Patent GB-658767-A (GB)
Title: Improvements relating to heat exchange devices for room heating
IPC: F28F21/08
Filed: 1948-09-04
Abstract: 658,767. Radiators for heating buildings;: heating air; cooling liquid in transformer tanks; tubular heat-exchange elements. UNGARISCHE RADIATOREN FABRIKS AKT.-GES. Sept. 4, 1948, No. 23337. Convention date, Sept. 6, 1947. [Classes 64(ii) and 64(iii)] In a radiator for heating a room, one or more tubes 1, having slotted longitudinal fins 2 extending in opposite directions and made in one piece with the tube, is or are arranged to form a heat-radiating wall, e.g. if there is one tube it is bent for this purpose. The fins 2 may lie in a plane through the axis of the tube or in a plane tangential to the tube as in Fig. 2 which shows a finned tube made of aluminium having fins in which the slots 3 form louvres. In one embodiment, the finned tube is wound helically to form a cylindrical air-heating flue of circular or elliptical cross-section closed at the bottom so that air enters through the slots 3 and gaps between the adjacent fins. As shown in Fig. 6, the finned tube is bent in serpentine form, the fins 2 being cut away at the bends 14. In another embodiment, the finned tubes form between headers a wall which may be flat or curved by bending the tubes and fins to hairpin shape. The fins may have tongues 10 and grooves 9 so that adjacent fins engage at their edges. The Specification as open to inspection under Sect. 91 describes also a tubular element, for heat exchange apparatus, e.g. for heating, cooling, condensing and drying apparatus, having at least one longitudinal fin 2, perforated or slotted over at least part of its area, e.g. to form louvres 3 and formed integrally with the tube 1 in a single operation from an ingot, e.g. of aluminium, by pressing, rolling and/or drawing. If there is more than one fin, one or more may be unslotted. When used as the external oil-cooling conduits on transformer tanks, the tubes 1 are formed with internal ribs 13 and/or partition walls 12, Fig. 8 (Cancelled). In this construction, the tubes are either bent to U-shape and connected to the transformer tank 15, Fig. 23 (Cancelled), or straight lengths are connected to chambers 18 spaced from the tank walls. In either case, straight tube lengths are arranged parallel in single or double rows with the fins abutting to enclose, against or near the tank wall, an openended space 16 to induce convection currents of air through the fin perforations. When used for example in a steam superheater, the tube 1 is bent to the flat sinuous shape shown in Fig. 6, but in this application the fins may enclose an acute angle so that the adjacent fin lengths form a corrugated wall. The tubes may connect between plates 11, see Fig. 15 (Cancelled) which shows an arrangement to be used as a car cooling radiator. When applied to an economiser or air cooler, for an electric generator for example, Fig. 17 (Cancelled) not shown, the tubes 1 have four radial fins and the tubes are grouped with the fins perpendicular to one another, the outer fins being unslotted to form enclosing walls. In a geyser, combustion gases heat liquid in the helical form of finned tube.' This form is used also in a condenser. This subject-matter does not appear in the Specification as accepted.