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The development of a heat pump water heater system with a carbon dioxide hermetic scroll compressor.

[In Japanese. / En japonais.]

Author(s) : MORIGAMI K., WATANABE Y.

Type of article: Article

Summary

Carbon dioxide as a working fluid is used for residential heat pump water heaters, because it has little negative environmental impact and excellent characteristics for heating. A very efficient heat exchanger (gas cooler) was developed by adopting a concentric triple tube (inner double tube for refrigerant and outer single tube for water), and also available is a high performance scroll compressor with high efficiency and high reliability without an accumulator, by optimization of the oil injection rate. As a result, a new heat pump water heater with a COP of 4.20 at normal conditions and operating sound levels of 38 dB, which is one of the most efficient and silent systems in the industry, was developed.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 2005-0120
  • Languages: Japanese
  • Source: Refrigeration - vol. 79 - n. 917
  • Publication date: 2004

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