Power density - Revision history

Apm: added the link to Limits of power density imposed by limits of cooling to the intro, due to importance

2025-05-11T18:29:06Z

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	Lower bounds for maximally achievable power densities are [[exploratory engineering\|explored]] in <br>		Lower bounds for maximally achievable power densities are [[exploratory engineering\|explored]] in <br>
	later chapters covering [[electromechanical converters]]. They are ''very'' high.		later chapters covering [[electromechanical converters]]. They are ''very'' high.

			What is too often missed though is the <br>
			'''[[limits of power density imposed by limits of cooling]]'''.

	Power-densities for [[mechanical energy transmission]] are explored here on this wiki a bit (follow the link).		Power-densities for [[mechanical energy transmission]] are explored here on this wiki a bit (follow the link).

2025-05-11T18:27:35Z

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	* [[High performance of gem-gum technology]]		* [[High performance of gem-gum technology]]
	----		----
	* [[Limits of power density imposed by limits of cooling]]		* '''[[Limits of power density imposed by limits of cooling]]'''

	== External Links ==		== External Links ==

2024-09-15T18:36:05Z

← Older revision		Revision as of 20:36, 15 September 2024
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	* mechanical transmission example: 1.7*10^22 W/m³ (1.7 km/s) ([[Nanosystems]] equation (2.13) 10nN 1nm³) - huge dynamic friction!		* mechanical transmission example: 1.7*10^22 W/m³ (1.7 km/s) ([[Nanosystems]] equation (2.13) 10nN 1nm³) - huge dynamic friction!
	Example: The power transmitted by a gear divided by its volume. <br>		Example: The power transmitted by a gear divided by its volume. <br>

			Please note that there are lower '''[[limits of power density imposed by limits of cooling]]''' <br>
			for bulk volumes of densely packed nanomachinery running steady state.
	----		----
	'''Areal power density:'''		'''Areal power density:'''
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	* [[Higher throughput of smaller machinery]]		* [[Higher throughput of smaller machinery]]
	* [[High performance of gem-gum technology]]		* [[High performance of gem-gum technology]]
			----
			* [[Limits of power density imposed by limits of cooling]]

	== External Links ==		== External Links ==

2022-11-13T22:38:40Z

SI Units

← Older revision		Revision as of 00:38, 14 November 2022
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	----		----
	'''Areal power density:'''		'''Areal power density:'''
	* – W/m²		* – W/m² … See: [[Mechanical energy transmission]]

	{{todo\|How & in how far can the two types be made comparable? And is there a way to get an intuitive grasp on them?}} <br>		{{todo\|How & in how far can the two types be made comparable? And is there a way to get an intuitive grasp on them?}} <br>

2022-11-13T22:35:00Z

Ultimate limits & cooling: added note on Nanosystems

← Older revision		Revision as of 00:35, 14 November 2022
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	== Ultimate limits & cooling ==		== Ultimate limits & cooling ==

			Details in [[Nanosystems]] 11.7.4. Energy dissipation and efficiency

	While for		While for

2022-11-13T22:32:11Z

SI Units: added numbers from Nanosystems book

← Older revision		Revision as of 00:32, 14 November 2022
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	== SI Units ==		== SI Units ==

	There are two kinds of power densities:		There are two kinds of power densities. <br>
	* aerial power density – W/m²		Per area (areal) and per volume (volumetric).
	* volumetric ~~power density – W/m³~~		* areal power densities are relevant for power transmission
	* ~~aerial~~ power densities are relevant for power transmission
	* volumetric power densities are relevant for power conversion		* volumetric power densities are relevant for power conversion
			----
			'''Volumetric power density:'''
			* electromechanical conversion: >10^15 W/m³ ([[Nanosystems]] 11.7.3. Motor power and Power density)
			* mechanical transmission example: 1.7*10^19 W/m³ (1.0 m/s) ([[Nanosystems]] equation (2.13) 10nN 1nm³)
			* mechanical transmission example: 1.7*10^22 W/m³ (1.7 km/s) ([[Nanosystems]] equation (2.13) 10nN 1nm³) - huge dynamic friction!
			Example: The power transmitted by a gear divided by its volume. <br>
			----
			'''Areal power density:'''
			* – W/m²

	{{todo\|How & in how far can the two types be made comparable? And is there a way to get an intuitive grasp on them?}} <br>		{{todo\|How & in how far can the two types be made comparable? And is there a way to get an intuitive grasp on them?}} <br>

2022-08-08T17:46:40Z

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	* [https://en.wikipedia.org/wiki/Power_density Power density] – W/m³		* [https://en.wikipedia.org/wiki/Power_density Power density] – W/m³

	[[Category:Pages ~~containing~~ math]]		[[Category:Pages with math]]

2022-08-08T17:45:18Z

← Older revision		Revision as of 19:45, 8 August 2022
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	* [https://en.wikipedia.org/wiki/Power_density Power density] – W/m³		* [https://en.wikipedia.org/wiki/Power_density Power density] – W/m³

	[[Category:Pages ~~with~~ math]]		[[Category:Pages containing math]]

2022-08-08T17:44:48Z

← Older revision		Revision as of 19:44, 8 August 2022
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	* [https://en.wikipedia.org/wiki/Surface_power_density Surface power density] – W/m²		* [https://en.wikipedia.org/wiki/Surface_power_density Surface power density] – W/m²
	* [https://en.wikipedia.org/wiki/Power_density Power density] – W/m³		* [https://en.wikipedia.org/wiki/Power_density Power density] – W/m³

			[[Category:Pages with math]]

2022-08-08T17:27:15Z

put the two remaining todos together

← Older revision		Revision as of 19:27, 8 August 2022
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	Power-densities for [[mechanical energy transmission]] are explored here on this wiki a bit (follow the link).		Power-densities for [[mechanical energy transmission]] are explored here on this wiki a bit (follow the link).

	~~{{todo\|If possible get power densities from [[electromechanical converters]] and [[mechanical energy transmission]] in a form that is comparable. Despite different units ...}}~~

	== SI Units ==		== SI Units ==
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	* volumetric power densities are relevant for power conversion		* volumetric power densities are relevant for power conversion

	{{todo\|How & in how far can the two types be made comparable? And is there a way to get an intuitive grasp on them?}}		{{todo\|How & in how far can the two types be made comparable? And is there a way to get an intuitive grasp on them?}} <br>
			{{todo\|If possible get power densities from [[electromechanical converters]] and [[mechanical energy transmission]] in a form that is comparable. Despite different units ...}}

	== Ultimate limits & cooling ==		== Ultimate limits & cooling ==