According to the heat collection characteristics of parabolic trough solar collector,R600 and R245fa are selected as circulating working fluids.The thermo-economic models of basic organic Rankine cycle(BORC)and the ORC system with internal heat exchanger(IHE-ORC)are established with the exergy efficiency and levelized energy cost(LEC)as objectives,respectively.Bi-objective optimization is conducted using the non-dominated sorting genetic algorithm.The optimal thermo-economic performance of two systems with two working fluids are obtained using TOPSIS with entropy weight method integrated.The variations of thermo-economic performance of the systems with evaporation pressure,superheat degree and condensation temperature are analyzed.The results show that,under optimization and decision making,when R245fa is used,IHE-ORC system has clear advantage in thermodynamic performance with the optimal exergy efficiency and LEC of 54.11%and 0.1548 $/kWh,respectively.When R600 is used,BORC system exhibits better economic performance with the optimal exergy efficiency and LEC of 49.89%and 0.1318 $/kWh,respectively.Within the variation range of operating parameters,the exergy efficiency and LEC of IHE-ORC system are always higher than those of BORC,and much higher exergy efficiency is obtained when using R245fa,while much lower LEC is achieved when using R600.
关键词
太阳能/朗肯循环/遗传算法/槽式太阳能集器/热力性/经济性
Key words
solar energy/Rankine cycle/genetic algorithms/parabolic trough solar collecor/thermodynamics/economy
维普
万方数据