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Science Forum Index » Environment Forum » Solar powered air conditioning
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| Author |
Message |
| Dr. Convection |
 Posted: Sun Dec 21, 2003 3:16 pm |
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Guest
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In the event of sudden and catastrophic global warming, the people of the
earth could be saved by solar powered air conditioning.
From:
http://techref.massmind.org/techref/other/spac.htm
There was a technique used or invented by the Romans a long time ago. A
natural form of air conditioning / ventilation was used roughly as follows:
A trench 6 to 12 feet deep and 100 to 200 yards long was dug leading from
the "house" in a straight line away from the house.
Into this trench a large diameter pipe (these days corrugated drainage pipe
2 or 3 feet diameter) was laid, with holes drilled into the bottom to drain
water that condensed inside the pipe. The trench was then covered over.
At the far end a 90 degree elbow was attached and more pipe added so that it
reached above ground and the end covered with some sort of wire mesh
attached to keep out unwanted things such as rodents, etc., and then another
elbow could be added at this end to shield against rain.
The house end of the pipe entered the house and was the source of incoming
air.
The key to making this work is to add a convection chimney.
The Convection chimney is built such that it's inside opening is at a high
point inside the building.
On the outside, two intersecting sides of the chimney; are painted flat
black, and the resulting V formed by the two connecting sides face south. In
other words, the V needs to face the mid point between where the sun rises
and sets.
The two other sides must be transparent, Plexiglas or some equivalent. Also,
the higher/larger the chimney, the better.
How it works: the sun heats up the chimney causing the air inside to rise,
thus drawing air through the cool pipe. The pipe cools the air drawn from
the outside to the temperature of the earth at the depth at which it is
buried (which is virtually constant year around at this depth). By the way,
an interesting note: Even in cold climates where the ground is frozen, the
incoming air is only 32F when the air outside may be much colder, we need
only heat the air by 38F to bring it to 70F; as opposed to heating outside
air of say -15F to 70F we would have to heat the incoming air by 85F - quite
a difference in the amount of heating energy we would have to supply by some
other means.
Of course, without the sun to warm the chimney (or some other source) the
system isn't worth fooling with. |
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