Abstract: A built-in packing for the material exchange and/or heat exchange between gases and liquids is composed of a plurality of undulating lattice-like elements arranged next to each other and each mounting element has channels formed by the undulations extending at an angle relative to the vertical direction and extending parallel to each other, wherein the channels of always two adjacent mounting elements intersect each other. Continuous longitudinal struts are provided at the bottom of the channels, wherein the longitudinal struts have contact plates at the ends thereof, and wherein the contact plates are components of an upper and a lower horizontal closed edge strip. The longitudinal struts are connected through transverse struts in a framework-like manner, wherein the transverse struts extend in horizontal planes which extend parallel to the two edge strips.

Abstract: A heat exchanger tube for condensing steam with the use of cooling air includes an upper steam supply and a lower condensate discharge. The heat exchanger tube has an elongated cross-section in the flow direction of the transversely flowing cooling air. The interior of the tube is divided by a separating wall extending transversely of the flow direction of the cooling air into a condenser stretch whose cross-section becomes smaller in the flow direction of the steam and a dephlegmator stretch whose cross-section becomes smaller in the flow direction of the steam, wherein the condenser stretch is at the lower end thereof connected to the dephlegmator stretch for conducting steam from the condenser stretch to the dephlegmator stretch, and wherein a gas/steam mixture exhauster is mounted at the upper end of the dephlagmator stretch.