This idea is from Anna.
I actually am supporting a program for alternative energy called Ocean Temperature Energy Change.
But for 3rd world areas, I have another idea.
Take a 55 gallon metal barrel and split it in half (you can build two of these with one barrel). Paint the inside with reflective paint or use aluminum foil. Take a large diameter (6 inches or so) pipe that is a little longer than the height of the barrel. Cap one end and the other end is capped but has 2 different length pipes going into it. Paint the large pipe flat black. Connect strong hydraulic lines to the two smaller pipes. These lines connect to a heat sink in the ground; a built one or an abandoned well. Someplace to store the great amount of heat for use when the sun is not shining.
You will also need a battery, solar panel, and a pump to keep the liquid flowing through your system.
This is the start of a homemade solar generating system. You can use this to heat a home, water, or connect the heat source to a reverse heatpump to power a generator.
You could take a savaged power seat frame and build a sun-tracking system to keep the collector always pointing at the sun. You can use the same battery system for this.
The University of Florida used a similar sized parabolic mirror and generated over 700 F degrees. Their heat sink was built with cement blocks. They used cotton seed oil. They were able to keep the oil above 300 degrees for 4 days in their heat sink. They also replaced the electric coils on a stove with copper coils for the oil to come through. They baked bread in the oven 4 days after the collector was shut down.
I do not need 700 F degrees to heat a house or water or power a generator. So I can use an inefficient collector.
Something to consider....
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