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Research Papers: Internal Combustion Engines

A Combined Organic Rankine Cycle With Double Modes Used for Internal Combustion 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
e-mail: zhugh1219@126.com

Jingping Liu

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

Jianqin Fu

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

Shuqian Wang

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

1Corresponding author.

Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 14, 2016; final manuscript received May 21, 2017; published online June 27, 2017. Assoc. Editor: David L. S. Hung.

J. Eng. Gas Turbines Power 139(11), 112804 (Jun 27, 2017) (9 pages) Paper No: GTP-16-1583; doi: 10.1115/1.4036955 History: Received December 14, 2016; Revised May 21, 2017

A combined organic Rankine cycle (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 brake mean effective pressure (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% points under the operations of 2000 r/min and 0.2 MPa BMEP, while it further increases to 5.8% points under the operations of 2000 r/min and 1.4 MPa BMEP. All these indicate that the combined ORC is suitable for internal combustion (IC) engine WHR.

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Figures

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Fig. 1

Schematic diagram of combined ORC for IC engine WHR: (1) pump, (2) heat exchanger, (3) superheater, (4) valve, (5) turbine, and (6) condenser

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Fig. 2

T-s diagrams for two kinds of combined ORCs: (a) low-temperature cycle and (b) high-temperature cycle

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Fig. 3

T-s diagram for low-temperature ORC

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Fig. 4

Effective flow rate range of working fluid in low-temperature cycle: (a) case 1 and (b) case 2

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Fig. 5

WHR efficiency of combined ORC (low-temperature cycle): (a) case 1 and (b) case 2

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Fig. 6

The improvement of IC engine fuel efficiency (low-temperature cycle): (a) case 1 and (b) case 2

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Fig. 7

T-s diagram for high-temperature ORC

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Fig. 8

Effective flow rate range of working fluid in high-temperature cycle: (a) case 1 and (b) case 2

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Fig. 9

WHR efficiency of combined ORC (high-temperature cycle): (a) case 1 and (b) case 2

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Fig. 10

The improvement of engine fuel efficiency (high-temperature cycle): (a) case 1 and (b) case 2

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