Axial Turbo-Expander Design for Organic Rankine Cycle Waste-Heat Recovery With Comparative Heavy-Duty Diesel Engine Drive-Cycle Performance Assessment

Despite the high thermal efficiency achieved by modern heavy-duty diesel engines, over 40% of energy contained in fuel is wasted as heat either cooling or exhaust gases. By recovering part energy, overall engine increases and pollutant emissions are reduced. Organic Rankine cycle (ORC) systems considered a favourable candidate technology to recover gas waste heat, because their simplicity small backpressure impact on performance consumption. The recovered can be transformed into electricity directly mechanical power. In this study, an axial turbine expander for ORC system was designed optimized which real-world data were available. consumption under various operating points investigated. Compared equipped with radial expander, design improved between 2 10% at low speeds. Finally, benefits utilising recovery trucks evaluated performing drive tests, it found that highest values NEDC HDUDDS these cycles generally involve more dynamic driving profiles. However, could reduction 5 4.8%, respectively.