Recent fresh water augmentation techniques in solar still and HDH desalination - A review

This article reports about the recent reformation carried out in the solar still and humidification dehumidification desalination system using renewable energy sources for improving the fresh water production rate. In solar still, the impact of integration of fins, usage of energy storing materials and wick materials, mixing of nanoparticles, agitation effect, transparent cover cooling, integration of thermoelectric cooler, multi effect of solar still, preheating with water heater and photovoltaic thermal collector, refine the condensing cover, operating with heat pump and refrigeration and integration with waste heat recovery are discussed. The recent recast carried out in the packed bed humidification and bubble column desalination using solar energy and biomass energy is also reported. It is observed that the solar still water output remarkably enhances with the integration of solar collectors, nanoparticles in water and cover cooling. In HDH desalination, bubble column humidifier found to be better compared to the packed bed and other type of humidifiers. Also it is noticed that the biomass based desalination systems are more suitable for the places with lower solar radiation and places with higher biomass sources.