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Achieving High Engine Efficiency for Heavy-Duty Diesel Engines by Waste Heat Recovery Using Supercritical Organic-Fluid Rankine Cycle
Technical Paper
2006-01-3522
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A supercritical organic Rankine cycle (ORC) system for recovery of waste heat from heavy-duty diesel engines is proposed. In this system, an organic, medium-boiling-point fluid is selected as the working fluid, which also serves as the coolant for the charge air cooler and the EGR coolers. Because the exhaust temperature can be as high as 650 °C during the DPF regeneration, an exhaust cooler is included in the system to recover some of the high level exhaust energy. In the present ORC system, the expansion work is conducted by a uniflow reciprocating expander, which simplifies the waste-heat-recovery (WHR) system significantly. This reciprocating Rankine engine is more appropriate for on-road-vehicle applications where the condition for waste heat is variable. The energy level of waste heat from a heavy-duty diesel engine is evaluated by the analyses of the first and second law of thermodynamics. The second law analysis indicates that, although heat rejection from the engine coolant forms up to 20% of the fuel energy, it is of the least interest to WHR because only a small portion of it can be converted into mechanical work. The study of this paper demonstrates that, with the hybrid power system of the diesel engine and the Rankine engine operated with waste heat, substantial enhancement in engine power and improvement in fuel economy can be achieved.
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Teng, H., Regner, G., and Cowland, C., "Achieving High Engine Efficiency for Heavy-Duty Diesel Engines by Waste Heat Recovery Using Supercritical Organic-Fluid Rankine Cycle," SAE Technical Paper 2006-01-3522, 2006, https://doi.org/10.4271/2006-01-3522.Also In
Advanced Concepts in Product Engineering, Design and Innovation and Lifecycle Management
Number: SP-2056; Published: 2006-10-31
Number: SP-2056; Published: 2006-10-31
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