Analysis of a bimetallic micro heat engine for energy harvesting

Abstract

Micro heat engines have been proposed as an alternative to thermoelectric generators, to harvest thermal energy. Recently, we proposed a micro heat engine fabricated using a buckled bimetallic beam. In this paper, we present a finite element as well as an analytical model to predict the static behavior of such a heat engine. A lumped parameter model to predict the dynamic behavior of the engine has been discussed as well. Finally, the engine has been fabricated and tested to validate all models presented. The analytical model corroborates the finite element model accurately. In addition, a good correlation has been observed between the simulations and measurements. The engine is capable of operating at up to 10.4 Hz from a temperature difference of 44 K.