Patent FR-2953510-A1 (FR)
Title: Brackish water purifier with solar distillation comprises an enclosure divided into an evaporator zone and a condenser zone located behind the evaporator zone with respect to a transparent front face of the enclosure
Inventor: BEAUQUIS NICOLAS
IPC: C02F1/14
Filed: 2009-12-04
Abstract: The brackish water purifier with solar distillation comprises an enclosure (2) divided into an evaporator zone (6) and a condenser zone (8) located behind the evaporator zone with respect to a transparent front face (4) of the enclosure. The evaporator zone contacts with the condenser zone by a first passage for air of contact, where the air flows by thermosiphon of the evaporator zone towards the condenser zone. A heat exchanger traversed by brackish water to be treated is located in the condenser zone. The brackish water is sprayed on top of the evaporator zone. The brackish water purifier with solar distillation comprises an enclosure (2) divided into an evaporator zone (6) and a condenser zone (8) located behind the evaporator zone with respect to a transparent front face (4) of the enclosure. The evaporator zone contacts with the condenser zone by a first passage for air of contact, where the air flows by thermosiphon of the evaporator zone towards the condenser zone. A heat exchanger traversed by brackish water to be treated is located in the condenser zone. The brackish water is sprayed on top of the evaporator zone. The evaporator zone and the condenser zone are heat insulated from each other by two plates (12, 14) made of a corrosion resistant material spaced from one another, and an insulating material provided at the space between the two plates. The brackish water is sprayed at the top of the evaporator zone by a rigid ramp made of a corrosion and electrochemical resistant material. The heat exchanger is constituted by two plates assembled with one another. A hydraulic circuit is formed in both plates for allowing brackish water circulation against the current or concurrent flow of air circulating in the condenser zone. The exchanger has infinitesimal thickness to reduce the weight of the enclosure and enhance the condensation of water vapor. The enclosure is heat insulated on each of its walls except its transparent front face. An air accelerator is present to allow the air to flow from the evaporator zone towards the condenser zone. The air accelerator is constituted of a curved wall that maintains a laminar airflow in the first passage of air of contact. The radius of curvature of the curved wall is decreased for reducing the section of the air passage and consequently to increase the velocity of the same air. A needle valve is provided in the enclosure to regulate the flow of injection water. The evaporator zone comprises a face coated with a dark coating of absorbent material to simultaneously absorb a large amount of water and to capture maximum energy from the sun. A recovery of condensed water is carried out by an inclined plane laid on the exchanger of the condenser zone. The purifier further comprises 47 curved collector of condensed water located on the upper wall of the condenser zone, and a collection of untreated water constituted by an inclined plane located in lower part of the evaporation zone and directing to the outlet of untreated water located on the enclosure. The evaporator area comprises a passage opening for an air inlet, and the condenser area comprises a passage opening for an air outlet. The evaporator zone contacts with the condenser area by a second passage for air contact located opposite to the first passage of air contact. The second passage of contact is equipped with an air accelerator allowing air to flow from the condenser zone to evaporator zone. The air accelerator is constituted of a curved wall, which maintains a laminar air flow in the second passage for contact of air.