固态制冷装置中电热效应与焦耳热的解耦
Decoupling electrocaloric effect from Joule heating in a solid state cooling device
摘要：
我们报告的电热效应（ECE）在商业多层电容器的基础上钛酸钡电介质，一个有前途的候选人作为固态冷却设备的应用程序的热动力学分析。直接测量的样品的温度变化在不同的施加电压下的时间演变，使我们能够解耦焦耳加热和ECE的贡献。热平衡方程用于模拟系统不同部分之间的热耦合。焦耳加热和ECE的指纹可以在不同的时间尺度上解决。我们认为，焦耳加热和热耦合的设备到环境中，必须仔细考虑到在未来的发展，采用ECE的制冷技术。
英文摘要：
We report a heat dynamics analysis of the electrocaloric effect (ECE) in commercial multilayer capacitors based on BaTiO3 dielectric, a promising candidate for applications as a solid state cooling device. Direct measurements of the time evolution of the sample's temperature changes under different applied voltages allow us to decouple the contributions from Joule heating and from the ECE. Heat balance equations were used to model the thermal coupling between different parts of the system. Fingerprints of Joule heating and the ECE could be resolved at different time scales. We argue that Joule heating and the thermal coupling of the device to the environment must be carefully taken in to account in future developments of refrigeration technologies employing the ECE.
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