Abstract: This device for cooling regions with limited thermal exchange surface, in particular for electronic components, comprises a body made of thermally conducting material which internally defines a duct for the passage of a refrigerating fluid and has a portion of its surface associable with a region to be refrigerated; the passage duct has, for at least a portion of its extension, a circular cross section, and at this portion there is an injection nozzle which is fed with pressurized refrigerating fluid so as to cause expansion of the refrigerating fluid in the passage duct.

Abstract: This pump for refrigerating systems, in particular for aeronautical applications, comprises a pump body accommodating an impeller rotatable about a main axis; the impeller is substantially disk-shaped and has, on at least one of its faces, a plurality of radial blades arranged along a circular crown which is concentric to the main axis. The radial blades are accommodated in an annular duct which extends in the pump body concentrically to the main axis and is axially delimited, on one side, by the blade bearing face of the impeller; the annular duct has an intake port and a delivery port which are angularly spaced with respect to the main axis for the inflow and outflow of a fluid and is closed in an axial direction at least in the region not affected by the ports, so that when the impeller rotates the fluid advances along the annular duct from the intake port to the delivery port forming vortices about the circumference defined by the annular duct.

Abstract: This high-efficiency turbine, in particular for the exploitation of wind power for auxiliary power sources in aeronautical applications, comprises a central body which is rotatable about the axis of the turbine and supports at least two vanes which extend radially with respect to the axis of the turbine and are rotatable together with the central body about the turbine axis. The vanes of the turbine are pivoted to the central body to vary the front area of the turbine affected by the rotation of the vanes.