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Tao, CONTAM itself has two different models for bi-directional flow; a "one opening" and a "two opening" model. Only the "two-opening" model is implemented in TRNSYS Type97. When you set up your *.air file in the CONTAM-W interface, specify all of the large vertical openings through which you want there to be two-way flow as "two-opening" air flow paths. As for your other question, I'm not sure exactly what is happening there but it seems clear that the model is simply not converging. If you do not connect the wind data to your building, Type97 (CONTAM's) assumption is that the windspeed is always zero. However, because the Type is trying to solve a pressure balance, you still need to make sure that there are enough openings in the envelope of your building because ambient pressure still has an important effect. What I would recommend that you do is to run the TRNSYS/CONTAM example and then begin modifying the project one step at a time to make it more like the building you are trying to simulate. For example, you could start by disconnecting the windspeed input to Type97, then you could change the zone volumes of both your Type56 and your Typr97 zones to be more like your real building, then you could alter the zones themselves (add more, remove some), etc. Kind regards, David On 9/24/2010 05:34, Yujun TAO wrote:
-- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 22 North Carroll Street - suite 370 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |