacity of a Liquid-line Drier should be determined by the test procedure outlined in ANSI/ASHRAE Standard 63.1. Two Liquid-line Driers for each Standard Rating Condition should be sufficient for this determination. 5.2.1.2 Procedure. Three Liquid-line Driers are then preloaded at this predeterm

33、ined capacity. Duplicate EPD determinations are made for each Liquid-line Drier. The average EPD for each Liquid-line Drier and the overall average for the six determinations are then calculated. Another set of three Liquid-line Driers is then evaluated at an adjusted capacity, so that the overall a

34、verage EPDs of the two sets will bracket the Standard EPD. (Figure 1)5.2.1.2.1 In this procedure, duplicate EPD determinations per Liquid-line Drier are required. This procedure reduces the effect of variations inherent in the method. Most important, it provides a check on the precision of the metho

35、d. The maximum range for duplicate EPD determinations shall not exceed the values in Table 3. AHRI Standard 710 (I-P)-2009 4 Table 3. Maximum Range for Duplicate EPD DeterminationsR-12 3 ppmR-22 6 ppmR-134a 6 ppmR-245fa 5 ppmR-404A 6 ppmR-407C 6 ppmR-410A 6 ppmR-502 6 ppmR-507A 6 ppm5.2.1.2.2 If the

36、 above range is exceeded, the test data shall be discarded, and the test shall be repeated after the analytical procedure has been reviewed. 5.3. Statistical Method for Establishing Water Capacity Ratings. ANSI/ASHRAE Standard 63.1 gives a procedure for determining the Water Capacity of any refriger

37、ant Liquid-line Drier. This sub-section presents a statistical procedure applied to the results from testing sets of samples of production Liquid-line Driers to establish a rating which will be equaled or exceeded by 90% of those produced. 5.3.1 When several determinations of the EPD of a single Liq

38、uid-line Drier are made by the procedure of ANSI/ASHRAE Standard 63.1, a series of values will be obtained because of analysis procedure variations. The average of these results is more reliable than any single result. This average also becomes more reliable as more values are used in calculating th

39、e average. 5.3.2 When the average EPD of a second Liquid-line Drier is calculated from several determinations, this value may differ from the average of the first Liquid-line Drier because of manufacturing variations. The overall average of the two Liquid-line Driers is more representative of produc

40、tion Liquid-line Driers than is the average of a single Liquid-line Drier. The overall average of several Liquid-line Driers is still more representative. 5.3.3 In order to compensate for these testing and manufacturing variations, a statistical procedure is available for arriving at a rating that w

41、ill guarantee any percent compliance desired. 5.3.4 This rating procedure is a statistical analysis of results obtained from tests on a group of six Liquid-line Driers, and the rating obtained by this procedure will be such that the average Water Capacity of duplicate tests on any set of six Liquid-

42、line Driers will equal or exceed the rating in 90% of all cases. 5.3.4.1 The two EPD set averages are plotted on a graph, plotting capacity on the vertical axis and EPD on the horizontal axis. A straight line is drawn between these two points. A vertical line is drawn from the Standard EPD to the st

43、raight line. A horizontal line is then drawn from the point of intersection to the vertical axis. This point of intersection with the vertical axis gives the “set average“ at Standard EPD. (Figure 1) 5.3.4.2 The six individual “duplicate averages“ are now plotted on the same graph. The vertical dist

44、ance of each point from the straight line is determined in units of capacity. The maximum value above the line is added to the maximum value below the line. The sum of these values is called the “range.“ 5.3.4.3 By using the “set average,“ the “range“, and a multiplication factor of 0.36 taken from

45、statistical tables, the Water Capacity rating is calculated as follows: Water Capacity rating = A - 0.36 r Where: A = set average r = range 5.3.4.4 When Liquid-line Driers are preloaded at the rated Water Capacity, it can be guaranteed that at least 90% of averages of sets of six Liquid-line Driers,

46、 with duplicate tests for each Liquid-line Drier, will equal or exceed the rating.AHRI Standard 710 (I-P)-2009 5 5.4 Refrigerant Flow Capacity shall be based on the refrigerant flow rate through the Liquid-line Drier within the specified pressure drop and the refrigerant flow rate per ton of refrige

47、ration at 86oF liquid and 5.0oF saturated vapor. 5.4.1 The Refrigerant-Flow Capacity Rating is obtained by dividing the refrigerant flow rate expressed in lb/min at a Pressure Drop of 1.0 psi by the flow rate per refrigerating ton expressed in lb/min/ton as in Table 4 for the refrigerant used. Table

48、 4. Flow Rate per Ton of Refrigeration at 86F Liquid and 5.0F Saturated Vapor Refrigerant No. lb/min/ton R-12 4.0 R-2 3.R-134a 3.1 R-245fa 3.0 R-404A 4.1R-407C 3.0 R-410A 2.8 R-502 4.4 R-507A 4.25.5 Tolerances. To comply with this standard, measured test results shall not be less than 90% of Publish

49、ed Ratings for Refrigerant Flow Capacity and Water Capacity. Section 6. Minimum Data Requirements for Published Ratings 6.1 Minimum Data Requirements for Published Ratings. As a minimum, Published Ratings shall include all Standard Ratings. All claims to ratings within the scope of this standard shall include the statement “Rated in accordance with AHRI Standard 710 (I-P).” All claims to ratings outside the scope of this standard shall include the statement “Outside the scope of AHRI Standard 710 (I-P).” Wherever Application Ratings are published or printed, they sha