Abstract: A device for purifying liquids by distillation includes a first and a second evaporation section, and a first and a second condensation section, where each evaporation section includes a liquid inlet and a vapor outlet and each condensation section includes a vapor inlet and a liquid outlet, the first evaporation section and the second condensation section being in vapor connection through the first evaporation section outlet and the second condensation section inlet, wherein the first evaporation section is in thermal contact with the first condensation section, and the second evaporation section is in thermal contact with the second condensation section, wherein the sections in thermal contact are separated by a non-permeable polymer membrane. The device is compact and efficient in the production of a distillate product.

Abstract: An apparatus for production of steam from an aqueous liquid includes (a) a solar panel with a pliable, essentially impermeable, polymer membrane having an outer surface and an inner surface, wherein the outer surface is adapted to be directed towards the sun; a lattice structure adapted to support the inner surface of the polymer membrane; a backing, which together with the pliable polymer film, encases the lattice structure; an inlet for the aqueous liquid; an outlet for the steam produced, and (b) means for providing a vacuum connected to the outlet. The apparatus can be produced with few and relatively simple components thereby reducing the cost of the apparatus.

Abstract: A device for purifying liquids by distillation includes a first and a second evaporation section, and a first and a second condensation section, where each evaporation section includes a liquid inlet and a vapor outlet and each condensation section includes a vapor inlet and a liquid outlet, the first evaporation section and the second condensation section being in vapor connection through the first evaporation section outlet and the second condensation section inlet, wherein the first evaporation section is in thermal contact with the first condensation section, and the second evaporation section is in thermal contact with the second condensation section, wherein the sections in thermal contact are separated by a non-permeable polymer membrane. The device is compact and efficient in the production of a distillate product.