The authors present an optirrusanon method, based on the thermodynamic consideration and applied to the inlet and exhaust systems of turbocharged engine. The goal function in this method is defined as a sum of exergy irreversible losses - occurring in the whole flow path. The decision variables, optimisation parameters and, also, the constraint conditions in the discussed method are defined and determined. The validation results of specially written and unique programmes, used for flow simulations in the analysed systems, are also presented. The optimisation results, based on the discussed method and related to a specific turbocharged engine are discussed in part II.

The authors present the optimisation procedure and results, applied to the system discussed in part I. This procedure utilises a "fixed variables" method from the group of "search methods". The optimisation is related to the specific turbocharged engine STAR T3 70 for which necessary construction data and experimental measurements were available. Calculation results, however, are based mainly on the computer simulation of time dependant flows in the inlet and exhaust systems of this engine. They show that the presented method, after necessary improvements and the use of more advanced optimisation procedures, could represent an additional and attractive tool, which might be used by designers of such systems.