RE: [EnergyPlus_Support] Further Insight : Skylight / Radiant Cooling Strange Behavior

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

Digging into this further, the problem appears to be the values reported by 
"Zone Window Heat Gain" and "Zone Window Heat Gain Energy".  When the radiant 
cooling is active, these zone variables do not agree with the surface variables 
"Window Heat Gain" and "Window Heat Gain Energy".  So, use the surface 
variables instead and I think you will find the results to be more reasonable.

Checking the change in cooling load with and without the skylights, at hour 
10:00:

Zone Window Heat Gain = 5.53E+04
Window Heat Gain = 1.38E+04
Change in cooling load w/o skylights = 5.89E+03

So, this appears to be a reporting problem with the zone level window heat gain 
report variable and not a problem in the overall heat balance.

Mike


Mike


On 19 Oct 2006 at 13:37, Michael J. Witte wrote:

> Ian:  
> 
> If you delete the skylights, does the cooling load on the radiant system
> change 
> by the same order of magnitude as the reported heat gain from the skylights? 
> I 
> suspect this may just be a problem with the reported window heat gain rather
> than a real heat balance problem.  The reported window heat gain is just a
> side 
> calculation for reporting purposes, that value is not actually used in the
> heat 
> balance.
> 
> Mike
> 
> 
> On 15 Oct 2006 at 15:42, Linda Lawrie wrote:
> 
> > At 04:27 PM 10/13/2006, Griffith, Brent wrote:
> > >I believe this is a known bug (CR6897).  But unfortunately it isn't a
> > >quick job and I don't think it was fixed in V1.4 (which is already out).
> > 
> > As Brent says, this is a known or suspected problem.  If you submit 
> > your file (either send direct to me or upload to the support web 
> > site), it may help our developer in tracking it down.
> > 
> > 
> > Linda
> > 
> > EnergyPlus WebSite: http://www.energyplus.gov
> > Owner: EnergyPlus_Support list
> > Member: EnergyPlus Development Team
> > 
> > 
> > 
> > [Non-text portions of this message have been removed]
> > 
> > 
> > 
> > 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
> > 
> > 
> > 
> > 
> > 
> > 
> 
> 
> ========================================================
> 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 folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the
> "search" button.
>  
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 


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





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