Pyroelectric generators (PEGs) can be used for thermal energy harvesting and present a potential alternative to thermoelectric generators. However, in contrary to thermoelectric generators, the PEG principle requires thermal transients to stimulate the conversion process. Such suitable thermal transients are rare in nature, hindering the deployment. In this paper, we present a micro thermomechanic-pyroelectric energy generator (μTMPG) that converts a stationary spatial thermal gradient into the required transient temperature profile across the PEG. The measured power output of the μTMPG is 3 μW from a temperature difference of 79.5 K. However, with an optimized design, a power output of 39.4 mW is estimated for the same temperature difference.

No abstract

No 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.

No abstract