Talk:Directory:Abba Pot-in-Pot Cooling System
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Discussion page for Directory:Abba Pot-in-Pot Cooling System
Directory:Refrigeration > Directory:Abba Pot-in-Pot Cooling System - Nigerian inventor, Mohammed Bah Abba's award-winning, simple-to-implement invention of and evaporative cooler, consisting of one pot inside another, with wet river sand in between and a damp cloth on top. When kept in a dry, well-ventilated, and shady location, water evaporates, cooling the inner container. (PESWiki Apr. 15, 2008)
Comments
Uses heat of sublimation Was used in US long ago
On April 10, 2008, David Allan (Congress:Founder:Sterling D. Allan's father) wrote:
This uses the heat of sublimation (120 calories per gram in reverse). [My grandmother Carrick] used to have a similar refrigerator. It was on the north side of a big lilac bush by the door to her kitchen. It was a wooden box with a burlap sack hanging over the front. She had a water hose dripping on the top of the burlap. The water would wick down over the face of the shelves in the box, and as the water evaporated it would cool the air behind the burlap i.e. the inside air where the milk and other things were kept cool.
The old canvas water bag works on the same principle. Dry, warm air over the face of the material causes the evaporation. In other words, it would not work in a high humidity situation e.g. the humid jungle.
The eutectic salts we are using in our home use a similar idea -- the heat of fusion (80 calories per gram in Glauber's salts). I designed the addition to our farm home down the road to use this for heating in the winter and for cooling in the summer. These are called phase-change phenomena liquid (water) to vapor solid to liquid or liquid to solid. Most of the temperature control of the body is also the reverse of the heat of sublimation you sweat and it evaporates. That is how a warm breeze can feel so cooling if you have water on you skin.
Upon looking at it, his refrigerator would work even better if the outer pot were canvas instead -- to hold the sand and to give more surface area for evaporation. They probably don't have access to canvas, but here, it would be easier to make and would be less costly in terms of labor.
Better if outer pot were canvas
On April 10, 2008, David Allan (Congress:Founder:Sterling D. Allan's father) wrote:
Upon looking at it, his refrigerator would work even better if the outer pot were canvas instead -- to hold the sand and to give more surface area for evaporation. They probably don't have access to canvas, but here, it would be easier to make and would be less costly in terms of labor.
Burlap on barrel with slow-leak can of water on top
On April 11, 2008, Jack Martindale wrote:
We used a similar refrigerator to the one Mrs Carrick used when out on the farm. Ours was a large wooden barrel with a shelf inside. Burlap was hung all around the barrel with a large can of water on top of it. The can had very small holes in it so the water would leak out to keep the burlap wet.
Crate with burlap over it, water pan with hole on top
On April 11, 2008, Ranae Lee wrote:
> My mom said this is what they did when she was a child. They had an old
> crate that hung in a tree, with burlap over it and a pan on top of the
> burlap. The pan had a hole in it, so when filled with water it leaked and
> kept the burlap wet. Then the evaporation factor kept their milk and eggs
> cool. Good stuff to know.
See also
Directory:Abba Pot-in-Pot Cooling System
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Directory:Evaporative Cooling - Directory of technologies and methods of using evaporative cooling for non-electric refrigeration.
Directory:Home Generation:Air Conditioning
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