Chemical exergy calculations of petroleum liquid fuels

Energy is an important subject these days. Nowadays while the fossil energy sources are more and more getting decreased, to increase the usage of renewable sources of energy and to make them to be used efficiently became a wide spread subject of study. The efficiency of the processes applied to use the fuels obtained from fossil energy sources is getting more important due to the decrease of these sources. The efficiency of processes is calculated based on thermodynmic laws. The first and the second laws of thermodynamics are used for exergy analysis. The chemical exergy analysis of chemical change processes like the processes where combustion reactions or concentration change reactions take place, have high importance. The maximum useful work obtainable from a chemical change process can be calculated by a chemical exergy analysis. To do this type of analysis, the chemical exergy values of all related chemical substances are needed. Therefore, the knowledge of the chemical exergy values of petroleum derived fractions have an important value. In this work, the chemical exergy calculation methods and also the methods that can be applied to petroleum and petroleum fractions were given. The importance of the thermodynamic data in the calculation of chemical exergies and the limitations done of the absence of this kind of data to the methods to be applied were also determined in this work. Chemical exergy values were calculated for petroleum derived fuels for which thermodynamic data were available, by using methods given here before. Furthermore, the values of chemical exergy were calculated and tabulated for the components of petroleum derived fuels. Keywords: Chemical exergy, chemical exergy calculations, petroleum, petroleum fractions, chemical exergy calculations of petroleum fractions.