CN113375491A - Phase-change energy-storage heat exchange module - Google Patents
Phase-change energy-storage heat exchange module Download PDFInfo
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- CN113375491A CN113375491A CN202110572404.8A CN202110572404A CN113375491A CN 113375491 A CN113375491 A CN 113375491A CN 202110572404 A CN202110572404 A CN 202110572404A CN 113375491 A CN113375491 A CN 113375491A
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- heat exchange
- phase change
- plates
- change energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/021—Heat 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
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The invention discloses a phase-change energy-storage heat exchange module which comprises at least two heat exchange plates arranged in parallel at intervals and a heat exchange tooth group arranged between every two adjacent heat exchange plates; the heat exchange plate is provided with an internal interlayer for accommodating a phase change working medium; the spaces between the heat exchange plates form heat exchange channels. According to the phase change energy storage heat exchange module, the heat exchange tooth groups are arranged between the heat exchange plates, heat exchange teeth between the heat exchange plates and air are utilized for heat convection, the heat exchange teeth are conducted to the phase change working medium in the plates through the heat exchange plates, the air flowing through the phase change energy storage heat exchange module is efficiently heated/cooled through phase change latent heat, and the heat exchange efficiency is high.
Description
Technical Field
The invention relates to the technical field of phase change energy storage, in particular to a phase change energy storage heat exchange module.
Background
At present, most of heat storage devices utilize working medium materials for sensible heat storage, the devices utilizing phase change energy storage in the market are few, and efficient heat exchange efficiency and reliable packaging technology are few and few. Most devices for energy storage using phase change materials need to be in direct contact with a heat source and need to use special materials to improve thermal conductivity and solve the problems of phase change volume expansion and leakage, as in patent CN 104617350B. The phase change heat storage device partially adopting air for heat exchange, such as patent CN112710183A, adopts a stainless steel plate as a shell for encapsulating a phase change working medium, and has no heat dissipation fins, which can result in the reduction of heat exchange efficiency and increase the required size for achieving the same heat exchange effect. Another kind of air heat exchange phase change heat storage device, such as patent CN112611243A, has fins (i.e. fins) added to enhance the heat exchange efficiency, but needs to additionally conduct heat to the heat storage unit through the soaking plate, which complicates the design and increases the cost; in order to meet the strength requirement and strengthen heat transfer, the design of filling the phase-change material in the porous metal body is adopted, so that the total amount of the phase-change material is reduced, and the total energy storage capacity is reduced.
Disclosure of Invention
The invention aims to provide a phase-change energy-storage heat exchange module which can heat or cool air flowing through by phase-change latent heat and has high heat exchange efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: the phase-change energy-storage heat exchange module comprises at least two heat exchange plates which are arranged in parallel at intervals and a heat exchange tooth group arranged between every two adjacent heat exchange plates; the heat exchange plate is provided with an internal interlayer for accommodating a phase change working medium; the spaces between the heat exchange plates form heat exchange channels.
Preferably, the heat exchanger plate comprises two metal plates fitted opposite each other, the inner sandwich being formed between the two metal plates.
Preferably, one of the metal plates is a flat plate, and the other metal plate is a concave plate having a concave portion.
Preferably, the two metal plates are both concave plates with concave parts, and the two concave plates are oppositely matched with one concave surface to form the heat exchange plate.
Preferably, the two metal plates are flat plates, and the two flat plates are connected through a peripheral rib plate after being oppositely matched.
Preferably, the heat exchanger plate further comprises a support structure arranged in the inner sandwich;
the support structure comprises one or more of a support rack, a reinforcing rib and a support column.
Preferably, the phase-change energy-storage heat exchange module further comprises two groups of positioning connection assemblies respectively matched with the two opposite end portions of the at least two heat exchange plates.
Preferably, the positioning connection assembly comprises a connection block arranged between the ends of each two adjacent heat exchange plates; the connecting block is connected with the end part of the heat exchange plate through a welding or fastening assembly.
Preferably, the heat exchange tooth group comprises a plurality of heat exchange racks arranged in parallel; each heat exchange rack comprises a plurality of folding convex parts which are sequentially connected along the length direction of the heat exchange rack.
Preferably, the heat exchange tooth group comprises a plurality of folding convex parts which are arranged to form a plurality of rows and a plurality of columns.
Preferably, the heat exchange tooth group is fixed between two adjacent heat exchange plates by brazing.
