Transport Property Measurements of HFC-236ea
Final rept. Oct 92-Mar 95
IOWA STATE UNIV AMES DEPT OF MECHANICAL ENGINEERING
Pagination or Media Count:
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 refrigerantlubricant 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.
- Organic Chemistry
- Air Pollution and Control