ANSI/AHRI Standard Standard for Performance Rating of Indoor Pool Dehumidifiers

Transcription

1 ANSI/AHRI Standard Standard for Performance Rating of Indoor Pool Dehumidifiers Approved by ANSI on April 17, 2012

2 IMPORTANT SAFETY DISCLAIMER AHRI does not set 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 accordance 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 tests conducted under its standards/guidelines will be non-hazardous or free from risk. Note: This standard supersedes AHRI Price $10.00 (M) $20.00 (NM) Printed in U.S.A. Copyright 2011, by Air-Conditioning, Heating, and Refrigeration Institute Registered United States Patent and Trademark Office

3 TABLE OF CONTENTS SECTION PAGE Section 1. Purpose...1 Section 2. Scope...1 Section 3. Definitions...1 Section 4. Classification...2 Section 5. Test Requirements...3 Section 6. Rating Requirements...4 Section 7. Minimum Data Requirements for Published Ratings...7 Section 8. Operating Requirements...7 Section 9. Marking and Nameplate Data...8 Section 10. Conformance Conditions...8 TABLES Table 1. Classification of Indoor Pool Dehumidifiers...2 Table 2. Conditions for Standard Rating Tests and Operating Requirements...5 Table 3. Minimum External Resistance...6 Table 4. Basic Pumping Penalty (PP B ) vs. Liquid Flow Rate (WF)...6 APPENDICES Appendix A. References - Normative...9 Appendix B. References - Informative...9 Appendix C. Method of Test For Indoor Pool Dehumidifiers Normative. 10 TABLES FOR APPENDICES Table C1. Table C2. Table C3. Applicable Test Methods for Dehumidifying, Cooling, Reheating and/or Water Heating.15 Data To Be Recorded.23 Test Tolerances...25

4 FIGURES FOR APPENDICES Figure C1. Figure C2. Figure C3. Figure C4. Figure C5. Figure C6. Figure C7a. Figure C7b. Figure C7c. Figure C8. Tunnel Air-Enthalpy Test Method Arrangement 28 Loop Air-Enthalpy Test Method Arrangement...29 Calorimeter Air-Enthalpy Test Method Arrangement 30 Room Air-Enthalpy Test Method Arrangement.31 Airflow Measuring Apparatus Airflow Measuring Nozzle External Static Pressure Measurement (Up Flow) External Static Pressure Measurement (Horizontal Flow).35 External Static Pressure Measurement (Down Flow) 35 Plumbing Layout and Location of Water Temperature Measurements.36

5 ANSI/AHRI STANDARD PERFORMANCE RATING OF INDOOR POOL DEHUMIDIFIERS Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish for Indoor Pool Dehumidifiers: definitions; classifications; test requirements; rating requirements; minimum data requirements for Published Ratings; operating requirements; marking and nameplate data; and conformance conditions Intent. This standard is intended for the guidance of the industry, including manufacturers, engineers, installers, contractors and users 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 Indoor Pool Dehumidifiers, as defined in Section Energy Source. This standard applies to electrically operated, vapor-compression refrigeration systems. 2.2 Exclusions. This standard does not apply to the rating and testing of individual assemblies for separate use. Section 3. Definitions Definitions. All terms in this document follow the standard industry definitions in the current edition of ASHRAE Terminology of Heating, Ventilation, Air Conditioning and Refrigeration unless otherwise defined in this section. 3.1 Economizer. Factory made assembly installed in an electrically operated, vapor compression refrigeration system that takes advantage of favorable weather conditions to reduce cooling and thereby improve a building's energy performance by introducing up to 100% outside air into a building. 3.2 Indoor Pool Dehumidifier. A type of air-cooled or water-cooled electrically operated, vapor compression refrigeration system; factory assembled as a single package or split system, which includes an indoor cooling/dehumidifying coil, an air reheat coil, compressor(s) and an air moving device. It may also include a Refrigerant Heat Recovery Unit, an auxiliary refrigerant condenser, Economizer, and an air-to-air heat recovery device. It shall provide the function of dehumidifying, air circulation, air reheating and may include the function of air-cooling, air-cleaning, pool water heating and air-to-air heat recovery. 3.3 Moisture Removal Capacity (MRC). The amount of condensate produced by the unit which includes the effects of reheat coils, circulating fans and other components in the air stream; excluding supplementary heating, cooling or outdoor air; and expressed in kg of moisture/h. 3.4 Moisture Removal Efficiency (MRE). A ratio of the Moisture Removal Capacity in kg of moisture/h to the power input values in kw at any given set of Rating Conditions expressed in kg of moisture/kwh. 3.5 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 values apply to all units of like nominal size and type (identification) produced by the same manufacturer. As used herein, 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, at stated Rating Conditions Application Rating. A rating based on tests performed at application Rating Conditions (other than Standard Rating Conditions). 1

6 ANSI/AHRI STANDARD Standard Rating. A rating based on tests performed at Standard Rating Conditions. 3.6 Rating Conditions. Any set of operating conditions under which a single level of performance results and which causes only that level of performance to occur Standard Rating Conditions. Rating Conditions used as the basis of comparison for performance characteristics. 3.7 Refrigerant Heat Recovery Unit. A factory-made assembly of elements by which refrigerant vapor flow and water flow are maintained in such heat transfer relationship that the refrigerant vapor is desuperheated and the water is heated. 3.8 "Shall" or "Should." "Shall" or "should" shall be interpreted as follows: Shall. Where "shall" or "shall not" is used for a provision specified, that provision is mandatory if compliance with the standard is claimed Should. "Should" is used to indicate provisions which are not mandatory but which are desirable as good practice. 3.9 Standard Air. Air weighing 1.2 kg/m 3 which approximates dry air at 21.0 C and at a barometric pressure of kpa. Section 4. Classification Equipment covered within the scope of this standard shall be classified as shown in Table 1. Table 1. Classification of Indoor Pool Dehumidifiers Designation AHRI Type Arrangement Single Package Indoor SPI FAN EVAP COMP REHEAT SPI-PH FAN COMP POOL HEAT EVAP REHEAT Single Package Indoor Water-Cooled SPI-W FAN COMP EVAP REHEAT COND SPI-W-PH FAN COMP POOL HEAT EVAP REHEAT COND Single Package Indoor Air-Cooled SPI-A SPI-A-PH FAN COMP EVAP REHEAT COND FAN COMP POOL HEAT EVAP REHEAT COND 2

7 ANSI/AHRI STANDARD Table 1 (continued). Classification of Indoor Pool Dehumidifiers Designation AHRI Type Arrangement Split System Indoor Air-Cooled SSI-A SSI-A-PH FAN COMP EVAP REHEAT COND FAN COMP POOL HEAT COND EVAP REHEAT Single Package Indoor with Economizer SPI-E SPI-PH-E FAN COMP EVAP REHEAT ECONOMIZER FAN COMP POOL HEAT EVAP REHEAT ECONOMIZER Single Package Indoor Water-Cooled with Economizer SPI-W-E SPI-W-PH-E FAN COMP EVAP REHEAT COND ECONOMIZER FAN COMP POOL HEAT EVAP REHEAT COND ECONOMIZER Single Package Indoor Air-Cooled with Economizer SPI-A-E SPI-A-PH-E FAN COMP EVAP REHEAT COND ECONOMIZER FAN COMP POOL HEAT EVAP REHEAT COND ECONOMIZER Split System Indoor Air-Cooled with Economizer SSI-A-E SSI-A-PH-E FAN COMP COND EVAP REHEAT ECONOMIZER FAN COMP POOL HEAT COND EVAP REHEAT ECONOMIZER Section 5. Test Requirements 5.1 Test Requirements. Published Ratings shall be verified by tests conducted in accordance with the test method described in Appendix C and at the Rating Conditions in Section Equipment. Indoor Pool Dehumidifiers shall be tested using all components as recommended by the manufacturer. 3

