Thesis (Diploma (Mechanical Engineering))--Cape Technikon, 1986. / This report investigates the possibility of constructing and developing a Performance-Boiler-Computer-Model of the Duvha Power Station Boiler from the PEPSE* computer software. This model is to act as a "tool" in investigations into certain as-designed and off design changes on the boiler's thermodynamic behaviour. It is evident from the results of the performance boiler model that, with further development to a model in design mode, this will be a very useful and versatile tool. This fact is evident from the results of the superheater 3 design mode model.