Re: [Paddlewise] Fres Water

I don't think you can generate enough pressure to overcome the osmotic
pressure of the sea water by this method. Depending on the type of membrane
being used, commercial units need to be operated at anywhere from 200 PSI to
400 PSI. That is why there is so much energy required to produce potable
water.

This is not the same as trying to pump water through an ordinary filter. You
are trying to filter at the ionic level (smaller than molecules).

If you were to try and do this by foot while paddling, I don't think there
would be any energy left to move the paddle. As Arthur Hebert found out,
this method could allow you to survive, but it certainly would be very
difficult to produce another water for drinking, cooking, etc.

Just my 2 cents as someone with almost 30 years experience providing
industrial water treatment.

Steve Holtzman
----- Original Message -----
From: "Rafael Mier Maza" <sildriel_at_ciateq.mx>
To: <PaddleWise_at_paddlewise.net>
Sent: October 15, 2001 7:23 AM
Subject: Re: [Paddlewise] In-Reply-To: <82.118add2c.28fc3725_at_aol.com>


> The same effect but on a continuous basis could be obtained by opening a
> small hole under the hull that will push water into a membrane. Some of it
> may pass into a container, some may be drained back to the sea with all
the
> salts.
>
> That would give enough pumping power. The cost of it would be added drag.
> The hole or water entrance could be opened or closed depending on the need
> of water or speed.
>
> Best Regards
>
> Rafael
>
> At 08:57 a.m. 15/10/01 -0400, linwarfl_at_aol.com wrote:
> >OK. inventors, get busy! I generate a lot of energy just paddling.  So
why
> >not hook up a harness or some quickly releasable (for safety purposes)
> >apparatus so that my paddle strokes translate into "pump" action for a
water
> >purification set? Maybe a paddle stroke could translate into one-forth of
a
> >manual stroke on the water
> >purification set to decrease any extra effort to paddle. But the
accumulative
> >action of paddling could translate into a lot of water purification set
> >pumping action. Give it some thought!
> >
> >
>
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PaddleWise Paddling Mailing List - Any opinions or suggestions expressed
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