[TRNSYS-users] about open window in building

[David Bradley]

Raj,
   There are a number of ways that you can model an open window. The 
simplest approach is to define a zone air change rate of infiltration for 
when the window is open and then use a model (forcing function, controller, 
etc.) to determine whether the window is open or closed at any given point 
in the simulation. That of course leads to the question of how to determine 
an appropriate air change rate when the window is open... there are two 
methods for dealing with that; one uses a TRNSYS link with CONTAM, the 
other uses a TRNSYS link with COMIS. The CONTAM link is built into the 
standard TRNSYS 16 package. Basically, you download CONTAM from the NIST 
website (it's free), assemble your building model in CONTAM and export that 
model as a *.air file. You then add Type97 to your TRNSYS simulation. 
Type97 is a Fortran implementation of CONTAM that calculates interzonal and 
infiltration flow of air in the building. The flow rates calculated by 
Type97 are passed to Type56 while zone temperatures are passed back to 
Type97. If you decide to get into using CONTAM, I'd recommend getting the 
latest TRNSYS version (16.1) as it has an enhanced version of Type97 that 
allows you to modify the CONTAM air flow model as the simulation is running 
instead of only allowing you to use a static air flow model as was the case 
in the 16.0 release.
Kind regards,
  David


At 12:26 4/26/2006, RAJ KUMAR wrote:
>Hello all,
>
>       I want to simulate buiding(TYPE 56) with open window (window 
> without glazing).
>Is it possible?. If so, kindly explain me.
>
>         In another case, I find window(no glazing) type in window 
> library, winid=10001and it is mentioned that U value is 5.8 W/m^2K. So I 
> am getting difference in outside and inside sol air temperature 
> of  window,if I select win ID=10001.
>
>       Can anyone help me?
>
>regards,
>Rajkumar.S
>
>
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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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