8 ANSI/AHRI STANDARD Electrical Conditions. Nameplate voltages for 60 Hz systems are shown in Table 1 of AHRI Standard 110. Nameplate voltages for 50 Hz systems shall include one or more of the utilization voltages shown in Table 1 of IEC Standard Tests shall be performed at the nameplate rated voltages and frequencies unless otherwise specified in this standard. For equipment which is rated with 208/230 dual nameplate voltages, standard rating tests shall be performed at 230 V. For all other dual nameplate voltage equipment covered by this standard, the standard rating tests shall be performed at both voltages or at the lower voltage if only a single Standard Rating is to be published. Section 6. Rating Requirements 6.1 Standard Ratings. Standard Ratings shall be established at the Standard Rating Conditions specified in Table 2 and in All Standard Ratings shall be verified by tests in accordance with Section Values of Standard Ratings. Standard Ratings relating to Moisture Removal Capacity shall be a net value, including the effects of circulating fan heat, but not including supplementary heat. Power input shall be the total power input for the operation of the compressor(s), fan(s), control(s), safety device(s), pump power adjustment (Table 2) and other items required as part of the system for normal operation excluding heating devices. Airflow rates shall be expressed in m 3 /h of Standard Air to the nearest 20.0 m 3 /h. Capacity Designation shall be expressed in W and kg of moisture/h to the nearest 0.1. Moisture Removal shall be expressed in kg of moisture/h to the nearest 0.1. Moisture Removal Efficiency shall be expressed in kg of moisture/kwh to the nearest 0.1. Water flow rate shall be expressed in L/s to the nearest 0.01 L/s up to and including 1 L/s and to the nearest 0.05 L/s for over 1 L/s. Water pressure drop shall be expressed to the nearest 4.0 kpa. 4

9 ANSI/AHRI STANDARD Table 2. Conditions for Standard Rating Tests and Operating Requirements Unit Configurations for Testing 6 Return Air Entering Dry-Bulb C Wet-Bulb C Outdoor Liquid Temperature Entering Heat Exchanger 1 Ambient 3 Pool Water Chiller Other Liquid Dry-Bulb C C C C A 100% Internal Air Rejection N/A N/A N/A N/A Dehumidification B 100% Remote Rejection or C Internal Air Plus Pool Water Rejection or or Another Rejection 7 Maximum High-Temperature Operating Conditions or Insulation Effectiveness Notes: 1. Unit inlet water flow rate shall be specified by the manufacturer C dry-bulb and 22.0 C wet-bulb is equivalent to 60% RH at sea level. 3. The wet-bulb temperature condition is not required when testing air-cooled condensers which do not evaporate condensate C dry-bulb and 29.0 C wet-bulb is equivalent to 80% RH at sea level C dry-bulb and 25.0 C wet-bulb is equivalent to 80% RH at sea level. 6. Manufacturer must select at least configuration A or C as a minimum certification requirement. B can be added to either configuration A or C. 7. Manufacturer must list both means of simultaneous methods of refrigerant heat rejection. 8. When testing with a dry cooler. 6.3 Standard Rating Conditions. The conditions of test for Standard Ratings shall be established at the Standard Rating Conditions specified in Table Indoor-side airflow rate shall be determined at an indoor-side airflow rate outlined below Ducted equipment shall be tested at the airflow rate delivered when operating against the minimum external static pressure specified in Table 3 or at a lower airflow rate if so specified by the manufacturer. Nonfiltered ducted equipment shall be tested at the airflow rate delivered when operating against the minimum external static pressure specified in Table 3 with an additional 0.02 kpa of external static pressure Non-ducted equipment shall be tested at the airflow rates obtained at zero external static pressure. All power consumed by the fan(s) shall be included in the power input to the unit The manufacturer shall specify a single airflow rate for all tests required in this part of the standard unless the equipment provides automatic adjustment of airflow rate. A separate control signal output for each step of airflow rate shall be considered as an automatic adjustment. 5

10 ANSI/AHRI STANDARD Table 3. Minimum External Resistance Standard Dehumidifier Airflow Minimum External Resistance 1 m 3 /h kpa > For units tested without an air filter installed, increase the applicable tabular value by 0.02 kpa Outdoor-side airflow rate shall be determined at the outdoor-side airflow rate specified by the manufacturer where the fan drive is adjustable. Where the fan drive is non-adjustable, ratings shall be determined at the outdoorside airflow rate inherent in the equipment when operated with all of the resistance elements associated with inlets, louvers, and any ductwork and attachments considered by the manufacturer as normal installation practice. Once established, the outdoor-side air circuit of the equipment shall remain unchanged throughout all tests prescribed herein. Airflow rates shall be expressed in m 3 /h of Standard Air Liquid Flow Rates For Indoor Pool Dehumidifiers with integral liquid pumps, ratings shall be determined at a liquid flow rate specified by the manufacturer For Indoor Pool Dehumidifiers without integral liquid pumps, ratings shall be determined at a liquid flow rate specified by the manufacturer The manufacturer shall specify a single liquid flow rate for all of the tests required in this part of the standard unless automatic adjustment of the liquid flow rate is provided by the equipment. A separate control signal output for each step of liquid flow rate will be considered as an automatic adjustment Power Input of Liquid Pumps. If a unit has a Refrigerant Heat Recovery Unit, a pump power adjustment is to be added to the power consumed by the unit, using the following formula: PP = WF [(PP B ΔP) + C] 1 Where: C = 400 W/(L/s) based on 6.0 m external head. PP = pump power adjustment, W PP B = basic pumping penalty (Table 4), W/ (L/s kpa) ΔP = water-pressure drop measured across liquid heat exchanger, kpa WF = liquid flow rate, L/s Table 4. Basic Pumping Penalty (PP B ) vs. Liquid Flow Rate (WF) Pumping Power Water flow Rate (WF) Adjustment(PP B ) L/s W/( L/s kpa) and above

11 ANSI/AHRI STANDARD Requirements for Separated Assemblies. All Standard Ratings for Indoor Pool Dehumidifiers in which the outdoor section is separated from the indoor section, as in Types SSI-A, SSI-A-PH, SSI-A-E and SSI-A-PH-E (Section 4), shall be determined with at least 7.6 m of interconnecting tubing on each line, of the size recommended by the manufacturer. Such dehumidifiers in which the interconnecting tubing is furnished as an integral part of the machine not recommended for cutting to length shall be tested with the complete length of tubing furnished, or with 7.6 m of tubing, whichever is greater. The line sizes, insulation and details of installation shall be in accordance with the manufacturer's published recommendations Test Liquid. The test liquid for Indoor Pool Dehumidifiers shall be water and sufficiently free of gas to ensure that the measured result is not influenced by its presence. 6.4 Application Ratings. Ratings at conditions other than those specified in 6.3 may be published as Application Ratings, and shall be based upon data determined by the method of testing described in Section Publication of Ratings. Wherever Application Ratings are published or printed, they shall include or be accompanied by the Standard Rating, clearly designated as such, including a statement of the conditions at which the ratings apply. 6.6 Tolerances. To comply with this standard, Published Ratings shall be based on data obtained in accordance with the provisions of Sections 5 and 6 of this standard and shall be such that any production unit, when tested, shall meet these ratings within the following tolerances: Moisture Removal Capacity and Moisture Removal Efficiency shall not be less than 95 percent of the Published Rating. Section 7. Minimum Data Requirements for Published Ratings 7.1 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 910. All claims to ratings outside the scope of this standard shall include the statement Outside the scope of AHRI Standard 910. Wherever Application Ratings are published or printed, they shall include a statement of the conditions at which the ratings apply Moisture Removal Capacity Designations. Moisture Removal Capacity used in published specifications, literature or advertising, controlled by the manufacturer, for equipment rated under this standard, shall be expressed in kg of moisture/h at the Standard Rating Conditions specified in Section Moisture Removal Efficiency Designations. Moisture Removal Efficiencies used in published specifications, literature or advertising, controlled by the manufacturer, for equipment rated under this standard, shall be expressed in kg of moisture/kwh at the Standard Rating Conditions specified in Section Net Sensible Cooling Capacity if applicable, kw Total Heat of Rejection to Indoor Air, kw Total Heat of Rejection to Outdoor Air if applicable, kw Total Heat of Rejection to Liquid if applicable, kw Total Input Power, kw. Section 8. Operating Requirements 8.1 Operating Requirements. To comply with this standard, any production unit shall meet the requirements detailed herein. 8.2 Maximum High-Temperature Operating Conditions Test. Indoor Pool Dehumidifier equipment shall pass the maximum high-temperature operating conditions test with an indoor-side and an outdoor-side airflow rate as specified in 7

