Level-by-level flowsheet synthesis methodology for thermal system design

A new level‐by‐level methodology for flowsheet synthesis presented. In the first level, an initial superstructure is constructed to form a master model. Optimization of the master gives an initial optimal flowsheet, which indicates major structural features. In the second level this initial flowsheet is analyzed using exergy analysis to identify relevent modification options. The Promising options are used to update the intial superstructure, which is optimized to obtain an improved design. The results from the above design process determine the flowsheet of overall system and provide targets for design of subsystems. Design of subsystems forms the third design level. The predetermined of subsystems. Design of subsystems froms the third design level due to use of simplistic models in the previous design levels. The master model is updated and then Optimized again. The overall design process terminates when designs for subsystems can meet the design targets determined by the master model.