Numerical Investigation of the Effect of Heat Sinks with Various Fin Geometries on the Performance of a Thermoelectric Generator

Abstract

In this study, the effect of heat sink geometries on the performance of a thermoelectric gen-erator was researched. In this context, fins with different geometries (flatfin, square pinfin, hexagonal pinfin, and circle pinfin) placed on an aluminum heat sink, and their effects on heat transfer and electricity generation were investigated numerically. Calculations were carried out according to three different hot surface temperatures andfive different air veloc-ities. As a result of this study, it was determined that the electrical output increased with the increase in air velocity and hot surface temperature in al l geometries. The highest electrical outputs were obtained at 150 degrees C hot surface temperatures and 15,000 Reynolds numbers, while the lowest electrical outputs were obtained at 50 degrees C hot surface temperatures and 5000 Reynolds numbers in all geometries. The best thermal and electrical performance was obtained with a flat fin heat sink, and the worst performance was seen in the thermo-electric generator (TEG) system without a heat sink . The highest power outputs of the flat fin heat sink and without heat sink TEG systems were 6.42 W and 1 .12 W, respectively. In addition, the highest conversion efficiencies of the flat fin heat sink and without heat sink TEG systems were 14.94% and 5.54%, respectively.