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Thermoelectric Power Generation using Waste-Heat Energy from Internal Combustion Engine

Author : D. T. Kashid, S. H. Barhatte and D. S. Ghodake

Pages : 7-15;
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The efficiency in an internal combustion engine ranges from 25% to 35%. About 40% of the overall fuel energy losses in a combustion engine are waste heat which is blown out with the exhaust gases and 30% is cooled away by the vehicle’s radiator. Even if a small fraction of the waste heat could be turned into useful energy again it would be a step in the right direction of improving fuel economy. Being one of the promising new devices for an automotive waste heat recovery, thermoelectric generators (TEG) are used now days. This paper focuses on generation of electrical energy with the help of thermoelectric power generator. Thermoelectric modules are used to convert thermal energy from a temperature gradient to electrical energy and it works on basic principle of Seebeck effect. Hence the selection of thermoelectric materials plays very important role for energy conversion in thermoelectric applications. Sizing up the heat exchanger is based on the size, orientation, and number of modules. After designing suitable heat exchanger, the thermoelectric modules are integrated on the heat exchanger for performance analysis.. In this work, the effort is on the performance of thermoelectric generator under various engine operating conditions like engine speed, mass flow rate of exhaust gas.

Keywords: Engine Exhaust, Figure of merit, Insulation, Seebeck Effect, Thermoelectric Module, Thermoelectric Generator, Waste Heat Recovery.


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