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Condensation
Posted by HKestenholz on January 26th, 2005 12:12 PM
In reply to Harold - Question ... by Jay J on January 26th, 2005 11:25 AM [Go to top of thread]
"condensing-out on the warm/hot vent-duct, and dripping on to your ceiling."
The concept must align with physics. That is: warm, moist air condenses on COLDer surfaces that are below the dew point. Moisture does not condense on surfaces warmer than the dew point, which is often 50F in winter homes.
If the complaint is that moisture appears at all times of the year, then the hot, moist air that is suppose to be venting would be would be condensing INSIDE the vent(perhaps gathering and dripping down in one place) due to being surrounded by air cold enough inside the ceiling to keep the vent cold, a most unlikely prospect as the air vented by a dryer is usually hot enough to keep the vent at least at body temperature. Air getting into the ceiling to be cold enough to make water condense inside the vent would be another issue for repair. The ceiling itself would drip water from being cold as drywall is a terrible insulator.
The most likely account is that the outdoor terminator is conducting heat away and/or outdoor minus-30F air is getting into the vent to bring it below the deew point where warm indoor air is condensing water on the outside of the duct to drip down.
Your point that insulating it might help if that is done while assuring that moisture can not get within the additional insulation to soak it. Yet, that is an unusual suggestion for dryer venting that is rarely done in normal practice; however, minus-30 air is unusual for most of the nation and might in itself have some merit.
www.heatpro.info heat/cool right-sizing
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