Eleni, It is not exactly correct because it is not time dependent and uses default interior and exterior convective coefficients but I usually use the u-value shown in the *.inf file as my reported u-value for walls. I do not think that there is a special ntype for the u-value of walls. Please someone correct me if I am wrong about that!! As for NTYPE86, it is the equivalent thermal resistance (r-value) between a given (user specified) surface and the star-node (for radiation exchange calculations). Kind regards, David eleni ampatzi wrote: Dear All, -- *********************************************************************** 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 *********************************************************************** |