CN110686545B - Phase-change heat storage strengthening device based on variable magnetic field and operation method thereof - Google Patents
Phase-change heat storage strengthening device based on variable magnetic field and operation method thereof Download PDFInfo
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- CN110686545B CN110686545B CN201910997533.4A CN201910997533A CN110686545B CN 110686545 B CN110686545 B CN 110686545B CN 201910997533 A CN201910997533 A CN 201910997533A CN 110686545 B CN110686545 B CN 110686545B
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
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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
Abstract
The invention discloses a phase-change heat storage strengthening device based on a variable magnetic field and an operation method thereof. The device comprises an electromagnetic coil, a power supply, a time relay, a heat reservoir shell, a phase change material, magnetic particles, a heat transfer fluid flow channel, a heat transfer fluid inlet and a heat transfer fluid outlet. When the phase-change material stores or releases heat, the electromagnetic coil periodically works under the action of a power supply and a time relay to pull the magnetic particles to move up and down in a solid-liquid interface and a liquid region to transfer heat, and meanwhile, the magnetic particles drive the liquid phase-change material to carry out forced convection. The invention strengthens the phase change process of the phase change material through two aspects of heat conduction and flow, and can obviously improve the phase change rate of the phase change material.
Description
Technical Field
The invention relates to the field of heat exchange enhancement, in particular to a phase-change heat storage enhancement device based on a variable magnetic field and an operation method thereof.
Background
At the same time of rapid development of economy in the current society, the energy crisis caused by exhaustion of fossil energy is gradually reflected, and the demand for increasing the utilization ratio of renewable energy is higher and higher. Renewable energy sources represented by solar energy and wind energy have the characteristic of discontinuous sources, so that an energy storage device needs to be configured in practical application.
The phase-change material has the advantages of high heat storage density, constant heat release temperature, good circulation stability, simple control and the like, and can be widely applied to the fields of solar heat storage, industrial waste heat utilization, building heat recovery and the like. However, the phase-change material has a low thermal conductivity coefficient, which severely limits the improvement of the heat storage/release rate and restricts the development of the practical application of the phase-change material. In view of the above, researchers have proposed various solutions, such as adding finned tubes or encapsulating into microcapsules to increase the heat exchange area, embedding into a foam metal frame or adding nano high thermal conductivity particles to improve the effective thermal conductivity. The promotion effect of natural convection on the melting/solidification process of the phase-change material is obvious, but the conventional phase-change strengthening technology limits the convection of the liquid phase-change material to a certain extent while improving the heat conduction, and limits the phase-change strengthening effect of the liquid phase-change material. Therefore, there is a need for a phase change enhancement device and method that can improve heat conduction without impairing or even enhancing convection.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a phase-change heat storage strengthening device based on a variable magnetic field and an operation method thereof.
The invention aims to realize the purpose of the invention by the following technical scheme:
a phase-change heat-storage strengthening device based on a variable magnetic field comprises a variable magnetic field generation part and a heat reservoir part;
the variable magnetic field generating part comprises an electromagnetic coil, a power supply and a time relay, and the connection mode is as follows: the electromagnetic coil, the power supply and the time relay are connected in series to form a closed circuit, and the electromagnetic coil is intermittently electrified under the control of the time relay;
the heat reservoir portion comprises a heat reservoir housing, a phase change material, magnetic particles, a heat transfer fluid flow channel, a heat transfer fluid inlet, and a heat transfer fluid outlet; the connection mode is as follows: the phase-change material and the magnetic particles are placed in the heat reservoir shell, the heat transfer fluid flow channel is arranged below the heat reservoir shell, the top of the heat transfer fluid flow channel and the bottom of the heat reservoir shell are in contact with each other for heat exchange, and the heat transfer fluid inlet and the heat transfer fluid outlet are respectively arranged on two sides of the heat transfer fluid flow channel; the electromagnetic coil coaxially surrounds the outer part of the heat reservoir shell, and magnetic field force generated by the electromagnetic coil pushes the magnetic particles to move upwards.
Preferably, the phase change material refers to a low melting point material capable of absorbing or releasing a large amount of latent heat upon conversion between a liquid state and a solid state, and includes an inorganic phase change material or an organic phase change material.
Further, the inorganic phase change material comprises molten salt and hydrated salt.
Further, the organic phase change material comprises paraffin and fatty acid.
Preferably, the magnetic particles comprise ferromagnetic particles or permanent magnet particles.
Further, the ferromagnetic particles comprise iron, cobalt and nickel particles.
Preferably, the diameter of the electromagnetic coil is uniformly increased from the top to the bottom, and the magnetic induction intensity gradient of the magnetic field generated inside is ensured to be upward.
