Exergy is a system thermodynamic property defined only with respect to the system’s surroundings. For a specified system state, exergy is the maximum potential useful work available from the system as it achieves equilibrium with the surroundings. For students exergy can be a very abstract concept. This paper presents a graphical means to clarify the concept of exergy for a closed system, demonstrating exergy at any state i corresponds to the sum of the net work of a power cycle that incorporates a process from system state i to the dead state and the net work of a refrigeration/heat pump cycle required to move the system from the dead state to state i.
Graphical Interpretation of Exergy
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Boettner, DD, Bluman, J, Rowland, M, Bodenhamer, J, & Arnas, AO. "Graphical Interpretation of Exergy." Proceedings of the ASME 2011 International Mechanical Engineering Congress and Exposition. Volume 5: Engineering Education and Professional Development. Denver, Colorado, USA. November 11–17, 2011. pp. 73-83. ASME. https://doi.org/10.1115/IMECE2011-63099
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