447 R143a, R32+R125, R125+R143a, R600, R600aの熱力学状態式の開発(冷媒物性およびヒートポンプ,環境保全型エネルギー技術)

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  • 447 Development of Thermodynamic Equations of State for R143a, R32+R125, R125+R143a, R600, and R600a

説明

Reliable Helmholtz thermodynamic equations of state for important refrigerants, R143a, R32+R125, R125+R143a, R600, and R600a, are developed. The blended mixture of R32+R125 is used in air-conditioning systems as R410A, and R600a (iso-butane) is a refrigerant in domestic refrigerators. Those equations of state are developed as our final results from long experience of developing thermodynamic equations. The characteristics are that those equations can derive reliable specific heat values near saturation in the gaseous phase by using virial coefficients based on theoretical model of intermolecular force, and the thermodynamic surface covering all the fluid phase behaves reasonably from viewpoint of physics. It was confirmed by examining the ideal curves especially at high temperature and pressure phase. Those equations will provide the best property values for those substances. This report introduces several features of those equations of state.

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