KR102228486B1 - Micro channel based heat exchanger - Google Patents

Abstract

The present invention relates to a micro-groove tube and micro-channel or multi-port based aluminum for heat exchange or heat recovery, in refrigeration systems or heat pump systems, in particular systems such as condensers or evaporators within such systems. It relates to the heat exchanger. The heat exchanger comprises, as well as micro-channel or multi-port extrudates, serpentine pins 9 attached to the extrudates 7 and 8 and an inlet and outlet manifold collector/distributor 15 connected to the extrudates. do. The serpentine pins 9 are provided in the transverse direction with respect to the extrudates 7 and 8 and their side edges 10 and 11 lie perpendicular to the extrudates 7 and 8. The extrudates are a web type extrudate or MPE 5, also referred to as web-MPE 12, having individual ports or microchannels 13 interconnected with thinner flanges or webs 14 It may be a Multi-Port Extrusion, also referred to as a Multi-Port Extrusion.

Description

Micro channel based heat exchanger{MICRO CHANNEL BASED HEAT EXCHANGER}

The present invention relates to a heat exchanger based on microchannel (multiple ports) for heat exchange or heat recovery, in refrigeration systems or heat pump systems, in particular systems such as condensers or evaporators within such systems.

Micro-channel type heat exchangers based on multiport extrusion (MPE) profiles of aluminum are also used in the longitudinal direction of extruded tubes or channels with serpentine fins of aluminum and between the extruded tubes or channels. It is known to be provided in.

Pins are usually brazed to contours at their elbow outer faces (as can be seen in the attached figure 1).

Heat exchangers of this type are known, for example, from Japanese Laid-Open Publication No. 3-13794.

A limitation of this known heat exchanger is the poor drainage of water that condenses on the outer surfaces of the heat exchanger.

In accordance with the present invention, the following improved heat exchanger fin arrangement and design is provided:

-Utilizing the benefits of MPE production technology.

-More tubes in one extrudate.

-Fewer parts in the heat exchanger.

-Allows for better surface balance (optimization) between the refrigerant side and the air side of the heat exchanger.

-Can utilize the concept of continuous pins.

-Improved condensate drainage from MPE type heat exchanger.

-More robust fins on the heat exchanger air inlet and outlet.

-A more rational heat exchanger assembly process.

-Can be used with new web-MPE design (see definition later).

The invention is characterized by features as defined in the appended independent claim 1.

Preferred embodiments of the invention are further defined in dependent claims 2 to 8.

The invention will be described in further detail through the examples that follow and with reference to the accompanying drawings.
1 is a perspective view of a portion of a conventionally known MPE based heat exchanger having a serpentine fin assembly,
2 is a perspective view showing a part of an MPE-based heat exchanger having a serpentine fin assembly according to the present invention,
3 shows examples of extruded contours that can be suitably used for connection according to the present invention,
4 shows an enlarged view of an assembly of a portion of a web-MPE based heat exchanger having a serpentine fin assembly according to the present invention,
5 shows an embodiment of an extrudate and fin design according to the invention, with the crests or bends of the fins partially removed,
6 shows a cross-section of the assembly shown in FIG. 5 and how the pins are received into the extrudate and brazed to the extrudate,
Figure 7 shows an alternative embodiment of the invention, in which the pins are provided to have a "louvre" design,
8 is an illustration of different louver and air flow designs,
9 shows an alternative serpentine pin reinforcement design,
10 shows another serpentine fin design with an optimized reduction in heat transfer in the air flow direction,
11 shows an embodiment of a web-MPE design with an optimized brazing flange,
12 shows another alternative web-MPE design in which a portion of the web material between the ports or tubes of the extrudate is removed,
13A is a perspective view of a portion of a fin and tube embodiment showing a modification with improved bonding/brazing properties and FIG. 13B is a cross-sectional view thereof.

As stated above, FIG. 1 shows in perspective a portion of a commonly known MPE based heat exchanger having a serpentine fin assembly. As can be seen from the drawing, the serpentine fin 2 of the heat exchanger is provided in a longitudinally standing state between the plurality of tube extrudates 3 and 4 and is It is attached to the extrudates on the outer surface of the top or bend 5. A heat exchanger of this type typically consists of a plurality of extrudates 3 with fins 2 and (overlapping) extrudates 3, 4, depending on the size and heat exchange capacity of the heat exchanger.

FIG. 2 shows a view, in which serpentine pins 9 are provided in the transverse direction with respect to the extrudates 7 and 8 and their sharp edges 10 and 11 lie perpendicular to the extrudates 7 and 8 Shows a part of a heat exchanger according to the invention. In addition to the known horizontal, standing version shown in Fig. 1, the heat exchanger according to the invention as shown in Fig. 2, depending on the heat exchange capacity and size of the heat exchanger, the fins 9 It may consist of one, few, or multiple extrudates 3, 4 (see corresponding Fig. 1), parallel to the "layers" of. As can be seen from the figure (see also the subsequent figures), the bends of the pins 9 may extend beyond the side edges of the extrudates 7 and 8.

