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Title: Working fluid selection and optimal power-to-weight ratio for ORC in long-haul trucks
Authors: Pili, Roberto
Castro Pastrana, Jesus D.
Romagnoli, Alessandro
Spliethoff, Hartmut
Wieland, Christoph
Keywords: Truck
Organic Rankine Cycle
DRNTU::Engineering::Mechanical engineering
Issue Date: 2017
Source: Pili, R., Castro Pastrana, J. D., Romagnoli, A., Spliethoff, H., & Wieland, C. (2017). Working Fluid Selection and Optimal Power-to-Weight Ratio for ORC in Long-Haul Trucks. Energy Procedia, 129, 754-761. doi:10.1016/j.egypro.2017.09.116
Series/Report no.: Energy Procedia
Abstract: In 2013, about 82% of the total CO2 emissions from transportation systems in the U.S. were caused by road transportation, highly based on internal combustion engines (ICE). Organic Rankine Cycles (ORC) are a waste heat recovery (WHR) technology that can contribute significantly to reduce environmental impact of road transportation. A trade-off has to be found between the improved fuel energy utilization and the weight and volume of the ORC, which increase the vehicle load and reduce the available space for transportation. In the present work, 17 working fluids are analyzed as possible candidates for WHR with direct-evaporation ORC in long-haul trucks. The preheater/evaporator is modelled as a finned shell-and-tube heat exchanger, while the condenser is an air-cooled finned flat-tube heat exchanger, as in common truck radiators. The ORC process is optimized for each fluid in terms of maximum power output, taking into account the impact of the working fluid on the heat exchanger weight and volume. The heat exchangers are modelled in MATLAB®. The results show that acetone and ethanol can recover more than 6 kW of mechanical power, but the system would present large weight and required space. Isobutane shows the highest power-to-weight and power-to-volume ratio (234 W/kg and 277 W/dm3 resp.), but the net power output is lower. Cyclopentane and pentane allow a good trade-off between power output and space requirement. The discussed procedure can be also applied to other transportation systems, where the condenser might have to be adapted to different boundary conditions.
ISSN: 1876-6102
DOI: 10.1016/j.egypro.2017.09.116
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2017 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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