DE102018006434A1 - Heat exchanger board, profile pointed on flat - Google Patents

Abstract

Heat exchangers made of superimposed, meandering profiled heat exchanger boards, the profile elements pointing upwards being each formed as a flat horizontal (5) and the profile elements pointing downwards being pointed and the tip standing on the flat horizontal (5) of the adjacent plate. This tip can be shaped like a house roof (2) or as a triangle (3b). Furthermore, a zigzag profile profile (seen in the direction of flow) is possible, the profile structures being able to run synchronously with one another, partially offset from one another, or lying crosswise one above the other. Mutual support is achieved with the latter two variants. The zigzag shape enables improved heat transfer and a larger heat exchange surface.

Description

The invention relates to a heat exchanger board according to the preamble of the patent claim.

Out DE10329153 . DD243088 . DE4333904 and DE102005012000, heat exchangers made of superimposed boards with a rectangular or trapezoidal profile are known.

In the case of cost-effective heat exchanger production (low material costs), large profile heights are aimed for, the problem being the deep-drawing process. With large profile heights H there is a risk of material thinning and hole formation in the above profiles (due to the more pronounced corners). This risk can be significantly reduced with the new profile. The better deep-drawing properties also lead to an increase in the maximum profile height by approx. 10% compared to the above-mentioned prior art.

In addition, the pressure loss (with a comparable profile width and height) is reduced with the new profile compared to the above profiles (rectangular and trapezoidal profile). With the zigzag profile with straight intermediate levels (see 17 ) of a Dutch manufacturer (RecAir), the material is only insufficiently converted into a heat exchange surface (not deep-drawn) due to the straight intermediate level, which can be seen as a material and thermal disadvantage. When laying boards with a crosswise profile profile on top of each other, the new profile has advantages over the rectangular / trapezoidal profiles (crosswise: patent no. DE29916493 and DE29824920 ), since there are no flat surfaces that are not to be regarded as heat exchange surfaces. By rounding off ( 5a ) or flattening ( 5b ) of the corners, a better deep-drawing success can be achieved, ie thinning and holes in the deep-drawing material can be largely avoided.

Through a (seen in the direction of flow) zigzag ( 6 ) or sinusoidal ( 7 ) Profile structure ( 6 . 7 ) the length of the flow thread and thus the residence time and heat exchange time can be increased, which leads to an improvement in the heat exchange performance. The heat exchange area increases due to the zigzag structure ( 6 to 10 ) by approx. 6%, whereby the area losses ( R ) at the edge ( 6b) are factored in.

The profile according to the invention is based on a meandering rectangular profile, one horizontal side (the lower ( 3 ) or the top ( 4 )) each as a tip ( 3 . 4 ) is trained. The tip can be turned outwards ( 3 . 4 ) ( 1a . 1b) or inside (3a) ( 3a) demonstrate. Each tip stands ( 3 . 4 ) each on a horizontal ( 5 ) of the neighboring board on ( 1 to 3a and 4 ). According to the profile 3a can replace the horizontal ( 5 ) also an inward-pointing tip ( 3e ) be set ( 3b) ,

Instead of the top ( 3 . 4 - similar to a house roof) can also have a triangular shape ( 3b . 3c ) be used ( 1c . 1d ). The angles of the tip on both sides can be equal (a = β, see 1c . 4a) or be different. Basically, when designing the tip ( 3 . 4 ) any angle 0 <α × 90 ° possible, e.g. B. α = β = 45 ° or a = β = γ = 60 °. However, if the angle is too small, e.g. B. at α = 20 ° or γ = 20 °, the sliding friction related to the narrow flow cross-section ( 4a ) in the angular range ( 4b . 4c ). As a result, the flow velocity and the heat transfer coefficient decrease in this area.

A larger angle, e.g. B.α = β = 45 ° ( 1a) or α = β = γ = 60 ° ( 4a) enables a higher flow velocity (lower wall friction), which has a positive effect on the heat transfer coefficient and the pressure loss.

At a smaller angle α . β however, a higher heat exchange surface is also achieved ( 4b) , With the tip pointing inwards ( 3a . 3e ) the heat exchange surface can be increased again ( 3a . 3b) ,

The roof-like profile shapes ( 1a . 1b . 4 and 5 ) and the profile according to 3 can also be used with a sloping wall ( 3d ) are carried out (example in 2 ), which improves the deep-drawing properties.

The profiles according to 1 to 5 can also be placed on top of each other in such a way that the adjacent board takes on the same (synchronous) shape (profile arrangement A see e.g. B. 9 . 10c . 14c ).

This profile arrangement A is possible on the one hand through a ride ( 5c ), which if possible only over a limited section ( L ) extends ( 8a) , but also if contact edges ( 11 . 13 . 18a ) ensure a secure support of the superimposed boards ( 9 . 10b . 10c . 13a . 13b . 14b to d ).

