Thermodynamic Estimation Method of Ternary Refrigerant Mixtures Using New Mixing Rules
Abstract
Binary and ternary refrigerant mixtures are attracting attentions in view of the energy saving and the ozone problem. This paper proposes modified mixing rules of two-constant (a,b) cubic equation of state for ternary mixtures. The addition of the ternary interaction parameter c123 to the mixing rule, occurring in conjunction with the parameter b,was examined in the calculation of thermodynamic properties in comparison with common mixing rules. The validity of new mixing rules was evaluated by using literary vapor-liquid equilibrium date of ternary refrigerant mixtures i. e. R14-R23-R13,R13B1-R12-R152a,R22-R12-R114,R290-R22-R115 and R12-R152a-R113. It was found that the ternary interaction parameter C123 contributes to the accuracy of the vapor pressure and is almost equal irrespective to the measured temperature. The three-dimensional representation system of the phase diagram of ternary refrigerant mixtures was also developed in order to decide compositions of alternative mixtures.
- Publication:
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Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers
- Pub Date:
- 2011
- Bibcode:
- 2011TRACE...8..195Y
- Keywords:
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- Estimation method;
- Ternary refrigerant mixture;
- Mixing rule;
- Interaction parameter;
- Vapor-liquid equilibrium;
- Phase diagram