Evaluation of thermodynamic equations for detailed calculating the ‎properties of synthetic - biological fuels

The use of fossil fuels such as petrol play a crucial role in ever-increasing global warming due to its irreparable, destructive environmental effects and emission of greenhouse gases, and it is considered as a serious and major threat to the environment. The use of biofuels as environmental friendly substances for taking advantage into vehicles has been highly regarded. In this paper, density of three bio-fuels were calculated (from 40 to 140 Mpa) with various thermodynamic equations such as Redlich-Kowng and Peng-Robinson and taking into account of various mixing rules and a viral EOS which named BWR-LS. Due to the specific pressure (pressure of diesel engine injector) activity equations such as Wilson for the unavailability of required constants was not appropriate. The results of conducted calculated is presented that, BWR-LS and PR-MHV2 in general mode for considered substances with having under 3 percentage error is proper (Dibutyl ether+1-butanol, 1-heptanol+ heptane).