DK2674718T3

DK2674718T3 - ASYMMETRIC PLATE HEAT EXCHANGE

Info

Publication number: DK2674718T3
Application number: DK13172071.6T
Authority: DK
Inventors: Matthias Funke
Original assignee: Kelvion Brazed Phe Gmbh
Priority date: 2012-06-14
Filing date: 2013-06-14
Publication date: 2019-01-28
Also published as: ES2705226T3; EP2674718A2; EP2674718A3; DE102012105144A1; EP2674718B1; DE102012105144B4

Description

The invention relates to a plate heat exchanger in an asymmetric design.

Background

Plate heat exchangers or heat transfer units usually have a stack of heat transfer plates, which are arranged between one or more limiting plates in such a way that passages for heat exchanger fluid, which are closed with respect to each other, are formed in the stack between the heat transfer plates. The passages providing flow channels are connected to ports, via which heat exchanger fluids are supplied and discharged during operation. Heating energy for cooling and/or heating is transferred between the heat exchanger fluids flowing through the plate heat exchanger via the heat transfer plates during operation.

To form the passages in the stack of heat transfer plates, the plates each have a profile. Meandering structures may also be provided for this. It has also been proposed to provide a profile using truncated pyramids (see: Journal of Enhanced Heat Transfer, 9: 171-170, 2002). By using the truncated pyramids, concave and convex shaped flow sections are generated for specific plate arrangements in the stack of heat transfer plates. The passages for the heat transfer fluids produced by means of a similar structure of all truncated pyramids on the stacked plates are designed for respectively equal volume flows. They each provide the same volume and have the same through-flow cross-sectional area.

Plate heat exchangers in an asymmetric design or structure provide, in contrast to such symmetrical plate heat exchangers, passages in the stack of heat transfer plates which differ due to different volumes or mass flows of the heat exchanger fluids flowing through the plate heat exchanger. Different volumes of passages are producible in particular by means of different through-flow cross sections. In contrast, the passages for plate heat exchangers in a symmetric design are configured to permit identical volumes or mass flows of the heat exchanger fluids, for which reason the passages generally have a uniform through-flow cross section. Asymmetric passages with different volume flows may be realized, for example, in that the passages have different passage surfaces transverse to the flow. Plate heat exchangers in an asymmetric design are particularly suited to meet different application conditions during the use of the plate heat exchanger, in particular in that the volume or mass flows in the passages are distinctly different. A plate heat exchanger in an asymmetric design is known from document EP 1 684 044 A2. The stacked heat transfer plates have main protrusions that are designed as truncated cones. Intermediate protrusions may be arranged between adjacent main protrusions. A plate heat exchanger with a stack of heat transfer plates is known from document EP 1 739 379 A2. The profile of the heat transfer plates has a truncated cone shape in cross section. Such a configuration is additionally known from document EP 2 455 694 A2.

Summary

It is the object of the invention to create a plate heat exchanger in an asymmetric design in which the asymmetric passages in the stack of heat transfer plates may be flexibly provided for different application purposes.

The problem is solved according to the invention by a plate heat exchanger in an asymmetric design according to independent claim 1. Advantageous embodiments of the invention are the subject matter of dependent subclaims.

According to one aspect, a plate heat exchanger in an asymmetrical design or structure is created, which has a stack of heat transfer plates, by means of which passages, closed with respect to each other, for heat exchanger fluids are formed. The heat transfer plates each have a profile formed with an arrangement of truncated pyramids protruding from the plate plane and base portions disposed therebetween in the plate plane. The base portions comprise the region between the truncated pyramids protruding from the plate plane, which have a plateau or a top face on the basis of their truncated form on the distal side opposite the heat transfer plate. The passages forming flow channels in the stake of heat transfer plates are designed asymmetrically, namely allowing different volume or mass flows. In adjacent heat transfer plates, the base portions of an upper heat transfer plate are arranged on the truncated pyramids of a lower lying heat transfer plate, preferably in the region of the top face of the truncated pyramids, wherein a partial or complete overlapping of the base portions with the assigned truncated pyramids may be provided.

The expression truncated pyramid in the form used here includes truncated structures with any base area, which include, in particular, round, square, oval, or circular base areas. These types of structures are also designated as truncated cones.

The provision of the profile with the truncated pyramids and base portions arranged therebetween, and also the arrangement in such a way that the base portions of the upper heat transfer plate are arranged on the truncated pyramids of the underlying heat transfer plate, facilitates a flexible and multifaceted configuration of asymmetrical passages in the stack of heat transfer plates. Thus, the respective plate heat exchanger may flexibly react to different operational requirements.

