Posted by RAB on July 24, 2008 at 01:16:40 from (195.93.21.10):
In Reply to: Wind power posted by Reddy red on July 23, 2008 at 20:41:29:
Work it out. Find the density of air and away you go. Work done is force multiplied by distance moved, in Newtons, metres kilograms in my case. Your units might be a bit more difficult - foots, pounds, BTU's etc.
Keep in mind Albert Betz, of course, who said you can't extract more than about 59% of the dynamic energy of the air, as you have to stop it to do that, as then there would be nowhere for the air to go without giving it back some kinetic energy!(probably not make any difference here but needs to be kept in mind by any potential wind turbine builders)
You will not find it much as you may, or probably may not, be aware that the typical brick house design is about 4 1/2 psi in your units.
Bales are a different problem. The force needed to roll a bale can be far less than picking it up against the force of gravity. That is why wheels were invented.
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