[TRNSYS-users] Buildings thermal inertia

[Antonio Andricciola]

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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