CN112484537A - Shell-and-tube type point discharge solid-liquid phase change enhanced heat transfer device based on electrohydrodynamics - Google Patents

Shell-and-tube type point discharge solid-liquid phase change enhanced heat transfer device based on electrohydrodynamics Download PDF

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Publication number
CN112484537A
CN112484537A CN202011385545.0A CN202011385545A CN112484537A CN 112484537 A CN112484537 A CN 112484537A CN 202011385545 A CN202011385545 A CN 202011385545A CN 112484537 A CN112484537 A CN 112484537A
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China
Prior art keywords
phase change
tube
metal
liquid phase
heat transfer
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Pending
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CN202011385545.0A
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Chinese (zh)
Inventor
罗康
卢才磊
吴健
易红亮
谈和平
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Harbin Institute of Technology
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Harbin Institute of Technology
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Priority to CN202011385545.0A priority Critical patent/CN112484537A/en
Publication of CN112484537A publication Critical patent/CN112484537A/en
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    • 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
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/02Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
    • F28D20/021Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00Tubular elements; Assemblies of tubular elements
    • F28F1/10Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081Heat exchange elements made from metals or metal alloys
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14Thermal energy storage

Abstract

A shell-and-tube type point discharge solid-liquid phase change strengthening heat transfer device based on electrofluid mechanics belongs to the technical field of solid-liquid phase change strengthening. The invention solves the problem that the conventional passive strengthening technology cannot adjust the speed of the phase change process. The composite heat source comprises a metal outer pipe and a plurality of composite inner pipes arranged in the metal outer pipe, wherein a phase change material is filled between the metal outer pipe and the composite inner pipes, the metal outer pipe is grounded, the outer wall of the metal outer pipe is provided with a heat insulation layer, each composite inner pipe comprises a metal inner pipe, a plurality of groups of fins arranged outside the metal inner pipe and an insulation layer arranged on the inner wall of the metal inner pipe, the metal inner pipe is connected with a direct-current positive voltage, and a heat source circulates inside the metal. Compared with the existing passive strengthening technology, the speed of the phase change process can be actively controlled by adjusting the input voltage of the anode plate because the electric-heat convection intensity in the flow field is directly influenced by the potential difference between the anode plates. After the electric field is applied, the flow strength can be obviously enhanced, and a good phase change strengthening effect is obtained.

