Performance Analysis of ORC System for Non-Zeotropic Mixtures Under Different Solar Energy Sources

Yujiong GU; Limin CHEN; Zhi GENG

doi:10.12096/j.2096-4528.pgt.2018.028

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Performance Analysis of ORC System for Non-Zeotropic Mixtures Under Different Solar Energy Sources

New And Renewable Energy | 更新时间：2025-07-04

- Performance Analysis of ORC System for Non-Zeotropic Mixtures Under Different Solar Energy Sources
- Power Generation Technology Vol. 39, Issue 2, Pages: 177-187(2018)
- 作者机构：
  
  华北电力大学国家火力发电工程技术研究中心, 北京市昌平区 102206
- 作者简介：
- 基金信息：
  
  Beijing Natural Science Foundation(3172031);Fundamental Research Funds for the Central Universities(2016XS24);Fundamental Research Funds for the Central Universities(2017MS017)
- DOI：10.12096/j.2096-4528.pgt.2018.028
  CLC：
- Received：10 December 2017，
  
  Published：28 April 2018
- 稿件说明：
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Yujiong GU, Limin CHEN, Zhi GENG. Performance Analysis of ORC System for Non-Zeotropic Mixtures Under Different Solar Energy Sources[J]. Power Generation Technology, 2018, 39(2): 177-187.
DOI：

Yujiong GU, Limin CHEN, Zhi GENG. Performance Analysis of ORC System for Non-Zeotropic Mixtures Under Different Solar Energy Sources[J]. Power Generation Technology, 2018, 39(2): 177-187. DOI： 10.12096/j.2096-4528.pgt.2018.028.

摘要

工质性质是影响有机朗肯循环(organic Rankine cycle，ORC)系统性能的重要因素之一。在不同热源温度下，对采用R601、R245fa作为组分的9种不同质量配比工质的ORC系统热力性和经济性进行计算，然后采用灰色关联法对系统性能进行分析及综合评价，并与纯工质的性能进行对比。研究表明，混合工质系统的热力学指标与温度滑移大小近似成反比。当温度滑移大于5K时，纯工质性能更优，且经济性也优于混合工质系统。综合来看，热源温度一定时，灰色关联度随着蒸发温度的升高呈现先增大后减小的趋势；混合工质R601/R245fa(0.1/0.9)的温度滑移最小，其性能也最优。采用R601和R245fa混合作为工质的系统在热源温度为160℃时，灰色关联度最大，系统性能更优。

Abstract

The characteristic of working fluids is one of the important factors that affect organic Rankine cycle (ORC) system.Under the different heat source temperature

11 substances were adopted as the subcritical ORC working fluids

R245fa and R601

as well as 9 non-zeotropic binary mixtures in different mass ratios.The thermal and economic model of the ORC had carried on the analysis.Finally

the method of grey correlation was used to evaluate the system performance.The study shows that the thermodynamic indexes of non-zeotropic binary mixtures are approximately inverse proportional to the temperature glides.When the temperature slip is greater than 5℃

the pure industrial performance is better.The system using the non-zeotropic mixtures is less economical than the pure working fluids.Incombination

when the heat source temperature is fixed

the grey correlation grade increases first and then decreases with the increase of evaporation temperature.The temperature glide of R601/R245fa(0.1/0.9) is the best and its performance is optimal.Using mixed R601 and R245fa as working fluid

system performance is best when the heat source temperature is 160℃.

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