STOKVIS ENERGY SYSTEMS ECONOFLAME R6000, Manual

Page: 17 / 46

Hydraulic connection
Split System
17
Split System
The split system boiler enables the
connection of two returns with different
water temperatures. By evasing the low
loss header the cold return water enters
the condensor of the boiler directly,
without mixing with the high temepra-
ture return water (f.e. from an air heater
circuit). This hydraulic separation in-
creases the efficiency of the system.
The primary boiler pump, controlled by
the boiler managemant unit, ensures a
minimum water flow through the boiler
except for the bottom heat exchanger
(condensor). The system pump of the
low temperature circuit must be dimen-
sioned in such a way, that it can over-
come the boiler resistance.
The nominal flow rate in the (warm)
boiler circuit must be minimum 50%
of the total nominal flow rate through
the boiler.
The following data can be used for the dimensioning of the pumps in a split system.
Min. and max. flow rate Q1-Q2
Q
2,min
Q
2,max
(Q
1
+Q
2
)
min
(Q
1
+Q
2
)
max
[m
3
/h] [m
3
/h] [m
3
/h] [m
3
/h]
6142
0
3.0 4.9 8.1
6190
4.0 6.5 10.8
6237
5.1 8.2 13.6
6285
6.1 9.8 16.3
6380
8.1 13.0 21.7
6475
10.2 16.3 27.2
6539
11.5 18.5 30.8
0.10
1.00
10.00
100.00
1.00 10.00 100.00
Q1+Q2 [m3/h]
R1
[
kP
a]
R6
142
-
R6237
R6
380
-
R6539
0.00
0.01
0.10
1.00
10.00
100.00
0.10 1.00 10.00 100.00
Q2 [m3/h]
R2
[
kP
a]
R6
142
-R6
237
R6
380
-R6
539
R1
R2
Q1
Q2 P2
P1
Q1+Q2
Necessary head pump P2: R
P2
= R2
at Q2
+ R1
at (Q1+Q2)
+ R
System
Necessary head pump P1: R1
at (Q1+Q2)