CN111336841A - Enclosed stack type micro-channel heat exchanger - Google Patents

Enclosed stack type micro-channel heat exchanger Download PDF

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Publication number
CN111336841A
CN111336841A CN202010090943.3A CN202010090943A CN111336841A CN 111336841 A CN111336841 A CN 111336841A CN 202010090943 A CN202010090943 A CN 202010090943A CN 111336841 A CN111336841 A CN 111336841A
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CN
China
Prior art keywords
heat exchange
microchannel heat
micro
fluid
liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010090943.3A
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Chinese (zh)
Inventor
周文杰
虞寿仁
虞忠卫
金火权
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Hangzhou Dianzi University
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Hangzhou Dianzi University
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Filing date
Publication date
Application filed by Hangzhou Dianzi University filed Critical Hangzhou Dianzi University
Priority to CN202010090943.3A priority Critical patent/CN111336841A/en
Publication of CN111336841A publication Critical patent/CN111336841A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F28D7/00Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02Header boxes; End plates
    • F28F9/04Arrangements for sealing elements into header boxes or end plates
    • F28F9/16Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding

Abstract

The invention discloses a surrounding type microchannel heat exchanger. The shell of the invention is connected with a liquid inlet pipe and a liquid outlet pipe of a fluid I and a liquid inlet pipe and a liquid outlet pipe of a fluid II. The heat exchanger core comprises a plurality of micro-channel heat exchange units; every microchannel heat exchange unit structure is the same, all includes two collector tubes and many microchannel heat exchange tubes, and two collector tubes are inserted respectively at the both ends of many microchannel heat exchange tubes. The microchannel heat exchange units are divided into two groups, wherein the microchannel heat exchange tubes of one group of microchannel heat exchange units are longitudinally arranged, the microchannel heat exchange tubes of the other group of microchannel heat exchange units are transversely arranged, the microchannel heat exchange units in one group and the microchannel heat exchange units in the other group are arranged in a staggered mode, and all the microchannel heat exchange units are arranged in parallel. The invention provides a heat exchange unit with a plurality of micro-channels arranged in a staggered manner, which has higher heat exchange efficiency, can discharge more micro-channel heat exchange tubes in the same space and enhances the heat exchange effect.

