>
> On Aug 3, 2007, at 10:53 AM, James Newtons Massmind wrote:
>
>>
>> I have seen a "closed loop" refrigerator similar to this in
>> rural Nicaragua. Here's what I remember about that one: the
>> owner placed it outside in the sun until the  ammonia was
>> fully compressed (heat from the sun caused the ammonia to be
>> forced into liquid form into a pool by a one-way valve). When
>> it was then put into the "icebox" and a valve released, it
>> made ice all night long as the ammonia evaporated. Except for
>> the fuss of dealing with the "cooling equipment", it worked
>> as good as any modern refrigerator. I remember it as being
>> made of glass and tubes, but it might have been stainless
>> steel here and there.
>>
>> I have a client who is incredibly interested in solar
>> products. He is presently experimenting with "swamp" (water
>> evaporative) coolers. He has reduced the temperature of my
>> office from 110F to 75F by use of a proprietary means of
>> forcing the evaporation of water by breaking the water into a
>> fine mist.
>>
>> This "swamp cooler" and the Nicaraguan refrigerator work in a
>> similar way.

The ammonia approach does not add humidity to the air while the
swamp cooler increases humidity and works poorly when humidity
is already high.
http://en.wikipedia.org/wiki/Evaporative_cooler <---- see second  
paragraph
Cedric
>
> Have you seen our heard of Zeolite adsorption (not misspelled)  
> cooling?
>
> http://techref.massmind.org/techref/other/zeolitefridg.htm
>
> Check the links at the bottom of the page.
>
> ---
> James Newton, massmind.org Knowledge Archiver
> james@massmind.org 1-619-652-0593 fax:1-208-279-8767
> http://www.massmind.org Saving what YOU know.
>
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