TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Component: The feedstock fluid is water. The assembly further includes a control mechanism for regulating the speed of circulating mechanism, supply mechanism for conveying feedstock fluid from an external source to floor mechanism, removal mechanism for drawing the feedstock fluid from floor mechanism and conveying it out of the enclosure, separate removal mechanism for conveying fluid condensate out of the upper condenser air duct, spraying mechanism for spraying feedstock fluid into the air of the lower evaporator air duct, air vent mechanism to allow outside air to access the enclosure at a location near the air intake of circulating mechanism to permit enclosure to inflate when the circulating mechanism is operating, forcing mechanism to force air through the air vent mechanism into the enclosure, heat exchange pipe mechanism (35) that lies and extends along the length of the floor mechanism for transferring heat to the layer of feedstock fluid, first heat exchanger mechanism for condensing a working fluid, second heat exchanger mechanism for evaporating working fluid, mechanism for positioning assemblies adjacent to one another so that they share in common the same floor mechanism, and pumping mechanism for pumping feedstock fluid from the lower elevation end to the higher elevation end of the lower evaporator air duct and for applying the fluid to the surface of a fluid-absorbing solar energy absorbing wick layer covering the floor of the lower evaporator air duct. The control mechanism includes at least2 temperature sensors for sensing the temperature differential along the length of the air ducts, light-sensing mechanism for sensing the ambient level of incident solar radiation, or clock mechanism for determining the time of day. The floor mechanism is overlain through solar-energy-absorbing wick mechanism for assisting the humidification of air in lower evaporator air duct. The light-transmitting roof mechanism comprises at least2 elongated light-transmitting layers attached to one another at their periphery. The layers are spaced apart from the other using insulating air layer. The insulating air layers are provided with inflation mechanism to admit outside the air. The light-transmitting air partition mechanism comprises elongated light-transmitting film mechanism. The upper surface of the air partition mechanism is hydrophobic. The lower surfaces of the roof mechanism and air partition mechanism are hydrophilic. The pressure differential induced in the working fluid between heat exchangers is used to drive a turbine or heat engine mechanism for performing useful work. The assembly is inclined.