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Posted by no spam on September 28, 2006, 11:43 am
 

And the stories of burning lungs, blindness and death keeps them from doing
so.  You  have to remember that every spring hundreds if not thousands of
tanks of ammonia are on the roads and in the farm fields across the US.  Now
when was the last time you heard so a NH3 death in the US?



Posted by no spam on September 28, 2006, 11:43 am
 

They may not have nuke fuel laying around but most homes have everything
needed to make rocket fuel.  And if they don't have it on hand a trip to
Wally World would take care of it.  All you need is a little know how and a
little work.

Heck the first 'rocket fuel' was nothing more than black power.  I made that
in the shop at home when I was a kid many years ago



Posted by no spam on September 27, 2006, 5:42 pm
 
So can a lot of things like riding in a car.  In both cases you just have to
use a little common sense and a few readily available, inexpensive
protection apparatus.  Working with NH3 outdoors and a way to flood the area
with water spray, such as a sprinkler, adds to your safety level.




Posted by Merlin-7 KI4ILB on September 27, 2006, 11:07 pm
  Well back to the subject and the question asked.

 Why not run a pipe down the center of some kind of tube with a concave
reflector at the bottom focased on your pipe containing the ammonia and a
clear top. If possible you could put a vacume in the tube for added
insulation.
 That should give you a good boiler for your refrigerant.

 If you work it right, you could use gravity and the fact that heat rises to
do away with anykind of pump.

 You would have to play with the size of the solar tubes to get the results
needed but I see no reason why it would not work.

 It would work the same way many refrigerators in campers work.You would
just replace the heat source, instead of a flame you would use solar on a
bigger scale...

 Joe



Posted by John Ladasky on September 25, 2006, 10:45 pm
 
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
geoechange system as you would with 2,500 W of active cooling.  So,
could probably even run a geoexchange system with solar PV, and achieve
efficiencies in the same range as your ammonia-based solar thermal
cooler.

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 termperatures, are around 68F in your area.
That's quite workable for air conditioning.

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