Device for Separating Product Water From Impure Raw Water

A method for separating product water which is obtained by condensation from raw water which is composed of a mixture of water and impurities, the method comprising:

• delivering a process gas through a gas process circuit including an evaporator for the raw water and a condenser for the product water connected in series;
• delivering the raw water to the evaporator by way of an infeed;
• retrieving a concentrate which as compared to the raw water has a higher concentration of impurities to be separated from an outfeed of the evaporator;
• retrieving product water from the condenser from an outlet;
• wherein the condenser and a first heat exchanger for cooling the product water are connected in series within a product water process circuit;
• and
• carrying out direct condensation in the condenser, wherein the product water is fed from an inlet into a top of the condenser, and exits from an outlet in a bottom of the condenser, and the process gas flows from the bottom of the condenser to the top of the condenser.