JOHNSON CONTROLS
161
SECTION 7 – MAINTENANCE
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
8
FIGURE 64 -
DUHRING DIAGRAM / PTX CHART (°C)
10.0
15.6
21.1
26.7
32.2
37.8
43.3
48.9
54.4
60.0
65.6
71.1
76.7
Useful
Conversion
Formulas
To
convert
°C
(Centigrade)
to
°F
(Fahrenheit)
or
°F
to
°C:
°C
=
°F
+
4
0
–
40
°F
=
(°C
+
40)
x
1.8
–
40
1.8
1
atm
(atmosphere
at
sea
level)
=
14.696
psia
=
0
psig
=
760
mmHg
=
29.92
in
Hg
1
mm
Hg
=
1000
microns
=
0.3937
inch
Hg
=
.01934
psi
1
in
Hg
=
25.4
mm
Hg
=
.491
psi
1
psi
=
2.036
in
Hg
=
51.7
mm
Hg
=
2.31
ft
H
2O
1
ft
H
2O
=
.433
psi
1
lb
=
.4536
Kg
=
453.6
gms
1
liter
=
.2641
U.S.
g
al
=
1.057
U.S.
quarts
1
U.S.
g
allon
=
3.785
liters
1
inch
=
25.4
mm
1
ton
refrigeration
(12,000
Btu/hr)
=
3.52
kW
Absorption
Liquid
Chillers
Duhring Diagram/PTX Chart
4.4
82.2
87.8
93.3
98.9
104.4
110.0
115.6
121.1
126.7
132.2
137.8
143.3
148.9
154.4
160.0
165.6
171.1
176.7
-1.1
4.4
10.0
15.6
21.1
26.7
32.2
37.8
43.3
48.9
54.4
60.0
65.6
71.1
76.7
82.2
87.8
93.3
98.9
104.4
0.6
0.8
1.1
1.3
2.0
4.0
5.3
6.7
8.0
9.3
10.7
12.0
13.3
20.0
26.7
40.0
53.3
66.6
80.0
93.3
106.6
120.0
132.7
2.7
SOLUTION TEMPERA
TURE °C
CR
YST
ALLIZA
TION
AREA
SA
TURA
TION PRESSURE kPa
REFRIGERANT TEMPERA
TURE °C
93.3
98.9
104.4
110.0
115.6
121.1
126.7
132.2
137.8
143.3
148.9
154.4
160.0
165.6
171.1
176.7
40%
45%
50%
55%
60%
65%
40%
45%
50%
55%
60%
65%
70%
