http://www.thedailygreen.com/environmental-news/latest/stirling-solar-power-46012108
Can Stirling engines coupled with solar power be the key to meeting our energy needs? First off, what is a Stirling engine in the first place. A Stirling engine works on any heat differential: that is it has a hot side and a cold side. This temperature differential is used to generate kinetic energy (motion).
I’ve actually built a Stirling engine using this kit:
http://www.stirlingengine.com/ecommerce/product.tcl?product_id=87
And here you can see it working on boiling water and on ice:
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