Vacuum Cooling
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Dalek Dave wrote:
Temperature has nothing to do with heat!
Indeed. It's often more intuitive to explain temperature as 'heat density'. Of course it's more complex than that, but the concept is helpful.
-Sean ---- Fire Nuts
Until you get to something like spin temperature where temperature can actually decrease as you increase temperature and you can reach negative temperatures. It's actually a measure of change of randomness or entropy over change in energy, which for most objects is proportional to energy. Ha!
I can imagine the sinking feeling one would have after ordering my book, only to find a laughably ridiculous theory with demented logic once the book arrives - Mark McCutcheon
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Rob Graham wrote:
Temperature is to heat as voltage is to current..
Not quite. Temperature is the average kinetic energy of the molecules in a substance. Voltage is the potential energy per unit charge. I think it would be a more appropriate comparison to say: Temperature is to heat as current density (J) is to current (I).
-Sean ---- Fire Nuts
Not sure I agree - see this discussion[^].
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That made me wonder what would happen to water in space. Seems this (article with video at bottom) would happen. Now, any guess as to what would happen to a block of ice in space? My guess is it would stay a block of ice. This stuff is neat! I hope to one day get back to school and learn more physics. :)
block of ice in space I think that's called a comet :confused:
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I've seen computers cooled with fans (airflow), tubes (water cooling), and fully submerged in oil (oil cooling), but I've never heard of a computer kept in a perfect vacuum (well, aside from those vacuum tube things that only the wisest of CPians remember). For all you pysicists, would keeping a computer in a vacuum at room temperature help cool it at all? Or would it perhaps cause it to overheat? Neither? For your reference, here is an "artist's" rendition of such a vacuum sealed computer:
+------------------------+
|\ /|
| \ / |
| \ / |
| \ / |
| \ / |
| +============+ |
| | | |
| | | | <--- Outer glass case contains no air.
| | | |
| | Computer | |
| | | |
| | | |
| +============+ |
| / \ |
| / \<--+-- Strings to suspend computer in outer case.
| / \ |
| / \ |
|/ \|
+------------------------+Personally, I'd love to see Doppler Cooling[^]. I have a neighbor with a bird house and me and those birds have a reckoning coming.
And above all things, never think that you're not good enough yourself. A man should never think that. My belief is that in life people will take you at your own reckoning. --Isaac Asimov Avoid the crowd. Do your own thinking independently. Be the chess player, not the chess piece. --Ralph Charell
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Personally, I'd love to see Doppler Cooling[^]. I have a neighbor with a bird house and me and those birds have a reckoning coming.
And above all things, never think that you're not good enough yourself. A man should never think that. My belief is that in life people will take you at your own reckoning. --Isaac Asimov Avoid the crowd. Do your own thinking independently. Be the chess player, not the chess piece. --Ralph Charell
Chris Austin wrote:
Personally, I'd love to see Doppler Cooling[^].
An evaporation cooler is 'better' and a lot easier to make.
xacc.ide
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Chris Austin wrote:
Personally, I'd love to see Doppler Cooling[^].
An evaporation cooler is 'better' and a lot easier to make.
xacc.ide
IronScheme - 1.0 RC 1 - out now!
((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth Editionleppie wrote:
An evaporation cooler is 'better' and a lot easier to make.
But I want a LASER!!! :)
And above all things, never think that you're not good enough yourself. A man should never think that. My belief is that in life people will take you at your own reckoning. --Isaac Asimov Avoid the crowd. Do your own thinking independently. Be the chess player, not the chess piece. --Ralph Charell
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block of ice in space I think that's called a comet :confused:
Steve _________________ I C(++) therefore I am
Haha, true enough.
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Temperature has nothing to do with heat! A bath of water at 1 degree C has way more heat that a cup of boiling water. Actually boiling at near absolute zero is EXACTLY what happens! Go to the top of Everest and water boils at 70C.
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
Dalek Dave wrote:
Actually boiling at near absolute zero is EXACTLY what happens!
??? Freezing, Shirley? It's reducing pressure that lowers the desublimation temperature -- lack of heat can't change a boiling point; that would be dorapaxical.
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Dalek Dave wrote:
Go to the top of Everest and water boils at 70C.
No thanks, I'd rather boil water at 100C and have my tea here. :)
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Luc Pattyn wrote:
No thanks, I'd rather boil water at 100C and have my tea here.
You know that's not true, don't you? You can make tea with room-temperature water. God knows where the "must be boiling" tripe came from.
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There is also induction.
