Power density: Difference between revisions
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imported>AssumeGoodWraith Restoring revision 1198811760 by Alwayslovebears: alright, not only did you ai generate a bunch of paragraphs, you removed a citation here (RW 32.2) |
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{{Short description|Power per volume}} | {{Short description|Power per volume}} | ||
{{about|power per volume|power per unit mass|Power-to-weight ratio|power per area|Surface power density|power per | {{about|power per volume|power per unit mass|Power-to-weight ratio|power per area|Surface power density|power per frenquency|Power spectral density}} | ||
{{More | {{More references|date=July 2020}} | ||
{{Infobox physical quantity | {{Infobox physical quantity | ||
| name = Power density | | name = Power density | ||
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}} | }} | ||
'''Power density''' | '''Power density''' is the amount of [[Power (physics)|power]] (time rate of [[energy transfer]]) per unit [[volume]].<ref>{{Cite book|last=Jelley|first=N. A. (Nicholas Alfred), 1946-|title=A dictionary of energy science|isbn=978-0-19-182627-6|location=Oxford|oclc=970401289}}</ref>It is typically measured in watts per cubic meter (W/m³) and represents how much power is distributed within a given space. In various fields such as physics, engineering, and electronics, power density is used to evaluate the efficiency and performance of devices, systems, or materials by considering how much power they can handle or generate relative to their size or volume.<ref>{{Cite web |title=Power density - Energy Education |url=https://energyeducation.ca/encyclopedia/Power_density |access-date=2024-01-25 |website=energyeducation.ca |language=en}}</ref> | ||
In [[energy transformation|energy transformers]] including [[battery (electricity)|batteries]], [[fuel cell]]s, motors, [[power supply]] units, etc., power density refers to a volume, where it is often called '''volume power density''', expressed as W/m<sup>3</sup>. | |||
In | In [[reciprocating engine|reciprocating]] [[internal combustion engine]]s, power density (power per [[swept volume]] or [[brake horsepower per cubic centimeter]]) is an important metric, based on the ''internal'' capacity of the engine, not its external size. | ||
==Examples== | ==Examples== | ||
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| style="text-align:left;"| '''[[Plutonium]]''' || [[Alpha decay]] || 1.94 || 38,360 | | style="text-align:left;"| '''[[Plutonium]]''' || [[Alpha decay]] || 1.94 || 38,360 | ||
|- | |- | ||
| style="text-align:left;"| '''[[Supercapacitor]] | | style="text-align:left;"| '''[[Supercapacitor|Supercapacitors]]''' | ||
|[[Supercapacitor|Capacitance]] | |[[Supercapacitor|Capacitance]] | ||
|up to 15000 | |up to 15000 | ||
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==See also== | ==See also== | ||
*[[Surface power density]], | *[[Surface power density]], energy per unit of area | ||
*[[Energy density]], energy per unit volume | *[[Energy density]], energy per unit volume | ||
*[[Specific energy]], energy per unit mass | *[[Specific energy]], energy per unit mass | ||
Latest revision as of 09:34, 30 June 2025
Template:Short description Script error: No such module "about". Template:More references Template:Infobox physical quantity
Power density is the amount of power (time rate of energy transfer) per unit volume.[1]It is typically measured in watts per cubic meter (W/m³) and represents how much power is distributed within a given space. In various fields such as physics, engineering, and electronics, power density is used to evaluate the efficiency and performance of devices, systems, or materials by considering how much power they can handle or generate relative to their size or volume.[2]
In energy transformers including batteries, fuel cells, motors, power supply units, etc., power density refers to a volume, where it is often called volume power density, expressed as W/m3.
In reciprocating internal combustion engines, power density (power per swept volume or brake horsepower per cubic centimeter) is an important metric, based on the internal capacity of the engine, not its external size.
Examples
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| Storage material | Energy type | Specific power (W/kg) | Power density (W/m3) |
|---|---|---|---|
| Hydrogen (in star) | Stellar fusion | 0.00184 | 276.5 |
| Plutonium | Alpha decay | 1.94 | 38,360 |
| Supercapacitors | Capacitance | up to 15000 | Variable |
| Lithium-ion | Chemical | ~250–350 | ~700 |
See also
- Surface power density, energy per unit of area
- Energy density, energy per unit volume
- Specific energy, energy per unit mass
- Power-to-weight ratio/specific power, power per unit mass
- Specific absorption rate (SAR)