Abstract: The tracking apparatus (2) comprises a frame (4) mounted on a rigid stand that is orientated such that the longitudinal axis (6) of the frame is at an angle above horizontal. The frame (4) comprises opposite frame members (8 and 10) between which is mounted reservoirs in the form of hollow side tanks (12 and 14). Each of the tanks is partially filled with a liquid refrigerant. The interior of the tank (12) is connected to flexible bellows (16) through the passageway of a conduit (18). The interior of the tank (14) is connected to flexible bellows (20) through the passageway of a further conduit (22). An actuating mechanism (24) is secured to frame member (10) of the frame. The actuating mechanism comprises a further frame (26) to which the outer ends of bellows (16 and 20) are fastened. The inner ends of the bellows are connected by a rigid shaft (28) which is driven back and forth by the bellows (16 and 20) to effect rotation of drive wheel (30) of the actuating mechanism.

Abstract: The atmospheric water harvester (2) shown in FIG. (1) comprises a centrally located flue in the form of a tower 4 and a surrounding heating enclosure (6) for collecting incident solar energy to heat air which enters its periphery (8). With heating of the air in the heating enclosure (6), an updraught is created within tower (4) as the air from the heating enclosure (6) returns to the atmosphere from the open end of the tower A base structure (10) housing a plurality of wind turbines is provided around the base of the tower. As the heated air flows from the heating enclosure (6) into the tower it is harnessed to rotate the wind turbines. Each wind turbine (20) is provided with associated water collection apparatus (94) comprising a refrigeration system for cooling condensation surfaces to, or below, the dew point of the air to effect the condensation of water from the air onto condensation surfaces of the water collection apparatus for collection.