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EVAPORATION AND CONDENSATION HEAT TRANSFER AND PRESSURE DROP IN HORIZONTAL, 12.7-MM MICROFIN TUBES WITH R22.

Author(s) : SCHLAGER L. M., PATE M. B., BERGLES A. E.

Type of article: Article

Summary

THE TUBES, REFERRED TO AS MICROFIN TUBES, HAD A 11.7-MM MAXIMUM INSIDE DIAMETER, 60 OR 70 FINS WITH HEIGHTS RANGING FROM 0.15 TO 0.30 MM, AND SPIRAL ANGLES FROM 15 TO 25 DEG. A SMOOTH TUBE WAS ALSO TESTED. NOMINAL EVAPORATION CONDITIONS WERE 273 TO 278 K (0 TO 5 DEG C), 0.5 TO 0.6 MEGAPASCAL, WITH INLET AND OUTLET QUALITIES OF 15 AND 85%, RESPECTIVELY ; CONDENSATION CONDITIONS WERE 312 TO 315 K (39 TO 42 DEG C), 1.5 TO 1.6 MEGAPASCAL, WITH INLET AND OUTLET QUALITIES OF 85 AND 10%, RESPECTIVELY. THE AVERAGE HEAT TRANSFER COEFFICIENTS IN THE MICROFIN TUBES WERE 1.6 TO 2. 2 TIMES LARGER FOR EVAPORATION AND 1.5 TO 2.0 TIMES LARGER FOR CONDENSATION THAN THOSE IN THE SMOOTH TUBE.

Details

  • Original title: EVAPORATION AND CONDENSATION HEAT TRANSFER AND PRESSURE DROP IN HORIZONTAL, 12.7-MM MICROFIN TUBES WITH R22.
  • Record ID : 1991-2066
  • Languages: English
  • Source: J. Heat Transf. - vol. 112 - n. 4
  • Publication date: 1990
  • Document available for consultation in the library of the IIR headquarters only.

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