Yujun,
The internal and external shading factors in
TRNBuild reduce the amount of solar radiation
that passes through the window by multiplying the
radiation that you have specified as an input for
that window by the shading factor that is
specified. The factor affect beam and diffuse
radiation the same; if you specify a shading
factor of 0.5, then you will get exactly half of
the unshaded beam and diffuse radiation affecting
your zone. For external shading factors, the
incident radiation is reduced before passing
through the windows. For internal devices, the
energy balance is a bit different and the
reflectance of the device toward and away from
the zone (as specified in the window) comes into
play. There is some more information on this
energy balance in the 06-Multizone Building manual.
Kind regards,
David
At 06:04 11/30/2007, Yujun TAO wrote:
Dear users,
I don't understand clearly, Internal shad factor
and External shad factor, in the definition the
caractéristique of window. Does anyone could tell me the details?
best regards
TAO Yujun
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