Dear all, I am glad to know that TRNOPT is an interface between TRNSYS and GenOpt. But I don't know how to get started. There is no input of TRNOPT and no output file either. Is there anyone know how to do the optimization of the system with TRNOPT and GenOpt? Thanks in advance. Miaomiao He Ph.D student Institute of Energy and Sustainable Development De Montfort University