Vaisala DRYCAP DMT340 SERIES Guide de l'utilisateur télécharger pdf (Page 167)

Appendix A ______________________________________________________ Calculation Formulas

VAISALA ______________________________________________________________________ 167

The water vapor pressure is calculated using:

100

RHP 

(7)

Parts per million by volume is calculated using:



ppm





(8)

Symbols:

= dewpoint temperature (°C)

= water vapour pressure (hPa)

Pws

= water vapour saturation pressure (Pa)

= relative humidity (%)

= mixing ratio (g/kg)

= atmospheric pressure (hPa)

= absolute humidity (g/m3)

= temperature (K)

= enthalpy (kJ/kg)

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Vaisala DRYCAP DMT340 SERIES Guide de l'utilisateur Page 167