Heat exchange – Side-by-side tubular structures or tube sections
Patent
1984-02-29
1986-05-20
Richter, Sheldon J.
Heat exchange
Side-by-side tubular structures or tube sections
165162, 165910, F28F 106
Patent
active
045894817
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a heat exchanger comprising a set of tubes having essentially straight and parallel centre lines arranged in defined distances from each other, an inlet chamber for supplying a first medium to the tubes through a first wall that keeps the tubes together at the one end of the set of tubes, an outlet chamber for conveying away the medium from the tubes through a second wall that keeps the tubes together at the other end of the set of tubes, and a space between the tubes that at the ends of the tubes is delimited by mentioned walls for through-flow of a second medium, respective tube 14 along the main part of its length between the walls having a non-round cross-section form with two or more ridges 15, which extend helically round the centre line of the tube, and the tubes by their ridges 15 keeping each other on the defined distances from each other.
Such a heat exchanger is known by Russian Pat. No. 761.820. Thus, this publication discloses helical tubes resting against each other. In this connection the tubes touch each other with the tops of the ridges. This leads to that the space between the tubes becomes unnecessarily large for certain applications and that the heat exchanger does not get the desired, compact form.
These disadvantages are removed by the present invention that is characterized in that the tubes are so arranged in the heat exchanger that the distance between the centre lines of two adjacent tubes is less than the sum of the radii of the circles that circumscribe the two tubes.
Since the inside as well as the outside of the tubes have helical form the turbulence and due to that the heat transfer between the media will be essentially improved, whereby the heat transferring surfaces and thereby the heat exchanger can be made essentially smaller. Moreover, the tubes can be twisted in relation to each other in different ways such that the distances between the centre lines of the tubes will be different, whereby the size of the passages between the tubes can be made different such that the heat transfer in the passages between the tubes can be influenced. The tubes will support against each other in along the tubes regularly recurrent supporting points and the tubes are steadily kept together by one or several bands or similar things, which are tightened round the set of tubes. Since the helical tubes have the same cross-section form the pressure drop over and by that the flow through the tubes are the same. The tubes are easily rolled to a helical form from circular-cylindrical tubes, for instance by such a rolling machine disclosed in the Finnish Pat. No. 54.064.
According to a further development of the invention applied to a flattened tube form having two tops the ridges extend helically round the centre line of respective tube in the same direction on all of the tubes. In this connection the centre lines of the tubes are arranged with a dividing pattern in the form of squares and the tubes are so twisted in relation to each other that they touch each other with their ridges in cross-section planes through the set of tubes, where the flattened cross-section forms of the tubes form a pattern in the form of squares, the flattened cross-section forms touching each other at the ends and constitute sides of the squares.
According to a further development of the invention applied to the flattened tube form having two tops the passages between the tubes can be made still more narrow by arranging the centre lines of the tubes on several parallel levels above each other and in the same distance from each other, the centre lines on one level being laterally displaced in relation to the centre lines on a subjacent level such that the centre lines form a dividing pattern in the form of equilateral triangles that on each level the ridges of one tube extend helically round the centre line of the tube in one direction and the ridges of an adjacent tube extend helically round its centre line in the other direction and that the tubes are so twisted in relation to each other that
REFERENCES:
patent: 612175 (1898-10-01), Phelps, Jr.
patent: 1852489 (1932-04-01), Sullivan
patent: 2021117 (1935-11-01), Lucke
patent: 2230221 (1941-02-01), Fitch
patent: 3897821 (1975-08-01), Babunovic et al.
patent: 4206806 (1980-06-01), Togashi
patent: 4245697 (1981-01-01), Togashi
patent: 4393926 (1983-07-01), Appel
AB Zander & Ingestrom
Hapgood Cyrus S.
Richter Sheldon J.
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