Re: electricity from a gym: quick calcs

On Wed, 12 Sep 2007 18:45:56 -0700, "David L. Jones"
<altzone@xxxxxxxxx> wrote:

On Sep 13, 4:56 am, mrdarr...@xxxxxxxxx wrote:
I had a conversation with a co-worker about harnessing energy from
folks dancing on a dance club, and from folks walking in a mall during
the shopping season. I was skeptical, thinking the capital costs
would outweigh any benefit, but decided to run the calcs just to be
fair.

<snipped a bunch of original posting>

If you frequent gyms as I do you'll know that probably around 90% of
the people on the equipment like treadmills, bikes and rowers are
complete slackers. They don't work hard, and most come off barely
having raised a sweat.

Also, cables are a trip hazard, so lots of bikes and rowers are self
powered, only switching on when you start rowing. Can't feed those one
back to the grid unless you have an expensive facility retrofit.

How expensive? Most of the gym equipment I see already has a
generator of some sort installed - to operate the equipment
screen/control system. There is likely excess capacity already
built-in, even for the slacker-user.

All that is needed is some cabling and an inverter to feed back to the
grid or power the gym lights, etc.

It might be economically feasable after all.

John
.

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