[TRNSYS-users] Initial temperatures in a multizone building with TAB-system act as heat source!?

Philip philiphorn at gmx.de
Tue Jul 1 05:50:55 PDT 2014

Dear All,

I am experiencing a strange relationship between simulation results and 
the initial zone temperature.
Of course the results are dependent of the initial values, BUT the 
simulation only yields realistic results if the *start day is either 0 
or 1*.
For all other *START times* the room temperatures will have the 
corresponding *initial zone temperature as a lower bound*!

In the screenshot you can see the Tair of 9 zones and the ambient 
This was created with only the building and weather processing in the 
Deck,*no control or schedules attached/activated*.
*Ideal Heating and Cooling powers are all set to Zero*, so there is *no 
active temperature control in the Deck*.

  * Can anyone can explain this behavior?
  * The original building was created with *TRNFLOW*, so a airlink
    network is implemented. I do not have a TRNFLOW license, so I simply
    copy and paste the original TRNFLOW part in the bui file (geometry
    and zones are untouched!). Might this be the cause?
  * Is there something like a "built-in *settling phase* feature", that 
    might be activated in a wrong way and thus dictates something
    like*ideal heating*?

I scanned the archives and the models, but could not locate the error.

Any help or advice is highly appreciated!!

Thanks a lot in advance,


M. SC. Dipl. Ing. (FH) Philip Horn 
<http://gr.linkedin.com/pub/m-sc-philip-horn/19/1a8/68a>Philip Horn

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