[Gasification] OT : Zeolithe heatpumps

[Art Krenzel]

These units are called heat pipes and contain all manner of heat transfer 
liquids - Ammonia, methylene chloride, water, etc.

Googling Heat Pipes will do the trick.

Art Krenzel




----- Original Message ----- 
From: <gfwhell at aol.com>
To: <praufast at free.fr>; <gasification at listserv.repp.org>
Sent: Tuesday, July 10, 2007 8:38 PM
Subject: Re: [Gasification] OT : Zeolithe heatpumps


> Phil. some years ago I read of the de icing system installed on the 
> runways of a North American air port.
> It consisted of? metal tubes some 30-40 ft long inserted vertically into 
> the ground spaced a few feet apart.
> These tubes, and there were hundreds of them, were hermetically sealed . 
> The internal arrangements inside them were
> of a similar nature as described by your Email?attachment. There was a 
> central coaxial tube?from a"boiler" at the lower
> end and a condensing area at the top. these upper and lower areas 
> contained absorbing material. The de-icing system relied upon the 
> temperature difference between the lower (BOILER) absorber and the upper 
> (CONDENSER) area. Heat was transmitted? up to the the runway surface, 
> being hot enough to melt snow and ice.
> I am not sure what the nature of the?fluid was. There were no moving parts 
> inside.?and in the summer, heat was taken down into the ground from the 
> runway surface in reverse mode. perhaps they would work in the desert?
>
> GF