5 degrees--but
the water in both jars had ICE. I invite others to try this,
and please let me know if you get ice at 55 or even 60 degrees
outside air temperature (minimum at night). A black PVC container
may work even better than a black-painted jar, since PVC is a
good infrared radiator--these matters are still being studied.
I would like to see the "Funnel Refrigerator" tried in desert
climates, especially where freezing temperatures are rarely
reached. It should be possible in this way to cheaply make ice
for Hutus in Rwanda and for aborigines in Australia, without
using any electricity or other modern "tricks." We are in effect
bringing some of the cold of space to a little corner on earth.
Please let me know how this works for you.
XI. Conclusion: Why We Need Solar Cookers
The BYU Funnel Cooker/Cooler can:
-Cook food without the need for electricity or wood or
petroleum or other fuels.
-Pasteurize water for safe drinking, preventing many diseases.
-Save trees and other resources.
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