[TRNSYS-users] Window with shading

[Michaël Kummert]

Christian,
> 
> i have to do an simulation of an multizone building with windows, which
> have an internal shading device between the inner and outer pane of the
> glazing.
> But i dont have any idea how to deal with that.
> I don't think that the opportunities that Prebid offers in order to create
> an internal
> or external shading are sufficent for that kind of window!
> The only idea i have is to use the programm window. But how can i
> define the internal shading device between the panes? What are the
> properties
> in this case?
> Does anyone have an idea? Thank you in advance!
> 

I don't think WINDOW (4 or 5) allows you to define shading devices.
My understanding is that the WIS program (www.windat.org) allows to 
model such configurations, but it is still under development and there 
is no standardized way of using its output in TRNSYS.

Here are a few other ideas on how you could approach the problem (Please 
take them for what they are worth, i.e. not more than 2 cents ;-)

- You could cheat on the absorptance of 2 panes to get the desired
   behavior in some "standard" steady-state conditions, but this requires
   a good knowledge of WINDOW and it is only an approximation.

- Find an upper and lower bound of the system's performance by placing
   the shading inside and outside (resp. minimum and maximum cooling load
   reduction)

- Use a fictitious zone with two single-glazed windows. This is probably
   not a very good idea, you would have to run many checks to make sure
   the thermal and optical behavior makes sense if you go for that
   solution...

I hope this helps (and I hope other TRNSYS users will comment on this),


Michaël Kummert

-- 
_________________________________________________________

Michaël Kummert

Solar Energy Laboratory - University of Wisconsin-Madison
1303 Engr Res Bldg, 1500 Engineering Drive
Madison, WI 53706

Tel: +1 (608) 263-1589
Fax: +1 (608) 262-8464
E-mail: kummert at engr.wisc.edu

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