CN110849025B - Magnetic medium with high heat exchange rate and cold accumulator - Google Patents
Magnetic medium with high heat exchange rate and cold accumulator Download PDFInfo
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- CN110849025B CN110849025B CN201910961256.1A CN201910961256A CN110849025B CN 110849025 B CN110849025 B CN 110849025B CN 201910961256 A CN201910961256 A CN 201910961256A CN 110849025 B CN110849025 B CN 110849025B
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- working medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Abstract
The invention discloses a magnetic working medium with high heat exchange rate and a cold accumulator, which comprise a spherical magnetic working medium, a sheet magnetic working medium and a columnar magnetic working medium, wherein the surfaces of the spherical magnetic working medium, the sheet magnetic working medium and the columnar magnetic working medium are provided with heat exchange structures; the heat exchange structure is arranged on the surface of the magnetic working medium, so that the contact area of the magnetic working medium and the fluid is increased, and the heat exchange efficiency is improved; the flow guide grooves are arranged on the surface of the magnetic working medium, so that the porosity of the magnetic working medium is increased, and the fluid resistance of the magnetic working medium to the fluid is reduced; the heat exchange area of the fluid and the magnetic working medium is increased through the diversion holes and the heat exchange cavity, the heat exchange fluid can exchange heat with the inside of the magnetic working medium, and the heat exchange efficiency is improved; the regenerator contains the magnetic medium of high heat transfer rate to improve regenerator's heat exchange efficiency, improved performance.
Description
Technical Field
The invention relates to the technical field of magnetic refrigeration and heat exchange, in particular to a magnetic working medium with high heat exchange rate and a cold accumulator.
Background
The magnetic refrigeration effect refers to the phenomenon that magnetic refrigeration materials absorb and release heat under the change of an external magnetic field. The room temperature magnetic refrigeration technology is considered to be the most possible technology for replacing the traditional gas compression refrigeration at present due to the advantages of environmental protection, high efficiency, energy conservation and the like. The current research direction of the magnetic refrigeration technology mainly comprises the optimization research of improving the performance of the magnetic refrigeration material and the performance of a magnetic refrigeration prototype. At present, magnetic refrigeration materials are generally solid alloys, so that solid-liquid heat exchange is required to transfer heat generated by a magnetic working medium in the excitation/demagnetization process. The magnetic working medium used in the current magnetic refrigeration prototype is generally processed into spherical, cylindrical or laminar sheets and the like.
The regenerator is a device for placing a magnetocaloric effect material, and can realize the repeated excitation/demagnetization process of a magnetic working medium by enabling the regenerator and a stable magnetic field to generate periodic relative motion, so as to continuously absorb/release heat. By means of a hydraulically driven device, the heat generated by the magnetic refrigerant material (or the heat absorbed from the heat transfer fluid) is transferred by a hot/cold flow process to a hot/cold end heat exchanger.
The porosity is the volume ratio of the gap part to the storage space of the regenerator after the magnetic working medium is completely filled in the regenerator. Still taking the spherical magnetic working medium Gd as an example, the porosity thereof is different due to different stacking manners. The tight stacking of spherical magnetic media of the same size and with different radii can also be in different ways. For example, as shown in fig. 2, a simple cubic Stacking (SC) method of spherical magnetic media is adopted, wherein each spherical magnetic media is tangent to 6 same nearest spherical magnetic media, and the porosity of each spherical magnetic media is 47.64%; in addition, the structure has a face centered cubic stacking structure, a body centered cubic stacking structure and the like. Due to different stacking modes, the porosity of the spherical magnetic working medium is generally between 25.96 and 47.60 percent.
In addition to porosity, heat transfer area is also an important parameter in determining heat transfer efficiency. The contact area of the magnetic working medium and the heat exchange fluid is the heat exchange area, so that the improvement of the contact area of the magnetic working medium and the fluid is very important for improving the heat exchange efficiency.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a magnetic working medium with high heat exchange rate and a cold accumulator.
In order to realize the purpose, the invention provides the following technical scheme:
a magnetic working medium with high heat exchange rate is provided, and the surface of the magnetic working medium is provided with a heat exchange structure.
Preferably, the magnetic working medium comprises a spherical magnetic working medium, a sheet magnetic working medium and a columnar magnetic working medium, and the surfaces of the spherical magnetic working medium, the sheet magnetic working medium and the columnar magnetic working medium are all provided with a heat exchange structure.
Preferably, the heat exchange structure of the spherical magnetic working medium is a guide groove which is arranged in a crossed manner, and the width of the guide groove is w and the diameter of the spherical magnetic working medium is d
Preferably, the heat exchange structure of the spherical magnetic working medium is a flow guide hole, and the flow guide hole is a through hole.
Preferably, a heat exchange cavity is arranged inside the spherical magnetic working medium, and the flow guide hole is communicated with the heat exchange cavity.
Preferably, a plurality of flow guide holes are uniformly formed in the surface of the spherical magnetic working medium.
