How to Build a Solar Powered Fridge / Refrigerator

solar windHow to Build a Solar Powered Fridge

How to Build a Solar Powered Fridge

Welcome to this information page of Mppt Solar. On this page we are going to teach you how to build an innovative portable fridge powered directly by the sun, without the use of electricity. This is a recent invention, born from the ingenious intuition of a young graduate from Leeds University, Emily Cummins. The solar powered refrigerator does not use electricity and can also be built at home, as we only need common construction materials. It is widely used in Third World countries for the refrigeration and storage of medicines, foods and beverages, thus avoiding the use of refrigerants powered by the pollutant kerosene-generators and propane.

Composition and Principle of Operation:

The solar-powered fridge, also named Sustainable Refrigerator, is made up of two metal cylinders, one inside the other one, separated only by organic material such as sand or wool. Sand or wool should be enclosed in a filter and soaked in water. Naturally, it is also possible to use materials other than sand and wool, depending on the availability of the place where the solar fridge is used. The outer cylindrical pipe must be drilled, and it can also be made of plastic or wood. The inner cylinder should not be drilled in order to ensure that the contents remain dry. Finally, the last piece that makes up our solar fridge is a metal rod with, at the ends, two metal disks that perform the function of closing the fridge.

Components of the solar fridge

Well, let's see how it works. The operating principle of this solar powered fridge is as simple as surprising. Once our fridge is exposed to sunlight, the water in the sand or wool (3) will begin to evaporate outwardly through the holes of the larger cylinder (1). This results in a heat flow to the outside (4) and this results in a reduction in heat on the surface of the inside cylinder (2) in which we have put our foods or our drinks. Thanks to this heat reduction, this refrigerator is able to reach easily a temperature of 6 degrees centigrade. It's good to say that rainwater or dirty water can also be used since the contents of the inner cylinder will never touch the water. The content will always be kept dry and hygienic. If the water is almost completely evaporated, to continue the cooling of the solar fridge, simply add more water, and the whole thermodynamic cycle resumes.

Previous Model:

This fridge is the improved version of the old model invented by the Nigerian Mohammed Bah Abba. The old model consisted of two terracotta pots, put one in the other and separated by wet sand. This system worked fine but in the interior vessel we had a temperature decrease of only a few degrees centigrade compared to the temperature of the surrounding environment. The electricity-free fridge of Emily Cummins, conversely, allows to reach the temperature of 6 degrees centigrade without any difficulty.

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