Strom aus Abgasen — Fahrzeuggerechte Entwicklung Thermoelektrischer Generatoren

Friedrich, Horst E.; Schier, Michael; Häfele, Christian; Weiler, Tobias

doi:10.1007/bf03222163

Cited by 8 publications

(3 citation statements)

References 3 publications

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“…Through the overall system optimization, the goal to realize a TEG system with a cost-benefit ratio of less than 95 €/(g/km) could be achieved. Thus, an economically attractive TEG system could have been presented, and the hope is (References: [1], 17,18 [2], 18 [3], 19 [4], 13 [5], 20 [6], 8 [7] Resulting design for the conv. vehicle in this work, [8] Resulting design for the hybrid vehicle in this work).…”

Section: Discussionmentioning

confidence: 99%

Holistic Development of Thermoelectric Generators for Automotive Applications

Kober

2020

Journal of Elec Materi

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One of the major challenges of the future automotive development is to achieve the required reductions of the CO 2 emissions. Therefore, it is necessary to investigate all potential technologies for efficiency improvement. In a combustion engine, about 2/3 of the chemical energy of the fuel is dissipated as waste heat. Due to its high temperature level, the waste heat in the exhaust gas is very promising for the technology of thermoelectric generators (TEG). In this work the methodology for a holistic TEG optimization for automotive vehicle applications will be presented. Thereby, all system interactions between the vehicle and the TEG are modelled and the CO 2 reduction can be optimized within the vehicle system. Moreover the costs are calculated for each TEG design, and the method realizes an optimization of the cost-benefit ratio in a direct way. The optimization method is applied with a highly integrated TEG design, which has been developed to be compact and lightweight. Through the combination of improvements in TEG design and system optimization, a gravimetric power density of 267 W/kg and a volumetric power density of 478 W/dm^3 could be achieved. These power densities are about 900% and 700%, respectively, higher than the state of the art. The optimization method was applied exemplarily to a conventional vehicle (Volkswagen Golf VII) and a hybrid vehicle (Opel Ampera/Chevrolet Volt). As a result, reductions in consumption and CO 2 emissions of up to 2.2% for the conventional and 3.4% for the hybrid vehicle could be achieved within the worldwide harmonized light duty driving test cycle. The cost-benefit optimum is 81.3 €/ (g/km) for the conventional vehicle and 54.8 €/(g/km) for the hybrid vehicle in charge sustaining mode.

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Section: Discussionmentioning

confidence: 99%

Holistic Development of Thermoelectric Generators for Automotive Applications

Kober

2020

Journal of Elec Materi

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“…Many successful projects (e.g. : [4], [5], [7], [10], [II]) in this topic have led to the 3rd generation of Thermoelectric Generators for vehicle applications.…”

Section: Thermoelectric Energy Conversionmentioning

confidence: 99%

Upgrading hybrid-vehicles with a Thermoelectric Generator

Oetringer¹,

Kober²,

Altstedde³

2014

2014 Ninth International Conference on Ecological Vehicles and Renewable Energies (EVER)

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To meet the future development in vehicle drivetrains, the Institute of Vehicle Concepts of the German Aerospace Center (DLR) aims to prove, that exhaust heat recovery using a Thermoelectric Generator (TEG) is, even with more electrification, still a promising concept to increase efficiency. Together with material researches at the Fraunhofer Institute of Physical Measurement Techniques (IPM) in Freiburg, the DLRs next generation of TEG is adapted to the special boundary conditions in hybrid vehicles. After investigating and measuring these boundary conditions, a first potential analysis is made. In test cycles a potential reduction of fuel consumption of about 3 % is calculated. It has been shown, that under exemplary driving conditions the possible electric power output of a TEG can be increased, compared to conventional vehicle, despite the increased efficiency of the drivetrain in a hybrid. Keywords-thermoelectric generator; range extended and hybridelectric vehicles; potentials of thermoelectric energy conversion; boundary conditions for TEG integration; complete system analysis;I.

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“…Development of the gravimetric and volumetric power density for TEG over the years. (References: [1],16,17 [2],17…”

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confidence: 99%

Thermoelectric Generators for Automotive Applications: Holistic Optimization and Validation by a Functional Prototype

Kober

Knobelspies

Rossello

et al. 2020

Journal of Elec Materi

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Current research has led to a significant improvement at the system level of thermoelectric generators (TEG) for automotive applications. The previously low power density could be increased considerably up to 267 W/kg and 478 W/ dm 3. In addition, the cost-benefit ratio of the technology in the overall system of the vehicle was improved through intensive optimizations on system level. The results presented so far are based on measurement data of single thermoelectric modules (TEM) and simulation of the TEG system. In this paper the high simulative increases at the system level, achieved through a holistic optimization method, are validated by a functional prototype, completely equipped with TEM. Thereby, a functional prototype has been developed and built successfully and measured on a hot gas test bench. In the experiment all TEM show a stable power output and the highest gravimetric power density of automotive TEG systems known to the authors could be measured. Further tests will be performed with the functional prototype as described in the outlook. In addition to the successful tests, the simulation is validated with the detailed measurement data. After adapting the measurement method of the TEM for providing more accurate TEM measurement data as input for the simulation, a suitable match could be achieved between the TEG simulation and the experiment. In the measurement points performed so far, the accuracy of the simulated temperatures reaches more than 95%. The accuracy of the simulated output power is more than 97%.

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Strom aus Abgasen — Fahrzeuggerechte Entwicklung Thermoelektrischer Generatoren

Cited by 8 publications

References 3 publications

Holistic Development of Thermoelectric Generators for Automotive Applications

Holistic Development of Thermoelectric Generators for Automotive Applications

Upgrading hybrid-vehicles with a Thermoelectric Generator

Thermoelectric Generators for Automotive Applications: Holistic Optimization and Validation by a Functional Prototype

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