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Heat transfer enhancement techniques for alternative refrigerants and their mixtures. Recent progress in "super heat pump" project.

Author(s) : YABE A.

Summary

The 9-year "Super heat pump energy accumulation systems" project, one of Japan's largest national energy conservation projects, is described. In it, the Lorenz cycle with non-azeotropic mixtures of HCFC and HFC was successfully realized for the first time for large-scale heat pumps. Several new enhancement techniques of phase-change heat transfer for non-azeotropic mixtures were researched and developed, such as counterflow plate-fin-type compact heat exchangers, shell-and-tube heat exchangers with relatively small cross sections and EHD (electro-hydrodynamic) heat exchangers. As for the EHD evaporator for non-azeotropic mixtures of R123 and R134a, about 3 times the evaporation heat-transfer coefficients were achieved by applying high potential electric fields for the wide range of quality.

Details

  • Original title: Heat transfer enhancement techniques for alternative refrigerants and their mixtures. Recent progress in "super heat pump" project.
  • Record ID : 1995-0507
  • Languages: English
  • Source: Proceedings of international seminar on heat transfer, thermophysical properties and cycle performance of alternative refrigerants.
  • Publication date: 1993/12/06
  • Document available for consultation in the library of the IIR headquarters only.

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