AHRI 870-2005 Performance Rating of Direct GeoExchange Heat Pumps.pdf

1、ANSI/AHRI Standard 870 (formerly ARI Standard 870)2005 Standard for Performance Rating of Direct GeoExchange Heat Pumps AHRI STANDARD 870-2005 (formerly ARI Standard 870-2005) WITH ADDENDUM 1, Performance Rating of Direct GeoExchange Heat Pumps June 2009 AHRI Standard 870-2005 with Addendum 1, Perfo

2、rmance Rating of Direct GeoExchange Heat Pumps, is comprised of only the shaded portions shown. The June 2009 Addendum 1 has beenincorporated into the already published 2005 version of AHRI Standard 870 to avoid confusion.Particular additions (shown shaded in the standard), deletions (shown with a s

3、trikethrough and shaded in the standard), and corrections (shown shaded in the standard) are as follows: 1 In Appendix C, equation C2 was corrected. System Capacity = qhx (3.412) (Wc+ Wah) = qcoolingAir-Conditioning, Heating, and Refrigeration Institute 2111 Wilson Blvd, Suite 500 Arlington, VA 2220

4、1 Price $10.00 (M) $20.00 (NM) Copyright 2005, by Air-Conditioning, Heating, and Refrigeration Institute Printed in U.S.A. Registered United States Patent and Trademark Office IMPORTANT SAFETY DISCLAIMER ARI does not set safety standards and does not certify or guarantee the safety of any products,

5、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 accordance with nationally recognized safety standards and code requirements approp

6、riate for products covered by this standard/guideline. ARI uses its best efforts to develop standards/guidelines employing state-of-the-art and accepted industry practices. ARI does not certify or guarantee that any tests conducted under its standards/guidelines will be non-hazardous or free from ri

7、sk. ARI CERTIFICATION PROGRAM PROVISIONS Scope of the Certification Program The certification program includes all factory made residential, commercial and industrial Direct Geoexchange Heat Pumps as defined in Section 3. It does not apply to the rating and testing of retrofit units. Certified Ratin

8、gs The following certification program ratings are verified by test at the Standard Rating Conditions: 1. Cooling Capacity, Btu/h 2. Energy Efficiency Ratio, EER, Btu/Wh 3. Heating Capacity, Btu/h 4. Coefficient of Performance, COP Note: This standard supersedes ARI Standard 870-2001. TABLE OF CONTE

9、NTS SECTION PAGE Section 1. Purpose 1 Section 2. Scope .1 Section 3. Definitions .1 Section 4. Classification .3 Section 5. Test and Rating Requirements .3 Section 6. Minimum Data Requirements for Published Ratings 6 Section 7. Operating Requirements 6 Section 8. Marking and Nameplate Data 8 Section

10、 9. Conformance Conditions .8 Check page numbers TABLES Table 1. Classification of Direct Geoexchange Heat Pumps .3 Table 2. Minimum External Resistance 5 APPENDICES Appendix A. References - Normative .9 Appendix B. References - Informative .9 Appendix C. Outdoor Water Coil Method of Testing Direct

11、Geoexchange Heat Pumps for Capacity - Informative .10 FIGURES FOR APPENDICES Figure C1. Outdoor Water Coil Test Set-Up for Direct Geoexchange Heat Pumps .10 _ ANSI/AHRI STANDARD 870-2005 1PERFORMANCE RATING OF DIRECT GEOEXCHANGE HEAT PUMPS SECTION 1. PURPOSE 1.1 Purpose. The purpose of this standard

12、 is to establish for Direct Geoexchange Heat Pumps: definitions; classification; test and rating requirements; minimum data requirements for Published Ratings; operating requirements; marking and nameplate data; and conformance conditions. 1.1.1 Intent. This standard is intended for the guidance of

13、the industry, including manufacturers, engineers, installers, contractors and users. 1.1.2 Review and Amendment. This standard is subject to review and amendment as technology advances. SECTION 2. SCOPE 2.1 Scope. This standard applies to factory made residential, commercial and industrial Direct Ge

14、oexchange Heat Pumps, as defined in Section 3. 2.1.1 Energy Source. This standard applies only to electrically-driven, mechanical compression type systems. 2.1.2 Alternative Applications. Equipment designed for rating under this standard may not be suitable for alternative applications covered in IS

15、O 13256-1. 2.2 Exclusions. This standard applies to the rating and testing of complete refrigeration systems and does not apply to individual assemblies for separate use. SECTION 3. DEFINITIONS All terms in this document shall follow the standard industry definitions in the current edition of ASHRAE

16、 Terminology of Heating, Ventilation, Air Conditioning and Refrigeration unless otherwise defined in this section. 3.1 Coefficient of Performance (COP). A ratio of the Cooling/Heating Capacity in watts W to the power input values in watts W at any given set of Rating Conditions expressed in watts/wa

