Working fluids for high-temperature organic Rankine cycles
Working fluids for high-temperature organic Rankine cycles
复制标题
DOI：
10.1016/j.energy.2010.10.051
复制
发表时间：
2011-01-01
期刊：
影响因子：
9
通讯作者：
Fischer, Johann
中科院分区：
文献类型：
--
作者：
Ngoc Anh Lai;Wendland, Martin;Fischer, Johann
烷烃、芳烃和直链硅氧烷被认为是高温有机朗肯循环(ORCS)的工质。使用基于分子的状态方程Back-One和PC-SAFT进行了案例研究。首先，研究了在亚临界或超临界最高压力下，最高温度为250摄氏度和300摄氏度的“孤立”ORC过程。在内部热回收的情况下，所有物质的平均热效率Eta(Th)约为卡诺效率的70%，并且随着临界温度的升高而增加。其次，我们对外部热交换器(EHE)从热载体到ORC工质的热传递进行了夹点分析。问题是1兆瓦净功率输出所需的热载体的最小热容流速。对于热载体，入口温度考虑为280摄氏度和350摄氏度。根据ORC的热效率和热载体的热容量、流量以及体积和热流量进行的排名显示，环戊烷是所有研究案例的最佳工质。(C)2010爱思唯尔有限公司。保留所有权利。
Alkanes, aromates and linear siloxanes are considered as working fluids for high-temperature organic Rankine cycles (ORCs). Case studies are performed using the molecular based equations of state BACK-ONE and PC-SAFT. First, "isolated" ORC processes with maximum temperatures of 250 degrees C and 300 degrees C are studied at sub- or supercritical maximum pressures. With internal heat recovery, the thermal efficiencies eta(th) averaged over all substances amount to about 70% of the Carnot efficiency and increase with the critical temperature. Second, we include a pinch analysis for the heat transfer from the heat carrier to the ORC working fluid by an external heat exchanger (EHE). The question is for the least heat capacity flow rates of the heat carrier required for 1 MW net power output. For the heat carrier inlet temperatures of 280 degrees C and 350 degrees C are considered. Rankings based on the thermal efficiency of the ORC and on the heat capacity flow rates of the heat carrier as well as on the volume and the heat flow rates show cyclopentane to be the best working fluid for all cases studied. (C) 2010 Elsevier Ltd. All rights reserved.