# US 4,398,596 A · Plate-type heat exchangers

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- Number: US 4,398,596 A
- Document ID: US4398596A
- Status: Granted
- Kind: A
- Application number: 06/063,333
- Filed: 1979-08-02
- Granted: 1983-08-16
- Earliest claimed: 1978-08-09
- Assignees: Commissariat a l'Energie Atomique
- Inventors: Fernand Lauro; Bernard Manon; Gerard Marie
- Web page: https://patentgrep.com/patent/US4398596A

## CPC

- B01D 1/221: {Composite plate evaporators}
- F25B 39/022: {with plate-like or laminated elements}
- F28D 9/0075: {the plates having openings therein for circulation of the heat-exchange medium from one conduit to another}
- F28F 13/08: by varying the cross-section of the flow channels
- F28F 13/14: by endowing the walls of conduits with zones of different degrees of conduction of heat
- F28F 2270/00: Thermal insulation; Thermal decoupling
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)

## Abstract

An improvement to the plate-type heat exchangers/vaporators constituted in per se known manner by a stack of a plurality of rectangular plates each having four orifices in the vicinity of the apices of the rectangle and thus constituting juxtaposed parallelelpipedic racks, alternately traversed in countercurrent by the hot fluid and the cold fluid, said cold racks having at their apex located in the vicinity of the cold fluid intake a strip having flow holes defining a cold fluid supply chamber and an evaporation chamber where the cold fluid evaporates by flowing as thin trickles in contact with the hot wall, the four orifices of each plate serving respectively for the admission and discharge of the cold and hot fluids, wherein the cold fluid intake is provided with a fitting or lining of a thermally insulating material which serves to create, by reducing the intake diameter, a supplementary pressure drop for said cold fluid and brings about a greater thermal gradient between said cold fluid and the hot plates in the supply pipe.

## Claims

### Claim 1

An improvement to the plate-type heat exchangers/evaporators constituted in per se known manner by a stack of a plurality of rectangular plates each having four orifices in the vicinity of the apices of the rectangle and thus constituting juxtaposed parallelepipedic racks, alternately traversed in countercurrent by the hot fluid and the cold fluid, said cold racks having at their apex located in the vicinity of the cold fluid intake a strip having flow holes defining a cold fluid supply chamber and an evaporation chamber where the cold fluid evaporates by flowing as thin trickles in contact with the hot wall, the four orifices of each plate serving respectively for the admission and discharge of the cold and hot fluids, wherein the cold fluid intake is provided with a fitting or lining of a thermally insulating material which serves to create, by reducing the intake diameter, a supplementary pressure drop for said cold fluid and brings about a greater thermal gradient between said cold fluid and the hot plates in the supply pipe.

### Claim 2 (depends on 1)

An improvement according to claim 1, wherein the separating strip between the supply chamber and the evaporating chamber also has a projection in the lower part thereof.

### Claim 3 (depends on 1)

An improvement according to claim 1, wherein the strips are traversed by surge tanks for balancing the pressure between the supply chambers and the evaporation chambers.