creating a refrigerator and need help

Hello all im an industrial design student, and looking to make a non AC refrigerator but open to DC ideas such as solar power. I've been looking at the cheapest methods such as propane refrigerators and the Einstein refrigeration method, doesn't necessarily have to be super functional (super cold) but the method needs to be very cost effective and cheap.

So im wondering if anyone can recommend any refrigeration methods, any good source material to get me started (rookie), any possible companies to get in contact with?

I would be massively grateful!!

thank you to all suggestions

submitted by /u/adidasrinnegan
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