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Posted by no spam on September 26, 2006, 3:35 pm
 



Because its a proven technoligy, fairly cheap and isn't all that dangerous.



I have also thought of 'geo' by using an open loop ground water (i.e. water
from a well) or closed loop.  But they require pumps which requires fair
amounts of power.  They also require a lot of work and money.  Drilling a
well or burying the water line loops.



How do you do that?  I don't see a thermal syphen working on a home cooling
scale.



Maybe, which I would doubt, but you are looking at a much larger money out
put.



Posted by John Ladasky on September 26, 2006, 1:13 am
 
willbanks wrote:

Why would you want to work with ammonia, which is volatile, and toxic?
A geothermal exchange system can provide you with air conditioning,
without any hazardous working fluid.

http://geoexchange.com/

The only moving parts in a geoexchange system are two fans.  Because
you use the soil as a heat sink, you also have a lot of leverage.  It's
not uncommon to obtain the same cooling effect with a 1,000 W
geoexchange system as you would with 2,500 W of active cooling.  So,
you could probably even run a geoexchange system with solar PV, and
still achieve efficiencies in the same range as your ammonia-based
solar thermal cooler.

Having the ability to operate on electricity would also allow you the
option to continue to cool the house after dark.  This is not so
important where I live in California, because the humidity is always
low here, when the weather is hot.  But I lived in Baltimore, Maryland
for a while.  The heat and humidity can continue well into the night
there.  I can only imagine that it's worse in Georgia.

A quick look at this site...

http://www.griffin.uga.edu/aemn/

...suggests that deep soil temperatures, which are about the same as
average year-round air temperatures, are around 68F in your area.
That's quite workable for air conditioning.

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Posted by Jeff on September 26, 2006, 1:19 am
 willbanks wrote:

Just to give you another direction.

   Look into the desicant driers, it's relatively easy to to dry the
desicant with solar heat and then you add moisture for evaporative
cooling. A lot less trouble than an absorption cooler.

   Jeff




Posted by no spam on September 26, 2006, 3:35 pm
 
Hum. . .hadn't thought about that.  Any numbers on how well it would work.

Also with just a quick brain storm I can see several problems to over come.
The desicant would have to be moved from a drying chamber to an evaporation
chamber.  Then you get into what liquid to use.  Water pops to mind but how
much cooling could you get with water?  Using any other liquid would require
you to recover the liquid.

But it does give me something to think about.



Posted by Joe Fischer on September 26, 2006, 4:40 pm
 

        
         Evaporating water on the outside of a heat exchanger
to cool the water inside should work well.
         Just fasten a burlap cloth on the sides of the heat
exchanger, and it will be cooled to about 55 or 60 degrees,
even in the high temperatures there.

         While you are at it, maybe build some freon engines
using direct sun on the boiler and the condenser with the
burlap and evaporating water for the cool side.

         I don't know how much stirling engines run, or
if they are easy to build, but free energy while the sun
shines would be nice.

Joe Fischer


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