Unit recovering atmospheric moisture from vapor or mist state employs hygroscopic salts for absorption, in combination with solar still for release

摘要

Reversible absorption properties of compounds for liquid- or vapor phase water are exploited. Lithium bromide, lithium chloride, calcium bromide and calcium chloride are examples of suitable compounds absorbing water from the vapor- or liquid state. A solar still releases the water absorbed. Preferred Features: The solar still comprises an oven (3) with a fabric band (1) recirculating continuously or intermittently between its interior and the ambient air. The band is impregnated with an absorbent chemical composition, e.g. one listed above. Absorption is continuous, and takes place simultaneously with water production. Operation alternatively follows the diurnal cycle, with absorption at night and water production during the day. The unit is orientated to face the sun, following its relative motion by manual or automatic means. An equatorial mounting is used. Fabric advance is manually- or automatically controlled, as a function of the oven temperature. The solar still has a condenser cooled by ambient air. It is alternatively cooled by water, seawater, brackish water or polluted water.