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Posted by no spam on October 9, 2007, 2:39 pm
Can anyone here point to somewhere I can get some GOOD info on how
absorption type cooling units work and better yet where to find some
construction details?

I'd like to do a little experimenting on using solar thermal for cooling.  I
have found info on a solar ice maker but it is not a continuous cycle

Thanks for any help.

Posted by Jeff on October 9, 2007, 11:57 pm
no spam wrote:

   I posted some links here a while ago for solar desicant cooling.
Basicaly It's a CaCl brine that is regenerated by the solar heat. Think
of it as a swamp cooler, with the dessicant removing the humidity. It
can run on solar heat in the 110F (if not lower) range. The concept is
dead simple, you spray brine through the incoming air to remove humidity
and later you spray it through hot air to drive off the absorbed
moisture. Google this group or the web for solar desiccant cooling.


Posted by no spam on October 10, 2007, 1:28 pm

Not what I'm looking for.  I'm looking for some info on making an NH3
absorption type cooling system at home.  I want to see, either by
experimentation or by other people's experiments, if:

1) It can be operated with solar
2) If so if it could be up sized to cool a home
3) How much area would be needed for the solar collectors
4) How much NH3 would be needed
5) The range of temps it would work in

and many other things

Posted by Jeff on October 10, 2007, 3:10 pm
 no spam wrote:

Why don't you google it up? Absorption cooling is a mature although
complex technology and somewhat dangerous. You will need roughly twice
the BTUs to for each BTU of cooling.

   Here's a small scale with a COP of .45

<URL: http://www.airah.org.au/downloads/2005-12-01.pdf  />

     Figure out your cooling load per day and multiply that by roughly
            2 for the COP and roughly another 2 for the collector
efficiency. Then look up what the daily insolation is for your situation
(collector orientation, location and time of year), NREL has all that
and you can google that up too.


Posted by no spam on October 10, 2007, 5:48 pm
I've googled, I've yahooed, I've even went low tech and spent some time in
the library.  About all I can find is either high tech, industrial, co-gen
stuff or something about a third world over night ice making system.

I disagree a bit.  From what I have found it can be complex but it doesn't
need to be.

One of the things I need the info for is to see if its worth while.  I'm
thinking the major factors will be the cost and size of the NH3 system.

The area of collectors may be the biggest no-go factor.  The home will be a
concrete dome therefore it will not have a roof per se on which to mount
anything.  Also I'm in a hurricane area and building large solar collectors
to withstand 100+ mph winds would be a problem.

I will have to have a secondary system for overnight cooling and the days
when the sun isn't out.

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