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Carbon Dioxide as Working Fluids in Transcritical Rankine Cycle for Diesel Engine Multiple Waste Heat Recovery in Comparison to Hydrocarbons

  • Peng Liu
  • Gequn Shu
  • Hua TianEmail author
Article
  • 24 Downloads

Abstract

In consideration of the high-temperature characteristic of engine’s waste heat and stricter environmental regulations, natural substance, including CO2 and hydrocarbons, have been treated as promising working fluid for diesel engine waste heat recovery due to its environment friendly and excellent physical and chemical properties. This paper presented a comprehensive performance analysis on transcritical Rankine cycles for diesel engine multiple waste heat recovery using hydrocarbons and CO2 as working fluid. The optimal turbine inlet pressures corresponding to maximum net power output, maximum exergy efficiency and minimum electricity production cost (EPC) were obtained. The effect of working fluid on these optimal pressures has been discussed. For fluids with low critical temperature, the optimal pressure corresponding to maximum net power output is lower than the one for maximum exergy efficiency, while the opposite results can be found for fluid with high critical temperature. Then, the effect of various working fluid properties in transcritical cycle performance is discussed. Comparison results show that CO2 obtains only more power output than Ethane, Propane and Propene, but CO2 is capable of absorbing more energy from engine coolant and regeneration heat with comparable total heat transfer areas and has an advantage in turbine size, particularly for hydrocarbons with high critical temperature.

Keywords

transcritical Rankine cycle natural working fluid multiple waste heat performance comparison 

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Notes

Acknowledgements

The authors would like to acknowledge the National Key Research and Development Plan of China (2017YFE0102800) and the National Natural Science Foundation of China (No. 51676133) for grants and supports.

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Copyright information

© Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of EnginesTianjin UniversityTianjinChina

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