It is provided to alternatingly stack heat transfer plates, which have a first truncated pyramid shape and a second truncated pyramid shape that differs from the first truncated shape.

The profile comprises truncated pyramids with one or more concave side faces. The side faces of the truncated pyramid relate to the wall sections of the respective truncated structure, which extend from the plate plane of the heat transfer plate to the plateau or top face of the truncated pyramid. All truncated pyramids of one heat transfer plate may be formed with one or more concave side faces.

The profile comprises truncated pyramids with one or more convex side faces. Asymmetrical passages are produced in the stack of heat transfer plates in an efficient way, in that heat transfer plates are stacked alternatingly, in that plates with truncated pyramids with concave side faces and plates with truncated pyramids with convex side faces alternate. All truncated pyramids of a heat transfer plate may be formed with one or more convex side faces. A concave side face of a heat transfer plate and a convex side face of an adjacent heat transfer plate (opposing plate) are arranged opposite one another to form an asymmetrical passage.

One embodiment provides that for at least one of the heat transfer plates, the truncated pyramids all have the same truncated pyramid shape. The truncated pyramid shape is determined in particular by means of the following parameter: height, base area shape, and design of the side faces, for example, concave or convex. A refinement preferably provides that for at least one of the heat transfer plates, the truncated pyramids are formed with at least two different truncated pyramid shapes.

It may be provided for one embodiment, that at least two heat transfer plates arranged adjacent to each other in the stack of heat transfer plates have the same profile. In this embodiment, it may be provided that heat transfer plates arranged adjacent to each other in the stack are rotated 180° relative to each other. A refinement may provide that the adjacent heat transfer plates are joined together in the region in which the base sections are supported in the truncated pyramids. The joining of the heat transfer plates is carried out, for example, by means of soldering or welding. In this way, plate heat exchangers are formed in a soldered or welded design or structure.

It may be provided in one embodiment that the truncated pyramids have a base area selected from the following group of base areas: polygon, rectangle, square, triangle, circle and ellipse. The base areas of the truncated pyramids of one heat transfer plate may all be identical. A heat transfer plate may also have base areas of different shapes. In one stack of heat transfer plates, all plates may have truncated cones of identical base areas. It may also be provided that truncated cones with different base area shapes are arranged in the plates of a stack.

One embodiment provides that for at least one of the heat transfer plates, the profile is designed as a regular arrangement of truncated pyramids. A refinement preferably provides that for at least one of the heat transfer plates, a plateau width of the truncated pyramids is substantially equal to the width of the base portions between the truncated pyramids. If the truncated pyramids have a round shape in the region of the top face, then the diameter of the round top face may be substantially equal to the width of the base portion lying thereupon.

One embodiment may provide that for at least one of the heat transfer plates, the profile has a meander-shaped profile. In this case, for the at least one heat transfer plate, one or more profile sections with truncated cones on the one side and one or more profile sections with meander-shaped or herring-bone shaped profiles on the other side are combined, wherein the latter may be provided, for example, in the inflow and/or distribution regions of the plate stack.

It may be provided for one embodiment that the profile of the heat transfer plates is designed as an embossing pattern. The profile in this case is produced by means of an embossing method, in particular by using an embossing stamp, for example, for heat transfer plates made from metal.

Description of embodiments

Following, further embodiments are described with reference to the figures. In the figures, show

Fig. 1 shows a perspective depiction of a section of a stack of heat transfer plates for a plate heat exchanger,

Fig. 2 shows a schematic depiction for arranging truncated pyramids with square base areas in a stack of heat transfer plates,

Fig. 3 shows a perspective depiction of a truncated pyramid with convex side faces,

Fig. 4 shows a perspective depiction of a truncated pyramid with concave side faces,

Fig. 5 shows a schematic depiction of asymmetrical passages in a stack of heat transfer plates which are formed with truncated pyramids, which have alternating concave and convex side faces.

Fig. 1 shows a perspective depiction of a stack of heat transfer plates 1 for a plate heat exchanger or transfer unit, said heat transfer plates being provided with a profile 2 in such a way that truncated pyramids 3 protrude from a plate plane 4. Base portions 5 extend between truncated pyramids 3 in the plate plane 4. Openings 6 in the stack of heat transfer plates 1 function, when designing a plate heat exchanger, for connecting a conduit system, via which heat exchanger fluid may be supplied and discharged.