12 ANSI/AHRI STANDARD Sections and respectively. In all cases, the equipment shall be set to prevent the use of reheat or desuperheat or a source of heat rejection Temperature Conditions. Temperature conditions shall be maintained as specified in Table Voltages. Tests shall be run at the minimum and maximum utilization voltages of Voltage Range B as shown in Table 1 of AHRI Standard 110, at the unit's service connection and at rated frequency Procedure The equipment shall be operated continuously for one hour at the temperature conditions and voltage(s) specified All power to the equipment shall be interrupted for a period sufficient to cause the compressor to stop (not to exceed five seconds) and then be restored Requirements During the test, the equipment shall operate without failure of any of its parts The equipment shall resume continuous operation within one hour of restoration of power and shall then operate continuously for one hour. Operation and resetting of safety devices prior to establishment of continuous operation is permitted Equipment with liquid heat exchangers shall be capable of operation under the maximum conditions at a water-pressure drop not to exceed 100 kpa measured across the exchanger. 8.3 Insulation Effectiveness Test. Indoor Pool Dehumidifiers shall pass the insulation effectiveness test when operating with indoor-side and outdoor-side airflow rates as specified in and 6.3.2, also with controls, dampers and grills set to produce the maximum tendency to sweat, provided such settings are not contrary to the manufacturer's instructions to the user Temperature Conditions. Temperature conditions shall be maintained as specified in Table Procedure. After establishment of the specified temperature conditions, the unit shall be operated continuously for a period of four hours Requirements. During the test, no condensed water shall drip, run, or blow off from the unit s casing. 8.4 Tolerances. The conditions for the tests outlined in Section 8 are average values subject to tolerances stated in Appendix C. Section 9. Marking and Nameplate Data 9.1 Marking and Nameplate Data. As a minimum, the nameplate shall display the manufacturer s name, model designation, and electrical characteristics. Nameplate voltages for 60 Hz systems shall include one or more of the equipment nameplate voltage ratings shown in Table 1 of AHRI Standard 110. Nameplate voltages for 50 Hz systems shall include one or more of the utilization voltages shown in Table 1 of IEC Standard Section 10. Conformance Conditions 10.1 Conformance. While conformance with this standard is voluntary, conformance shall not be claimed or implied for products or equipment within the standard s Purpose (Section 1) and Scope (Section 2) unless such product claims meet all of the requirements of the standard and all of the testing and rating requirements are measured and reported in complete compliance with the standard. Any product that has not met all the requirements of the standard shall not reference, state, or acknowledge the standard in any written, oral, or electronic communication. 8

13 ANSI/AHRI STANDARD APPENDI A. REFERENCES - NORMATIVE A1 Listed here are all standards, handbooks and other publications essential to the formation and implementation of the standard. All references in this appendix are considered as part of the standard. A1.1 AHRI Standard , Air-Conditioning and Refrigerating Equipment Nameplate Voltages, Air- Conditioning, Heating, and Refrigeration Institute, 2002, 2111 Wilson Blvd., Suite 500, Arlington, VA 22201, U.S.A. A1.2 ANSI/ASHRAE Standard , Methods of Testing for Rating the Performance of Positive Displacement Refrigerant Compressors and Condensing Units That Operate at Subcritical Temperatures, 2010, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, N.E., Atlanta, GA 30329, U.S.A. A1.3 ANSI/ASHRAE Standard , Methods of Testing for Rating Electrically Driven Unitary Air- Conditioning and Heat Pump Equipment, 2009, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, N.E., Atlanta, GA , U.S.A. A1.4 ANSI/ASHRAE Standard (RA 2009), Standard Method for Temperature Measurement, 2006, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, N.E., Atlanta, GA 30329, U.S.A. A1.5 ANSI/ASHRAE Standard (RA 2006), Standard Method for Measurement of Moist Air Properties, 2006, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, N.E., Atlanta, GA , U.S.A. A1.6 ANSI/ASHRAE Standard (RA 2006), Calorimeter Test Methods for Mass Flow Measurements of Volatile Refrigerants, 2006, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, N.E., Atlanta, GA , U.S.A. A1.7 ANSI/ASHRAE/AMCA Standard ANSI/AMCA Standard , Laboratory Methods of Testing Fans for Aerodynamic Performance Rating, 1999, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, N.E., Atlanta, GA , U.S.A., Air Movement and Control Association International, Inc., 30 West University Drive, Arlington Heights, Il U.S.A. A1.8 ASHRAE Handbook, 2009 Fundamentals Volume, 2009, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, N.E., Atlanta, GA 30329, U.S.A. A1.9 ASHRAE Standard , Standard Methods of Measurement of Flow of Liquids in Pipes Using Orifice Flowmeters, 1989, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, N.E., Atlanta, GA 30329, U.S.A. A1.10 ASHRAE Terminology of Heating, Ventilation, Air Conditioning and Refrigeration, 1991, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, N.E., Atlanta, GA 30329, U.S.A. A1.11 IEC Standard 60038, IEC Standard Voltages, 2002, International Electrotechnical Commission, 3, rue de Varembe, P.O. Box 131, 1211 Geneva 20, Switzerland. APPENDI B. REFERENCES - INFORMATIVE None. 9

14 ANSI/AHRI STANDARD APPENDI C. METHOD OF TEST FOR INDOOR POOL DEHUMIDIFIERS - NORMATIVE C1 Purpose. The purpose of this appendix, which is substantively based on ANSI/ASHRAE Standard 37, is to provide test methods for determining the moisture removal, pool water heating, air-cooling capacity, air reheating capacity and power input of Indoor Pool Dehumidifiers. C1.1 These test methods do not specify methods of establishing ratings which involve factors such as manufacturing tolerances and quality control procedures. C2 Instrumentation. C2.1 Temperature Measuring Instruments. C2.1.1 All temperature measurements (with the exception of dew point temperature) shall be made in accordance with ANSI/ASHRAE Standard C2.1.2 All air temperature measurements are to be taken upstream of static pressure taps on the inlet and downstream of the static pressure taps on the outlet. C2.2 Pressure Measuring Instruments. C2.2.1 Pressure measurements shall be made with one or more of the following instruments: a. Liquid column b. Bourdon tube gauge c. Electronic pressure transducer C2.2.2 The accuracy of the pressure measuring instruments shall permit measurements within 2.5% of the reading. C2.2.3 Calibration of the Bourdon tube gauge and electronic pressure transducers shall be with respect to a dead-weight tester or by comparison with a liquid column. C2.2.4 The smallest scale division of the pressure measuring instrument shall not exceed 2 times the specified accuracy. C2.3 Air Differential Pressure and Airflow Measurements. C2.3.1 The static pressure difference across nozzles and velocity pressures at nozzle throats shall be measured with pressure measuring instruments which have been calibrated against a standard to ±1.0% of the reading. The smallest scale division/precision shall not exceed 2.0% of the reading. C2.3.2 Duct static pressure shall be measured with one or more pressure measuring instruments having an accuracy of ±0.003 kpa. C2.3.3 Areas of nozzles shall be determined by measuring their diameters to within 0.2% in four places approximately equally spaced around the nozzle in each of two planes through the nozzle throat, one at the outlet and the other in the straight section near the radius. C2.4 Electrical Instruments. C2.4.1 Electrical measurements shall be made with indicating or integrating instruments. C2.4.2 Instruments used for measuring the electrical power input to fan motors, compressor motors, or other equipment accessories shall be accurate to ±2.0% of the indicated value. 10

