Energetic and exergetic analysis of CO2- and R32-based transcritical Rankine cycles for low-grade heat conversion

被引：128

作者：

Chen, Huijuan ^{[1
]}

Goswami, D. Yogi ^{[1
]}

Rahman, Muhammad M. ^{[1
]}

Stefanakos, Elias K. ^{[1
]}

机构：

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

来源：

APPLIED ENERGY | 2011年 / 88卷 / 08期

关键词：

Transcritical Rankine cycle; Low-grade heat conversion; Working fluid; SUPERCRITICAL CARBON-DIOXIDE; THERMODYNAMIC CYCLE; WORKING FLUIDS; SOLAR-ENERGY; TRIPLE-POINT; POWER; TEMPERATURE; PERFORMANCE; PRESSURES; EQUATION;

D O I：

10.1016/j.apenergy.2011.01.029

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Transcritical Rankine cycles using refrigerant R32 (CH2F2) and carbon dioxide (CO2) as the working fluids are studied for the conversion of low-grade heat into mechanical power. Compared to CO2, R32 has higher thermal conductivity and condenses easily. The energy and exergy analyses of the cycle with these two fluids shows that the R32-based transcritical Rankine cycle can achieve 12.6-18.7% higher thermal efficiency and works at much lower pressures. An analysis of the exergy destruction and losses as well as the exergy efficiency optimization of the transcritical Rankine cycle is conducted. Based on the analysis, an "ideal" working fluid for the transcritical Rankine cycle is conceived, and ideas are proposed to design working fluids that can approach the properties of an "ideal" working fluid. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：2802 / 2808

页数：7

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