[Bldg-sim] Condensation in heritage buildings - best practice

[Justin Spencer]

Another option is to think about the DOAS route.  This may lower the cost of
providing dehumidification of the outdoor airstream, if you're trying to
maintain a dewpoint indoors that is lower than the dewpoint outdoors under
some conditions.



On Tue, Dec 2, 2008 at 11:25 AM, Daly, Matt <Matt.Daly at wesd.org> wrote:

> Just some thoughts on HVAC basics.  Depending on what can be done with your
> heritage building....Increased R-value of the exterior walls will move the
> dew point to within the wall.  Combine this with a vapor barrier - a good
> coat of paint and sealing to prevent conditioned air from entering the wall
> cavity - and the temperature of the inside surface of the wall is above the
> dew point.  Efficient glazing will decrease condensation on the windows, but
> prepare for the inevitable condensation anyway.  A dedicated dessicant
> system after the mixed air, assuming an air handling system exists or can be
> installed, would be another or additional method, and would help prevent
> condensation within the wall cavity which will happen to some extent
> regardless of how well your walls are sealed.
>
>
> Matt Daly
> Willamette ESD
>
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