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

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Does EnergyPlus support daylighting through internal windows in floors?
From: "lawrenceblount" <lawrenceblount@xxxxxxxxx>
Date: Tue, 28 Aug 2007 08:52:37 -0000
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Hi Rob,

Thank you for finding the bug.  I was beginning to think I was going 
around the bend.
Do windows in internal walls work okay?
How often are updates to the E+ released?

Cheers
Lawrence


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Rob Hitchcock 
<RJHitchcock@...> wrote:
>
> 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> 
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Follow-Ups:
- Re: [EnergyPlus_Support] Re: Does EnergyPlus support daylighting through internal windows in floors?
  - From: Don Shirey
- RE: [EnergyPlus_Support] Re: Does EnergyPlus support daylighting through internal windows in floors?
  - From: Crawley, Drury
- Re: [EnergyPlus_Support] Re: Does EnergyPlus support daylighting through internal windows in floors?
  - From: Rob Hitchcock

References:
- Re: [EnergyPlus_Support] Re: Does EnergyPlus support daylighting through internal windows in floors?
  - From: Rob Hitchcock

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