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30 40 50 60 70 80 90 100 110 115
DRY BULB TEMPERATURE - F
10 15 20 25
30
35
40
45
50
55
E
N
T
H
A
L
P
Y
-
B
t
u
p
e
r
l
b
.
o
f
d
r
y
a
i
r
a
n
d
a
s
s
o
c
i
a
t
e
d
m
o
i
s
t
u
r
e
ENTHALPY - Btu per lb. of dry air and associated moisture
10
15
20
25
30
35
40
45
50
55
EN
THAL
PY
- Btu
per
lb. o
f dry
air
and
asso
ciat
ed m
oist
ure
WET
BU
LB T
EMP
ERAT
UR
E -
F
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
H
U
M
I
D
I
T
Y
R
A
T
I
O
(
o
r
S
p
e
c
i
f
i
c
H
u
m
i
d
i
t
y
)
G
R
A
I
N
S
O
F
M
O
I
S
T
U
R
E
P
E
R
P
O
U
N
D
O
F
D
R
Y
A
I
R
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
1.25
1.30
V
A
P
O
R
P
R
E
S
S
U
R
E
-
I
N
C
H
E
S
O
F
M
E
R
C
U
R
Y
0
10
20
25
30
35
40
45
50
55
60
65
70
75
80
85
D
E
W
P
O
I
N
T
T
E
M
P
E
R
A
T
U
R
E
-
F
Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com
STANDARD AIR
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.300.250.20SENSIBLE HEAT RATIO = Qs / Qt
S
E
N
S
I
B
L
E
H
E
A
T
R
A
T
I
O
=
Q
s
/
Q
t
10% RELATIVE HUMIDITY
20%
30%
40%
50%
60%
70%
80%
90%
WET BULB TEMPERATURE - F
20
25
30
32
35
40
45
50
55
60
65
70
75
80
85
90
12.6
12.8
13.0
13.2
13.4
13.6
13.8
14.0
14.2
14.4
14.6
14.8
15.0
BAROMETRIC PRESSURE: 29.921 in. HG
Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com
