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A thermoelectric generator in exhaust systems of spark-ignition and compression-ignition engines. A comparison with an electric turbo-generator

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  • Fernández-Yáñez, P.
  • Armas, O.
  • Kiwan, R.
  • Stefanopoulou, A.G.
  • Boehman, A.L.

Abstract

Approximately a third of the fuel energy in internal combustion engines is wasted through the exhaust gas. Thermoelectric generators have been employed in automotive engines to recover energy from the exhaust system. The purpose of this work is to broaden the knowledge of thermoelectric generators and help designers to evaluate of their implementation in light-duty vehicles. Several works have tested a thermoelectric generator in spark-ignition engines and others in compression-ignition engines. This work provides results from the same thermoelectric generator prototype in a spark-ignition and in a compression-ignition engine to study the actual difference in thermoelectric energy recovery potential of both sorts of engine. Thermoelectric generators are also compared with a promising turbine-based waste energy recovery technology (electric turbo-generators). Full-load curves are swept to study the performance of the thermoelectric generator under limit conditions. The effect of by-passing the thermoelectric generator to limit the pressure drops produced at full-load conditions is also analysed. A validated three-dimensional Computational Fluid Dynamics model of a thermoelectric generator built and tested supports the study.

Suggested Citation

  • Fernández-Yáñez, P. & Armas, O. & Kiwan, R. & Stefanopoulou, A.G. & Boehman, A.L., 2018. "A thermoelectric generator in exhaust systems of spark-ignition and compression-ignition engines. A comparison with an electric turbo-generator," Applied Energy, Elsevier, vol. 229(C), pages 80-87.
    • Handle: RePEc:eee:appene:v:229:y:2018:i:c:p:80-87
    DOI: 10.1016/j.apenergy.2018.07.107
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    5. Ezzitouni, S. & Fernández-Yáñez, P. & Sánchez, L. & Armas, O., 2020. "Global energy balance in a diesel engine with a thermoelectric generator," Applied Energy, Elsevier, vol. 269(C).
    6. Ma, Xiaonan & Shu, Gequn & Tian, Hua & Xu, Wen & Chen, Tianyu, 2019. "Performance assessment of engine exhaust-based segmented thermoelectric generators by length ratio optimization," Applied Energy, Elsevier, vol. 248(C), pages 614-625.
    7. 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.
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    11. He, Min & Wang, Enhua & Zhang, Yuanyin & Zhang, Wen & Zhang, Fujun & Zhao, Changlu, 2020. "Performance analysis of a multilayer thermoelectric generator for exhaust heat recovery of a heavy-duty diesel engine," Applied Energy, Elsevier, vol. 274(C).
    12. Guo, Rui & Zhuo, Kai & Li, Qiang & Wang, Tao & Sang, Shengbo & Zhang, Hulin, 2023. "Triboelectric-electromagnetic hybrid generator assisted by a shape memory alloy wire for water quality monitoring and waste heat collecting," Applied Energy, Elsevier, vol. 348(C).
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    16. Samir Ezzitouni & Pablo Fernández-Yáñez & Luis Sánchez Rodríguez & Octavio Armas & Javier de las Morenas & Eduard Massaguer & Albert Massaguer, 2021. "Electrical Modelling and Mismatch Effects of Thermoelectric Modules on Performance of a Thermoelectric Generator for Energy Recovery in Diesel Exhaust Systems," Energies, MDPI, vol. 14(11), pages 1-15, May.
    17. Zhang, Ran & Zhang, Hui & Wang, Xu, 2021. "Lateral comparison of the coupling parameters on the novel hexagonal shaped cross flow thermoelectric generator," Energy, Elsevier, vol. 215(PB).
    18. Martí Comamala & Toni Pujol & Ivan Ruiz Cózar & Eduard Massaguer & Albert Massaguer, 2018. "Power and Fuel Economy of a Radial Automotive Thermoelectric Generator: Experimental and Numerical Studies," Energies, MDPI, vol. 11(10), pages 1-21, October.
    19. Ivan Ruiz Cózar & Toni Pujol & Eduard Massaguer & Albert Massaguer & Lino Montoro & Jose Ramon González & Martí Comamala & Samir Ezzitouni, 2021. "Effects of Module Spatial Distribution on the Energy Efficiency and Electrical Output of Automotive Thermoelectric Generators," Energies, MDPI, vol. 14(8), pages 1-16, April.

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