17、tt W/W. For heating COP, supplementary resistance heat shall be excluded. 3.1.1 Standard Coefficient of Performance. A ratio of the capacity to power input value obtained at Standard Rating Conditions. 3.2 Cooling Capacity. The capacity associated with the change in air enthalpy which includes both

18、the Latent and Sensible Capacities expressed in Btu/h W. 3.2.1 Latent Capacity. Capacity associated with a change in humidity ratio. 3.2.2 Sensible Capacity. Capacity associated with a change in dry-bulb temperature. 3.3 Direct Geoexchange Heat Exchanger. A continuous sealed underground closed loop

19、heat exchanger with one refrigerant supply tube and one refrigerant return tube. More than one such Direct Geoexchange Heat Exchanger may be supplied with each heat pump and the Direct Geoexchange Heat Exchanger(s) may be factory or field assembled. ANSI/AHRI STANDARD 870-2005_ 2 3.4 Direct Geoexcha

20、nge Heat Pump. A heat pump consisting of one or more factory made assemblies which normally include an indoor conditioning coil with air moving means, compressor(s) and refrigerant-to-earth heat exchanger(s), including means to provide a heating function or a cooling function or both. The separate a

21、ssemblies shall be designed to be used together, and the requirements of rating outlined in the standard are based upon the use of matched assemblies. 3.4.1 Functions. Direct Geoexchange Heat Pumps shall provide the function of air-circulating, cooling and heating with controlled temperature, and ma

22、y include the functions of water heating, air-cleaning, dehumidifying or humidifying. Models designated as “cooling only“ units need not include the heating function, and models designated as “heating only“ units need not include the cooling function. 3.5 Energy Efficiency Ratio (EER). A ratio of th

23、e Cooling Capacity in Btu/h to the power input values in watts at any given set of Rating Conditions expressed in Btu/(Wh). 3.5.1 Standard Energy Efficiency Ratio. A ratio of the capacity to power input value obtained at Standard Rating Conditions. 3.6 Heating Capacity. The capacity associated with

24、the change in dry-bulb temperature expressed in Btu/h W. 3.7 Part-Load Rating. A rating based on tests performed at Part-Load Rating Conditions. 3.8 Published Rating. A statement of the assigned values of those performance characteristics, under stated Rating Conditions, by which a unit may be chose

25、n to fit its application. 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 heat pump or published in specifications, advertising or other lit

26、erature controlled by the manufacturer, at stated Rating Conditions. 3.8.1 Application Rating. A rating based on tests performed at application Rating Conditions (other than Standard Rating Conditions). 3.8.2 Standard Rating. A rating based on tests performed at Standard Rating Conditions. 3.9 Ratin

27、g Conditions. Any set of operating conditions under which a single level of performance results and which causes only that level of performance to occur. 3.9.1 Standard Rating Conditions. Rating Conditions used as the basis of comparison of performance characteristics. 3.10 “Shall“ or “Should“. “Sha

28、ll“ or “should“ shall be interpreted as follows: 3.10.1 Shall. Where “shall“ or “shall not“ is used for a provision specified, that provision is mandatory if compliance with the standard is claimed. 3.10.2 Should. “Should“ is used to indicate provisions which are not mandatory but which are desirabl

29、e as good practice. 3.11 Standard Air. Air weighing 0.075 lb/ft31.2 kg/m3 which approximates dry air at 70F 21C and at a barometric pressure of 29.92 in Hg 101.3 kPa. 3.12 Test Fluid. The liquid filling the test water coil. _ ANSI/AHRI STANDARD 870-2005 3 SECTION 4. CLASSIFICATION 4.1 Classification

30、. Direct Geoexchange Heat Pumps within the scope of this standard shall be classified as shown in Table 1. Table 1. Classification of Direct Geoexchange Heat Pumps ARI Type Arrangement* Designation Heating and Cooling Heating Only Cooling Only Split System HRCU-DGX-CB HORCU-DGX-CB HCRCU-DGX-CB FAN C

31、OMP EVAP COND Split System w/ No Indoor Fan HRCU-DGX-C HORCU-DGX-C HCRCU-DGX-C COMP EVAP COND *Denotes cooling mode function. SECTION 5. TEST AND RATING REQUIREMENTS 5.1 Standard Rating. Standard Ratings shall be established at the Standard Rating Conditions specified in 5.1.3. All Standard Ratings

32、shall be verified by tests conducted in accordance with ASHRAE Standard 37, and with the test methods and procedures as described in this standard except that the total Cooling and Heating Capacity shall be the average of the air enthalpy method and the water coil method. Standard Ratings of units w

