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#31
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cooling computer with refrigerator
shegeek72 wrote:
I've been thinking about blowing cold air into a puter case. what's the possibily of building a small refrigeration unit and blowing the cold air inside the case? I did a cursory search on google and didn't find much. 2 words: peltier devices |
#32
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cooling computer with refrigerator
No One wrote:
Rod Speed wrote: dj_nme wrote Rod Speed wrote WindsorFox wrote visions of effty wrote shegeek72 wrote I've been thinking about blowing cold air into a puter case. Water cooling only takes care of the CPU / GPU, while the other devices: HD / CD / DVD, other MB chips, etc are left to fans. I know nothing about cooling compressors, but what's the possibily of building a small refrigeration unit and blowing the cold air inside the case? I did a cursory search on google and didn't find much. The reason you didn't find any information on blowing cold air into a computer's case probably has something to do with a little thing called "condensation." If you are cooling surfaces that don't need it to temperatures below the ambient temperature of the room the moisture in the air will begin to collect on those surfaces as very dangerous beads of liquid water. There is also the problem of a rise in static electricity as the temp and humidity fall. The humidity will increase in that case. I'm not so sure that the cold air from an airconditioner has higher humidity than the surrounding air. Corse it does, just like any air that is cooled does. The reason is that the colder air has less energy to maintain the water as vapour. Waffle. Just look at an airconditioner set to cold, there is water dripping out of the cold side after it has condensed on the coils. Yep, beause the cold side is below the dew point. If you wanted to maintain or increase the humidity of the cold air, you'd have to use a device to add water vapour back into the air. Nope. Yup. It's called a humidifier. Not used when its cooling, only when its heating. Tell that to all of the Canadians up North that have humidifiers running in the winter. That's when its heating, stupid. |
#33
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cooling computer with refrigerator
visions of effty wrote:
Water is conductive, and not a particularly good thing to have randomly appearing inside your computer! some computers actually are water cooled, but they don't apply the water directly to the electronics. They typically use distilled water or water + antifreeze that's chilled, run it through heat exchangers, dand then pass air through those heat exchangers to cool it down. Chilled water can then be supplied by an external refrigeration unit. Yes I've seen a computer that did this (it was an older design that used TTL if you can believe it). Gandalf may have seen one or two of these in his military career... can you say UYK-7? so yeah, what you said, with a bit of a caveat. |
#34
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cooling computer with refrigerator
Gandalf Parker wrote:
Usually moving the air will do the most good. You shouldnt need to cool it unless it is a really hot room. Then you might as well cool the room. there are some limits, but here's the basic calculations... there are 3 basic thermal conductive layers you have to deal with. The first two are fixed and more or less cannot be changed (the CPU material and substrate, followed by the heat sink material). The differential temp across each of these components is directly proportional to the heat transfer rate, and inversely proportional to its thermal conductivity. So double heat transfer, double differential temp. Ideally in a balanced system the heat transfer rate will be more or less a constant, determined by the power load of the CPU in watts. This means that the differential temp of the CPU case and substrate and heat sink are more or less constants. You can probably read them from the appropriate tech manuals. Next is the variable part, the air temp. The average air temp determines the average conductivity so you can look at the differential temp of the outlet - inlet air, which is proportional to the heat transfer rate, and inversely proportional to the mass flow rate of the air. To reduce the temp of the CPU you must increase the mass flow rate such that the differential temp of the CPU + heat sink plus the average temp of the flowing air is equal to the temp that you want to maintain in the CPU. So if the CPU is at 140 degrees F, and the temp drop is 40 degrees F (heat sink + CPU case and substrate), then the average air temp needs to be below 100 degrees F in order to keep the CPU temp at or below 140 degrees F. If the inlet temp is 80 degrees F and the exhaust temp is 120 degrees F, this would work (in a properly designed system). However, if the inlet temperature were raised to 90 degrees F, you would have to exhaust the air at 110 degrees F to maintain the desired CPU temperature. To accomplish this, the flow rate of air would have to double because the differential temperature is now 20 degrees instead of 40 degrees. In addition, the fan would consume 8 times the power in order to double the flow rate (an important factor for laptops) and would generate additional heat, requiring (possibly) even MORE cooling air to compensate. Placing a peltier (or other cooling) device on the inlet would, in fact, offset this by lowering the inlet temperature, which would then allow for higher differential temperature of the air, and thereby prevent the need for a larger fan. It is quite possible that the peltier device would consume less power than the larger/faster fan (though I'm only guessing at this point), but only in some configurations (in other configurations, larger fans might be more efficient). Basic heat transfer/fluid flow stuff, at any rate. |
#35
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cooling computer with refrigerator
HiEv wrote:
Heh... Anyone else reminded of the guys who overclocked a old 486 from 33 MHz to 247 MHz by putting it in a freezer? heh - good one. Them were the days... |
#36
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cooling computer with refrigerator
Have seen CPU's dramatically over clocked with liquid nitrogen cooling.
-300 C, makes a huge difference to the conductive properties of a small strip of gold leaf. lower entropy, lower resistance |
#37
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cooling computer with refrigerator
3) -300C can otherwise be expressed as approx -27K... in other words
_below_ absolute zero. probably meant -300F (-184C) which perhaps could be cooled by liquid N? |
#38
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cooling computer with refrigerator
No One wrote:
Rod Speed wrote: Not used when its cooling, only when its heating. Tell that to all of the Canadians up North that have humidifiers running in the winter. That's when its heating, stupid. Nope. They were running whether the heat was on or not when I was there. They said the humidity is so low it can cause skin problems. BTW, what's with the name calling? Insecurity on your part? It's all in the sig. -- +-------------------+ .:\:\:/:/:. | PLEASE DO NOT F :.:\:\:/:/:.: | FEED THE TROLLS | :=.' - - '.=: | | '=(\ 9 9 /)=' | Thank you, | ( (_) ) | Management | /`-vvv-'\ +-------------------+ / \ | | @@@ / /|,,,,,|\ \ | | @@@ /_// /^\ \\_\ @x@@x@ | | |/ WW( ( ) )WW \||||/ | | \| __\,,\ /,,/__ \||/ | | | jgs (______Y______) /\/\/\/\/\/\/\/\//\/\\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ ================================================== ============ fix (vb.): 1. to paper over, obscure, hide from public view; 2. to work around, in a way that produces unintended consequences that are worse than the original problem. Usage: "Windows ME fixes many of the shortcomings of Windows 98 SE". - Hutchison |
#39
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cooling computer with refrigerator
No One wrote
Rod Speed wrote Not used when its cooling, only when its heating. Tell that to all of the Canadians up North that have humidifiers running in the winter. That's when its heating, stupid. Nope. Yep, even the stupidest canuck doesnt cool in the winter. They were running whether the heat was on or not when I was there. They said the humidity is so low it can cause skin problems. Only happens in their winter, stupid. BTW, what's with the name calling? No name calling, just an accurate description. Insecurity on your part? Nope, I've always been into accurate descriptions. |
#40
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cooling computer with refrigerator
DaveW wrote:
That would be a very thermally and electrically inefficient way to cool the computer. Do a search on computer cooling and you will find all sorts of effective devices sold. For example: Asetek Vapochill LightSpeed [AC] CPU Cooling System http://www.systemcooling.com/vapochill_ls-01.html Asetek VapoChill LightSpeed [AC] http://www.extremeoverclocking.com/r...hill_LS_1.html It's basically a small "refrigerator" that connects a tube to the CPU and cools it directly. It includes various precautions to prevent condensation. -- The difference between intelligence and stupidity is that intelligence has its limits. |
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