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Re: [EnergyPlus_Support] "Surface Ext Solar Incident" (w/m^2)
Thanks Mike for the quick reply - yes, I agree that the values should have been
the same. Just thought that if this output was defined somehow else in
EnergyPlus the only explanation for the results could have been that the
absorptance of the surface was important.
Anyway, not so important/urgent for me right now.
Thanks again.
Georgios
Quoting "Michael J. Witte" <mjwitte@xxxxxxxx>:
> I agree that one would expect the same value for incident solar [w/m2] for an
>
> unshaded base surface and its subsurface. The values of absorptance (thermal
>
> or solar) should have no impact. This is reporting the solar that is
> incident
> on the surface, not the amount that is absorbed.
>
> I have been testing this with several different files. One of the files
> shows
> exactly the same incident solar on base and subsurfaces, other files show
> very
> tiny differences, and others show a more significant difference. At this
> point, I have no answer whether this is an input issue or an algorithm
> issue.
>
> Mike
>
>
> On 14 May 2006 at 18:22, Georgios Kokogiannakis wrote:
>
> > Hi all,
> >
> > I run an annual simulation for a building and then looked at my "Surface
> Ext
> > Solar Incident" (w/m^2) average annual results. For 2 vertical (opaque)
> > surfaces
> > that have the same orientation and nothing shades them (e.g. an external
> door
> > on
> > an external wall) I was expecting to get results that are only different
> > because
> > of their (external) thermal absorptance. However, it seems that this is
> not
> > the
> > case - am I considering something wrong here?
> > For example:
> > -External West wall with 0.5 (external) thermal absorptance gets average
> > 51.84
> > w/m2 incident solar radiation
> > &
> > -External West door with 0.65 (external) thermal absorptance gets average
> > 55.31
> > w/m2 incident solar radiation
> >
> > I would appreciate any help so that I make this clear.
> > Thanks.
> >
> > Georgios
> >
> >
> >
> >
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> >
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> >
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> >
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> the
> > "search" button.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
>
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@xxxxxxxx
>
>
>
>
>
>
> 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
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>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf and press the
> "search" button.
>
> Yahoo! Groups Links
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