Economic performances optimization of an organic Rankine cycle system with lower global warming potential working fluids in geothermal application

摘要: Abstract The aim of this study is to investigate the economic optimization for an ORC system utilizing geothermal energy. An parameter net power output index, which ratio total cost, proposed optimize using zero ODP and lower GWP working fluids. maximum index obtained corresponding optimal pinch point temperature differences heat exchangers are also evaluated system. Furthermore, analyses operating temperatures pressures on performances carried out. effects turbine inlet their discussed. results show that R600 performs most satisfactorily followed by R600a, R1233zd, R1234yf, R1234ze, R290 under performance optimization. Moreover, in evaporator vary more significantly than those condenser evaluations. operated with R600, R1233zd would have reductions proportion equipment purchased cost from large small attributed pressures.