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Re: [EnergyPlus_Support] Re: Does EnergyPlus support daylighting through internal windows in floors?

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Re: Does EnergyPlus support daylighting through internal windows in floors?
From: Rob Hitchcock <RJHitchcock@xxxxxxx>
Date: Mon, 27 Aug 2007 10:26:09 -0700
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Lawrence,

I have found a bug in the code related to this issue.  The problem, as 
you deduced, is that the mere presence of an interior window causes beam 
solar to be added to reference point, and illuminance map point, 
illuminance totals, even if there is not an unobstructed line of site 
from the reference point to the sun.

Thank you for bringing this to our attention.  We will get a fix into 
the upcoming release.

Rob Hitchcock
=========
lawrenceblount wrote:

> Even if you are not sure why I getting beam solar through the opaque
> midfloor, could anyone suggest some changes that I could try?
>
> Kind regards
> Lawrence
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx 
> <mailto:EnergyPlus_Support%40yahoogroups.com>, "lawrenceblount"
> <lawrenceblount@...> wrote:
> >
> > Hi Rob,
> >
> > I am keen to learn what you find out.
> > Cheers
> > Lawrence
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx 
> <mailto:EnergyPlus_Support%40yahoogroups.com>, Rob Hitchcock
> > <RJHitchcock@> wrote:
> > >
> > > Lawrence,
> > >
> > > Sorry for the delay. There does seem to be something puzzling
> > here.
> > > I'm looking into it further.
> > >
> > > Rob
> > > ========
> > > lawrenceblount wrote:
> > >
> > > > Hi Rob,
> > > >
> > > > Thank you for your comments.
> > > >
> > > > The issue I have is that the direct beam solar is actually
> passing
> > > > through the midfloor not where the window is placed. The window
> is
> > > > 900mm deep and placed near and along the south wall. I can
> clearly
> > > > trace the high intensity light spots from the skylights through
> > the
> > > > opaque part of the midfloor down onto the lower floor.
> > > >
> > > > Cheers
> > > > Lawrence
> > > >
> > > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx 
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > > <mailto:EnergyPlus_Support%40yahoogroups.com>, Rob Hitchcock
> > > > <RJHitchcock@> wrote:
> > > > >
> > > > > Lawrence,
> > > > >
> > > > > I'm not sure what you think is wrong with what you are
> seeing.
> > If
> > > > I
> > > > > correctly understand your description below, with an internal
> > > > window in
> > > > > the floor between the upper zone with skylights and the lower
> > zone,
> > > > you
> > > > > see light transmitted between the zones. Without the internal
> > > > window
> > > > > you do not see light transmitted between the zones. Isn't this
> > > > what you
> > > > > would expect?
> > > > >
> > > > > Rob
> > > > > ========
> > > > > lawrenceblount wrote:
> > > > >
> > > > > > Hi Mike and all,
> > > > > >
> > > > > > Thank you for your comments.
> > > > > >
> > > > > > I have uploaded a folder named "Midfloor window" with 3 idf
> > and my
> > > > > > weather file. The names are hopefully self explanatory. If
> I
> > open
> > > > > > the *MAP.csv files and generate a surface in Excel for 1
> > January
> > > > at
> > > > > > 10am, I get light spots on the lower floor from the
> skylights
> > when
> > > > > > the midfloor window is present. If I use the file without
> the
> > > > > > midfloor window (the only change), I only get the lighting
> > from
> > > > the
> > > > > > lower level north window. The idf is setup to output the
> dxf
> > file
> > > > > > for you to view my model.
> > > > > >
> > > > > > I really appreciate if anyone can see where I have gone
> wrong.
> > > > > >
> > > > > > Thanks
> > > > > > Lawrence
> > > > > >
> > > > > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx 
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > > <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > > > > <mailto:EnergyPlus_Support%40yahoogroups.com>, "Michael J.
> > Witte"
> > > > > > <mjwitte@> wrote:
> > > > > > >
> > > > > > > If you want to transmit solar from one zone to another,
> you
> > must
> > > > > > use a pair of
> > > > > > > interior windows as you suggest. This will transmit both
> > beam
> > > > and
> > > > > > diffuse
> > > > > > > between zones, but once the solar enters the second zone
> it
> > is
> > > > all
> > > > > > treated as
> > > > > > > diffuse. Search the Input Output Reference for "interior
> > window"
> > > > > > for more
> > > > > > > information.
> > > > > > >
> > > > > > > The amount of solar transmitted from the attic zone to
> the
> > zone
> > > > > > below should be
> > > > > > > proportional to the size of the interior window, and the
> > > > remaining
> > > > > > attic floor
> > > > > > > area should be opaque. If you are seeing something other
> > than
> > > > > > this, please
> > > > > > > upload input files to the yahoo files area or send zipped
> to
> > > > > > energyplus-
> > > > > > > support@
> > > > > > >
> > > > > > > Mike
> > > > > > >
> > > > > > >
> > > > > > > On 13 Aug 2007 at 9:36, lawrenceblount wrote:
> > > > > > >
> > > > > > > > Hi,
> > > > > > > >
> > > > > > > > I am fairly new to EnergyPlus, although I have used
> > Ecotect
> > > > and
> > > > > > Tas
> > > > > > > > before.
> > > > > > > > I have a light well that is effectively a window in the
> > floor
> > > > of
> > > > > > an
> > > > > > > > attic space. The attic has some skylights.
> > > > > > > > I am finding that when I add a matching pair of windows
> > to the
> > > > > > internal
> > > > > > > > ceiling and floor objects that the whole midefloor
> becomes
> > > > > > transparent
> > > > > > > > to direct solar. If I remove the internal windows the
> > midfloor
> > > > > > then
> > > > > > > > becomes completely opaque.
> > > > > > > >
> > > > > > > > I would like comments as to whether I am likely to be
> > making
> > > > some
> > > > > > > > errors or this function is outside the capability of
> E+.
> > The
> > > > > > capability
> > > > > > > > is available in wall elements.
> > > > > > > >
> > > > > > > > Cheers
> > > > > > > > Lawrence
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > The primary EnergyPlus web site is found at:
> > > > > > > > http://www.energyplus.gov <http://www.energyplus.gov> 
> <http://www.energyplus.gov <http://www.energyplus.gov>>
> > > > <http://www.energyplus.gov <http://www.energyplus.gov> 
> <http://www.energyplus.gov <http://www.energyplus.gov>>>
> > > > > > > >
> > > > > > > > The group web site is:
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- [EnergyPlus_Support] Re: Does EnergyPlus support daylighting through internal windows in floors?
  - From: lawrenceblount

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