Simulate, evaluate the temperature performance of TEG when changing the height and angle of inclined plates

Abstract

Thermoelectric generators (TEG) have attracted considerable attention for the recovery of waste heat of internal combustion engines. In this study, a three-dimensional digital model for engine-based emission generator (ETEG) was developed based on Ansys Fluent simulation platform. By considering the detailed shape of the thermoelectric generator (TEG) and the thermal zones, along with the change in height and angle of the inclined plate. From the various changes studied and the design, optimization proposal was made. It was found that the inclined plate size should be moderate to balance the heat transfer for the TEG modules and reduce the pressure along the inclined plates. Increasing the number of inclined plates can improve thermal efficiency. However, because more space and TEG modules are needed, system size and cost should also be considered. Although it is only possible to place the slant plates at the inlet of the slant plate, it is possible to increase the heat transfer coefficient for the entire TEG hot surface. To ensure efficient use of hot emissions, the angle of inclined plates should be large enough, especially for downstream locations. Since larger inclined angle angles significantly increase the pressure drop, it is suggested that the angle of inclined plates change, with the angle increasing along the flow direction, possibly as a middle lock to balance the heat transfer and pressure drop. A single TEG design may not be suitable for all engine operating conditions and adjusting the number of inclined plates and inclined corners according to different engine operating conditions can improve performance.