Sophie, 8 hours seems long to me as well. Would you mind sending me your input file so that I can see what the zone parameters (loss, size, etc.) are? Cheers, David
At 13:32 4/2/2007, Sophie Masson wrote: >Hi Folks, > >I am modeling a zone both in TRNSYS and in Matlab with ventilation but >no infiltration and no occupancy or lighting gains. >(conditions: >- initial room temperature = 10C >- outside air temperature = 10C >- ventilation air temperature = 26C >- ventilation air change = 3 ACH/hr (432 kg/hr) ) > >In TRNSYS, I have 2 different zone models (Type 56 and Type 88, lumped >capacitance). The model in Matlab is a lumped capacitance model (with a >1 second - simulation time step). > >I am using the same inputs (building dimensions, capacitance, loss >coefficient...) for the 3 models. The room air temperature reaches the >setpoint (20C) in 20 min with the Matlab model and ... 8hr with the >TRNSYS model (whatever time step or wall base I choose). >Why such a difference? Is it linked to the way TRNSYS calculates the >results (hourly based and not calculate the energy accumulation each >second)? >8hr seems to be not reasonable, but I can not figure out where the >problem comes from. > >Thanks for your help, > >Sophie > >-- >Sophie V. Masson >Research Engineer >Center for Building Performance and Diagnostics >Carnegie Mellon University >5000 Forbes Avenue >Pittsburgh, PA 15213 >Phone: 412 268 3939 >Fax: 412 268 6129 >Email: [EMAIL PROTECTED] > > >_______________________________________________ >TRNSYS-users mailing list >[email protected] >https://www.cae.wisc.edu/mailman/listinfo/trnsys-users **************************************************************************************** Thermal Energy System Specialists (TESS), LLC David BRADLEY 2916 Marketplace Drive - Suite 104 Partner Madison, WI 53719 Phone: (608) 274-2577 USA Fax: (608) 278-1475 E-mail: [EMAIL PROTECTED] Web Pages: http://www.tess-inc.com and http://www.trnsys.com "Providing software solutions for today's energy engineering projects" **************************************************************************************** _______________________________________________ TRNSYS-users mailing list [email protected] https://www.cae.wisc.edu/mailman/listinfo/trnsys-users
