非共沸混合作動流体を用いたオーガニックランキンサイクルの熱力学的サイクルシミュレーション

Abstract

The study performed cycle simulation of organic Rankine cycles with zeotropic mixtures as working fluid. A conventional Rankine cycle was modeled and thermodynamic state changes of each process was solved with the aid of Engineering Equation Solver. Thermophysical properties of working fluids were taken from REFPROP. The net thermal efficiency was calculated under the conditions of the driving heat source temperatures of 50 degree C and 90 degree C, and the heat sink temperature of 30 degree C. The results showd that the zeotropic mixtures achieved higher net thermal efficiency under the driving heat source temperature of 50 degree C. When the driving heat source temperature was raised to 90 degree C, pure materials with large latent heat resulted in higher net thermal efficiencies.