The limits of cooling - Revision history

Apm: /* Related */

2025-11-16T20:11:22Z

← Older revision		Revision as of 22:11, 16 November 2025
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	* [[The challenge of high speeds near nanoscale]]		* [[The challenge of high speeds near nanoscale]]
	* [[Limits of power density imposed by limits of cooling]]		* [[Limits of power density imposed by limits of cooling]]
	---		----
	[[Unsupported rotating ring speed limit]] <br>		[[Unsupported rotating ring speed limit]] <br>
	when using ridiculously fast moving structures to remove heat. <br>		when using ridiculously fast moving structures to remove heat. <br>
	Questionable if it becomes relevant.		Questionable if it becomes relevant.

Apm: /* Related */ added link to: Unsupported rotating ring speed limit

2025-11-16T20:11:09Z

Related: added link to: Unsupported rotating ring speed limit

← Older revision		Revision as of 22:11, 16 November 2025
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	* [[The challenge of high speeds near nanoscale]]		* [[The challenge of high speeds near nanoscale]]
	* [[Limits of power density imposed by limits of cooling]]		* [[Limits of power density imposed by limits of cooling]]
			---
			[[Unsupported rotating ring speed limit]] <br>
			when using ridiculously fast moving structures to remove heat. <br>
			Questionable if it becomes relevant.

Apm: /* Cooling by capsule transport & its optimization */

2025-11-16T20:00:32Z

Cooling by capsule transport & its optimization

← Older revision		Revision as of 22:00, 16 November 2025
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	'''Optimizing speed:'''		'''Optimizing speed:'''
	* PRO: Higher speed means faster heat removal. Trivial.		* 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>		* 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> Well, hot enough one radiation energy transfer quickly goes up, but it still may become the bottleneck. <br>

	'''Optimizing scale:'''		'''Optimizing scale:'''

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

2024-09-15T18:31:15Z

← Older revision		Revision as of 20:31, 15 September 2024
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	* [[Cooling]]		* [[Cooling]]
	* [[The challenge of high speeds near nanoscale]]		* [[The challenge of high speeds near nanoscale]]
			* [[Limits of power density imposed by limits of cooling]]

Apm: added note on heatpipes

2024-09-15T18:29:19Z

added note on heatpipes

← Older revision		Revision as of 20:29, 15 September 2024
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	* … not about [[exploratory engineering]]		* … not about [[exploratory engineering]]
	* about having some fun collecting ideas on how to the boundaries of the possible could be pushed to the limit		* about having some fun collecting ideas on how to the boundaries of the possible could be pushed to the limit


	'''Application cases may include:'''		'''Application cases may include:'''
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	they would likely not provide a sufficient volumetric density of mechanically squeezable thermal degrees of freedom <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.		due to the size of the individual chain-links being at least several dozens or rather hundreds atoms each.

			== Misc ==

			{{wikitodo\|Ponder about how advanced means would compare to heat pipes which already set a high bar.}}

	== Related ==		== Related ==

Apm: /* Related */ added link to yet unwritten page The challenge of high speeds near nanoscale

2024-09-15T07:30:38Z

Related: added link to yet unwritten page The challenge of high speeds near nanoscale

← Older revision		Revision as of 09:30, 15 September 2024
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	* [[Cooling]]		* [[Cooling]]
			* [[The challenge of high speeds near nanoscale]]

Apm: transferred content over from page cooling with minimal changes

2024-09-15T07:06:54Z

transferred content over from page cooling with minimal changes

New page

{{speculative}}

'''Disclaimer:''' This page is …
* … not about feasibility analysis of [[advanced productive nanosystems]].
* … not about [[exploratory engineering]]
* about having some fun collecting ideas on how to the boundaries of the possible could be pushed to the limit

'''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. 
Especially across short distances. But longer macroscale distances is slows down. Nonlinearly. 
One way to counter that is to physically transport thermal masses. 
'''There are some interesting tradeoffs/optimizations to make.''' 
Thus there should be:
* some optimal cooling transport speed depending on details of design choices. 
* 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 leading to even more heat needing removal. Unfortunately very low friction suspension (like means of [[levitation]]) are not an option at the hot side due to them providing insufficient thermal contact. 

'''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). 
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]]). 
With conservation and fast adiabatic pulling the same energy concentrate in fewer DOFs. Temperature rises accordingly. 
Higher temperature means higher thermal gradient means higher speed of thermal flow. 
As desired and as is the point of the whole exercise. 
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:''' 
The chain molecules need to be both
* thermally resilient and
* highly flexible.
This is only possible to a limited degree. 
'''Silicones might be the best bet allowing temperatures to about ~600K or ~300°C'''

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

== Related ==

* [[Cooling]]