Large-scale time evaluation for energy estimation of stand-alone hybrid photovoltaic–wind system feeding a reverse osmosis desalination unit

In this study, energy and water production estimation on a large-scale time from Photovoltaic–Wind hybrid system coupled to a reverse osmosis desalination unit in southern Tunisia has been elaborated. The use of a hybrid system for desalination appears nowadays as a very promising solution for remote and arid areas. The produced energy is used for potable water production. For energy production, metrological data (wind speed, solar irradiance…) and steady-state models have been used. The obtained results show that the hybrid solution (solar and wind) gives an energy availability during the year, despite changing energy according to daytime, season and year. The reverse osmosis desalination unit powered by Photovoltaic–Wind hybrid system for producing potable water from brackish water is an appropriate solution to southern Tunisia (salinity about 6 g/l). For this, compositions of brackish feed water in Djerba region were selected. Double stage configuration in the desalination process using spiral modules is adopted extensively and validation of the steady-state models is presented.

► In this study we estimate the large-scale time production of energy and water from photovoltaic–wind system powered desalination unit. ► We design the architecture of hybrid system according to the project site and according to the solar and wind potentials. ► We present the design of a reverse osmosis desalination unit and its sizing according to the water quality. ► Produced energy is consumed for fresh water production since the output power of hybrid system is changing with weather conditions. ► Finally, we present a validation of the steady-state models of the hybrid system powered desalination unit.