RE: [EnergyPlus_Support] very very hard question

["Griffith, Brent" <brent_griffith@xxxxxxxx>]

Those masses are not included in that air mass term and are not "assumed
to be in equilibrium with the zone air."  Their heat balance impact
enters in the hA(T - T) term. 

 

Internal thermal mass is entered with the
Surface:HeatTransfer:InternalMass input object and is treated like a
surface that interacts with zone air much like a normal heat transfer
surface.  There is surface convection and thermal radiation with other
surfaces.  They have heat capacity and are modeled dynamically. 

 

(If one really did need to control heat capacity of zone air, it can be
done with the Zone Volume Capacitance Multiplier input object.  )

 

________________________________

From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of anca_unica
Sent: Friday, January 18, 2008 5:25 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] very very hard question

 

Hi all
I'm trying to understand from EnergyPlus Engineering Document which is 
the energy balance equation used by the software.
Pag 5: Typically, the capacitance Cz would be that of the zone air 
only. However, thermal masses assumed to be in equilibrium with the 
zone air could be included in this term.
How it calculates the Cz value including thermal masses?

 



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