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

[Philip van den Enden <p.vandenenden@chri.nl>]

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 
advance,


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@chr.chri.nl

------- DISCLAIMER-------
De informatie verzonden met dit e-mail bericht is uitsluitend bestemd voor
de geadresseerde.
Openbaarmaking, vermenigvuldiging, verspreiding en/of verstrekking aan
derden is niet toegestaan.
Gebruik van deze informatie door anderen dan de geadresseerde is verboden.
U wordt verzocht bij onjuiste adressering de afzender direct te informeren
door het bericht te retourneren.
The information sent by means of this e-mail message is intended only for
the use of the addressee.
Publication, duplication, distribution and/or forwarding to third parties
of this message, as well as use of the information by other persons than
the intended recipient, is strictly prohibited. If you have received this
communication in error, please notify the sender immediately by returning
it.
------------------------------------