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Alex I have managed to get a second hand 100l freezer. It can get down to -25C. I will use this to cool a 50% anti freeze solution to about -20C and pump this through the cpu water block to cool the hot side of the Peltier. This should get at least -35C or more as an environment to cool the camera.
The freezer has a 190W compressor which means it can pump at least twice this in the form of heat. This is equivalent to about 800W of Peltiers.
Bert
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