Re: [EnergyPlus_Support] surface area of the internal mass Vs building internal heat capacity

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

Internal mass is modeled as any other adiabatic heat transfer surface.  The 
"inside" surface of the internal mass has area (A) which interacts with the 
zone by radiant and convection exchange, and it receives solar gains and 
radiant gains from internal loads (electric equipment, people, etc.) just like 
any other heat transfer surface.  The "outside" surface of the internal mass is 
assumed to be at the same temperature as the inside surface, and heat is stored 
and released by the material layers.  So, the area is used to determine the 
thermal mass of the internal mass object, but it also impacts other heat 
transfer mechanisms.

You said that you are using internal mass to change from a light building to a 
heavy building.  This will increase the interior thermal mass, but the exterior 
walls will still be lightweight.  A true "heavy" building would probably have 
additional mass in the exterior walls as well.

Mike



On 10 Jul 2006 at 10:30, houcem mechri wrote:

> Hello every body
>    
>   I would like to know if the surface area of the internal mass is used only
> to calculate the internal heat capacity Cz because I find strange results when
> I change this surface area  to obtain buildings from heavy to light.
>   thanks.
> 
>  		
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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