Abstract
Exergy analysis is a general method for efficiency analysis of systems and processes. The use of the exergy concept and the analysis of ultimate efficiencies of processes is more or less still limited to the academic world. There are several reasons why its industrial use is still limited. To overcome some of the difficulties in industrial applications of energy analysis, it has made use of exergy analysis. The chemical exergy of a substance is the maximum work that can be obtained from it by taking it to chemical equilibrium with the reference environment at a constant temperature and pressure. The first law analysis gives only the quantity of energy, while the second law defines the quality of energy also. The projected increase in coal utilization in power plants makes it desirable to evaluate the energy content of coal both quantitatively and qualitatively. In the present study, the chemical exergies of some coals of good quality in Turkey were calculated with the BASIC program by using second law analysis and the results were given as tabulated.
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