A supercritical Rankine cycle using zeotropic mixture working fluids for the conversion of low-grade heat into power

被引：251

作者：

Chen, Huijuan ^{[1
]}

Goswami, D. Yogi ^{[1
]}

Rahman, Muhammad M. ^{[1
]}

Stefanakos, Elias K. ^{[1
]}

机构：

[1] Univ S Florida, Coll Engn, Clean Energy Res Ctr, Tampa, FL 33620 USA

来源：

ENERGY | 2011年 / 36卷 / 01期

关键词：

Supercritical Rankine cycle; Zeotropic mixture; Organic Rankine cycle; Low-grade heat; REVERSE-OSMOSIS DESALINATION; ENERGY RECOVERY-SYSTEMS; WASTE HEAT; CARBON-DIOXIDE; SOLAR-ENERGY; GENERATION; ORC; FEASIBILITY; INDUSTRY;

D O I：

10.1016/j.energy.2010.10.006

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

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.

引用

页码：549 / 555

页数：7

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