Cooling - Revision history

Apm: /* Related / added Limits of power density imposed by limits of cooling

2024-09-15T18:32:13Z

← Older revision		Revision as of 20:32, 15 September 2024
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	* [[Cooling by heating]]		* [[Cooling by heating]]
	----		----
			* [[Limits of power density imposed by limits of cooling]]
	* [[Power density]]		* [[Power density]]

Apm: /* Taking cooling to its limit */ transferred content over to page The limits of cooling

2024-09-15T07:07:30Z

Taking cooling to its limit: transferred content over to page The limits of cooling

← Older revision		Revision as of 09:07, 15 September 2024
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	See main page: [[The limits of cooling]]		See main page: [[The limits of cooling]]

	~~{{speculativity warning}} <br>~~

	~~'''Application cases may include:'''~~
	* [[Hyper high throughput microcomponent recomposition]]
	* [[Carriage particle accelerators]] (for space rockets)
	* [[Nuclear fusion]]
	* ... military horrors :(

	~~'''Strategies that could be employed include:'''~~
	* Choice of best materials as the thermal mass (this is beyond metamaterial emulatability)
	* Choice of best materials as the thermal conductors (this is beyond metamaterial emulatability)
	* Choice of best materials for applying eventual tricks (this is beyond metamaterial emulatability)
	* '''Thermal mass capsules transported on tracks providing good thermal contact.'''
	* Trick: Active squeeze-out of degrees of freedom from the perspective of the [[equipartitioning theorem]]

	~~{{wikitodo\|discuss these in detail}}~~

	~~=== Choice of materials ===~~

	* Best for thermal conduction seems diamond
	* Best for thermal resilience/[[refractory]]ness (and still very good for conduction) seems [[moissanite]] (gem quality silicon carbide)
	* Best for thermal mass seems water [[high pressure]] can be easily safely contained by nanoencapsulations

	~~=== Cooling by capsule transport & its optimization ===~~

	~~[[Thermal energy transport]] via heat conduction can be very fast. <br>~~
	~~Especially across short distances. But longer macroscale distances is slows down. Nonlinearly. <br>~~
	~~One way to counter that is to physically transport thermal masses. <br>~~
	~~'''There are some interesting tradeoffs/optimizations to make.''' <br>~~
	~~Thus there should be:~~
	* some optimal cooling transport speed depending on details of design choices. <br>
	* some optimal scale of thermal-mass-transport-capsules

	~~'''Optimizing speed:'''~~
	* PRO: Higher speed means faster heat removal. Trivial.
	* CON: Speeding up to high speeds means higher dissipative losses from ([[wearless]]) friction <br>leading to even more heat needing removal. <br> Unfortunately very low friction suspension (like means of [[levitation]]) are not an option at the hot side <br>due to them providing insufficient thermal contact.<br>

	~~'''Optimizing scale:'''~~
	* PRO: Bigger thermal-mass-capsules means less thermally conductive bearing area per thermal mass
	* CON: Bigger thermal-mass-capsules means (nonlinear) increase in charge-up-time of these capsules

	~~=== Squeezeout of degrees of freedom of thermal energy ===~~

	~~See related topic: [[entropomechanical converter]]~~

	~~Note: The following is wasteful as it actively increases the devaluation of energy (irreversibly converting free to bond energy). <br>~~
	~~This seems only useful for boosting performance (not efficiency) while keeping system volume small.~~

	~~Basically the idea is to '''accelerate the dumping of heat on the cold side.'''~~
	* thermal-mass-capsules contain bundles of chain molecules attached to two end-plates
	* hot side: bundle-capsules arrive stretched out thermal – normal suck-up
	* hot side: end plates are released (leaving [[machine phase]]) further thermal suck-up => loss of potentially recuperable free energy
	* transport: bundles-capsules are transported to cold side
	* cold side: bundles-capsules are pulled apart by force (injection of free energy) accelerating the release of stored thermal energy due to further elevated temperature
	* transport back and repeat

	~~By pulling the chain molecules straight they loose degrees of freedom ([[equipartitioning theorem]]). <br>~~
	~~With conservation and fast adiabatic pulling the same energy concentrate in fewer DOFs. Temperature rises accordingly. <br>~~
	~~Higher temperature means higher thermal gradient means higher speed of thermal flow. <br>~~
	~~As desired and as is the point of the whole exercise. <br>~~
	~~Another alternate way to look at the chain molecule stretching process is to interpret it as a forcing of disorder~~
	~~from position space into impulse space.~~

	~~'''Limits:''' <br>~~
	~~The chain molecules need to be both~~
	* thermally resilient and
	* highly flexible.
	~~This is only possible to a limited degree. <br>~~
	~~'''Silicones might be the best bet allowing temperatures to about ~600K or ~300°C'''~~

	~~Unfortunately emulation by [[mechanical metamaterial]]s is not viable. <br>~~
	~~While chains made of [[moissanite]] (SiC) [[crystolecule]]s would be superbly resistant against very high temperatures, <br>~~
	~~they would likely not provide a sufficient volumetric density of mechanically squeezable thermal degrees of freedom <br>~~
	~~due to the size of the individual chain-links being at least several dozens or rather hundreds atoms each.~~

	== Related ==		== Related ==

Apm: some review and cleanup of upper part of the page

2024-09-15T06:53:41Z

some review and cleanup of upper part of the page

← Older revision		Revision as of 08:53, 15 September 2024
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	* mundane and important practical systems and		* mundane and important practical systems and
	* especially in systems that aim to go to the absolute limits of what is possible		* especially in systems that aim to go to the absolute limits of what is possible