In the embodiment shown, profile 2 is designed with a regular arrangement of truncated pyramids 3. In the example shown, at least truncated pyramids 3 of the heat transfer plate arranged above in the stack are designed identically.

In the stack of heat transfer plates 1, heat transfer plates arranged adjacent to each other are rotated 180° relative to one another, such that base portions 5 of an upper heat transfer plate are arranged on truncated pyramids 3 of the heat transfer plate located therebelow. This is shown schematically in Fig. 2, in which truncated pyramids 3 are shown for two superposed, adjacently arranged heat transfer plates.

It may now be provided that truncated pyramids 3 have convex or concave side faces 7, 8, as the perspective depictions of a respective truncated pyramid show in fig. 3 and 4. Convex and concave side faces 7, 8 extend from base 9a up to top face (plateau) 9b of truncated pyramid 3.

When using these types of profiles with truncated pyramids 3 with concave and convex side face designs 7, 8, asymmetrical passages may be produced in the stack of heat transfer plates 1, as the schematic depiction in fig. 5 shows by way of example. There, a heat transfer plate 11 with concave truncated pyramids 11a is arranged on a lower heat transfer plate 10 with convex truncated pyramids 10a. A heat transfer plate 12 with convex truncated pyramids then follows thereon again, upon which a heat transfer plate 13 with concave truncated pyramids 13a follows. In the example shown, two additional heat transfer plates 14, 15 are finally arranged thereon, which have convex and concave truncated pyramids 14a, 15a. This, larger and smaller channels 16, 17 are created, which enable an optimized operation on the basis of the asymmetrical design, in particular in the case of different mass or volume flow of the heat exchanger fluids.

Independently of the previously mentioned exemplary embodiments, it may be provided that a profile is used with different shapes of truncated pyramids on one and the same heat transfer plate 1, in particular in order to configure inflow and/or distribution regions of the flow channels in the stack of heat transfer plates such that a most uniform flow distribution is achieved in the passage, in particular in order to optimally use the heat transferring surfaces in the stack of heat transfer plates 1.

It may also be provided, that one or more profile regions with truncated pyramids of the same or different shape, and one or more other profile regions, in which meander-shaped or herring-bone shaped profiles are formed, are used on one heat transfer plate 1. The combination of the different profiles facilitates, for example, the design of a most uniform flow distribution in the passage in the inflow and/or distribution areas of the flow channels in the stack of heat transfer plates. In this way, the heat transferring surfaces in the stack of heat transfer plates 1 may be optimally used.

The features of the invention disclosed in the preceding description, the claims, and the drawing may be of relevance both individually and also in any combination for the implementation of the invention in its various embodiments.

Claims

1. Pladevarmeveksler i en asymmetrisk udformning der omfatter en stak af varmeoverføringsplader, ved hjælp af hvilke der mod hinanden er dannet aflukkede passager til varmevekslerfluider, hvor - varmeoverføringspladerne har en profil (2) der er dannet med en indretning af trunkerede pyramider (3), som rager ud fra pladeplanet (4), og basissektioner (5) der er anbragt derimellem i pladeplanet (4), og - passagerne er konstrueret asymmetrisk, nemlig således at de tillader forskellige volumenstrømme, ved at for tilstødende varmeoverføringsplader i stakken af varmeoverføringspladerne, er basissektionerne (5) af en øvre varmeoverføringsplade anbragt ud for trunkerede pyramider (3) af en der under liggende varmeoverføringsplade, kendetegnet ved, at - profilen (2) har trunkerede pyramider med konkave sideflader (8), der strækker sig fra pladeplanet (4) af varmeoverføringspladerne til plateauet af de trunkerede pyramider; - profilen (2) har trunkerede pyramider med konvekse sideflader (7), der strækker sig fra pladens plan (4) af varmeoverføringspladerne til plateauet af de trunkerede pyramider; og - en varmeoverføringsplade der har trunkerede pyramider med konkave sideflader (8), og en varmeoverføringsplade der har trunkerede pyramider med konvekse sideflader (7), er anbragt skiftevis i stakken.A plate heat exchanger in an asymmetric configuration comprising a stack of heat transfer plates by means of which closed passages for heat exchanger fluids are formed, wherein - the heat transfer plates have a profile (2) formed with a device of truncated pyramids (3), projecting from the plate plane (4) and base sections (5) disposed therebetween in the plate plane (4), and - the passages are constructed asymmetrically, namely to allow different volume flows by, for adjacent heat transfer plates in the stack of heat transfer plates, being the base sections (5) of an upper heat transfer plate disposed adjacent to truncated pyramids (3) of an underlying heat transfer plate, characterized in that - the profile (2) has truncated pyramids with concave side surfaces (8) extending from the plate plane (4) of the heat transfer plates to the plateau of the truncated pyramids; the profile (2) has truncated pyramids with convex side faces (7) extending from the plane of the plate (4) of the heat transfer plates to the plateau of the truncated pyramids; and - a heat transfer plate having truncated pyramids with concave side faces (8) and a heat transfer plate having truncated pyramids with convex side faces (7) are arranged alternately in the stack.