Description

Enclosed stack type micro-channel heat exchanger
Technical Field
The invention belongs to the technical field of heat exchangers, and relates to a surrounding type microchannel heat exchanger which can be widely applied to all heat exchangers with liquid-liquid and liquid-phase change liquid heat exchange.
Background
After the petroleum crisis in the seventies of the last century, energy-saving technology and new energy development have become the key points of research in all countries in the world. Commercial and industrial air conditioning systems typically employ liquid-to-liquid heat exchangers, with plate and shell and tube heat exchangers being the most common. Because the plate heat exchanger is influenced by the structure, the sealing line is too long to bear high pressure, the brazing form is not easy to clean, and the plate heat exchanger is influenced by the die, so that the size change investment is large. The diameter of the pipe of the shell-and-tube heat exchanger is larger, so that the heat exchange area of the unit volume is smaller than that of the micro-channel heat exchanger. The miniaturized plate heat exchanger is not suitable for the heat exchange requirement of large energy. The heat exchanger with high energy, high heat flow density, high flexibility, convenient maintenance, compact structure, light weight and high efficiency is the research direction of the current heat exchanger. Therefore, the enclosed metal round tube heat exchanger has the advantages of compact structure, unit volume and high heat exchange efficiency per unit weight, and can be widely applied to the application occasions of liquid-liquid heat exchange.
Chinese patent publication No. CN203336996U discloses a micro microchannel metal round tube liquid-cooled heat exchanger, in which the heat exchange mechanism is formed by connecting a refrigerant inlet tube and an outlet tube through a microchannel metal round tube, the inner diameter of the micro microchannel metal round tube is between 0.1 mm and 0.4mm, and the whole heat exchange mechanism is arranged in a coolant container. In addition, the invention takes the micro-channel metal round tube as a main heat exchange mechanism, and the liquid flowing outside the tube mainly acts on the fluid in the cooling or heating tube. This configuration is not conducive to high flow rate in-tube flow applications because of the large pressure drop.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a folded micro-channel heat exchanger which is compact in structure, energy-saving, material-saving, high in heat exchange efficiency per unit weight and capable of reducing the filling amount of a refrigerant.
The invention comprises a shell, wherein a fluid inlet pipe I, a fluid outlet pipe I, a fluid inlet pipe II and a fluid outlet pipe II are connected to the shell. The fluid inlet pipe I and the fluid outlet pipe I are connected with the inner space of the shell and are respectively arranged on two opposite side surfaces of the shell; a heat exchanger core is arranged in the shell, and a liquid inlet pipe of the fluid II and a liquid outlet pipe of the fluid II are respectively connected with an inlet and an outlet of the heat exchanger core.
The heat exchanger core comprises a plurality of micro-channel heat exchange units; each micro-channel heat exchange unit has the same structure and comprises two liquid collecting pipes and a plurality of micro-channel heat exchange pipes.
The liquid collecting pipes are linear metal pipes with semicircular sections and comprise plane pipe walls and cambered surface pipe walls, the plane pipe walls of the two liquid collecting pipes are arranged oppositely, through holes are formed in the plane pipe walls of the liquid collecting pipes, the through holes are arranged in a matrix mode, and two ends of the micro-channel heat exchange pipes are inserted into the through holes in the plane pipe walls of the two liquid collecting pipes respectively and are sealed and fixed through welding.
One end of each of the two liquid collecting pipes forming each micro-channel heat exchange unit is closed, the other end of each of the two liquid collecting pipes is open, and the open ends of the two liquid collecting pipes are arranged diagonally; the microchannel heat exchange tubes are thin-wall metal round tubes with two open ends, the tube core distance between every two adjacent microchannel heat exchange tubes is 1.5-2.5D, and D is the outer diameter of each microchannel heat exchange tube.
