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How to control 12v 60W peltier cooler

post #1 of 5
Thread Starter 
I recently purchased a peltier units to cool my pair of GTX 480 Graphics cards, and now I'm looking for a cost effective way to control them accurately and digitally (preferably with some kind of LCD read out). I have looked at some PID controllers online but they are still a bit pricey, and I would rather not build my own by utilizing a arduino and motor driver shield. If any of you guys have purchased sub $50 controllers in the past or know if you can use standard sous vide controllers with peltiers I would greatly appreciate it. Also can common household thermostats be used to control peltiers? All in all I'm looking for a sub $50 way to control a peltier element.

Note - I already have a capable power supply and proper control equipment for that power supply.
Thanks,
Chmod Labs
post #2 of 5
It would be helpful to know if you will be using them to chill water or putting them directly on the chips themselves. Firstly, i would like to say that running the peltier at 12v would be unwise as the maximum efficiency is somewhere below that. Putting too much power into a peltier will just cause extremely high temperatures and instability. Having some sort of simple DC-DC converter with ability to adjust is your best bet. From there just tune it with a multimeter until you get the desired voltage. From there it is all about Delta -- difference in temperature between hot and cold sides. The peltier is only as efficient as the cooler can be. If you want to move 30 degrees from the GPU the hot side heatsink will have to move that much more heat than normal (this only applies to directly applied peltiers).
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post #3 of 5
Thread Starter 
I plan to use the pair of coolers to chill water, and I'm looking for a simple purchasable way to control both of them in a product somewhat similar to a driver board, pid sous vide controller, or something like that that's below or right around $50 thanks.
Chmod Labs
post #4 of 5
According to this review your going to need more than a couple 60watt peltiers to cool them.

http://www.guru3d.com/article/geforce-gtx-470-480-review/13

GeForce GTX 480

System in IDLE = 209 Watts
System with GPU in FULL Stress = 463 Watts
Difference (GPU load) = 254 Watt (TDP = 250W)
post #5 of 5
Quote:
Originally Posted by Mindchi|l View Post

According to this review your going to need more than a couple 60watt peltiers to cool them.
http://www.guru3d.com/article/geforce-gtx-470-480-review/13
GeForce GTX 480
System in IDLE = 209 Watts
System with GPU in FULL Stress = 463 Watts
Difference (GPU load) = 254 Watt (TDP = 250W)

they pump out right around 250W of heat from my experience (TDP always seems to be off with GPUs for some reason)... mindchill would know better, but i dont think that 120W of pelt will be anough considering you plan to run at 12V (not always the best voltage) and you plan to run 2x with 60W maxes... that's only like 80W (for arguments sake), in witch case it will probably become swamped by a full loop and there will be very minimal effect on temps... as for the controller, i would just look for a good PMW contoller... check out this guide smile.gif

http://tecpeltier.com/viewtopic.php?f=4&t=19
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