Ever wanted to take your frig camping. But because there is no electricity, you opt for the ice cooler instead. WHY? I mean, it is great if you are planning a day trip, or two; but what if your plans are for a longer stay??
Well then you are limited on what you can bring, Correct!?
Unless you are camping near a very cold stream, (just after the winter thaw), you really can not count on the water keeping your perishables cold enough in the sun light.
Or Can You!?
Please study the diagram below.
The principles are easy. You use two cylinders, sand and the process of evaporation to occur, and you could have an out doors refrigerator with out electricity.
You have a metal inner cylinder and an outer cylinder made from wood, plastic, etc. A gap between the two cylinders is filled with a material that is porous and holds water well, (example some kind of granules, soil, sand, etc.). Then soaked material with water and place it in the sun. Evaporation now will occur. As the water evaporates, the heat is removed from the inner cylinder, keeping the contents at a cool temperature of 6 degrees Celsius. In order to keep the refrigerator functioning, you will need to re-soak the porous material when needed. Now that stream, river or lake can be any temperature.
Oh come on! Did you think it required no work on your part! To ease your mind, remember this, you are roughing it after all. 😎
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FYI. People in ancient times already did this with pottery, “Believe It Or Not”!