Description

Shell-and-tube type point discharge solid-liquid phase change enhanced heat transfer device based on electrohydrodynamics
Technical Field
The invention relates to a shell-and-tube type point discharge solid-liquid phase change strengthening heat transfer device based on electrofluid mechanics, and belongs to the technical field of solid-liquid phase change strengthening.
Background
Solid-liquid phase change materials are widely used in energy storage systems due to the advantages of large energy storage density, small temperature and volume changes and the like. Among them, organic phase change materials are widely used because of low melting point, good chemical stability and large latent heat of phase change. However, since the thermal conductivity of the organic phase change material is often very low, the internal heat transfer is slow in practical application, and the efficient storage of heat energy cannot be realized within a limited time. Therefore, a series of proposals have been made to enhance the solid-liquid phase change process and improve the energy storage efficiency. Factors influencing the speed of heat transfer mainly include the magnitude of the thermal conductivity of the fluid and the strength of convection. Aiming at the problem of low heat conductivity of the phase-change material, the arrangement of the metal inner fins is firstly proposed to enhance heat transfer, and then high-heat-conductivity particles can be added into the phase-change material to increase the effective heat conductivity of the composite phase-change material. Although these methods can achieve significant heat transfer enhancement, they tend to cause a large reduction in the capacity of the phase change material, thereby reducing the energy storage capacity of the energy storage system. And the passive strengthening technology cannot adjust the speed of the phase change process.
Disclosure of Invention
The invention aims to solve the problem that the conventional passive strengthening technology cannot regulate the speed of a phase change process, and further provides a shell-and-tube type point discharge solid-liquid phase change strengthening heat transfer device based on electrofluid mechanics.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the shell-and-tube type point discharge solid-liquid phase change enhanced heat transfer device based on electrohydrodynamics comprises a metal outer tube and a plurality of composite inner tubes arranged in the metal outer tube, phase change materials are filled between the metal outer tube and the composite inner tubes, the metal outer tube is grounded, the outer wall of the metal outer tube is provided with a heat insulation layer, the composite inner tubes comprise metal inner tubes, a plurality of groups of fins arranged outside the metal inner tubes and the heat insulation layer arranged on the inner wall of the metal inner tubes, the metal inner tubes are connected with direct-current positive voltage, and heat sources circulate inside the metal.
Furthermore, the two ends of the metal outer pipe are closed, and the composite inner pipes penetrate into the metal outer pipe from one end and penetrate out from the other end.
Further, the outer parts of the two ends of the metal outer pipe are respectively provided with a heat insulating layer.
Further, the radius of the metal outer pipe is R, the number of the composite inner pipes is nine, and the outer diameter of each composite inner pipe isInner diameters are all
Furthermore, the nine composite inner pipes are respectively a first inner pipe, four second inner pipes and four third inner pipes, wherein the first inner pipe and the metal outer pipe are coaxially arranged, the four second inner pipes are uniformly distributed around the circumference of the first inner pipe, and the axle center of each second inner pipe is positioned at the radiusOn the virtual circumference, four third inner tubes are uniformly distributed around the circumference of the first inner tube and are arranged with the four second inner tubes in a staggered way, and the axle center of each third inner tube is positioned at the position with the radius ofOn the virtual circumference of (a).
Furthermore, a plurality of groups of fins are uniformly distributed along the axial direction of the composite inner pipe.
Furthermore, each group of fins comprises a plurality of conical fin main bodies, and the conical fin main bodies are uniformly distributed along the circumferential direction of the outer wall of the composite inner pipe.
Further, the air conditioner is provided with a fan,the number of the conical fin bodies in each group of fins is eight, and the axial length of each conical fin body is equal to that of each conical fin bodyThe apex angle was 30 °.
Furthermore, the roots of the conical fin main bodies in each group of fins are fixedly connected into a whole through a lantern ring, and the lantern ring is sleeved on the composite inner pipe.
Further, a plurality of groups of fins on each two adjacent composite inner pipes are arranged in a staggered mode.
Compared with the prior art, the invention has the following effects:
