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FILM COEFFICIENTS FOR IN-TUBE EVAPORATION OF AMMONIA AND R502 WITH AND WITHOUT SMALL PERCENTAGES OF MINERAL OIL.

Author(s) : CHADDOCK J., BUZZARD G.

Summary

REFRIGERANTS ARE CLASSIFIED AS COMPLETELY MISCIBLE, PARTIALLY MISCIBLE OR IMMISCIBLE WITH MINERAL OILS. LOCAL HEAT TRANSFER COEFFICIENTS WERE DETERMINED IN A SIX-PASS HORIZONTAL SERPENTINE COIL DURING EVAPORATION OF R502 AND AMMONIA TESTS WERE PERFORMED OIL-FREE AND WITH 1 TO 10% OIL CONCEN THE R502 EXPERIMENTS WERE AT 247 K (-26 DEG C) WHERE MINERAL OIL IS PARTIALLY MISCIBLE. AT 2 TO 10% OIL CONCENTRATION THE HEAT TRANSFER COEFFICIENT IS REDUCED BY 30 TO 50% BELOW THAT OF OIL-FREE R502. AT 1% OR LESS THE RC MONA XPE. THE OIL WAS IMMISCIBLE AND FORMED A TAR-LIKE SLUDGE THAT COLLECTED ALONG THE BOTTOM OF THE TUBE. THE HEAT TRANSFER COEFFICIENT IS REDUCED BY 50 TO 90% BELOW THAT OF OIL-FREE AMMONIA.

Details

  • Original title: FILM COEFFICIENTS FOR IN-TUBE EVAPORATION OF AMMONIA AND R502 WITH AND WITHOUT SMALL PERCENTAGES OF MINERAL OIL.
  • Record ID : 1987-0452
  • Languages: English
  • Publication date: 1986
  • Source: Source: ASHRAE Trans.
    vol. 92; n. 1A; 22-40; 12 fig.; 4 tabl.; 11 ref.; discuss.
  • Document available for consultation in the library of the IIR headquarters only.

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