GB1336448A - Heat exchangers - Google Patents

Abstract

1336448 Plate heat exchangers CENTRE SCIENTIFIQUE ET TECHNIQUE DU BATIMENT 14 Dec 1970 [12 Dec 1969] 59386/70 Heading F4S A cross-flow heat exchanger is formed from a stack of plates la, 1b, 1c, 1d, joined in pairs at their inlet edges 2 and 3 to define cross-flow passages in the directions A and B for the heat exchanger fluids. Each plate has upper and lower sets of integral studs 9, which sets are offset from one another, and which co-operate with the studs of super and subadjacent plates to define the fluid flow passages. Deflectors (22, Fig. 8, not shown) may block off certain of these passages. Fluid flow fans (not shown) may be located in headers adjacent the heat exchanger fluid outlets. Angle irons 15 hold the plates together between two rigid end plates to form a heat exchanger member (Fig. 6, not shown). Such a member may be mounted in an inclined position (Fig. 17, not shown) or be detachably secured to other such members to make up a heat exchanger assembly of large capacity (Fig. 7, not shown). The plates may be formed by stamping, forming, calendering or embossing metal, or by cold stamping, hot stamping, hot vacuum forming, hot forming, blowing or continuously calendering over studded cylinders, an antistatically treated plastics, such as cellulose acetate, cellulose acetobutyrate, cellulose proprionate, polyvinylchloride and vinyl copolymers, polystyrene, butadiene styrene acrylonite, high density polyethylene, polypropylene, polymethylpentene, polymethylmethacrylate, butadiene styrene methacrylate and polycarbonate, or from plastics coated metal. In use, air extracted from a building flows in one direction and heats or cools a forced fresh air flow in the other direction. To prevent possible frosting up of the heat exchanger the fresh air flow to it may be controllably preheated by an electrical resistor or a hot water radiator in the inlet duct to the heat exchanger (Figs. 9 and 10, not shown), or the fresh air flow to it may be controllably throttled by a sliding shutter located close to its inlet to reduce the air flow through its coldest portion (Fig. 12, not shown), or a controllable by-pass around it may be provided (Fig. 15, not shown), or a brine solution may be controllably trickled from an upper manifold to a lower reservoir over the inclinedly mounted plates on the air extraction side, incidentally cleaning them (Fig. 14, not shown), or a substance may be controllably sprayed into the extracted air upstream of the heat exchanger to prevent condensation and freeze up on cooling, the control in each case being determined by the fresh air inlet temperature.