With a zigzag profile profile (seen in the flow direction) ( 6 ) the heat transfer coefficient α is increased by turbulence ( 6 . 8th . 9 . 10 ). The superimposed profiles can be synchronized ( 8th . 9 ) ( 8th . 10a) or crosswise ( 11 ) ( 9 ) run. In the case of a crosswise course, the profiles are supported on contact edges ( 11 ). Another variant The profiles of two adjacent boards run synchronously - but the adjacent pair of profiles then has a cross-wise course of the zigzag structure to the first pair. Due to the zigzag profile profile seen in the flow direction, especially with large profile heights ( 20 ) ( 15 ) also the flow area located at a greater profile depth e ( 9 ) swirled, caused by the frequent deflection at the corners ( 6 . 12 ) ( 6 . 9 . 10 ). This means an advantage over profile structures (rectangular profile - 21), whose course (inclined at a certain angle) runs across the board (from right to left - and upside down) ( 16 - State of the art - see DE29916493 . DE29824920 ). Here takes place at the crossing points ( 22 ) mixing (part of the flow "drills" into the flow channel on the next floor), but not down to the profile depth (area e - Dead area - analogous to 15 ) into it. This only happens in the peripheral zone ( R1 ) ( 16c ) when redirecting the flow into the adjacent flow channel.

The entry and exit of the flow into the profile structure in a countercurrent heat exchanger is not described in detail in the above two patents / utility models, but in DD243091 and DE4333904 the flow distribution in the profile structure (channel distributor), as it is used similarly in the novel profile, is explained in more detail.

The advantage of swirling can also be increased by V-shaped bulges ( 14 . 17 ) can be reached ( 11 . 12 ). The V-shaped bulge can run synchronously on all superimposed boards ( 14a) , In the variants with a longitudinal or transverse offset of the V-shaped (or U-shaped) bulge ( 14b to d ) mutual support ( 18a ) of the superimposed profiles. This can also be achieved if only every other board has such an offset and the neighboring board has a straight course at this point ( 18 ) takes - see crossing point (= contact edge ( 18a )) in 13 ,

In 13a is the offset of the V-shaped bulge ( 14 ) by 1 period ( P ). In 13b is the bottom board (compared to 13a) by 1/2 period ( 1 / 2 P ) laterally displaced, whereby the V-shaped bulge ( 14 ) is shown only offset by 1/2 P and by the contact edge ( 18a ) the required support of the two adjacent boards according to the profile arrangement A ( 14c ) is possible. Without this contact edge ( 18a ) would be the superimposition of the profiles, as in 13b (below) and 14b to d (shown below), hardly possible.

The V-shaped bulges can also have an arcuate shape (16) (U-shape) ( 11b) ,

Mutual support ( 13 ) of the superimposed profiles is also achieved by the (in otherwise synchronous (8, 9) running) zigzag profile in every second level the break point 12 ) by 1 or 1/2 period ( P ) is moved ( 10b, c ).

Due to the support (with this kink point offset) 13 ) the arrangement of the "house roof profile" in this way A possible as they are in 10b, c (shown below). The superimposed boards are (compared to the representation in 10a and 1a) shifted laterally by 1/2 P.

LIST OF REFERENCE NUMBERS

1

Heat exchanger board with house roof profile - one above the other ( 1 . 2 )

2, 2 '

Heat exchanger board with house roof profile ( 1 . 2 . 13a)

3

tip pointing outwards (below) ( 1a . 4 )

3a, 3e

tip pointing inwards ( 3a . 3b)

3c

Triangle (tip up) ( 1d )

3d

sloping wall (for house roof shape) ( 2 )

4

tip pointing outwards (top) (house roof) ( 1b)

4a

narrow flow cross section in the angular range ( 4b, c )

5

Horizontal in profile ( 1 to 4 )

5a

Rounding at corners ( 5a)

5b

Flattening at corners ( 5b)

5c

Ride on superimposed boards with neighboring synchronous profile shape A ( 8a)

6

zigzag-shaped (-like) course of the profile structure ( 6a . 8th . 9 )

7

sinusoidal profile of the profile structure ( 7 )

8, 9

synchronous profile for the superimposed boards ( 1 . 2 ) ( 8th )

10

cross-shaped profile for the superimposed boards ( 9 )

11

Crossing point, support edge when the profile is superimposed ( 10 ) ( 9 )

12

Kink point (corner) with zigzag profile on top of each other ( 8th . 9 ) by one period ( P ) offset ( 10 )

13

Crossing point, support edge when the profile is superimposed ( 10b, c )

14

V-shaped bulge with (otherwise) straight profile ( 11a and 13 )

15

V-shaped bulge (or U-shaped) bulge (like ( 14 )), in the neighboring profile level, mirrored (right / left) offset ( 14c )

16

Rounding at the U-shaped bulge, arched (U-shape) ( 11b)

17

V-shaped (or U-shaped) bulge with a zigzag profile profile ( 12 )

