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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>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.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Greenbuilding [mailto:greenbuilding-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>Clarke Olsen<br><b>Sent:</b> August-24-14 7:06 AM<br><b>To:</b> Green Building<br><b>Subject:</b> Re: [Greenbuilding] Ventilation for Unoccupied Tight Buildings<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It seems intuitive to leave some windows open, and let the building breath, dare I say it, naturally.<o:p></o:p></p><div><div><div><div><div><div><div><div><p class=MsoNormal style='margin-bottom:13.5pt'><span style='font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black'>Clarke Olsen<br><a href="http://clarkeolsendesign.com">clarkeolsendesign.com</a><br>373 route 203<br>Spencertown, NY 12165 <br>USA<br>518-392-4640<br><a href="mailto:colsen@taconic.net">colsen@taconic.net</a><br><br><br><o:p></o:p></span></p></div></div></div></div></div></div></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Aug 24, 2014, at 8:33 AM, "conservation architect" <<a href="mailto:elitalking@rockbridge.net">elitalking@rockbridge.net</a>> wrote:<o:p></o:p></p></div><p class=MsoNormal><br><br><o:p></o:p></p><div><div><div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>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 <o:p></o:p></span></p></div></div></div><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Helvetica","sans-serif"'>_______________________________________________<br>Greenbuilding mailing list<br>to Send a Message to the list, use the email address<br><a href="mailto:Greenbuilding@bioenergylists.org"><span style='color:purple'>Greenbuilding@bioenergylists.org</span></a><br><br>to UNSUBSCRIBE or Change your List Settings use the web page<br><a href="http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org"><span style='color:purple'>http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org</span></a><o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>