The present invention concerns a heat-exchange element (31, 131) for a heat exchanger (1) enabling heat exchange between a first fluid and a second fluid, said heat-exchange element (31, 131) being designed to guide said first fluid through the inside of said heat-exchange element (31, 131) and said second fluid around the outside of said heat-exchange element, said heat-exchange element (31, 131) including at least one first duct (42, 43, 44, 45; 141, 142, 143) having a first essentially cylindrical wall and a second duct (42, 43, 44, 45; 141, 142, 143) having a second essentially cylindrical wall, the at least first and second ducts (42, 43, 44, 45; 141, 142, 143) being connected to one another by a portion of the first wall adjacent to a portion of the second wall.

The present invention concerns a heat-exchange element (31, 131) for a heat exchanger (1) enabling heat exchange between a first fluid and a second fluid, said heat-exchange element (31, 131) being designed to guide said first fluid through the inside of said heat-exchange element (31, 131) and said second fluid around the outside of said heat-exchange element, said heat-exchange element (31, 131) including at least one first duct (42, 43, 44, 45; 141, 142, 143) having a first essentially cylindrical wall and a second duct (42, 43, 44, 45; 141, 142, 143) having a second essentially cylindrical wall, the at least first and second ducts (42, 43, 44, 45; 141, 142, 143) being connected to one another by a portion of the first wall adjacent to a portion of the second wall.

A flow reactor is structured to increase the overall heat transfer coefficient, which represents the efficiency of heat exchange with respect to a reactive fluid to be treated. This flow reactor is provided with three flow passages, which are a first flow passage, a second flow passage, and a third flow passage which spirally circulate within a space formed between an inner tube and an outer tube. The flow passages are compartmented by an inner heat transfer body and an outer heat transfer bodies. The heat transfer bodies spirally circulate, have a screw-like cross-sectional shape in an axial cross-sectional view, and are assembled in a screw-like configuration. By changing the shapes of a male-thread portion and a female-thread portion, the flow passage area of the first flow passage is changed, the second flow passage and the third flow passage are spirally formed, and heat exchange and reaction take place through the heat transfer bodies.

The monolithic redundant loop cold plate core includes a core structure and a first cooling loop formed in the core structure. The first cooling loop including: a plurality of first cooling loop passageways extending across a heat exchanger core in one or more passes. The one or more passes include at least a first pass. The monolithic redundant loop cold plate core includes a second cooling loop formed in the core structure. The second cooling loop includes: a plurality of second cooling loop passageways extending across the heat exchanger core in the one or more passes. The plurality of first cooling loop passageways are intermixed in an alternating side-by-side arrangement with the plurality of second cooling loop passageways in a single cooling plane. The monolithic redundant loop cold plate core is a single piece including a unitary structure.

The monolithic redundant loop cold plate core includes a core structure and a first cooling loop formed in the core structure. The first cooling loop including: a plurality of first cooling loop passageways extending across a heat exchanger core in one or more passes. The one or more passes include at least a first pass. The monolithic redundant loop cold plate core includes a second cooling loop formed in the core structure. The second cooling loop includes: a plurality of second cooling loop passageways extending across the heat exchanger core in the one or more passes. The plurality of first cooling loop passageways are intermixed in an alternating side-by-side arrangement with the plurality of second cooling loop passageways in a single cooling plane. The monolithic redundant loop cold plate core is a single piece including a unitary structure.

A process for the continuous production of thin-walled, radially closed hollow profiles which are composed of nonferrous metals and have a small cross section comprises supply of a flat strip of the nonferrous metal to a forming apparatus (212) at a first supply speed, where the thickness of the strip corresponds to the wall thickness of the hollow profile. The forming apparatus (212) is configured for continuous forming of the flat strip supplied into a shape corresponding to the hollow profile. After forming, two opposite edges of the flat strip rest flush against one another in a contact region. A welding apparatus (216) continuously welds the edges which rest flush against one another by means of a laser which emits light having a wavelength of less than 600 nm. The laser heats a point in a welding region which has a diameter which is less than 20% of the cross-sectional dimension of the hollow profile. The welded hollow profile is taken off from the welding region, provided in a corrugator (225) with parallel or helical corrugation in sections and taken up in an uptake device (226).

A process for the continuous production of thin-walled, radially closed hollow profiles which are composed of nonferrous metals and have a small cross section comprises supply of a flat strip of the nonferrous metal to a forming apparatus (212) at a first supply speed, where the thickness of the strip corresponds to the wall thickness of the hollow profile. The forming apparatus (212) is configured for continuous forming of the flat strip supplied into a shape corresponding to the hollow profile. After forming, two opposite edges of the flat strip rest flush against one another in a contact region. A welding apparatus (216) continuously welds the edges which rest flush against one another by means of a laser which emits light having a wavelength of less than 600 nm. The laser heats a point in a welding region which has a diameter which is less than 20% of the cross-sectional dimension of the hollow profile. The welded hollow profile is taken off from the welding region, provided in a corrugator (225) with parallel or helical corrugation in sections and taken up in an uptake device (226).

A tube for a steam cracking furnace comprising: at least one downstream tubular segment of circular section having a main diameter; at least one twisted tubular segment having a length less than a quarter of the length of the tube, and comprising: a central part with an elliptical or lobed section, having a helical pitch between one times and ten times the main diameter, and an aspect ratio of the elliptical or lobed section between 0.5 and 0.8; an upstream transition part establishing a geometric transition between the central part and a tubular segment of circular section; a downstream transition part establishing a geometric transition between the central part and the downstream tubular segment, with a fluid being intended to flow from the upstream transition part to the downstream transition part.

A heat exchange apparatus, and more particularly a condenser device, is provided. The condenser includes a housing with tubes that have grooves on the outer surface thereof, baffles, and inlet and outlet manifolds for tube-side and shell-side heat transfer fluids. An outside of each of the tubes is coated with a material having a low wetting coefficient. The baffles of the condenser are formed so, and the that the distance between the baffles decreases from the shell-side heat transfer fluid inlet manifold to the shell-side heat transfer fluid outlet manifold. The inner surfaces of the tubes have protuberances thereon and are coated with a material having a high adhesion resistance coefficient.

A heat exchange apparatus, and more particularly a condenser device, is provided. The condenser includes a housing with tubes that have grooves on the outer surface thereof, baffles, and inlet and outlet manifolds for tube-side and shell-side heat transfer fluids. An outside of each of the tubes is coated with a material having a low wetting coefficient. The baffles of the condenser are formed so, and the that the distance between the baffles decreases from the shell-side heat transfer fluid inlet manifold to the shell-side heat transfer fluid outlet manifold. The inner surfaces of the tubes have protuberances thereon and are coated with a material having a high adhesion resistance coefficient.