Principle: It is a technique to desalinate water using solar energy by direct and indirect method. Indirect solar desalination employs two separate systems; a solar collection array, consisting of photovoltaic and/or fluid based thermal collectors, and a separate conventional desalination plant. In the direct method, a solar collector is coupled with a distilling mechanism and the process is carried out in one simple cycle.
Operation: In the direct method, a solar collector is coupled with a distilling mechanism and the process is carried out in one simple cycle. Solar stills of this type are described in survival guides, provided in marine survival kits, and employed in many small desalination and distillation plants. Water production by direct method solar distillation is proportional to the area of the solar surface and incidence angle and has an average estimated value of 3-4L/m2/day. Because of this proportionality and the relatively high cost of property and material for construction direct method distillation tends to favor plants with production capacities less than 200m3/day.
Application: By treating saline water and turning it into plain water we can save a lot of ground water from being misused.