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P
V
Power dissipation to be discharged in kW
ΔT
Temperature rise of coolant in K
ρ
Density of coolant in kg/l
c
Specific thermal capacity of coolant in kJ/kgK
Fig. 11-10:
Calculating the flow rate
The flow rates are indicated in the technical data of the liquid-cooled compo‐
nents (referring to a fixed temperature increase of the coolant water). For any
other temperature increase, calculate the flow rate using the above formula.
Pressure decrease
The coolant flow in a drive component is subject to changes in volume and
direction. This results in losses in the drive components due to friction and
change of direction. These losses cause the pressure decrease Δp.
The flow diagram shows how the pressure decrease Δp depends on the flow
rate Q of a specific component.
Flow diagram
Δp
Pressure decrease
Δp
Qmin
Pressure decrease for Q
min
Q
Flow rate
Q
min
Min. required flow rate (see technical data for each component)
Fig. 11-11:
Flow diagram
All other parts of the cooling system through which the coolant flows (tubes,
valves, etc.) also cause pressure decreases.
Calculating pressure decrease
The pressure decrease Δp in liquid-cooled drive components is indicated in
the technical data of each drive component. It refers to the indicated flow rate
of the coolant water. These pressure decrease values only refer to drive com‐
ponents from Rexroth. The pressure decrease caused by equipment connec‐
ted by the customer, such as screw connections, connecting bends, hose
nozzles, etc., must be added to the pressure decrease of the drive compo‐
nent.
The flow rate-based pressure decrease can be calculated with the following
formula:
Bosch Rexroth AG
DOK-INDRV*-HXX05******-PR02-EN-P
388/407
Rexroth IndraDrive ML Drive Systems with HMU05
Appendix
Содержание Rexroth HMU05.1N Series
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