[TRNSYS-users] From global solar radiation to direct and diffuse SR

[Freppel, Wirich]

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



De : David BRADLEY <d.bradley at tess-inc.com>
Envoyé : jeudi 17 juin 2021 15:21
À : TRNSYS users mailing list at OneBuilding.org <trnsys-users at lists.onebuilding.org>
Cc : Freppel, Wirich <Wirich.Freppel at saint-gobain.com>
Objet : Re: [TRNSYS-users] From global solar radiation to direct and diffuse SR


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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