15 ANSI/AHRI STANDARD C2.4.3 Instruments used for measuring the electrical power input to heaters or other apparatus furnishing heat loads shall be accurate to ±1.0% of the quantity measured. C2.4.4 Voltages shall be measured at the equipment terminals. Instruments used for measuring voltages shall be accurate to ±1.0% of the quantity measured. C2.5 Volatile Refrigerant Flow Measurement. C2.5.1 Volatile refrigerant flow shall be measured with an integrating flow measuring system having an accuracy of ±1.0% of the indicated value. C2.6 Liquid Flow Measurement. C2.6.1 Water flow rates shall be measured with a liquid flow meter or quantity meter having an accuracy of ±1.0% of the indicated value in accordance with ASHRAE Standard C2.6.2 Condensate collection rates shall be determined using a liquid quantity meter having an accuracy of ±1.0% of the indicated value. C2.7 Speed Measuring Instruments. C2.7.1 Speed measurements shall be made with a revolution counter, tachometer, stroboscope, or oscilloscope having an accuracy of ±1.0% of the indicated value. C2.8 Time and Mass Measurements. C2.8.1 Time interval measurements shall be made with an instrument having an accuracy of ±0.2% of the indicated value. C2.8.2 Mass measurements shall be made with an instrument having an accuracy of ±1.0% of the indicated value. C3 Airflow and Air Differential Pressure Measurement Apparatus. C3.1 Air-Enthalpy Apparatus. Recommended configurations for the test apparatus are provided below. In all cases, suitable means for determining the dry-bulb temperature and water vapor content of the air entering and leaving the unit and for measuring the external resistance to airflow shall be provided. C3.1.1 The arrangement for the tunnel air-enthalpy test method is shown schematically in Figure C1. An airflow measuring device is attached to the equipment air discharges (indoor or outdoor, or both, as applicable). This device discharges directly into the test room or space, which is provided with suitable means for maintaining the air entering the unit at the desired wet-bulb and dry-bulb temperatures. C3.1.2 An arrangement for a typical loop air-enthalpy test method arrangement is shown schematically in Figure C2. The unit is installed as it would be for the tunnel arrangement. The airflow measuring device discharge is connected to suitable reconditioning equipment that is, in turn, connected to the equipment inlet. The resulting closed test loop shall be sealed so that air leakage at places that would influence capacity measurements does not exceed 1.0% of the test airflow rate. The dry-bulb and wet-bulb temperatures of the air surrounding the equipment shall be maintained to within 3.0 C of the specified indoor and outdoor conditions. C3.1.3 The arrangement for the calorimeter air-enthalpy test method is shown schematically in Figure C3. In this arrangement, an enclosure is placed over the equipment, or applicable part of the equipment, under test. This enclosure may be constructed of any suitable material, but shall be non-hygroscopic and should be airtight and insulated. It should be large enough to permit inlet air to circulate freely between the equipment and the enclosure, and in no case shall the enclosure be closer than 150 mm to any part of the equipment. The inlet to the enclosure should be remotely located from the equipment inlet so as to cause circulation throughout the entire enclosed space. An airflow measuring device is connected to the equipment discharge. Wet-bulb and dry-bulb temperatures of the air entering the equipment are to be determined at the enclosure inlet. 11

16 ANSI/AHRI STANDARD C3.1.4 The room air-enthalpy test method arrangement is shown in Figure C4. An airflow measuring device is attached to the equipment air discharge (evaporator or condenser, as applicable) and then, in turn, connected to suitable reconditioning equipment. The discharge from the reconditioning apparatus provides air to the test room at the desired wet-bulb and dry-bulb temperatures. C3.1.5 The arrangements shown in Figures C1, C2, C3, and C4 are intended to illustrate various possibilities available and should not be construed as applying specifically or solely to the types of equipment with which they are shown. However, an enclosure as shown in Figure C3 must be used when the compressor is in the indoor section and separately ventilated. C3.1.6 Other means of handling the air leaving the airflow measuring device and supplying air at the proper conditions to the equipment inlet may be employed provided that they do not interfere with the prescribed means of measuring airflow rate, temperature, and external resistance and provided that they do not create abnormal conditions surrounding the equipment. C3.2 Airflow Measuring Apparatus. C3.2.1 As shown in Figure C5, the airflow measuring apparatus basically consists of a receiving chamber and a discharge chamber separated by a partition in which one or more nozzles are located. Air from the equipment under test is conveyed via duct to the receiving chamber, passes through the nozzle or nozzles, and is then exhausted to the test room or channeled to the room conditioning apparatus. C3.2.2 The airflow measuring apparatus and its connections to the equipment outlet shall be sealed so that the air leakage does not exceed 1.0% of the airflow rate being measured. C3.2.3 The center-to-center distance between nozzles in use shall not be less than three times the throat diameter of the largest nozzle, and the distance from the center of any nozzle to the nearest discharge or receiving chamber side wall shall be not less than 1.5 times its throat diameter. C3.2.4 Diffusers shall be installed in the receiving chamber located at least 1.5 times the largest nozzle throat diameter upstream of the partition wall. Diffusers in the discharge chamber shall be located at least 2.5 times the largest nozzle throat diameter downstream of the exit plane of the largest nozzle. C3.2.5 An exhaust fan, capable of providing the desired static pressure at the equipment outlet, shall be installed in one wall of the discharge chamber, and means shall be provided to vary the capacity of this fan. C3.2.6 The static pressure drop across the nozzle or nozzles shall be measured with a pressure measuring instrument. One side of the pressure measuring instrument shall be connected to four manifolded pressure taps installed within the receiving chamber. The other side of the pressure measuring device shall be connected to four manifolded pressure taps installed within the discharge chamber. Alternately, the velocity head of the airstream leaving the nozzle or nozzles may be measured by a pitot tube as shown in Figure C5, but when more than one nozzle is in use, the pitot tube reading shall be determined for each nozzle. C3.2.7 Recommendations on how to fabricate and manifold the static pressure taps, if used in measuring air volume rate, are provided in C3.5. Guidance on the placement of the static pressure taps and the position of the diffusion baffle relative to the receiving chamber inlet is provided in Figure 12 of ANSI/ASHRAE Standard 51. C3.2.8 Means shall be provided to determine the air density at the nozzle throat. C3.3 Nozzles. C3.3.1 The throat air velocity of any nozzle in use shall be not less than 15 m/s or more than 36 m/s. 12 C3.3.2 When nozzles are constructed in accordance with Figure C6, and installed in accordance with C3.2 and C3.3, they may be used without calibration. If the throat diameter is 250 mm or larger, the coefficient of discharge (C) may be assumed to be For nozzles smaller than 250 mm in diameter, the values calculated as specified in C3.3.3 may be used. Additional information and guidance on evaluation of the coefficient of discharge is provided in ANSI/ASHRAE Standard 51. (Appendix F of ANSI/ASHRAE Standard 51, for

