Fin for heat exchanger
View Patent ↗A heat exchanger with at least one louver arrangement in the region between associated tubes for the heat transfer from one medium to another medium. The louver arrangement is provided with an inflow part and an outflow part corresponding to the inflow part. Both flow parts each have one outside louver, at least one intermediate louver and one inside louver, whereby the inside louvers are connected to each other and the louvers of one flow part are arranged inclined relative to the louvers of the other flow part and provided with louver geometry elements—length L, width B, angle of inclination α—, whereby between adjacent inclined louvers each there are passage slots for the flowing medium. The louver arrangement is provided at least in one of both flow parts with at least one at least single-curved intermediate louver and/or at least one multiple-curved outside louver and/or inside as geometry elements.
1. In a heat exchanger having at least one pair of adjacent tubes with a fin extending therebetween, the fin including at least one louver arrangement for heat transfer from a medium located in the tubes to a second medium flowing outside of the tubes and over the fin, the louver arrangement comprising:
an inflow part, an outflow part, both the inflow and outflow parts each having a series of adjacent louvers including an outside louver, at least one intermediate louver, and an inside louver, a plurality of passage slots formed in the fin and at least one passage slot being located between each adjacent louver, the inside louver of the inflow part being connected to the inside louver of the outflow part, all of the louvers of the inflow part being arranged inclined relative to all of the louvers of the outflow part such that the inflow part and the outflow part are symmetrical to one another, all of the louvers being provided with louver geometry elements of length L, width B, and an angle of inclination α, wherein the angle of inclination of at least one of the louvers of the inflow part is different from the angle of inclination of the remaining louvers of the inflow part and, proceeding from the outside louver of the inflow part to the inside louver, of the inflow part, the angles of inclination of the louvers progressively increase and thereafter decrease.
2. The heat exchanger of claim 1 wherein the angles of inclination of at least four of the louvers of the inflow part are different from the angles of inclination of the remaining louvers of the inflow part.
3. The heat exchanger of claim 1 wherein at least one of said intermediate louvers is a multiple-curved louver.
4. The heat exchanger of claim 3 wherein curvature within the at least one of said intermediate louvers is provided by a bend.
5. The heat exchanger of claim 3 wherein curvature within the at least one of said intermediate louvers is provided by an arch.
6. The heat exchanger of claim 1 wherein at least one of any of the louvers has a length unequal to a length of an adjacent louver.
7. The heat exchanger of claim 6 wherein the inflow part includes six louvers and the fourth louver in the inflow part has a longer length than the length of an adjacent louver.
8. The heat exchanger of claim 1 wherein at least one intermediate louver of either the inflow or outflow part has a width being unequal to a width of an adjacent intermediate louver.
9. The heat exchanger of claim 1 wherein at least three adjacent louvers of either the inflow part or the outflow part are provided with unequal angles of inclination such that between the three adjacent louvers there is defined a peak or a groove by the relative ends of these louvres.
10. The heat exchanger of claim 1 wherein the width of at least one of the louvers is different from the width of all of the other louvers.
11. The heat exchanger of claim 1 wherein at least some of the adjacent louvers define profiles of different shapes along their lengths the louvers.
12. The heat exchanger of claim 1 wherein the geometry elements are commonly provided in all of the louvers having equal louver widths, equal louver inclination angles or equal louver lengths.
13. The heat exchanger of claim 1 wherein the width of at least one of the louvers is different from the width of all of the other louvers.
