I did a bit of calculating about what might push damp air into a conduit.
I assumed that I had 30 meters (100ft) of a 2" diameter tube where there
was a pressure difference corresponding to a 10 mi/hr wind (it's about
1/4 lb/sq ft)
You'd get a flow of about 2 liters/second (which is surprisingly high)
In an hour, then you'd have 7200 liters. If you had 100% humidity air
at 68F (20C) going in, and the soil was at 50F (10C), you'd be
condensing out about 50 grams/hour.
In reality, you probably don't have 100% humidity at 68F. But you might
have 50% humidity at 85F, and that's about the same amount of water.
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