17 ANSI/AHRI STANDARD example, shows the iterative procedure for evaluating the coefficient of discharge.) Where a more precise coefficient is desired, the nozzle should be calibrated. C3.3.3 For airflow nozzles having a throat length to throat diameter ratio of 0.6 (Figure C6), the nozzle default coefficient of discharge shall be calculated as follows: C = C1 Re Re For Reynolds numbers (Re) of 12,000 and above, the Reynolds number is calculated as follows: Re = DV a µν ' n 1 D ' = ( C Pν ν n ) 1000 µν 2 ' n = ( ) D P + ν 1 C µ ν n W n C2 where V is expressed in units of m/s and D in units of mm. The dynamic viscosity (µ) of gaseous air behaving as an ideal gas at moderate pressures and temperatures is calculated using the following equation: = 6 µ ( ) 10 + a where µ is expressed in kg/m s and t a in C. C3.4 External Static Pressure Measurements. C3.4.1 General. t C3 C transducer. C External static pressure shall be measured by a manometer or an electronic pressure Static pressure taps, where used, shall be fabricated and manifolded as described in C3.5. C3.4.2 Units with Fan and Single Outlet. C Where an external static pressure measurement is required, a short plenum chamber shall be attached to the outlet of the discharge side of the equipment, as shown in Figure C7a, C7b, or C7c. This plenum shall have cross-sectional dimensions equal to the dimensions of the equipment outlet and shall discharge into an airflow measuring device, as shown in Figure C5 (or into a suitable dampening device when a direct airflow measurement is not employed, C ). One side of the pressure measuring device shall be connected to four manifolded pressure taps in the discharge plenum. These taps shall be positioned a distance of twice the mean geometric cross-sectional dimension from the equipment outlet, as shown in Figure C7a, C7b, or C7c. C If space within the test room permits, an inlet duct connection should be installed. If used, the inlet duct shall have cross-sectional dimensions equal to those of the equipment and should otherwise be fabricated as shown by the setups given in Figures C7b and C7c. One side of the pressure measuring device described in C shall be connected to four manifolded pressure taps installed within the inlet duct. If no inlet duct connection is employed, however, one side of the pressure measuring device described in C shall be open to the surrounding atmosphere. C3.4.3 Units with Fans and Multiple Outlets and/or Multi-Evaporators. C Units with multiple discharge outlet duct connections or multi-evaporator systems shall have a short plenum, conforming to Figure C7a or C7b as applicable, attached to each outlet. Each plenum shall discharge into a single common duct section. If air volume rate is to be measured 13

18 ANSI/AHRI STANDARD directly, then this duct section shall discharge into an airflow measuring device. For purposes of equalizing the static pressure in each plenum, an adjustable restrictor shall be located in the plane where each plenum enters the common duct section. External static pressure in each plenum shall be measured as specified in C Multiple blower units employing a single discharge duct connection flange shall be tested with a single outlet duct in accordance with C Any other test plenum arrangements shall not be used except to simulate duct designs specifically recommended by the equipment manufacturer. C3.5 Recommended Practices for Static Pressure Measurements. C3.5.1 A tap should be located at the center of each face of each plenum, if rectangular, or at four evenly distributed locations along the perimeter of an oval or round plenum. C3.5.2 It is recommended that the pressure taps consist of 6.3mm diameter nipples soldered to the outer plenum surfaces and centered over 1 mm diameter holes through the plenum. The edges of these holes should be free of burrs and other surface irregularities. C3.6 Duct Insulation and Sealing Requirements. C3.6.1 The plenum(s) and duct section(s) shall be sealed to prevent air leakage, particularly at the connections to the equipment and the air measuring device. The plenum(s) and duct section(s) shall be insulated to minimize heat leakage between the equipment inlet and outlet and the temperature measuring instruments. Duct losses may be calculated using suitable conduction factors, inside air and outside ambient temperature difference, and the total duct surface area between the unit and the temperature measuring location. C4 Water-Side Measurement. C4.1 Water-Side Calculations. Calculate pool water heating capacity as q pw = c w w pw (t w6 - t w5 ) C4 Calculate condenser water-side capacity as q cw = c w w cw (t w4 - t w3 ) C5 C5 Methods of Testing and Calculation. C5.1 Standard Test Methods. C5.1.1 The following two test methods for measuring space conditioning capacity are covered in this standard: a. Indoor Air-Enthalpy Method (C5.4) b. Compressor Calibration Method (C5.5) Section C5.3 describes a method for measuring cooling condensate and determining Moisture Removal Capacity. Use of C5.3 is not required except when testing equipment having a rated Moisture Removal Capacity of 23.0 kg/h or greater where the indoor air-enthalpy method is not used. C5.2 Applicability of Test Methods. C5.2.1 Simultaneous tests using the indoor air-enthalpy method and one other method prescribed in Table C1 shall be conducted when testing equipment rated as having a total Moisture Removal Capacity that is less than 23.0 kg/h. 14 C5.2.2 Simultaneous tests using the cooling condensate and indirect airflow measurement method and the indoor air-enthalpy method shall be conducted when testing equipment rated as having a total Moisture

19 ANSI/AHRI STANDARD Removal Capacity equal to or greater than 23 kg/h. For cases where the indoor airflow rate cannot be directly measured, the compressor calibration method must be used. C5.2.3 The methods described in this standard may be used to test Indoor Pool Dehumidifier equipment not covered in Table C1. However, proper consideration must be given in the capacity calculations to adhere to energy balance principles. Table C1 - Applicable Test Methods for Dehumidifying, Cooling, Reheating and/or Water Heating Component Arrangement Method of Heat Rejection Indoor Air-Enthalpy Method Compressor Calibration Method 1 Single Package Indoor Single Package Indoor Water-Cooled Single Package Indoor Air-Cooled Split System Indoor Air- Cooled Air Reheat Pool Water Air Reheat & Pool Water Air Reheat Pool Water Air Reheat & Pool Water A/C Condenser & Pool Water A/C Condenser Air Reheat Pool Water Air Reheat & Pool Water A/C Condenser & Pool Water A/C Condenser Air Reheat Pool Water Air Reheat & Pool Water A/C Condenser & Pool Water A/C Condenser Note: 1. Air-Enthalpy Method may be used to validate the test when airflow cannot be directly measured. C5.3 Cooling Condensate Measurement. C5.3.1 The latent cooling capacity shall be determined from measurements of the condensate flow rate. The drain connection should be trapped to stabilize condensate flow. C5.3.2 Calculations. C Latent cooling capacity is calculated as follows: q lci = w c C6 C The sensible cooling capacity is then calculated as follows: q sci = q tci q lci C7 15

20 ANSI/AHRI STANDARD where q tc may be substituted for q tci (refrigerant enthalpy method) if capacity is determined using the compressor calibration method. C5.4 Indoor Air-Enthalpy Methods. C5.4.1 Space conditioning capacity is determined by measuring airflow rate, dry-bulb temperature and water vapor content of the air that enters and leaves the coil. Air enthalpies shall be determined in accordance with ANSI/ASHRAE Standard C5.4.2 This method shall be employed for equipment having total cooling capacities of less than 40.0 kw, and may be used for equipment with greater capacities. C5.4.3 Cooling Calculations. C Total, sensible, and latent indoor cooling capacities, based on test data collected according to the indoor air-enthalpy method, shall be calculated using the following equations 1 : ( ) Qmi ha1 ha 2 q tci = vn = Q mi v ' n ( h a 1 h a 2 ) ( 1+ ) W n C8 q = sci ( ) Q mi c pa 1 t a 1 c pa 2 t a v n = ( ) Qmi cpa1 ta1 cpa 2 ta 2 ' vn ( 1+ Wn ) C9 where c pa1 = W 1 C10 and c pa2 = W 2 q lci = Q mi v ' n ( W1 W2 ) ( 1+ ) W n C11 C12 C When the indoor air-enthalpy method is used, the total and sensible cooling capacities shall be adjusted for duct losses. The duct loss adjustment shall be added to the total and sensible cooling capacities. The duct loss adjustment shall be calculated as follows: If using the indoor air-enthalpy test method and the equipment indoor section is located in the indoor test room, then (q loss ) IA = (UA duct ) 2i (t a1 t a2 ) C13 If using the indoor air-enthalpy test method and the equipment indoor section is located in an outdoor test room, then (q loss ) IA = (UA duct ) lo (t ao t a1 ) + (UA duct ) 2o (t ao t a2 ) + (UA duct ) 2i (t a1 t a2 ) C14 C5.4.4 Calculations Net-Air Reheating. C The total heating capacity based on test data collected according to the indoor air-enthalpy method shall be calculated using the following equation: 1 The latent indoor cooling capacity is a function of the latent heat of vaporization (h fg ) of water. In C equations for q lci, the h fg, 2.47 x 10 6 J/kg, corresponding to 14ºC is used.. Also, the energy associated with the leaving condensate is not included because its impact on net capacity is negligible. 16