Preferably, the heat transfer fluid flow channel and the heat reservoir housing are concentrically arranged, and both have circular cross sections.
Preferably, the heat transfer fluid inlet and the heat transfer fluid outlet are arranged at staggered heights on both sides of the heat transfer fluid flow passage.
Another objective of the present invention is to provide a method for operating the phase-change heat storage enhancement device according to any of the above aspects, which includes a heat storage enhancement method and a heat release enhancement method;
the heat storage strengthening method comprises the following steps:
high-temperature heat transfer fluid flows into the heat transfer fluid flow channel through the heat transfer fluid inlet, the temperature is reduced after heat is recovered, and the high-temperature heat transfer fluid flows out from the heat transfer fluid outlet; the phase-change material at the bottom of the heat reservoir absorbs the heat of the heat-carrying fluid and then is melted into a liquid state to store the heat; the electromagnetic coil is controlled to be periodically electrified through a power supply and a time relay to generate a magnetic field; when the electromagnetic coil works, the magnetic particles in the liquid part of the phase-change material move upwards, and when the electromagnetic coil stops working, the magnetic particles in the liquid part of the phase-change material move downwards under the action of gravity; the magnetic particles move up and down alternately, so that heat is carried from the bottom of the heat reservoir to a solid-liquid interface of the phase-change material to be released, and further, the melting of the unmelted part in the phase-change material is accelerated; meanwhile, the movement of the magnetic particles drives the melted part in the phase-change material to carry out forced convection to form a circulation flow, so that the melting of the unmelted part in the phase-change material is further accelerated, and the heat storage process is strengthened;
wherein the exothermic strengthening method comprises the following steps:
the low-temperature heat transfer fluid flows into the heat transfer fluid flow channel through the heat transfer fluid inlet, the temperature is increased after heat is absorbed, and the low-temperature heat transfer fluid flows out from the heat transfer fluid outlet; the phase-change material at the bottom of the heat reservoir slowly solidifies into a solid state after releasing heat; the electromagnetic coil is controlled to be periodically electrified through a power supply and a time relay to generate a magnetic field; when the electromagnetic coil works, the magnetic particles in the liquid part of the phase-change material move upwards, and when the electromagnetic coil works, the magnetic particles in the liquid part of the phase-change material move downwards under the action of gravity; the magnetic particles move up and down alternately, so that cold energy is carried to the liquid part of the phase-change material from the solid-liquid interface and released, and solidification of the liquid part in the phase-change material is accelerated; meanwhile, the movement of the magnetic particles drives the liquid part in the phase-change material to carry out forced convection to form circulation, so that the solidification of the liquid part in the phase-change material is further accelerated, and the heat release process is strengthened.
Compared with the prior art, the phase-change heat storage strengthening device based on the variable magnetic field has the advantages that the phase-change process of the phase-change material is strengthened through two aspects of heat conduction and flowing, and the phase-change speed of the phase-change material is remarkably improved. The magnetic particles added in the phase-change material generally have higher heat conductivity coefficient, so that the effective heat conductivity of the phase-change material can be improved; on the other hand, the magnetic particles are drawn to move up and down in the solid-liquid interface and the liquid region through the periodic work of the electromagnetic coil, so that the heat transfer is accelerated, and meanwhile, the magnetic particles drive the liquid phase-change material to carry out forced convection, so that the phase-change process is accelerated.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings so as to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a schematic structural diagram of a phase-change heat storage enhancing device based on a variable magnetic field according to the present invention.
In the figure: the device comprises an electromagnetic coil 1, a power supply 2, a time relay 3, a heat reservoir shell 4, a phase-change material 5, magnetic particles 6, a heat transfer fluid flow channel 7, a heat transfer fluid inlet 8 and a heat transfer fluid outlet 9;
Detailed Description
A preferred embodiment of the present invention provides a phase-change heat storage enhancement device based on a variable magnetic field and an operation method thereof, as shown in fig. 1, specifically comprising an electromagnetic coil 1, a power source 2, a time relay 3, a heat storage housing 4, a phase-change material 5, magnetic particles 6, a heat transfer fluid channel 7, a heat transfer fluid inlet 8 and a heat transfer fluid outlet 9.
The phase-change heat storage enhancing device can be divided into a variable magnetic field generating part and a heat storage part according to functions.
Wherein, the variable magnetic field produces the part to include electromagnetic coil 1, power 2 and time relay 3, its connection mode is: the electromagnetic coil 1, the power supply 2 and the time relay 3 are connected in series to form a closed circuit, wherein the time relay 3 plays a role of periodically switching on and off in the power supply circuit, so that the electromagnetic coil 1 is intermittently electrified under the control of the time relay 3, and an electromagnetic field is periodically generated.
