Heat Management - Revision history

Lwcamp at 19:01, 7 March 2026

2026-03-07T19:01:42Z

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	Authors: Qalqulserut, Rocketman1999		Authors: Qalqulserut, Rocketman1999

	[[Category:Physics & Engineering]] [[Category:Transportation & Infrastructure]][[Category:Engineering]]		[[Category:Physics & Engineering]][[Category:Physics & Math & Engineering]][[Category:Transportation & Infrastructure]][[Category:Engineering]]

Tshhmon at 21:35, 23 April 2024

2024-04-23T21:35:07Z

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	Authors: Qalqulserut, Rocketman1999		Authors: Qalqulserut, Rocketman1999

	[[Category:Physics ~~& Math~~ & Engineering]] [[Category:~~Spacecraft~~ & Infrastructure]]		[[Category:Physics & Engineering]] [[Category:Transportation & Infrastructure]][[Category:Engineering]]

Tshhmon at 18:42, 1 April 2024

2024-04-01T18:42:09Z

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	Still, it is possible to make use of evaporative cooling even there, through indirect cycles. The best working fluid for evaporative coolers is water, as it has an incredibly high enthalpy of vaporization (see the section on phase transitions for that).		Still, it is possible to make use of evaporative cooling even there, through indirect cycles. The best working fluid for evaporative coolers is water, as it has an incredibly high enthalpy of vaporization (see the section on phase transitions for that).
	==In vacuum==		==In space/vacuum==
	~~Outer space, baby!~~

	Only two out of the four ways of heat transfer are present in vacuum: radiation, and advection. This is because vacuum is literally the lack of material - and without such to serve as a medium in which to conduct heat, both conduction and convection are not possible at all.		Only two out of the four ways of heat transfer are present in vacuum: radiation, and advection. This is because vacuum is literally the lack of material - and without such to serve as a medium in which to conduct heat, both conduction and convection are not possible at all.

Tshhmon at 20:42, 15 March 2024

2024-03-15T20:42:51Z

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	E.g. the ocean, or the atmosphere.		E.g. the ocean, or the atmosphere.
	===Convective cooling===		===Convective cooling===
	Convective cooling makes use of aritifically induced (forced) convection as the primary form of heat transport. The easiest and most common way of doing this in any fluid is through pumps, or propellers.		Convective cooling makes use of aritifically induced (forced) convection as the primary form of heat transport. The easiest and most common way of doing this in any fluid is through pumps, or propellers. If your use-case is sufficiently mass and space insensitive, you can take advantage of a body's gravitational gradient to build a cooling tower -- commonly associated with power stations.

	===Evaporative cooling===		===Evaporative cooling===
	Evaporative cooling makes use of a fluid's enthalpy of vaporization (roughly, the amount of heat energy needed to vaporize some unit of fluid). This can be significantly more energy-efficient than refrigeration. A common example of evaporative cooling in action is human sweat: on average, we reject 2257 kilojoules of heat for every liter of sweat vaporized (at 35 degrees Celsius).		Evaporative cooling makes use of a fluid's enthalpy of vaporization (roughly, the amount of heat energy needed to vaporize some unit of fluid). This can be significantly more energy-efficient than refrigeration. A common example of evaporative cooling in action is human sweat: on average, we reject 2257 kilojoules of heat for every liter of sweat vaporized (at 35 degrees Celsius).

Tshhmon at 11:45, 1 January 2024

2024-01-01T11:45:54Z

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	As mentioned above, open cycle cooling is far more wasteful when it comes to mass than radiators, hence why they're not as common of as a heat rejection system for spacecraft (where again, mass is at a premium). We want to be very efficient with our open cycle cooling. We must squeeze as much heat we can into every kilogram we throw out. It turns out that water once again, is the best kind of working fluid for this: it has a very high specific heat capacity (amount of heat energy needed to raise an unit mass by one degree of temperature). We can also make use of phase transitions (such as its enthalpy of fusion (melting) and enthalpy of vaporization).		As mentioned above, open cycle cooling is far more wasteful when it comes to mass than radiators, hence why they're not as common of as a heat rejection system for spacecraft (where again, mass is at a premium). We want to be very efficient with our open cycle cooling. We must squeeze as much heat we can into every kilogram we throw out. It turns out that water once again, is the best kind of working fluid for this: it has a very high specific heat capacity (amount of heat energy needed to raise an unit mass by one degree of temperature). We can also make use of phase transitions (such as its enthalpy of fusion (melting) and enthalpy of vaporization).

