Introduction to the “Exergy” Concept

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1. Ch.2 Thermodynamics Revisited (p 7-13), and 2. Ch 6 Exergy, a Convenient Concept (p

59-62), Jakob de Swaan Arons, 2004 3. Ch 6 Thermodynamic Analysis of Resources

Used in Mfg Processes, Gutowski & Sekulic, in TDR 2011 4. Appendix, Tables of Standard Chemical Exergy, Szargut, Morris & Steward, 1988

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Exergy Accounting

? Exergy Units: Joules J, rate in Watts, W ? Exergy symbols: B, Ex, X, and b, ex, x ? Also called lAvailabilityz by Keenan, 1941

and lAvailable Energyz, R, by Gyftopoulos and Beretta, 1991

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lExergy is the amount of work obtainable when some matter is brought to a state of thermodynamic equilibrium with the common components of the natural surroundings by means of reversible processes, involving interaction only with the above mentioned components of naturez [Szargut et al 1988].

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System State

Maximum work obtainable between System and Reference States.

Reference State

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System State

The minimum work needed to raise System from the reference state to the System State

Reference State

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Exin ! Exout = Exlost

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? Systems ? Heat Interactions ? Exergy of heat interaction ? Entropy and Enthapy ? Physical and Chemical Exergy

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