21 ANSI/AHRI STANDARD q = thi ( ) Q micpa 2 ta 2 ta 1 vn = Qmicpa 2 ta 2 ' vn Wn ( ) ( 1+ ) ta1 C15 where c pa2 is calculated as specified in Section and W n = W 1 = W 2 C16 C When the indoor air-enthalpy method is used, the total heating capacity shall be adjusted for the duct losses. The duct loss adjustment shall be calculated as specified in C and then subtracted algebraically (i.e., subtract q loss if it is positive and add q loss if it is negative) from the heating capacity determined using the indoor or outdoor air-enthalpy method. C5.4.5 Moisture Removal Capacity Calculations. C The total moisture removal capacity based on test data collected according to the indoor air-enthalpy method shall be calculated using the following equation: w cc C5.5 Compressor Calibration Method. ( W W ) 1 2 ( 1+ W ) Q = ( 60) mi v C17 n n C5.5.1 General Description. For the compressor calibration method, total cooling capacity is determined as follows: a. For cases where the superheat of the refrigerant leaving the evaporator is 3 C or higher, capacity shall be evaluated by determining refrigerant flow rate and the change in refrigerant enthalpy between the inlet and outlet of the indoor section or indoor side of the equipment. Refrigerant flow rate shall be deduced based on prior or subsequent calibration of the compressor under identical operating conditions: the same compressor suction and discharged pressures and the same compressor suction temperature. As described in Section 6 of ANSI/ASHRAE Standard 23, compressor calibration may be achieved using either one of the calorimeter methods or one of the flow meter methods. b. For cooling mode tests where the superheat of the refrigerant leaving the evaporator is less than 3 C, cooling capacity shall be determined by conducting a separate evaporator-type calorimeter test where the compressor is operated under the same test conditions as encountered for the equipment test. C5.5.2 Refrigerant Properties Measurement. C With the equipment operating at the desired test conditions, the temperature and pressure of the refrigerant leaving the indoor section or side, entering the expansion device (cooling mode), and entering and leaving the compressor shall be measured. For cases where the indoor air-enthalpy method is also conducted, data used to calculate capacity according to the compressor calibration method and the indoor air-enthalpy method shall be collected over the same intervals. C On equipment not sensitive to refrigerant charge, pressure measuring instruments may be tapped into the refrigerant lines provided that they do not affect the total charge by more than 0.5%. C On equipment sensitive to refrigerant charge, a preliminary test is required prior to connecting any pressure gauges or beginning the first official test. In preparation for this preliminary test, temperature sensors shall be attached to the equipment s indoor and outdoor coils. The sensors shall be located at points that are not affected by vapor superheat or liquid subcooling. After the preliminary test is completed, the refrigerant shall be removed from the equipment, and the needed pressure gauges shall be installed. The equipment shall be evacuated and recharged with refrigerant. The test shall then be repeated. Once steady-state operation is achieved, refrigerant shall be added or 17

22 ANSI/AHRI STANDARD removed until, as compared to the average values from the preliminary test, the following conditions are achieved: 1. Each on-coil temperature sensor indicates a reading that is ±0.6 C 2. Temperatures of the refrigerant entering and leaving the compressor are ±2 C 3. Refrigerant temperature entering the expansion device is ±1.2 C Once these conditions have been achieved over an interval of at least ten minutes, refrigerant charging equipment shall be removed and the first of the official tests shall be initiated. C Refrigerant temperatures shall be measured by means of thermocouples or equivalent devices that are properly attached to the lines at appropriate locations. C No instrumentation shall be removed, replaced, or otherwise disturbed during any portion of a complete capacity test. C Temperatures and pressures of the refrigerant vapor entering and leaving the compressor shall be measured at approximately 250 mm from the compressor shell. If the reversing valve is included in the calibration, these measurements should be taken on the lines to the coils at approximately 250 mm from the reversing valve. C5.5.3 Compressor Flow Rate Calibration. C Refrigerant flow rate shall then be determined based on a separate calibration test conducted on the same compressor as used by the equipment under test. For cases where the superheat of the refrigerant leaving the evaporator is 3ºC or higher, the calibration test shall be conducted using one of the applicable methods specified in ANSI/ASHRAE Standard 23. For cases where the equipment is heating and the refrigerant superheat leaving the evaporator is less than 3ºC, however, the condenser calorimeter method described in ANSI/ASHRAE Standard 41.9 shall be exclusively used to determine refrigerant flow rate. Refrigerant flow rate calibration tests are not applicable for cases where the equipment is cooling and the refrigerant superheat leaving the evaporator is less than 3ºC (C5.5.4). C Calibration tests shall be performed with the compressor and reversing valve (where used) at the same ambient temperature and air pattern as in the tested equipment. C5.5.4 Cooling Capacity Secondary Test for Equipment, When Tested, Having a Suction Superheat Less than 3ºC. C For cooling mode tests where the superheat of the refrigerant leaving any evaporator is less than 3ºC, a separate test using an evaporator-type calorimeter shall be conducted. The three evaporator-type calorimeters that may be used are: 1. Secondary refrigerant calorimeter 2. Secondary fluid calorimeter 3. Primary refrigerant calorimeter The separate calorimeter test shall be conducted as specified in ANSI/ASHRAE Standard 23 and ANSI/ASHRAE Standard For these particular calorimeter tests, adherence to the requirements given in Sections , , , , , and of ANSI/ASHRAE Standard 41.9 shall be waived. C In order to conduct the follow-up calorimeter test, knowledge of the following parameters from the original equipment test are required: the evaporator saturation temperature or pressure and refrigerant temperature leaving the evaporator. The condenser saturation temperature or pressure from the original equipment test should also be recorded. 18

23 ANSI/AHRI STANDARD C Using the results from the evaporator-type calorimeter test, total cooling capacity shall be calculated as specified in C C5.5.5 Compressor Calibration Method Calculations Cooling Capacity When the Equipment Suction Superheat Is 3 C or Higher. C For tests in which the evaporator superheat is 3 C or higher, total cooling capacity shall be calculated as follows: q w tc = r ( ) hr 2 hr1 E i C18 where h r1, h r2, and E i are measured during the equipment test, and w r is determined based on prior or subsequent compressor calibration tests and refrigerant property measurements made during the equipment test. C For tests in which the evaporator superheat is less than 3 C, total cooling capacity shall be calculated as follows: q tc = q e + UAa ta tc E i C19 where E i is measured during the original equipment test while q e, UA a, t a, and t c are all measured during the subsequent evaporator-type calorimeter test described in C C5.5.6 Compressor Calibration Method Calculations Heating Capacity. C Total heating capacity shall be calculated as follows: q = th w h h + E r r1 r 2 i C20 where h r1, h r2, and E i are measured during the equipment test, and w r is determined based on prior or subsequent compressor calibration tests and refrigerant property measurements made during the equipment test. C5.6 Airflow Rate Measurement. C5.6.1 Measurement Methods According to Rated Cooling Capacity. C For equipment having a rated cooling capacity less than 40 kw, the indoor airflow rate shall be measured using the nozzle airflow measuring apparatus described in C3.2 and pictured in Figure C5. The apparatus may also be used to measure the airflow rate through the outdoor coil, which is needed, for example, if using the outdoor air-enthalpy method to provide the secondary capacity measurement. The airflow nozzle(s) that is used shall be selected and applied in accordance with C3.3 and Figure C6. The airflow rate shall be calculated as specified in C Figure 12 of ANSI/ASHRAE Standard 51 should be referred to for guidance on the placement of the static pressure taps and the position of the diffusion baffle (settling means) relative to the chamber inlet. Deviations from the specified test setup shall be allowed only if such deviations are described in ANSI/ASHRAE Standard 51. C For equipment having a rated capacity of 40 kw or higher, the indoor airflow rate may be measured as described in C For cases where a C3.2 nozzle airflow measuring apparatus is not used and capacity is determined using the compressor calibration methods, airflow rate shall be determined indirectly. Indirect determination shall be achieved by using the calculated capacity or by measuring the dry-bulb temperature and water vapor content of the air that enters and leaves the indoor coil, C

