[EnergyPlus_Support] Re: Does pressure coefficient affects on the closed openings?

["tobiasschulzeoooitu" <tobias.schulze@xxxxxxxxxxxxxx>]

If you dont want to see the effect of infiltration (100% tight) for your closed win, you could just not define the windows and surfaces in the AFN I think. Or you set the Cp to zero. If that is realistic...


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Lixing Gu <gu@...> wrote:
>
> The wind pressure coefficients are used to calculate wind pressures on all
> exterior surfaces. The exterior surfaces can have either operable windows or
> closed windows. Therefore, you have to apply wind pressure coefficients to
> all windows, no matter what are operable or closed. 
> 
> -----Original Message-----
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Wonjun
> Sent: Sunday, June 05, 2011 4:34 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Does pressure coefficient affects on the
> closed openings?
> 
> Hello fellows 
> When I use Airflow network class, I should enter the wind pressure
> coefficient for all the windows.
> But in my model, most of windows are fixed(closed) and only some of them are
> operable. 
> I calculated pressure coefficient values using CFD only for the operable
> windows. 
> I suddenly wonder that pressure coefficient affects on the closed
> windows(fixed windows). 
> I think when the opening is close, airflow rate can be calculated using
> empirical power-law fomula. So the pressure coefficient is not used. But can
> not sure what I thought is right or not. 
> If my thoght is right, I can skip caculating all the pressure coefficient
> such a time consuming thing.
> 
> I hope that someone give me advice regarding this matter. 
> Thanks in advance.
> 
> Regards.
> 
>  
> 
> 
> 
> 
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