CN101995172B - Micro-channel heat exchanger and equipment using same - Google Patents

Micro-channel heat exchanger and equipment using same Download PDF

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Publication number
CN101995172B
CN101995172B CN 201010528364 CN201010528364A CN101995172B CN 101995172 B CN101995172 B CN 101995172B CN 201010528364 CN201010528364 CN 201010528364 CN 201010528364 A CN201010528364 A CN 201010528364A CN 101995172 B CN101995172 B CN 101995172B
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China
Prior art keywords
water guide
heat exchanger
guide plate
water
flat
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CN 201010528364
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CN101995172A (en
Inventor
张杰山
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XINXIANG LONGTENG REFRIGERATION TECHNOLOGY CO LTD
Golden Dragon Precise Copper Tube Group Inc
Original Assignee
SHANGHAI GOLDEN DRAGON REFRIGERATION Tech CO Ltd
Golden Dragon Precise Copper Tube Group Inc
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Application filed by SHANGHAI GOLDEN DRAGON REFRIGERATION Tech CO Ltd, Golden Dragon Precise Copper Tube Group Inc filed Critical SHANGHAI GOLDEN DRAGON REFRIGERATION Tech CO Ltd
Priority to CN 201010528364 priority Critical patent/CN101995172B/en
Priority to PCT/CN2010/001808 priority patent/WO2012058791A1/en
Publication of CN101995172A publication Critical patent/CN101995172A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F17/00Removing ice or water from heat-exchange apparatus
    • F28F17/005Means for draining condensates from heat exchangers, e.g. from evaporators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366Assemblies of conduits connected to common headers, e.g. core type radiators

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention relates to a micro-channel heat exchanger. The micro-channel heat exchanger comprises a plurality of flat pipes which are arranged parallelly along a direction vertical to the ventilation direction, and hollow collecting pipes which are arranged at the two ends of each flat pipe, wherein a heat exchange medium channel is formed in each flat pipe; the ends of the flat pipes are inserted into the hollow collecting pipes; the heat exchange medium channels of the flat pipes are communicated with hollow channels of the hollow collecting pipes; a water guide plate or a water guide sheet is arranged between two adjacent flat pipes and provided with a condensed water flow channel; and a ripple fin is arranged between the water guide plate or the water guide sheet and the adjacent flat pipe. The micro-channel heat exchanger can obviously improve the drainage effect. The invention also provides equipment using the micro-channel heat exchanger.

