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Energy storage: Difference between revisions
→Flywheels
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** Hence it's only viable to build a battery the size of a [[shipping container]], not smaller. | ** Hence it's only viable to build a battery the size of a [[shipping container]], not smaller. | ||
** This battery is '''not''' suited for electric vehicles. | ** This battery is '''not''' suited for electric vehicles. | ||
<!-- TODO: ===Lead-acid batteries=== --> | |||
===Flywheels=== | ===Flywheels=== | ||
[[Flywheels]] store energy mechanically by spinning a heavy rotor at high speeds. This has been implemented before, both inside vehicles {{x|but not necessarily storing enough energy to power the vehicle for more than a few kilometers at best}} ''and'' in stationary electrical systems {{x|with a much higher specific energy}}. | |||
If flywheels are made mostly of [[steel]] (which is mostly iron, an extremely abundant metal), we ''would'' have enough metal to build enough of them: | |||
{{dp | |||
|flywheels.practical.energy_by_mass | |||
|5 kWh per (450 kg) | |||
| | |||
|Based on this product as an example: http://www.rosseta.de/texte/pdat-t4.pdf | |||
}} | |||
{{dp | |||
|flywheels.theoretical.energy_by_mass | |||
|500 kJ/kg | |||
| | |||
|https://web.archive.org/web/20100710052927/http://www.pddnet.com/article-next-gen-of-flywheel-energy-storage/ | |||
}} | |||
{{dp | |||
|iron.reserves | |||
|180 billion tonnes | |||
|Global iron reserves recoverable | |||
|Source: Global iron ore reserves 2010-2021 - Statista | |||
}} | |||
{{calc | |||
|other_energy_storage_needed / flywheels.practical.energy_by_mass | |||
|% iron.reserves | |||
}} | |||
{{calc | |||
|other_energy_storage_needed / flywheels.theoretical.energy_by_mass | |||
|% iron.reserves | |||
}} | |||
However, it is unknown how much of other metals might be needed to make the flywheel systems - for example the rare earth magnets involved in the motor/generator components. This page needs more research. | |||
Viability of flywheels in vehicles is unknown too. Flywheel-based vehicles have existed for over a century, but they don't store enough energy to last more than a kilometer. Perhaps vacuum-sealed electrical type of flywheel could store more energy {{x|this page needs to clarify this more in previous paragraphs}}, but would the bumps of the road cause energy losses too quickly? This page needs more research. | |||
===Compressed air=== | ===Compressed air=== | ||
===Gravity blocks=== | ===Gravity blocks=== | ||