Storing energy and powering small systems with mechanical springs made of carbon nanotube yarn
Storing energy and powering small systems with mechanical springs made of carbon nanotube yarn
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DOI：
10.1016/j.energy.2014.08.021
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发表时间：
2014-11-01
期刊：
影响因子：
9
通讯作者：
Livermore, Carol
中科院分区：
文献类型：
--
作者：
Hill, Frances A.;Havel, Timothy F.;Livermore, Carol
CNT（碳纳米管）纱线作为机械弹簧在张力下拉伸，用于驱动电负载和机械负载，以展示CNT纱线的高功率密度潜力、其计量能量释放潜力以及其在电力实际系统中的应用。的CNT纱线的储能特性的特征，和三个演示系统，存储能量在拉伸CNT纱线和释放它来驱动电气或机械负载的设计，操作和表征。当在张力下加载时，纱线以高达13.4 mJ/m的单位长度能量和高达7720 kJ/m（3）或6.7 kJ/kg的能量密度存储能量。CNT弹簧驱动演示系统包括一个机械弹弓和两个机械驱动电源。弹弓释放储存在拉伸CNT弹簧中的能量，快速发射抛射体，功率提取效率高达56%。第一电源使用基于擒纵的动力调节机构和压电能量转换将存储的机械能转换成电力。第二电源使用电磁转换系统将储存在CNT弹簧中的能量转换为电输出功率，而不调节从弹簧释放的能量的速率。这些装置表明，CNT纱线可用于使用提供高功率的快速释放装置和缓慢释放的擒纵计量系统来驱动机械和电气负载。(C)2014爱思唯尔有限公司版权所有。
CNT (carbon nanotube) yarns stretched in tension as mechanical springs are used to drive both electrical and mechanical loads in order to demonstrate the CNT yarns' potential for high power density, their potential for metered energy release, and their application to power practical systems. The energy-storing properties of the CNT yarn are characterized, and the design, operation, and characterization of three demonstration systems that store energy in stretched CNT yarns and release it to drive an electrical or mechanical load are presented. When loaded in tension, the yarn stores energy with an energy per unit length of up to 13.4 mJ/m and an energy density of up to 7720 kJ/m(3) or 6.7 kJ/kg. The CNT spring-driven demonstration systems include a mechanical slingshot and two mechanically-driven electric power supplies. The slingshot releases energy stored in a stretched CNT spring rapidly to launch a projectile, with up to 56% power extraction efficiency. The first electric power supply converts stored mechanical energy into electric power using an escapement-based power regulation mechanism and piezoelectric energy conversion. The second electric power supply uses an electromagnetic conversion system to convert energy stored in the CNT spring to electric output power without regulating the rate of energy release from the spring. The devices demonstrate that CNT yarn can be used to drive mechanical and electrical loads using both quick-release devices that provide high power, and slow-release, escapement-metered systems. (C) 2014 Elsevier Ltd. All rights reserved.