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Objectives of this course are: (1)Learn about what Chemical Engineers do (2) Learn about basic chemical process units (3) Learn to analyze and solve material balance and energy balance problems. This handout includes: Psychrometric, Chemistry, Math, Business, Heat and Humidity, Sling Psychrometer, Wet Bulb Temperature, Sling Psychrometer, Air-Water Systems, Psychrometric Chart
Typology: Slides
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dry
wet bulb
Wet wick
Water
Thermometer
Air Flow
(yes, I know the obvious nickname)
Air-Water systems at 1 atm
(h
a = kg of H
2 O/kg of dry air)
For this chart only!
0
ˆ
0
ˆ
1 ,
0
,
1 ,
0
,
2
^
atm
C
at
gas
air
atm
C
at
L
O
H
H H
^
A. Trace the line of 40% relative humidityB. Trace the line of 22
C wet bulb temperature
What if I want an enthalpy that is not
saturated? (e.g., at 50% RH?)
H
dev
given on chart
true
= H
sat’d
H
dev
Trace the line of Enthalpy Deviation = -.4 kJ/kg Dry Air
Find point where T = 85
F and 30% RH
What is the dew point for this condition? Note that the dew point has the sameabsolute humidity (lb
m
moisture/lb
m
dry air)
but a different T
T
dp
= 50
F
A. 28
C, 70% RH
Absolute humidity (h
a
) 0.0165 kg H
2
O/kg dry air
Wet bulb temperature (T
wb
)
C
Dew point temperature (T
dp
) 21.
C
Saturated enthalpy (H
sat
)
71 kJ/kg dry air
Specific enthalpy (H)
71-0.19 = 70.81 kJ/kg d.a.
Humid volume (V
h
)
0.875 m
3
/kg d.a.
A
C. T = 90
F and 80% R.H.
D. T = 60
F and 20% R.H.
C
D
H
a
(
lb H
2
O/lb dry air
)
V
h
(
ft
3
/lb
m
d.a.
)
H (
Btu/lb dry air)
48.5 -.
16.8 -.
C
D
ref
p
m
m
