Performance enhancement comparison of a gas turbine combined cycle system by introducing a refrigeration cycle using environment-friendly refrigerants to recover waste heat

As the attention for energy conservation and environment protection increases, how to enhance the recovery of waste heat becomes a severe problem. This paper proposes a novel cycle configuration for waste heat recovery by introducing an ejector refrigeration cycle (ERC) to combined gas turbine (GT) and Kalina cycle (KC). The analysis results show that when refrigerant of ERC is R290, the total energy efficiency reaches its maximum value of 53.02%, while R600a leads to more system net power output than R290 and R1234ze.