Description

Micro-channel heat exchanger and equipment applying same
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a micro-channel heat exchanger. The invention also relates to equipment using the micro-channel heat exchanger, such as an air-cooled air conditioner or a heat pump machine.
Background
In an air-cooled air conditioning system, when a heat exchanger is used for an evaporator, water vapor in air can be condensed on the surface of the heat exchanger, and the condensed water is gathered to a certain extent, so that the heat transfer performance of the heat exchanger can be reduced, the wind resistance can be increased, and the phenomenon of water dripping of the air conditioner can be caused. When the heat exchanger is used for an outdoor unit of a heat pump machine, water condensation or frost formation can also occur on the surface of the outdoor heat exchanger under the heating working condition. When the frost is formed to a certain degree, the air conditioner needs to start a defrosting mode, the frost of the outdoor heat exchanger is melted, the melted water also needs to be discharged in time, otherwise, the frost is condensed again, and the frost formation degree is increased. As can be seen, both the evaporator of the air-cooled air conditioning system and the outdoor unit of the heat pump type air conditioner are required to have good drainage performance.
When a typical microchannel heat exchanger is used for a heat exchanger of an air conditioning system at present, if drainage of the heat exchanger is involved, a flat pipe of the heat exchanger needs to be vertically placed, and condensate water needs to be drained in a mode of flowing downwards from gaps of window-opening fins. FIG. 1 is a schematic diagram of a typical microchannel heat exchanger of the prior art; fig. 2 is a partial schematic view of fig. 1 for explaining a drainage manner thereof. Referring to fig. 1 and 2, the microchannel heat exchanger mainly comprises the following components and manners: arrange the parallel flat pipe 1 of multirow along the perpendicular to ventilation direction, be provided with the passageway of heat exchange medium (also called refrigerant) circulation in the flat pipe 1, weld ripple windowing fin 2 between adjacent flat pipe 1. The two ends of the flat pipe 1 are inserted into the hollow collecting pipes 3, the two collecting pipes 3 are respectively connected with an inlet pipe 4 and an outlet pipe 5, and an edge pipe 6 is arranged outside the flat pipe 1 on the outermost side and used for protecting the heat exchanger. When the heat exchanger is placed, the flat pipe 1 is kept vertical, and when water is drained, condensed water flows downwards vertically from gaps of the corrugated windowing fins 2, so that the purpose of draining water is achieved.
However, in the heat exchanger shown in fig. 1 and 2, since the drainage is performed along the window gaps, the condensed water on the upper fins is required to flow through the windows of each lower fin in sequence, which makes the drainage very difficult. And most surfaces of the fins are coated by thick condensed water, so that the heat exchange performance is reduced, and the air resistance is increased. Due to poor drainage, microchannel heat exchangers are less useful in evaporators or heat pump outdoor heat exchangers, which limits the range of applications for microchannel heat exchangers. Drainage of microchannel heat exchangers is a problem that is urgently needed to be solved at present.
In the US patent document US64399300B1, a microchannel heat exchanger is disclosed, which also consists of parallel flat tubes and fins, the spacing between adjacent flat tubes being c, the fins having a very small root inner radius r, the length of the fin fenestration being l; it satisfies the following relationships, 0 r/c < 0.057, 0.89 l/c < 1.01 and 0.29 p/c < 0.43. However, the fins in the form still need to drain water from the windowing gaps of the corrugated fins, and are still limited by the structure of the corrugated fins, and the drainage effect is not substantially improved.
Chinese patent publication No. CN1504699A discloses a microchannel heat exchanger in which corrugated fins have their corrugated groove lines and ridge lines inclined in the inward direction of the heat exchanger, and the fins are at a certain angle to the horizontal direction, thereby improving the drainage of the heat exchanger. However, the fins in the form are very difficult to machine and difficult to use in a batch manner for heat exchangers.
Disclosure of Invention
The invention provides a micro-channel heat exchanger, which aims to solve the problem that condensed water in the existing micro-channel heat exchanger is not smoothly discharged. The invention further provides equipment applying the micro-channel heat exchanger, such as an air-cooled air conditioner or a heat pump machine.
The invention provides a micro-channel heat exchanger which comprises a plurality of flat pipes arranged in parallel along a direction vertical to a ventilation direction and hollow collecting pipes arranged at two ends of the flat pipes; a heat exchange medium channel is arranged inside each flat pipe, two ends of each flat pipe are inserted into the hollow collecting pipe, and the heat exchange medium channel of each flat pipe is communicated with the hollow channel of the hollow collecting pipe; wherein,
a water guide plate or a water guide sheet is also arranged between the two adjacent flat tubes, and a condensed water flowing channel is arranged on the water guide plate or the water guide sheet;
corrugated fins are arranged between the water guide plate or the water guide sheet and the adjacent flat tubes; an included angle between the corrugated fin and the water guide plate or the water guide sheet is an acute angle; the corrugated fins are provided with ventilation windows and are called windowing fins;
the hollow collecting pipe at one end is used for distributing heat exchange media to each flat pipe, and the hollow collecting pipe at the other end is used for collecting the heat exchange media flowing through each flat pipe.
Optionally, the water guide plate or the water guide sheet is arranged in parallel to the flat pipe.
Optionally, the width of the water guide plate or the water guide sheet in the ventilation direction is smaller than, larger than or equal to the width of the flat tube.
Optionally, a sharp-angled protrusion is arranged on the outer surface of the water guide plate or the water guide sheet.
