A refrigeration unit with dynamic air cooling, consisting of a centrifugal compressor (1) with an electric drive (2), whose outlet is connected to a working element (5), whose outlet is connected to the inlet of a turbine (7) with a radial axis, connected to an electrical energy generator (6), where the outlet of the turbine (7) is directed towards a wall-pipe heat exchanger (8) further connected to a pump (9) of the process fluid, characterised in that, in an arrangement between the centrifugal compressor (1) and the working element (5) there is a pipe-wall exchanger (3) of the air-air type, to which a fan (4) is connected. The working element (5) of the unit has a cylindrical hollow profile comprising helical recesses (5.1) with a substantially oval shape.
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