Preferably, the phase-change energy-storage heat exchange module further comprises a phase-change working medium accommodated in an inner interlayer of the heat exchange plate;
and the heat exchange plate is provided with a liquid injection port communicated with the internal interlayer and used for injecting the phase change working medium.
According to the variable energy storage heat exchange module, the heat exchange tooth groups are arranged between the heat exchange plates, heat exchange teeth between the heat exchange plates and air are utilized for heat convection, the heat is conducted to the phase change working medium in the plates through the heat exchange plates, the air flowing through the heat exchange plates is efficiently heated/cooled through phase change latent heat, and the heat exchange efficiency is high.
The internal interlayer of the heat exchange plate is arranged, 90% of working medium in volume can be stored, the energy storage volume utilization rate is high, and the total energy storage capacity of unit volume is improved.
Drawings
FIG. 1 is a schematic structural diagram of a phase change energy storage heat exchange system according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of portion A of FIG. 1;
FIG. 3 is a schematic structural diagram of a frame in a phase change energy storage heat exchange system according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a positioning structure in a phase change energy storage heat exchange system according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a phase change energy storage heat exchange module according to an embodiment of the invention;
FIG. 6 is an exploded view of a heat exchange plate of the phase change energy storage heat exchange module of FIG. 5;
fig. 7 is a schematic structural diagram of a heat exchange tooth set on a heat exchange plate in the phase change energy storage heat exchange module shown in fig. 5.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, a phase change energy storage heat exchange system according to an embodiment of the present invention includes a frame 10 and a plurality of phase change energy storage heat exchange modules 20 disposed in the frame 10.
At least one accommodating space 100 is arranged on the frame 10, and two opposite sides of the accommodating space 100 are open to form an air inlet side and an air outlet side respectively; the plurality of phase change energy storage heat exchange modules 20 are arranged in the accommodating space 100 in parallel at intervals. The interval between the phase change energy storage heat exchange modules 20 forms the heat exchange channel, and the heat exchange channel is located between air inlet side and air outlet side and is linked together with air inlet side and air outlet side to the air gets into the heat exchange channel from the air inlet side, discharges from the air outlet side after carrying out the heat transfer with phase change energy storage heat exchange modules 20.
As shown in fig. 1 and 3, the frame 10, which may include an outer frame structure 11, provides support and positioning throughout the system. An accommodating space 100 is formed inside the outer frame structure 11; alternatively, the inside of the outer frame structure 11 is divided into two or more accommodating spaces 100 by a plurality of partition plates 12, and the plurality of accommodating spaces 100 may be arranged in one row or one column, or arranged to form a plurality of rows and a plurality of columns.
As shown in fig. 1 and 4, in order to position the phase change energy storage heat exchange module 20 and stabilize it in the accommodating space 100, a positioning structure 30 for positioning the phase change energy storage heat exchange module 20 may be disposed at the top and/or the bottom of the accommodating space 100.
In the present embodiment, as shown in fig. 4, the positioning structure 30 includes a positioning plate 31, and a plurality of steps 32 arranged in parallel at intervals on the positioning plate 31; the space between two adjacent steps 32 forms a guide positioning groove 33. The end of each phase change energy storage heat exchange module 20 is fitted in the guide positioning groove 33.
According to the phase change energy storage heat exchange module 20, the heat exchange module is vertically disposed in the accommodating space 100, and in a preferred embodiment, the top and the bottom of the accommodating space 100 are respectively provided with a positioning structure 30. The positioning structure 30 at the top is disposed downward with the guide positioning slot 33, and the positioning structure 30 at the bottom is disposed upward with the guide positioning slot 33 and is one-to-one opposite to the guide positioning slot 33 on the positioning structure 30 at the top. The phase change energy storage heat exchange module 20 is vertically placed, and is respectively matched with the corresponding guide positioning groove 33 through the top end and the bottom end of the phase change energy storage heat exchange module, so that the phase change energy storage heat exchange module 20 is vertically fixed in the accommodating space 100. Moreover, after the two ends of the phase-change energy-storage heat exchange module 20 are engaged with the guide positioning slots 33, the phase-change energy-storage heat exchange module can slide back and forth along the guide positioning slots 33 to enter and exit the accommodating space 100.
In other embodiments, the guide positioning grooves 33 may be directly formed on the top and/or bottom of the accommodating space 100 without the positioning plate 31 and the step 32.
