[TRNSYS-users] Buildings thermal inertia

[Ilyas KHELIFA KERFAH]

Hi Antonio,
I too had the same problem on TRNSYS. You have heavy walls and you find a weak inertia. so you have to change the default capacitance of TRNSYS which is (r * c * v air and it does not consider the furniture) thereafter it is necessary to multiply this capacitance by 5 until by 10. and you can see the difference.
Have a good day.


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Ilyas KHELIFA KERFAH Ph.D Student
Faculty of Civil Engineering
Laboratory of Built Environment
University of Sciences and Technology Houari Boumediene
BP 32 El Alia 16111, Bab Ezzouar, Algiers - Algeria
Tel : + 213 553 690 011
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________________________________
De : TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org> de la part de Antonio Andricciola via TRNSYS-users <trnsys-users at lists.onebuilding.org>
Envoyé : mardi 21 novembre 2017 10:22
À : trnsys-users at lists.onebuilding.org
Cc : Antonio Andricciola
Objet : [TRNSYS-users] Buildings thermal inertia

Hi,
I'm running some simulations for a single-family house with TRNSYS and one of my purposes is showing that the program takes into consideration the effect of thermal inertia into its calculations. I have two building models, "light" and "heavy" (the first one modelled through massless layers) with more or less the same characteristics as concerns trasmittance. If I force a sinusoidal temperature profile for outdoor temperature, I can appreciate the delay and damping effects looking at the temperature profile of the heavy building internal wall surface. However if I plot the heating demand as well (given by the heating type set in TRNBuild) for the heavy building I see that power is not in synch with wall internal temperature. At first I thought that it was due to the storage effect of walls, but the heating type is modelled as 100% convection, so the walls shouldn't influence the phenomenon dynamics this time. Am I missing or neglecting something? Thanks in advance for your answer.
Antonio Andricciola
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