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The Stirling engine model shows how the external combustion engine works. The principle of operation is based on periodic heating and cooling of the working fluid with the extraction of energy from the resulting change in the volume of the working fluid. It can work not only from burning fuel, but also from any heat source. Up to 40% Off on Car Accessories - Car & Vehicle Electronics with free shipping and No Tax!!! http://bit.ly/2f5LSDF Subscribe to the channel Super technology - http://www.dai