24 ANSI/AHRI STANDARD C5.6.2 Calculations Nozzle Airflow Measuring Apparatus. C The airflow rate through a single nozzle is calculated by the following equations: Q = mi CA C21 n ' 2PV vn Where ' v n = vn 1+ W n = v P (1 + W n n nsp ) C22 C When more than one nozzle is used, the total airflow rate is the sum of the flow rates of the individual nozzles calculated in accordance with C C Airflow rate, expressed in terms of Standard Air, shall be calculated as follows: Q s = Qmi Qmi ' 1.204v 1.204v (1 + W ) C5.6.3 Calculations Indirect Determination of Airflow Rate. n = C23 n n C When airflow rate is determined indirectly in accordance with C , the airflow rate shall be evaluated using the following equations: For Cooling: q v tci l Q i = ( h a1 h a2 ) C24 For Heating: q thi 1 Q i = ( h h ) a2 v a1 C25 C6 Test Procedures. C Airflow rate, expressed in terms of standard air (Q s ), shall be calculated as specified in C , where v n and W n shall be evaluated based on the indoor coil entering air property measurements, i.e., assume v n = v 1 and W n = W 1. C6.1 Test Room Requirements. C6.1.1 Either one or two test rooms are required, depending upon the type of equipment to be tested and the manufacturer's installation instructions. C6.1.2 An indoor condition test room is always required. This may be any room or space in which the desired test conditions can be maintained within the prescribed tolerances. It is recommended that air velocities in the vicinity of the equipment under test do not exceed 2.5 m/s. 20 C6.1.3 An outdoor condition test room or space is required for tests of air-cooled equipment and for tests of remote water-cooled equipment. This test room shall be of sufficient volume and shall circulate air in a manner such that it does not change the normal air circulating pattern of the equipment under test. It shall be of dimensions such that the distance from any room surface to any equipment surface from which air is discharged is not less than 2.0 m and the distance from any other room surface to any other equipment surface is not less than 1.0 m, except for floor or wall relationships required for normal equipment installation. The room

25 ANSI/AHRI STANDARD conditioning apparatus should handle air at a rate not less than the outdoor airflow rate and preferably should take this air from the direction of the equipment air discharge and return it at the desired conditions uniformly and at low velocities. C6.2 Equipment Installation. C6.2.1 The equipment to be tested shall be installed in the test room(s) in accordance with the manufacturer's installation instructions. Equipment that is intended to be installed indoors shall be located entirely within the indoor test room; equipment that is intended to be installed outdoors shall be located entirely within the outdoor test room. In all cases, the manufacturer's recommendations with respect to distances from adjacent walls, amount of extensions through walls, etc., shall be followed. C6.2.2 No alterations to the equipment shall be made except for the attachment of required test apparatus and instruments in the prescribed manner. The entire test apparatus shall not have a leakage rate which exceeds 0.01 m 3 /s when a negative pressure of 0.25 kpa is maintained at the apparatus exit air location. C6.2.3 Where necessary, equipment shall be evacuated and charged with the type and amount of refrigerant specified in the manufacturer's published instructions. C6.2.4 Interconnecting tubing shall be as furnished or prescribed by the manufacturer. In the absence of other instructions, 8.0 m of tubing shall be employed, at least 3 m of which is located in the outdoor test room. C6.2.5 If pressure measuring instruments are used, they shall be connected to the equipment only through short lengths of small diameter tubing and shall be located so that the readings are not influenced by fluid head in the tubing. C6.2.6 No change shall be made in fan speed or system resistance to correct for barometric variations. C6.3 Airflow Measurements. C6.3.1 The airflow measuring device shall provide measurements in accordance with the provisions of Section C5.6. C6.4 External Resistance Measurement. C6.4.1 External resistances shall be measured in accordance with the provisions of Section C3.4. Connections to equipment outlets shall comply with the provisions of C3.4. C6.5 Temperature Measurement. C6.5.1 Temperature measurements shall be made in accordance with ANSI/ASHRAE Standard C6.5.2 In-duct, outlet temperature and water vapor content measurements shall be taken at not less than three locations at the centers of equal segments of the cross-sectional area, or suitable sampling or mixing devices giving equivalent results shall be provided. Typical mixing and sampling devices are illustrated in ANSI/ASHRAE Standard Connections to the equipment shall be insulated between the place of measurement and the equipment so that heat leakage through the connections does not exceed 1.0% of the capacity. C6.5.3 Indoor inlet dry-bulb temperature and water vapor content measurement shall be taken at not less than three positions equally spaced over the equipment inlet area, or equivalent sampling means provided. For units without an inlet duct connection or enclosure, the dry-bulb temperature and water vapor content measuring instruments or sampling devices should be located approximately 150 mm from the equipment inlet opening or openings. C6.5.4 Wet-bulb measurements shall be corrected in accordance with ANSI/ASHRAE Standard C6.6 Test Procedure-Cooling, Dehumidifying and Pool Water Heating Capacity Test. 21

26 ANSI/AHRI STANDARD C6.6.1 The test room reconditioning apparatus and the equipment under test shall be operated until steadystate performance that is consistent with the test tolerances specified in Table C2 is attained before cooling capacity test data are recorded. C6.6.2 Data used in evaluating cooling capacity shall then be recorded at equal intervals that span 5 minutes or less until readings over a period of one-half hour are within the tolerances prescribed in C7.2. C7 Data to Be Recorded. C7.1 Table C2 shows the data to be recorded during a test. Items indicated by an x under the test method columns, or their equivalent, are required when that test method is employed. C7.2 Test Tolerances. C7.2.1 All test observations shall be within the tolerances specified in Table C3, as appropriate to the test methods, type of equipment, and type of test. C7.2.2 The maximum permissible variation of any observation during the capacity test is listed under Test Operating Tolerances in Table C3. This represents the greatest permissible difference between maximum and minimum instrument observations during the test. When expressed as a percentage, the maximum allowable variation is the specified percentage of the arithmetical average of the observations. C7.2.3 The maximum permissible variations of the average of the test observations from the standard or desired test conditions are shown in Table C3 under Test Condition Tolerance. C7.2.4 Variations greater than those prescribed shall invalidate the test. 22

27 ANSI/AHRI STANDARD Item Table C2 Data To Be Recorded Units Condensate Measurement Method Air-Enthalpy Method Compressor Calibration Method SI Date Observer Barometric pressure kpa Equipment nameplate data Times h Power input to equipment W Applied voltage V Frequency Hz External resistance to airflow kpa Fan speed, if adjustable rev/s Dry-bulb temperature of air entering equipment ºC Wet-bulb temperature of air entering equipment ºC Dry-bulb temperature of air leaving equipment ºC Wet-bulb temperature of air leaving equipment ºC Throat diameter of nozzle mm Velocity pressure at nozzle throat or static pressure kpa difference across nozzle Temperature at nozzle throat ºC Absolute pressure at nozzle throat kpa Temperature of pool water entering equipment ºC Temperature of pool water leaving equipment ºC Pool water flow rate through equipment L/s Temperature of water entering water cooled condenser ºC Pressure drop across water cooled condenser kpa Condensing pressure or temperature kpa/ºc Evaporator pressure or temperature kpa/ºc Temperature of low pressure siderefrigerant vapor entering ºC switchover valve Temperature of refrigerant vapor entering compressor ºC 23

