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GENERAL METHOD FOR THE EVALUATION OF COMPLEX HEAT PUMP CYCLES.

Author(s) : INVERNIZZI C., ANGELINO G.

Type of article: Article, IJR article

Summary

WHENEVER THE FRACTIONAL TEMPERATURE LIFT OF A HEATPUMP IS HIGHER THAN 0.15, SIMPLE CYCLES EXHIBIT UNSATISFACTORY ENERGY PERFORMANCE. MULTI-STAGE THROTTLING, BOTH IN NON-REGENERATIVE AND REGENERATIVE CYCLES IMPROVES THE COP. THE PERFORMANCE OF THESE COMPLEX CYCLES IS FOUND TO BE A FUNCTION OF THE MOLECULAR COMPLEXITY OF THE REFRIGERANT, THE EVAPORATION TEMPERATURE, THE TEMPERATURE LIFT AND THE NUMBER OF STAGES OF THROTTLING. THESE CYCLES ARE SHOWN TO BE EQUIVALENT TO A COMBINATION OF SIMPLE CYCLES AND FOR A GIVEN FRACTIONAL TEMPERATURE LIFT AN OPTIMUM MOLECULAR COMPLEXITY (BETWEEN THAT O 1-T)IS. FLUIDS WITH SIMPLER MOLECULES EXHIBIT EXCESSIVE VAPOUR SUPERHEATING DURING COMPRESSION, AND THOSE WITH MORE COMPLEX MOLECULES HAVE EXCESSIVE THROTTLING LOSSES.

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Format PDF

Pages: 31-40

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Details

  • Original title: GENERAL METHOD FOR THE EVALUATION OF COMPLEX HEAT PUMP CYCLES.
  • Record ID : 1991-0373
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 13 - n. 1
  • Publication date: 1990

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