Tecumseh AEA4440YXA - Chapter 5: Installation and Replacement Information (Cont.); III. Refrigerant Line Pressure Drops

A LOOK AT SERVICE SAFETY
Installation and Replacement Information 93
III. Refrigerant Line Pressure Drops
Figure 5-2. Refrigerant line pressure drops for “Freon” 12 refrigerant (reprinted by permission of DuPont
Fluorochemicals).
.2 .3 .4 .6 .8 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 6 8
10 20 30 40 50
0.3 0.4 0.6 0.8
1 2 3 4 5 6 8
10 20 30 40 50
EXAMPLE:
5.5 Tons at -40°C Evap. 85°F Cond.
3
1
/8
" Suction Line Pressure Drop = 0.155 p.s.i./100 ft.
3
/4
" Liquid Line Pressure Drop = 1.0 p.s.i./100 ft.
At 120°F Condenser
At 100°F Condenser
At 80°F Condenser
6
1
/8
"
5
1
/8
"
4
1
/8
"
3
5
/8
"
3
1
/8
"
2
1
/8
"
1
5
/8
"
1
1
/8
"
7
/8
"
3
/4
"
5
/8
"
1
/2
"
3
/8
"
-6
0
°F
E
va
p
o
ra
to
r T
e
m
p
e
ra
tu
re
-4
0°F
4
0
°F
D
isch
a
rg
e L
in
e
s 80
°F
C
o
n
d
e
n
se
r
1
00
°F
C
o
n
d
e
n
se
r
12
0°F
C
o
n
d
e
nser
L
iqu
id
Lin
e
-2
0
°F
20
°F
0
°F
1
3
/8
" O
.D
. T
yp
e L C
opper T
ubing
2
5
/8
"
Tons of Refrigeration
Pressure Drop In Lbs. Per Sq. In. Per 100 Ft.
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.