The phase-change energy-storage heat exchange module 20 can be further provided with a handle and other structural members, so that the phase-change energy-storage heat exchange module 20 can be conveniently lifted, placed, installed, moved and the like.
As shown in fig. 5, each phase change energy storage heat exchange module 20 includes at least two heat exchange plates 21 arranged in parallel at intervals, and a heat exchange tooth group 22 disposed between two adjacent heat exchange plates. The interval between every two adjacent heat exchange plates 21 also forms the heat exchange channel that communicates the air inlet side and the air outlet side, and heat exchange tooth group 22 is in the heat exchange channel, increases heat transfer area, improves heat exchange efficiency.
The heat exchanger plate 21 has an inner interlayer for containing the phase change working medium. The heat exchange plate 21 can be provided with a liquid injection port 210 communicated with the internal interlayer, so that the phase change working medium can be conveniently injected into the internal interlayer, and the sealing is carried out after the liquid injection is finished, thereby solving the packaging problem with low cost. The internal interlayer in the heat exchange plate 21 can store 90% volume working medium, the utilization rate of the energy storage volume is high, and the total energy storage capacity of unit volume is improved.
Wherein, the phase change working medium can be solid-liquid phase change media such as paraffin and the like. Setting the phase change temperature of the working medium of the phase change working medium to be the temperature T0 required to maintain constant temperature; when the air temperature entering the heat exchange channel is higher than T0, the solid working medium in the heat exchange plate 21 is liquefied and absorbs heat; when the air temperature entering the heat exchange channel is lower than T0, the liquid working medium in the heat exchange plate 21 is solidified and releases heat, so as to maintain the constant outlet air temperature of the system.
The number of the heat exchange plates 21 of each phase change energy storage heat exchange module 20 is set to be N (N is an integer greater than or equal to 2), and then the number of the heat exchange tooth groups 22 is N-1. Among them, N is preferably three or more.
Specifically, as shown in fig. 5 and 6, the heat exchanger plate 21 may include two metal plates 211 that are fitted to each other, and the two metal plates 211 are fitted at their peripheries and sealed together by welding such as brazing, and an inner interlayer is formed between the two metal plates 211. The liquid inlet 210 may be provided between the peripheral edges of the two metal plates 211, or on either of the metal plates 211. The metal plate 211 is a thin metal plate.
In the embodiment shown in fig. 6, one metal plate 211 is a flat plate, and the other metal plate 211 is a concave plate having a concave portion 212. The concave plate faces the flat plate with the concave surface, and the concave plate and the flat plate are in sealed connection through the periphery after being matched oppositely. The recess 212 has a depth to accommodate the phase change medium.
In other embodiments, the two metal plates 211 may be both concave plates having the concave portion 212, and the concave surfaces of the two concave plates are opposite to each other to form the heat exchange plate 21; the two recesses 212 cooperate to form an inner cavity forming an inner sandwich to contain the phase change medium. Or, the two metal plates 211 are both flat plates, and the two flat plates are connected through a peripheral rib plate after being matched oppositely; the peripheral ribs have a width to define an interior sandwich between the two plates to contain the phase change medium.
In order to improve the structural strength of the heat exchange plate 21 and improve the heat exchange efficiency, the heat exchange plate 21 further comprises a support structure 213, which is disposed between the two metal plates 211, i.e., in the inner interlayer, and does not affect the phase change and circulation of the phase change working medium in the inner interlayer.
The support structure 213 may include one or more of a support rack, a stiffener, and a support post. The supporting rack can be a plurality of supporting racks, each supporting rack can comprise a plurality of folding bulges which are connected in sequence, and the folding bulges can be formed by stamping; the folding bulges which are adjacent up and down (or adjacent left and right) are arranged in a staggered way; the plurality of supporting racks can be arranged in parallel in a plurality of rows, and the plurality of rows can be further connected in sequence to form an integral supporting tooth module. The strengthening rib can be a plurality of, and a plurality of strengthening ribs interval parallel arrangement fix on a metal sheet 211 or two metal sheets 211 through modes such as welding. The supporting columns may be multiple, distributed in the internal interlayer and fixed at two ends on the two metal plates 211 respectively.
In the phase change energy storage heat exchange module 20, the heat exchange tooth group 22 is located between the two heat exchange plates 21, and may be fixed on the surface of one heat exchange plate 21 or the surfaces of the two heat exchange plates 21 by welding such as brazing.
