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Mahbubul, I am not sure what you mean by static and dynamic. It seems to me that if you solve the energy out/energy in equation at each timestep then plot the result, you would have the collector's dynamic efficiency (in other words its efficiency at any "point" in time). If, however, you integrate energy out and energy in before evaluating the equation then you have an average (call it static) efficiency for the array over the course of the simulation. Perhaps you want to see the efficiency of the collector as a function of where you are along the length of the collector? In this case, you would need to have a noded collector model that reported the temperature of each collector node. In this way you could calculate the efficiency of each collector node (using the same equation but looking just at the energy collected by and incident on each node of the collector instead of on the collector as a whole. Regards, David On 6/25/2012 03:24, mahbubul muttakin wrote: Dear all, -- *************************** 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 |