GB114863A - - Google Patents

Abstract

114,863. Pease, E. L., Bell, A., and British Still Tube Co. March 6, 1917. Straight tubes between headers.-Relates to apparatus for heating air in the ventilation of buildings, drying of fabrics, &c., in which the air is blown by a fan 28 or drawn over the surfaces of heating tubes furnished with radiating gills or plates. According to the invention, the apparatus is built up of two or more units or sections 1, Figs. 1 and 2, each comprising heat-conveying tubes 4 passing through heat-distributing plates or gills 5 and provided with end heaters 2, 3, preferably of rectangular shape, adapted to fit together so as to form the side walls of the conduit through which the air passes. Steam is supplied to the sections through a common supply pipe 14 having valved branches 12 and intermediate supply pipes 18, and the condensed steam is led away through a drain pipe 17 with branch connexions 15 and through intermediate drain pipes 19. The front header 2 of each section is divided by a horizontal partition so that steam entering a section from a pipe 18 passes to the rear header and returns to the lower part of the front header, whence it is conducted to the drain pipe 17. In the arrangement shown, the sections are arranged in two tiers of four sections each and the pipes 18, 19 are inclined and so connected with the sections that by operation of the valves 13, the first section of the lower tier or the last section of the upper tier can be cut out independently, the other sections being cut out in pairs. The number of the tubes 4 used in proportion to the number of radiating plates or gills 5 is chosen according to the temperature requirements. In order to facilitate the introduction of a cleaning tool or of an expanding tool for connecting the tubes to the plates 5, the headers 2, 3 may have removable end plates or be provided with openings opposite the tubes closed by screw plugs. A cover plate 25 forms the upper wall of the air conduit. Modifications are described in which the tubes are arranged vertically to form a high battery of small depth and in which the tubes are arranged horizontally to form a battery of small height, the headers being coupled directly with the steam supply and drain pipes.