Optionally, a plurality of water guide plates or water guide sheets are arranged between the adjacent flat tubes along the ventilation direction, and a gap is arranged between the adjacent water guide sheets or water guide plates to serve as the condensed water flowing channel.
Optionally, the water guide plate or the water guide sheet is of a combined structure of one or more than two sheets.
Optionally, the cross section of the water guide plate or the water guide sheet along the ventilation direction is in a triangular corrugated shape, an arc corrugated shape or a trapezoidal corrugated shape, and the formed corrugated groove is used as a condensed water flow channel.
Optionally, when a water guide plate is arranged between two adjacent flat tubes, the water guide plate is a hollow plate, and a drain hole is formed in the surface of the hollow plate, which is in contact with the corrugated fin.
Optionally, the shape of the drainage hole is circular, oval, square or rectangular with the long side along the vertical direction.
In addition, the invention also provides air conditioning equipment comprising any one of the micro-channel heat exchangers.
Optionally, the apparatus is an air-cooled air conditioner or a heat pump type air conditioner.
Compared with the prior art, one aspect of the invention has the following advantages: a water guide sheet or a water guide plate is arranged between two adjacent flat tubes of the micro-channel heat exchanger and is connected with the fins; in the working process, condensed condensate water is collected to the position of the water guide sheet or the water guide plate under the action of gravity and slides downwards from the water guide sheet (or the water guide plate) or a gap between the water guide sheet (or the water guide plate) and the fin to drain water; compared with the existing heat exchanger, the heat exchanger can obviously improve the drainage effect; in addition, the water guide sheet (or the water guide plate) simultaneously plays a role in increasing the heat exchange area, and can enhance the heat exchange effect of the heat exchanger; moreover, each part of the microchannel heat exchanger has simple structure and is easy to process; the heat exchanger has simple integral structure and is easy to produce in batches.
Drawings
FIG. 1 is a schematic diagram of a typical microchannel heat exchanger of the prior art;
FIG. 2 is a partial schematic view of FIG. 1 illustrating the manner in which water is drained;
FIG. 3 is a schematic structural view of an embodiment of the microchannel heat exchanger of the present invention;
FIG. 4 is a partial schematic view of FIG. 3 illustrating the manner in which water is drained;
FIG. 5 is a partial schematic view of a microchannel heat exchanger with corrugated water guide sheets or plates;
FIG. 6 is a schematic cross-sectional view of a triangular corrugated water guide sheet or plate;
FIG. 7 is a schematic cross-sectional view of an arc-shaped corrugated water guide sheet or plate;
FIG. 8 is a schematic cross-sectional view of a trapezoidal corrugated water guide sheet or plate;
FIG. 9 is a schematic view of a partial structure of a microchannel heat exchanger with combined water guide plates or plates;
fig. 10 is a partial schematic structural view of a microchannel heat exchanger with a hollow water guide plate.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather construed as limited to the embodiments set forth herein.
The microchannel heat exchanger of the present invention will be described with reference to the accompanying drawings.
Fig. 3 is a schematic structural view of an embodiment of the microchannel heat exchanger according to the present invention, and fig. 4 is a partial view of fig. 3 for explaining a drainage manner thereof.
Referring to fig. 3, in the embodiment of the present invention, the microchannel heat exchanger includes a flat tube 1, a corrugated fin 8, a water guide sheet or a water guide plate 7, a hollow collecting pipe 3, a water inlet pipe 4, a water outlet pipe 5, and a side plate 6.
Wherein, the flat pipe 1 is plural. A hollow channel is provided in each flat tube 1. The passage is used for flowing a heat exchange medium such as a refrigerant (also referred to as a refrigerant), and is referred to as a heat exchange medium passage. The flat tubes 1 are arranged in parallel along a direction perpendicular to the ventilation direction, and a certain distance is arranged between adjacent flat tubes and used for arranging the water guide sheet or the water guide plate 7 and the corrugated fin 8 and ventilating. So that the heat exchange medium can exchange heat with the outside air when flowing through the flat tubes 1.
In the use state, the flat tube 1 is generally vertically arranged. All flat tubes 1 have the same or approximately the same height and width.
The number of the hollow collecting pipes 3 is two, and the two hollow collecting pipes are respectively arranged at two ends of the flat pipe 1. The hollow collecting pipe 3 is internally provided with a hollow channel for distributing heat exchange media to the flat pipe 1 and collecting the heat exchange media flowing through the flat pipe 1. The hollow headers 3 at both ends function as the above-mentioned distributing or collecting, respectively, according to the flow direction of the heat exchange medium. The end part of each flat pipe 1 is inserted into the hollow collecting pipe 3, so that the heat exchange medium channel in the flat pipe 1 is communicated with the hollow channel of the hollow collecting pipe 3.
The corrugated fin 8 is used for increasing the heat exchange area of the air side and improving the heat exchange performance of the heat exchanger. In particular, in the embodiment of the present invention, it also has a function of accelerating drainage. The corrugated fin 8 may be any structure known in the art, and a structure facilitating the flow of the condensed water, such as a louver, may be provided on the corrugated fin 8. This will not be described in detail here.
The water guide sheet or the water guide plate 7 is arranged between the two adjacent flat tubes 1, and the water guide sheet or the water guide plate 7 is arranged between every two adjacent flat tubes 1. The water guide plate or the water guide sheet 7 can be arranged in parallel with the flat pipe. The width of the water guide plate or the water guide sheet 7 in the ventilation direction can be smaller than or equal to the width of the flat pipe.
