Psychrometric Chart
Psychrometric Chart
This Demonstration of a psychrometric chart calculates the relative humidity [%], absolute humidity [kg water/kg dry air], dry bulb temperature [ºC], and specific volume SV [m³/kg dry air] for different pairs of temperature and absolute humidity at a pressure of 101.325 kPa.
RH
AH
DBT
You can drag the locator to see values at points on the saturation line and points with relative humidity less than 100%. The blue line represents the saturated air; the purple lines are the lines with relative humidity equal to 80%, 60%, 40%, 20%, and 10%.
The equations used to simulate this psychrometric chart are:
RH=
100×101325AH
(0.22+AH)exp0.43--5.17log(DBT+273.15)
834.27
DBT+273.15
SV=(DBT+273.15)(1+1.6078AH)
287.05
101325