Whats the effciency of a pelt heat pump? Somehow I doubt it approaches a compressor.
Anyway, do a little math here!
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Before the CPU waterblock, water goes through a block mounted on the cold side of a low powered ( 40-80W ) peltier, hotside aircooled.
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4.186 j/degree C is the specific heat of water. Plug in the output of your pelt and your flowrate and see for yourself what the maxium performance possible is.
Without getting a calculator, I'd think you'll need about 500w of cooling per degree below ambient in a reasonably high flow, 1/2 inch system.