2. Pladevarmeveksleren ifølge krav 1, kendetegnet ved, at for mindst en af varmeoverføringspladerne har de trunkerede pyramider (3) alle den samme trunkerede pyramideform.The plate heat exchanger according to claim 1, characterized in that for at least one of the heat transfer plates, the truncated pyramids (3) all have the same truncated pyramid shape.

3. Pladevarmeveksler ifølge krav 1 eller 2, kendetegnet ved, at for mindst en af varmeoverføringspladerne er de trunkerede pyramider (3) dannet med mindst to forskellige trunkerede pyramideformer.Plate heat exchanger according to claim 1 or 2, characterized in that for at least one of the heat transfer plates, the truncated pyramids (3) are formed with at least two different truncated pyramid forms.

4. Pladevarmeveksler ifølge mindst et af de foregående krav, kendetegnet ved, at mindst to varmeoverføringsplader der er arrangeret tilstødende til hinanden i stakken af varmeoverføringsplader, har samme profil (2), hvilke varmeoverfø- ringsplader der er arrangeret stødende op til hinanden i stakken, er roteret 180° i forhold til hinanden.Plate heat exchanger according to at least one of the preceding claims, characterized in that at least two heat transfer plates arranged adjacent to each other in the stack of heat transfer plates have the same profile (2), which heat transfer plates arranged adjacent to each other in the stack, is rotated 180 ° relative to each other.

5. Pladevarmeveksler ifølge mindst et af de foregående krav, kendetegnet ved, at de tilstødende varmeoverføringsplader er sammenføjet med hinanden i området, i hvilket basesektionerne (5) er understøttet på de trunkerede pyramider.Plate heat exchanger according to at least one of the preceding claims, characterized in that the adjacent heat transfer plates are joined together in the region in which the base sections (5) are supported on the truncated pyramids.

6. Pladevarmeveksler ifølge mindst et af de foregående krav, kendetegnet ved, at de trunkerede pyramider (3) har et basisareal, som er valgt blandt følgende gruppe af basisarealer: polygon, rektangel, firkant, trekant, cirkel og ellipse.Plate heat exchanger according to at least one of the preceding claims, characterized in that the truncated pyramids (3) have a base area selected from the following group of base areas: polygon, rectangle, square, triangle, circle and ellipse.

7. Pladevarmeveksler ifølge mindst et af de foregående krav, kendetegnet ved, at for mindst en af varmeoverføringspladerne er profilen (2) udformet som en regelmæssig indretning af trunkerede pyramider (3).Plate heat exchanger according to at least one of the preceding claims, characterized in that for at least one of the heat transfer plates, the profile (2) is formed as a regular device of truncated pyramids (3).

8. Pladevarmeveksler ifølge mindst et af de foregående krav, kendetegnet ved, at for mindst en af varmeoverføringspladerne er bredden af plateauet af de trunkerede pyramider (3) i det væsentlige lig med bredden af basissektionerne (5) mellem de trunkerede pyramider (3).Plate heat exchanger according to at least one of the preceding claims, characterized in that for at least one of the heat transfer plates, the width of the plateau of the truncated pyramids (3) is substantially equal to the width of the base sections (5) between the truncated pyramids (3).

9. Pladevarmeveksler ifølge mindst et af de foregående krav, kendetegnet ved, at for mindst en af varmeoverføringspladerne har profilen (2) en mæander-formet profil.Plate heat exchanger according to at least one of the preceding claims, characterized in that for at least one of the heat transfer plates the profile (2) has a meander-shaped profile.

10. Pladevarmeveksler ifølge mindst ifølge de foregående krav, kendetegnet ved, at profilen (2) af varmeoverføringspladerne er udformet som et prægemønster.Plate heat exchanger according to at least one of the preceding claims, characterized in that the profile (2) of the heat transfer plates is formed as an embossing pattern.