10
IVEDITI 0121 4880985_00
Water flow rate [l/h-gpm]
Water flow rate [l/h-gpm]
Water flow rate l/h-gpm]
Coil pr
essur
e dr
op
s [kP
a-
ftH2O]
Coil pr
essur
e dr
op
s [kP
a-
ftH2O]
Coil pr
essur
e dr
op
s [kP
a-
ftH2O]
The pressure drops in the previous diagram relate to an average water temperature of 50 °F (10 °C).
The table below states the correction to apply to the pressure drops on variation of the average water temperature.
Water medium temperature
°C
5
10
15
20
50
60
70
°F
41
50
59
68
122
140
158
Multiplicative coefficients
1.03
1
0.96
0.91
0.78
0.75
0.72
PRESSURE DROPS COOLING ONLY
2-PIPE SYSTEM PRESSURE DROPS HEATING ONLY
4-PIPE SYSTEM PRESSURE DROPS HEATING ONLY
0
20
40
60
80
100
120
140
0
68
136
205
273
341
409
478
0
200
400
600
800
1000
1200
1400
1600
1800
0
0,881
1,761
2,642
3,522
4,403
5,283
6,164
7,045
7,925
VED 030I
VED 040I
VED 130I
VED 140I
VED 230I
VED 240I
VED 330I
VED 340I
0
10
20
30
40
50
60
70
80
90
0
100
200
300
400
500
600
700
VED 030I
VED 130I
VED 230I
0
0,440
0,881
1,321
1,761
2,201
2,642
3,082
0
34
68
102
136
171
205
239
273
307
0
20
40
60
80
100
120
0
200
400
600
800
1000
1200
1400
1600
1800
VED 030I
VED 040I
VED 130I
VED 140I
VED 230I
VED 240I
VED 330I
VED 340I
0
0
0,881
1,761
2,642
3,522 4,403
5,283
6,164 7,045
7,925
68
136
205
273
341
409
The pressure drops in the previous diagram relate to an average water temperature of 50 °F (10 °C).
The table below states the correction to apply to the pressure drops on variation of the average water temperature.
Water medium temperature
°C
41
50
59
68
122
140
158
°F
105
122
138
154
251
284
316
Water medium temperature
1.03
1
0.96
0.91
0.78
0.75
0.72
