Juan Francisco, I think you could use the TRNBuild "exterior shading factor" to model dirty windows. The user sets a value between 0 and 1 for a particular window and solar radiation is reduced accordingly. Beam and diffuse are both diminished by the same fraction. Kind regards, David On 6/22/2012 03:28, JUAN FRANCISCO BELMONTE TOLEDO 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 |