Authors: Matthew David Marko
The Stirling thermodynamic heat engine cycle is modified, where instead of an ideal gas, a real, supercritical, monatomic working fluid subjected to intermolecular attractive forces is used. The potential energy of real gases is redefined to show it decreasing with temperature as a result of the attractive Keesom forces, which are temperature dependent. This new definition of potential energy is used to thermodynamically design a Stirling cycle heat engine with supercritical xenon gas, and an engine efficiency that exceeds the Carnot efficiency is demonstrated. The change in internal energy predicted is compared to experimental measurements of condensing steam, xenon, argon, krypton, nitrogen, methane, ethane, propane, normal butane, and iso-butane, and the close match validates this new definition of temperature-dependent real gas potential energy, as well as the thermodynamic feasibility of the modified supercritical Stirling cycle heat engine.
Comments: 22 pages, 4 tables, 3 figures
[v1] 2017-09-12 09:12:20
Unique-IP document downloads: 60 times
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