The heat reservoir portion comprises a heat reservoir housing 4, phase change material 5, magnetic particles 6, a heat transfer fluid flow channel 7, a heat transfer fluid inlet 8 and a heat transfer fluid outlet 9, which are connected in the following manner: the phase change material 5 and the magnetic particles 6 are placed inside the heat reservoir housing 4. The phase change material 5 in this embodiment is a low melting point material that can absorb or release a large amount of latent heat when being converted between a liquid state and a solid state, and includes inorganic phase change materials such as molten salts and hydrated salts, and organic phase change materials such as paraffin and fatty acids, and one or more of them may be selected as necessary. The magnetic particles 6 in this embodiment include ferromagnetic particles such as iron, cobalt, and nickel, and permanent magnet particles, and one or more of them may be selected as necessary. In the magnetic field-free state, the magnetic particles 6 sink to the bottom of the heat reservoir housing 4 under the influence of gravity.
The heat transfer fluid flow channel 7 is designed into a disc form and is concentrically arranged below the cylindrical heat reservoir shell 4, and the top of the heat transfer fluid flow channel 7 is tightly contacted with the bottom of the heat reservoir shell 4 to realize heat exchange, so that a partition plate between the heat transfer fluid flow channel and the heat reservoir shell adopts high heat conduction materials as much as possible. The heat transfer fluid inlet 8 and the heat transfer fluid outlet 9 are symmetrically arranged on both sides of the heat transfer fluid channel 7, and cold fluid or hot fluid flows in from the heat transfer fluid inlet 8, then flows out from the heat transfer fluid outlet 9 after passing through the heat transfer fluid channel 7. In order to ensure that no dead flow angle occurs in the heat transfer fluid flow channel 7, the arrangement heights of the heat transfer fluid inlet 8 and the heat transfer fluid outlet 9 on the two sides of the heat transfer fluid flow channel 7 are staggered, namely the heat transfer fluid inlet 8 and the heat transfer fluid outlet 9 are respectively connected with the lower position of the left side and the upper position of the right side of the heat transfer fluid flow channel 7.
In the device, the enhanced heat exchange is realized by moving the magnetic particles 6 in the phase-change material 5 up and down, and the driving force of the magnetic particles 6 is from the electromagnetic coil 1. The electromagnetic coil 1 coaxially surrounds the exterior of the heat reservoir housing 4, and the magnetic field force generated by the electromagnetic coil 1 pushes the magnetic particles 6 to move upward against the gravity. When the electromagnetic coil 1 is powered on, the magnetic particles 6 move upwards, and when the magnetic particles 6 are powered off, the magnetic field force disappears, and the magnetic particles 6 sink towards the bottom of the heat reservoir shell 4 under the action of gravity, so that the magnetic particles 6 move up and down circularly.
In addition, in order to ensure that the magnetic field magnetic induction gradient generated inside is upward, and then the magnetic particles 6 are driven to move upward, the diameter of the electromagnetic coil 1 should be uniformly increased from the top to the bottom, and an upward magnetic attraction force can be applied to the magnetic particles 6 when the electromagnetic coil is powered on, and the magnetic attraction force should be large enough to overcome the self gravity.
Based on the phase-change heat storage strengthening device, the invention also provides a phase-change heat storage strengthening operation method which comprises a heat storage strengthening method and a heat release strengthening method.
