Abstract：To explore the best mixing working fluid of the two-stage evaporation series organic Rankine cycle system under specific working conditions, three groups of mixing working fluids with different characteristics of R21/R113, R1234ze/R141b and R227ea/R245fa were selected. According to thermodynamic performance, economic index and environmental index, the non-dominated sorting genetic algorithm was used for the multi-objective optimization. By solving Pareto boundary, three decision methods were used to select the optimal solution for each working fluid group. The optimal decision method was selected according to the offset. The results show that when the heat source temperature is 150 ℃ with the cold source temperature of 15 ℃, the exergy efficiency of the optimal solution of the mixing working fluid of R1234ze/R141b is relatively high with relatively low levelized cost of energy(LCOE)and equivalent carbon emission(ECE), and the heat source temperature is also suitable, which illuminates that R1234ze/R141b is relatively suitable mixing working fluid in this working condition.
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2024, Vol. 45 
