An innovative thermal switch device using a thin metallic film electrostatically actuated by an electrode mainly conceived for caloric cooling is studied. Our study focuses on the characterization of the thermal conductance at the interface for the “on” and “off” states. Our setup uses the current passing through the metallization of the film as a heater, while the temperature is deduced from the measurement of its electrical resistivity. Using a thermal diffusion model and our measurements, we deduce the on and off state thermal conductances, and we achieve an on/off conductance ratio of 103. Lastly, we use a simple finite-time thermodynamic model to estimate the efficiency at maximum power, and we would obtain by integrating a standard electrocaloric film in our thermal switch. The result is a micro-refrigerator working at 85% of Carnot efficiency with a power density of 228 W g−1 which is far more than what it has been currently demonstrated.

中文翻译：

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一种静电致动热敏薄膜热敏开关装置

研究了一种使用金属薄膜的创新热开关装置，该薄膜由主要用于热量冷却的电极进行静电驱动。我们的研究侧重于“开”和“关”状态下界面处的热导特性。我们的设置使用通过薄膜金属化层的电流作为加热器，而温度则从其电阻率的测量中推导出来。使用热扩散模型和我们的测量，我们推导出开和关状态热导，我们实现了 103 的开/关电导比。最后，我们使用一个简单的有限时间热力学模型来估计最大功率下的效率，我们将通过在我们的热开关中集成一个标准的电热膜来获得。