[Greenbuilding] Ventilation for Unoccupied Tight Buildings

Matt Dirksen dirksengreen at gmail.com
Mon Aug 25 10:45:21 MDT 2014


I'd be curious to know where the mold grew. That could potentially lead to
a more scale-able and localized solution instead of trying to solve it from
a 20,0000 ft. level.


On Sun, Aug 24, 2014 at 1:24 PM, John Salmen <terrain at shaw.ca> wrote:

> Thats the problem – not sure if trite and trendy go together all that well
>
>
>
> *From:* Greenbuilding [mailto:
> greenbuilding-bounces at lists.bioenergylists.org] *On Behalf Of *Norbert
> Senf
> *Sent:* August-24-14 9:48 AM
>
> *To:* Green Building
> *Subject:* Re: [Greenbuilding] Ventilation for Unoccupied Tight Buildings
>
>
>
> Not to be trite, but why not put a controller on the ERV system to turn it
> on once a day, or some other interval determined through testing,  and
> change the air?......Norbert
>
>
>
> On Sun, Aug 24, 2014 at 11:28 AM, John Salmen <terrain at shaw.ca> wrote:
>
> 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
> clarkeolsendesign.com
> 373 route 203
> Spencertown, NY 12165
> USA
> 518-392-4640
> 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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>
>
> --
> Norbert Senf
> Masonry Stove Builders
> 25 Brouse Road, RR 5
> Shawville Québec J0X 2Y0
> 819.647.5092
> www.heatkit.com
>
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