Dear TRNSYS-user,
I have the following problem. I am trying to input a CHTC-correlation
in the building model. I am using the input value recall to get the
surface and air temperature of one timestep before. I can calculate
the CHTC and plot it with an online plotter, but whenever I try to
use it as an input, a get the "pane temperature calculation is
diverging" warnings from the start of the simulation and the
simulation stops. The CHTC is non-zero and positive, and for now, the
equation used is simply max(1,2*abs(surftemp-airtemp)). If I
calculate a variable CHTC without using the surface and air
temperature, the simulation runs without error.
I have used TRNSYS3D to make my one-zone model, including one window
facing south-west (TURN = -45°) and 4 air nodes. I am using the
detailed radiation model, so all air nodes are combined into one
zone. Viewfactors and insolation matrix are generated without
problem. I have gone back to the most basic simulation, using only
the idf imported in a 3D building project standard template, with a
standard Meteonorm Uccle climate.
Following recommendations in previous posts, I have set the CHTC at
the window to the standard fixed values for inside and outside. I
have also checked if something went wrong when drawing the window in
sketch-up, but I do not see any lines that shouldn't be there.
Changing to a different glazing doesn't help either.
Can anyone give me some help as to what else I can try? I have done
this before without problems, but it is the first time I try it with
trnsys3D.
Please answer to me privately as well, as I am not subscribed to the
mailing list.
Kind regards,
Sarah
--
ir. - arch. Sarah Leenknegt,
Afdeling Bouwfysica, Dept. Burgerlijke Bouwkunde,
Faculteit Ingenieurswetenschappen, KULeuven,
Kasteelpark Arenberg 40 - bus 2447, 3001 Heverlee, België
sarah.leenknegt@bwk.kuleuven.be
tel. 016 321347
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