Hi Amandine, In order to solve the mass balance and energy balance that represent the process inside the cooling tower, Type51 uses correlations for the psychrometric properties. Type51 has to perform internal iterations in order to solve those two equations. It is possible that a combination of input conditions are resulting in a very difficult problem to find a solution for, and the iterations are going out of the limits considered appropriate for the correlations. Did you connect both the dry bulb temperature and the wet bulb temperature inputs of the model to the weather data reader?
My idea to debug this problem is that you use Type51b, and use the default parameters for the cooling tower. Find the time when the error is occurring, and look at the inlet conditions. Use this values to calculate yourself the outlet conditions in the cooling tower: you can use the mathematical reference (volume 5, section 5.4.17) to do the calculations. Perhaps you may find an input that is causing the problem. Please let me know if you have questions debugging this problem. Best regards, Diego Amandine LE DENN wrote: > Dear users, > > About type51b (cooling tower - user supplied coefficient), what can be > the different origin of this message: > "the correlation for the saturation temperature used in the cooling > tower model was used with an enthalpy value outisde the allowable range". > > I am using french meteo data and water temperature level > is basically [15°C - 28°C]. Mass transfert constant and exponant are > the default ones, sump volume is 200L. > > Trnsys is generating too many of this error, my simulation stop > automatically after 800 hours. > > Thank you for your help, > > Amandine LE DENN > INSA Toulouse > Mel: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > TECSOL > 105 avenue Alfred KASTLER > Tecnosud - B.P 434 > 66004 PERPIGNAN cedex > FRANCE > Tel: +33(0)4.68.68.16.40 > Fax: +33(0)4.68.68.16.41 > ------------------------------------------------------------------------ > > _______________________________________________ > TRNSYS-users mailing list > [email protected] > https://www.cae.wisc.edu/mailman/listinfo/trnsys-users > -- Diego A. Arias TRNSYS Coordinator Solar Energy Laboratory University of Wisconsin - Madison 1500 Engineering Drive Madison, WI 53706 _______________________________________________ TRNSYS-users mailing list [email protected] https://www.cae.wisc.edu/mailman/listinfo/trnsys-users
