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The paper looks at the key issues in terms of what thermoelectrics (TE) can and must do for the automotive industry through to 2020+.
A brief introduction to the topic of waste heat recuperation and thermoelectric generators (TEG) is followed in the first section of the paper by an illustration of the potential offered by a fictive TEG ideally rated for use in the exhaust system
of a passenger car with conventional powertrain, with an estimate of possible
benefits and costs. This begins by asking which minimum contribution a new
technology has to provide for it to be included by the automotive industry in the
package of measures needed to achieve future CO2 targets. A proposal is presented
as the basis for the subsequent observations. The paper then looks at the
necessary material/module efficiency and the required mean ZT value as well as
availability.
This is followed by a brief description of the objective, consortium, job split,
contents and scope together with a summary of selected results obtained with the
consortium project TEG2020 funded by the BMBF (German Federal Ministry of
Education and Research).
The very general theoretical observations in the first section are then compared
in the second section with selected results obtained in test bench and
vehicle measurements using the laboratory generator developed in the project.
The focus here is not on the generator itself but on the impact of the conventional
generator, the additional mass of the TEG and its exhaust gas backpressure,
auxiliary power consumption and the necessary recooling.
The project results show that it is possible to realize the fictive TEG featured
in the estimate of potential using the existing possibilities.