Water-Cooled Thermoelectric Generators for Improved Net Output Power: A Review

Björn Pfeiffelmann, Ali Cemal Benim and Franz Joos
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Björn Pfeiffelmann: Center of Flow Simulation, Faculty of Mechanical and Process Engineering, Düsseldorf University of Applied Sciences, D-40476 Düsseldorf, Germany
Ali Cemal Benim: Center of Flow Simulation, Faculty of Mechanical and Process Engineering, Düsseldorf University of Applied Sciences, D-40476 Düsseldorf, Germany
Franz Joos: Laboratory of Turbomachinery, Faculty of Mechanical Engineering, Helmut Schmidt University, D-22043 Hamburg, Germany

Energies, 2021, vol. 14, issue 24, 1-29

Abstract: Thermoelectric generators (TEGs) have the ability to convert waste heat into electrical energy under unfavorable conditions and are becoming increasingly popular in academia, but have not yet achieved a broad commercial success, due to the still comparably low efficiency. To increase the efficiency and economic viability of TEGs, research is performed on the materials on one hand and on the system connection on the other. In the latter case, the net output power of the cooling system plays a key role. At first glance, passive cooling seems preferable to active cooling because it does not affect the net electrical output power. However, as shown in the present review, the active cooling is to be preferred for net output power. The situation is similar in air and water-cooling. Even though air-cooling is easier to set up, the water-cooling should be preferred to achieve higher net output power. It is shown that microchannel cooling has similar hydraulic performance to conventional cooling and inserts increase the net output power of TEG. As the review reveals that active water-cooling should be the method of choice to achieve high net output power, it also shows that a careful optimization is necessary to exploit the potential.

Keywords: forced convection; heat transfer; net output power; thermoelectric generator; water-cooling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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