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AN EXPERIMENTAL COMPARISON OF EVAPORATION AND CONDENSATION HEAT TRANSFER COEFFICIENTS FOR HFC-134A AND CFC-12.

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

Summary

HEAT TRANSFER COEFFICIENTS WERE MEASURED IN A HORIZONTAL, SMOOTH TUBE. THE REFRIGERANT IN THE TEST TUBE WAS HEATED OR COOLED BY USING WATER FLOWING THROUGH AN ANNULUS SURROUNDING THE TUBE. EVAPORATION TESTS WERE PERFORMED FOR A TEMPERATURE RANGE OF 278 TO 288 K (5 TO 15 DEG C) WITH INLET AND EXIT QUALITIES OF 10 AND 90%, RESPECTIVELY. FOR CONDENSATION TESTS, THE TEMPERATURE RANGED FROM 303 TO 323 K (30 TO 50 DEG C), WITH INLET AND EXIT QUALITIES OF 90 AND 10%, RESPECTIVELY. FOR SIMIL AR MASS FLUXES, HEAT TRANSFER COEFFICIENTS FOR R134A WERE SIGNIFICANTLY HIGHER THAN THOSE OF R12. COMPARING R134A AND R12 IN REFRIGERATION CYCLES SHOWS THAT R134A HAS A LOWER MASS FLOW RATE BECAUSE THE ENTHALPY OF VAPORIZATION IS HIGHER.

Details

  • Original title: AN EXPERIMENTAL COMPARISON OF EVAPORATION AND CONDENSATION HEAT TRANSFER COEFFICIENTS FOR HFC-134A AND CFC-12.
  • Record ID : 1991-1069
  • 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.
    215-224; 5 fig.; 2 tabl.; 12 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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