11.8
Liquid cooling
11.8.1
Sizing liquid cooling
Calculation criteria
Physical data
The figure below shows the fundamental physical data of a liquid-cooled
drive component.
Q
Flow rate
ΔT = T
2
- T
1
Temperature increase
Δp = p
2
- p
1
Pressure decrease
P
v
Power dissipation to be discharged
Fig. 11-8:
Physical data
Flow rate
Flow rate
Coolant flows through liquid-cooled components. The flow rate Q indicates
how much coolant volume ΔV per time interval Δt flows through the compo‐
nent.
Q
Flow rate in l/min
ΔV
Coolant volume in l
Δt
Time interval in minutes in which ΔV flows
Fig. 11-9:
Flow rate
Calculating the required flow rate
If the power dissipation P
V
and the coolant are known, the required flow
rate Q can be calculated with a selected coolant temperature increase ΔT.
The required flow rate Q can be calculated from the physical data of the com‐
ponent being cooled.
DOK-INDRV*-HXX05******-PR02-EN-P
Bosch Rexroth AG
387/407
Rexroth IndraDrive ML Drive Systems with HMU05
Appendix