An article describes prototype of multi-layer solar air-conditioner of small refrigerating capacity. In a compact device installed in a hipped roof end or in a wall of building, a ejector refrigerating cycle is supplied with a steam generated in a flat solar collector. Compiling the equations describing the phenomena occur in a steam ejector and the heat exchangers a physical model of the device was proposed. Numerical version of that model was used to create the characteristics of cooperating devices. The obtained characteristics allowed to determine an optimum point of device work. Finally the general guidelines for design engineers were formulated.
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