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Re: Furnace Chimney "bleeds" water thru brick

Posted By: joe
Monday, 31 January 2000, at 4:12 p.m.

In Response To: Furnace Chimney "bleeds" water thru brick (Jon Golli)

You answered your own question: it IS condensation.

Trouble is that marginal differances in air/humidity levels and dew point to surface temps will cause condensation.

Let's argue this out.

Let's say that 1 cubic foot of air at 100 degrees F and 10psi can carry 2 gallons of water. (I don't know if these are the actual numbers, it's just an argument)

So that 100 degree 1 cubic foot of air can carry 2 gallons of water UNLESS:

A) The temperature changes... temp going up means that volume of air can carry MORE water vapor.... temp going down means that volume of air can carry LESS water vapor...

So if the temp DROPS, condensation occurs...

B) This also means that if the pressure changes similar things occur....ie...lower pressure with a temp constant means that condensation will occur even if the temp is the same...or means that higher pressure with a constant temp will carry more water vapor....

Bottom line here is that IF the brick is COLDER than the air going up it, whatever moisture in the air going up the chimney can and will condense on the inside of said chimney.

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