Re: [TRNSYS-users] question about shad factor in building

[David Bradley <bradley@tess-inc.com>]

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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>
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