Abstract
This article aims to propose a cantilever based cooling device employing non-axis symmetric placement of bulk ferroelectric patches. Ambient mechanical vibrations produce large stresses in cantilevers resulting in elastocaloric effect associated with ferroelectrics. Further, design allows cascading of several cantilevers to achieve large cooling response. A finite element analysis of the system was performed using material properties of bulk 0.50Ba(Zr0.2Ti0.8)O3−0.50(Ba0.7Ca0.3)TiO3. An individual element could produce a peak elastocaloric effect of 0.02 K (324 K); whereas the proposed system could achieve a temperature drop of 0.2 K within 50 seconds (10 elements, 1.5 Hz). Furthermore, net cooling can be further improved about ~2 K (using 10 cantilevers) for a starting temperature of 358 K. This study shows that elastocaloric effect in ferroelectric materials is capable of converting waste mechanical vibration into refrigeration effect which is not reported so far.
Highlights
Development of suitable solid-state cooling technology can potentially usher in a new generation of efficient, eco-friendly and miniaturized refrigeration architecture
This is typical of a ferroelastic material and the resultant strain continually decreases upto a temperature of 358 K, drop is observed at 365 K
It can be visualized from the figure that upto an operating temperature of 346 K, the caloric effect remains negligible after which increases from 0.15 K to 0.3 K (358 K) for an applied stress of 140 MPa
Summary
Development of suitable solid-state cooling technology can potentially usher in a new generation of efficient, eco-friendly and miniaturized refrigeration architecture This is especially important for on-board thermal management of mobile electronic devices, where temperature regulation is a priority. In this regard, several techniques are being developed simultaneously including Peltier cooling and ferroic caloric effects (electrocaloric, elastocaloric and magnetocaloric)[1,2,3,4,5]. Through careful selection of operating parameters, this cantilever-based device has been designed to induce significant stress in piezoelectric material This in turn allows manifestation of large elastocaloric effects in bulk material, which is used as a heat exchanger system. Further details and analysis have been described
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