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本文针对跨临界有机朗肯循环进行了热力计算,并根据工质的热物性与环保性能以及对应循环的热力学性能等因素,经过一系列筛选过程最终优选出了10种综合性能较好的跨临界有机朗肯循环工质。热力计算结果表明,部分有机工质对应的跨临界朗肯循环的效率随膨胀机进口温度或蒸发压力的变化存在最优值。基于此,本文进一步采用粒子群算法(Particle Swarm Optimization,PSO)对所选有机工质的跨临界朗肯循环性能进行了优化分析。优化结果表明,在所筛选的10种跨临界有机朗肯循环工质中非制冷剂工质propylene的综合性能最好,propane次之;而制冷剂工质中R143a的综合性能较好。
In this paper, the thermodynamic calculation of transcritical organic Rankine cycle is carried out. Based on the thermophysical and environmental properties of the working fluid and the thermodynamic properties of the corresponding cycle, a series of screening processes finally selected 10 kinds of comprehensive performance better transcritical Organic Rankine cycle refrigerant. The results of thermodynamic calculation show that the efficiency of the transcritical Rankine cycle corresponding to some organic working medium has the optimal value with the change of the inlet temperature or the evaporation pressure of the expander. Based on this, we further use the Particle Swarm Optimization (PSO) to optimize the transcritical Rankine cycle performance of selected organic working fluid. The results of optimization show that propane is the second best for the non-refrigerant refrigerant propylene in the selected 10 kinds of transcritical organic Rankine cycle refrigerants, and the comprehensive performance of R143a in refrigerant refrigerants is better.