Have you ever heard of the Sterling engine?
It is an old, and simple engine designed to run on heat, usually WASTED heat.
The Seebeck devices are similar, but use ‘electronics’ to achieve a similar result.
The Sterling is just a simple piston engine run with the combustion source outside. Because of that, you could use a mirror reflecting sunlight.
Simple, clean, easy, efficient.
So, why isn’t everyone talking about it?