Thermal isolation - Revision history

Apm: /* Basics */

2021-07-25T11:03:11Z

Basics

← Older revision		Revision as of 13:03, 25 July 2021
Line 14:		Line 14:
	= Basics =		= Basics =

	Because of the [[scaling laws]] for surface-to-volume-ratio single isolated nanoscale parts would cool of / heat up ~~instantly~~ to average environment temperature. Thus thermal isolation layers makes only sense between macroscopic spaces.		Because of the [[scaling laws]] for surface-to-volume-ratio single isolated nanoscale parts would cool of / heat up very fast to average environment temperature. Thus thermal isolation layers makes only sense between macroscopic spaces.

	For thermal isolation one has to suppress:		For thermal isolation one has to suppress:

Apm: updated intro

2021-07-25T09:56:56Z

updated intro

← Older revision		Revision as of 11:56, 25 July 2021
Line 1:		Line 1:
			Maximizing for thermal isolation in products of [[technology level III\|advanced gemstone metamaterial technology]] is not as trivial <br>
			as maximizing for good mechanical properties with which the [[gemstone like compounds\|gemstone like base materials]] already come with <small>(See: [[High performance of gem-gum technology]])</small>. <br>

	~~Getting high thermal isolation in products of [[technology level III\|advanced atomically precise manufacturing]] is not so trivial.~~		In general the for mechanical reasons desired dense and stiff gemstone metamaterials have in their solid bulk <br>
	In general the desired dense and stiff gemstone metamaterials have low to ~~horrible~~ thermal isolation performance. ~~Thus they need to~~ be ~~tweaked~~.		form low to record level low thermal isolation performance (that is record level high thermal conduction properties).

			By:
			* choosing a base material that is perhaps not one of the best thermally conducting ones
			* picking crystal structures with lower symmetries (pseudo-amorphous)
			* and most importantly smartly structuring the material into a [[thermal metamaterial]]
			* integrating voids and means for IR reflection
			Exceptionally high thermal isolation levels should be achievable.

	= Basics =		= Basics =

Apm: /* Related / added two links Diamondoid heat pump systems * Gem-gum solid state heat pipes

2021-05-25T11:29:01Z

Related: added two links * Diamondoid heat pump systems * Gem-gum solid state heat pipes

← Older revision		Revision as of 13:29, 25 May 2021
Line 69:		Line 69:
	* [[Thermal metamaterial]]s		* [[Thermal metamaterial]]s
	* [[Diamondoid metamaterial]]s		* [[Diamondoid metamaterial]]s
			* [[Diamondoid heat pump system]]s – to charge or discharge a temperature difference across a thermal isolation layer
			* [[Gem-gum solid state heat pipe]]s – the opposite – maximizing heat condition rather than thermal isolation

	[[Category:Thermal]]		[[Category:Thermal]]

Apm: /* Related */ added Thermal metamaterials

2017-07-16T05:14:32Z

Related: added Thermal metamaterials

← Older revision		Revision as of 07:14, 16 July 2017
Line 67:		Line 67:
	= Related =		= Related =

	* [[Diamondoid ~~metamaterials~~]]		* [[Thermal metamaterial]]s
			* [[Diamondoid metamaterial]]s

	[[Category:Thermal]]		[[Category:Thermal]]

Apm: reordered categories - thermal first

2017-07-16T05:07:47Z

reordered categories - thermal first

← Older revision		Revision as of 07:07, 16 July 2017
Line 69:		Line 69:
	* [[Diamondoid metamaterials]]		* [[Diamondoid metamaterials]]

			[[Category:Thermal]]
	[[Category:Technology level III]]		[[Category:Technology level III]]
	[[Category:Technology level II]]		[[Category:Technology level II]]
	[[Category:Technology level I]]		[[Category:Technology level I]]
	~~[[Category:Thermal]]~~

Apm: Category:Thermal

2017-07-16T05:03:31Z

Category:Thermal

← Older revision		Revision as of 07:03, 16 July 2017
Line 73:		Line 73:
	[[Category:Technology level II]]		[[Category:Technology level II]]
	[[Category:Technology level I]]		[[Category:Technology level I]]
			[[Category:Thermal]]

Apm: new intro; major cleanup

2016-08-29T07:16:07Z

new intro; major cleanup

← Older revision		Revision as of 09:16, 29 August 2016
Line 1:		Line 1:

	~~Thermal~~ isolation in [[technology level III]] is ~~problematic when one restricts oneself to pure hydrocarbon systems~~.		Getting high thermal isolation in products of [[technology level III\|advanced atomically precise manufacturing]] is not so trivial.
	~~'''Diamond is~~ the ~~worst possible~~ thermal ~~isolator~~.~~'''~~		In general the desired dense and stiff gemstone metamaterials have low to horrible thermal isolation performance. Thus they need to be tweaked.
	~~More generally the allotropes of carbon (diamond, lonsdaleite, graphene, nanotubes, fullerenes?) are all pretty bad thermal isolators~~.

