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. It is shown that molar exergy and molar flow exergy coincide when the temperature T and the pressure p of the fuel are equal to the temperature TB and the pressure pB of the environment; a general relation between exergy and flow exergy is proved as a consequence. The deduction of the expression of the molar exergy of a chemical fuel for non-standard values of TB and pB is clarified. For hydrogen, carbon dioxide and several hydrocarbons, tables arereported to allow a simple calculation of the molar exergy of the fuel for any value of the temperature TB and the relative humidity 4B of the environment, in the range 268.15 K
E. Zanchini, T. Terlizzese (2009). Molar exergy and flow exergy of pure chemical fuels. ENERGY, 34, 1246-1259 [10.1016/j.energy.2009.05.007].
Molar exergy and flow exergy of pure chemical fuels
ZANCHINI, ENZO;
2009
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. It is shown that molar exergy and molar flow exergy coincide when the temperature T and the pressure p of the fuel are equal to the temperature TB and the pressure pB of the environment; a general relation between exergy and flow exergy is proved as a consequence. The deduction of the expression of the molar exergy of a chemical fuel for non-standard values of TB and pB is clarified. For hydrogen, carbon dioxide and several hydrocarbons, tables arereported to allow a simple calculation of the molar exergy of the fuel for any value of the temperature TB and the relative humidity 4B of the environment, in the range 268.15 KI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
