Accession Number : ADA267215


Title :   Nucleate Pool Boiling Characteristics Of R-124


Descriptive Note : Master's thesis,


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Bertsch, George M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a267215.pdf


Report Date : Mar 1993


Pagination or Media Count : 159


Abstract : This thesis examines the pool boiling heat transfer characteristics of HCFC-124 (R-124) and HCFC-124/oil mixtures with up to 10% (by weight) miscible alkylbenzene oil. One smooth and 4 enhanced tubes were tested: a 19 and 26 low integral-fin tube (GEWA-K); a modified finned tube (TURBO-B); and a porous coated tube (HIGH FLUX). The tests were carried out using the procedure used for CFC-114 at the same saturation temperature of 2.2 deg C. This allowed for direct comparison of the pool boiling heat transfer characteristics between the two refrigerants. The smooth and GEWA-K 19 fin per inch tube performance in pure HCFC-124 and HCFC-124/oil mixtures ranged between 10 to 50% better than in pure CFC-114 and CFC-114/oil mixtures for all heat fluxes. The HIGH FLUX and TURBO-B tubes were similar in performance. With pure HCFC-124, the finned tubes typically provided enhancements in the heat transfer coefficient between 2 and 3 times that of a smooth tube. The HIGH FLUX and TURBO-B surfaces typically provided additional enhancements 2 times that of the finned tubes. With the addition of oil, the heat transfer increased from the smooth and finned tubes but decreased from the HIGH FLUX and TURBO-B tubes. The HIGH FLUX and TURBO-B tubes therefore exhibited enhancements less than the finned tubes at high oil concentrations and high heat fluxes.


Descriptors :   *HEAT TRANSFER , *REFRIGERANTS , *NUCLEATE BOILING , TEST AND EVALUATION , TEMPERATURE , BENZENE , THERMODYNAMICS , INTEGRALS , THESES , MIXTURES , BOILING , HEAT TRANSFER COEFFICIENTS , TUBES , ALKYL RADICALS , POROUS MATERIALS , SATURATION , SURFACES , COATINGS , TRANSFER , OILS , HEAT FLUX , FINS


Subject Categories : Organic Chemistry
      Air Condition, Heating, Lighting & Ventilating
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE