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Re: [TRNSYS-users] help - shading!!!
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
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