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Submerged mineral oil PC - but EE what would say on it? Finally...

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TerraHertz:

--- Quote from: Assafl on February 16, 2017, 09:47:52 am ---The comparisons seem to ignore the real breakthrough in CPU cooling which is heat pipes.

Since those use the latent energy of water their ability to move heat is only bettered by a powered heat pump (A/C). And even the unpowered heat pipes can be bettered by using a lower flash point liquid like ammonia (like absorption refrigerators) - which fortunately is not even necessary.

When applied properly a decent heat pipe can take a 70C CPU and drop it to Under 40C. That is some massive Wattage...

Even water systems don't come close. 4.184 Joules/degree C/gram. Yuck.
Compare that with the latent heat of vaporization of water - 2257 Joules / Gram.....

--- End quote ---

Heat pipes don't use water for the evaporative fluid. If they did, they wouldn't work below 100 deg C.
But yes, heat pipes are cool. Btw, easy to buy too:
  https://www.aliexpress.com/item/DIY-laptop-notebook-brass-cooler-heat-exchanger-tube-fins-efficient-copper-pipe-80mm-300mm-Thermal-conductivity/32291675053.html
Some interesting heat-pipe-hack photos there.

Anyway...

Everyone is forgetting the very great advantage of mineral oil cooled PCs.
When there's a power failure, you can stick a wick in it and use it as a lamp.

CatalinaWOW:

--- Quote from: TerraHertz on February 16, 2017, 12:33:42 pm ---
Everyone is forgetting the very great advantage of mineral oil cooled PCs.
When there's a power failure, you can stick a wick in it and use it as a lamp.

--- End quote ---

Now THERE you have hit on a real advantage.  Days of emergency lighting and a bit of heat for those in cold climates.

Bud:

--- Quote from: james_s on February 16, 2017, 01:12:01 am ---I have no interest in dunking my PC in liquid nitrogen to try to push it briefly to crazy speeds but to each their own.

--- End quote ---

That may be so until you get interested in quantum computers
 ;D

james_s:

--- Quote from: TerraHertz on February 16, 2017, 12:33:42 pm ---Heat pipes don't use water for the evaporative fluid. If they did, they wouldn't work below 100 deg C.
But yes, heat pipes are cool. Btw, easy to buy too:
  https://www.aliexpress.com/item/DIY-laptop-notebook-brass-cooler-heat-exchanger-tube-fins-efficient-copper-pipe-80mm-300mm-Thermal-conductivity/32291675053.html
Some interesting heat-pipe-hack photos there.


--- End quote ---

It's possible to build a heat pipe using water that works well below 100C, they have the air evacuated and run at a lower pressure. Water will boil at room temperature in a vacuum.

Berni:

--- Quote from: TerraHertz on February 16, 2017, 12:33:42 pm ---Heat pipes don't use water for the evaporative fluid. If they did, they wouldn't work below 100 deg C.
But yes, heat pipes are cool. Btw, easy to buy too:
  https://www.aliexpress.com/item/DIY-laptop-notebook-brass-cooler-heat-exchanger-tube-fins-efficient-copper-pipe-80mm-300mm-Thermal-conductivity/32291675053.html
Some interesting heat-pipe-hack photos there.

--- End quote ---

You can use water for heatpipes if you reduce the pressure inside to make water boil at room temperature.

Indeed heat pipes are used a lot for cooling PCs but it still does not work as well as watercooling. While yes changing the phase of water requires a lot of energy but the heatpipes move around very little liquid inside them because they have to use the wicking action of the internal structures to move fluid around. As opposed to watercooling where you have a pump pushing a large volume of fluid trough so quickly it heats up by only a few degrees by the time it comes back out the other side.

Heatpipes do have a big upside tho. They are very reliable and maintenance free since there are basically zero moving parts.

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