98
Chapter 5
IV.
Refrigerant Line Velocities
Figure 5-7.
Refrigerant line velocities for “Freon” 12 refrigerant (reprinted by permission of DuPont
Fluorochemicals).
0.1
0.2
2000
3000
4000
6000
8000
10,000
BTU's Per HR
0.4
0.6
1
2
4
6
10
20
40
60
100
15
20
30
40
50
60 70
80
100
150
200
300
400
500
600
1000
1500
2000
3000
4000
5000
6000 7000
8000
10,000
800
700
15
20
30
40
50
60 70
80
100
150
200
300
400
500
600
1000
1500
2000
3000
4000
5000
6000 7000
8000
10,000
800
700
At 80
°
F Condenser
EXAMPLE:
5.5 Tons at -40
°
F Evap. 85
°
F Cond.
3
1/8
" Suction Line Velocity = 1916 ft./min.
3/4
" Liquid Line Velocity = 94 ft./min.
At 100
°
F Condenser
At 120
°
F Condenser
6
1
/8
"
-6
0
°
F
E
va
po
ra
to
r T
em
pe
ra
tu
re
-4
0
°
F
-2
0
°
F
0
°
F
20
°
F
40
°
F
80
°
F
C
on
de
ns
er
5
1
/8
"
4
1
/8
"
3
5
/8
"
1
3
/8
"
3
/4
"
5 /8
"
3
1
/8
"
2
5
/8
"
2
1
/8
"
1
5
/8
"
1
1
/8
"
7 /8
"
O
.D
. T
yp
e
L
C
op
pe
r T
ub
in
g
1
/2
"
3
/8
"
Tons of Refrigeration
Velocity In Feet/Minute
10
0
°
F
C
on
de
ns
er
Li
qu
id
L
in
e
D
is
ch
ar
ge
L
in
es
1
20
°
F
C
on
de
ns
er
NOTE: Liquid line determined at
0
°
F evap. and 80
°
F cond.
Discharge lines at 0
°
F
evap. Net refrigeration for
"Freon" 12 includes
suction gas at 65
°
F.
