Study on Maximizing Exergy in Automotive Engines

Endo, Takanori; Kawajiri, S.; Kojima, Yoshio; Takahashi, Kaoru; Baba, T.; Ibaraki, Seiichi; Takahashi, Takashige; Shinohara, M.

doi:10.4271/2007-01-0257

Cited by 166 publications

(67 citation statements)

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“…Out of all the available sources, the internal combustion engines are the major consumers of fuel around the world. Out of the total heat supplied to the engine from the fuel, approximately, 30 to 40% is converted into useful mechanical work; the remaining heat is expelled to the environment through exhaust gases and engine cooling systems [1]. The recovery and utilization of wasteheat not only conserves fuel but also reduces the amount of waste heat and greenhouse gases damped to environment.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of a Waste-Heat-Utilization-Strategy Using Thermoelectric Device in C.I. Engine

2015

International Conference on Advancements and Recent Innovations in Mechanical, Production and Industrial Engineering

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Abstract-The present worldwide problem regarding automobiles is limitations of fuel and environmental pollution. When an internal combustion engine is operating, a large amount of energy is wasted as exhaust gas and with engine cooling. The efficiency of an internal combustion engine ranges from 30% to 40% and about 60% to 70% of the overall energy loss in a combustion engine is heat. The present experimental and computational study investigates waste heat recovery from the exhaust gas heat of an internal combustion engine using a thermocouple and heat pipes to produce electric power. This system proposes thermoelectric generation (TEG), working with heat pipes to produce electricity from a limited hot surface area. The current TEG system is directly connected to the exhaust pipe, to utilize the maximum possible heat available at the exhaust of C.I. engine. As designed, this heat recovery system produces a maximum of 1.54mV when the hot exhaust gas heats the evaporator surface of the heat pipe to 277o C. The results obtained, promises great possibilities for application of this technology in future energy-efficient vehicles.

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Section: Introductionmentioning

confidence: 99%

Experimental Analysis of a Waste-Heat-Utilization-Strategy Using Thermoelectric Device in C.I. Engine

2015

International Conference on Advancements and Recent Innovations in Mechanical, Production and Industrial Engineering

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“…Despite efforts to improve fuel economy in modern engines, approximately 60%-70% of the fuel power is still lost through the coolant and exhaust [1]. Moreover, the upcoming CO 2 emission legislation needs to be fulfilled.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Control of a Parallel Waste Heat Recovery System for Euro-VI Heavy-Duty Diesel Engines

et al. 2014

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This paper presents the modeling and control of a waste heat recovery system for a Euro-VI heavy-duty truck engine. The considered waste heat recovery system consists of two parallel evaporators with expander and pumps mechanically coupled to the engine crankshaft. Compared to previous work, the waste heat recovery system modeling is improved by including evaporator models that combine the finite difference modeling approach with a moving boundary one. Over a specific cycle, the steady-state and dynamic temperature prediction accuracy improved on average by 2% and 7%. From a control design perspective, the objective is to maximize the waste heat recovery system output power. However, for safe system operation, the vapor state needs to be maintained before the expander under highly dynamic engine disturbances. To achieve this, a switching model predictive control strategy is developed. The proposed control strategy performance is demonstrated using the high-fidelity waste heat recovery system model subject to measured disturbances from an Euro-VI heavy-duty diesel engine. Simulations are performed using a cold-start World Harmonized Transient cycle that covers typical urban, rural and highway driving conditions. The model predictive control strategy provides 15% more time in vapor and recovered thermal energy than a classical proportional-integral (PI) control strategy. In the case that the model is accurately known, the proposed control strategy performance can be improved by 10% in terms of time in vapor and recovered thermal energy. This is demonstrated with an offline nonlinear model predictive control strategy.Energies 2014, 7 6572

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“…However, this paper focusses on the waste heat available in the exhaust gases only. That choice has been justified by the fact that the exhaust gases have a higher exergy content than the coolant [4].…”

Section: Introductionmentioning

confidence: 99%

Modelling, sizing and testing a scroll expander for a waste heat recovery application on a gasoline engine

Legros

Guillaume

Diny

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Study on Maximizing Exergy in Automotive Engines

Cited by 166 publications

References 0 publications

Experimental Analysis of a Waste-Heat-Utilization-Strategy Using Thermoelectric Device in C.I. Engine

Experimental Analysis of a Waste-Heat-Utilization-Strategy Using Thermoelectric Device in C.I. Engine

Modeling and Control of a Parallel Waste Heat Recovery System for Euro-VI Heavy-Duty Diesel Engines

Modelling, sizing and testing a scroll expander for a waste heat recovery application on a gasoline engine

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