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[–] QualityShitposter 2 points 5 points (+7|-2) ago 

Suction, just like your sister's ass.

Air contracts underground, then heats up as it rises through the house. Both of these pull air through the system. Having the upper window downstream helps improve efficiency, but it could also use a simple flue design.

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[–] StuffThatSandwich 0 points 12 points (+12|-0) ago 

The opening is placed facing the same direction as the wind typically travels (apparently some wind towers can change which side is opened too), this sucks air out the top, which in turn sucks air through the hole in the ground.

https://en.wikipedia.org/wiki/Windcatcher#Function

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[–] Thissandwich 0 points 2 points (+2|-0) ago 

Okay. I see the water canal now. That makes more sense.

[–] [deleted] 2 points 14 points (+16|-2) ago 

[Deleted]

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[–] SpeshulSnowflaek ago 

Correct. This device is a giant carburetor, except instead of fuel, it pulls cool air.

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[–] Thissandwich 0 points 2 points (+2|-0) ago 

That makes sense. I see the water canal now.

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[–] awwisnotafarmpromise 0 points 3 points (+3|-0) ago 

No.

Venturi is caused by reduction in size of port.

These towers use simple redirection and/or the Coanda Effect. Temperature gradients.

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[–] KILLtheRATS 0 points 2 points (+2|-0) ago 

Yep. The hot air rising up the tower causes a suction