Abstract
This report presents results from an ASHRAE-sponsored research project designated RP-1067. The objective of this study was to document the heat transfer and pressure drop phenomena of selected refrigerants in a superheated state with lubricant mixtures. Refrigerants used in this study included R-22, R-134a, R-407C, and R-410A. This paper presents the smooth tube results over a Reynolds number range of 100,000 to 1,000,000, with lubricant concentrations ranging from 0% to 5% by mass. The refrigerant saturation temperature was maintained at 40°C, which would be common for the inlet of a condenser. The results show that even small additions of lubricant cause significant increases in pressure drop. The lubricant also causes a less dramatic increase in the heat transfer coefficients. Models are proposed to allow prediction of superheated refrigerant and lubricant mixture performance.
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