I've been looking really hard at solar heat for cooling.
The least complex is just water/ammonia and just add heat, but the high pressure is too dangerous.


Refrigerator Uses Solar Energy
Crosley IcyBall

http://crosleyautoclub.com/IcyBall/H...meBuilt-sm.JPG

RV propane refrigerator is Too complex, 3 working fluids,
but could not this be driven by solar oven?
http://pic.srv5.wapedia.mobi/thumb/a...at=jpg,png,gif

How does one lower the operating pressure?
If a low temp fluid can be found, a compost pile can create up to 130+ F
temps to delivery 24/7 output.
This document about composting dead birds, getting 135 F to 150 F compost..
http://extension.umd.edu/publications/pdfs/fs537.pdf

Can not the use of activated carbon lower the operating pressure?

Using zeolite/water requires pulling a vacuum after heating,

Does using activated carbon with a working fluid: Acetone, methanol, etc
lower the operating pressure?

This device is fantastic, working at a very low temp of 104 F, but it does not
say what the working fluid(s) are.
Solar Ice Maker: No Moving Parts, No Electricity @greenUPGRADER

Heatpipes could be used to transfer a large area solar heat collection via flat panels.

MUST SEE VIDEOS about composting for 18 months of hot water and methane.
Jean Pain: France's King of Green Gold By Nicolas Poulain
(From: Reader's Digest -- November 1981 -- pages 76-81)

I've come to a dead end and was looking for feedback.
Thanks
Randy