4008 -- Spray Evaporation Heat Transfer Performance of R123 in Tube Bundles PDF

Focuses on evaluating the heat transfer performance of refrigerant R123 in the spray evaporation environment for pure refrigerant and for the case of lubricant addition. Tests were conducted with triangular-pitch tube bundles made from enhanced boiling tubes, enhanced condensation tubes, and plain-surface tubes. A second enhanced boiling surface bundle, made with a square-pitch tube alignment, was also tested so a comparison could be made between the square- and triangular-pitch geometries. In addition to pure refrigerant work, experiments were performed with small concentrations of a 305 SUS naphthenic mineral oil to evaluate its effect on falling-film heat transfer performance. Two different refrigerant supply rates were used in this work so the effects of film-feed supply rate could be interpreted from the data. Presents the results obtained from the testing.

KEYWORDS: year 1996, heat flow, refrigerants, R123, performance, testing, chillers, evaporators, lubricants, heat transfer coefficient, comparing, heat exchangers