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research-article

A combined organic Rankine cycle (ORC) with double-modes used for IC engine waste heat recovery

[+] Author and Article Information
Guohui Zhu

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
zhugh1219@126.com

Jingping Liu

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
liujp0426@163.com

Jianqin Fu

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, ChinaKey Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education of China, Chongqing University, Chongqing 400044, China
fujianqinabc@163.com

Shuqian Wang

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
1350800863@qq.com

1Corresponding author.

ASME doi:10.1115/1.4036955 History: Received December 14, 2016; Revised May 21, 2017

Abstract

A combined ORC was proposed for both engine coolant energy recovery (CER) and exhaust energy recovery (EER), and it was applied to a gasoline direct injection (GDI) engine to verify its waste heat recovery (WHR) potential. After several kinds of organic working medium were compared, R123 was selected as the working fluid of this ORC. Two cycle modes, low-temperature cycle and high-temperature cycle were designed according to the evaporation way of working fluid. The working fluid is evaporated by coolant heat in low-temperature cycle but by exhaust heat in high-temperature cycle. The influence factors of cycle performance and recovery potential of engine waste heat energy were investigated by cycle simulation and parametric analysis. The results show that recovery efficiency of waste heat energy is influenced by both engine operating conditions and cycle parameters. At 2000 r/min, the maximum recovery efficiency of waste heat energy is 7.3% under 0.2 MPa BMEP but 10.7% under 1.4 MPa BMEP. With the combined ORC employed, the fuel efficiency improvement of engine comes up to 4.7 percent points under the operations of 2000 r/min and 0.2 MPa BMEP, while it further increases to 5.8 percent points under the operations of 2000 r/min and 1.4 MPa BMEP. All these indicate the combined ORC is suitable for IC engine WHR.

Copyright (c) 2017 by ASME
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