	The latter by nature goes in quite speculative territory as <br>		The latter by nature goes in quite speculative territory as <br>
	it's not ~~very~~ compatible with [[conservative estimation]] and [[exploratory engineering]].		it is not compatible with [[conservative estimation]] and [[exploratory engineering]]. <br>

			The latter relates to a common misconception about the limits of power density: <br>
			Taking stated numbers too literally
			See page: [[Limits of power density imposed by limits of cooling]]

	== Practical cooling in [[gem-gum factories]] ==		== Practical cooling in [[gem-gum factories]] ==
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	Liquid helium temperatures are likely overkill. <br>		Liquid helium temperatures are likely overkill. <br>

	'''Anticooling:''' <br>		'''Anticooling (i.e. energy recuperative warming/heating):''' <br>
	To get the energy back that was invested to cool below room temperature and<br>		To get the energy back that was invested to cool below room temperature and<br>
	to not freeze clean room air in further up [[assembly levels]] <br>		to not freeze clean room air in further up [[assembly levels]] <br>
	the so far assembled parts-fragments need to be warmed up again before proceeding to higher assembly levels that <br>		the so far assembled parts-fragments need to be warmed up again before proceeding to higher assembly levels that <br>
	no longer involve (unguided) aligning of atomic bonds. <br>		no longer involve (unguided) aligning of atomic bonds. <br>
	Basically one needs to '''~~recuperatethe~~ cooling energy by heat engine'''.		Basically one needs to '''recuperate the cooling energy by heat engine'''.

	Given layer geometry of [[assembly level]] ([[assembly layers]]) as a possible self suggesting geometry <br>		Given layer geometry of [[assembly level]] ([[assembly layers]]) as a possible self suggesting geometry <br>

Apm: /* Taking cooling to its limit */ added link to yet unwritten page The limits of cooling

2024-09-14T16:57:49Z

Taking cooling to its limit: added link to yet unwritten page The limits of cooling

← Older revision		Revision as of 18:57, 14 September 2024
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	== Taking cooling to its limit ==		== Taking cooling to its limit ==

			See main page: [[The limits of cooling]]

	{{speculativity warning}} <br>		{{speculativity warning}} <br>

Apm: /* Related / added link to page Power density

2024-09-14T16:56:41Z

Related: added link to page * Power density

← Older revision		Revision as of 18:56, 14 September 2024
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	----		----
	* [[Cooling by heating]]		* [[Cooling by heating]]
			----
			* [[Power density]]

Apm at 09:15, 14 October 2022

2022-10-14T09:15:52Z

← Older revision		Revision as of 11:15, 14 October 2022
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	* especially in systems that aim to go to the absolute limits of what is possible		* especially in systems that aim to go to the absolute limits of what is possible
	The latter by nature goes in quite speculative territory as <br>		The latter by nature goes in quite speculative territory as <br>
	it's not very compatible with [[conservative estimation]] and [[~~explotratory~~ engineering]].		it's not very compatible with [[conservative estimation]] and [[exploratory engineering]].

	== Practical cooling in [[gem-gum factories]] ==		== Practical cooling in [[gem-gum factories]] ==

Apm: removed stub marker

2022-10-14T09:15:31Z

removed stub marker

← Older revision		Revision as of 11:15, 14 October 2022
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	~~{{Stub}}~~

	Cooling is both relevant in both		Cooling is both relevant in both
	* mundane and important practical systems and		* mundane and important practical systems and

Apm: /* Taking cooling to its limit */

2022-10-14T09:14:59Z

Taking cooling to its limit

← Older revision		Revision as of 11:14, 14 October 2022
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	'''Application cases may include:'''		'''Application cases may include:'''
	* [[Hyper high throughput microcomponent recomposition]]		* [[Hyper high throughput microcomponent recomposition]]
	* [[Carriage particle accelerators]]		* [[Carriage particle accelerators]] (for space rockets)
	* [[Nuclear fusion]]		* [[Nuclear fusion]]
			* ... military horrors :(

	'''Strategies that could be employed include:'''		'''Strategies that could be employed include:'''

Apm: /* Taking cooling to its limit */ added === Choice of materials ===

2022-10-14T09:12:47Z

Taking cooling to its limit: added === Choice of materials ===

← Older revision		Revision as of 11:12, 14 October 2022
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	* [[Hyper high throughput microcomponent recomposition]]		* [[Hyper high throughput microcomponent recomposition]]
	* [[Carriage particle accelerators]]		* [[Carriage particle accelerators]]
	* [[~~Fusion~~]]		* [[Nuclear fusion]]

	'''Strategies that could be employed include:'''		'''Strategies that could be employed include:'''
Line 56:		Line 56:

	{{wikitodo\|discuss these in detail}}		{{wikitodo\|discuss these in detail}}

			=== Choice of materials ===

			* Best for thermal conduction seems diamond
			* Best for thermal resilience/[[refractory]]ness (and still very good for conduction) seems [[moissanite]] (gem quality silicon carbide)
			* Best for thermal mass seems water [[high pressure]] can be easily safely contained by nanoencapsulations

	=== Cooling by capsule transport & its optimization ===		=== Cooling by capsule transport & its optimization ===

Apm: /* Taking cooling to its limit */ added section === Squeezeout of degrees of freedom of thermal energy ===

2022-10-14T09:07:34Z

Taking cooling to its limit: added section === Squeezeout of degrees of freedom of thermal energy ===

@@ Line 74: / Line 74: @@
 * PRO: Bigger thermal-mass-capsules means less thermally conductive bearing area per thermal mass
 * CON: Bigger thermal-mass-capsules means (nonlinear) increase in charge-up-time of these capsules
 == Related ==