Research Information System
El-Cezeri Journal of Science and Engineering, vol.7, no.3, pp.1088-1100, 2020 (Scopus)
In this study, numerical analysis of thermoelectric generator (TEJ) where exhaust waste heat energy of a spark-ignition engine conversion to electrical energy performed using computational fluid dynamics (CFD). A 3-layer TEJ design, consisting of a middle exhaust exchanger and two cooling water exchangers placed on both surfaces of the middle exhaust exchanger created. In the TEJ design, the engine cooling water (MSS) temperature and flow values used in addition to the exhaust gas temperature and flow values of the 2-cylinder, water-cooled spark ignition engine. In TEJ, the hot and cold side heat exchanger surface area designed to be placed 2x12 = 24 pieces of 50x50 mm sized thermoelectric modules selected for the target to produce 300 W DC electrical energy. A separator plate placed in the middle exhaust exchanger. Flow guiding fins at certain angles positioned on both surfaces of the separator plate as not to resistance the exhaust gas flow. A spreader added to the inlet of the middle exhaust exchanger and a nozzle at the outlet. In the cooling water heat exchanger, labyrinth channels created in which MSS can circulate. As a result, it was determined that the temperature difference (ΔT) increased by 32.45% by dividing the heat exchanger internal volume with the separating plate into two equal parts, and also the ΔT increased by 18.79% by adding flow guide vanes on the separator plate surface. Also, according to reference TEJ, a more homogeneous temperature distribution was obtained on hotcold heat exchanger surfaces with the TEJ structure where the separator plate and flow guiding wings added.