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Originally Posted by bird
As for the reason that the temp rises when the cooling is turned off, there are really two heat sources to blame - one is the core of the mirror as has already been pointed out, and the other one is the hot side of the peltiers (the heatsinks). As soon as you turn off the power the "heat pump" effect stops, and heat can flow back into the system from the hot side.
The fans that are normally used to blow the cold air off the coldplate and onto the mirror then turn into fans that are blowing warm air as the heat from the hot side gets back into the system via the peltiers.
cheers, Bird
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Hi Bird,
Just a thought.
Have you considered going the chilled liquid route for cooling the mirror? I used such a method to cool a Medium Format "cold" camera over 20 years ago.
It's a lot messier to construct but does have the advantage that the heatsinking and radiator for the hot side of the system can be kept well away from the telescope.
On the bonus side, you could use a 2-3 stage Peltier pump.
Cheers
Ian