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COMPARISON OF CFC-114 AND HFC-236EA PERFORMANCE IN SHIPBOARD VAPOR COMPRESSION SYSTEMS
Citation:
Ray, D., M. Pate, AND H. Shapiro. COMPARISON OF CFC-114 AND HFC-236EA PERFORMANCE IN SHIPBOARD VAPOR COMPRESSION SYSTEMS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-97/058 (NTIS PB97-178735), 1997.
Impact/Purpose:
information
Description:
The report gives results of a comparison of the performance of two refrigerants - 1,1,1,2,3,3-hexafluoropropane (HFC-236ea) and 1,2-dichloro-tetrafluoroethane (CFC-114) - in shipboard vapor compression refrigeration systems. (NOTE: In compliance with the Montreal Protocol and Department of Defense directives, alternatives to CFC-114 are being investigated by the U. S. Navy and the U.S. EPA for use in shipboard chillers. HFC-236ea has emerged as a candidate for drop-in replacement.) A computer model was developed for comparing the two refrigerants in a simulated 440-kW centrifugal chiller system. Equations for modeling each system component were developed and solved using the Newton-Raphson method for multiple equations and unknowns. Correlations were developed for CFC-114 and HFC-236ea boiling and condensing coefficients taken at the Iowa State Heat Transfer Test Facility. The model was tested with data provided by the Naval Surface Warfare Center (NSWC) in Annapolis, MD. The experimental data provided by the NSWC sufficiently validate the model, and the simulation model predicts that HFC-236ea would perform favorably as a drop-in substitute for CFC-114. Several recommendations are discussed which may further improve the performance of HFC-236ea in Navy chillers.