	~~Structuring carbon in novel ways may yield acceptable results.~~		= Basics =
	Regular gaps between electrically conductive surfaces can have influence on the allowed modes of electromagnetic (heat) radiation transport. ('''Todo:''' check whether macroscopic structures can be electro-statically levitated in multiple shells whith nano-scale distances in between)

	If the ~~incremental path was taken silicates may me mechanosynthesizable~~ to ~~an AP aerogel like substance~~. ~~<br>~~		Because of the [[scaling laws]] for surface-to-volume-ratio single isolated nanoscale parts would cool of / heat up instantly to average environment temperature. Thus thermal isolation layers makes only sense between macroscopic spaces.
	~~A lack of material stiffness may pose problems~~.

	The stiff structures desirable for AP systems somewhat contradict low thermal conductance		For thermal isolation one has to suppress:
	since ~~they~~ usually lead to a high phononic (lattice vibration) contribution to thermal conductance.		* convection (this is easy in advanced APM systems "filled" with practically perfect vacuum)
			* phononic and electronic heat transport
			* radiative heat transport

			= Material influence on phononic and electronic heat transport =

			The stiff high density structures usually desirable for advanced AP systems somewhat contradict low thermal conductance since these materials usually lead to a high phononic (lattice vibration) contribution to thermal conductance.
	Electronic contributions can be kept low more easily.		Electronic contributions can be kept low more easily.

	~~Because~~ of the [[~~scaling laws~~]] ~~for surface-~~to~~-volume-ratio single isolated nanoscale parts would cool~~ of ~~/ heat up instantly to average environment temperature~~.		== Carbon based ==
	~~Thus Thermal~~ isolation ~~makes only sense in makroscopically divided spaces~~.
			When one restricts oneself to pure hydrocarbon systems it gets even worse.
			The common allotropes of carbon (diamond, lonsdaleite, graphene, nanotubes, fullerenes?) are all pretty bad thermal isolators.
			'''Diamond is one of the worst possible thermal isolators in existence.'''
			Structuring carbon in novel ways (parse and non-stiff) may yield acceptable results.

			== With silicon and other elements ==

			If advanced APM will be reached through the [[incremental path]] it's likely that silicates will be mechanosynthesizable to an atomically precise break resistant aerogel like substance. Usually one can increase thermal isolation by making the structure more sparse introducing vacuum chambers.
			For very sparse structures:
			* the lack of material stiffness may pose problems in assembly.
			* high forces e.g. by external air pressure and mass loads could temporarily squish the material thereby drastically reducing the thermal isolation level.

			= Radiative heat transport =

	~~['''Todo:''' Check out which effect~~ the ~~use~~ of ~~[[tensegrity]]~~ structures ~~has on thermal isolation.]~~		Regular gaps between electrically conductive surfaces can have influence on the allowed modes of electromagnetic (heat) radiation transport.<br>
			{{todo\| check whether macroscopic structures can be electro-statically levitated in multiple shells whith nano-scale distances in between}}

			= Semi concrete implementation proposals =

	{{Template:Site specific definition}}		{{Template:Site specific definition}}
Line 43:		Line 61:
	A slightly different method would be the use of highly heat conductive coplanar sheets that can be separated or brought in (interlocking) contact with some kind of barely heat conducting scissoring mechanism. This Metamaterial would change its volume when it changes its heat conductivity. Also if it increases it's volume in an atmosphere its pulling up a vacuum thus quite a bit of energy needs to be put in. When the volume gets decreased the energy can get recuperated. Although it works with air pressure nothing of the energy that is put in will be converted to a temperature difference like in [[entropomechanical converters]] since the outer pressure stays constant.		A slightly different method would be the use of highly heat conductive coplanar sheets that can be separated or brought in (interlocking) contact with some kind of barely heat conducting scissoring mechanism. This Metamaterial would change its volume when it changes its heat conductivity. Also if it increases it's volume in an atmosphere its pulling up a vacuum thus quite a bit of energy needs to be put in. When the volume gets decreased the energy can get recuperated. Although it works with air pressure nothing of the energy that is put in will be converted to a temperature difference like in [[entropomechanical converters]] since the outer pressure stays constant.

	== Related ==		= Notes =

			{{todo\|Check out which effect the use of [[tensegrity]] structures has on thermal isolation.}}

			= Related =

	* [[Diamondoid metamaterials]]		* [[Diamondoid metamaterials]]

Apm: /* Thermal conduction adjustment µ-components / switched png graphic to svg - new image description - (remove .png file to save memory?)

