Sunliang, Unfortunately, these files are becoming harder to find. It used to be that manufacturer's would provide printed or online documents containing tables of performance at different entering conditions. In my experience, a lot of manufacturer's have now developed in-house software tools that their sales representatives use to generate performance at a few design inlet conditions. I have had some luck in making the performance maps required by Type680 by asking a representative to run the software tool a lot of times. Regards, David On 10/21/2010 04:34, SUNLIANG CAO 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 |