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From: friesen@psivax.UUCP (Stanley Friesen)
Newsgroups: net.physics
Subject: Re: TPMMTP (Thermodynamic PMM to ponder)
Message-ID: <440@psivax.UUCP>
Date: Fri, 3-May-85 17:57:38 EDT
Article-I.D.: psivax.440
Posted: Fri May  3 17:57:38 1985
Date-Received: Mon, 6-May-85 00:39:51 EDT
References: <517@terak.UUCP> <3676@alice.UUCP>
Reply-To: friesen@psivax.UUCP (Stanley friesen)
Organization: Pacesetter Systems Inc., Sylmar, CA
Lines: 41
Summary: 

In article <3676@alice.UUCP> jhc@alice.UUCP (JHCondon) writes:
>***
>
>Another PMM ?
>In some places of the world, the Bay of Biafra is one, sunlight causes
>heating and evaporation which results in first tens of feet of
>water being more saline and warmer than the water several hundred feet down.
>
>Take a 200 foot long pipe and suspend it vertically with its top end
>about ten feet below the surface. Now start and upward flow in the pipe
>by exhaling air into the bottom end, the bubbles rising in the pipe will
>drag the water along with it. As the less saline water warms
>by thermal conduction through the wall of the pipe it becomes less
>dense than the more saline water on the outside of the pipe. This density
>difference then maintains the flow once started.
>
>On the other hand one could start the flow downward by dropping rocks
>down the pipe. (Be careful not to drop them on the diver.)
>It this case the more saline water inside the pipe cools becoming denser
>than the outside water and so the flow will continue downward.
>
>Whichever direction you choose you can put a turbine with electric generator
>on the end of the pipe. Any excess power should be converted into matter
>in the form of rocks in case you need to restart.
>
>Is this a perpetual motion machine?
>Let's hear more about machines that run either direction.

	No, this is not perpetual motion, since it gets energy from
outside. It is in fact a rather inefficient form of hydrothermal
power. The energy input comes from the Sun heating the water, which
energy can then be extracted by any appropriate method.

	BTW, I doubt there would be much excess power to be
extracted, so it is probably not a useful form of Solar Power.
-- 

				Sarima (Stanley Friesen)

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