28 ANSI/AHRI STANDARD Table C2 (continued) Data To Be Recorded Item Units Condensate Compressor Air-Enthalpy Measurement Calibration Method SI Method Method Temperature of refrigerant vapor leaving compressor ºC Temperature of high pressure side refrigerant vapor leaving ºC switchover valve Refrigerant or surface temperature used for leakage coefficient ºC determination Rate of condensate collection kg/h Refrigerant liquid temperature, indoor side ºC Refrigerant liquid temperature, outdoor side ºC Note 1 Refrigerant vapor temperature, indoor side ºC Refrigerant vapor temperature, outdoor side ºC Note 1 Refrigerant vapor pressure, indoor side kpa Additional data Note 2 Notes: 1 Required only during cooling capacity test. 2 Required only for line loss adjustment. 24

29 ANSI/AHRI STANDARD Outdoor dry-bulb, C: entering leaving Indoor dry-bulb, C: Readings Table C3 - Test Tolerances Test Operating Tolerances (Total Observed Range) Cooling, Dehumidifying and Pool Water Heating Test Condition Tolerance Cooling, Dehumidifying and Pool Water Heating entering leaving Indoor wet-bulb, C: entering leaving Condenser cooling water temperatures, C Saturated refrigerant suction temperatures, C Liquid temperatures not otherwise specified, C External resistance to airflow, kpa Electrical voltage, % Fluid flow rate, % Nozzle pressure drops, % of reading Condensate measurement % C8 Test Results. C8.1 Capacity Test Requirements. C8.1.1 The results of a capacity test shall express quantitatively the effects produced upon air by the equipment tested. For given test conditions, the capacity test results shall include each of the following quantities that are applicable to cooling, dehumidifying or pool water heating and to the type of equipment tested: a. Moisture removal rate (condensate), kg/h b. Total power input to equipment or power inputs to all equipment components, W c. Net cooling capacity, W d. Net reheat capacity, W e. Pool water heating capacity, W f. Indoor side airflow rate, m 3 /h g. External resistance to indoor airflow, kpa C8.1.2 The test results shall be considered valid when the moisture removal capacity of the two simultaneously conducted methods of test agree within 5%. The test results obtained from the air enthalpy method shall be the basis for rating the equipment. C8.1.3 Test results from the condensate measurement method (C5.3) shall be used to determine capacities without adjustment for permissible variations in test conditions except as specified for deviations from standard barometric pressure. C8.1.4 Air-enthalpies shall be corrected for deviations from saturation temperature and standard barometric pressure. 25

30 ANSI/AHRI STANDARD C8.1.5 When the compressor calibration method is employed, 'simultaneously conducted' shall be construed to mean obtaining the operating conditions for the compressor calibration test. C8.2 Calculations of Results. C8.2.1 Moisture Removal Capacity shall be determined by the pounds of moisture collected by the condensate measurement method (primary test method). C8.2.2 Moisture Removal Efficiency shall be calculated by taking the Moisture Removal Capacity found in C8.2.1 divided by the total input power. C9 Letter Symbols Used in Equations. C9.1 Symbols used in this appendix are as follows: A n = nozzle area, m 2 C = nozzle coefficient of discharge, dimensionless c pa1 = specific heat of air entering the indoor side,j/(kg da C) c pa2 = specific heat of air leaving the indoor side, J/(Kg da C) c w = heat capacity of water, J/kg C D = nozzle throat diameter, mm E i = power input, indoor side, W h a1 = enthalpy, air entering indoor side, J/kg da h a2 = enthalpy, air leaving indoor side, J/kg da h r1 = enthalpy, refrigerant entering indoor side, J/kg h r2 = enthalpy, refrigerant leaving indoor side, J/kg P n = pressure at nozzle throat, kpa P v = velocity pressure at nozzle throat or static pressure difference across nozzle, kpa Q i = airflow, indoor, calculated, m 3 /h Q mi = airflow, indoor, measure, m 3 /h Q s = airflow, standard air, m 3 /h q e = heat input to calorimeter evaporator, W q lci = latent cooling capacity, indoor side data, W q cw = condenser water-side capacity, W q pw = pool water heating capacity, W q sci = sensible cooling capacity, indoor side data, W q tc = total cooling capacity, compressor data, W q tci = total cooling capacity, indoor side data, W q th = total heating capacity, compressor data, W q thi = total heating capacity, indoor side data, W (q loss ) IA = duct loss correction for the indoor air-enthalpy method, W Re = Reynolds number, dimensionless t a = temperature, ambient air, dry-bulb, C t ao = temperature, air temperature within the outdoor test room, dry-bulb, C t a1 = temperature, air entering indoor side, dry-bulb, C t a2 = temperature, air leaving indoor side, dry-bulb, C t c = temperature, surface, calorimeter condenser, C t w = temperature, water entering outdoor side, C t w3 = temperature, water entering outdoor side, C t w4 = temperature, water leaving outdoor side, C t w5 = temperature, pool water entering equipment, C t w6 = temperature, pool water leaving equipment, C UA a = product of the overall condenser-to-air heat transfer coefficient and the outside surface area of the condenser, as determined from the separate evaporator-type calorimeter test method (C5.5.4), W/ C (UA duct ) 1o = product of the overall heat transfer coefficient and surface area for the indoor coil inlet duct that is located in the outdoor test room, W/ C 26

31 ANSI/AHRI STANDARD (UA duct ) 2i = product of the overall heat transfer coefficient and surface area for the indoor coil outlet duct that is located in the indoor test room, W/ C (UA duct ) 2o = product of the overall heat transfer coefficient and surface area for the indoor coil outlet duct that is located in the outdoor test room, W/ C V a = velocity of air, at nozzle, m/s v n = specific volume of dry air portion of the mixture evaluated at the dry-bulb temperature and barometric pressure at the nozzle exit, and the vapor content evaluated at the leaving conditions, m 3 /kg da v n = specific volume of air at nozzle, m 3 /kg of air-water-vapor mixture. v nsp = specific volume of the dry air portion of the mixture evaluated at the dry-bulb temperature at the nozzle exit and the vapor content evaluated at the leaving conditions, but at standard barometric pressure, m 3 /kg da v 1 = specific volume of dry air portion of the mixture entering the indoor coil by measuring the dry-bulb temperature and water vapor content of the air, m 3 /kg da W 1 = humidity ratio, air entering indoor side, kg wv /kg da W 2 = humidity ratio, air leaving indoor side, kg wv /kg da W n = humidity ratio at the nozzle, kg wv /kg da w c = mass flow rate, indoor coil condensate, kg/s w cc = calculated moisture removal capacity, kgm wv /s w cw = calculated condenser water-side capacity, kgm wv /s w pw = flow rate, pool water, kg/s w r = mass flow rate, refrigerant, kg/s μ = dynamic air viscosity, kg/m s Subscripts: da = dry air wv = water vapor C10 Reference Properties and Data. C10.1 Thermodynamic Properties of Air. C The thermodynamic properties of air-water vapor mixture shall be obtained from the equations in the Psychrometric chapter in ASHRAE Handbook, Fundamentals. C10.2 Thermodynamic Properties of Water and Steam. C The thermodynamic properties of water and steam shall be obtained from the ASHRAE Handbook, Fundamentals. C10.3 Thermodynamic Properties of Volatile Refrigerants. C The thermodynamic properties of volatile refrigerants may be obtained from the ASHRAE Handbook, Fundamentals or from an established refrigerant property database. 27

32 ANSI/AHRI STANDARD Airflow Measuring Apparatus Airflow Airflow Airflow 28

33 ANSI/AHRI STANDARD

34 ANSI/AHRI STANDARD

35 ANSI/AHRI STANDARD Airflow Measuring Apparatus Airflow Measuring Apparatus Airflow Airflow Airflow Airflow Airflow Airflow 31

36 ANSI/AHRI STANDARD Airflow FIGURE C5 AIRFLOW MEASURING APPARATUS 32

37 ANSI/AHRI STANDARD FIGURE C6 AIRFLOW MEASURING NOZZLE 33

38 ANSI/AHRI STANDARD AIRFLOW Figure C7a External Static Pressure Measurement (Up Flow) 34 s

39 ANSI/AHRI STANDARD Figure C7b External Static Pressure Measurement (Horizontal Flow) Figure C7c External Static Pressure Measurement (Down Flow) 35