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[TRNSYS-users] solar radiation in second skin facade model

Dear all,

I have a question concerning the model of a second skin facade:
My model consists of two rooms: one represents the second skin facade 
(single glass (g-value 0,9) on exterior side, double glass (g-value 0,6) on 
the office side. So:

exterior | 2nd skin || internal office room

The problem is about the solar radiation entering the office room. Even 
without any sunshading device within the second skin, the total solar 
radiation absorbed in the office room (zone output 75) appears to be much 
lower than one would expect based on the total solarradiation entering the 
second skin and the g-value of the double-glass window (Qin*g-value).

I am not clear about what TRNSYS does with the solarradiation after passing 
the first single glass layer. Does it all become diffuse radiation or 
something else and therefore is treated differently by the second double 
glass-layer? I already put the geosurf factor of the double glass window on 
1, but that doesn't help much. Can anyone shed some light on this, or did 
anyone ever experience similar "glass-after glass"-problems? Thanks in 

Philip van den Enden

Cauberg-Huygen Raadgevende Ingenieurs BV
Bezoekadres: Boterdiep 48, 3077 AW  ROTTERDAM
Postadres: Postbus 9222, 3007 AE  ROTTERDAM
Telefoon: +31 (0)10 - 4 25 74 44
Fax: +31 (0)10 - 4 25 44 43
Web: http://www.chri.nl
E-mail: p.vandenenden@xxxxxxxxxxx

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