The microchannel heat exchange units are divided into two groups, wherein the microchannel heat exchange tubes of one group of microchannel heat exchange units are longitudinally arranged, the microchannel heat exchange tubes of the other group of microchannel heat exchange units are transversely arranged, the microchannel heat exchange units in one group and the microchannel heat exchange units in the other group are arranged in a staggered mode, and all the microchannel heat exchange units are arranged in parallel.
The open ends of the liquid collecting pipes on all sides in the micro-channel heat exchange units forming one group are communicated through a liquid inlet pipeline, one end of the liquid inlet pipeline is closed, and the other end of the liquid inlet pipeline is open; the open ends of all the liquid collecting pipes on the other side are communicated through liquid outlet pipes, one ends of the liquid outlet pipes are closed, and the other ends of the liquid outlet pipes are open; each group of microchannel heat exchange units are connected in parallel, and the open ends of the liquid inlet pipelines of the two groups of microchannel heat exchange units after being connected in parallel are communicated and connected with a liquid inlet pipe of a fluid II; and the open ends of the liquid outlet pipelines of the two groups of micro-channel heat exchange units which are connected in parallel are communicated and connected with a liquid outlet pipe of the fluid II.
Furthermore, the outer diameter D of the microchannel heat exchange tube is 0.5-2 mm, and the inner diameter D is 0.3-1.8 mm.
The invention provides a heat exchanger with a plurality of micro-channel heat exchange units arranged in a staggered manner, so that the heat exchange efficiency is higher, and the overall volume of the heat exchanger is saved. The invention can discharge more micro-channel heat exchange tubes in the same space, improve the heat exchange area and enhance the heat exchange effect. The invention has the advantages of simple structure, light weight, small volume, less material use and obvious improvement on heat exchange performance.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the microchannel heat exchange unit of FIG. 1;
FIG. 3 is a cross-sectional view A-A of the single microchannel heat exchange unit of FIG. 2;
FIG. 4 is a cross-sectional view of a single microchannel heat exchange unit B-B of FIG. 2.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figure 1, the micro-channel liquid cooling heat exchanger comprises a shell 1, wherein a fluid I inlet pipe 1-1, a fluid I outlet pipe 1-2, a fluid II inlet pipe 1-3 and a fluid II outlet pipe 1-4 are connected to the shell 1, and the fluid I inlet pipe 1-1 and the fluid I outlet pipe 1-2 are connected to the inner space of the shell 1 and are respectively arranged on two opposite side surfaces of the shell 1. A heat exchanger core is arranged in the shell 1, and a fluid inlet pipe 1-3 and a fluid outlet pipe 1-4 of the fluid II are respectively connected with an inlet and an outlet of the heat exchanger core.
As shown in fig. 1, 2, 3 and 4, the heat exchanger core comprises a plurality of microchannel heat exchange units 2, each microchannel heat exchange unit 2 has the same structure and comprises two liquid collecting pipes 2-1 and a plurality of microchannel heat exchange pipes 2-2. The liquid collecting pipe 2-1 is a linear metal pipe with a semicircular section and comprises a plane pipe wall and an arc pipe wall, the plane pipe walls of the two liquid collecting pipes 2-1 are arranged oppositely, through holes are formed in the plane pipe walls of the liquid collecting pipes 2-1, the through holes are arranged in a matrix mode, and two ends of the micro-channel heat exchange pipes 2-2 are inserted into the through holes in the plane pipe walls of the two liquid collecting pipes 2-1 respectively and are sealed and fixed through welding.
The two liquid collecting pipes 2-1 forming each micro-channel heat exchange unit 2 are closed at one end and open at the other end, and the open ends of the two liquid collecting pipes are arranged diagonally. The microchannel heat exchange tubes 2-2 are thin-walled metal round tubes with two open ends, the distance between the tube cores of the two adjacent microchannel heat exchange tubes is 1.5-2.5D, the outer diameter D of each microchannel heat exchange tube is 0.5-2 mm, and the inner diameter D of each microchannel heat exchange tube is 0.3-1.8 mm.
