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P-h Diagram
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Humid Air
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Altitude
m
ft
Atmospheric Pressure
P
kPa(a)
Pa(a)
bar(a)
atm(a)
psi(a)
MPa(a)
Dry-bulb Temperature
Tdb
°C
K
°F
Wet-bulb Temperature
Twb
°C
K
°F
Relative Humidity
RH
%
0-1
Dew Point Temperature
Tdp
°C
K
°F
Humidity Ratio
W
g/kg
kg/kg
gr/lb
Enthalpy
Hda
kJ/kg_da
J/kg_da
BTU/lb_da
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A short guide to reading moist air properties and psychrometric charts.
Psychrometric Chart
Dew Point
Wet-bulb temperature (Twb)
RH vs Humidity Ratio (W)
Mixing OA & RA
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