本文首先介绍了一种有机朗肯循环(ORC)的工质筛选过程,即针对工质的环保特性、循环热效率及净输出功等选出了14种综合性能较好的工质.然后,针对所选工质,采用模拟退火算法对基本有机朗肯循环(BORC)和内回热有机朗肯循环(ORCIH)性能进行了优化计算,对比了两种循环在最佳工况下的热力学性能,并分析了变热源温度对BORC热力学性能的影响.结果显示,对于各所选工质,ORCIH的热效率与`效率相对于BORC分别提高了0.80％～3.34％和3.20％～10.22％,而BORC热效率、工质质量流量和循环净输出功均随着热源温度的升高而增大.在所选非制冷工质中benzene循环性能最好,制冷工质中R245ca与R245fa综合性能最好.
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