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High Pressure Vapor-Liquid Equilibria for the HFC125-HFC152a System

Nishiumi H Akita H Akiyama S

Korean Journal of Chemical Engineering, September 1997, 14(5), 359-364(6), 10.1007/BF02707052

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Abstract

We measured vapor-liquid equilibria (VLE) for the system of pentafluoroethane (HFC12)-difluoroethane (HFC152a) over the temperature range from 268.15 K to 373.15 K. Fitting VLE data obtained to an extended BWR equation of state, binary interaction parameters were correlated as a linear function of temperature. Applying the equation of state including the binary interaction parameters to refrigeration cycle, estimation of coefficient of performance (COP) revealed about 13.3% energy-saving against chlorodifluoromethane (HCFC22), when the mole fraction of HFC125 is 0.44. As the condition of COP estimation, we assumed that temperature changes of out-side fluids were from 285.15 down to 280.15 K and 305.15 up to 310.15 K with 3 K in minimum temperature difference, respectively.

Keywords

Fluorocarbon HFC125 HFC152a VLE Equation of State BWR Equation of State Binary Interaction Parameter Refrigeration Coefficient of Performance COP

References

Nishiumi H, Komatsu M, Yokoyama T, Kohmatsu S, Fluid Phase Equilib., 83, 109 (1993)
Nishiumi H, J. Chem. Eng. Jpn., 16, 449 (1984)