1、 AHRI Standard 711 (SI)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 se
2、t 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 ac
3、cordance 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 t
4、ests conducted under its standards/guidelines will be non-hazardous or free from risk. Note: This standard supersedes ARI Standard 710-2004. For I-P ratings, see AHRI Standard 710 (I-P)-2009. TABLE OF CONTENTS SECTION PAGE Section 1. Purpose1 Section 2. Scope.1 Section 3. Definitions.2 Section 4. Te
5、st 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 Dupli
6、cate EPD Determinations 4 Table 4. Flow Rate per kW of Refrigeration at 30C Liquid and -15C Saturated Vapor .5 FIGURES Figure 1. Example of Water Capacity Rating Calculation for Refrigerant 134a at 24C 6 Appendix A. References - Normative .7 Appendix B. References - Informative7 Appendix C. Guide fo
7、r Selecting a Liquid-line Drier - Informative.8 AHRI Standard 711 (SI)-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 f
8、or Published 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
9、as technology 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 refriger
10、ant systems 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-tetrafluoroeth
11、ane CH2FCF3R-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/
12、51.2 % wt. 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 p
13、rovides 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
14、 considered 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 a
15、bility to remove these acids. Therefore, while noting its importance, no consideration of acid removal is given in this standard at this time. AHRI Standard 711 (SI)-2009 2 2.4.2 Particulate Removal. Although many commercial Liquid-line Driers have filtering media, the subject of filtration is separ
16、ate and 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 Te
17、rminology 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
18、with respect 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 attainab
19、le by a 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
20、parts per 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 Pres
21、sure Drop. 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.
22、These values 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 manuf
23、acturer, 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 operat
24、ing conditions 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
25、 a flow 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 pro
26、vision 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, C. 3.11 Water Cap
27、acity. 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 or in grams on the basis of 20 drops per
28、gram. For the purpose of this standard, 2 drops of water per kilogram of refrigerant is assumed to be equal to 110 ppm. AHRI Standard 711 (SI)-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 outli
29、ned in ANSI/ASHRAE Standard 63.1. 4.1.1 If alternate test 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,
30、 drops, and Refrigerant Flow Capacity at 0.07 Bar Pressure Drop, kW, 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. C ppm 24 15 R-12 52 15 24 60 R-22 52
31、60 24 50 R-134a 52 50 24 50 R-245fa 52 50 24 50 R-404A 52 50 24 50 R-407C 52 50 24 50 R-410A 52 50 24 30 R-502 52 30 24 50 R-507A 52 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 Proced
32、ure. 5.2.1.1 Preliminary. The preliminary Water 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-lin
33、e Driers are then preloaded at this predetermined 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 a
34、t an adjusted capacity, so that the overall average 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 p
35、rovides a check on the precision of the method. The maximum range for duplicate EPD determinations shall not exceed the values in Table 3. AHRI Standard 711 (SI)-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
36、6 ppmR-502 6 ppmR-507A 6 ppm5.2.1.2.2 If the 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 de
37、termining the Water Capacity of any refrigerant 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 sever
38、al determinations of the EPD of a single Liquid-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 reliab
39、le as more values are used in calculating the 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-
40、line Driers is more representative of production 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
41、is available for arriving at a rating that will 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
42、of duplicate tests on any set of six Liquid-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 l
43、ine is drawn from the Standard EPD to the straight 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
44、plotted on the same graph. The vertical distance 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
45、 a multiplication factor of 0.36 taken from 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
46、 averages of sets of six Liquid-line Driers, with duplicate tests for each Liquid-line Drier, will equal or exceed the rating.AHRI Standard 711 (SI)-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 t
47、he refrigerant flow rate per kW of refrigeration at 30oC liquid and -15oC saturated vapor. 5.4.1 The Refrigerant-Flow Capacity Rating is obtained by dividing the refrigerant flow rate expressed in kg/min at a Pressure Drop of 0.07 Bar by the flow rate per refrigerating kW expressed in kg/min/kW as i
48、n Table 4 for the refrigerant used. Table 4. Flow Rate per kW of Refrigeration at 30C Liquid and -15C Saturated Vapor Refrigerant No. kg/min/kW R-12 0.52 R-2 0.38 R-134a 0.40 R-245fa 0.38 R-404A 0.53 R-407C 0.38 R-410A 0.36 R-502 0.57 R-507A 0.54 5.5 Tolerances. To comply with this standard, measure
49、d test results shall not be less than 90% of Published 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 711 (SI).” All claims to ratings outside the scope of this standard shall include the statement “Outside the scope of AHRI Standard 711 (SI).” Wherever Application
