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



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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