	Open cycle cooling is very attractive for combat spacecraft, where huge radiators are a huge liability. In fact, open cycle cooling reduces the heat rejection apparatus down to a hole, or perhaps a nozzle - where the hot fluid is expelled. No great love lost with shooting mere hot air, unlike classic radiators - where shooting holes can spring leaks and cause all manner of unpleasant damage!		Open cycle cooling is very attractive for combat spacecraft, where huge radiators are a huge liability. In fact, open cycle cooling reduces the heat rejection apparatus down to a hole, or perhaps a nozzle - where the hot fluid is expelled. No great love lost with enemies shooting mere hot air, unlike classic radiators - where shooting holes can spring leaks and cause all manner of unpleasant damage!

	Because of this, combat spacecraft likely make use of a mix of both radiators and open cycle cooling: when they enter combat, they fold in their radiators or however so, and switch to open cycle cooling for the duration of their combat. Likewise, they can also use heat sinks.		Because of this, combat spacecraft likely make use of a mix of both radiators and open cycle cooling: when they enter combat, they fold in their radiators or however so, and switch to open cycle cooling for the duration of their combat. Likewise, they can also use heat sinks.

Tshhmon at 15:21, 11 November 2023

2023-11-11T15:21:51Z

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	=Heat transport=		=Heat transport=
	'''[[Heat]]'''		'''[[Heat\|Heat: Heat Transfer and Temperature]]'''

	==Heat pumps==		==Heat pumps==

Tshhmon at 15:18, 11 November 2023

2023-11-11T15:18:40Z

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	The most famous example of how energy conversion is lossy is [~~https://www.galacticlibrary.net/wiki/Heat_Engines\|~~\| Carnot's ideal heat engine] . From a thermodynamical perspective, the reason that fundamental inefficiencies and waste heat exist, comes down to the impossibility of absolute zero, due to quantum uncertainty. Thanks so much, Heisenberg!		The most famous example of how energy conversion is lossy is [[Heat Engines\|Carnot's ideal heat engine]] . From a thermodynamical perspective, the reason that fundamental inefficiencies and waste heat exist, comes down to the impossibility of absolute zero, due to quantum uncertainty. Thanks so much, Heisenberg!

	=Heat transport=		=Heat transport=

Tshhmon at 15:16, 11 November 2023

2023-11-11T15:16:31Z

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	=Heat transport=		=Heat transport=
	[~~https://www.galacticlibrary.net/wiki/~~Heat~~#Heat_transfer_and_temperature\|Heat: Heat Transfer and Temperature~~]		'''[[Heat]]'''

	==Heat pumps==		==Heat pumps==

Tshhmon at 15:15, 11 November 2023

2023-11-11T15:15:47Z

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 =Heat transport=
-We can't destroy heat, so the only thing left to do is move it from where you don't want it to be. The simplest solution to this problem, is that as heat is here considered to be a property of any object - it stands to reason therefore, we can move the object itself around, to move the heat. In fluids, this process is known as advection.
+[https://www.galacticlibrary.net/wiki/Heat#Heat_transfer_and_temperature|Heat: Heat Transfer and Temperature]
 ==Heat pumps==

Tshhmon at 09:20, 11 November 2023

2023-11-11T09:20:21Z

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	=Heat rejection=		=Heat rejection=
	Heat rejection can refer to the entire system of moving heat around from the heat source to the desired location. In the purview of this article however, we are referring to only the systems that transport heat from a given machine to its surroundings. If a machine has a heat source inside of it, heat rejection can refer to the whole system of coolant lines, heat pumps etc and the final system, e.g. a radiator. For this section, we will be focusing on only these final systems here.		Heat rejection can refer to the entire system of moving heat around from the heat source to the desired location. In the purview of this article however, we are referring to only the systems that transport heat from a given machine to its surroundings. If a machine has a heat source inside of it, heat rejection can refer to the whole system of coolant lines, heat pumps etc and the final system that interfaces with the surroundings, e.g. a radiator. For this section, we will be focusing on only these final, interfacing systems here.

	==In fluids==		==In fluids==