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Recent developments in heat pump technology for water heating.

Author(s) : KALLU R. D. S., CLELAND D. J., WHITE S. D.

Type of article: Article

Summary

The New Zealand food industry has a high use of both water and refrigeration. Passive heat recovery using desuperheaters and use of heat pumps are two options that can be used to integrate the provision of both water heating and cooling requirements. However, conventional technology for both options is limited in terms of the temperatures that can be achieved and/or the fraction of the heat that can be recovered at high temperatures. While the ammonia system fulfils the hot water needs for some sites, many sites require hot water in greater quantities at higher temperatures. A prototype of a novel system using CO2 in a transcritical heat pump cycle was developed. Predictions and performance testing indicate that the prototype can provide about 80 kW of refrigeration at temperatures lower than 0 °C and about 120 kW of water heating to above 90 °C with a combined COP between 5 and 6. The high operating pressure and heat transfer characteristics of CO2 allow a more compact design so the system capital cost is expected to be comparable to conventional refrigeration systems for the same duty.

Details

  • Original title: Recent developments in heat pump technology for water heating.
  • Record ID : 2001-0516
  • Languages: English
  • Source: IRHACE J. - vol. 11 - n. 7
  • Publication date: 1999/11
  • Document available for consultation in the library of the IIR headquarters only.

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