Figure 3 shows examples of extruded contours that can be suitably used for the connection according to the invention, i.e., as mentioned above and shown in Figures 1 and 2, also referred to as MPEs 5, 7, 8, conventional Web type extrudate with multi-port (or channel) extrudate and "individual" tubes or fine channels 13 interconnected with thinner flanges or webs 14 referred to hereinafter as web-MPE Is shown.

4 shows an enlarged view of an assembly of a portion of a web-MPE 12 based heat exchanger having a serpentine fin 16 assembly according to the present invention including a manifold 15. Heat exchangers of this type are typically provided with two manifolds, namely an inlet manifold and an outlet manifold, and thus showing only one manifold 15 is only an example. Figure 4 also shows the direction of the refrigerant flowing in the web-MPE microports or tubes 17, individually in the transverse direction of the web-MPE 12, but in parallel with the serpentine fins 16 of the heat exchanger. The direction of the air flowing from the outside is shown by arrows.

5 shows an embodiment of a web type extrudate 12 and pin 18 design according to the invention, with the tops or bends of the pins cut and partially removed at positions 19 and 20, respectively. do. This is done to improve and improve air flow through the fins.

6 further shows a cross-section of a similar assembly as shown in FIG. 5. As can be seen in this figure, a portion of the material of the fins 18 is removed and thereby, the fins 18 are essentially the entire outer surface (including the tube 17) by the brazing part 21. It is fitted to the flange or web 14 of the extruded contour so that it can be connected to the extruded contour along the web 14]. This will improve the connection between the fins and the extrudates and improve heat transfer between the extruded contour and the fins. However, an alternative embodiment may be made to connect the fins only to the tubes, as indicated in FIG. 5.

Figure 7 is an alternative embodiment of the present invention in which serpentine fins 22 are provided with a "louvre" design to enhance convection of heat from the fins to air or back (depending on the application). Shows. The fins 22 are provided with vertical slits, wherein the metal along the slits is designed to draw air to create transverse barbs 23, which are designed to draw air and direct air through the openings created in the fin. It is compressed inward or outward. This is further illustrated in FIG. 8 showing different louver and air flow designs. The tops or bends of the serpentine pins may be open or closed as shown in the figure.

In accordance with the present invention, other fin designs may also be possible as shown in FIG. 9 in which the fins are provided in a longitudinal 25 or transverse 24 wave-like design. Other designs may also be possible, such as a herringbone pattern.

10 shows a design in which one or more heat transfer separation zones 31 may be punched into the fin. A similar design is used in the deeper F&T heat exchanger design to suppress heat transfer in the direction of air flow.

11 shows outwardly protruding flanges 27 in which the ports or tubes of the extrudates 26 not only improve the brazing connection between the fins and the extrudates, but also aid in heat transfer between the fins and the extrudates. Shows an alternative web-MPE design, provided to have.

12 shows an extrudate web design in which some of the material of the webs 29 is removed to enable drainage between the tubes and to reduce heat transfer in the transverse direction of the tubes when necessary. As the web material is further removed, the heat transfer is correspondingly also reduced. This design could be used to optimize heat transfer.

13A is a perspective view of a portion of a fin and tube embodiment showing a modification with improved bonding/brazing properties and FIG. 13B is a cross-sectional view thereof.

13A further shows a perspective view of a portion of the fin 30 and tube 31 embodiment, with the lower portion 32 of the fins bent outward to improve bonding or brazing (attachment) of the fin to the tubes. And Fig. 13B is a cross-sectional view thereof.

The invention as defined in the claims is not limited in scope by the examples described above and shown in the drawings. Thus, the heat exchanger can be used not only as a condenser or evaporator in a refrigeration system, but also in any system in which heat is exchanged and recovered. Furthermore, expressions such as multiple tubes as defined in the claims may include single or multiple tube extrusion contours made of aluminum.

Claims (8)

In a refrigeration system or heat pump system, including multiple port extrudates, serpentine fins 9 attached to the extrudates 7 and 8 and an inlet and discharge manifold 15 attached to the extrudates. As a multi-port based aluminum heat exchanger for heat exchange or heat recovery of,
The serpentine fins 9 are provided in a transverse direction with respect to the extrudates 7 and 8, and the side edges 10 and 11 of the serpentine fins are with respect to the extrudates 7 and 8 Placed vertically,
The extrudate has a web-MPE structure,
In order to improve the drainage of the condensate and to control and reduce the transverse heat transfer of the ports, part of the material of the webs 14 between the ports is removed,
Heat exchanger, characterized in that the tops or bends of the serpentine fins (18) are cut and partially removed at the side edge regions of the fins to improve air flow through the fins. delete The method of claim 1,
The serpentine fins 22 are provided to have a "louvre" structure to improve convection of heat from the fins to air or vice versa, depending on the application, for which the fins 22 are vertical Characterized in that the metal is compressed inward or outwardly along the slits to create transverse barbs 23 designed to take air out and direct air through openings created in the pin. heat exchanger. The method of claim 1,
Heat exchanger, characterized in that the fins are provided in a longitudinal (25) or transverse (24) wave-like structure. The method of claim 1,
Heat exchanger, characterized in that the fins are attached to the extrudates by brazing. The method of claim 1,
Heat exchanger, characterized in that the fins are attached to the extrudates by bonding. delete delete

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