A supercritical Rankine cycle using zeotropic mixture working fluids for the conversion of low-grade heat into power
A supercritical Rankine cycle using zeotropic mixture working fluids for the conversion of low-grade heat into power
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DOI：
10.1016/j.energy.2010.10.006
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发表时间：
2011-01-01
期刊：
影响因子：
9
通讯作者：
Stefanakos, Elias K.
中科院分区：
文献类型：
--
作者：
Chen, Huijuan;Goswami, D. Yogi;Stefanakos, Elias K.
本文提出并分析了一种利用非共沸混合工质的超临界朗肯循环，用于将低品位热能转化为电能。与传统的有机朗肯循环不同，超临界朗肯循环在加热过程中不经过两相区。通过采用非共沸混合物作为工质，冷凝过程也是非等温进行的。这两个特点都有可能减少不可逆性并提高系统效率。对有机朗肯循环和所提出的超临界朗肯循环进行的比较研究表明，在所提出的循环高温为393K - 473K的情况下，其热效率可达10.8% - 13.4%，而有机朗肯循环的热效率为9.7% - 10.1%，相比有机朗肯循环提高了10% - 30%。当将加热和冷凝过程纳入系统时，所提出的超临界朗肯循环的系统㶲效率为38.6%，而有机朗肯循环为24.1%。（C）2010爱思唯尔有限公司。保留所有权利。
A supercritical Rankine cycle using zeotropic mixture working fluids for the conversion of low-grade heat into power is proposed and analyzed in this paper. Unlike a conventional organic Rankine cycle, a supercritical Rankine cycle does not go through the two-phase region during the heating process. By adopting zeotropic mixtures as the working fluids, the condensation process also happens non-isothermally. Both of these features create a potential for reducing the irreversibilities and improving the system efficiency. A comparative study between an organic Rankine cycle and the proposed supercritical Rankine cycle shows that the proposed cycle can achieve thermal efficiencies of 10.8-13.4% with the cycle high temperature of 393 K-473 K as compared to 9.7-10.1% for the organic Rankine cycle, which is an improvement of 10-30% over the organic Rankine cycle. When including the heating and condensation processes in the system, the system exergy efficiency is 38.6% for the proposed supercritical Rankine cycle as compared to 24.1% for the organic Rankine cycle. (C) 2010 Elsevier Ltd. All rights reserved.