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

["Jean marais" <jeannieboef@xxxxxxxxx>]

That answer is good, but now I should build in a fan to pressurize my building to 50 Pa and monitor what volume flow is reported, gradually increasing the parameter you suggested until the volume flow equals 0.3 ACH for the building which reflects a realistic building envelope sealing? 

I guess what I'm saying is that even with knowing which parameters will increase or decrease the infiltration rates, I still have no idea how to set up the system to reflect a real life realistic infiltration character of the building. 

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Lixing Gu <gu@...> wrote:
>
> 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. 
> 
> ----------------------------------------------------------------------------
> ---
> 
> 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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