[TRNSYS-users] direct and diffuse solar radiation through glazing

[Freppel, Wirich]

Dear TRNsys users,

I apologize in advance as this subject was already discussed one year ago, but I think some more explanation could help me to go further in my study. (http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/2018-November/030610.html)

I'm trying to calculate the Effective Radiant Field of an occupant, based on TRNsys outputs. To complete the calculation, I need the total diffuse solar radiation entering the airnode through glazing, as well as the total direct radiation. Not being sure of what output I should choose, I compared :

-          Total tilted surface radiation (which I assumed to be the total direct and diffuse solar radiation arriving on the window)

-          QSOLTR (which I assumed to be the total shortwave solar radiation transmitted through the window to the airnode)

-          QTABSI (which I assumed to be the total radiation transmitted to the airnode)

-          QTSGL (which I assumed to be the total solar radiation passing from outside surface of the window to the airnode)

According to the results, at day time, so when there is solar radiation, Total tilted surface is below the others. So it means, according to what I see, that solar radiation is bigger after going through the window. After those results, it's difficult to say I understood well what I am doing...
Could you help me to understand those outputs and advise me on the output to choose for "total diffuse solar radiation entering the airnode" and "total direct solar radiation entering the airnode"?
Marion mentioned to use "QSOLTR-QTSOUT". That would be ok for me, but why is QSOLTR bigger than total tilted surface radiation?

Again, I'm really sorry for digging out that topic again but I do think my interpretation is very bad at the moment.
Thank you in advance for your help.

Wirich FREPPEL
Development engineer, PhD
COSMOS - Buildings Energy Performance & Daylighting Group
Cell: +33 637 053 174
Saint-Gobain Research Compiègne

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