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
Dalek Dave wrote:
There is also induction.
CONduction. Induction is the transference of electromotive force through magnetism. Heat transfers by CCR: - Convection - Conduction - Radiation
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cooling happens by convection (transfer of heat from one material to another). so... in a vacuum, no heat would transfer or convect since there would be nothing to absorb the heat. hence... the computer would soon meltdown. it would be better to have some sort of superconducting heat convecting "diode"-like device (perfect convection with no resistance in one direction) attached to the computer's components. ==== actually in your diagram, heat would move along the strings
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http://obamacaretruth.org/ahmed zahmed wrote:
convection (transfer of heat from one material to another).
That's conduction. Convection needs a fluid.
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Dalek Dave wrote:
There is also induction.
CONduction. Induction is the transference of electromotive force through magnetism. Heat transfers by CCR: - Convection - Conduction - Radiation
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Heat can be transfered by induction. Use thermocouplers to create electric current, transfer the current via induction, the energy is then removed from the system via induction. Next?
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
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Heat can be transfered by induction. Use thermocouplers to create electric current, transfer the current via induction, the energy is then removed from the system via induction. Next?
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
Dalek Dave wrote:
transfer the current via induction
Um... You might want to rethink your statement.
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Heat can be transfered by induction. Use thermocouplers to create electric current, transfer the current via induction, the energy is then removed from the system via induction. Next?
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
Actually, thinking on it, you might induce someone to turn the fire on, so I suppose that counts.
I wanna be a eunuchs developer! Pass me a bread knife!
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I've seen computers cooled with fans (airflow), tubes (water cooling), and fully submerged in oil (oil cooling), but I've never heard of a computer kept in a perfect vacuum (well, aside from those vacuum tube things that only the wisest of CPians remember). For all you pysicists, would keeping a computer in a vacuum at room temperature help cool it at all? Or would it perhaps cause it to overheat? Neither? For your reference, here is an "artist's" rendition of such a vacuum sealed computer:
+------------------------+
|\ /|
| \ / |
| \ / |
| \ / |
| \ / |
| +============+ |
| | | |
| | | | <--- Outer glass case contains no air.
| | | |
| | Computer | |
| | | |
| | | |
| +============+ |
| / \ |
| / \<--+-- Strings to suspend computer in outer case.
| / \ |
| / \ |
|/ \|
+------------------------+aspdotnetdev wrote:
would keeping a computer in a vacuum at room temperature help cool it at all
It would cause it to heat up. A lot. In fact it wold probably BSOD with that very rare BSOD error to do with overheating that I can never remember. Either that or catch fire. Especially if its a laptop.
Morality is indistinguishable from social proscription
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Dalek Dave wrote:
Simple thermodynamics
Oxymoron? I kid, that does make sense... I wasn't quite sure how heat transfers in a vacuum. Would the same thing happen in space, where I hear the temperature is quite cold (near absolute zero)? It would be awfully ironic to boil in an absolute zero environment.
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Double glazing. Think about it.
Join the cool kids - Come fold with us[^]
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ahmed zahmed wrote:
convection (transfer of heat from one material to another).
That's conduction. Convection needs a fluid.
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Dont misquote him to make yourself look clever. He wrote: "cooling happens by convection (transfer of heat from one material to another)." Which is true.
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fat_boy wrote:
Dont misquote him to make yourself look clever. He wrote: "cooling happens by convection (transfer of heat from one material to another)." Which is true.
I'm afraid it's not true, but it's an excusable mistake, of the kind that I myself would be happy to receive a correction on (so that I'll know better in future). Convection is the transfer of heat through a fluid. That is quite different from "transfer of heat from one material to another", which is called conduction. The differences are obvious, so the reason for the distinction in terms is equally obvious. It might be an idea to study Physics a little before making such comments, because that's not an excusable mistake. That you don't know even the very basics about heat and heat transference explains a lot about your opinions on GW.
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fat_boy wrote:
Dont misquote him to make yourself look clever. He wrote: "cooling happens by convection (transfer of heat from one material to another)." Which is true.
I'm afraid it's not true, but it's an excusable mistake, of the kind that I myself would be happy to receive a correction on (so that I'll know better in future). Convection is the transfer of heat through a fluid. That is quite different from "transfer of heat from one material to another", which is called conduction. The differences are obvious, so the reason for the distinction in terms is equally obvious. It might be an idea to study Physics a little before making such comments, because that's not an excusable mistake. That you don't know even the very basics about heat and heat transference explains a lot about your opinions on GW.
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