The heat storage strengthening method comprises the following steps:
in the initial state, the phase change material 6 in the heat reservoir is at a lower temperature and is in a solid state. Then the high-temperature heat transfer fluid flows into the heat transfer fluid flow channel 7 through the heat transfer fluid inlet 8, the temperature is reduced after heat is recovered, and the heat transfer fluid flows out from the heat transfer fluid outlet 9; the phase-change material 5 at the bottom of the heat reservoir absorbs the heat of the heat-carrying fluid and then melts into liquid state to store the heat. Because the heat exchange is carried out at the bottom of the heat reservoir shell 4, the phase-change material 5 at the bottom of the heat reservoir absorbs the heat of the heat transfer fluid and then is gradually melted into a liquid state to store the heat, the phase-change material 5 above the heat reservoir still keeps a solid state, and a solid-liquid interface appears below the phase-change material 5. The intermittent on-off of a power supply circuit of the electromagnetic coil 1 is controlled by the power supply 2 and the time relay 3, so that the electromagnetic coil 1 is periodically electrified to generate a magnetic field, when the electromagnetic coil 1 works, the magnetic particles 6 in the liquid part of the phase-change material 5 move upwards, and when the electromagnetic coil 1 stops working, the magnetic particles 6 in the liquid part of the phase-change material 5 move downwards under the action of gravity, so that heat is carried from the bottom of the heat reservoir to a solid-liquid interface of the phase-change material 5 to be released through the alternating up-and-down movement of the magnetic particles 6, and the melting of the unmelted part in the phase-change material 5 is; meanwhile, the movement of the magnetic particles 6 drives the melted part in the phase-change material 5 to carry out forced convection to form a circulation flow, so that the melting of the unmelted part in the phase-change material 5 is further accelerated, and the heat storage process is strengthened;
in the same way, the heat release strengthening method comprises the following steps:
in the initial state, the phase change material 6 in the heat reservoir is in a liquid state with a high temperature. Then, low-temperature heat transfer fluid flows into the heat transfer fluid flow channel 7 through the heat transfer fluid inlet 8, the temperature is increased after heat is absorbed, and the low-temperature heat transfer fluid flows out from the heat transfer fluid outlet 9; the phase-change material 5 at the bottom of the heat reservoir slowly solidifies into a solid state after releasing heat. Because the heat exchange is carried out at the bottom of the heat reservoir shell 4, the phase-change material 5 at the bottom of the heat reservoir releases heat and then gradually solidifies into a solid state, the phase-change material 5 above the heat reservoir still keeps a liquid state, and a solid-liquid interface is also formed below the phase-change material 5. The intermittent on-off of a power supply circuit of the electromagnetic coil 1 is controlled through the power supply 2 and the time relay 3, so that the electromagnetic coil 1 is periodically electrified to generate a magnetic field, when the electromagnetic coil 1 works, the magnetic particles 6 in the liquid part of the phase-change material 5 move upwards, and when the electromagnetic coil 1 works, the magnetic particles 6 in the liquid part of the phase-change material 5 move downwards under the action of gravity, so that the magnetic particles 6 move up and down alternately, cold energy is carried to the liquid part of the phase-change material 5 from a solid-liquid interface to be released, and the solidification of the liquid part in the phase-change material 5 is accelerated; meanwhile, the movement of the magnetic particles 6 drives the liquid part in the phase-change material 5 to carry out forced convection to form circulation, so that the solidification of the liquid part in the phase-change material 5 is further accelerated, and the heat release process is strengthened.
It should be noted that the above-mentioned "high temperature" and "low temperature" are only relative expressions, and there is no clear temperature range, and the actual fluid temperature needs to be determined according to the actual working condition.
Therefore, when the phase-change material stores or releases heat, the electromagnetic coil periodically works under the action of the power supply and the time relay to pull the magnetic particles to move up and down in the solid-liquid interface and the liquid region to transfer heat, and meanwhile, the magnetic particles drive the liquid phase-change material to carry out forced convection. According to the invention, the phase change process of the phase change material is synchronously strengthened through two aspects of magnetic particle heat conduction and phase change material flow, and the phase change rate of the phase change material can be obviously improved compared with a heat storage device without strengthening measures or a heat storage device only with forced convection.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The operation method of the phase-change heat storage enhancement device is characterized by comprising a heat storage enhancement method and a heat release enhancement method;
the heat storage strengthening method comprises the following steps:
