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Badreddine Dalal, You either have a wall that is too massive (usually too thick) for the wall transfer function coefficients to be generated or you have a wall that is not massive enough. If you look at the very end of the *.inf file that is generated when you try to save your TRNBuild project, you will see the transfer function coefficients of the walls as they are being generated. Look at the last one in the list; that is the wall that is causing problems. If you have ruled out that its construction is too thermally massive (i.e. it has fairly typical materials and overall thickness) then the problem may be that the wall does not have enough mass. This is often true if you are modeling doors (especially garage doors) or metal roofs. If this is the case then you should consider the wall layers to be massless (in the TRNBuild layer manager) and account only for their R value (neglecting their ability to store energy) regards, David On 06/10/2015 02:51, Dalal Badreddine
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-- *************************** 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 |