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TRANSPORT PROPERTY MEASUREMENTS OF HFC-236EA
Citation:
Lin, J. Y. AND M. B. Pate. TRANSPORT PROPERTY MEASUREMENTS OF HFC-236EA. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-98/037 (NTIS PB98-137185), 1998.
Impact/Purpose:
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Description:
The report gives results of an evaluation of transport properties of 1,1,1,2,3,3,-hexafluoropropane (HFC-236ea), with liquid viscosity and thermal conductivity being the two main transport properties of interest. In addition, the specific heat and density of refrigerant/lubricant mixtures are also provided in this study. NOTE: HFC-236ea is currently a candidate to replace 1,2-dichloro-tetrafluoroethane--CFC-114--in surface craft and submarine chiller units). The study used a novel method for simultaneously measuring viscosity and thermal conductivity, using inline property sensors in series with a heat transfer measurement system. Specifically, viscosity was measured with an inline torsional oscillation viscometer, and thermal conductivity was measured from the knowledge of single-phase heat transfer characteristics of a heated test section. The viscosity and thermal conductivity measurements for CFC-114 were compared with ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) data: agreement was within +/-5% for thermal conductivity and +/-2% for viscosity. For HFC-236ea, the measured data were compared with REFPROP, a theoretical prediction package developed by the NIST (National Institute of Standards and Technology): average deviations were within +15% in thermal conductivity, and -5% in viscosity.