2016-02-13T06:45:34Z

Thermal conduction adjustment µ-components: switched png graphic to svg - new image description - (remove *.png file to save memory?)

← Older revision		Revision as of 08:45, 13 February 2016
Line 23:		Line 23:
	== Thermal conduction adjustment µ-components ==		== Thermal conduction adjustment µ-components ==

	[[File:HeatFlowControlCell2.~~png~~\|600px\|thumb\|right\|~~'''graphic is available~~ in ~~lossless *.svg format [http://apm~~.~~bplaced.net/w/index.php?title=File:HeatFlowControlCell2.svg here]'''~~]]		[[File:HeatFlowControlCell2.svg\|600px\|thumb\|right\| Turning the diamond rotor in one of the two configurations makes either a near thermal short circuit or a near thermal disconnect.]]

	A [[diamondoid metamaterial\|metamaterial]] for practically instant adjustment of thermal conduction can be made from components that are optimized for thermal isolation but can be actuated such that a stiff diamond bridge is made that creates a thermal short circuit. Such materials would be perfect for [[AP suit\|advanced atomically precise produced clothing]].		A [[diamondoid metamaterial\|metamaterial]] for practically instant adjustment of thermal conduction can be made from components that are optimized for thermal isolation but can be actuated such that a stiff diamond bridge is made that creates a thermal short circuit. Such materials would be perfect for [[AP suit\|advanced atomically precise produced clothing]].

Apm at 07:09, 2 October 2015

2015-10-02T07:09:44Z

← Older revision		Revision as of 09:09, 2 October 2015
Line 43:		Line 43:
	A slightly different method would be the use of highly heat conductive coplanar sheets that can be separated or brought in (interlocking) contact with some kind of barely heat conducting scissoring mechanism. This Metamaterial would change its volume when it changes its heat conductivity. Also if it increases it's volume in an atmosphere its pulling up a vacuum thus quite a bit of energy needs to be put in. When the volume gets decreased the energy can get recuperated. Although it works with air pressure nothing of the energy that is put in will be converted to a temperature difference like in [[entropomechanical converters]] since the outer pressure stays constant.		A slightly different method would be the use of highly heat conductive coplanar sheets that can be separated or brought in (interlocking) contact with some kind of barely heat conducting scissoring mechanism. This Metamaterial would change its volume when it changes its heat conductivity. Also if it increases it's volume in an atmosphere its pulling up a vacuum thus quite a bit of energy needs to be put in. When the volume gets decreased the energy can get recuperated. Although it works with air pressure nothing of the energy that is put in will be converted to a temperature difference like in [[entropomechanical converters]] since the outer pressure stays constant.

	== ~~Relared~~ ==		== Related ==

	* [[Diamondoid metamaterials]]		* [[Diamondoid metamaterials]]

Apm at 07:09, 2 October 2015

2015-10-02T07:09:22Z

← Older revision		Revision as of 09:09, 2 October 2015
Line 42:		Line 42:

	A slightly different method would be the use of highly heat conductive coplanar sheets that can be separated or brought in (interlocking) contact with some kind of barely heat conducting scissoring mechanism. This Metamaterial would change its volume when it changes its heat conductivity. Also if it increases it's volume in an atmosphere its pulling up a vacuum thus quite a bit of energy needs to be put in. When the volume gets decreased the energy can get recuperated. Although it works with air pressure nothing of the energy that is put in will be converted to a temperature difference like in [[entropomechanical converters]] since the outer pressure stays constant.		A slightly different method would be the use of highly heat conductive coplanar sheets that can be separated or brought in (interlocking) contact with some kind of barely heat conducting scissoring mechanism. This Metamaterial would change its volume when it changes its heat conductivity. Also if it increases it's volume in an atmosphere its pulling up a vacuum thus quite a bit of energy needs to be put in. When the volume gets decreased the energy can get recuperated. Although it works with air pressure nothing of the energy that is put in will be converted to a temperature difference like in [[entropomechanical converters]] since the outer pressure stays constant.

			== Relared ==

			* [[Diamondoid metamaterials]]

Thermal isolation - Revision history

Apm: /* Basics */

Apm: updated intro

Apm: /* Related */ added two links * Diamondoid heat pump systems * Gem-gum solid state heat pipes

Apm: /* Related */ added Thermal metamaterials

Apm: reordered categories - thermal first

Apm: Category:Thermal

Apm: new intro; major cleanup

Apm: /* Thermal conduction adjustment µ-components */ switched png graphic to svg - new image description - (remove *.png file to save memory?)

Apm at 07:09, 2 October 2015

Apm at 07:09, 2 October 2015

Apm: /* Related / added two links Diamondoid heat pump systems * Gem-gum solid state heat pipes

Apm: /* Thermal conduction adjustment µ-components / switched png graphic to svg - new image description - (remove .png file to save memory?)