33、hich do not have indoor air-circulating fans furnished as part of the model, i.e., split system with indoor coil alone (Table 1), shall be established by subtracting from the total Cooling Capacity 1,250 Btu/h/1,000 ft3/min 0.776 kW per m3/s, and by adding the same amount to the Heating Capacity. To

34、tal power input for both heating and cooling shall be increased by 365 W/1,000 ft3/min 0.776 kW per m3/s of indoor air handled. 5.1.1 Values of Standard Capacity Ratings. These ratings shall be expressed only in terms of Btu/h W in multiples of 100 30. 5.1.1.1 Standard Ratings relating to Cooling or

35、 Heating Capacities shall be net values, including the effects of circulating-fan heat, but not including supplementary heat. 5.1.2 Values of Standard Energy Efficiency Ratio or Coefficients of Performance. Standard Energy Efficiency Ratios for cooling, whenever published, shall be expressed in mult

36、iples of the nearest 0.1 Btu/(Wh) the nearest cooling COP in multiples of 0.1; Standard Coefficients of Performance for heating, whenever published, shall be expressed in multiples of the nearest 0.1. 5.1.2.1 In the determination of values of Standard Energy Efficiency Ratio or Coefficient of Perfor

37、mance, the power inputs to the compressor(s) and fan(s), plus controls and other items included as part of the model number(s) shall be used. 5.1.3 Standard Rating Conditions. The test conditions for Standard Ratings shall include the following: 5.1.3.1 Test Fluid. The liquid used in the test water

38、coil shall be water which has been freeze-protected with the addition of 15% methanol, by weight 5.1.3.2 Standard Rating Conditions. a. Cooling (not required for heating only models). Air temperature entering indoor portion of unit: 80.0F 26.7C dry-bulb, 67.0F 19.4C wet-bulb Air temperature surround

39、ing unit: 80.0F 26.7C dry-bulb ANSI/AHRI STANDARD 870-2005_ 4 Refrigerant temperature from test water coil (liquid line): 77.0F 25.0C b. Heating (not required for cooling only models). Air temperature entering indoor portion of unit: 70.0F 21.1C dry-bulb, 60.0F 15.6C wet-bulb. Air temperature surrou

40、nding unit: 70.0F 21.1C dry-bulb Refrigerant temperature from test water coil (vapor line) 32.0F 0C 5.1.3.3 Electrical Conditions. Standard Rating tests shall be performed at the nameplate rated voltage(s) and frequency. For heat pumps with dual nameplate voltage ratings, Standard Rating tests shall

41、 be performed at both voltages, or at the lower of the two voltages, if only a single Standard Rating is to be published. 5.1.3.4 Indoor-Side Air Quantity. All Standard Ratings shall be determined at an indoor-side air quantity, delivered against at least the minimum external resistance required by

42、5.1.3.6. All air quantities shall be expressed as ft3/min m3/s of Standard Air. a. Direct Geoexchange Heat Pumps shall be rated at the indoor-side air quantity delivered when operating against the minimum external resistance specified in 5.1.3.6 or at a lower indoor-side air quantity, if so specifie

43、d by the manufacturer. b. Heat pumps which do not incorporate an indoor fan, but are rated in combination with a device employing a fan shall be rated as described under a. above. For heat pumps of this class which are rated for general use to be applied to a variety of heating plants, the indoor-si

44、de air quantity shall be as specified by the manufacturer in his Standard Ratings, or the air quantity obtained through the indoor coil assembly when the pressure drop across the indoor coil assembly and the recommended enclosures and attachment means is not greater than 0.30 in H2O 75 Pa, whichever

45、 is less. Indoor-side air quantities as referred to herein apply to the air quantity experienced when the unit is cooling and dehumidifying under the Standard Rating Cooling Conditions specified in this section. Heating-only units shall use the air quantity experienced when the unit is operating und

46、er the Standard Rating Conditions. This air quantity shall be employed in all other tests prescribed herein without regard to resulting external static pressure, or if so specified by the manufacturer, the air quantity employed in all of the tests shall be that achieved at the external resistance em

47、ployed in the Standard Rating cooling test. 5.1.3.5 Requirements for Separated Assemblies. All Standard Ratings for heat pumps in which the compressor section is separated from the indoor section, as in Type HRCU (Table 1), shall be determined with at least 25.0 ft 7.62 m of interconnecting tubing o

48、n each line, of the size recommended by the manufacturer. Heat pumps in which the interconnecting tubing to the Direct Geoexchange Heat Exchanger is furnished as an integral part and a recommended length is furnished, shall be tested with the complete length of tubing furnished, or with 25.0 ft 7.62 m of tubing, whichever is greater. The line sizes, insulation and details of installation shall be in accordance with the manufacturers published recommendations. 5.1.3.6 Minimum External Resistances. Indoor air-moving equip