EURO 27 Abstract Submission

Energy efficiency in water supply systems : variable speed drives vs pumping scheduling

Invited abstract in session TB-12: Mathematical Optimization of Water Networks, stream Long Term Planning in Energy, Environment and Climate.

Area: Energy/Environment and Climate

Tuesday, 10:30-12:00
Room: TIC Conference Room 4&5, Level 3

Authors (first author is the speaker)

1. Gratien Bonvin
CMA, Mines ParisTech
2. Sophie Demassey
CMA, Mines ParisTech


Improving the energy efficiency is one of the most cost-effective ways to counterbalance the increase of energy costs. In water supply systems, which consume 2-3% of the worldwide energy, energy efficiency is an important subject as energy represents a large amount of operating costs.

Several solutions have been proposed in order to reduce energy costs. In addition to leakages reduction through pressure modulation and network design improvement, two approaches are suggested:
- variable speed drive installation, in order to enable pumps maintaining fixed pressure under changing flow conditions,
- pumping scheduling, which allows to take advantage from dynamic pricing and to reduce pressure losses.

We estimate the potential energy saves arising from the establishment of these two solutions on a branched network containing a pumping station with 6 fixed speed pumps which supply 16 water towers. We show that installing variable speed drives can lead to a higher energy cost reduction on the short-term but pumping scheduling is a more cost-effective solution after the resizing of the pumping station.


  • Water Management
  • Programming, Quadratic

Status: accepted

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