14. In a heat exchanger having at least one pair of adjacent tubes with a fin extending therebetween, the fin including at least one louver arrangement for heat transfer from a medium located in the tubes to a second medium flowing outside of the tubes and over the fin, the louver arrangement comprising:
an inflow part, an outflow part, both the inflow and outflow parts each having a series of adjacent louvers including an outside louver, at least one intermediate louver, and an inside louver, a plurality of passage slots formed in the fin and at least one passage slot being located between each adjacent louver, the inside louver of the inflow part being connected to the inside louver of the outflow part, all of the louvers of the inflow part being arranged inclined relative to all of the louvers of the outflow part such that the inflow part and the outflow part are symmetrical to one another, all of the louvers being provided with louver geometry elements of length L, width B, and an angle of inclination α, wherein the angle of inclination of at least one of the louvers of the inflow part is different from the angle of inclination of the remaining louvers of the inflow part, and wherein at least one of said intermediate louvers is a single-curved intermediate louver defining a fin-top louver part and a fin-bottom louver part, each of the fin-top and fin-bottom louver parts defining an angle of inclination.
15. The heat exchanger of claim 14 wherein the fin-top louver parts have a common angle of inclination and at least one of the fin-bottom louver parts has an angle of inclination different from the angle of inclination of the remaining fin-bottom louver parts.
16. The heat exchanger of claim 14 wherein curvature within the at least intermediate louver is provided by a bend.
17. The heat exchanger of claim 14 wherein curvature within the at least intermediate louver is provided by an arch.
18. The heat exchanger of claim 14 wherein at least one of the intermediate louvers of each of the inflow part and outflow part are single-curved in the direction of their width (B) and provided with at least one louver-internal inclination angle change (α nO /α nU ) at an intersection point axis between a louver longitudinal axis and a fin surface plane, whereby the inclination angle change defines unequally oriented fin-top louver parts and unequally oriented fin-bottom louver parts.
19. The heat exchanger of claim 18 wherein the orientation of the fin-top louver parts is equal and at least one of the fin-bottom louver parts is provided with a different orientation to the others of the fin-bottom lover parts.
20. The heat exchanger of claim 18 wherein the orientation of the fin-bottom louver parts is equal and at least one of the fin-top louver parts is provided with a different orientation to the others of the fin-top louver parts.
21. The heat exchanger of claim 14 wherein at least one louver in relation to all of the other louvers has an inhomogeneous length and wherein at least one louver has an inhomogeneous upper/lower louver part inclination angles α nO /α nU in relation to all of the other louvers.
22. The heat exchanger of claim 14 wherein the inflow part and the outflow part have different lengths (L/L′) of various louvers.
23. The heat exchanger of claim 14 wherein at least one of any of the louvers has a length unequal to a length of an adjacent louver.
24. The heat exchanger of claim 23 wherein the inflow part includes six louvers and the fourth louver in the inflow part has a longer length than the length of an adjacent louver.
25. The heat exchanger of claim 14 wherein at least some of the adjacent louvers define profiles of different shapes along their lengths the louvers.
26. The heat exchanger of claim 14 wherein the geometry elements are commonly provided in all of the louvers having equal louver widths, equal louver inclination angles or equal louver lengths.
27. In a heat exchanger having at least one pair of adjacent tubes with a fin extending therebetween, the fin including at least one louver arrangement for heat transfer from a medium located in the tubes to a second medium flowing outside of the tubes and over the fin, the louver arrangement comprising:
an inflow part, an outflow part, both the inflow and outflow parts each having a series of adjacent louvers including an outside louver, at least one intermediate louver, and an inside louver, a plurality of passage slots formed in the fin and at least one passage slot being located between each adjacent louver, the inside louver of the inflow part being connected to the inside louver of the outflow part, all of the louvers of the inflow part being arranged inclined relative to all of the louvers of the outflow part such that the inflow part and the outflow part are symmetrical to one another, all of the louvers being provided with louver geometry elements of length L, width B, and angle of inclination α, wherein the angle of inclination of at least one of the louvers of the inflow part is different from the angle of inclination of the remaining louvers of the inflow part and wherein at least one of the intermediate louvers is multiple-curved in direction of their width, wherein a multiple-curved louver includes a louver-internal inclination angle change at an intersection point axis between a louver longitudinal axis and a fin surface plane and at least one louver-internal inclination angle change in at least one axis that is outside of the intersection point axis between the louver longitudinal axis and the fin surface plane parallel to the intersection point axis.