Abstract: A tubular coiled heat exchanger adapted for cooling or heating of various fluids in various fields of industry. The heat exchanger comprises a shell and a core around which tubes having essentially the same length are wound at least in two layers. The tubes may have grooves projecting into the tubes to intensify heat abstraction within the tubes. A member of a streamlined cross-section, such as, a wire, adapted for forming fins is wound around the tubes with a pitch of at least twice the diameter of the wire. The tubes are wound around the core so that the tops of the fins of each tube coil come alternately in contact with those of the fins and with tube surfaces of adjacent coils. The above embodiment of the heat exchanger makes it possible to vary the number of turns of the tubes when winding the tubes being set once without any distance pieces between the layers. This ensures the manufacture of a highly compact heat exchanger featuring high thermal and hydrodynamic properties.

Abstract: A machine, comprising a portal-type bed, two slide rests located on circular guides rotatably mounted about shafts fastened to the bed, rolling heads mounted each in a corresponding slide rest so that they are capable of shifting with respect to the slide rest, rolling rolls set up in each head, a slide rest turning gear and a gear for displacing the rolling heads relative to the slide rests, a carriage with a gear for clamping an article being rolled, with said carriage being mounted movably on the bed to introduce the article into the rolling zone and to withdraw it therefrom, a carriage transfer gear linked mechanically to the slide rest turning gear, and drives of the above-mentioned gears.