Abstract
Recent results are shown about the peculiarities of the pseudo-critical region, with special emphasis on properties important for energy production and conversion. The property-map of some materials, which are relevant as model fluids or as working / cooling fluids in energy engineering (argon, methane, water and carbon dioxide) and their relative positions to various adiabats – influencing their stability through the anomalous properties – are presented. Some potential technological problems related to the existence of these anomalies are discussed.
Highlights
The conversion of heat to a generally more "useable" form of energy, namely electricity, often requires thermodynamic cycles [1]
For example the archetype of thermodynamic cycles, the Carnot cycle consists of two isothermal and two adiabatic steps, while the Rankine cycle [2] – developed in the mid-19th century – which is applied in most commercial power plants using steam turbines, consists of two isobaric and two adiabatic steps
Adiabats running in the sub- and supercritical regions are shown in Fig. 9 (a)-(e) for model argon, real argon, for water, for carbon dioxide and for methane
Summary
The conversion of heat to a generally more "useable" form of energy, namely electricity, often requires thermodynamic cycles [1]. Adiabats running in the sub- and supercritical regions are shown in Fig. 9 (a)-(e) for model argon (van der Waals argon), real argon (calculated by Wagner-Setzmann reference REoS [19]), for water (calculated with IAPWS REoS [15]), for carbon dioxide (calculated with Wagner-Span REoS [22]) and for methane (calculated with WagnerSetzmann REoS [23]).
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