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Re: [EnergyPlus_Support] Daylighting

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Daylighting
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Tue, 4 Nov 2003 08:36:29 -0600
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In EnergyPlus, the daylighting reference points are shown in the dxf 
drawing file.  To create this file, add "REPORT,Surfaces,DXF;" to 
your idf file.  If you do not have software which will view a dxf 
format drawing file, VoloView Express is available for free at 

http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=2753004

For an example, see ExampleFiles\DaylightingDeviceTubular.idf  It 
uses two reference points in each daylighting zone.  The first 
reference point is shown as a red circle, the second as a blue circle.

Mike


On 4 Nov 2003, at 0:52, Joe Huang wrote:

> Peter,
> 
> I believe the drawing tool that Mike was referring to is DrawBDL,
> developed by yours truly. For more information, please see
> www.drawbdl.com.  The EnergyPlus *.idf  reader is still in Beta form
> and currently does not read daylight reference points. This will be
> added shortly as a outgrowth of this e-mail exchange.
> 
> Joe Huang
> 
> ----- Original Message -----
> From: "Peter G Loutzenhiser" <post@xxxxxxxxxxx>
> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Sent: Monday, November 03, 2003 6:55 PM
> Subject: Re: [EnergyPlus_Support] Daylighting
> 
> 
> > At 08:51 PM 11/3/2003, Peter G Loutzenhiser wrote:
> > >Mike:
> > >
> > >Do you know the specific name of the drawing tool you were
> > >describing for DOE2.1E?  Also is it possible to locate the
> > >reference point in the output file for E+?
> >
> >
> >
> >
> > >Thanks
> > >Peter
> > >
> > >At 03:41 PM 11/3/2003, you wrote:
> > >>The problem is in the DOE-2 input.  The DOE-2 and EnergyPlus
> > >>daylighting reference points appear to be in the same place at
> > >>first glance.  In both programs they are relative to the zone
> > >>origin and the values are equivalent in the two input files. 
> > >>However, the DOE-2 input has zone origins of 0,0,0 and the
> > >>EnergyPlus input does not. It is a very subtle difference between
> > >>the two runs - it took two sets of eyes to find the problem at
> > >>this end.
> > >>
> > >>Since your DOE-2 file is essentially set up in global coordinates
> > >>(with all zone origins at 0,0,0), you will need to reposition the
> > >>lighting reference points in DOE-2 to be consistent.  There is a
> > >>handy drawing tool available for DOE-2 which shows the daylighting
> > >>reference points and revealed the problem.
> > >>
> > >>Mike
> > >>
> > >>
> > >>
> > >>On 21 Oct 2003, at 14:51, Michael J. Witte wrote:
> > >>
> > >> > My apologies for the delayed response.  We have not had any
> > >> > similar complaints.  Are you sure that you daylighting
> > >> > reference points are consistent?  Remember that daylighting
> > >> > reference points in EnergyPlus are always relative to the zone
> > >> > origin.  If you cannot resolve this, please send us more
> > >> > details including inputs and outputs.  You may post files to
> > >> > the yahoo group files area or send as a zipped attachment to
> > >> > energyplus-support@xxxxxxxx
> > >> >
> > >> > Mike
> > >> >
> > >> > On 13 Oct 2003, at 21:23, Peter G Loutzenhiser wrote:
> > >> >
> > >> > > I am running an Energy Plus Model against and validated
> > >> > > DOE2.1E model.
> > >> > >  For the daylight component of the simulation, I am hourly
> > >> > >  illuminance
> > >> > > values for the Energy Plus that 4 to 10 times greater than
> > >> > > what I
> am
> > >> > > seeing with DOE2.1E.   Can this be right?  I am using the
> > >> > > same weather file and the same Window 5.1 file for both
> > >> > > simulations.
> Has
> > >> > > anybody seen results like this.  I have checked over my input
> > >> > > and
> am
> > >> > > semi-sure that it is correct.  Any suggestions?
> > >> > >
> > >> > >
> > >> > > Best Regards,
> > >> > >
> > >> > > Peter Loutzenhiser
> > >> > > post@xxxxxxxxxxx
> > >> > > PhD Student
> > >> > > Mechanical Engineering
> > >> > > Iowa State University
> > >> > > Office: 515-294-0365
> > >> > >
> > >
> > >Best Regards,
> > >
> > >Peter Loutzenhiser
> > >post@xxxxxxxxxxx
> > >PhD Student
> > >Mechanical Engineering
> > >Iowa State University
> > >Office: 515-294-0365
> >
> > Best Regards,
> >
> > Peter Loutzenhiser
> > post@xxxxxxxxxxx
> > PhD Student
> > Mechanical Engineering
> > Iowa State University
> > Office: 515-294-0365
> >
> >
> >
> >
> > To unsubscribe from this group, send an email to:
> > EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> >
> > 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 are of the Support Web Site.
> >
> >
> >
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
> >
> >
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx


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References:
- Re: [EnergyPlus_Support] Daylighting
  - From: Joe Huang

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