Tube heat exchanger

Claim 2

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 along the main part of its length between the walls having a non-round cross-section form with two or more ridges, which extend helically round the centre line of the tube, and the tubes by their ridges keeping each other on the defined distances from each other, characterized in that at least certain of the tubes (14) are applied so in the heat exchanger that the distances (A 1 ,A 2 ) between the centre lines of two adjacent tubes are less than the sum of the radii of the circles that circumscribe the two tubes, each respective tube having a flattened cross-section form with two ridges extending helically round the centre line (2) of the respective tube (14) in the same direction for all tubes, the tubes being so arranged that their centre lines form a dividing pattern in the form of squares, the tubes being so arranged in relation to each other that they touch each other with their ridges (at 18) in cross-section planes through the set of tubes, in which the flattened cross-section forms of the tubes form a pattern in the form of said squares, the flattened cross-section forms touching each other at the ends and constituting sides of the squares.

Claim 3

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 along the main part of its length between the walls having a non-round cross-section form with two or more ridges, which extend helically round the centre line of the tube, and the tubes by their ridges keeping each other on the defined distances from each other, characterized in that at least certain of the tubes (14) are applied so in the heat exchanger that the distances (A 1 ,A 2 ) between the centre lines of two adjacent tubes are less than the sum of the radii of the circles that circumscribe the two tubes, each respective tube (14) having a flattened cross-section form with two ridges (15), the centre lines (2) of the tubes being arranged on several parallel levels (19) above each other, the ridges of one tube on each level (19) extending helically round the centre line of the tube in the one direction (R) and the ridges of an adjacent tube on said level (19) extending helically round the centre line of the tube in the other direction (L), the tubes (14) being so arranged that their centre lines (2) form a dividing pattern in the form of equilateral triangles, the tubes (14) being arranged in relation to each other so that at such a cross-section through the set of tubes in which the flattened cross-section form of a tube forms a right angle with the flattened cross-section form of an adjacent tube on the same level (19), there these two adjacent tubes rest against each other at supporting points (20).

Claim 4

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 along the main part of its length between the walls having a non-round cross-section form with two or more ridges, which extend helically round the centre line of the tube, and the tubes by their ridges keeping each other on the defined distances from each other, characterized in that at least certain of the tubes (14) are applied so in the heat exchanger that the distances (A 1 ,A 2 ) between the centre lines of two adjacent tubes are less than the sum of the radii of the circles that circumscribe the two tubes, each respective tube (14) having a flattened cross-section form with two ridges (15), the centre lines (2) of the tubes being arranged on several parallel levels (19) above each other, the ridges of one tube on each level (19) extending helically round the centre line of the tube in the one direction (R) and the ridges of an adjacent tube on said level (19) extending helically round the centre line of the tube in the other direction (L), the tubes (14) being so arranged that their centre lines (2) form a dividing pattern in the form of equilateral triangles, the tubes (14) being arranged in relation to each other so that at such a cross-section through the set of tubes in which the flattened cross-section form of a tube forms a right angle with the flattened cross-section form of an adjacent tube on the same level (19), there these two adjacent tubes rest against each other at supporting points (20).