Low temperature desalination; Steam power plant condenser; Waste heat utilization; Inverted U-pipe; Cooling sea water; Vacuum
Shortage of clean water is continually increasing at different areas in the universe due to population increase and changes in weather. Most of these areas have abundant seawater resources. Desalination is an efficient and well established way whereby these regions can be furnished with fresh water. Desalination of saline water has been practiced regularly for over 60 years . Desalination systems can be classified as phase change technologies (e.g. MSF, MED and VC) and single phase processes (e.g. RO). All these technologies are relatively energy-intensive operations; e.g. MSF, MED, VC and RO consume GNE-617 at 19.58–27.25, 14.45–21.35, 7–16 and 4–6 kWh/m3, respectively .
In  a low temperature phase-change desalination process configuration is biochemical cycle presented and experimented. Two barometric tubes are used to enable the flow of saline water from a holding tank through one tube to an evaporator situated 10 m above the tank and back through the other tube to a brine holding tank. In the evaporator the saline water is heated by a low grade heat source, where water vapor is formed. The evaporator is connected to a condenser fitted with a third barometer tube, which discharges the fresh water to a third holding tank. The three tanks are installed at ground level. Water vapor flows from the evaporator to the condenser as a result of the pressure difference. It condenses and flows down through the third barometer tube into the fresh water holding tank.