Corrugated fins 8 are arranged between each water guide sheet or water guide plate 7 and the adjacent flat tubes. The corrugated fin 8 can be fixed at two ends thereof on the flat tube 1 and the water guide sheet or the water guide plate 7 in a welding manner. So that the corrugated fins 8, the water guide fins or water guide plates 7 and the flat tubes 1 are referred to as a whole. A condensed water flowing channel is arranged on the water guide sheet or the water guide plate 7, and the main function of the condensed water flowing channel is to guide the condensed water.
Furthermore, in the embodiment of the microchannel heat exchanger according to the present invention, an inlet pipe 4 and an outlet pipe 5 are further provided on the hollow collecting main. During operation, heat exchange medium is introduced into the hollow collecting pipe 3 through the inlet pipe 4, passes through the flat pipe 1, is collected through the hollow collecting pipe 3 at the other end part, and is led out of the heat exchanger through the outlet pipe 5. In addition, in order to avoid damage, an edge plate 6 is also provided on the outer side of the flat tube 1 provided on the edge, for protecting the heat exchanger.
FIG. 4 is an enlarged schematic view of a portion of the embodiment of the microchannel heat exchanger shown in FIG. 3. Referring to fig. 4, during the operation, the condensed water is condensed on the surfaces of the flat tubes 1 and the corrugated fins 8, and due to the action of gravity, the condensed water slides down along the corrugated fins 8, and finally collects on the water guide sheet or the water guide plate 7, and flows down along the condensed water flow channel on the water guide sheet or the water guide plate 7, and finally is discharged out of the heat exchanger.
Because each corrugated fin 8 is contacted with the water guide sheet or the water guide plate 7, in the process that condensed water flows downwards along a condensed water flow channel of the water guide sheet or the water guide plate 7, the condensed water at the root part of each corrugated fin 8 connected with the water guide sheet or the water guide plate 7 can be adhered away under the action of viscous force, thereby achieving the effect of accelerating drainage.
In addition, in order to ensure that the condensed water can flow to the water guide sheet or the water guide plate 7 along the surface of the corrugated fin 8, an included angle between the corrugated fin 8 and the water guide sheet or the water guide plate 7 is set to be an upward acute angle, and in order to increase the drainage effect, the angle of the acute angle can be adjusted to be as small as possible.
In addition, in order to further increase the drainage effect, a plurality of protrusions with sharp corners can be arranged on the outer surface of the water guide sheet or the water guide plate 7, so that the sharp corners of the protrusions can pierce a liquid film of the condensed water in the flowing process of the condensed water, and the adhesive force on the surface of the water guide sheet or the water guide plate 7 is reduced.
The water guide sheet or water guide plate 7 in the above-described embodiments may have various forms, which will be described in detail below.
Fig. 5 is a partial schematic view of a microchannel heat exchanger with corrugated water guide sheets or plates.
Referring to fig. 5, the cross section of the water guide plate 7-2 along the ventilation direction is corrugated, and the grooves and the protrusions which are vertically downward along the vertical direction are called as corrugated water guide plates or water guide plates 7-2. The groove is used as a condensed water flow channel, and the bulge can be arranged to be in a pointed prism shape and used for puncturing a liquid film, so that the drainage capacity is improved.
Fig. 6, 7 and 8 are schematic cross-sectional views of a triangular corrugated water guiding sheet or water guiding plate, an arc-shaped corrugated water guiding sheet or water guiding plate and a trapezoidal corrugated water guiding sheet or water guiding plate, respectively. The trapezoidal corrugated water guide plate or water guide sheet comprises a flat section (namely a trapezoidal bottom) and an inclined section (namely a trapezoidal waist), and the flat section and the corrugated fin 8 (see fig. 3) can be welded during welding, so that the contact area between the water guide sheet or water guide plate and the corrugated fin 8 is increased, the overall strength and rigidity of the microchannel heat exchanger are improved, the thermal resistance between the water guide sheet or water guide plate and the corrugated fin 8 is reduced, and the heat exchange effect is enhanced. In the trapezoidal corrugated water guide sheet or the water guide plate, the channel with the trapezoidal outline is a condensed water flowing channel.
Another water deflector or sheet is shown in fig. 9. Referring to fig. 9, two (or more) water guide plates or water guide sheets 7-1 are disposed along the ventilation direction, and a gap is disposed between adjacent water guide plates or water guide sheets 7-1, and the gap serves as a flow channel for condensed water. Furthermore, each water guide plate or water guide sheet 7-1 is a multi-sheet combined structure.
Fig. 10 is a partial schematic structural view of a microchannel heat exchanger with a hollow water guide plate. Referring to fig. 10, the water guide plate 7-3 is a hollow plate, a water drainage hole 7-4 is formed in a surface of the hollow plate 7-3 contacting the corrugated fin 8, the water drainage hole 7-4 is communicated with the hollow channel of the hollow tube 7-3, so that the condensed water on the corrugated fin 8 can flow into the inner channel of the hollow tube 7-3 through the water drainage hole 7-4 and be drained along the inner channel, and the hollow channel of the hollow tube 7-3 serves as a condensed water flow channel. The shape of the drain hole is round, oval, square or rectangle with long edge along vertical direction. The case of a rectangle is shown in fig. 10.
The water deflector or sheet 7 may also have other structures, which are not described one by one, and those skilled in the art can derive corresponding modifications according to the teachings of the present specification. However, any structure that is disposed between two adjacent flat tubes 1, connects all corrugated fins between the adjacent flat tubes, and has a drainage function should be included in the scope of the present invention.
The microchannel heat exchanger of the invention can be applied to air conditioning equipment, such as an air-cooled air conditioner or a heat pump type air conditioner. The air conditioning equipment applied to the micro-channel heat exchanger has good drainage effect
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto, and variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims (11)

