[Claim 1] A refrigeration unit with dynamic air cooling, comprising a centrifugal compressor (1) with an electric drive (2), a working element (5) providing dynamic air cooling, a turbine (7) with a radial axis, an electrical energy generator (6), a wall-pipe heat exchanger (8), a pump (9) of the process fluid, characterised in that it further comprises a pipe -wall exchanger (3) of the air-air type with a fan (4) connected thereto, the outlet of centrifugal compressor (1) is connected to a pipe- wall exchanger (3), the outlet of the pipe-wall exchanger (3) is connected to a working element (5), whose outlet is connected to the inlet of the turbine (7) with a radial axis, connected to the electrical energy generator (6), the outlet of the turbine (7) is directed towards the wall- pipe heat exchanger (8) further connected to a the pump (9) of the process fluid, said working element (5) having a cylindrical hollow profile comprising helical recesses (5.1) with a substantially oval shape and configured to provide air cooling by conversion of inner thermal energy of an air flow into kinetic energy.

[Claim 2] The unit according to claim 1, characterised in that it further comprises an inverter (10) being connected to the generator (6) of the turbine (7), configured to provide frequency conversion and synchronisation of the mains power supply.

[Claim 3] The unit according to claim 2, characterised in that the inverter (10) is connected to the electric drive (2) of the centrifugal compressor (1). [Claim 4] A working element for a refrigeration unit comprising centrifugal air compressor, characterised in that the working element (5) has a circular inlet (5.1); behind the inlet, there is a cylindrical segment (5.2) with a length substantially shorter than the diameter of the clearance of its opening; behind the segment (5.2), there is a protuberance (5.3), whose walls are convex towards the outside and they have a semi-circular shape, the diameter of the protuberance (5.3) being larger than the diameter of the cylindrical segment (5.2); behind the protuberance (5.3), there is a substantially longest segment (5.4) shaped in such a manner that its internal walls have peripheral recesses (5.5) with shapes resembling oval, which extend helically along its lengthwise cross- section, the cross-section of the recesses (5.5) not being uniform along this part of the working element (5) and the size of this cross-section in creasing and decreasing in a fluid manner; behind the segment (5.4), there is an outlet (5.6) with obliquely shaped walls, where a larger diameter is placed at the end of the working element (5); the recesses (5.5) become reduced to the area of the outlet (5.6), thereby in the working element (5) the internal thermal energy of the air is converted into kinetic energy of the flowing air, which results in an increase in its velocity and a decrease in its temperature.