> > http://techref.massmind.org/techref/other/zeolitefridg.htm
>
> That one is very interesting.  A couple of  questions:
> 
> - what is the purpose of the heat exchanger?  Could the water 
> freeze in there and cause maintenance problems?

To cool the refrige box. If the water freezes, it will only stop operation
long enough for the ice to melt.

> - how much vacuum is required?  I'm thinking an electric 
> vacuum pump made for hot rods might be useful.  They 
> generally turn on at < 15 psi and pump until 25 psi is reached.

The purpose of the vacuum is to make the water boil at a lower temperature.
So the amount of vacuum needed is enough to make the water boil at the
temperature you want the refrige to maintain.

> - do you think the adsorption material would get hot enough 
> from solar power?  100*F is pretty hot!

Even without a concentrator, you can get 150'F easy in full sun.


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