Nucleate Pool Boiling Characteristics Of R-124
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1993
- Accession Number
- ADA267215
Entities
People
- George M. Bertsch
Organizations
- Naval Postgraduate School