Delta 60C, luxury! The heat of summer is a real pain isn't it Mike. The delta T of a two stage Peltier is about 60C with a small heat load. The delta T you see in the electronic specifications for Peltier arrays are with no load and in a vacuum.
I have ordered an 80l upright freezer and I am going to use it to cool a 50% mixture of antifreeze to about -18C. I will then pump this to the 'hot' side of the peltiers on my camera fridge. This means the camera fridge interior will be able to get to -35C with ease. Even at this fridge temperature (-35C) my sensor will be at -18C.
At the moment the best the fridge can do is about -10C. So sensor temp is 7C.
The first thing to do will be to drill two holes in the new freezers door.
Here is a thread with more detail.
http://www.iceinspace.com.au/forum/s...ad.php?t=54087
We had a saying at CSIRO 'if you begin to doubt your own sanity you are still doing OK'.
Bert