the dynamic characteristic of the dielectric liquid under the action of the electric field is utilized, the direct current electric field is applied to the dielectric phase change material in the solid-liquid phase change process, strong electrothermal convection is induced and generated, the convective heat transfer is enhanced, and therefore solid-liquid phase change strengthening is achieved. Compared with the existing passive strengthening technology, the speed of the phase change process can be actively controlled by adjusting the input voltage of the anode plate because the electric-heat convection intensity in the flow field is directly influenced by the potential difference between the anode plates.
The phase change is strengthened through the enhancement convection heat transfer, and pure natural convection intensity is weaker in limited space, and the flow intensity can be obviously strengthened after the electric field is applied, so that a good phase change strengthening effect is obtained.
The dielectric phase change material is adopted as an energy storage medium, the current in the material is very weak, and even if a higher voltage is applied, the extremely small extra power consumption can be brought, so that the energy-saving and emission-reducing concept is met.
Drawings
FIG. 1 is a schematic front view of the present application;
FIG. 2 is a schematic side view of the present application;
FIG. 3 is a schematic cross-sectional view of a composite inner tube (collar not shown).
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 3, and a shell-and-tube type point discharge solid-liquid phase change enhanced heat transfer device based on electrofluid mechanics includes a metal outer tube 2 and a plurality of composite inner tubes 4 arranged in the metal outer tube 2, a phase change material 3 is filled between the metal outer tube 2 and the composite inner tubes 4, the metal outer tube 2 is grounded, and an insulating layer 1 is arranged on the outer wall of the metal outer tube 2, the composite inner tubes 4 include a metal inner tube 6, a plurality of groups of fins arranged outside the metal inner tube 6, and an insulating layer 7 arranged on the inner wall of the metal inner tube 6, the metal inner tube 6 is connected to a positive direct current voltage, and.
The composite inner tube 4 is an anode and is connected with direct-current positive voltage; the metal outer tube 2 is a cathode and is grounded; the high-temperature working medium is used as a heat source 8. The metal outer pipe 2 and the composite inner pipe 4 are both cylindrical structures.
The metal outer pipe 2 is heat-insulated and is mainly used for storing the phase-change material 3 and supporting structures of other components;
the heat source 8 circulating inside the metal inner pipe 6 is high temperature fluid (i.e. high temperature cycle working medium). The access voltage is reasonably selected, the higher the voltage in a certain range is, the larger the electric field intensity is, the better the electric field strengthening effect is, but the dielectric phase change material 3 is broken down due to the overhigh voltage.
The heat insulation layer 1 is arranged outside the metal outer pipe 2, so that heat in the device is prevented from being dissipated;
the metal inner pipes 6 are regularly arranged inside the metal outer pipe 2, and the metal inner pipes 6 have good heat conduction and electric conduction performance and can quickly transfer heat of high-temperature circulating working media inside the metal inner pipes 6 to the phase-change material 3.
The fins have two functions, namely increasing the heat exchange area and promoting the point discharge.
The heat exchange area is increased through a plurality of groups of fins, so that the heat exchange effect is enhanced, and the formation of a high-strength electric field by charge injection is facilitated. By arranging the insulating layer 7, the influence of electrification of a high-temperature circulating working medium (such as water) on the operation of the system is prevented. The phase change material 3 used was n-octadecane, a dielectric with a melting point of 28 ℃.
The larger the number of the metal inner tubes 6, the larger the heat exchange area, and the faster the phase change material 3 melts. However, the larger the number of metal inner tubes 6, the smaller the volume of the phase change material 3, and the less the heat storage capacity of the device. In addition, under the condition of the same number of the metal inner pipes 6, different modes of the metal inner pipes 6 have influence on the energy storage efficiency of the device. The diameter of the metal outer pipe is in the range of 400-700mm, the number of the metal inner pipes is not less than 3 and not more than 9, and the diameter of the metal inner pipes is 1/10-1/12 of the diameter of the metal outer pipe. The diameters are herein outer diameters.
At the same voltage, the charge injection is in direct proportion to the curvature of the surface of the polar plate. The thinner and thinner the fin top end is, the more favorable the charge injection is; the thickness and the length of fin can exert an influence to the heat transfer effect, also can influence the processing degree of difficulty and the structural strength of fin itself simultaneously. The fin thickness does not exceed the fin length 2/3, which is between 1/10 and 1/12 of the metal outer tube.
When the device starts to work, high-temperature fluid flows through the composite inner tube 4, the phase-change material 3 is heated to be molten, positive voltage is connected to the outer wall of the composite inner tube 4, the electric field is excited by point discharge on the outer surface, strong electric heat convection is gradually formed in the liquid phase-change material 3 (namely the phase-change material 3 filled between the composite inner tube 4 and the metal outer tube 2) under the drive of electric field force and buoyancy force, and convection heat transfer in the fluid is enhanced, so that the phase-change process is accelerated.
