Abstract: A heat exchanger having multiple tubes through which a first medium to be cooled can flow. At least one section of the tubes is respectively surrounded by a space or respectively one section of multiple of the tubes is arranged together in a space. A heat-absorbing second medium can flow through the space or the spaces, and wherein the tubes have a constant outer diameter at least in the section. The tubes each have, at least in at least one sub-area of the respective section, an inner diameter tapering in the direction of flow of the first medium.

Abstract: A method to produce olefins may include supplying a hydrocarbon feed to an outer tube of a thermal energy recovery assembly; heating the hydrocarbon feed in the outer tube of the thermal energy recovery assembly to output a preheated hydrocarbon feed; supplying the preheated hydrocarbon feed to an electrically powered cracking furnace comprising a reaction zone to heat the preheated hydrocarbon feed; cracking the preheated hydrocarbon feed in the reaction zone of the electrically heated cracking furnace using heat generated by electricity to output hot reactor effluent comprising cracked hydrocarbons and olefins; supplying the hot reactor effluent to an inner tube of the thermal energy recovery assembly; and cooling the hot reactor effluent in the inner tube of the thermal energy recovery assembly by transferring heat to the hydrocarbon feed.

Abstract: A heat exchanger having a first section, through which a first medium can flow, and a second section, through which a second medium can flow. During operation a heat exchange takes place between the first and the second medium. The first section has an inlet chamber and first tubes connected to the inlet chamber, and an outlet chamber and second tubes connected to the outlet chamber. The first tubes are each closed at the ends facing away from the inlet chamber and each second tube is at least partly arranged inside one of the first tubes, and the end of the second tube that faces away from the outlet chamber is open to the interior of the respective first tube. The second section has an inlet means and an outlet means.

Abstract: A heat exchanger having a first section, through which a first medium can flow, and a second section, through which a second medium can flow. During operation a heat exchange takes place between the first and the second medium. The first section has an inlet chamber and first tubes connected to the inlet chamber, and an outlet chamber and second tubes connected to the outlet chamber. The first tubes are each closed at the ends facing away from the inlet chamber and each second tube is at least partly arranged inside one of the first tubes, and the end of the second tube that faces away from the outlet chamber is open to the interior of the respective first tube. The second section has an inlet means and an outlet means.