Referring to fig. 2, the microchannel heat exchange units 2 are divided into two groups (each group includes four microchannel heat exchange units in this embodiment), wherein the microchannel heat exchange tubes 2-2 of one group of microchannel heat exchange units 2 are longitudinally arranged (i.e., the liquid collecting tubes 2-1 are transversely arranged), the microchannel heat exchange tubes 2-2 of the other group of microchannel heat exchange units 2 are transversely arranged (i.e., the liquid collecting tubes 2-1 are longitudinally arranged), the microchannel heat exchange units 2 in one group and the microchannel heat exchange units 2 in the other group are staggered, and all the microchannel heat exchange units 2 are arranged in parallel. The liquid collecting pipes 2-1 are arranged in a staggered mode, and the micro-channel heat exchange pipes 2-2 are stacked in order and in parallel, so that the space is saved, and the arrangement of liquid inlet and outlet outlets on one surface is facilitated. The microchannel heat exchange tubes 2-2 of the two adjacent microchannel heat exchange units 2 are arranged in a staggered manner, so that the liquid outside the tube wall is prevented from flowing rapidly in one direction, and the heat exchange rate can be effectively improved.
The open ends of the liquid collecting pipes 2-1 at all sides in the micro-channel heat exchange units 2 forming one group are communicated through a liquid inlet pipeline, one end of the liquid inlet pipeline is closed, and the other end of the liquid inlet pipeline is open; the open ends of all the liquid collecting pipes 2-1 on the other side are communicated through liquid outlet pipes, one ends of the liquid outlet pipes are closed, and the other ends of the liquid outlet pipes are open; namely, each group of micro-channel heat exchange units 2 are connected in parallel; the open ends of the liquid inlet pipelines of the two groups of micro-channel heat exchange units which are connected in parallel are communicated and connected with liquid inlet pipes 1-3 of a fluid II; the open ends of the liquid outlet pipelines of the two groups of micro-channel heat exchange units which are connected in parallel are communicated and connected with liquid outlet pipes 1-4 of fluid II.
The performance of the enclosure type microchannel heat exchanger is analyzed by taking a single microchannel heat exchange unit with the length of 460mm, the width of 200mm and the height of 14mm as an example.
Each row of the stainless steel micro-channel circular tubes with the diameter of 0.38mm of the micro-channel heat exchange tube is provided with 100 micro-channel circular tubes, and the number of the micro-channel circular tubes is 4. Under the standard working condition that R410A is used as a refrigerating working medium, tap water with the temperature of 20 ℃ is used as cooling liquid (namely fluid I) outside a micro-channel, the inlet temperature is 79 ℃, and the outlet temperature of the refrigerant is 22 ℃ through experimental tests. The cooling water flow is 700kg/hThe flow rate of the refrigerant working medium (namely fluid II) is 152.8 kg/h. Firstly, calculating the heat exchange thermal resistance of the water side, and calculating the Reynolds number Re of the water sideD:ReD=ρwater·Velwater·Doutwater
Thus, the corresponding numsell number is expressed as:
the thermal resistance on the water side is:
reynolds number on the R410A side is:
neglecting the thermal resistance of the stainless steel tube, the thermal resistance is smaller because of the thinner wall thickness.
The thermal resistance on the refrigerant side is:
calculating the heat exchange quantity by adopting an e-NTU heat transfer unit number method:
calculating the heat exchange efficiency of the heat exchanger:
calculating the heat exchange amount (maximum heat exchange amount) of the micro-channel unit body:
the heat exchange performance of the condenser can reach 8083W through calculation, and the water side convection heat exchange coefficient is up to 1744W/m2K, the convective heat transfer coefficient of the working medium in the microchannel is 70W/m2-K. The total heat exchange efficiency of the heat exchanger reaches 82.46 percent, and the weight of the core body is only about 0.4 kg.
The volume ratio of the high-pressure working medium to the low-pressure working medium of the plate heat exchanger is usually 1, the volume ratio of the high-pressure working medium to the low-pressure working medium of the shell-and-tube heat exchanger is usually less than 1, and the volume ratio of the high-pressure working medium to the low-pressure working medium of the enclosed microchannel heat exchanger is changed from 0.1-0.03. The heat exchange quantity under the same volume and the same working condition is 10 times of that of a plate heat exchanger and 10-30 times of that of a shell and tube heat exchanger, and the application occasion of deep and complete heat exchange is facilitated.

