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Old Jun 2nd 2017, 01:14 AM   #1
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Electricity free Air cooling ???

There are a few videos on Youtube of people installing what they believe to be AC units ... It consists of a bank of cut off water bottles large diameter outside , a breeze enters the the bottle , exits through the narrow top inside the house at higher speed , they claim this reduces the temperature by 10*C , I don't believe it can work ...

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Old Jun 2nd 2017, 05:53 AM   #2
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No, it won't work, as there is nothing in this system to remove heat from the incoming air. Also the idea that the air velocity increases as it passes through the bottle is misleading - yes its true that conservation of mass flow says that the velocity out is greater than the velocity in, but left unstated is the fact that the velocity into the bottle is less than the ambient wind velocity. This is because the narrowing of the bottle walls creates a constriction that hinders air flow into the bottle. So the cooling effect of the natural wind is reduced by this set up.
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