Re: [EnergyPlus_Support] Opaque Surface Inside Face Conduction

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

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  
> 
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> 
> Attachments are not allowed -- please post any files to the appropriate folder
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> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the
> "search" button.
>  
> Yahoo! Groups Links
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> 


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





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