Thermoelectricity from a grill stove's waste heat

Abstract

     This study constructed a charcoal grill stove with the half-cylinder shape (46 cm width, 80 cm length and 90 cm heigh). The stove was made from 2 iron sheets fabricated into a curving cylinder with 2 layers, the space between the cylinders was stuffed with heat insulation 4.6 cm thick. Electricity was the conductive heat transfer using thermoelectric generator TEG SP1848SA-27145. A number of Peltiers were used for 1, 2, 4 and 10 modules connecting in a series circuit and then a parallel circuit of 4 and 10 modules. Measurements of voltage and current of each module due to its temperature difference between the hot side and cool side were performed. It was found that for the 4-pieces module, that 2 pieces in series and 2 pieces in parallel connection resulted in the maximum power of 0.9 W according to the homogenous temperature gradient, while the 10-pieces module generated the maximum power of 10 W.  The average generation efficiency was 4.3% and the electricity obtained in these modules was enough for supplying low current loads demand.