Exergy in substance change processes

Abstract

The exergy concept applied to substance change processes has been presented and discussed in detail. The very good known exergy partition into the thermal, mechanical and chemical one was revised. The special behavior of all the parts could be stated and the concentration part of the so– called chemical exergy carefully considered. The natural environment was discussed due to its importance for the special behavior of this concentration exergy part. The meaning of the specie concentration in the natural environment has been emphasized and compared with the appropriate role of the natural environment temperature. The considerations presented are the base for generalized analysis and rating of substance change processes.