I've already started on this one. Renovating an old house, I decided to
put in a cool duct to lead to a cooling cupboard for fruit and
vegetables. This should mean I can downsize the refrigerator, and
hopefully phase it out eventually once I set up a pot in pot fridge to
keep the milk cold. (
http://en.wikipedia.org/wiki/Pot-in-pot_refrigerator)
I have set up a 6m long terracotta pipe, 230mm in diameter. It runs to
bottom of the cool cupboard from below the floor in the coldest part of
the house(southern side in the southern hemisphere) and is partially
earth buried, which I hope will aid in cooling the air. The plans I
found suggest a minimum of 300mm diameter pipe of any material, but
this size was just too big for me to manage. The cupboard when built
will be insulated, with wire baskets holding food and allowing air to
pass through. Air will be drawn up through the cupboard by a spinning
vent. This may stretch the definition of powering something, but it
through utilising passive cooling techniques, it will dramatically cut
down on energy use in my household.
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