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<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Hmm, and
combine this with HRV (heat recovery ventilation) – without mixing the
air streams – to maximize energy savings. Protect your building and
save energy $.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><i><span style='font-family:"Arial","sans-serif";color:black'>Matt
Daly <o:p></o:p></span></i></p>
<p class=MsoNormal><i><span style='font-family:"Arial","sans-serif";color:black'>Willamette
ESD</span></i><span style='font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Justin
Spencer<br>
<b>Sent:</b> Tuesday, December 02, 2008 10:34 AM<br>
<b>To:</b> Building Simulation<br>
<b>Subject:</b> Re: [Bldg-sim] Condensation in heritage buildings - best
practice<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'>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. <br>
<br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal>On Tue, Dec 2, 2008 at 11:25 AM, Daly, Matt <<a
href="mailto:Matt.Daly@wesd.org">Matt.Daly@wesd.org</a>> wrote:<o:p></o:p></p>
<p class=MsoNormal>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.<br>
<span style='color:#888888'><br>
<br>
Matt Daly<br>
Willamette ESD</span><o:p></o:p></p>
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