96
Chapter 5
Figure 5-5.
Refrigerant line pressure drops for HP62 (404A) refrigerant (reprinted by permission of DuPont
Fluorochemeicals).
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
200
300
400
600
800
1000
0.01
0.4
0.6
0.8
1
2
3
4
6
8
10
0.08
0.1
0.2
0.3
0.02
0.02
0.03
0.04
0.06
0.08
0.1
0.2
0.3
0.4
0.6
0.8
1
2
3
4
6
8
10
0.03
0.04
0.06
At 30°C Condenser
At 40°C Condenser
At 50°C Condenser
6
1
/8
"
O
.
D
.
T
y
p
e
L
C
o
p
p
e
r
T
u
b
i
n
g
5
1
/8
"
4
1
/8
"
3
5
/8
"
3
1
/8
"
2
5
/8
"
2
1
/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
-2
0
°C
0
°C
-3
0
°C
-1
0
°C
1
0
°C
D
isc
h
a
rg
e
L
in
e
s
L
in
e
s L
in
e
s
Pressure Drop In Kpai Per Meter
Tons of Refrigeration
EXAMPLE:
15 kW at -40°C Evap., 40°C Cond.
2
1
/8
" Suction Line Pressure Drop = 0.11kPa/m
5
/8
" Liquid Line Pressure Drop = 0.47 kPa/m
NOTE: Pressure drops do not
allow for pulsating flow.
If flow is pulsating, use
next larger pipe size.
Liquid line and discharge
lines determined at -20°C
evap. and 30°C cond.
Other conditions do not
appreciably change
result. Vapor at evap.
outlet assumed to be at 20°C.
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