Dear users,
I am using TRNSYS version 16 for buildings.
I compare the QTSPAS output of TRNBuild for the building when I change the double-glazing window type.
“ntype74 QTSPAS total solar radiation passing (trans+abs) the glass surface of external windows of zone”
The 2 window types compared have the same g value (1% difference) and the same area frame/window proportion.
They differ strongly by their Ug values
I found that the QTPAS values related to the windows are different: ~3% .
I wonder why, having the same g values, the solar radiation passing (trans+abs) the glass surface are different.
I did not find in manuals the QTSPAS output calculation procedure.
Can you give me more information?
Thanks a lot.
Patricia Evrard