Claims (2)

1. A folding type microchannel heat exchanger comprises a shell (1), wherein a fluid I inlet pipe (1-1), a fluid I outlet pipe (1-2), a fluid II inlet pipe (1-3) and a fluid II outlet pipe (1-4) are connected to the shell (1); the method is characterized in that:
the fluid I inlet pipe (1-1) and the fluid I outlet pipe (1-2) are connected with the inner space of the shell (1) and are respectively arranged on two opposite side surfaces of the shell (1); a heat exchanger core is arranged in the shell (1), and a fluid inlet pipe (1-3) and a fluid outlet pipe (1-4) of the fluid II are respectively connected with an inlet and an outlet of the heat exchanger core;
the heat exchanger core comprises a plurality of micro-channel heat exchange units (2); each micro-channel heat exchange unit (2) has the same structure and comprises two liquid collecting pipes (2-1) and a plurality of micro-channel heat exchange pipes (2-2);
the liquid collecting pipes (2-1) are linear metal pipes with semicircular sections and comprise plane pipe walls and cambered surface pipe walls, the plane pipe walls of the two liquid collecting pipes (2-1) are arranged oppositely, through holes are formed in the plane pipe walls of the liquid collecting pipes (2-1), a plurality of through holes are arranged in a matrix mode, and two ends of a plurality of micro-channel heat exchange pipes (2-2) are inserted into the through holes in the plane pipe walls of the two liquid collecting pipes (2-1) respectively and are sealed and fixed through welding;
one end of each of the two liquid collecting pipes (2-1) forming each micro-channel heat exchange unit (2) is closed, the other end of each of the two liquid collecting pipes is open, and the open ends of the two liquid collecting pipes are arranged diagonally; the microchannel heat exchange tubes (2-2) are thin-wall metal round tubes with two open ends, the tube core distance of two adjacent microchannel heat exchange tubes is 1.5-2.5D, and D is the outer diameter of each microchannel heat exchange tube;
the microchannel heat exchange units are divided into two groups, wherein the microchannel heat exchange tubes (2-2) of one group of microchannel heat exchange units are longitudinally arranged, the microchannel heat exchange tubes (2-2) of the other group of microchannel heat exchange units are transversely arranged, the microchannel heat exchange units (2) in one group and the microchannel heat exchange units (2) in the other group are arranged in a staggered mode, and all the microchannel heat exchange units (2) are arranged in parallel;
the open ends of the liquid collecting pipes (2-1) at all sides in the micro-channel heat exchange units (2) forming one group are communicated through a liquid inlet pipeline, one end of the liquid inlet pipeline is closed, and the other end of the liquid inlet pipeline is open; the open ends of all the liquid collecting pipes (2-1) on the other side are communicated through liquid outlet pipes, one ends of the liquid outlet pipes are closed, and the other ends of the liquid outlet pipes are open; each group of micro-channel heat exchange units (2) are connected in parallel, and the open ends of the liquid inlet pipelines of the two groups of micro-channel heat exchange units which are connected in parallel are communicated and connected with a liquid inlet pipe (1-3) of a fluid II; the open ends of the liquid outlet pipelines of the two groups of micro-channel heat exchange units which are connected in parallel are communicated and connected with liquid outlet pipes (1-4) of the fluid II.
2. The stacked microchannel heat exchanger of claim 1, wherein: the outer diameter D of the microchannel heat exchange tube is 0.5-2 mm, and the inner diameter D is 0.3-1.8 mm.
CN202010090943.3A 2020-02-13 2020-02-13 Enclosed stack type micro-channel heat exchanger Pending CN111336841A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010090943.3A CN111336841A (en) 2020-02-13 2020-02-13 Enclosed stack type micro-channel heat exchanger

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Application Number Priority Date Filing Date Title
CN202010090943.3A CN111336841A (en) 2020-02-13 2020-02-13 Enclosed stack type micro-channel heat exchanger

Publications (1)

Publication Number Publication Date
CN111336841A true CN111336841A (en) 2020-06-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113790476A (en) * 2021-09-01 2021-12-14 中山富雪泰制冷设备有限公司 Efficient energy-saving emission-reducing condensing unit and air conditioner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2015017A1 (en) * 2007-07-12 2009-01-14 Hexion Specialty Chemicals Research Belgium S.A. Heat exchanger
CN104154801A (en) * 2014-08-14 2014-11-19 丹佛斯微通道换热器(嘉兴)有限公司 Collecting pipe and heat exchanger
CN204154153U (en) * 2014-10-17 2015-02-11 夏文庆 A kind of longitude and latitude staggered pipe heat exchanger
CN106440910A (en) * 2016-09-06 2017-02-22 珠海格力电器股份有限公司 Micro-channel heat exchanger, manufacturing method and air conditioner

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2015017A1 (en) * 2007-07-12 2009-01-14 Hexion Specialty Chemicals Research Belgium S.A. Heat exchanger
CN104154801A (en) * 2014-08-14 2014-11-19 丹佛斯微通道换热器(嘉兴)有限公司 Collecting pipe and heat exchanger
CN204154153U (en) * 2014-10-17 2015-02-11 夏文庆 A kind of longitude and latitude staggered pipe heat exchanger
CN106440910A (en) * 2016-09-06 2017-02-22 珠海格力电器股份有限公司 Micro-channel heat exchanger, manufacturing method and air conditioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113790476A (en) * 2021-09-01 2021-12-14 中山富雪泰制冷设备有限公司 Efficient energy-saving emission-reducing condensing unit and air conditioner

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Application publication date: 20200626