Abstract
The application techniques of fluid mixtures are recently developed for improving the thermodynamic performance of Rankine cycles. In the power plants, for instance, the better thermal efficiency can be attained with the aid of the Kalina cycle if water is replaced by a mixture of ammonia and water. In case of the refrigerators and heat pumps, the Lorenz cycle is suggested with the use of mixtures of refrigerants for obtaining the better coefficient of performance. In this point of view, the behaviors of vapor liquid equilibria are discussed in conjunction with the Kalina cycle and the Lorenz cycle.
