ASHRAE Standard 206-2013 Method of Testing for Rating of Multi-Purpose Heat Pumps for Residential Space Conditioning and Water Heating Wayne Reedy Oak Ridge National Laboratory
BACKGROUND Development of standard was supported by ORNL as part of the U.S. Department of Energy s effort to facilitate market penetration of multifunction heat pumps. In order to achieve an instantly recognizable, authoritative document, a test standard was requested of ASHRAE, which in turn established a Standard Project Committee to develop Standard 206 2 Presentation name
SCOPE 206 applies to electrically powered unitary heat pump equipment that provides both space conditioning and water heating functions, and may include other functions, such as dehumidification and/or ventilation. 3 Presentation name
SCOPE 206 addresses air-source, watersource, ground water-source, groundsource closed loop, and direct geoexchange equipment. It applies to air-source equipment rated below 65,000 Btu/h [19,000 W], and water-source, ground water-source, ground-source closed loop, and direct geoexchange equipment rated below 135,000 Btu/h [40,000 W]. 4 Presentation name
SCOPE 206 addresses single-capacity, dualcapacity, and variable-capacity equipment Provides for up to 7 modes of equipment operation o Space conditioning only o Dedicated water heating o Dehumidification+space conditioning o Dehumidification o Space conditioning+water heating o Dehumidification+space conditioning+water heating o Dehumidification+water heating 5 Presentation name
SCOPE Space conditioning may be heating or cooling Dehumidification may be during summer or winter Dedicated water heating may be during summer or winter, with the heat source being either indoor or outdoor 6 Presentation name
SCOPE Test procedure covers packaged, split, minisplit, and triple split equipment configurations Refrigerant-to-water HX may be internal or external to a heat pump section or water storage tank Specifies refrigerant and water line lengths/configuration for all options 7 Presentation name
STANDARD 206 IS AN EXTENSION OF AND CONSISTENT WITH: ANSI/ASHRAE Standard 37 Methods of Testing for Rating Electrically Driven Unitary Air- Conditioning and Heat Pump Equipment (Steady-State Performance) ANSI/ASHRAE Standard 116 Methods of Testing for Rating Seasonal Efficiency of Unitary Air Conditioners and Heat Pumps 8 Presentation name
STANDARD 206 IS ALSO CONSISTENT WITH: AHRI Standard 210/240 Standard for Unitary Air-Conditioning and Air-Source Heat Pump Equipment ANSI/AHRI/ASHRAE ISO Standard 13256-1 Water-source heat pumps - testing and rating for performance - Part 1: Water-to-air and brine-to-air heat pumps AHRI Standard 870 Standard for Performance Rating of Direct GeoExchange Heat Pumps ANSI/ASHRAE Standard 118.2 Method of Testing for Rating Residential Water Heaters 9 Presentation name
STANDARD 206 SHOULD REPLACE: ANSI/ASHRAE Standard 137 Methods of Testing for Efficiency of Space-Conditioning/Water- Heating Appliances that Include a Desuperheater Water Heater and various waivers from DOE s Central Air Conditioner and Central Air Conditioning Heat Pump Test Procedure 10 Presentation name
SPC 206 INCLUDED REPRESENTATION FROM ALL INDUSTRY SEGMENTS Committee was made up of 15 voting members, representing manufactures, testing laboratories, electric utilities, and a university; AHRI was a non-voting member. 11 Presentation name
EQUIPMENT TESTS Space conditioning only Space conditioning + water heating (compressor operates continuously by demand for space conditioning) Water heating only (compressor operates on demand for water heating) 12 Presentation name
WATER HEATING TEST Preconditioning 1) Heat pump operating continuously in space conditioning mode 2) Condition with minimum 41.6 Liter (11 gallon) draw to initiate water heating 3) Heat pump and/or resistive operation to conclusion of water heating 13 Presentation name
WATER HEATING TEST 4) t=0, draw 20.4 Liters (5.4 gallons) 5) Heat pump and resistive operate on internal controls 6) t=68 minutes, draw 60.9 Liters (16.1 gallons) 14 Presentation name
WATER HEATING TEST 7) Heat pump and resistive operate on internal controls 8) t=118 minutes, draw 40.5 Liters (10.7 gallons) 9) Heat pump and resistive operate on internal controls to conclusion of water heating 15 Presentation name
CALCULATION PROCEDURE IS A BIN PROCESS BASED ON: Water heating load Space latent load Space sensible load 16 Presentation name
SPACE SENSIBLE LOAD 206 space cooling design load follows Standard 116 in setting the total space cooling load for 10% oversizing relative to actual unit total capacity at 95 F test point 206 then applies a 0.76 sensible heat factor to determine the space design sensible cooling load 17 Presentation name
SPACE LATENT LOAD The latent cooling load for the combined appliance in Standard 206 is made up of an internal latent gain and a ventilation latent gain. 18 Presentation name
WATER HEATING LOAD The water heating load is assumed evenly distributed over the hours of the year. The hot water usage is taken as 243.4 liters/day (64.3 gallons/day) from ASHRAE 118.2-2006 4, which is the test standard for standalone residential water heaters. Using inlet and outlet water temperatures from ASHRAE 118.2-2006 4 of 14.2 C (58 F) and 57.2 C (135 F) respectively and a water heater energy factor of 0.90 yields an hourly water heating load of 496.9 W (1696 Btu/h). 19 Presentation name
PERFORMANCE DESCRIPTORS Three performance descriptors are used to completely describe the performance of the combined appliance: o Combined appliance space conditioning performance for the cooling season; o Combined appliance space conditioning performance for the heating season; o Combined appliance water heating performance on an annual basis. In all cases, the descriptor ends in a subscript ca to designate combined appliance. 20 Presentation name
PERFORMANCE DESCRIPTORS Air-source equipment o SEER ca o HSPF ca o EF wca Water-source equipment o EER ca o COP ca o EF wca 21 Presentation name
STATUS: Approved as an ASHRAE standard 6/26/2013 Available from ASHRAE in paper or electronic form Includes an excel spreadsheet to perform calculations 22 Presentation name
QUESTIONS COMMENTS 23 Presentation name