Lenze DSD - Manual (Page 173)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
173
7 Applications
7.18 Pump
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7.18 Pump
Pumps have the task to move a medium with a specific density against a stationary pressure. The
power (P) that has to be applied hydraulically for this purpose can be calculated by means of the
flow rate (Q).
• The required data (efficiency, rated speed) of the pump can be gathered from the pump manu-
facturer's data sheet.
7.18.1 Calculations
For a pump according to the drawing the following applies:
[7-166] Equation 1: Power of the medium
• The factor 3600 results from the adaptation of the units.
Power of the pump
Via the efficiency of the pump the required power of the pump is calculated:
[7-167] Equation 2: Power of the pump
P
ρ g Q h
opr
⋅ ⋅ ⋅
3600
----------------------------------- =
P
Pmp
P
η
Pmp
------------- =