[TRNSYS-users] question about shad factor in building

[David Bradley]

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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Thermal Energy System Specialists (TESS), LLC
David BRADLEY                           2916 Marketplace Drive - Suite 104
Partner                                        Madison, WI 53719
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Fax: (608) 278-1475
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