high-temperature heat transfer fluid flows into the heat transfer fluid flow channel (7) through the heat transfer fluid inlet (8), the temperature is reduced after heat is recovered, and the high-temperature heat transfer fluid flows out from the heat transfer fluid outlet (9); the phase-change material (5) at the bottom of the heat reservoir absorbs the heat of the heat-carrying fluid and then is melted into a liquid state to store the heat; the electromagnetic coil (1) is controlled to be periodically electrified through the power supply (2) and the time relay (3) to generate a magnetic field; when the electromagnetic coil (1) works, the magnetic particles (6) in the liquid part of the phase-change material (5) move upwards, and when the electromagnetic coil (1) stops working, the magnetic particles (6) in the liquid part of the phase-change material (5) move downwards under the action of gravity; the magnetic particles (6) move up and down alternately, so that heat is carried from the bottom of the heat reservoir to a solid-liquid interface of the phase-change material (5) to be released, and further the melting of the unmelted part in the phase-change material (5) is accelerated; meanwhile, the movement of the magnetic particles (6) drives the melted part in the phase-change material (5) to carry out forced convection to form circulation, so that the melting of the unmelted part in the phase-change material (5) is further accelerated, and the heat storage process is strengthened;
wherein the exothermic strengthening method comprises the following steps:
the low-temperature heat transfer fluid flows into the heat transfer fluid flow channel (7) through the heat transfer fluid inlet (8), the temperature is increased after heat is absorbed, and the low-temperature heat transfer fluid flows out of the heat transfer fluid outlet (9); the phase-change material (5) at the bottom of the heat reservoir slowly solidifies into a solid state after releasing heat; the electromagnetic coil (1) is controlled to be periodically electrified through the power supply (2) and the time relay (3) to generate a magnetic field; when the electromagnetic coil (1) works, the magnetic particles (6) in the liquid part of the phase-change material (5) move upwards, and when the electromagnetic coil (1) stops working, the magnetic particles (6) in the liquid part of the phase-change material (5) move downwards under the action of gravity; the magnetic particles (6) move up and down alternately, so that cold energy is carried to the liquid part of the phase-change material (5) from the solid-liquid interface to be released, and the solidification of the liquid part in the phase-change material (5) is accelerated; meanwhile, the movement of the magnetic particles (6) drives the liquid part in the phase-change material (5) to carry out forced convection to form circulation, so that the solidification of the liquid part in the phase-change material (5) is further accelerated, and the heat release process is strengthened;
the phase-change heat storage strengthening device comprises a variable magnetic field generating part and a heat storage part;
the variable magnetic field generating part comprises an electromagnetic coil (1), a power supply (2) and a time relay (3), and the connection mode is as follows: the electromagnetic coil (1), the power supply (2) and the time relay (3) are connected in series to form a closed circuit, and the electromagnetic coil (1) is intermittently electrified under the control of the time relay (3);
the heat reservoir portion comprises a heat reservoir housing (4), a phase change material (5), magnetic particles (6), a heat transfer fluid flow channel (7), a heat transfer fluid inlet (8) and a heat transfer fluid outlet (9); the connection mode is as follows: the phase-change material (5) and the magnetic particles (6) are placed inside the heat reservoir shell (4), the heat transfer fluid flow channel (7) is arranged below the heat reservoir shell (4), the top of the heat transfer fluid flow channel (7) is in contact with the bottom of the heat reservoir shell (4) for heat exchange, and the heat transfer fluid inlet (8) and the heat transfer fluid outlet (9) are respectively arranged on two sides of the heat transfer fluid flow channel (7); the electromagnetic coil (1) coaxially surrounds the outside of the heat reservoir shell (4), and magnetic field force generated by the electromagnetic coil (1) pushes the magnetic particles (6) to move upwards.
2. Method of operation according to claim 1, characterized in that the phase change material (5) is a low melting substance capable of absorbing or releasing large amounts of latent heat upon conversion between liquid and solid state, including inorganic or organic phase change materials.
3. The operating method according to claim 2, wherein the inorganic phase change material comprises a molten salt or a hydrated salt.
4. The method of operation of claim 2, wherein the organic phase change material comprises paraffin, fatty acid.
5. Method of operating according to claim 1, characterized in that the magnetic particles (6) comprise ferromagnetic or permanent magnet particles.
6. The method of operation of claim 5, wherein the ferromagnetic particles comprise iron, cobalt, nickel particles.
7. Method of operation according to claim 1, characterized in that the diameter of the electromagnetic coil (1) increases uniformly from top to bottom, ensuring that the magnetic field induction gradient of the internally generated magnetic field is directed upwards.
8. Method of operating according to claim 1, characterized in that the heat transfer fluid flow channel (7) and the heat reservoir housing (4) are arranged concentrically and are circular in cross-section.
9. Method of operation according to claim 1, characterized in that the heat transfer fluid inlet (8) and the heat transfer fluid outlet (9) are arranged offset in height on both sides of the heat transfer fluid flow channel (7).
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| JPH0526590A (en) * | 1991-07-24 | 1993-02-02 | Fuji Electric Co Ltd | Capsule for latent heat accumulating device |
| CN101281003A (en) * | 2008-05-23 | 2008-10-08 | 北京工业大学 | Magnetofluid flat plate hot pipe soaking device |
| DE102008040281A1 (en) * | 2008-07-09 | 2010-01-14 | Robert Bosch Gmbh | Device and method for cooling components |
| CN102527077A (en) * | 2011-12-16 | 2012-07-04 | 华南理工大学 | Method for boosting crystallization of phase-change cold-storing material of eutectic salt solution |
| CN106839848B (en) * | 2016-12-27 | 2018-08-24 | 浙江大学 | Mobile heat supply based on magnetic-particle heat transfer property orientation adjustment system and method stage by stage |
| CN109631647A (en) * | 2018-12-26 | 2019-04-16 | 安徽智磁新材料科技有限公司 | Utilize the heat accumulation method and device of foam copper and ferrofluid |
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