102
Chapter 5
Figure 5-11.
Refrigerant line velocities for HFC-134a refrigerant (reprinted by permission of DuPont Fluorochemicals).
0.1
0.2
0.3
0.4
0.5
0.6
1
2
3
4
6
8
10
20
30
40
60
80
100
200
300
400
600
800
1000
0.2
0.1
0.2
0.3
0.4
0.6
0.8
1
2
3
4
6
8
10
20
30
40
60
80
100
0.3
0.4
0.6
0.8
1
2
3
4
6
8
10
20
30
40
60
80
100
At 30
°
C Condenser
EXAMPLE:
45 kW at -30
°
C Evap., 40
°
C Cond.
3
1/8
" Suction Line Velocity = 18 m/s
1
3/8
" Liquid Line Velocity = 0.37 m/s
NOTE: Liquid line determined at -20
°
C evap. and 30
°
C cond.
Discharge lines at -20
°
C evap. Other conditions do not
appreciably change result. Net refrigeration for
HFC-134a includes suction gas at 20
°
C.
At 40
°
C Condenser
At 50
°
C Condenser
6
1
/8
"
O
.D
. T
yp
e
L
C
o
p
p
e
r T
u
b
in
g
5
1
/8
"
4
1
/8
"
3
1
/8
"
2
1
/8
"
3
5
/8
"
2
5
/8
"
1
5
/8
"
1
3
/8
"
1
1
/8
"
7 /
8
"
3 /
4
"
5 /
8
"
1 /
2
"
3 /
8
"
-5
0
°
C
E
va
p
o
ra
to
r T
e
m
p
e
ra
tu
re
s
-4
0
°
C
-3
0
°
C
-2
0
°
C
-1
0
°
C
0
°
C
1
0
°
C
-4
0
°
C
C
o
n
d
e
n
se
r
-50
°
C Condenser
Liquid Lines
D
is
ch
a
rg
e
L
in
e
s
-3
0
°
C
C
o
n
d
e
n
se
r
Kilowatts of Refrigeration
Velocity In M/S