Current Possibilities of Thermoelectric Technology Relative to Fuel Economy

Mori, Masayoshi; Yamagami, Takeshi; ODA, Nobuyuki; Hattori, Makoto; Sorazawa, Mitsumasa; Haraguchi, Tomohide

doi:10.4271/2009-01-0170

Cited by 29 publications

(27 citation statements)

References 2 publications

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“…8). This effect has already been reported by Mori et al, 19 who found an optimum number of thermoelements within a TEG. Few details are given concerning internal thermoelement connection, but connection in series has been assumed.…”

Section: Influence Of N Xsupporting

confidence: 84%

Modeling a Thermoelectric Generator Applied to Diesel Automotive Heat Recovery

Espinosa

Lazard²,

Aixala

et al. 2010

Journal of Elec Materi

143

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Thermoelectric generators (TEGs) are outstanding devices for automotive waste heat recovery. Their packaging, lack of moving parts, and direct heat to electrical conversion are the main benefits. Usually, TEGs are modeled with a constant hot-source temperature. However, energy in exhaust gases is limited, thus leading to a temperature decrease as heat is recovered. Therefore thermoelectric properties change along the TEG, affecting performance. A thermoelectric generator composed of Mg 2 Si/Zn 4 Sb 3 for high temperatures followed by Bi 2 Te 3 for low temperatures has been modeled using engineering equation solver (EES) software. The model uses the finite-difference method with a strip-fins convective heat transfer coefficient. It has been validated on a commercial module with well-known properties. The thermoelectric connection and the number of thermoelements have been addressed as well as the optimum proportion of high-temperature material for a given thermoelectric heat exchanger. TEG output power has been estimated for a typical commercial vehicle at 90°C coolant temperature.

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Section: Influence Of N Xsupporting

confidence: 84%

Modeling a Thermoelectric Generator Applied to Diesel Automotive Heat Recovery

Espinosa

Lazard²,

Aixala

et al. 2010

Journal of Elec Materi

143

View full text Add to dashboard Cite

show abstract

“…Methods for optimizing TEG specifications have begun to be proposed in recent years with a view to TEG application in automobiles [1,2]. One such method that has been proposed is simulation capable of optimizing the TEG specifications so that it will yield maximum power or maximum efficiency [2].…”

Section: Introductionmentioning

confidence: 99%

“…Not only was a simulation created to calculate fuel economy effectiveness with positive and negative factors regarding fuel economy taken into account, but a scheme was also created to optimize the system as installed on a vehicle [1]. A method of use was also proposed to further enhance the fuel economy by installing the system on series hybrid vehicles that have higher exhaust gas temperatures and more stable exhaust gas flow rate than ordinary gasoline vehicles [3].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Fuel Economy Effectiveness of Exhaust Heat Recovery System Using Thermoelectric Generator in a Series Hybrid

Mori

Yamagami

Sorazawa

et al. 2011

SAE Int. J. Mater. Manuf.

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Simulation was employed to estimate the fuel economy enhancement from the application of an exhaust heat recovery system using a thermoelectric generator (TEG) in a series hybrid. The properties of the thermoelectric elements were obtained by self-assessment and set as the conditions for estimating the fuel economy. It was concluded that applying exhaust system insulation and forming the appropriate combination of elements with differing temperature properties inside the TEG could yield an enhancement of about 3% in fuel economy. An actual vehicle was also used to verify the calculation elements in the fuel economy simulation, and their reliability was confirmed.

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“…The most commonly quoted are the energy rejected through the coolant and exhaust systems, which has spurred large efforts to recover this thermal energy. Thermo-electric heat recovery systems typically convert <5% of the thermal energy flowing through them and require rejection of the heat at lower temperatures fundamentally requiring larger heat exchangers [3] . Closed cycles (e.g.…”

Section: Introductionmentioning

confidence: 99%

Turbo-Discharging: Predicted Improvements in Engine Fuel Economy and Performance

Williams¹,

Baker²,

Garner³

2011

SAE Technical Paper Series

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The importance of new technologies to improve the performance and fuel economy of internal combustion engines is now widely recognized and is essential to achieve CO 2 emissions targets and energy security. Increased hybridisation, combustion improvements, friction reduction and ancillary developments are all playing an important part in achieving these goals. Turbocharging technology is established in the diesel engine field and will become more prominent as gasoline engine downsizing is more widely introduced to achieve significant fuel economy improvements.The work presented here introduces, for the first time, a new technology that applies conventional turbomachinery hardware to depressurize the exhaust system of almost any internal combustion engine by novel routing of the exhaust gases. The exhaust stroke of the piston is exposed to this low pressure leading to reduced or even reversed pumping losses, offering >5% increased engine torque and up to 5% reduced fuel consumption. This method has the distinct advantage of providing performance and fuel economy improvements without significant changes to the structure of the engine, the combustion system or lubrication system. The Turbo-Discharging concept is introduced and analyzed. A combination of filling/emptying models and 1-D gas dynamic simulations were used to quantify the energy flows and identify optimum valve timings and turbomachine characteristics. 1-D gas dynamic simulation was then used to predict primary fuel economy benefits from TurboDischarging. Secondary benefits, such as extended knock limits are then discussed.

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Current Possibilities of Thermoelectric Technology Relative to Fuel Economy

Cited by 29 publications

References 2 publications

Modeling a Thermoelectric Generator Applied to Diesel Automotive Heat Recovery

Modeling a Thermoelectric Generator Applied to Diesel Automotive Heat Recovery

Simulation of Fuel Economy Effectiveness of Exhaust Heat Recovery System Using Thermoelectric Generator in a Series Hybrid

Turbo-Discharging: Predicted Improvements in Engine Fuel Economy and Performance

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