You are here:
HEAT TRANSFER EVALUATION OF HFC-236EA AND CFC-114 IN CONDENSATION AND EVAPORATION
Huebsch, W. AND M. Pate. HEAT TRANSFER EVALUATION OF HFC-236EA AND CFC-114 IN CONDENSATION AND EVAPORATION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-96/070 (NTIS PB96-183900), 1996.
The report gives results of a heat transfer evaluation of the refrigerants hexafluoropropane (HFC-236ea) and 1,1,2,2-dichloro-tetrafluoroethane (CFC-114). (NOTE: With the mandatory phase-out of chlorofluorocarbons (CFCs), as dictated by the Montreal Protocol and Clean Air Act Amendments, it is imperative for the Navy to find a replacement for CFC-114 that is environmentally safe and possess similar performance characteristics. Currently, one of the leading candidates to replace CFC-114 is HFC-236ea.) This research focuses on comparing the refrigerants not only in condensation and pool boiling, but also with various tube surfaces. The test facility used in this study was initially used for spray evaporation testing; however, it was redesigned and modified for use with condensation, pool boiling, or spray evaporation testing. During condensation, the rig was capable of producing saturated or superheated vapor. During pool boiling or spray evaporation, the test facility was capable of testing pure refrigerants or refrigerant/lubricant mixtures. The test facility is described in detail in the full report. The two refrigerants produced similar performance characteristics in condensing vapor on integral-fin tubes, so that the transition to HFC-236ea should be accomplished without major modifications to existing condensers.