Re: [EnergyPlus_Support] High thermal mass envelope

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

I cannot say for sure if CondFD will be more accurate or not.  If the CTF 
algorithm reaches convergence during the warmup days, then it should be 
reasonably accurate.  CondFD should be able to handle this case as well.  But I 
cannot say that I have verified and compared anything close to the level of 
mass you are modeling.  Sorry I cannot be more definite.  At a minimum, be sure 
that all methods handle the steady-state case appropriately (whether it be 
EnergyPlus or other tools).  Constant temperature with no solar and no radiant 
exchange should result in a UADeltaT case which can be verified by hand.  Any 
method which does not agree for that will probably not be correct for the non-
steady case.

Mike


On 17 Apr 2007 at 11:35, Emanuel Sá wrote:

> Dear all
> 
> I'm simulating a 80 cm thick granite wall building. This is obviously
> a high thermal mass envelope. I know that there are some problems
> regarding the simulation of high thermal mass envelopes. I'm also
> comparing my results with the results provided by TRNSYS for the same
> building. In fact they don't match at all! so I was wondering witch
> solution algorithm should I use. I'm currently using the CTF but maybe
> for high thermal mass, the ConFD is more accurate.
> Can anyone give me some insight about this issue?
> 
> Thank you in advance
> 
> Emanuel Sá
> 
> 
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> 
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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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