Multi-objective design optimization of a micro heat sink for Concentrating Photovoltaic/Thermal (CPVT) systems using a genetic algorithm

► Overall performance of fixed- and variable-channel-width heat sink is evaluated. ► Multi-objective optimization for geometric parameters and CFD model are applied. ► Introduction of stepwise channel-width variation enhances overall performance. ► Thermal entry length is negligibly small for the fixed-width configuration. ► The combined methodology proven valid in predicting the overall performance.