NDLI: Investigating Potential Efficiency Improvement for Light-Duty Transportation Applications Through Simulation of an Organic Rankine Cycle for Waste-Heat Recovery

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Edwards, K. Dean Robert, M. Wagner
Copyright Year	2010
Abstract	Modern diesel engines used in light-duty transportation applications have peak brake thermal efficiencies in the range of 40–42% for high-load operation with substantially lower efficiencies at realistic road-load conditions. Thermodynamic energy and exergy analysis reveals that the largest losses from these engines are due to heat loss and combustion irreversibility. Substantial improvement in overall engine efficiency requires reducing or recovering these losses. Unfortunately, much of the heat transfer either occurs at relatively low temperatures resulting in large entropy generation (such as in the air-charge cooler), is transferred to low-exergy flow streams (such as the oil and engine coolant), or is radiated or convected directly to the environment. While there are significant opportunities for recovery from the exhaust and EGR cooler for heavy-duty applications, the potential benefits of such a strategy for light-duty diesel applications are unknown due to transient operation, the low thermal quality of exhaust gases at typical driving conditions, and the added mass of the system. Waste-heat recovery efforts will directly compete with NOx aftertreatment systems for the limited thermal energy in the exhaust during low-load operation. We have developed an organic Rankine cycle model using GT-Suite® to investigate the potential for efficiency improvement through waste-heat recovery from the exhaust and EGR cooler of a light-duty diesel engine. Results from steady-state and drive-cycle simulations are presented, and we discuss the operational difficulties associated with transient drive cycles and competition between waste-heat recovery systems, turbochargers, aftertreatment devices, and other systems for the limited thermal resources at typical driving conditions.
Sponsorship	Internal Combustion Engine Division
Starting Page	811
Ending Page	822
Page Count	12
File Format	PDF
ISBN	9780791849446
DOI	10.1115/ICEF2010-35120
e-ISBN	9780791838822
Conference Proceedings	ASME 2010 Internal Combustion Engine Division Fall Technical Conference
Language	English
Publisher Date	2010-09-12
Publisher Place	San Antonio, Texas, USA
Access Restriction	Subscribed
Subject Keyword	Cycles Roads Heat losses Combustion Entropy Transportation systems Engines Exhaust systems Diesel engines Exergy analysis Coolants Turbochargers Brakes Low temperature Organic rankine cycle Flow (dynamics) Steady state Stress Thermal energy Transients (dynamics) Gases Exhaust gas recirculation Simulation Nitrogen oxides Diesel Exergy Thermal efficiency Waste heat Heat transfer
Content Type	Text
Resource Type	Article

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