Re: [TRNSYS-users] comparing TRNSYS with other building simulation

[Adrien JEZEQUEL <a.jezequel@itf.biz>]

Dear Mirjam,

Are you sure that temperatures observed with the other model are "Air temperature"?
Maybe the model gives not air temperature, but operative temperature, which is a combination of the air temperature and the temperature of the surrounding surfaces.
In TRNBUILD air temperature is given by the following relation : Top = Aop ⋅ Tair + (1-Aop) ⋅ Tsurf

Best regards, Adrien


Mirjam Peters a écrit :

Hi TRNSYS-users,

 

I am trying to simulate a simple office room in Simulation Studio and TRNBuild and to compare the results with another building simulation program. I’ve checked all inputs (like climate, ventilation, internal gains etc.) and these are the same in both simulations. However, with everything I try, there is a significant difference in room air temperature of the two simulations. The TRNSYS air temperature is always several degrees higher than the air temperature in my other model, but the temperature graph shows the same course (it seems to be just shifted up)!

 

Does anyone has come across the same problem? And/or has someone any ideas on how to check what can be the difference in inputs/both simulations?

Could it be an idea to use a single zone building model instead of type 56 for my single room simulation?

 

Thanks in advance.

 

With kind regards,

 

M.A.E. (Mirjam) Peters Msc

Technical specialist Building Physics

 

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Adrien JEZEQUEL Simulations Thermiques Dynamiques ITF (Ingénierie Tous Fluides) 87, route de Chambéry 73230 ST ALBAN EN LEYSSE FRANCE Tel: 04.79.75.00.29 Website: www.itf.biz Mail : a.jezequel@itf.biz