Preferably, the heat exchange structure of the sheet-shaped magnetic working medium is that a plurality of wavy guide grooves are arranged on two sides of the sheet-shaped magnetic working medium.
Preferably, the heat exchange structure of the sheet-shaped magnetic working medium is that a plurality of wavy guide grooves are arranged on two sides of the sheet-shaped magnetic working medium.
Preferably, the heat exchange structure is formed by adopting processing modes such as linear cutting and 3D printing.
A cold accumulator comprises a magnetic working medium, wherein the magnetic working medium is the magnetic working medium with high heat exchange rate.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the heat exchange structure is arranged on the surface of the magnetic working medium, so that the contact area of the magnetic working medium and the fluid is increased, and the heat exchange efficiency is improved.
2. The invention increases the porosity of the magnetic working medium by arranging the diversion trench on the surface of the magnetic working medium, thereby reducing the fluid resistance of the magnetic working medium.
3. The invention increases the heat exchange area of the fluid and the magnetic working medium through the diversion holes and the heat exchange cavity, and enables the heat exchange fluid to exchange heat with the inside of the magnetic working medium, thereby improving the heat exchange efficiency.
4. The regenerator comprises the magnetic working medium with high heat exchange rate, thereby improving the heat exchange efficiency of the regenerator and improving the service performance.
Drawings
FIG. 1 is a schematic structural diagram of a spherical magnetic medium according to an embodiment;
FIG. 2 is a comparison of a spherical magnetic working medium in use with a spherical magnetic working medium of the prior art;
FIG. 3 is a schematic structural diagram of a spherical magnetic medium according to the second embodiment;
FIG. 4 is a schematic structural diagram of a second spherical magnetic medium according to the second embodiment;
FIG. 5 is a schematic structural diagram of a sheet-shaped magnetic working medium;
FIG. 6 is a schematic structural diagram of a columnar magnetic working medium;
FIG. 7 is a comparison diagram of the flow guide groove before and after processing under the condition of face-centered cubic arrangement of spherical magnetic media with the same size.
In the figure: 1-spherical magnetic working medium; 2-a diversion trench; 3-a heat exchange cavity; 4-diversion holes; 5-sheet magnetic working medium; 6-column magnetic working medium.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the first embodiment, the first step is,
as shown in figure 1, the magnetic working medium with high heat exchange rate comprises a spherical magnetic working medium 1, a sheet magnetic working medium 5 and a columnar magnetic working medium 6, wherein heat exchange structures are arranged on the surfaces of the spherical magnetic working medium 1, the sheet magnetic working medium 5 and the columnar magnetic working medium 6.
The heat exchange structure of the spherical magnetic working medium is a guide groove 2 which is arranged in a cross way, the width of the guide groove 2 is w, and the diameter of the spherical magnetic working medium 1 is d
As shown in fig. 5, the heat exchange structure of the sheet-shaped magnetic medium 5 is that a plurality of wavy guide grooves 2 are arranged on both sides of the sheet-shaped magnetic medium.
As shown in fig. 6, the heat exchange structure of the column magnetic working medium 6 is that a plurality of wavy guide grooves 2 are arranged on the surface of the column magnetic working medium.
The present embodiment is explained in detail with reference to a spherical magnetic medium,
taking a spherical magnetic working medium 1 with a diameter of 0.5mm as an example, after a guide groove 2 with a width of 0.04mm and a depth of 0.08mm is processed on the surface, compared with a spherical magnetic working medium 1Gd without the guide groove 2 on the surface:
as shown in FIG. 2, in the case of simple cubic packing, the porosity is increased from 47.64% to 65.73%, and the heat exchange area is increased by 44.93%. The specific calculation process is as follows:
for a simple cubic packing structure, the porosity is calculated as follows:
Φ＝Vvoids/VGeneral assembly＝(VGeneral assembly-VSpherical magnetic working medium)/VGeneral assembly………………(1)
Bringing in
VGeneral assembly＝(0.5mm)3The porosity Φ can be calculated to be 47.64%.
After a gully with the width of 0.04mm and the depth of 0.08mm is machined on the surface of the spherical magnetic working medium, the increment of the volume is calculated to be VIncreaseSubstituting into formula (2)
Φ′＝VVoids/VGeneral assembly＝(VGeneral assembly-VSpherical magnetic working medium+VIncrease)/VGeneral assembly……………(2)
Substituting the above parameters can be calculated to yield Φ' 65.73%.
According to the derivation process, the porosity of the magnetic medium is improved from 47.64% to 65.73% due to the adoption of the magnetic medium surface processing method.
Similarly, the percentage of increase in the heat exchange area after the surface channel 2 is processed can be calculated to be 44.93%.
Fig. 2 is a comparison diagram of the front and back effects of a structure of a flow guide groove 2 under the condition that spherical magnetic working media 1 are simply and cubically arranged. The existence of the structure of the diversion trench 2 can be obviously seen, the surface area of the spherical magnetic working medium 1 is obviously increased, and the solid-liquid heat exchange process is facilitated.
