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一、引言 余热的动力回收,常用非水工质的朗肯循环。国外有关设计这种循环的报道可见。从这些报道看,一般是限定余热流体初温,对若干工质进行经典的工况比较计算来确定工质和设计参数,局限性较大。国内的有关文献提出了在某些特殊条件下选择工质和参数的方法。对大量可供选择的工质,因缺乏h-s图这类资料,不得不用估算法进行试选工质,试算工况的复杂性给这方面的研究带来困难。为此本文导出了直接计算(火用)效率的计算式,以简化估计(火用)效率、选择工质、优化设计参数过程。
First, the introduction of waste heat recovery, commonly used non-aqueous qualifying Rankine cycle. Foreign reports on the design of this cycle can be seen. From these reports, it is generally limited to the initial temperature of the waste heat fluid, and some working conditions are compared to calculate the working conditions and design parameters. The domestic literature put forward some special conditions in the selection of working fluid and parameters of the method. For a large number of available working fluids, due to the lack of information such as the h-s map, they have to use the estimation method to conduct the test run. The complexity of the trial working conditions has brought difficulties in this respect. For this reason, this paper derives the calculation formula of direct calculation (exergy) efficiency to simplify the estimation (exergy) efficiency, select the working fluid and optimize the design parameter process.