PUMPS AS TURBINES AND INDUCTION-MOTORS AS GENERATORS FOR ENERGY RECOVERY IN WATER-SUPPLY SYSTEMS

Pressure-reducing valves, which dissipate energy, are often used in wa ter supply systems to regulate the down-stream pressure levels. If a r everse running pumpset is installed alongside such a valve, most of th e dissipated energy can be recovered. This paper describes a system of this type which has recently been installed by North West Water, with advice and specialized equipment supplied by the Nottingham Trent Uni versity Micro-Hydro Group. The power produced by the energy-recovery s ystem is used to run and monitor a remote potable-water dosing plant.