非共沸混合冷媒を用いた蒸気圧縮式空調システムの性能分析

（階層的解法に基づくサイクルシミュレーション）

抄録

Refrigerants for vapor-compression type air conditioning system have been shifted from hydrofluorocarbon ones to alternative ones with low global warming impacts. Hydrofluoroolefin refrigerants, which contribute to a low global warming potential, are generally used by mixing with other conventional refrigerants and exhibit non-isothermal condensation and evaporation processes. The present study develops a steady-state cycle simulation model of vaporcompression type air conditioning systems using zeotropic refrigerant mixtures. To consider non-isothermal processes, heat exchangers are modeled in a distributed approach. Moreover, a hierarchical solution method, in which the cycle simulation model is decomposed into a cycle model considering a connection condition, control condition, boundary condition, and refrigerant charge condition and submodels expressing performance characteristics of components, is developed to improve computational efficiency of large-scale simulation models. The developed model is applied to performance analysis of a vapor-compression type air conditioning system using the refrigerant mixture R32/R1234ze(E).