[TRNSYS-users] mismatch between type 30a and type99

[David BRADLEY]

Santeri,
   This same issue frustrated me a long time ago as well. You have to 
set the weather data reader to use the isotropic sky model. Type30 (and 
Type34, incidentally) both make some isotropic sky assumptions 
internally so the radiation that comes in to them needs to make use of 
the same diffuse model.
Kind regards,
  David


On 9/25/2012 09:25, Santeri Siren wrote:
> Hello all,
>
> I am trying to use type 30a to model collector array shading on my PV 
> panel rows. I ran some test simulations and there seems to be a 
> mismatch between type 30a and weather data file in the total radiation 
> that reaches the surface.
>
> I set the following parameters to type 30 and to type 99 (weather data):
>
> - slope of surface = 45
> - azimuth angle of surface = 0
>
> also in type 30:
>
> -slope of field = 0
>
> Then I set the row separation in type 30 to value 100 m. (there should 
> be no shading between PV arrays)
>
> When I log the total radiation on surface from type 30 and type 99 
> there is a mismatch. The radiation level of type 30 is always a little 
> lower than in the type 99. Does anyone know how this is possible? have 
> I possibly made wrong connections?
>
> Best regards. Santeri Siren
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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