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Hamza, That warning is usually not a problem. Each input and each output of a Type normally has a three letter code associated with it to indicate to the TRNSYS kernel what the units are. For example, if an output is a temperature in degrees C then the output has a code of "TE1." If the output is power in kJ/h then it has a code of "PW1." The TRNSYS kernel checks to make sure that all of your input/output connections have matching units (PW1 connected to PW1, etc.) and it warns you if there is a mismatch. Some non-standard Types don't have those codes set right and some of them just use a default of "DM1" (dimensionless) for all inputs and outputs. If you look at the actual list file (instead of the Studio's log file display) you'll see where the units mismatch is reported. If you can't find it, send the *.lst file to me and I'll see if I can point it out best, David On 4/30/2011 18:11, hamza aouissi wrote: hi everybody, -- *************************** 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 |