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Whatever happened to…
| 题名： | Whatever happened to… |
| 正文语种： | eng |
| 作者： | Toby Clark |
| 摘要： | While some alternative energy systems are suitable as primary power sources -batteries and fuel cells, for instance - others are more suited to being interim or supplementary power providers. Ultracapacitors are increasingly seen as a short-term source of electrical energy, as they can store and release energy at a high rate -certainly faster than equivalently-sized batteries. But alternatives based on kinetic rather than electrical energy also can store and release energy relatively rapidly. One of the most straightforward methods of energy storage is the flywheel: set it spinning and it retains its kinetic energy, only losing some energy to friction and air resistance. Connect it to a motor/ generator, and you can spin it up with electricity - ideally with cheap energy such as the regenerative braking of an electric vehicle. Switching the motor to act as a generator harvests that energy at any time. The flywheel is simple, and has the advantage of long life. |
| 出版年： | 2021 |
| 期刊名称： | Transport engineer |
| 期： | May |
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