I learned that peltier elements give better cooling on cascading but need to be growing in size towards the hot side.
I have 4 peltier elements of 40×40×35mm and I am planning to make a portable fridge.
Now the question is should I line them along one side parallel to each other or should I stack them up (2 sets of twos)?
If I should stack them up, should I just place them one over another, or connect them via heatsinks/metal sheets?
If I should place them parallely (on single wall) what should be the minimum distance between them?