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Residential gas absorption heat pump water heater prototype performance test results.

Number: pap. n. 52

Author(s) : GARRABRANT M., STOUT R., GLANVILLE P., et al.

Summary

Water heating accounts for approximately 13% of residential energy use in the U.S. Approximately half of the residential water heaters sold in the U.S. and Canada are natural gas fired, predominantly minimum efficiency storage tank models with Energy Factors (EF) ranging from 0.59 to 0.62. Higher efficiency and higher cost options serve about 15% of the market, but still have EFs below 1.0, ranging from 0.65 to 0.95. To develop a new class of residential gas water heating products capable of providing EFs greater than 1.0, a gasfired ammonia-water absorption heat pump was designed, as an integrated unit wherein the heat pump is installed on top of a storage tank. Cycle modeling and breadboard testing were followed by the fabrication of three demonstration prototypes, each capable of fully automatic operation. The 6,300 Btu/hr (1.85 kW) input prototypes feature ultra-low NOx burners, condensing combustion and a direct-acting solution pump. Heat pump cycle performance (COP), predicted and measured, over a range of stored water temperatures and ambients is presented, along with energy use and cost comparisons to current residential water heating technologies. Parameters impacting system control as the storage tank is heated at a variety of ambient temperatures are discussed.

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Pages: 10 p.

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Details

  • Original title: Residential gas absorption heat pump water heater prototype performance test results.
  • Record ID : 30014341
  • Languages: English
  • Source: International sorption heat pump conference (ISHPC2014), College Park, United States, March 31-April 2, 2014.
  • Publication date: 2014/03/02

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