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COP improvement by transfer of the superheating into the internal heat exchanger.

Author(s) : TAMBOVTSEV A., QUACK H.

Summary

It is well known that the power consumption of refrigerators is reduced by about 2-3%, when the evaporation temperature is increased by 1 K. It is proposed to obtain such an increase in the evaporation temperature by a combination of an internal heat exchanger in combination with a thermostatic expansion valve. With this combination it is possible to realize a slightly wet outlet of the low pressure stream out of the evaporator and to transfer the final evaporation and the superheating into the internal heat exchanger. To facilitate a stable control behaviour it is proposed to operate the internal heat exchanger in the co-current mode. The result of this arrangement is a power saving in the 5 to 10% range and a similar increase of the volumetric refrigeration rate. A further increase is possible, if the surface area of the evaporator is increased. This arrangement is advantageous for all refrigerants, even for ammonia, where normally internal heat exchangers are detrimental.

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Pages: ICR07-B2-1406

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Details

  • Original title: COP improvement by transfer of the superheating into the internal heat exchanger.
  • Record ID : 2008-0607
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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