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Re: [EnergyPlus_Support] Problem with result Surface Ext Solar Incident[W/m2]
Unfortunately, the very detailed set of shading surfaces which represent the
adjacent buildings is causing version 1.2.0 to crash. These shading surfaces
describe all sides of the adjacent buildings. It may help to keep only the
shading surfaces which face the simulated building. The other shading surfaces
will not cast any further shadows. For example:
Replace this (view with a fixed-space font):
-------------
| Simulated |
| Building |
-------------
-----------
| Shading |
| |
| |
-----------
With this:
-------------
| Simulated |
| Building |
-------------
-----------
Shading
The version 1.2.1 shading algorithms are very different and can handle this
model as is, however computation time will be improved by eliminating any
unnecessary shading surfaces.
Mike
On 16 Aug 2004, at 18:09, sbtay_4@xxxxxxxxx wrote:
> Hi Mike,
>
> i did try changing it before but the simulation crush.
> Thanks anyway!
>
> Clarence
>
> --- "Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
>
> > Regarding the incident solar on the building. The
> > problem is with the
> > "TransSchedShadowSurf" field on the shading
> > surfaces. This schedule is the
> > transmittance of the shading surface, so a value of
> > zero is opaque and a value
> > of 1 is transparent. All of the shading surfaces
> > have a schedule of 1.0, so
> > the shading surfaces have no impact. Change the
> > schedule to be 0.0, and you
> > should see the impact of the change in height.
> >
> > Mike
> >
> >
> > On 14 Aug 2004, at 10:56, Linda Lawrie wrote:
> >
> > > At 10:46 AM 8/14/2004, Soon Boon (Clarence) wrote:
> > > >The Surface Ext Solar
> > > >Incident[W/m2] value came out to be unstable as i
> > change the vertex
> > > >direction. Meaning my surface geometry is key as
> > lower left corner CW
> > > >but when i key the vertex of the wall in a wrong
> > direction it give me
> > > >a different value.
> > >
> > > Yes, that is "as designed" -- if the surface is
> > facing a different
> > > direction (outward normal of the surface), then
> > you will quite likely get a very
> > > different result.
> > >
> > >
> > > >another problem was even when i got the right
> > direction of the
> > > >vertex, the value of 2nd floor compare to 13th
> > floor the value are
> > > >the same, which i think there should be a
> > different.
> > >
> > > Not sure that this one should be different --
> > depends on location,
> > > etc. Incident angle from the sun (which is a long
> > distance away) may make very
> > > little difference to a building between stories --
> > but we're certainly willing
> > > to look at it if you send your input file (to
> > linda@xxxxxxxxxx or to
> > > energyplus-support@xxxxxxxx)
> > >
> > >
> > > Linda
> > >
> > > EnergyPlus WebSite: http://www.energyplus.gov
> > > Owner: EnergyPlus_Support list
> > > Member: EnergyPlus Development Team
> > >
> > >
> > >
> > > [Non-text portions of this message have been
> > removed]
> > >
> > >
> > >
> > >
> > > The primary EnergyPlus web site is found at:
> > > http://www.energyplus.gov
> > >
> > > The group web site is:
> > > http://groups.yahoo.com/group/EnergyPlus_Support/
> > >
> > > Attachments are not allowed -- please post any
> > files to the appropriate folder
> > > in the Files area of the Support Web Site.
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support
> > EnergyPlus-Support@xxxxxxxx
> >
> >
> >
>
>
>
>
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> The primary EnergyPlus web site is found at:
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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