Recuperação de calor utilizando geradores termoelétricos de telureto de bismuto (Bi2Te3) assistidos por termossifões

Abstract

The reuse of thermal energy is becoming increasingly important due to its numerous benefits, such as significant reduction of environmental impacts, increased system efficiency, and cost reduction. The conversion of thermal energy into electrical energy occurs through the Seebeck Effect in thermoelectric generators. This effect is associated with the generation of an electric potential difference when two different materials are in contact at different temperatures. This relationship between temperature and the electrical properties of materials is known as thermoelectricity. The objective of this experimental study is to obtain the operating characteristic curves of Bismuth Telluride (Bi2Te3) thermoelectric generators, aiming to promote conscious energy use and minimize waste. To simulate an industrial situation, an open-circuit blower-type wind tunnel system capable of reproducing heated gases from industrial processes was developed. A set of finned thermosyphons, which are highly efficient passive heat transfer devices, was used to transfer the heat from the heated gases to the thermoelectric generator. In this way, it was possible to create the temperature difference necessary for the operation of the thermoelectric generators, as well as obtain the characteristic curve of the generated power. Furthermore, studies were conducted on the preheating of the inlet air caused by the passive heat transfer system, and on the thermal efficiency of the set. These experimental investigations contribute to the understanding and improvement of the direct conversion process from thermal energy to electrical energy, driving the conscious and efficient utilization of energy resources.