RE: [EnergyPlus_Support] Problem with Ventilation by Wind and Stack with Open Area

[Lixing Gu <gu@xxxxxxxxxxxx>]

I think you mean the variable of WindExt used in Qw calculation at
HVACManager.f90(2564):

Qw =
Cw*Ventilation(J)%OpenArea*GetCurrentScheduleValue(Ventilation(J)%OpenAreaSc
hedPtr)*WindExt

The WindExt is determined by the following line at HVACManager.f90(2394)
 
    WindExt = Zone(NZ)%WindSpeed

The Zone wind speed is determined by zone height at
HeatBalanceSurfaceManager.f90(281):
 
Zone(ZoneNum)%WindSpeed = WindSpeedAt(Zone(ZoneNum)%Centroid%Z)

Therefore, the wind speed used in the Ventilation by Wind and Stack with
Open Area object is a local wind speed.

Hope this helps.

Lixing 

-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of wanghaojie630
Sent: Wednesday, October 17, 2012 11:26 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Problem with Ventilation by Wind and Stack
with Open Area

I notice in the Engineering Reference the equation for ventilation by wind
and stack uses local wind velocity to calculate the ventilation rate by
wind, however, when I look into the source code for EP 7.1, the velocity
seems to be the external wind velocity， which means it is the
velocity at 10m height. So I wonder if I miss something or the code might be
wrong?



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