Electricity-free refrigeration

The technique is thousands of years old. The Australian version is the Coolgardie safe:

It’s a wire mesh cage with damp cloth on its outside. As long as you keep the cloth damp, and the air is not 100% humid, the contents keep as cool as in an electric fridge.

Other versions use the same principle with unglazed clay pots, kept damp. Ilana Strauss describes a version that will work for a considerable time without needing attention: a large pot holds a smaller pot, with sand in between. You wet the sand, and fill the inner pot with food.

Given that 15% of electricity use is for refrigeration in the typical home, this is a good trick to keep in mind. And when the grid fails, it still keeps working.

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About Dr Bob Rich

I am a professional grandfather. My main motivation is to transform society to create a sustainable world in which my grandchildren and their grandchildren in perpetuity can have a life, and a life worth living. This means reversing environmental idiocy that's now threatening us with extinction, and replacing culture of greed and conflict with one of compassion and cooperation.
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3 Responses to Electricity-free refrigeration

  1. Awesome! It reminds me of ice boxes my grandmother had.
    Never Give Up
    Joan

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