Type 546 in the Solar Library from TESS estimates the direct and diffuse components from the global radiation on a tilted surface. You could possibly use one Type 546 for each of your orientations, to calculate the diffuse/direct split from the measured total radiation. Of course there is no guarantee the different estimates would be consistent, so for example the horizontal radiation you will get from the different Type 546 units will probably be different, but at least you would use your global radiation measurements on all orientations.
Unfortunately Type16 can't convert from an arbitrary angle back to horizontal then do its calculations. I remember seeing (perhaps even using) such a component a few thousand years ago but would not know where to put my hands on it again.
I would think that with such a slight slope as 10° you could use sines and cosines to determine what the global on the horizontal actually was before feeding it to Type16.
Hello David,
That is an excellent idea !
I did not exactly measure horizontal radiation since the “horizontal” pyranometer was placed on the roof, which is 10° tilted. I guess I could try first by considering the roof as horizontal since 10° is not that much. I could also estimate the horizontal radiation by calculation, or finally, does the type 16 can do this job ? If I understand, Type 16 can go from horizontal to any tilt but not the other way around, does it ?
Thanks for your help
Wirich FREPPEL
Development engineer
COSMOS - Buildings Energy Performance & Daylighting Group
Cell: +33 637 053 174
Saint-Gobain Research Compiègne
Wirich,
Did you also by chance measure global on the horizontal? If so then what I would suggest you do is to define your same vertical surfaces in Type16 and then run your measured global horizontal through it. Type16 will give you an estimate of how the global breaks up into beam and diffuse not only for the horizontal but also for the vertical surfaces. I would then compute the ratios of beam to global and diffuse to global that Type16 gives you for each surface and then use those ratios multiplied by your actual measurements to come up with the components that Type56 wants.
kind regards,
david
On 06/17/2021 04:15, Freppel, Wirich via TRNSYS-users wrote:
Dear Trnsys users,
I measured global solar radiation on vertical surfaces (one for each orientation) using a pyranometer. I would like to use these data on my building model instead of using “internal calculation”.
Type 56 asks for direct and diffuse solar radiation arriving on the surface. How can I manage the data to send the appropriate values to Type 56 ?
Thanks in advance for your help
Wirich FREPPEL
Development engineer
COSMOS - Buildings Energy Performance & Daylighting Group
Cell: +33 637 053 174
Saint-Gobain Research Compiègne
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