Professional Quality Psychrometric Calculator

Calculate Thermodynamic Properties of Moist (Humid) Air





Thermodynamic Properties of Moist (Humid) Air

The site provides a feature rich, professional quality Psychrometric Calculator web application.

The HumidAirWeb application calculates 35 thermodynamic properties of humid (moist) air. It allows 21 different combinations of input variables to be used for calculations.

Input variables that can be used are:

  • Pressure
  • Dry bulb temperature
  • Wet bulb temperature
  • Dew point temperature
  • Relative humidity
  • Humidity ratio
  • Enthalpy
  • Entropy
  • Volume




Used Formulations

The "Psychrometric Calculator" is based on the formulations developed by Hyland and Wexler. These formulations are approved by ASHRAE as documented in the 1997 ASHRAE Handbook "Fundamentals". Hyland and Wexler 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.




Service

The Registration is valid for 5 months (150 days), and it will not be extended automatically. After 5 months if you wish to continue using the premium features of the application you will have to register and create a new account again.

The Registration includes free technical support for the duration of the subscription.





Available Package

$29.95 (150 Days)

This is a 5 months subscription fee for using the HumidAir Web (Psychrometric Calculator) online.

  • No limitations for calculation of thermodynamic properties.
  • Heating / Cooling process calculations.
  • Mixing stream calculations.
  • Save data to Excel.




User Settings

The following user settings, from the last session, are automatically restored:

  • Units
  • Theme
  • Setup Panel visibility
  • Output Panel visibility
  • Registered users can select a new option during Login process, to be automatically logged-in in the future




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