Quantitative evaluations on available models for calculating thermodynamic properties of humid air

• Engineering calculation of the thermodynamic properties for cycle simulation and design requires simple but reliable models. This has been proved to be of importance for the research and development on humidified gas turbines, such as humid air turbine (HAT) cycles and compressed air energy storage (CAES). This paper has made a comprehensive review and comparison among different models for calculating thermodynamic properties of the humid air mixtures, including ideal gas model (IG), ideal mixing model (IM), and real gas model (RG); and based on temperature and pressure range, gave quantitative evaluations on saturated water vapor composition and enthalpy. Based on performance conditions of an HAT cycle, several suggestions were given for the use of the today's available models for engineering cycle calculations, which can provide accurate results for cycle performance analysis and design while keeping the methods straightforward.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Energiteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Energy Engineering (hsv//eng)

Nyckelord

EOS

Humid air

Thermodynamic properties

Compressed air

Environmental impact

Gas dynamics

Gas turbines

Gases

Thermodynamics

Wind turbines

Compressed air energy storages (CAES)

Humid air turbine cycles

Humidified gas turbines

Quantitative evaluation

Research and development

Temperature and pressures

Compressed air energy storage

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