Energy analysis of a small-scale multi-effect distillation system powered by photovoltaic and thermal collectors

Powering thermal desalination technologies by renewable energy is believed to be a viable solution overcome the worldwide freshwater scarcity problem without causing more damage environment. In this paper, multi-effect distillation system (MED) with mechanical vapor compression powered generated electrical power of photovoltaic/thermal collectors and assisted by-product generated. The sized according needed designed for small-scale application weather conditions Alexandria, Egypt. Excess electricity injected into grid hot water storage tank used as back-up compensate low fluctuating radiation. Results show that, at saturation temperature MED’s heating steam 55 °C, production 11.1 m3/day in 10 hours operation, specific consumption 9.72 kWh/m3, area 317.04 m2s/kg, performance ratios unit 3.33 6.97 overall system. However, T = 65 °C system’s totally absorbed compressor, decreases.