具有高能效的自振动聚合物冰箱
Donglin Han1, Yingjing Zhang1, Cenling Huang1
1State Key Laboratory of Mechanical System and Vibration, Interdisciplinary Research Center, Institute of Refrigeration and Cryogenics, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Nature
|May 8, 2024
概括
一种新的电热薄膜装置利用电热机械协同作用进行自循环制冷. 这一突破可以在没有外部驱动器的情况下提供高冷却功率密度和性能系数 (COP),从而实现高效的局部热管理.
科学领域:
- 材料科学
- 热力学
- 固态物理
背景情况:
- 在介电材料中共存电热和电阻效应,为先进的热管理提供了潜力.
- 由于依赖外部驱动附件,目前的电热制冷器在冷却功率密度和性能系数 (COP) 上面临限制.
- 开发自行循环设备对于实现轻量化,紧的局部热管理至关重要.
研究的目的:
- 开发一种电热薄膜装置,将电热和电阻效应集成为自循环制冷.
- 利用聚合物铁电的电热机械协同作用,以提高热管理.
- 展示一个紧,高效,无外部驱动器的冰箱原型.
主要方法:
- 使用聚合物铁电材料制造30μm厚的电热薄膜装置.
- 使用一次性交流电刺激来诱导工作体的自循环热和机械启动.
- 在不同温度范围内直接测量冷却功率密度和功率系数 (COP).
主要成果:
- 该设备的冷却功率密度为6.5W/g,在零温度范围内最高COP超过58.
- 在一个开放的环境中,在4K的温度范围内记录了大约24的COP,相当于32%的热力学效率.
- 与被动冷却相比,薄膜冰箱在应用到电子芯片时显示出额外的17.5K温度下降.
结论:
- 研发的电热薄膜装置成功地整合了电热机械协同作用,从而消除了对外部驱动器的需求.
- 该设备可显著提高冷却功率密度和COP,为高效的局部热管理解决方案铺平道路.
- 这种柔软的聚合物冰箱为电子设备及其他设备的自动,局部热管理提供了有前途的技术.
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