Heat exchange – Flow passages for two confined fluids
Patent
1987-10-01
1988-11-08
Koczo, Michael
Heat exchange
Flow passages for two confined fluids
165183, F28D 702, F28F 114
Patent
active
047828927
DESCRIPTION:
BRIEF SUMMARY
This U.S. application stems from PCT International application No. PCT/SE84/00282 filed Aug. 22, 1984.
The heat transfer between two heat transporting media is influenced by many factors, but it is obvious that it is advantageous to provide for a good contact between the various components. When the transportation path includes components of different kinds and possibly also of different materials the inventor has found that a superior method of ensuring a high heat conductivity is to embed one component into an other by casting.
The aim of the present invention is to propose a heat exchanger having high heat transmission properties, and which is characterized in that the core includes at least one block of a metal having a high heat conducting capacity, into which at least one tube for the first medium is embedded by casting, and which at its inward and/or outward face is provided with surface enlarging flanges to present contact surfaces towards the second medium several times larger than what the tube(s) presents towards the first medium.
The block may be prismatic and encloses a number of tubes. Alternatively the block may be annular.
In order to improve the heat transfer from, or to, a block in which the flanges run in parallel to its longitudinal axis the flanged face of the block is cut transversely by grooves subdividing the face into fields wherein the flanges in one field are displaced sidewardly so as to be aligned with the gaps in an adjacent field in order to provide a tortuous flow path for the second medium along said face of the block.
The bonding between the tube and the metal as well as the heat transfer therebetween is enhanced by the outward face of the tube being rugged. The tube is preferably made of stainless steel, which is better suited than the material in the block to withstand corrosion, and which also has good bonding properties with respect to the enclosing metal.
A number of flanges can advantageously be formed in an extruded bar of metal, adapted, together with further bars, to form a mould into which the tube enclosing block is cast.
In a heat exchanger comprising a number of blocks mounted within the same casing the flanges in one of the blocks may extend into gaps between flanges in an other block. Alternatively the flanges at juxtaposed block faces may meet edge to edge.
A number of panel-shaped blocks, each including at least one row of first medium transferring tubes may be fitted within a casing, which is passed through by a heat transporting gas, and where the tubes are connected to distribution and collecting headers for the first fluid.
The first heat transporting medium may be electric current, in which case a number of tubes enclosing electric resistances are cast into a tubular block, which is interiorly and exteriorly contacted by a heat removing fluid.
The invention will below be described with reference to the accompanying drawings, in which FIG. 1 schematically shows a heat exchanger element according to the invention, FIG. 2 shows a cross section through a heat exchanger containing an element according to FIG. 1, FIG. 3 shows a cross section through a heat exchanger, similar to that of FIG. 2, but having a bigger element, FIG. 4 shows a heat exchanger having elements of a modified form, FIG. 5 shows a detail of a heat exchanger element of a further modified form, FIG. 6 shows a detail of a heat exchanger having heat exchanger elements according to FIG. 5, FIG. 7 shows a longitudinal section through a exchanger heat by electric resistance elements, FIG. 8 is a cross section through the heat exchanger according to FIG. 7, FIG. 9 shows a cross section through a heat exchanger core composed of several elements, and suited for instance for use with a heat exchanger according to FIG. 7, FIG. 10 shows a detail of a heat exchanger comprising two heat exchanger elements according to FIG. 5, FIG. 11 shows, on a larger scale, a detail of a surfaceenlarging flange at a heat exchanger element, FIG. 12 shows a detail of an element where the surfaceenlarging flanges are f
REFERENCES:
patent: 1821434 (1931-09-01), Hamilton
patent: 1840651 (1932-01-01), Bassler
patent: 1952896 (1934-03-01), Rudorff
patent: 2405722 (1946-08-01), Villier
patent: 2779972 (1957-02-01), Keni
patent: 3467180 (1969-09-01), Pensotti
patent: 3493042 (1970-02-01), Burne et al.
patent: 3602298 (1971-08-01), Ciesielski
patent: 4487256 (1984-12-01), Lutzene et al.
Koczo Michael
Neils Peggy
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