Chun Kwong, I think you might want to look back at your window data - as you can see from the warnings leading up to the one that you highlighted, Type56 is not able to converge on a window pane temperature (it has calculated the pane temperature as "non a number" (NaN).) One thing you might try to do is to turn off any automatic heat transfer coefficient calculations on your windows. Usually, it is not a problem but for certain windows that have window pane temperatures that are sensitive, that heat transfer coefficient can change dramatically from one iteration to the next and cause problems converging on a pane temperature. Kind regards, david a8304506@graduate.hku.hk wrote: Hello, Trnsys users. I got some strange errors from Type56 while performing a simulation (see attached picture). Does anyone know how to fix them? Your reply is appreciated. Best Regards LEE, Chun Kwong Research assistant Division of Building Science and Technology City University of Hong Kong -- *********************************************************************** Thermal Energy System Specialists (TESS), LLC David BRADLEY 22 N. Carroll Street - Suite 370 Partner Madison, WI 53703 USA P: +1.608.274.2577 F: +1.608.278.1475 E-mail: bradley@tess-inc.com Web Pages: http://www.tess-inc.com and http://www.trnsys.com *********************************************************************** |