18

straight profile (without bulge) ( 13 )

18a

Crossing point (contact edge) of the bulge to the profile in the adjacent profile plane ( 13 . 14 )

19

V-shaped or U-shaped bulge (like ( 14 )) in the neighboring profile level, mirrored right / left and by the distance Y is offset ( 14d )

20

slim profile ( 15 )

21

Profile structure running transversely (from left to right - and upside down) across the width of the profiled board - state of the art ( 16 )

22

Crossing point - flow "drills" into the adjacent flow channel ( 16c )

A

Profile arrangement, the adjacent board assuming the same (synchronous) profile shape ( 9 . 10c . 14c )

e

Part of the flow cross-section that lies in the rear area with a greater profile depth ( 9 . 15 )

L

Section for a safe ride with a profile arrangement ( A ) ( 8a)

P

a period ( 1a . 1c . 10 . 13 )

R

Edge area of the profiled board ( 6b) with loss of area in the upright profile

R1

Deflection point for the flow into the adjacent flow channel (in the edge area) ( 16c )

X, Y

Distance of the bulges of the neighboring profile planes ( 14 )

H

Profile height ( 15 )

α, β

external angles of the triangle or the "pointed roof shape" ( 1c . 4a)

γ

included angle of the triangle or the "pointed roof shape" ( 1c . 4a)

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 10329153 [0002]
• DD 243088 [0002]
• DE 4333904 [0002, 0014]
• DE 29916493 [0004, 0013]
• DE 29824920 [0004, 0013]
• DD 243091 [0014]

Claims (9)

Heat exchanger consisting of profiled heat exchangers arranged one above the other, the plates arranged one above the other forming parallel flow channels due to their meandering course and the plates being shaped by a rectangular structure, characterized in that in each case one horizontal side (either the lower (3, 3b) or the upper one (3c, 4)) is designed as a tip (3, 3b, 3c) or inside (3a) pointing (3, 4 - like a house roof) or as a triangle (3b, 3c) and this tip ( or triangle) is on a horizontal (5) or adjacent board. Instead of this horizontal line, an inwardly pointing tip (3e) can also be placed. The roof-shaped profile can also be provided with an oblique wall (3d). Heat exchanger after Claim 1 , characterized in that the bilateral angles of the tip (3, 4) or of the triangle (3b, 3c) can be the same (a = β) or different. Heat exchanger with profiles according to Claim 1 to 2 , characterized by a seat (5c), which results in a section L as limited as possible by a predominantly vertical edge in the profile, whereby the profile arrangement (A) is possible in which the respectively adjacent circuit board assumes the same (synchronous) shape. Heat exchanger after Claim 1 to 3 , characterized in that the corners of the profiles are alternatively rounded (5a) or flattened (5b) to improve the deep-drawing ability. Heat exchanger after Claim 1 to 4 , characterized in that the profile structure takes a zigzag (6) or sine curve-like (7) course when viewed in the direction of flow, the profile structures running essentially synchronously (8, 9) in all superimposed boards or the profile structures crossing from board to board (11 ) and thus rest on support edges (11), or the profile structure of two adjacent boards runs synchronously - the adjacent pair of profiles then has a crosswise pattern of the zigzag structure to the first pair. Due to the support edges (11) it is possible that the profile of the adjacent board next to the in Claim 1 mentioned arrangement (pointed edge (3, 4)) is on a flat surface (5) also the profile arrangement (A) allowed. Heat exchanger after Claim 1 to 5 , characterized in that the profile structure takes a zigzag (6) or sine curve-like (F) course when viewed in the direction of flow, the profile structures running essentially synchronously in all superimposed boards, but with the break points at every other position (plane) at the break points (12) are offset by 1 or 1/2 periods (P), which results in crossing points or support edges (13). The profile arrangement (A) is also possible due to the support edges (13). Heat exchanger after Claim 1 to 6 , characterized in that the profile structure , viewed in the direction of flow, takes a V-shaped bulge (14, 17), both with (otherwise) a straight profile profile (14) and with the zigzag profile (6, 17). The V-shaped bulges can also be rounded (16) at the edges (U-shape). Heat exchanger after Claim 1 to 7 , characterized in that the V-shaped (U-shaped) bulge is realized in the superimposed boards only in every second plane and in the other plane the profile runs straight (18), whereby a crossing point (18a) or contact edge results. The profile edge (A) is also possible due to the contact edge (18a). Heat exchanger after Claim 1 to 8th , characterized in that the V- (U) -shaped bulges in the superimposed boards a) lie in the same shape (14) one above the other or b) are offset by the distance X from the adjacent board or c) offset in mirror image (right / left) ( 15) or d) the bulge (19) is mirrored on the right / left and is offset by the distance Y (a combination of b) and c)). The above-mentioned variants b) to d) result in supporting edges (18a) on the superposed boards, on which the profiles lie against one another. The profile arrangement (A) is also possible due to the support edges (18a).

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