94
Chapter 5
Figure 5-3.
Refrigerant line pressure drops for “Freon” 22 refrigerant (reprinted by permission of DuPont
Fluorochemicals).
0.2
0.3
0.4
0.6
0.8
1
2
3
4
6
8
10
20
30
40
60
80
100
2000
3000
4000
6000
8000
10,000
BTU's Per HR
0.2
0.2
0.3 0.4
0.6 0.8 1
2
3
4 5
8 10
20
30 40 50
6
0.3
0.4
0.6
0.8
1
2
3
4
5
6
8
10
20
30
40
50
At 80
°
F Condenser
At 100
°
F Condenser
At 120
°
F Condenser
6
1
/8
"
5
1
/8
"
4
1
/8
"
3
5
/8
"
2
5
/8
"
1
5
/8
"
1
1
/8
"
7 /8
"
3 /4
"
5 /8
"
1 /2
"
3 /8
"
-6
0
ºF
E
va
p
o
ra
to
r
Te
m
p
e
ra
tu
re
-4
0
ºF
1
3
/8
"
O
.D
. T
yp
e
L
C
op
pe
r T
ub
in
g
3
1
/8
"
2
1
/8
"
Tons of Refrigeration
Pressure Drop In Lbs. Per Sq. In. Per 100 Ft.
EXAMPLE:
5.5 Tons at -40
°
F Evap. 85
°
F Cond.
2
5/8
" Suction Line Pressure Drop = 0.18 p.s.i./100 ft.
5/8
" Liquid Line Pressure Drop = 1.7 p.s.i./100ft.
-2
0
ºF
2
0
ºF
4
0
ºF
D
is
ch
a
rg
e
lin
e
s 8
0
ºF
C
o
n
d
e
n
se
r
1
0
0
ºF
C
o
n
d
e
n
se
r
1
2
0
ºF
C
o
n
d
e
n
se
r
L
iq
u
id
L
in
e
0
ºF
NOTE: Pressure drops do not allow
for pulsating flow. If flow is
pulsating, use next larger
pipe size. Liquid line
determined at 0
°
F evap. &
80
°
F cond. Discharge lines
at 0
°
F evap. Other
conditions do not
appreciably change result.
Vapor evap. outlet assumed
to be at 65
°
F.