Alternatively, the heat exchange tooth set 22 may include a plurality of heat exchange racks arranged in parallel; each heat exchange rack comprises a plurality of folding convex parts which are sequentially connected along the length direction of the heat exchange rack. Alternatively, the heat exchange tooth set 22 includes a plurality of folded projections arranged in a plurality of rows and columns.
As for the above-described folded bosses, they may be formed on the heat exchange metal plate by means of punching or the like. The interior of the folding bulge part is hollowed out for air to pass through. Between the heat exchange plates 21, the folded bosses correspond with their open sides in the air convection direction (i.e., on the air intake side and the air exhaust side).
The arrangement of the heat exchange teeth 22 and the supporting structure 213 inside and outside the heat exchange plate 21 improves the structural strength of the heat exchange plate 21 and the whole phase change energy storage heat exchange module 20, so that the heat exchange plate can resist the volume expansion caused by the phase change. For the condition that the heat exchange tooth group 22 and the supporting rack are arranged at the same time, the arrangement directions of the heat exchange tooth group 22 and the supporting rack are preferably staggered, such as staggered 90 degrees and other various angles, so that the phase change, expansion and collapse of the working medium are facilitated, and the structural strength is enhanced.
Further, the phase-change energy-storage heat exchange module 20 further includes two sets of positioning connection assemblies 23 respectively fitted at two opposite ends of the heat exchange plate 21. The positioning connection assembly 23 is arranged at the end of the heat exchange plate 21, connects and positions the ends of the heat exchange plates 21 arranged in parallel at intervals, and also limits the intervals between the heat exchange plates 21. The two end parts of the heat exchange plate 21 and the positioning connecting component can be respectively provided with a positioning hole, so that the assembly and the positioning are convenient.
According to the vertical placement of the phase change energy storage heat exchange module 20 in the accommodating space 100, the two positioning and connecting assemblies 23 are respectively matched with the top end and the bottom end of the heat exchange plate 21.
As shown in fig. 5, in the present embodiment, the positioning connection assembly 23 includes a connection block 231 interposed between the ends of each adjacent two heat exchange plates 21; the connection block 231 is connected to the end of the heat exchange plate 21 by welding or fastening assembly. The width of the connection block 231 is equal to the spacing between the two heat exchange plates 21.
The positioning and connecting assembly 23 may further comprise an end connecting block 232 disposed at one side of the outermost heat exchange plate 21, the end connecting block 232 and the connecting block 231 being stacked in parallel to clamp the end of the heat exchange plate 21 therebetween.
Preferably, the phase change energy storage heat exchange module 20 is made of a high thermal conductivity metal such as aluminum. For example, the heat exchange plate 21 and the heat exchange tooth group 22 are made of thin aluminum plates, and the positioning and connecting assembly 23 is made of aluminum blocks or aluminum profiles.
When the phase change energy storage heat exchange module 20 is manufactured, the heat exchange plate 21, the heat exchange tooth group 22 and the positioning connecting assembly 23 can be assembled together, and then brazing is performed again to fixedly connect all the components together, so that the structural strength is high. Of course, after being matched, the components in the phase change energy storage heat exchange module 20 may also be fixed together by other welding methods, fastening assemblies, or gluing.
After the fixed connection of the heat exchange plate 21 and other parts is completed, liquid injection is performed, the phase change working medium in a molten state is injected into the heat exchange plate 21 through the liquid injection port 210, and the sealing is performed after the completion.
When the phase change energy storage heat exchange system is used, firstly, the frame 10 is fixed at the air outlet of the energy supply equipment, and the outlet air of the energy supply equipment is used as the inlet air of the phase change energy storage heat exchange system. The phase-change energy-storage heat exchange module 20 is inserted into the accommodating space 100 of the frame 10, and the phase-change working medium in each heat exchange plate 21 of the phase-change energy-storage heat exchange module 20 is selected from the working medium with the melting point consistent with the indoor required temperature.
When the inlet air temperature of the system exceeds the melting point of the phase-change working medium, the heat of convective heat transfer is transferred to the phase-change working medium in the plate through the heat transfer tooth groups 22 among the heat transfer plates 21 and the surfaces of the heat transfer plates 21; the phase-change working medium absorbs heat to melt, reduces the air temperature and keeps the outlet temperature of the system at the required temperature. And when the inlet air temperature of the system is equal to the melting point of the phase change working medium, the system stops working. When the temperature of the inlet air of the system is lower than the melting point of the phase-change working medium, the heat is conducted to the surfaces of the heat exchange tooth group 22 and the heat exchange plate 21 from the phase-change working medium, and the temperature of the air is heated to the required temperature. Thereby realizing the maintenance of constant temperature in the room.
