Hybrid Car – More Fun with Less Gas

Storing wind-generated energy as gravitational potential energy? - Page 2

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Posted by Rod on December 7, 2008, 4:56 pm
John Nagelson wrote:

Getting four tonnes of material isn't a problem.

But what mechanism have you got that would raise that four tonnes 100
metres straight up?

Or 40 tonnes 10 metres?

Or 400 tonnes one metre?

The raising and lowering has to be a) safe; b) controlled; c) connected
to some sort of generator.

And all that for a measly 1 kWh.

Maybe if you had an arrangement which used your whole house as the
weight? But the cost of making it (in financial and resources terms)
would be prohibitive.


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Posted by Andy Burns on December 7, 2008, 5:09 pm
Rod wrote:

I haven't got one, I was just pointing out the scale of the problem


Posted by PCPaul on December 8, 2008, 8:25 pm
 On Sun, 07 Dec 2008 17:09:00 +0000, Andy Burns wrote:

The only place I've seen this work is in an LED standard lamp - you
manually lift a mildly heavy weight from floor to 5' off the ground, then
it falls slowly while running a generator (through a gearbox) for a
couple of hours.

If you're seriously looking at this sort of thing you need to get your
whole house consumption down from 1kW average (what ours is while
occupied, TV on etc.) to a few hundred watts at most.

Posted by meow2222 on December 7, 2008, 3:42 pm
 John Nagelson wrote:

a persistant myth

how would you arrange gearing? Or would you have it only charge when
half max windspeed were reached, and throw away any extra energy at
higher speeds?

Have you calculated what mass and height you'd use?


Posted by Andy Burns on December 7, 2008, 3:48 pm
 meow2222@care2.com wrote:

Fiddle with the numbers in google calculator

http://google.com/search?q= (3675+kg)+*+(9.81+((meters+per+second)+per+second))+*+(100+meters)+in+kilowatt+hours

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