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Waste Heat Recovery Concept to Reduce Fuel Consumption and Heat Rejection from a Diesel Engine
ISSN: 1946-391X, e-ISSN: 1946-3928
Published October 05, 2010 by SAE International in United States
Citation: Teng, H., "Waste Heat Recovery Concept to Reduce Fuel Consumption and Heat Rejection from a Diesel Engine," SAE Int. J. Commer. Veh. 3(1):60-68, 2010, https://doi.org/10.4271/2010-01-1928.
Fuel economy is critical for heavy-duty line haul applications. As fuel prices rise and impending fuel economy regulations are implemented, new ways to improve heavy-vehicle fuel economy will be in high demand. AVL Powertrain Engineering has undertaken a research and development project to demonstrate the feasibility of a Rankine Cycle Waste Heat Recovery (WHR) system. The goals of the project were to reduce the overall engine heat rejection, specific emissions and fuel consumption (CO₂ emissions) of heavy-duty diesel engines by converting heat that is typically wasted to the exhaust stack and through the EGR cooler to useable mechanical energy. A detailed thermodynamic analysis was conducted which laid the groundwork for working fluid selection and proper sizing of the WHR components. Based on the system specifications, a prototype WHR system was designed and built. The performance of the system was evaluated on a 10.8-liter heavy-duty on-highway diesel engine.