scholarly journals Efficiency improvement of the hot blast generating system by waste heat recovery

2007 ◽  
Author(s):  
Pei-Hsun Lin ◽  
Pai-Hsiang Wang ◽  
Hui-Tien Chen ◽  
Wei-Lun Chung
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Efficiency Improvement ◽  
Hot Blast ◽  
Generating System

scholarly journals Enabling thermal efficiency improvement and waste heat recovery using liquid air harnessed from offshore renewable energy sources

2020 ◽  
Vol 275 ◽  
pp. 115351 ◽  
Author(s):  
Julian D. Osorio ◽  
Mayank Panwar ◽  
Alejandro Rivera-Alvarez ◽  
Chrys Chryssostomidis ◽  
Rob Hovsapian ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Thermal Efficiency ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Efficiency Improvement

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

2010 ◽  
Author(s):  
K. Dean Edwards ◽  
Robert M. Wagner
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Efficiency Improvement ◽  
Light Duty ◽  
Driving Conditions ◽  
Egr Cooler ◽  
Transportation Applications

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.

Thermo-Chemical Recuperation as an Efficient Way of Engine's Waste Heat Recovery

2014 ◽  
Vol 659 ◽  
pp. 256-261 ◽  
Author(s):  
Leonid Tartakovsky ◽  
Vladimir Baibikov ◽  
Marcel Gutman ◽  
Arnon Poran ◽  
Mark Veinblat
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Combustion Engine ◽  
Pollutant Emissions ◽  
Efficiency Improvement ◽  
Joint Operation ◽  
Engine Exhaust ◽  
Exhaust Gases ◽  
Reforming Reactions

It is known that about 30% of fuel energy introduced to an internal combustion engine (ICE) is wasted with engine exhaust gases. One of the promising ways of waste heat recovery is thermo-chemical recuperation (TCR). For the purpose of TCR realization, in principle any fuel may be used. However, utilization of renewable bio-alcohols, especially ethanol or methanol is the most favorable. The advantages of TCR over turbocharging are in the fact that its energy transfer is not limited by isentropic expansion and that the reforming process improves the fuel properties. A comprehensive theoretical analysis of the ICE with TCR was carried out using the developed model for simulation of the joint operation of ICE with alcohol reformer, when the ICE is fed by the alcohol reforming products and the energy of the exhaust gases is utilized to sustain endothermic reforming reactions. Simulation results show that it is possible to sustain endothermic reforming reactions with a reasonable reactor size. Modeling results point out a possibility of engine's efficiency improvement by up to 13% in comparison with ICE feeding by gasoline together with achievement of zero-impact pollutant emissions.

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