Parallel connection of branches no.1, 2, 3, 4
Total pressure decrease
Δp
b
hPa
Total flow rate
With choker valve
1)
ΣQ
ch
l/min
Without choker valve
2)
Approximation
Q
chn
l/min
/
/
/
/
ΣQ
ch
l/min
/
Series connection of branches no. ………………
Total pressure decrease
ΣΔp
Bn
hPa
Total flow rate
ΣQ
chnmax
l/min
Pressure decrease in overall system
Cooling system branches
Δp
B
or
Σp
Bn
hPa
Coolant line
Length l
0
m
Added length
l
add0
m
Diameter d
0
mm
ΣQ
ch
l/min
Δp
L
/Δl at ΣQ
ch
hPa/m
Δp
L
hPa
Heat exchanger
Δp
He
hPa
Fittings
Δp
Ftg
hPa
Additional component
Δp
Add
hPa
+ /
Overall cooling system
Δp
Cs
hPa
Working point of coolant pump
Required delivery height
ΔH
m
Required delivery rate
Q
P
l/min
1)
The required coolant flow Q
chn
is set with the choker valve in
the cooling system branch.
2)
The coolant flow Q
chn
is set according to the pressure decrease
over the cooling system branches Δp
b
.
Tab. 11-15:
Sizing the coolant pump
Since the pressure decrease of the overall cooling system falls below the per‐
mitted input pressure, the coolant pump has been sized.
Tank
DOK-INDRV*-HXX05******-PR02-EN-P
Bosch Rexroth AG
397/407
Rexroth IndraDrive ML Drive Systems with HMU05
Appendix
