Re: [EnergyPlus_Support] Re: Opaque Surface Inside Face Conduction

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

There is no need to switch to regular-R materials.  In fact, it is better to 
use at least some materials which are material:regular.  Did you shut off the 
sun (clearness = 0.0 in the design day objects)?

Beyond that, I need to see the input files to suggest anything further.  Upload 
to the files are in the yahoo group or send as zipped attachment to energyplus-
support@xxxxxxxx

Mike


On 11 Aug 2006 at 23:05, aboyemeplus wrote:

> Mike,
> 
> Mike,
> 
> I have implemented your suggestion below and made the model as 
> simple as possible by using Regular-R materials on all construction 
> elements, no internal loads, and by setting thermal absorptance to 
> low values.The results obtained from design day simulations using 
> this model are very similar to what I had obtained when using 
> regular materials. Is there anything else that I need to set to 
> force a steady-state solution?
> 
> Thank you for your support.
> 
> Merid 
> 
> 
>  
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
> <mjwitte@...> wrote:
> >
> > Read carefully the definition of this report variable in the Input 
> Output 
> > Reference.  Because surfaces can store heat, the outside surface 
> temperature 
> > has little to do with the current value of inside face 
> conduction.  The indoor 
> > air temperature, the inside surface temperature, and the balance 
> of radiant and 
> > solar energy falling on the inside surface will determine the 
> direction of 
> > inside face conduction heat flow.  I would suggest making the 
> model as simple 
> > as possible (no sun, steady-state, no internal gains, and perhaps 
> even set 
> > thermal absorptance to something very small to minimize radiant 
> transfer 
> > between surfaces) to first convince yourself things are working 
> OK.  Then add 
> > each component back in one by one and see how things change.
> > 
> > Mike
> > 
> > 
> > On 21 Jul 2006 at 21:03, aboyemeplus wrote:
> > 
> > > The model in question has a single zone with all its surfaces 
> > > subjected to constant temperature boundary conditions.
> > > During Winter design runs The "Inside Face Conduction" for all 
> walls, 
> > > with the exception of the floor, is Positive despite the fact 
> > > that "inside wall surface temperatures" are higher than " 
> outside 
> > > surface temperatures" in all cases. 
> > > During Summer design runs, "inside wall surface temperatures" 
> are 
> > > still higher than " outside surface temperatures", but this time 
> > > all "Inside face conduction" rates are negative.
> > > 
> > > While I can make sense of the Summer design results, the Winter 
> > > results are counter intuitive to me. Can someone help?
> > > 
> > > Thank you for your time.
> > > 
> > > Merid  
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > The primary EnergyPlus web site is found at:
> > > http://www.energyplus.gov
> > > 
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> > > 
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> > 
> > 
> > ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support      
> > EnergyPlus-Support@...
> >
> 
> 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
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> 
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> 
> 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
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> 
>  
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> 


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





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