GB766331A - Improvements in or relating to heat exchangers - Google Patents

Abstract

766,331. Making heat exchangers. FRASER & CO., Ltd., W. J. Jan. 20,1955 [Jan. 22,1954; June 9, 1954], Nos. 2060/54 and 16890/54. Class 83 (2). [Also in Group XIII] In a method of making a heat exchanger element a metal sheet 10, Fig. 1, with angled flanges 12, 13, is corrugated to form heatexchange passages 16a, 16b, Fig. 2, and the contacting flanges are welded together at the edges to enclose the ends. A heat exchanger may be formed by welding a pair of such elements in mirror formation on a plate 22, Fig. 4, which does not extend the full length. The elements are held by welds 22a and by a welded flange 23 surrounding one end and an angle member 15 welded between the adjacent edges at the other end. The assembly is inserted in a casing 20 and held in position at one end only by bolting the flange 23 under a flanged end casing 26b. In operation high pressure fluid P<SP>1</SP> entering the end casing 26a passes round the far end of the plate 22 through opposed passages in the corrugations which are sealed at the ends and leaves through the end casing 26b. Low-pressure fluid P<SP>2</SP> enters the casing 20 through a port 27a at the side and passes through the passages in the corrugations to the other end of the casing and through open-ends to the other side of the plate 22 and back to the exit port 27b on the opposite side. In a modification more than one pair of elements may be arranged in a container so that the flow is reversed three or more times. In other examples the elements are formed in such a manner that the flanges 12, 13, Fig. 1, are bent to the same side of the sheet so that the passages on one side are closed at both ends and the passages on the other side are open at both ends. These elements may be assembled in a casing 40, Fig. 10, having an inlet 42a and outlet 42b for one fluid P<SP>1</SP> at the ends of one side in communication with the passages having the enclosed ends. The other fluid p<SP>2</SP> passes through the open-ended passages from the ends 41a of the container. In another application elements 53, Fig. 11, form the outer wall of a transformer casing and are welded to a base 56 and a frame 54 for the cover 55. Plates 51 on the inner side restrict the flow for the hot oil P<SP>3</SP> to the ends of the elements while flow for the cooling air P<SP>4</SP> on the outer face is unrestricted through the open-ended passages. In another example similar elements are attached on the inside face of vessels containing fluids which are to be heated or cooled.