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<t>Daniel,<br/> <br/> Thank you for thinking about this.<br/> <br/> I agree with you that it would take substantial energy to take water from room temperature to >100C.<br/> <br/> My thought went further though:<br/> 1) heat water to 100C<br/> 2) heat water further to 101C (water is now a gas; use t...

<t>I have read that Stirling engines need large temperature <br/> differentials so that sufficient expansion and contraction of gas can <br/> take place.<br/> <br/> But what about using something other than air in the chamber? if <br/> water was used, for example, wouldnt you just need to heat it up...

<r>how effective would it be to concentrate sunlight on the hot side of a<br/> Stirling engine? it seems like this would heat the hot side to<br/> hundreds of degrees hotter than the cool side (ambient air temperature).<br/> <br/> wouldn't this be more efficient than photovoltaic technology or using...