AE202
Name______________________
Lecture 2.1
Psychrometry
Date_______________________
Reading: MEEB
(10
th
Edition) Section 8.12
Psychrometry
Definition
Psychrometric Chart
1. Dry Bulb
T
db
– air temperature
2. Wet Bulb
T
wb
– temperature of wet bulb thermometer
3. Saturation Line
Points at which air cannot hold additional moisture
4. Relative Humidity (%)
At a specific temperature, the amount of moisture in the air as a percentage of
the maximum or saturation amount
5. Dew Point (°F)
Given a psychrometric condition (T
db
, T
wb
), the temperature (lower) at which dew
will form
6. Specific Volume (v)
The reciprocal of density
(ft
3
/lb)
7. Humidity Ratio (W)
(lb/lb)
Amount of moisture by weight within a given weight of air
8. Enthalpy (h)
(BTU/lb)
Total heat (sensible and latent) in the air-moisture mixture

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Problem 1-5
Find the properties of room air at 70°F, 50% RH [show units]
1. Wet Bulb temperature ___________________ [
]
2. Humidity Ratio
________________________ [
]
3. Specific Volume
______________________
[
]
4. Enthalpy ______________________________ [
]
5. Dew Point
____________________________
[
]