Energy efficiency and renewable energy sources have drawn a greater attention by EU, in particular for climate change policies as it can substantially cut down CO2 emissions to meet EU environmental obligations. It is well established that in drinking pipe systems Pressure Reducing Valves (PRV) are used as a mean for excess energy dissipation for the purpose of pressure control. This type of solution can be adopted, as a mitigation method to control the system losses, in particular, the available overload, which must have to be dissipated to avoid leakage or rupture occurrence in the pipe system. The use of micro-hydro systems seems to provide a better approach as a sustainable solution in terms of controlling the system pressure as well as to provide a non-negligible income by producing clean energy. Computational simulations, experimental research and engineering project development are carried out to analyse and compare the hydraulic system behaviour between a PRV and a pump working as a turbine (PT). This research creates an important challenge for seasonal stabilization of the energy supply by using water supply systems, due to the stochastic nature of river-hydro resources.
Keywords: energy efficiency, pressure reducing valves, pump as turbine, renewable energy sources, water supply systems