The graphical construction called an energy-utilization diagram (EUD)is IntroductionTo evaluate the energy efficiency of a process, energy analysis based on the first law of thermodynamics used to be considered. However, in the past two decades it has been found that the second law of thermodynamics, which is related directly to the term of exergy, can confirm the quality of energy in process analyses. Subsequently, the basic concept of exergy has been widely applied in chemical process analysis and synthesis. Processes using mainly thermal energy are good targets for exergy analysis. This is especially true and suitable for the integration of heat exchangers, for example.The term exergy, used by Rant in 1956, is made up of two parts: ex-Latin prefix for from or out, akin to Greek Et(ex)

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