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

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 K
E. Zanchini; T. Terlizzese
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/77471
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