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Performance Analysis of an Evaporator for a Diesel Engine–Organic Rankine Cycle (ORC) Combined System and Influence of Pressure Drop on the Diesel Engine Operating Characteristics

Author

Listed:
  • Chen Bei

    (College of Environmental and Energy Engineering, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China
    Collaborative Innovation Center of Electric Vehicles in Beijing, Pingleyuan, No. 100, Beijing 100124, China)

  • Hongguang Zhang

    (College of Environmental and Energy Engineering, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China
    Collaborative Innovation Center of Electric Vehicles in Beijing, Pingleyuan, No. 100, Beijing 100124, China)

  • Fubin Yang

    (College of Environmental and Energy Engineering, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China
    Collaborative Innovation Center of Electric Vehicles in Beijing, Pingleyuan, No. 100, Beijing 100124, China)

  • Songsong Song

    (College of Environmental and Energy Engineering, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China
    Collaborative Innovation Center of Electric Vehicles in Beijing, Pingleyuan, No. 100, Beijing 100124, China)

  • Enhua Wang

    (State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Qinghuayuan, Beijing 100084, China)

  • Hao Liu

    (College of Environmental and Energy Engineering, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China
    Collaborative Innovation Center of Electric Vehicles in Beijing, Pingleyuan, No. 100, Beijing 100124, China)

  • Ying Chang

    (College of Environmental and Energy Engineering, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China
    Collaborative Innovation Center of Electric Vehicles in Beijing, Pingleyuan, No. 100, Beijing 100124, China)

  • Hongjin Wang

    (College of Environmental and Energy Engineering, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China
    Collaborative Innovation Center of Electric Vehicles in Beijing, Pingleyuan, No. 100, Beijing 100124, China)

  • Kai Yang

    (College of Environmental and Energy Engineering, Beijing University of Technology, Pingleyuan No. 100, Beijing 100124, China
    Collaborative Innovation Center of Electric Vehicles in Beijing, Pingleyuan, No. 100, Beijing 100124, China)

Abstract

The main purpose of this research is to analyze the performance of an evaporator for the organic Rankine cycle (ORC) system and discuss the influence of the evaporator on the operating characteristics of diesel engine. A simulation model of fin-and-tube evaporator of the ORC system is established by using Fluent software. Then, the flow and heat transfer characteristics of the exhaust at the evaporator shell side are obtained, and then the performance of the fin-and-tube evaporator of the ORC system is analyzed based on the field synergy principle. The field synergy angle ( β ) is the intersection angle between the velocity vector and the temperature gradient. When the absolute values of velocity and temperature gradient are constant and β < 90°, heat transfer enhancement can be achieved with the decrease of the β . When the absolute values of velocity and temperature gradient are constant and β >90°, heat transfer enhancement can be achieved with the increase of the β . Subsequently, the influence of the evaporator of the ORC system on diesel engine performance is studied. A simulation model of the diesel engine is built by using GT–Power software under various operating conditions, and the variation tendency of engine power, torque, and brake specific fuel consumption (BSFC) are obtained. The variation tendency of the power output and BSFC of diesel engine–ORC combined system are obtained when the evaporation pressure ranges from 1.0 MPa to 3.5 MPa. Results show that the field synergy effect for the areas among the tube bundles of the evaporator main body and the field synergy effect for the areas among the fins on the windward side are satisfactory. However, the field synergy effect in the areas among the fins on the leeward side is weak. As a result of the pressure drop caused by the evaporator of the ORC system, the diesel engine power and torque decreases slightly, whereas the BSFC increases slightly with the increase of exhaust back pressure. With the increase of engine speed, power loss, torque loss, and BSFC increment increase gradually, where the most significant change is less than 1%. Compared with the diesel engine itself, the maximum increase of power output of the diesel engine–ORC combined system is 6.5% and the maximum decrease of BSFC is 6.1%.

Suggested Citation

  • Chen Bei & Hongguang Zhang & Fubin Yang & Songsong Song & Enhua Wang & Hao Liu & Ying Chang & Hongjin Wang & Kai Yang, 2015. "Performance Analysis of an Evaporator for a Diesel Engine–Organic Rankine Cycle (ORC) Combined System and Influence of Pressure Drop on the Diesel Engine Operating Characteristics," Energies, MDPI, vol. 8(6), pages 1-28, June.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:6:p:5488-5515:d:50823
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    References listed on IDEAS

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    1. Wang, Enhua & Zhang, Hongguang & Fan, Boyuan & Ouyang, Minggao & Yang, Kai & Yang, Fuyuan & Li, Xiaojuan & Wang, Zhen, 2015. "3D numerical analysis of exhaust flow inside a fin-and-tube evaporator used in engine waste heat recovery," Energy, Elsevier, vol. 82(C), pages 800-812.
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    Cited by:

    1. Yang, Fubin & Zhang, Hongguang & Yu, Zhibin & Wang, Enhua & Meng, Fanxiao & Liu, Hongda & Wang, Jingfu, 2017. "Parametric optimization and heat transfer analysis of a dual loop ORC (organic Rankine cycle) system for CNG engine waste heat recovery," Energy, Elsevier, vol. 118(C), pages 753-775.
    2. Ping, Xu & Yang, Fubin & Zhang, Hongguang & Xing, Chengda & Yu, Mingzhe & Wang, Yan, 2023. "Investigation and multi-objective optimization of vehicle engine-organic Rankine cycle (ORC) combined system in different driving conditions," Energy, Elsevier, vol. 263(PB).
    3. Alklaibi, A.M. & Lior, N., 2021. "Waste heat utilization from internal combustion engines for power augmentation and refrigeration," Renewable and Sustainable Energy Reviews, Elsevier, vol. 152(C).
    4. Ping, Xu & Yang, Fubin & Zhang, Hongguang & Xing, Chengda & Wang, Chongyao & Zhang, Wujie & Wang, Yan, 2022. "Energy, economic and environmental dynamic response characteristics of organic Rankine cycle (ORC) system under different driving cycles," Energy, Elsevier, vol. 246(C).
    5. Zhao, Xiaohuan & E, Jiaqiang & Zhang, Zhiqing & Chen, Jingwei & Liao, Gaoliang & Zhang, Feng & Leng, Erwei & Han, Dandan & Hu, Wenyu, 2020. "A review on heat enhancement in thermal energy conversion and management using Field Synergy Principle," Applied Energy, Elsevier, vol. 257(C).
    6. Rajesh Ravi & Senthilkumar Pachamuthu, 2018. "Design and Development of Innovative Protracted-Finned Counter Flow Heat Exchanger (PFCHE) for an Engine WHR and Its Impact on Exhaust Emissions," Energies, MDPI, vol. 11(10), pages 1-19, October.
    7. Ravi, Rajesh & Pachamuthu, Senthilkumar & Kasinathan, Padmanathan, 2020. "Computational and experimental investigation on effective utilization of waste heat from diesel engine exhaust using a fin protracted heat exchanger," Energy, Elsevier, vol. 200(C).
    8. Zhang, Wujie & Yang, Fubin & Zhang, Hongguang & Ping, Xu & Yan, Dong & Wang, Chongyao, 2022. "Application of two-phase pulsating flow in organic Rankine cycle system for diesel engine waste heat recovery," Energy, Elsevier, vol. 243(C).

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