P-3. Design for highest energy efficiency
Design drive system for variable speed operation of the centrifugal pump in water supply system so that the system consumes minimum energy.
Given parameters:
- Rated flow 50 l/s, head 200 m, pump efficiency 81%
- Speed range 0 - 1450 rpm
- Grid voltage – 400 V
- Clean electric room for FC with abundant heat removal capabilities
- Distance from the electric room to the pump - 30 m
- Conditions at the place of the pump installation - wet
- Pump's mechanical configuration – horizontal
Load profile is given (table below). What is system efficiency at each load? How much energy consumed per day/year?
| Time, % | 10 | 30 | 30 | 30 |
|---|---|---|---|---|
| Load, % | 25 | 50 | 75 | 100 |