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Posted by udarrell on October 7, 2006, 10:58 am
Steve Scott wrote:
> <>Is there any heat gained or lost through the uninsulated duct? IOW,
> is the temp of the air in the duct higher or lower than the
> environment it's in? Almost certainly the answer is yes. So, yes,
> the duct should be insulated and sealed. If the exposed portion isn't
> sealed I'd strip the insulation off the rest of it and seal and
> insulate the whole thing.
>
> It may be common to not insulate it, but that doesn't make it right.
> The return air is maybe 80 degrees and the attic 120 or higher.
Right-on Steve, - the temp split could be even more, like 130 or 140-F
to 72-F.
The larger the temp differential the more heat transferred.
In the winter the opposite situation also needs the insulation.
Also, on the off cycle the air in the duct could be a heat-overload on
the A/C system.
- udarrell
--
Air Conditioning's Affordable Path to the "Human Comfort Zone Goal"
http://www.udarrell.com/airconditioning_eer_ratings_over_seer_ratings_central_systems.html (Solving ESP)
http://www.udarrell.com/udarrell-air-conditioning.html
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