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01-04-2009
 Thermal considerations
What people seem to forget is that when you use a peltier, you not only have to cool the heat from the CPU, but the heat the peltier itself generates. This means that if your CPU is generating say 85W, and your peltier is running at 12V/18A, the total amount of heat generated at the hot side of the peltier is 301 Watt! That is an insane amout of heat and you''ll need a good watercooling solution, probably at least double or tripple radiator, if you want your CPU to run cooler with the peltier unit than without it.
I wonder why no vendor ever posts the peltier units datasheet, detailing its voltage/current/deltaT/heat_transfer graphs.
The other thing is that peltiers heat transfer depends on the temperature difference between its two plates. Maximum heat transfer occurs at deltaT = 0ºC, while heat transfer stops at about deltaT = 67ºC.
In short, how good this peltier will work will greatly depend on how cold (= how close to ambient temperature) you can keep the hot side of the peltier. |
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