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EVAPORATION AND CONDENSATION HEAT TRANSFER COEFFICIENTS FOR A HCFC-124/HCFC-22/HFC-152A BLEND AND CFC-12.

Author(s) : ECKELS S. J., PATE M. B.

Summary

EXPERIMENTAL HEAT TRANSFER COEFFICIENTS ARE REPORTED FOR A TERNARY REFRIGERANT BLEND COMPOSED OF 40% R124, 36% R22, AND 24% R152A. THIS BLEND IS A POSSIBLE SUBSTITUTE FOR R12 IN VAPOUR COMPRESSION REFRIGERATION CYCLES. THE HEAT TRANSFER COEFFICIENTS WERE DETERMINED IN A HORIZONTAL SMOOTH TUBE. FOR THE BLEND THEY WERE FOUND TO BE 12 TO 25% HIGHER FOR EVAPORATION AND 12 TO 30% HIGHER FOR CONDENSATION WHEN COMPARED AT SIMILAR MASS FLUXES. COMPARING A REFRIGERATION CYCLE FOR THE BLEND AND ONE FOR R12 THAT SUPPLY SIMILAR COOLING CAPACITIES SHOWS THAT THE BLEND HAS A LOWER FLOW RATE IN THE EVAPORATOR AND CONDENSER BECAUSE THE ENTHALPY OF VAPORIZATION IS HIGHER. AT A SIMILAR COOLING CAPACITY IN AN EVAPORATOR, THE RATIO OF THE BLEND TO R12 HEAT TRANSFER COEFFICIENTS IS 0.88 TO 1.0, WHILE AT A SIMILAR HEATING CAPACITY IN A CONDENSER THE RATIO IS 0.98 TO 1.05.

Details

  • Original title: EVAPORATION AND CONDENSATION HEAT TRANSFER COEFFICIENTS FOR A HCFC-124/HCFC-22/HFC-152A BLEND AND CFC-12.
  • Record ID : 1991-1070
  • Languages: English
  • Publication date: 1990/07/17
  • Source: Source: USNC-IIR/Proc. 1990 Refrig. Conf., Purdue Univ./ASHRAE, Purdue CFC Conf./Purdue Univ., Ray W. Herrick Lab., Sch. mech. Eng.
    234-241; 5 fig.; 2 tabl.; 12 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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