Referring to fig. 7, for the face-centered cubic stacking method, the sphere diameter is 0.5mm, the width of the flow guide groove 2 is 0.04mm, and the depth of the flow guide groove 2 is 0.08 mm. In the case where the channels 2 are not provided, the porosity thereof is 25.96%, and the structure is a close-packed arrangement. However, after two vertical guide grooves 2 are processed on the surface of the spherical magnetic working medium by a precise processing means, the porosity of the spherical magnetic working medium can be increased.
Specifically, the width of the diversion trench 2 is 0.04mm, and the depth of the diversion trench 2 is 0.08 mm. According to calculation, under the morphology condition, the porosity of the spherical magnetic working medium is increased to 35.38% by taking the case of face-centered cubic arrangement as an example. The porosity increase was 36.29%.
It can also be calculated that the specific surface area is increased by 44.89% compared with the original specific surface area. The surface of the spherical magnetic working medium is processed into the diversion trench 2 with a specific shape, depth and width, so that the void ratio of the spherical magnetic working medium in the cold accumulation bed is obviously improved, and the heat exchange area of the spherical magnetic working medium is increased. Theoretically, a method capable of increasing the heat exchange efficiency is provided.
In addition, the optimal porosity of the magnetic working media in various shapes can be calculated according to actual conditions by combining simulation. Therefore, a processing mode for increasing the original porosity to the optimal porosity is designed, and a flow guide groove 2 with a specific size is designed on the surface of the spherical magnetic working medium by using precision processing modes such as linear cutting and the like. The heat exchange efficiency of the magnetic refrigeration device is improved.
In the second embodiment, the first embodiment of the method,
as shown in fig. 3-4, the heat exchange structure of the spherical magnetic medium 1 is a flow guide hole 4, a plurality of flow guide holes 4 are uniformly arranged on the surface of the spherical magnetic medium 1, and the flow guide holes 4 are through holes.
The spherical magnetic working medium 1 is internally provided with a heat exchange cavity 3, and the diversion holes 4 are communicated with the heat exchange cavity 3.
The heat exchange area of the fluid and the magnetic working medium is increased through the diversion holes 4 and the heat exchange cavity 3, and the heat exchange efficiency is improved.
In the third embodiment, the first step is that,
the regenerator comprises the magnetic working medium with high heat exchange rate in the first embodiment and the second embodiment, thereby improving the heat exchange efficiency of the regenerator.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (3)
1. A magnetic medium with high heat exchange rate is characterized in that: the surface of the magnetic working medium is provided with a heat exchange structure, and the magnetic working medium comprises a spherical magnetic working medium; the surface of the spherical magnetic working medium is provided with a heat exchange structure, the heat exchange structure of the spherical magnetic working medium is a diversion trench which is arranged in a crossed manner, and the width of the diversion trench is w and the diameter of the spherical magnetic working medium is d
The heat exchange structure of the spherical magnetic working medium is a flow guide hole, the flow guide hole is a through hole, a heat exchange cavity is arranged inside the spherical magnetic working medium, and the flow guide hole is communicated with the heat exchange cavity.
2. A high heat exchange rate magnetic working medium according to claim 1, wherein: the heat exchange structure is formed by adopting a linear cutting, 3D printing or casting processing mode.
3. A regenerator comprises a magnetic medium, and is characterized in that: the magnetic working medium is the magnetic working medium with high heat exchange rate as set forth in any one of claims 1-2.
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| CN112728805A (en) * | 2020-12-28 | 2021-04-30 | 珠海格力电器股份有限公司 | Magnetic regenerator and manufacturing method thereof, magnetic working medium bed and magnetic refrigerating device |
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| CN2183538Y (en) * | 1994-01-13 | 1994-11-23 | 沙金良 | High-enficiency hollow toothed-ball cold accumulator |
| DE10318510A1 (en) * | 2003-04-24 | 2004-11-11 | Leybold Vakuum Gmbh | Heat storage medium |
| CN100559097C (en) * | 2007-09-21 | 2009-11-11 | 四川大学 | A kind of style magnetism refrigerating mechanic medium wheel |
| JP6585017B2 (en) * | 2016-08-19 | 2019-10-02 | 株式会社東芝 | Cryogenic storage material for cryogenic refrigerator, cool storage type cryogenic refrigerator, and system equipped with cold storage type cryogenic refrigerator |
| CN107126975B (en) * | 2017-04-01 | 2020-06-30 | 四川群青新材料科技有限公司 | High-surface-area catalyst for liquid-solid reaction |
| CN108088112B (en) * | 2017-11-30 | 2023-12-08 | 珠海格力节能环保制冷技术研究中心有限公司 | Magnetic working medium assembly, magnetic working medium bed and magnetic refrigerator |
| CN209085409U (en) * | 2018-10-01 | 2019-07-09 | 内蒙古科技大学 | A kind of change sphere diameter groove heat storage heat storage tank |
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