Based on exergy balanced equation

the feed-water heating system of one steam turbine unit has been analysed by using the exergy efficiency

the general exergy matrix equation used for thermodynamic system of the steam turbine unit being given.The said equation reflects the influence of the thermodynamic system upon the thermal economic efficiency of unit

its structure being simple

not only simplifying the traditional exergy calculation of thermodynamic system of steam turbine unit

but also providing basis for drawing up the calculation programme of thermodynamic system for a general unit

as well as providing theoritical basis for exergy analysis of the thermodynamic system for steam turbine units

especially for carrying out localized quantitative exergy analysis.