COEXISTING DENSITIES AND VAPOR-PRESSURES OF REFRIGERANT-R-22, REFRIGERANT-R-134A, AND REFRIGERANT-R-124 AT 300-395-K

The results of the investigation are presented in two parts. Part I, g iven in this paper, presents the experimentally measured coexisting de nsities and vapor pressures for the refrigerants R-22 (chlorodifluorom ethane), R-134a (1,1,1,2-tetrafluoroethane), and R-124 (1-chloro-1,2,2 ,2-tetrafluoroethane) from 300 K to near their respective critical poi nts. In addition, compressed liquid and supercritical densities were m easured for R-22 and compared to literature values. The compressed R-2 2 densities agreed within experimental error with those of Kohlen et a l. (Kohlen, R., Kratzke, H. and Muller, S., 1985. Thermodynamic proper ties of saturated and compressed liquid difluorochloromethane. J. Chem . Thermodyn., 17: 1141-1151). Considerable discrepancies were found in the literature for R-134a and R-124 coexisting densities and vapor pr essures. For both R-134a and the R-124, at least one set of data from the literature agreed with our results. The analysis of the measuremen ts to determine critical densities which are internally consistent wit h our experimental measurements is presented as Part II (Van Poolen, L .J., Niesen, V.G., Holcomb, C.D. and Outcalt, S.L., 1994. Critical den sities from coexisting density data: application to refrigerants R-22, R-134a, and R-124. Fluid Phase Equilibria, in press) in a separate pa per.