Spaceflight with gem-gum-tec - Revision history

Apm: moved most of content over to page Cooling by heating

2017-09-04T06:15:35Z

moved most of content over to page Cooling by heating

@@ Line 4: / Line 4: @@
 * better materials
 * further miniaturization
 == Related ==

Apm: /* Related */ added link to planned content swap destination page Cooling by heating

2017-09-04T06:13:44Z

Related: added link to planned content swap destination page Cooling by heating

← Older revision		Revision as of 08:13, 4 September 2017
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	* [[Space elevator]]		* [[Space elevator]]
	* [[Carriage particle accelerators]]		* [[Carriage particle accelerators]]
			* One might be able to cool spacecraft by heating their radiators. See: [[Cooling by heating]]
	----		----
	* [[Colonization of the solar system]]		* [[Colonization of the solar system]]

Apm: /* Related */ added to related links

2017-08-14T18:00:36Z

Related: added to related links

← Older revision		Revision as of 20:00, 14 August 2017
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	== Related ==		== Related ==

			* [[Space debris]]
	* [[Rocket engines and AP technology]]		* [[Rocket engines and AP technology]]
			* [[Space elevator]]
	* [[Carriage particle accelerators]]		* [[Carriage particle accelerators]]
	----		----

Apm: /* External links */

2017-08-14T17:55:45Z

External links

← Older revision		Revision as of 19:55, 14 August 2017
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	* Wikipedia: [https://en.wikipedia.org/wiki/Orbital_spaceflight Orbital launch]		* Wikipedia: [https://en.wikipedia.org/wiki/Orbital_spaceflight Orbital launch]
			* Heat pumps in space: [https://www.google.at/search?q=heat+pump+space+radiator&oq=heat+pump+space+radiator&aqs=chrome..69i57.7228j0j8&client=ubuntu&sourceid=chrome&ie=UTF-8 googlesearch]

Apm: /* Cooling a spacecraft by heating its radiators */ link to Wikipedia page: Stefan–Boltzmann law

2017-08-09T18:13:30Z

Cooling a spacecraft by heating its radiators: link to Wikipedia page: Stefan–Boltzmann law

← Older revision		Revision as of 20:13, 9 August 2017
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	When the temperature of the radiators is kept constant then doubling the cooling power equates to doubling the area of the radiatiors. This furthermore roughly doubles the radiators mass (ignoring the mass of eventual fractal stiffening structures).		When the temperature of the radiators is kept constant then doubling the cooling power equates to doubling the area of the radiatiors. This furthermore roughly doubles the radiators mass (ignoring the mass of eventual fractal stiffening structures).

	Since the radiated away power per unit area '''(areal cooling power density) scales with the fourth power of the radiators temperature''' (Stefan–Boltzmann law) one can radiate away much more waste heat when the radiators are operated at a high temperature.		Since the radiated away power per unit area '''(areal cooling power density) scales with the fourth power of the radiators temperature''' (Stefan–Boltzmann law [https://en.wikipedia.org/wiki/Stefan%E2%80%93Boltzmann_law]) one can radiate away much more waste heat when the radiators are operated at a high temperature.

	While possible today {{todo\|check inhowfar that has been done}}<br>		While possible today {{todo\|check inhowfar that has been done}}<br>

Apm: /* Enabling magma submarines ?! */ note that not the plasma ones are meant here

2017-08-09T15:53:07Z

Enabling magma submarines ?!: note that not the plasma ones are meant here

← Older revision		Revision as of 17:53, 9 August 2017
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	{{speculativity warning}} (level 3)		{{speculativity warning}} (level 3)

	In case earth core probes turn out to be possible than the method of cooling by heating radiators is of absolute essence. An unconditional requirement.<br>		In case earth core probes turn out to be possible than the method of cooling by heating (solid state) radiators is of absolute essence. An unconditional requirement.<br>
	See main article "[[Deep drilling]]" for more speculations regarding this topic.		See main article "[[Deep drilling]]" for more speculations regarding this topic.

Apm: headline hierarchy

2017-08-09T15:52:01Z

headline hierarchy

← Older revision		Revision as of 17:52, 9 August 2017
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	In general this is about averting the "hypsithermal limit" and thus even applicable to earth.		In general this is about averting the "hypsithermal limit" and thus even applicable to earth.

	== Enabling magma submarines ?! ==		=== Enabling magma submarines ?! ===

	{{speculativity warning}} (level 3)		{{speculativity warning}} (level 3)

Apm: /* Grazing the sun – A "mundane" form of star lifting */ extreme orbital speeds & atmospheric drag

2017-08-09T15:23:30Z

Grazing the sun – A "mundane" form of star lifting: extreme orbital speeds & atmospheric drag

← Older revision		Revision as of 17:23, 9 August 2017
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	{{speculativity warning}} (level 3)		{{speculativity warning}} (level 3)

	With this method: Could spacecrafts be sent near enough to the sun to replenish their released "cooling-plasma" (up to 200,000,000 K) with plasma from the suns atmosphere which is freezing cold in comparison (corona: 1,000,000 K)? This would likely mean dipping a bit into the (colder but denser) chromosphere.		With this method: Could spacecrafts be sent near enough to the sun to replenish their released "cooling-plasma" (up to 200,000,000 K) with plasma from the suns atmosphere which is freezing cold in comparison (corona: 1,000,000 K)? This would likely mean dipping a bit into the (colder but denser) chromosphere (transition region).

