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AN EXPERIMENT ON A VAPOR COMPRESSION HEAT PUMP SYSTEM USING NONAZEOTROPIC MIXTURES.

Author(s) : TAKAMATSU H., et al.

Summary

EXPERIMENTS ARE CARRIED OUT ON A VAPOR COMPRESSION HEAT PUMP SYSTEM USING R22/R114 MIXTURES AS THE WORKING FLUID. DOUBLE PIPE HEAT EXCHANGERS, IN WHICH THE REFRIGERANT FLOWS INSIDE THE INNER TUBE AND WATER FLOWS COUNTERCURRENTLY IN THE OUTER ANNULUS, ARE USED FOR THE CONDENSER AND EVAPORATOR. TWO KINDS OF INNER TUBES, IE A SMOOTH TUBE AND AN INTERNALLY GROOVED TUBE, ARE TESTED. THE EFFECT OF VARIOUS PARAMETERS SUCH AS THE MIXTURE COMPOSITION, THE TEMPERATURE OF THE SOURCE AND SINK WATER AND THE SUPERHEATING OF THE REFRIGERANT AT THE EXIT OF THE EVAPORATOR, ON THE COP, ARE CLARIFIED. A TRIAL CALCULATION BASED ON THE EXPERIMENTAL RESULTS SHOWS THAT THE COP OF THE MIXTURE BECOMES LARGER THAN THAT OF THE PURE REFRIGERANT, IN THE CASE OF A LARGE CHANGE IN WATER TEMPERATURE, ONLY IF THE HEAT TRANSFER SURFACE AREA IS LARGE ENOUGH AND THE SUPERHEATING OF THE REFRIGERANT IS QUITE SMALL AT THE EXIT OF THE EVAPORATOR.

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Pages: 592-596

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Details

  • Original title: AN EXPERIMENT ON A VAPOR COMPRESSION HEAT PUMP SYSTEM USING NONAZEOTROPIC MIXTURES.
  • Record ID : 1992-2428
  • Languages: English
  • Source: New challenges in refrigeration. Proceedings of the XVIIIth International Congress of Refrigeration, August 10-17, 1991, Montreal, Quebec, Canada.
  • Publication date: 1991/08/10
  • Document available for consultation in the library of the IIR headquarters only.

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