Article
Version 1
Preserved in Portico This version is not peer-reviewed
Methods to Calculate Entropy Generation
Version 1
: Received: 20 February 2024 / Approved: 21 February 2024 / Online: 22 February 2024 (04:31:01 CET)
A peer-reviewed article of this Preprint also exists.
Osara, J.A.; Bryant, M.D. Methods to Calculate Entropy Generation. Entropy 2024, 26, 237. Osara, J.A.; Bryant, M.D. Methods to Calculate Entropy Generation. Entropy 2024, 26, 237.
Abstract
Entropy generation, formulated by combining the first and second laws of thermodynamics with an appropriate thermodynamic potential, emerges as the difference between a phenomenological entropy function and a reversible entropy function. The phenomenological entropy function is evaluated over an irreversible path through thermodynamic state space via real time measurements of thermodynamic states. The reversible entropy function is calculated along an ideal reversible path through the same state space. Entropy generation models for various classes of systems—thermal, externally loaded, internally reactive, open and closed––are developed via selection of suitable thermodynamic potentials. Here we simplify thermodynamic principles to specify convenient and consistently accurate system governing equations and characterization models. The formulations introduce a new and universal Phenomenological Entropy Generation (PEG) theorem. The systems and methods presented––and demonstrated on grease degradation, battery charging and discharging, metal fatigue and pump flow––can be used for design, analysis, and support of diagnostic monitoring and optimization.
Keywords
entropy generation; non-equilibrium thermodynamics; phenomenology; second law; thermodynamic potentials; energy dissipation
Subject
Physical Sciences, Applied Physics
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Comments (0)
We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.
Leave a public commentSend a private comment to the author(s)
* All users must log in before leaving a comment