According to the solid-liquid phase change material, the dynamic characteristic of the dielectric liquid under the action of the electric field is utilized, the direct-current electric field is applied to the dielectric phase change material 3 in the solid-liquid phase change process, strong electrothermal convection is induced and generated, the convective heat transfer is enhanced, and therefore solid-liquid phase change strengthening is achieved. Compared with the existing passive strengthening technology, the speed of the phase change process can be actively controlled by adjusting the input voltage of the anode plate because the electric-heat convection intensity in the flow field is directly influenced by the potential difference between the anode plates.
The phase change is strengthened through the enhancement convection heat transfer, and pure natural convection intensity is weaker in limited space, and the flow intensity can be obviously strengthened after the electric field is applied, so that a good phase change strengthening effect is obtained.
According to the application, the dielectric phase-change material 3 is used as an energy storage medium, the current in the material is very weak, and even if a higher voltage is applied, only minimal extra electric quantity consumption can be brought, so that the energy-saving and emission-reducing concept is met.
The energy storage structure is a shell-and-tube type, and has a wider application range compared with the existing square cavity type container.
This application belongs to point discharge excitation electric field substantially, compares with the dull and stereotyped discharge among the prior art, more is favorable to forming high strength electric field under the low-voltage, and is more energy-concerving and environment-protective.
The two ends of the metal outer pipe 2 are sealed, and the composite inner pipes 4 penetrate into the metal outer pipe 2 from one end and penetrate out from the other end. High-temperature fluid enters through one end of the composite inner pipe 4, and flows out from the other end.
The metal outer pipe 2 is provided with heat insulating layers 1 at the outer parts of two ends.
The radius of the metal outer pipe 2 is R, the number of the composite inner pipes 4 is nine, and the outer diameter of each composite inner pipe 4 isInner diameters are allR is the outer diameter of the metal outer tube, including the thickness of the thermal insulation layer.
The nine composite inner tubes 4 are respectively a first inner tube, four second inner tubes and four third inner tubes, wherein the first inner tube is coaxially arranged with the metal outer tube 2, the four second inner tubes are uniformly distributed around the circumference of the first inner tube, and the axle center of each second inner tube is positioned at the radius of the axle centerOn the virtual circumference, four third inner tubes are uniformly distributed around the circumference of the first inner tube and are arranged with the four second inner tubes in a staggered way, and the axle center of each third inner tube is positioned at the position with the radius ofOn the virtual circumference of (a). The second inner pipe and the third inner pipe are arranged by being deflected by 45 degrees in the circumferential direction. So set up, rationally controlled the interval between the adjacent inner tube, and guaranteed that compound inner tube 4 fully contacts with phase change material 3, the heat transfer effect that compound inner tube 4 realized under this number and this arrangement mode is the best. The phase change material 3 is significantly melted when the number of inner tubes is reducedSlowing down and further increasing the number of inner tubes obviously leads to a reduction in the storage space for the phase change material 3, reducing the heat storage capacity of the system.
The plurality of groups of fins are uniformly distributed along the axial direction of the composite inner pipe 4.
Every group fin all includes a plurality of conical fin main parts 5, and is a plurality of conical fin main part 5 is along 4 outer wall circumference equipartitions of compound inner tube.
The number of the conical fin bodies 5 in each group of fins is eight, and the axial length of each conical fin body 5 is equal to that of each conical fin bodyThe apex angle was 30 °. The size and shape of the fins directly affect the heat exchange effect and the electric field strength excited by the discharge. So design, it is poor to avoid the heat transfer that fin main part 5 short leads to and discharge the effect, and fin main part 5 overlength leads to occupying phase change material 3 storage space, and easily leads to outside fin main part 5 to discharge and punctures phase change material 3 and the problem such as fin main part 5 structural strength decline.
The roots of a plurality of conical fin main bodies 5 in each group of fins are fixedly connected into a whole through a lantern ring, and the lantern ring is sleeved on the composite inner pipe 4. So design, the installation of the fin of being convenient for.
The plurality of groups of fins on each two adjacent composite inner pipes 4 are arranged in a staggered mode. By the design, discharge in the whole phase change material 3 is more uniform.

