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

[Daly, Matt]

Hmm, and combine this with HRV (heat recovery ventilation) - without mixing the air streams - to maximize energy savings.  Protect your building and save energy $.

Matt Daly
Willamette ESD

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Justin Spencer
Sent: Tuesday, December 02, 2008 10:34 AM
To: Building Simulation
Subject: Re: [Bldg-sim] Condensation in heritage buildings - best practice

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<mailto: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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