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Psychrometrics

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Application - HumidAir v1.2

Thermodynamic Properties of Humid (Moist) Air

The application provides ease access to 35 thermodynamic properties of humid (moist) air, based on the most accurate formulations available. Simple user interface, extreme accuracy and speed should make calculations much more enjoyable. All registered users receive free technical support, and all major and minor updates for 1 full year from the time of registration. Read more...

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Excel Add-In - HumidAir v2.0

Thermodynamic Properties of Humid (Moist) Air

The library calculates 35 thermodynamic properties of humid (moist) air, based on the most accurate formulations available. There is no learning curve involved since library is fully integrated with Excel, all available functions are used in the same way as any other Excel function. Few examples (provided with the library) should get you up to speed in the matter of minutes. All registered users receive free technical support, and all major and minor updates for 1 full year from the time of registration. Read more...

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Used Formulations

The application and the Excel Add-In library use the most exact formulations of thermodynamic properties of moist air currently available.

Formulations are based on the study performed by Hyland and Wexler, and approved by ASHRAE (American Society of Heating, Refrigeration and Air-conditioning Engineers) as documented in the 1997 ASHRAE Handbook "Fundamentals". They presented the equation of state in:

• Formulations for the thermodynamic properties of the saturated phases of H2O from 173.15 K to 473.15 K, W. Hyland and A.Wexler, ASHRAE Transactions, 89(2A) 500-519, 1983.
• Formulations for the thermodynamic properties of dry air from 173.15 K to 473.15 K, and of saturated moist air from 173.15 K to 372.15 K, at pressures to 5 MPa, R. W. Hyland and A. Wexler, ASHRAE Transactions, 89(2A) 520-535, 1983.