Honeywell AUTOMATIC CONTROL - Page 57

PSYCHROMETRIC CHART FUNDAMENTALS
47
ENGINEERING MANUAL OF AUTOMATIC CONTROL
Fig. 17.
X
Y
A
B
C
REFERENCE POINT
55°F DB
90°F DB
92°F DB
50% RH
0.0164 LB/LB
0.0065 LB/LB
1150
THIS LINE IS
PARALLEL
TO THE SOLID
LINE C-B ON
THE PSYCH
CHART
CONSTRUCTION LINE
C1841
S
E
N
S
I
B
L
E
H
E
A
T
T
O
T
A
L
H
E
A
T
∆H
S
∆H
T
=
1.0
0.8
0.6
0.5
0.4
0.3
0.2
0.1
5000
3000
2000
1500
1000
500
-1000
-0.1
-0.3
-0.5
-1.0
-2.0
-4.0
1.0
2.0
E
N
T
H
A
L
P
Y
H
U
M
I
D
I
T
Y
R
A
T
I
O
=
∆ h
∆ W
4.0
0
∞