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Different Liquid nitrogen cooling methods - Page 2

post #11 of 22
Quote:
Originally Posted by Witchdoctor View Post
Ahhh

I am speechless ..............
First time for everything JK bro
Quote:
Originally Posted by ragwafire View Post
i have heard of the typical use for liquid nitrogen for computer cooling, and i find it wasteful. any thoughts on this?
Wateful? Like people who ride roller coasters, they know it's not going to stop and it only comes right back to the spot that they started. Like that wastefull? Or like joining a forum to post once and not respond back like wastefull?
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post #12 of 22
It's not wasteful because its cheaper to get new than try to return it to its former state.
    
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post #13 of 22
Quote:
Originally Posted by Atomfix View Post
Hop on a shuttle, go into space, and you will need no MB, CPU or GPU heatsinks
Out of curiosity, if you went into space with a PC, would it get cooled? If space is a complete vacuum, then wouldn't heat not get transferred? Heat is generated by excited particles, and if there's no particles to excite, then heat would not transfer?
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post #14 of 22
Quote:
Originally Posted by bfeng91 View Post
Out of curiosity, if you went into space with a PC, would it get cooled? If space is a complete vacuum, then wouldn't heat not get transferred? Heat is generated by excited particles, and if there's no particles to excite, then heat would not transfer?
Space is not a complete vacuum, just close to it. I don't have any of the science offhand, but the components on the ISS and space shuttles still need cooling in some shape or form, and the ISS uses ammonia(phase change liquid) to cool it's components. I think the use ammonia it's due to the low pressures need to condense the gas back to a liquid after the phase change. What they do with the heat afterwards, I have no idea. Space is something like -200c (partially due to the vacuum, lack of materials to absorb the heat from the closest star (I think).

Remember, "Coldness" is the LACK of heat.
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post #15 of 22
Quote:
Originally Posted by Nocturin View Post
Space is not a complete vacuum, just close to it. I don't have any of the science offhand, but the components on the ISS and space shuttles still need cooling in some shape or form, and the ISS uses ammonia(phase change liquid) to cool it's components. I think the use ammonia it's due to the low pressures need to condense the gas back to a liquid after the phase change. What they do with the heat afterwards, I have no idea. Space is something like -200c (partially due to the vacuum, lack of materials to absorb the heat from the closest star (I think).

Remember, "Coldness" is the LACK of heat.
Well yes, it may not be a perfect vacuum, but there's still very few particles to take heat away from the components. Air cooling works as the heat is transferred from the heatsink to the air. In space, there isn't anything to pass over the heatsink or chip itself to cool it down.
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post #16 of 22
Quote:
Originally Posted by thrasherht View Post
LN2 only gets cold because it is decompressing and going from a liquid to a gas, so if you stop that from happening, it would prevent the LN2 from becoming cold.
in theory, couldnt you have a system that takes LN2 and takes the evaporated vapors, recools them, then send the LN2 back into the PCU block/pot
post #17 of 22
Quote:
Originally Posted by noak View Post
in theory, couldnt you have a system that takes LN2 and takes the evaporated vapors, recools them, then send the LN2 back into the PCU block/pot
I think someone already addressed this point. The pressures that it would take for the N2 vapors to cool and become liquid again would be unrealistic, as well as the temperatures (-147c?).
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post #18 of 22
itd blow up, unless you found a way to deal with the 700:1 gas to liquid ratio. So good luck with that idea lol. that huge ratio is why LN2 gets so cold, becuase it has to use that much more heat from the surroundings to expand and its molecules gain energy, it literally removes the heat when it expands. Reduce the amount it can expand, or its total thermal capacity in moles, and well it wont work.
Edited by Sin0822 - 7/27/11 at 9:08pm
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post #19 of 22
Quote:
Originally Posted by bfeng91 View Post
Well yes, it may not be a perfect vacuum, but there's still very few particles to take heat away from the components. Air cooling works as the heat is transferred from the heatsink to the air. In space, there isn't anything to pass over the heatsink or chip itself to cool it down.
Quote, " Waste heat is removed in two ways, through cold plates and heat exchangers, both of which are cooled by a circulating water loop. Air and water heat exchangers cool and dehumidify the spacecraft's internal atmosphere. High heat generators are attached to custom-built cold plates. Cold water -- circulated by a 17,000-rpm impeller the size of a quarter -- courses through these heat-exchanging devices to cool the equipment.
"The excess heat is removed by this very efficient liquid heat-exchange system," said Ungar. "Then we send the energy to radiators to reject that heat into space."

Source

I guess there is still enough particles in space for convection to take place. Maybe the extreme temps temps in space helps overcome the lack of matter to pass heat.
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post #20 of 22
Quote:
Originally Posted by Sin0822 View Post
itd blow up, unless you found a way to deal with the 700:1 gas to liquid ratio. So good luck with that idea lol. that huge ratio is why LN2 gets so cold, becuase it has to use that much more heat from the surroundings to expand and its molecules gain energy, it literally removes the heat when it expands. Reduce the amount it can expand, or its total thermal capacity in moles, and well it wont work.
Nitrogen no matter what pressure cannot become a liquid unless it is -147c. You need to have a cold side of another refrigeration loop on the hot side of the nitrogen loop.

This is what a cascade cooler is.
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