Patent GB-691967-A (GB)
Title: Laminated heat exchanger
IPC: F28F3/08
Filed: 1949-07-19
Abstract: 691,967. Plate heat-exchangers. AIR PRE-HEATER CORPORATION. July 19,1949 [July 24 1948], No. 19013/49. Class 64 (iii). A core for heat exchange between two fluids, comprises a stack of plates each formed with a multiplicity of spaced perforations arranged in uniform patterns and so disposed in the various plates that the perforations of contiguous plates align as parts of parallel fluid passages through the core and the ligaments between adjacent perforations' in certain of said plates constitute fins in said fluid passages. The fluids may operate in parallel or contra-flow or alternatively in cross-flow through the core. In one parallel or contraflow arrangement, A type plates 11 (Fig. 2) alternate with B type plates 12 (Fig. 3), pinfins being formed in the fluid passages by the ligaments 24 between the perforations in the A plates. By using C type plates (Fig. 4) instead of the B type, pin-fins 30 occur in one set of alternate fluid passages and continuous fins are formed in the other set of fluid passages (see Fig. 12). The continuous fins may be interrupted by the insertion of B type plates at intervals in the stack of plates. Alternatively the stack may comprise A type plates only or A type plates interrupted at intervals with B type plates. By using special A type plates in which the perforations are indexed at varying distances from one edge, sinuous or staggered fins may be formed in the fluid passages. Inlet and outlet manifolds for connection to headers may be formed at each end of the core by stacking together a number of F type plates Fig. 1 (not shown). Alternatively and as shown in Fig. 16, stacked zig-zag plates 40 may form the header manifolds and in this form second ary heating surfaces are formed within the manifold chambers 45, 46 by the insertion of perforated plates 55 at intervals between the plates 40, the plates 55 being generally similar to the A type plates but hav. ing rectangular openings. Fig. 14 shows a cross. flow arrangement in which A type plates alternate with D or D' type plates (Figs. 5, 5A) which are wider than the A plates and are cut-off after assembly with the A plates along the lines X-X so that they each form in effect a number of spaced distance pieces between which one fluid may flow in cross-wise relat. ion to a fluid flowing through the slot portions 62 or perforations 67 respectively and the aligned perfor. ations in the A plates. The cross-flow passages are closed at their lateral ends by E plates as shown in Fig. 14 or by E' plates, Fig. 6A (not shown), both sets of fluid passages in the core being connected to inlet and outlet manifolds (e.g. as in Fig. 17 not shown). The individual plates may be of any convenient shape e.g. rectangular as shown, or circular annular or oval. The Specification as open to inspection under Sect. 91, describes further cross flow arrangements comprising stacked F and G<SP>1</SP> plates and F' and G<SP>1</SP> plates and F<SP>1</SP> and G plates (see Figs. 7 to 10 Cancelled) and a cross-flow arrangement employing F and G type plates only (see Fig. 21 Cancelled). In these arrangements the F and F<SP>1</SP> type plates are cut off along the lines Y-Y after stacking. A contra-flow arrangement is described employing only the special A type plates mentioned earlier alternating with B type plates (see Fig. 14 Cancelled). This subject-matter does not appear in the Specification as accepted.