[TRNSYS-users] Collector array shading Type 30 and radiation model

[Marion Hiller]

Cédric,

are you familiar with building model Type 56?
If yes you can use it to calculate the diffuse shading acc. to a Perez sky.
If not is maybe too complicated to explain everything correctly.

For Type 56 you can generate a shading maks by TRNbuild after drawing your "building" including shaders in SketchUp.
Your "building" would be a box with a sloped roof and a roof window representing you collector row.
The row in front of  the collector row is defined as "shader".
You need to use  the option "internal radiation calculation" for the roof orientation.
For the roof window you can select the output "incident diffuse radiation including shading effects" .
This output divided by the area would be the input for your collector model.

Marion




Dipl.-Ing. Marion Hiller

Transsolar Energietechnik GmbH
Curiestraße 2
70563 Stuttgart
Telefon: +49 711 67976-0
http://www.trnsys.de<http://www.trnsys.de/>

Transsolar: KlimaEngineering- Technologien für energieeffizientes Bauen und Nutzerkomfort in Gebäuden
Stuttgart - München - New York - Paris
Geschäftsführer :Diplom-Ingenieur Matthias Schuler, Diplom-Ingenieur Thomas Auer, Diplom-Physiker Stefan Holst, Diplom-Betriebswirt Dieter Schnelle
Eingetragen beim Amtsgericht Stuttgart HRB 23347,
Steuernummer: 99073/00911,USt-IdNr.: DE 152272639

________________________________
Von: trnsys-users-bounces at cae.wisc.edu [mailto:trnsys-users-bounces at cae.wisc.edu] Im Auftrag von PAULUS Cedric 217865
Gesendet: Montag, 31. März 2014 17:40
An: trnsys-users at cae.wisc.edu
Betreff: [TRNSYS-users] Collector array shading Type 30 and radiation model

Dear TRNSYS-Users,

I would like to use the type of collector array shading between rows (type 30) connected to a weather data reading and processing (type 15) in order to simulate performance of large scale solar collector field.

I made some first check only with one row in order to find normally the same results as without collector shading. The beam radiation is the same (normal) but the total radiation is lower due to a lower diffuse radiation (not normal). When I check the type 30 model it seems that an isotropic sky model has been implemented in order to calculate the diffuse radiation. Am I right ?

As I prefer to use the Perez 1999 Model (5 for the parameter "Tilted Surface Radiation Mode" of type 15), I would like to know if this model was or is planned to be implemented in the type 30 ?

Thanks
Best Regards,

Cédric Paulus
CEA INES - DTBH/SBRT/LSHT | +33 (0)4 79 79 21 17

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