RE: [EnergyPlus_Support] AFN - how to set up air tightness of envelope

[Lixing Gu <gu@xxxxxxxxxxxx>]

If the AirflowNetwork:MultiZone:Component:DetailedOpening objects are used,
you may adjust the values of the Air Mass Flow Coefficient When Opening is
Closed field.

Hope this helps.

Lixing

-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jean marais
Sent: Thursday, October 27, 2011 2:09 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] AFN - how to set up air tightness of envelope

Design Builder has generated me a wonderfully large AFN. As default, all my
windows are closed all the time.

1) How do I realistically define an "air tightness" for windows that don't
open?
2) For windows that do open, but are closed.

using AFN object fields such as minimum crack opening factor, etc. 

----------------------------------------------------------------------------
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I'm thinking of increasing the minimum crack width untill my zones are
reporting infiltration rates of about 0.35 ACH (well sealed building).
Then I can add extra infiltration by playing with the openable windows and
their schedules. 



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