[TRNSYS-users] help - shading!!!

[David Bradley]

Type67 is a generic shading component so whether a building or a side 
fin is causing the shading doesn't really matter; you can do some 
basic geometry calculations in order to determine the angular height 
of the side fins as seen by the center point of the horizontal PV and 
enter those values into a *.msk file. Assessing the power production 
from a shaded PV is also a bit complex because power is not a linear 
function of the amount of shading on a PV panel. The power loss due 
to partial shading has to do with how the cells are connected in 
series and in parallel; if one cell in a series string is completely 
shaded and there is no bypass diode in the panel, that entire string 
has an open circuit on it and produces no power. Some years ago I 
wrote a component that assess the amount of shading by rows of 
collectors (much like Type30) but then makes a pessimistic and an 
optimistic assumption about the effect of the shading on a given PV 
panel. Using that component (Type551 in the TESS Green Building 
Library) you can get an idea of the range of output power that you 
might get from the shaded PV array but unfortunately, Type551 does 
not model side fins.
Regards,
  David


At 11:08 7/9/2007, =?ISO-8859-7?B?yv7z9OHyIM/x5O/17PDv5tzt5/I=?= wrote:
>Hi
>I have a roof with PV. The roof have some sidefins that shade a part 
>of PV's. Is there any module for calculating the shade in a 
>horizontal surface, without having import a building geometry ?
>
>Thank you
>_______________________________________________
>TRNSYS-users mailing list
>TRNSYS-users at engr.wisc.edu
>https://www.cae.wisc.edu/mailman/listinfo/trnsys-users

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