Expressions of the molar exergy and of the molar flow exergy of a pure chemical fuel are deduced rigorously from the basic principles of thermodynamics; they show that exergy and flow exergy coincide when the temperature and the pressure of the fuel are equal to those of the environment. A simple method to evaluate the Gibbs free energy of reaction under non standard conditions is presented. The dependence of the molar exergy on the temperature and on the relative humidity of the atmosphere is investigated. For hydrocarbons, hydrogen and carbon monoxide, the coefficients of polynomial interpolations of the molar exergy as a function of the relative humidity are given in a table, for three temperature values. Linear interpolation can be used to determine the molar exergy of these fuels at different temperatures.
E. Zanchini, T. Terlizzese (2007). Exergy of pure chemical fuels. PRETORIA : s.n.
Exergy of pure chemical fuels
ZANCHINI, ENZO;
2007
Abstract
Expressions of the molar exergy and of the molar flow exergy of a pure chemical fuel are deduced rigorously from the basic principles of thermodynamics; they show that exergy and flow exergy coincide when the temperature and the pressure of the fuel are equal to those of the environment. A simple method to evaluate the Gibbs free energy of reaction under non standard conditions is presented. The dependence of the molar exergy on the temperature and on the relative humidity of the atmosphere is investigated. For hydrocarbons, hydrogen and carbon monoxide, the coefficients of polynomial interpolations of the molar exergy as a function of the relative humidity are given in a table, for three temperature values. Linear interpolation can be used to determine the molar exergy of these fuels at different temperatures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
