LTD stirling engines are an interesting idea. They harvest the temperature difference of the environment versus a cold object, and using this they power some pumps.
stirling engine
How To Make a Low Temperature Differential (LTD) Stirling Engine
(via www.greenoptimistic.com)
Submitted by sweet_andra87 on Fri, 2008-04-11 08:55. | Tags: technology | boat | heat energy | how to | stirling engine
How To Build a Stirling Engine At Home From A Can
(via www.thegreenproton.com)
The Can Stirling engine can rotate using a candle as the heat source. This engine is constructed with very simple materials. There are a can, a balloon, a wood board and others.
Submitted by ovisoftblue on Fri, 2007-10-05 17:47. | Tags: technology | air engine | can | diy | stirling engine
Stirling engine (or hot air engine) - future of car engines (probably)
(via www.thegreenproton.com)
In 1820, when steam engines operated everywhere, Robert Stirling, a Scottish vicar, and his brother James built a new engine. They used an outside burn, additionally hot air was sufficient for the operation of the engine.
Submitted by ovisoftblue on Thu, 2007-09-27 14:55. | Tags: technology | air engine | hot air engine | stirling engine
