This paper deals with a special field of the second-law analysis: the
exergy method and analysis. The concept of exergy has been included in
textbooks of engineering thermodynamics worldwide. Nevertheless, the
application of exergy in investigations of industrial processes is sti
ll unsatisfactory. As a result of this, there are many incorrect discu
ssions in the field of energy saving. In order to improve this situati
on this paper presents some possibilies for the application of exergy
and for the correct discussion of their results.