When the heat exchange capacity of the system is not as expected, the fault point can be searched by sequentially checking the phase change energy storage heat exchange modules 20, and when the phase change energy storage heat exchange modules 20 are found to be in problem, the system can be maintained only by replacing the phase change energy storage heat exchange modules 20, so that the maintenance is simple and the cost is low. When the extreme condition that the heat load is too high occurs, the heat exchange capacity of the system can be flexibly adjusted by replacing the completely liquefied invalid phase change energy storage heat exchange module 20.
In addition, when the phase-change energy-storage heat exchange system is used and the load is low, the phase-change energy-storage heat exchange module 20 can be reduced so as to reduce the wind resistance of the system; when the load is higher, the phase change energy storage heat exchange module 20 can be added for temperature adjustment.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The phase-change energy-storage heat exchange module is characterized by comprising at least two heat exchange plates which are arranged in parallel at intervals and a heat exchange tooth group arranged between every two adjacent heat exchange plates; the heat exchange plate is provided with an internal interlayer for accommodating a phase change working medium; the spaces between the heat exchange plates form heat exchange channels.
2. The phase change energy storage heat exchange module of claim 1 wherein the heat exchange plates comprise two metal plates mated with each other, the internal interlayer being formed between the two metal plates.
3. The phase change energy storage heat exchange module as claimed in claim 2, wherein one of the metal plates is a flat plate, and the other metal plate is a concave plate having a concave portion; alternatively, the first and second electrodes may be,
the two metal plates are both concave plates with concave parts, and the concave surfaces of the two concave plates are oppositely matched to form the heat exchange plate; alternatively, the first and second electrodes may be,
two the metal sheets are flat plates, and the two flat plates are connected through a peripheral rib plate after being matched relatively.
4. The phase change energy storage heat exchange module of claim 2, wherein the heat exchange plate further comprises a support structure disposed in the inner sandwich;
the support structure comprises one or more of a support rack, a reinforcing rib and a support column.
5. The phase change energy storage heat exchange module of claim 1 further comprising two sets of positioning connection assemblies respectively fitted at opposite ends of at least two of the heat exchange plates.
6. The phase change energy storage heat exchange module of claim 5 wherein the positioning connection assembly comprises a connection block disposed between the ends of each adjacent two of the heat exchange plates; the connecting block is connected with the end part of the heat exchange plate through a welding or fastening assembly.
7. The phase change energy storage heat exchange module of claim 1 wherein the heat exchange tooth set comprises a plurality of heat exchange racks arranged in parallel; each heat exchange rack comprises a plurality of folding convex parts which are sequentially connected along the length direction of the heat exchange rack.
8. The phase change energy storage heat exchange module of claim 1 wherein the set of heat exchange teeth includes a plurality of folded bosses arranged to form a plurality of rows and columns.
9. The phase change energy storage heat exchange module according to any one of claims 1 to 8, wherein the heat exchange tooth sets are fixed between two adjacent heat exchange plates by brazing.
10. The phase change energy storage heat exchange module as claimed in any one of claims 1 to 8, further comprising a phase change working medium contained in an inner interlayer of the heat exchange plate;
and the heat exchange plate is provided with a liquid injection port communicated with the internal interlayer and used for injecting the phase change working medium.
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| CN202110572404.8A CN113375491A (en) | 2021-05-25 | 2021-05-25 | Phase-change energy-storage heat exchange module |
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| CN202110572404.8A CN113375491A (en) | 2021-05-25 | 2021-05-25 | Phase-change energy-storage heat exchange module |
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| US20200300551A1 (en) * | 2019-03-21 | 2020-09-24 | Hamilton Sundstrand Corporation | Heat exchanger temperature change rate control |
| CN211903856U (en) * | 2020-02-11 | 2020-11-10 | 王键 | Heat exchange module and heat exchanger |
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| CN104596338A (en) * | 2015-01-27 | 2015-05-06 | 苏州皇家整体住宅系统股份有限公司 | Modularized phase-change heat storage device |
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