Re: [EnergyPlus_Support] Daylighting

["Michael J. Witte" <mjwitte@xxxxxxxx>]

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 
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> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support      
> EnergyPlus-Support@xxxxxxxx
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx


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