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中文摘要：
汽车发动机余热资源品位高、回收潜力大,适合使用有机朗肯循环（Organic Rankine Cycle,ORC）进行回收利用。本文中针对内燃机余热有机朗肯循环的特点提出工质筛选条件,并根据实际系统的性能和成本分析,提出以总净功量、热效率和膨胀机的膨胀比与尺寸参数等为评价指标的系统评价方法,对筛选出的备选工质进行评价。结果表明,工质的表现主要与临界温度和分子复杂度有关,ORC系统的性能与工质的临界温度呈正相关,系统成本则与工质的分子复杂度呈正相关。因此,临界温度较高而分子复杂度偏低的工质R1233zd（E）是7种备选工质中的最佳选择。
英文摘要：
The waste heat of automotive engine is a high quality resource with high potential of energy re-covery, so is suitable for energy recovery by using organic Rankine cycle （ ORC） . In this paper, based on the fea-tures of ORC for the waste heat of internal combustion engine, the conditions for working fluid selection are pro-posed, and according to the performance and cost analyses of real system, a system evaluation scheme is put forward with the total net work done, thermal efficiency and the volumetric flow ratio and size parameter of expander as eval-uation indicators to evaluate candidate working fluids. The results show that the behavior of working fluids mainly re-lated with critical temperature and molecular complexity. The performance of ORC system is positively correlated to the critical temperature of working fluid while the cost of system is positively correlated to the molecular complexity of working fluid. As a result, the working fluid R1233zd（ E） with a higher critical temperature and a relatively lower molecular complexity is the best choice among seven working fluid candidates.
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