Quote Originally Posted by desone View Post
Just one small suggestion. You have done an excellent job there. With so mant peltiers you would have had no option other than to go for a heat exchange system using water on both sides. I am using two 68w peltiers with an air cooled system on the hot peltier side.

You will get some heat transfer between the hot and cold side with the clamping stainless steel bolts. My advice would be to go for slightly smaller diameter bolts and use transistor insulating mounts (plastic) to insulate the two sides. You could eliminate the heat transfer almost entirely.

These are the type of insulators I am referring to.

http://s263.photobucket.com/albums/i...e01/screws.jpg

You could also use nylon bolts and nuts.
Nylon and plastic are OK as long as everything stays cold, but not if the pelt ever gets hot - the nylon will not hold torque. Fiber washers and stainless steel bolts are a better choice - the SS does not transfer much heat. I use 3mm SS. Take care to apply torque evenly and not too much - the pelt can crack if one side is tightened before the others. A neoprene gasket will help to keep radiant transfer between hot and cold side down. But if the temp differential is small, loss from those factors is not really a factor.