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HEAT TRANSFER COEFFICIENT. TWO-PHASE FLOW BOILING OF HFC134A.

Author(s) : HAMBRAEUS K.

Summary

EVAPORATION OF R134A INSIDE SMOOTH, HORIZONTAL TUBES IS STUDIED WITH PURE REFRIGERANT AND WITH OIL-REFRIGERANT MIXTURES. HEAT FLUX HAS VARIED FROM 2 TO 10 KILOWATTS/M2. OILCONTENT IS VARIED FROM 0 TO 2.5 MASS PERCENTAGE (SYNTHETIC OIL, EXP-0275). OIL FREE R134A IS FOUND TO HAVE HIGHER HEAT TRANSFER COEFFICIENT THAN R22. AT 2 AND 4 KILOWATTS/M2, THE HEAT TRANSFER COEFFICIENT HAS A MAXIMUM VALUE FOR AN OIL CONTENT OF AROUND 0.5 MASS PERCENTAGE. NO INCREASE AT ALL IS REGISTERED FOR 6 KILOWATTS/M2. HEAT TRANSFER COEFFICIENTS FOR PURE REFRIGERANT ARE ALSO COMPARED TO EXISTING CORRELATIONS. PIERRE'S CORRELATION PREDICTS VALUES WITH A REASONABLE ACCURACY. THE BY JUNG MODIFIED CHEN-RELATION OVERESTIMATES THE HEAT TRANSFER COEFFICIENT.

Details

  • Original title: HEAT TRANSFER COEFFICIENT. TWO-PHASE FLOW BOILING OF HFC134A.
  • Record ID : 1991-1064
  • 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.
    205-214; 10 fig.; 8 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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