Re: [EnergyPlus_Support] Re: BlockBeamRadiation

[Rob Hitchcock <RJHitchcock@xxxxxxx>]

Hi Lorenzo,

The solar profile angle is "the angle of incidence in a plane that is 
perpendicular to the window plane and to the direction of the slats."  
The profile angle accounts for the combination of solar altitude and 
azimuth, and window and slat orientation.  Looking only at the solar 
altitude will not give the proper angle of incidence for varying window 
and slat orientations.

Rob
=========
lorenzomattarolo wrote:

> Hi Rob,
>
> thanks for your answer.
> When you skecth the angle you said you considered "solar horizontal
> profile angle". But shouldn't we use "solar altitude angle" to check
> if the direct radiation is blocked by the slats?
>
> Which is the difference between the two outputs? I read the manual but
> i can't understand the difference...
>
> Many thanks
>
> Lorenzo
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx 
> <mailto:EnergyPlus_Support%40yahoogroups.com>, Rob Hitchcock
> <RJHitchcock@...> wrote:
> >
> > Lorenzo,
> >
> > The blind slat angles under this control strategy also seemed
> > non-intuitive to me at first. However, when I took the time to
> manually
> > sketch the blinds for a few time steps at the output "Window Blind Slat
> > Angle", and sketch the "Solar Horizontal Profile Angle", I convinced
> > myself that the resulting blind angles are correct. Note that this
> slat
> > angle is calculated to block direct transmission of beam solar, but it
> > is not intended to block diffuse reflection of that beam solar from the
> > blind slat surfaces into the zone.
> >
> > Rob
> > =============
> > lorenzomattarolo wrote:
> >
> > > Hi
> > >
> > > I'm trying to simulate external window blind with the shading control
> > > "block beam solar".
> > > I obtained some strange results looking at the angle of the slats in
> > > the output: the angle varies but not in the extent it should do to
> > > block completely the direct radiation (e.g. in the morning slats are
> > > horizontal when they should be almost vertical...)
> > >
> > > Have you ever found similar problems?
> > > Maybe I'm missing something, but i don't tealize what.
> > >
> > > Many thanks,
> > >
> > > Lorenzo
> > >
> > >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>  





[Non-text portions of this message have been removed]



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