Page - 166 - in Clean Water Using Solar and Wind - Outside the Power Grid

166 Clean Water Using Solar and Wind: Outside the Power Grid adu-res.org/pdf/ITC.pdf). The village has about 300 inhabitants, 50-plus families, who live off agriculture and cattle raising. The nearest drinking well is located 60 km away. The solution to the water supply challenge was a reverse osmosis (RO) plant supplied by a solar PV system. The project was financed internationally, and technical support provided by the Canary Island Institute of Technology, which had experience of supplying drinking water through stand-alone systems. The village’s daily water consumption during the summer is about 15 m3, the solar irradiation annual average 5,600 kWh/m2 (compare Table 8.1) and the annual average temperature 26°C, varying from 0 to 45°C. The raw water is pumped from an artesian brackish (around 3,500 ppm) water well located inside the oasis, some 2 km from the village. The water is desalinated in an RO unit. The water is used for irrigation of palms and crops and for tourist services. The electric energy is used for the feedwater pump from the artesian well and for the compressor in the RO unit. Some of the system parameters are: PV generator Peak power 10 kWp; operation time = eight hours/day Feed pump Max power = 1 kW; pumps water from the well through a 2 km pipe; flow rate = 3 m3/hour; pressure = 3 bar High-pressure pump for the RO unit Requires 3 kW for pressure <15 bar; flow rate = 3 m3/hour Disinfection 200 W Lighting 250 W Battery storage capacity = 600 Ah; C10 batteries (→ discharge current will discharge the battery in ten hours) Produced water Production = 15 m3/day; salinity <500 ppm Specific power 2 kWh/m3 of produced water Downloaded from https://iwaponline.com/ebooks/book-pdf/520710/wio9781780409443.pdf by IWA Publishing user