Patent ID: 8021519

Claim:
A water distillation system comprising: a feed water arrangement arranged to supply feed water from a feed water source; at least one flashing stage in fluid connection with said feed water arrangement to receive said feed water, said at least one flashing stage having i) a water flash evaporator arranged to vaporize at least a part of the feed water fed therein, and ii) a condenser arranged to receive vapor formed from the feed water in the evaporator and to convert at least a part of the vapor into water; a heat storage arrangement having a chargeable heat storage medium arranged to store heat energy derived from at least one external energy source and to release the stored heat energy for heating a fluid heat transfer medium flowing therethrough in a closed flow path; and a heat exchange arrangement having i) a primary heat exchanger provided with a first heat transfer section forming a part of the closed flow path of the fluid heat transfer medium, and ii) another heat transfer section arranged to receive a stream of vapor from said at least one flashing stage to flow therethrough, while in said another heat transfer section heat from the fluid heat transfer medium is at least partly transferred to the stream of vapor, wherein the stream of vapor leaving said another heat transfer section is at a raised temperature and is arranged to flow to said condenser to be at least partly converted by condensation into water and to transfer at least some of its heat to the evaporator, and the heat storage arrangement further comprises at least one vessel containing said heat storage medium and said heat storage medium is selected from the group consisting of graphite, lithium salt, and vanadium.