Good question. It's designed to turn itself off as summer approaches.
The angle angle at which sunlight strikes the glazing - see the
explanation at http://www.iedu.com/DeSoto/Astro/Seasons.html - provides
seasonal control. You can get more information still by doing a Google
search on "critical angle".
It's also possible to shut the panel off completely in any season by
covering the glazing.
Before electricity became common in south Georgia, our neighbor had a
refrigerator that ran on propane. After college I worked in a huge
drug store in Tennessee whose air conditioner used a gas burner
instead of a compressor. Has anyone ever made a room cooling system
that used solar heat to drive the ammonia cycle and passive convection
instead of a fan to spread the cooler air? A lot of our electricity in
the south is used for cooling, but I've never heard this discussed.
It's theoretically possible, but loaded with so many practical problems
that the problem will probably be solved in some other way.
As resources have permitted, I've been working another approach which
seems promising - and talk about the approach (without providing much
detail) in the web page at http://www.iedu.com/DeSoto/Journey.html
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