Modeling a Thermoelectric Generator Applied to Diesel Automotive Heat Recovery |
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Authors: | N Espinosa M Lazard L Aixala H Scherrer |
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Affiliation: | (1) Institut fur Physikalische Chemie, Universitaet Wien, A-1090 Wien, Austria |
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Abstract: | 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 Mg2Si/Zn4Sb3 for high temperatures followed by Bi2Te3 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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