Development of High Efficiency Carbon Dioxide Commercial Heat Pump Water Heater

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Although heat pump water heaters are today widely accepted in both Japan and Europe, where energy costs are high and government incentives for their use exist, acceptance of such products in the US has been limited. While this trend is slowly changing with the introduction of heat pump water heaters into the residential market, but acceptance remains low in the commercial sector. The objective of the presented work is the development of a high efficiency R744 heat pump water heater for commercial applications with effective utilization of the cooling capability for air conditioning and/or refrigeration. The ultimate goal is to ... continued below

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Petersen, Michael; Bowers, Chad D.; Elbel, Stefan & Hrnjak, Pega July 1, 2012.

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Description

Although heat pump water heaters are today widely accepted in both Japan and Europe, where energy costs are high and government incentives for their use exist, acceptance of such products in the US has been limited. While this trend is slowly changing with the introduction of heat pump water heaters into the residential market, but acceptance remains low in the commercial sector. The objective of the presented work is the development of a high efficiency R744 heat pump water heater for commercial applications with effective utilization of the cooling capability for air conditioning and/or refrigeration. The ultimate goal is to achieve total system COP of up to 8. This unit will be targeted at commercial use where some cooling load is typically needed year round, such as restaurants, hotels, nursing homes, and hospitals. This paper presents the performance results from the development of four R744 commercial heat pump water heater packages of approximately 35 kW and comparison to a commercially available baseline R134a unit of the same capacity and footprint. In addition, the influences of an internal heat exchanger and an enhanced evaporator on the system performance are described and recommendations are made for further improvements of the R744 system.

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  • International Refrigeration and Air Conditioning Conference at Purdue, July 16-19, 2012

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  • Report No.: DOE/EE0003981-2
  • Grant Number: EE0003981
  • Office of Scientific & Technical Information Report Number: 1063976
  • Archival Resource Key: ark:/67531/metadc831808

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • July 1, 2012

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • July 22, 2016, 7:44 p.m.

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Petersen, Michael; Bowers, Chad D.; Elbel, Stefan & Hrnjak, Pega. Development of High Efficiency Carbon Dioxide Commercial Heat Pump Water Heater, article, July 1, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc831808/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.