Roller for forming heat transfer elements of heat exchangers

1. A roller for forming heat transfer elements of heat exchangers, the roller comprising:

a central shaft; and a plurality of roller elements, each defining an outer periphery, each roller element comprising a geometrical characteristic configured across the outer periphery thereof, the plurality of roller elements adapted to be stacked on the central shaft,

the stacked roller elements on the central shaft configures the roller with a circumferential surface corresponding to the geometrical characteristic of the stacked roller elements, to form the heat transfer elements corresponding to the circumferential surface;

wherein the geometrical characteristic of each of the roller elements has at least a first section of a first geometric characteristic and a second section of a second geometric characteristic positioned on a circumferential periphery of each of the roller elements, such that the circumferential surface of the stacked roller elements has at least the first geometric characteristic and the second geometric characteristic; and

wherein the first geometric characteristic is different from the second geometric characteristic.

2. The roller as claimed in claim 1 , wherein each roller element comprises a cutout, defining an inner periphery opposite to the outer periphery, through which each roller element is stacked on the central shaft.

3. The roller as claimed in claim 2 , further comprising an engaging arrangement to enable stacking of the plurality of roller elements on the central shaft, wherein the engaging arrangement comprises:

an engaging member extending longitudinally on a surface of the central shaft; and a complementary engaging member extending downwardly from the inner periphery of each roller element to match the engaging member to stack the plurality of roller elements on the central shaft.

4. The roller as claimed in claim 3 , wherein the engaging member is a groove.

5. The roller as claimed in claim 3 , wherein the complementary engaging member is a protrusion.

6. The roller as claimed in claim 1 , wherein each roller element is a substantially thin metallic sheet having one of a flat shape or a non-flat shape, cut from a metallic sheet.

7. The roller as claimed in claim 1 , wherein each roller element is shaped in one of a circular shape or a non-circular shape.

8. A roller for forming heat transfer elements of heat exchangers, the roller comprising:

a plurality of roller elements, each defining an outer periphery, each roller element comprising a geometrical characteristic configured across the outer periphery thereof, the plurality of roller elements adapted to be stacked to configure the roller with a circumferential surface corresponding to the geometrical characteristic of the stacked roller elements, to form the heat transfer elements corresponding to the circumferential surface;

wherein the geometrical characteristic of each of the roller elements has at least a first section of a first geometric characteristic and a second section of a second geometric characteristic positioned on a circumferential periphery of each of the roller elements, such that the circumferential surface of the stacked roller elements has at least the first geometric characteristic and the second geometric characteristic; and

wherein the first geometric characteristic is different from the second geometric characteristic.

9. The roller as claimed in claim 8 , wherein each roller element is shaped in one of a circular shape or a non-circular shape.

10. The roller as claimed in claim 8 , wherein each roller element is a substantially thin metallic sheet having one of a flat shape or a non-flat shape, cut from a metallic sheet.

11. A roller arrangement for forming heat transfer elements of heat exchangers, the roller arrangement comprising:

a pair of rollers, each roller comprising,

a plurality of roller elements, each defining an outer periphery, each roller element comprising a geometrical characteristic configured across the outer periphery thereof, the plurality of roller elements adapted to be stacked to configure the roller with a circumferential surface corresponding to the geometrical characteristic of the stacked roller elements, the pair of rollers disposed parallel in spaced manner to configure a nip,

the pair of rollers rotatable along respective axes for enabling the nip to receive metallic sheets to form the heat transfer elements corresponding to the circumferential surface;

wherein the geometrical characteristic of each of the roller elements has at least a first section of a first geometric characteristic and a second section of a second geometric characteristic positioned on a circumferential periphery of each of the roller elements, such that the circumferential surface of the stacked roller elements has at least the first geometric characteristic and the second geometric characteristic; and

wherein the first geometric characteristic is different from the second geometric characteristic.