10.1007/s40095-017-0234-8

A thermodynamic feasibility study of an Organic Rankine Cycle (ORC) for heavy-duty diesel engine waste heat recovery in off-highway applications

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  • Simone Lion*1,
  • Constantine N. Michos2,
  • Ioannis Vlaskos2,
  • Rodolfo Taccani3,
  1. Ricardo Deutschland GmbH, Schwäbisch Gmünd, 73529, DE University of Trieste, Trieste, 34128, IT
  2. Ricardo Deutschland GmbH, Schwäbisch Gmünd, 73529, DE
  3. University of Trieste, Trieste, 34128, IT
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Published in Issue 2017-04-24

How to Cite

Lion, S., Michos, C. N., Vlaskos, I., & Taccani, R. (2017). A thermodynamic feasibility study of an Organic Rankine Cycle (ORC) for heavy-duty diesel engine waste heat recovery in off-highway applications. International Journal of Energy and Environmental Engineering, 8(2 (June 2017). https://doi.org/10.1007/s40095-017-0234-8
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Abstract

Abstract This work assesses the possibility of fitting an organic Rankine cycle (ORC) system in a commercial agricultural tractor, recovering waste heat from a 300-kW brake power heavy-duty diesel engine. Two different cycle architectures are considered: a single evaporator layout to recover tail-pipe exhaust heat, and a parallel evaporator configuration to recover both exhaust and exhaust gas recirculation (EGR) heat. A second lower-temperature cooling circuit is also considered as possible different heat sink for the ORC system. Ten different working fluids have been assessed, and the optimum system configuration, in terms of fuel consumption, has been obtained applying an optimization algorithm to a process simulation model. A preliminary study has been carried out to evaluate the impact of the ORC system on the engine–vehicle-cooling system. A maximum fuel consumption reduction of 10.6% has been obtained using methanol and recovering heat from tail-pipe and EGR. However, considering also components and heat rejection performance, water steam, toluene and ethanol allow to obtain the best compromises between thermodynamic performance and engine–vehicle-cooling circuit impact.

Keywords

  • Waste heat recovery,
  • Organic rankine cycle,
  • Heavy-duty diesel engine,
  • Vehicle,
  • Off-highway,
  • Agricultural tractor
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