	Problems:		Problems:
	* it may be hard to shield against deeply penetrating hard radiation spectral tails (X-ray to gamma)		* it may be hard to shield against deeply penetrating hard radiation spectral tails (X-ray to gamma)
	* corona temperatures > 1,000,000 K (very low density though!)		* temperatures & densities: <br>corona temperatures > 1,000,000 K (very low density though!) <br>lower lying chromosphere: while temperatures are lower pressures are higher (effectively a higher thermal load?)
	* lower lying chromosphere: while temperatures are lower pressures are higher (effectively a higher thermal load?)
	* at scooping depth atmospheric drag compensation likely becomes an issue		* at scooping depth atmospheric drag compensation likely becomes an issue
			* extreme orbital speeds in periapsis significantly bigger than 100km/s<br> {{todo\|check exact speeds and which temperature these corresponds to - these add to the environmental conditions}}<br> note that extreme orbital speeds make scooping more efficient – crossing more volume per time
	* likely negligible: interaction of magnetic systems of the spacecraft with suns magnetic field		* likely negligible: interaction of magnetic systems of the spacecraft with suns magnetic field

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	Here's a density vs heigth chart for the Earth's atmosphere:		Here's a density vs heigth chart for the Earth's atmosphere:
	[https://commons.wikimedia.org/wiki/File:Atmosphere_model.png]<br>		[https://commons.wikimedia.org/wiki/File:Atmosphere_model.png]<br>
	80km ~ 2ng/ccm = 2mg/m³ ~ one orbit around earth => way too dense \|\| 150km ~ 0.3pg/ccm = 0.3µg/m³ \|\| 200km ~ orbiting earth about 24hours (about 16 orbits)		80km ~ 2ng/ccm = 2mg/m³ ~ one orbit around earth => way too dense \|\| 150km ~ 0.3pg/ccm = 0.3µg/m³ \|\| 200km ~ orbiting earth about 24hours (about 16 orbits)<br>
			Since the sun is much bigger and massive than Earth one contacts much faster at much longer distance thus one will want to avoid dipping in as deep as in earths atmosphere.

			{{todo\|compare to galileo entry probe reentry conditions}}

	=== Cooling whole Planets ===		=== Cooling whole Planets ===

Apm: /* Grazing the sun – A "mundane" form of star lifting */ links regarding sun-dip

2017-08-09T15:01:28Z

Grazing the sun – A "mundane" form of star lifting: links regarding sun-dip

← Older revision		Revision as of 17:01, 9 August 2017
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	=== Grazing the sun – A "mundane" form of star lifting ===		=== Grazing the sun – A "mundane" form of star lifting ===

	{{speculativity warning}} (level 2)		{{speculativity warning}} (level 3)

	With this method: Could spacecrafts be sent near enough to the sun to replenish their released "cooling-plasma" (up to 200,000,000 K) with plasma from the suns atmosphere which is freezing cold in comparison (corona: 1,000,000 K)?		With this method: Could spacecrafts be sent near enough to the sun to replenish their released "cooling-plasma" (up to 200,000,000 K) with plasma from the suns atmosphere which is freezing cold in comparison (corona: 1,000,000 K)? This would likely mean dipping a bit into the (colder but denser) chromosphere.

	Problems:		Problems:
	* hard to shield against deeply penetrating hard radiation (X-ray to gamma)		* it may be hard to shield against deeply penetrating hard radiation spectral tails (X-ray to gamma)
	* corona temperatures > 1,000,000 K (low density though!)		* corona temperatures > 1,000,000 K (very low density though!)
			* lower lying chromosphere: while temperatures are lower pressures are higher (effectively a higher thermal load?)
			* at scooping depth atmospheric drag compensation likely becomes an issue
			* likely negligible: interaction of magnetic systems of the spacecraft with suns magnetic field

			Here's a density vs temperature chart of the Sun's atmosphere: [https://commons.wikimedia.org/wiki/File:Sun_Atmosphere_Temperature_and_Density_SkyLab.jpg] associated infos: [https://en.wikipedia.org/wiki/File_talk:Sun_Atmosphere_Temperature_and_Density_SkyLab.jpg]<br>
			Here's a density vs heigth chart for the Earth's atmosphere:
			[https://commons.wikimedia.org/wiki/File:Atmosphere_model.png]<br>
			80km ~ 2ng/ccm = 2mg/m³ ~ one orbit around earth => way too dense \|\| 150km ~ 0.3pg/ccm = 0.3µg/m³ \|\| 200km ~ orbiting earth about 24hours (about 16 orbits)

	=== Cooling whole Planets ===		=== Cooling whole Planets ===

Apm: added lots of ideas regarding cooling by heating

2017-08-09T14:31:00Z

added lots of ideas regarding cooling by heating

@@ Line 4: / Line 4: @@
 * better materials
 * further miniaturization
 == Related ==