Claims (10)

1. A shell-and-tube type point discharge solid-liquid phase change enhanced heat transfer device based on electrofluid mechanics is characterized in that: it includes metal outer tube (2) and arranges a plurality of compound inner tubes (4) in metal outer tube (2), and packs phase change material (3) between metal outer tube (2) and compound inner tube (4), and metal outer tube (2) ground connection and its outer wall are provided with heat insulation layer (1), compound inner tube (4) include metal inner tube (6), arrange at the outside a plurality of groups fin of metal inner tube (6) and arrange at insulating layer (7) of metal inner tube (6) inner wall, and metal inner tube (6) access direct current positive voltage, and its inside circulation heat source (8).
2. The shell-and-tube tip discharge solid-liquid phase change enhanced heat transfer device based on the electrohydrodynamics as claimed in claim 1, characterized in that: the two ends of the metal outer pipe (2) are sealed, and the composite inner pipes (4) penetrate into the metal outer pipe (2) from one end and penetrate out from the other end.
3. The shell-and-tube tip discharge solid-liquid phase change enhanced heat transfer device based on the electrohydrodynamics as claimed in claim 2, characterized in that: the outer parts of the two ends of the metal outer pipe (2) are respectively provided with a heat insulating layer (1).
4. The shell-and-tube tip discharge solid-liquid phase change enhanced heat transfer device based on the electrohydrodynamics as claimed in claim 1, characterized in that: the radius of the metal outer pipe (2) is R, the number of the composite inner pipes (4) is nine, and the outer diameter of each composite inner pipe (4) isInner diameters are all
5. The shell-and-tube tip discharge solid-liquid phase change enhanced heat transfer device based on the electrohydrodynamics as claimed in claim 4, wherein: the nine composite inner pipes (4) are respectively a first inner pipe, four second inner pipes and four third inner pipes, wherein the first inner pipe is coaxially arranged with the metal outer pipe (2), the four second inner pipes are uniformly distributed around the circumference of the first inner pipe, and the axle center of each second inner pipe is positioned at the radiusOn the virtual circumference, four third inner tubes are uniformly distributed around the circumference of the first inner tube and are arranged with the four second inner tubes in a staggered way, and the axle center of each third inner tube is positioned at the position with the radius ofOn the virtual circumference of (a).
6. The shell-and-tube tip discharge solid-liquid phase change enhanced heat transfer device based on the electrohydrodynamics as claimed in claim 1, characterized in that: the plurality of groups of fins are uniformly distributed along the axial direction of the composite inner pipe (4).
7. The shell-and-tube tip discharge solid-liquid phase change enhanced heat transfer device based on electrofluid mechanics according to claim 6, characterized in that: every group fin all includes a plurality of conical fin main parts (5), and is a plurality of conical fin main part (5) are along compound inner tube (4) outer wall circumference equipartition.
8. The shell-and-tube tip discharge solid-liquid phase change enhanced heat transfer device based on the electrohydrodynamics as claimed in claim 7, wherein: the number of the conical fin main bodies (5) in each group of fins is eight, and the axial length of each conical fin main body (5) is equal to that of each conical fin main bodyThe apex angle was 30 °.
9. The shell-and-tube tip discharge solid-liquid phase change enhanced heat transfer device based on the electrohydrodynamics as claimed in claim 7 or 8, characterized in that: the roots of a plurality of conical fin main bodies (5) in each group of fins are fixedly connected into a whole through a lantern ring, and the lantern ring is sleeved on the composite inner pipe (4).
10. The shell-and-tube tip discharge solid-liquid phase change enhanced heat transfer device based on electrofluid mechanics according to claim 1, 2, 3, 4, 5, 6, 7 or 8, characterized in that: the plurality of groups of fins on every two adjacent composite inner pipes (4) are arranged in a staggered mode.
CN202011385545.0A 2020-12-01 2020-12-01 Shell-and-tube type point discharge solid-liquid phase change enhanced heat transfer device based on electrohydrodynamics Pending CN112484537A (en)

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CN113295035A (en) * 2021-06-22 2021-08-24 殷士海 Special heat exchanger of phase change material
CN114322624A (en) * 2021-12-27 2022-04-12 哈尔滨工业大学 Energy storage-release device for sectional type electric drive current coupling electric heating

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113295035A (en) * 2021-06-22 2021-08-24 殷士海 Special heat exchanger of phase change material
CN114322624A (en) * 2021-12-27 2022-04-12 哈尔滨工业大学 Energy storage-release device for sectional type electric drive current coupling electric heating

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