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–1
0
–5
0
5
10
–10
0.75 0.80
–5 0 5 10 15 20
Dry Bulb Temperature, ° C
Below 0° C Properties and Enthalpy Deviation Lines Are For Ice Humid Volume, m3/kg Dry Air
25 30 35 40
10
15
20
25
25
30
35
40
145140135130125120
35 40 45 50 550.033
0.032
0.031
0.030
0.029
0.028
0.027
0.026
0.025
0.024
0.023
0.022
0.021
0.020
0.019
0.018
0.017
0.016
0.015
0.014
0.013
0.012
0.011
0.010
0.009
0.008
0.007
0.006
0.005
0.004
0.003
0.002
0.001
0.00
11
5
11
0
10
5
10
0
95
90
85
80
75
70
65
60
55
50
En
th
al
py
 A
t S
at
ur
at
io
n,
 k
J/k
g 
Dr
y 
Ai
r
45
0.85 0.90
45 50 55
M
oi
st
ur
e 
C
on
te
nt
, 
k
g
/k
g
 D
ry
 A
ir–
1
.0
E
nt
ha
lp
y
D
ev
ia
ti
on
kJ
/k
g
D
ry
A
ir
10%
–1
.2
0 . 9 5
–0
.8
–0
.6
–0
.4
–0
.2
–0
.1
–0
.0
5
+1.0+0.8
+0.6
+0.4
+0.2
20
%
30
%
40
%
60
%
70
%
80
%
90
%
50
%
 R
el
at
iv
e 
H
um
id
ity
30
25
20
15
10
5
0
–5
Wet
Bulb
or S
atu
rati
on
Tem
per
atu
re,
°
C
40
FI
G
UR
E 
8-
4.
1
Co
py
rig
ht
©2
00
0 
Jo
hn
 W
ile
y 
& 
So
ns
, I
nc
.
 
7
8
9
10
11
12
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
34
110
00
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
.001
.002
.003
.004
.005
.006
.007
.008
.009
.010
.011
.012
.013
.014
.015
.016
.017
.018
.019
.020
.021
.022
.023
.024
.025
10510095908580757065605550454035302520
Dry Bulb
Wet Bulb,
Dew Point or
Saturation
Temperature
E
nt
ha
lp
y
de
vi
at
io
n
B
tu
pe
r
po
un
d
of
dr
y
ai
r
–0
.3
B
tu
10%
+0.5
 Btu
+0.
4 B
tu
+0.
3 B
tu+
0.2
 Bt
u
+0
.1 
Btu
–.0
2 
Bt
u
–.
04
 B
tu
–.
06
 B
tu
–.
08
 B
tu
20%
30%
40
%
50
%
60
%
70
%
80
%
90
%
 R
el
at
ive
 h
um
id
ity
 
20%
40%
60%
80%
25
30
35
40
45
50
55
60
65
70
75
80
85 90 95 100 105
Pounds of
moisture
per pound
of dry air
Grains of
moisture
per pound
of dry air
Enthalpy at saturation,
Btu per pound of dry air
C
op
yr
ig
ht
 1
9
4
7
 C
ar
ri
er
 C
or
po
ra
ti
on
—
C
op
yr
ig
ht
 1
9
5
9
 C
ar
ri
er
 C
or
po
ra
ti
on
—
A
C
 4
6
7
 
P
ri
nt
ed
 in
 U
.S
.A
.
14
.5
 c
u 
ft.
 p
er
 p
ou
nd
 o
f d
ry
 a
ir
14
.0
 c
u 
ft
13
.5
 c
u 
ft
13
.0
 c
u 
ft
12
.5
 c
u 
ft
Dry Bulb Temperature, ° F
Humid Volume, ft3/lbm Dry Air 
FI
G
UR
E 
8-
4.
2
Co
py
rig
ht
©2
00
0 
Jo
hn
 W
ile
y 
& 
So
ns
, I
nc
.