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Compression heat pump using a water-ethanol mixture as working fluid: cycle characteristics based on chart analysis.

[In Japanese. / En japonais.]

Author(s) : ENDO N., YABE A., YAMASHITA I.

Type of article: Article

Summary

The working temperature level was set below 100 °C. In the low temperature region the pressure of the suction gas is low, and the influence of mechanical loss of the compressor on coefficient of performance (COP) will be large. The relation between COPs and mechanical loss of the compressor has been made clear on the ethanol mol fraction range (0 to 1). A water-ethanol mixture cycle can increase COP and lower the working temperature compared with a water cycle. Another effect of adding ethanol is decreasing the irreversible loss at the heat exchanger level. As the water-ethanol mixture is a non-azeotropic mixture, temperature changes in two-phase regions. This characteristic is valid when a secondary coolant is used.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 2002-2064
  • Languages: Japanese
  • Source: Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 18 - n. 3
  • Publication date: 2001
  • Document available for consultation in the library of the IIR headquarters only.

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