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

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

I believe they are under the user's control.  Ref: object: 
Site:WeatherStation

That object forms the basis of all the WindSpeedAt calcs.

On 2012-10-17 14:15, ecoeficientees wrote:
> Just to comment, I tell you from memory but if I am not wrong Wind
> Speed at a height is calulated using Suburban profile. I don't know
> why this is fixed and doesn't let to use open country or urban
> profiles...
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Lixing Gu <gu@...> wrote:
> > 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&#65292; 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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