8-51
8.70
V
m
h
room
3
DA
3
o
3
m
o
m
a
m
2
m
m
2
m
ft
. DA = dry air.
=
ft
lb - mol
R
0.7302
ft
atm
lb
DA
lb - mol
atm
550 R
lb
DA
lb
H O
lb
DA
lb
H
O / lb
DA
=
⋅
⋅
=
=
=
141
140
29
1
101
0 205
101
0 0203
.
.
.
.
From the psychrometric chart,
F,
h
T
F
V
ft
/ lb
DA
T
F
H
Btu / lb
db
o
a
r
wb
o
3
m
dew point
o
m
T
h
=
=
=
=
=
=
=
−
≅
90
0 0903
67%
805
14 3
77 3
44 0
011
439
.
.
±
.
.
±
.
.
.
8.71
T
T
h
r
db
ab
C
C
He wins
=
°
=
°
⇒
=
35
27
55%
8.72
a.
T
T
h
h
T
r
a
wb
db
dew point
Fig. 8.4-1
2
C,
C
kg H
O
kg dry air
C
=
°
=
°
⇒
=
=
=
°
40
20
33%,
0 0148
255
.
.
b.
Mass of dry air:
m
da
=
=
×
−
2.00 L
1 m
1 kg dry air
10
L
0.92 m
kg dry air
3
3
3
2 2
10
3
.
↑
from Fig. 8.4-1
Mass of water:
2.2
10
kg dry air
0.0148 kg H
O
10
g
1 kg dry air
1 kg
g H
O
2
3
2
×
=
−
3
0 033
.
c.
±
.
.
.
H
40
78 0
0 65
77 4
°
≈
−
=
C, 33% relative humidity
kJ
kg dry air
kJ
kg dry air
b
g b
g
±
.
H
20
57 5
°
≈
C, saturated
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- '08
- staff
- dry air, Psychrometrics, Tdb
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