[TRNSYS-users] solar absorptance of walls

[FREPPEL Wirich]

Hello everyone,

I'm running some tests in order to compare TRNSYS to another software, 
which is Energy+.

My model is simple, a 3 meters long cube, with the same composition for 
all the faces, without windows.
What I did in first place, was to create a new multizone project using 
an idf file created from sketch up. Then I runned the simulation in 
order to observe the evolution of the air temperature inside the box.
Comparing it to Energy+ results, I noticed that in summer, the 
temperature is far below those of Energy+. So I looked at the 
connections in simulation studio to see if there was a problem on the 
solar radiation on the walls, and I noticed that initially, there are 
not any connection which give the solar radiation on the walls.

My conclusion is that to take account of the solar radiation on walls, 
we have to link it by ourself at the beginning, is it right or did I 
miss something?.

Furthermore, in the "wall type manager", there's a tab called "Solar 
Absorptance of wall". When I change the value, nothing change regarding 
the temperature inside the box. So when is this value used exactly?

Thank you in advance.

King regards

-- 
Wirich FREPPEL
Doctorant Recherche & Developpement (PhD student)
Noirot
8 rue Ampere, 02000 Laon
+33 (0)3 23 27 31 99