Overclock.net › Forums › Cooling › Cooling Experiments › Alcohol evap?
New Posts  All Forums:Forum Nav:

Alcohol evap? - Page 4

post #31 of 32
Seriously - he brought in actual information instead of vague possibilities derived from what people learned in middle school science.
It goes to eleven
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6300 DS3 EVGA 8600GTS 2GB XMS2 DDR2-800 
Hard DriveOSMonitorKeyboard
1.294 TB Arch Linux/XP Samsung 226bw Eclipse II 
PowerCaseMouse
Corsair 520HX Lian-Li v1000B Plus G7 
  hide details  
Reply
It goes to eleven
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6300 DS3 EVGA 8600GTS 2GB XMS2 DDR2-800 
Hard DriveOSMonitorKeyboard
1.294 TB Arch Linux/XP Samsung 226bw Eclipse II 
PowerCaseMouse
Corsair 520HX Lian-Li v1000B Plus G7 
  hide details  
Reply
post #32 of 32
Ummm, not really. Well, I admitted before that he brought some hard facts with him... but didn't know/try to apply them appropriately. There's a word for something that gives nothing but facts and does not apply them to a situation, it's an encyclopedia.

And your claim that it's a vague possibilty is ABSURD. It's used... every... day. Yeah, by those people who know about this type of thing the best, actually. Those crazed LN2 overclockers do this everytime that they boot up at eleventy billion gigahertz. What do you think a pressure cooker is? It's there so you can cook something at higher than 100C and it still be in water. Why? Because liquid water cannot exist at over 100C at 760 torr (sea-level pressure) and even less pretty much everywhere else. If you boil water at low it boils lightly at 100C if you put it up to high... it stays at 100C and boils faster. This is the SAME THING.

Here's how it works. They pour liquid nitrogen into what we all know is essentially a tube welded to a CPU evaporator block. The ultra cold liquid more or less pulls the thermal energy out of the CPU via the block. Now, what happens to the energy? It heats up the liquid, but wait! The liquid pretty much is already at it's BP while sitting in air at room temp. So, instead of heating up the liquid more, the LN2 vaporizes, taking energy with it. (How much is determined by N2s energy of vaporization, also known as the latent heat of vaporization, the amount, just so happens, to always equal the same amount of energy that just went into it via the surroundings and CPU etc.) And the temperature of the liquid remains the same. Why else do you see the LN2's temps stay so linear, eh? Because the liquid is "just that cold"? No... energy input always equals increased temps at a rate determined by... the specific heat of the material. Which is pretty damned low on LN2 btw. (Low = lots of temp increase for small energy input) We don't see this, why? What I mentioned above.

Simply put, ALL of these principles are exactly the same for any other liquid in cooling. Mine uses n-pentane because it's BP is at ~ room temp and wouldn't require more pressure than a plastic bottle can give to keep it in liquid form AND it won't cold bug your CPU.


Since you apparently want a textbook entry on everything

Quote:
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius
Quote:
For each gram of liquid water at its boiling point that we convert into steam at the same temperature, we need 540. calories of energy. This is called the latent heat of vaporization or latent heat of boiling for water.
Water's = 40.68 kJ/mol
Specific heat capacity (liquid) 4184 J/(kg·K)

LN2's = Heat of vaporization (N2) 5.57 kJ·mol−1
(look up the specific heat yourself)
Raptor Raper
(13 items)
 
  
CPUMotherboardGraphicsRAM
Something with transistors FOXCONN Boodrage -> eVGA classified e760 GTX 480 / HD6850@1090/1200 3x2 gig G Skill Trident DDR2000 
Hard DriveOptical DriveOSMonitor
2x128GB Crucial C300 Sumsung SATA DVD-RW 64 bit Windows 7 Samsung 245BW 
KeyboardPowerCaseMouse
Microsoft curve Tagan ITZ 800W DD Torture Rack Diamondback 
  hide details  
Reply
Raptor Raper
(13 items)
 
  
CPUMotherboardGraphicsRAM
Something with transistors FOXCONN Boodrage -> eVGA classified e760 GTX 480 / HD6850@1090/1200 3x2 gig G Skill Trident DDR2000 
Hard DriveOptical DriveOSMonitor
2x128GB Crucial C300 Sumsung SATA DVD-RW 64 bit Windows 7 Samsung 245BW 
KeyboardPowerCaseMouse
Microsoft curve Tagan ITZ 800W DD Torture Rack Diamondback 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Cooling Experiments
Overclock.net › Forums › Cooling › Cooling Experiments › Alcohol evap?