[Greenbuilding] Ventilation for Unoccupied Tight Buildings

John Salmen terrain at shaw.ca
Sun Aug 24 09:28:41 MDT 2014

Well that is one way of showing a low annual energy consumption for a passiv
haus building (turning off the ventilation). These are large buildings
probably around 400000 ft3 so even a .6 leakage is a lot of moist air
entering.  Dealing with that air humidity would/should mean doubling air
change rates and or drying the air. Windows could be effective for some air
movement but distribution in a large building? It does come down to
materials and the ability to deal with moisture if the intent is to have a
building lie dormant. Would love to see an air quality test for contaminants
for a tight building that is shut down for a few months - I feel sorry for
the returning students.


From: Greenbuilding [mailto:greenbuilding-bounces at lists.bioenergylists.org]
On Behalf Of Clarke Olsen
Sent: August-24-14 7:06 AM
To: Green Building
Subject: Re: [Greenbuilding] Ventilation for Unoccupied Tight Buildings


It seems intuitive to leave some windows open, and let the building breath,
dare I say it, naturally.

Clarke Olsen
373 route 203
Spencertown, NY 12165 
colsen at taconic.net


On Aug 24, 2014, at 8:33 AM, "conservation architect"
<elitalking at rockbridge.net> wrote:

I have learned of some problems with college dormitories of a Passiv Haus
building that was left unoccupied with not conditioned or ventilated with
ERV over the summer and got some molding problems.  I am wanting to inquire
about what the best practices are for unoccupied tight buildings.  Since
they are unoccupied, I would hope you could turn the energy consuming
machines off.  The humidity sources within the would be reduced, (breathing,
cooking, bathing, et.).  Although you would still have ambient humidity and
standing water of toilets.  Perhaps it would be a good practice to drain the
toilets.  This issue would be more significant in the Summer of high ambient
humidity.  I live in the mixed climate of Virginia.  However, I would be
interested in comments as it relates to other climates.  My question applies
to tight buildings that have active dehumidification (ac or dehumidifier)
and ERV, or no active dehumidification and HRV.   Eli  

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