1. A micro-channel heat exchanger is characterized by comprising a plurality of flat pipes which are arranged in parallel along the direction vertical to the ventilation direction and hollow collecting pipes which are arranged at the two ends of the flat pipes; a heat exchange medium channel is arranged inside each flat pipe, two ends of each flat pipe are inserted into the hollow collecting pipe, and the heat exchange medium channel of each flat pipe is communicated with the hollow channel of the hollow collecting pipe; wherein,
a water guide plate is arranged between two adjacent flat tubes, and a condensed water flowing channel is arranged on the water guide plate;
corrugated fins are arranged between the water guide plate and the adjacent flat tubes; an included angle between the corrugated fin and the water guide plate is an upward acute angle; the corrugated fins are provided with ventilation windows and are called windowing fins;
the hollow collecting pipe at one end is used for distributing heat exchange media to each flat pipe, and the hollow collecting pipe at the other end is used for collecting the heat exchange media flowing through each flat pipe.
2. The microchannel heat exchanger of claim 1, wherein the water deflector is disposed parallel to the flat tube.
3. The microchannel heat exchanger of claim 1, wherein the width of the water deflector in the ventilation direction is less than or equal to the width of the flat tube.
4. The microchannel heat exchanger of claim 1, wherein a pointed protrusion is provided on an outer surface of the water guide plate.
5. The microchannel heat exchanger according to any one of claims 1 to 4, wherein a plurality of water deflectors are arranged between adjacent flat tubes in the ventilation direction, and gaps are provided between adjacent water deflectors as the condensed water flow channels.
6. The microchannel heat exchanger according to any one of claims 1 to 4, wherein the water guide plate has a combined structure of one or more than two pieces.
7. The microchannel heat exchanger according to any one of claims 1 to 4, wherein the cross section of the water guide plate in the ventilation direction is triangular corrugated, arc corrugated or trapezoidal corrugated, and the formed corrugated grooves are used as the condensed water flow channels.
8. The microchannel heat exchanger according to any one of claims 1 to 4, wherein the water guide plate is a hollow plate, and a drain hole is formed on a surface of the hollow plate contacting the corrugated fin.
9. The microchannel heat exchanger of claim 8, wherein the drain hole has a shape of a circle, an ellipse, a square, or a rectangle having a long side in a vertical direction.
10. An air conditioning apparatus comprising the microchannel heat exchanger of any one of claims 1 to 9.
11. The apparatus of claim 10, wherein the apparatus is an air-cooled air conditioner or a heat pump type air conditioner.
CN 201010528364 2010-11-02 2010-11-02 Micro-channel heat exchanger and equipment using same Active CN101995172B (en)

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PCT/CN2010/001808 WO2012058791A1 (en) 2010-11-02 2010-11-11 Micro-channel heat exchanger and device using it

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CN101995172B true CN101995172B (en) 2013-01-02

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