CN113563849A - Phase change device and method for heating medium by phase change device - Google Patents

Phase change device and method for heating medium by phase change device Download PDF

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Publication number
CN113563849A
CN113563849A CN202110792960.6A CN202110792960A CN113563849A CN 113563849 A CN113563849 A CN 113563849A CN 202110792960 A CN202110792960 A CN 202110792960A CN 113563849 A CN113563849 A CN 113563849A
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China
Prior art keywords
phase change
change material
change device
temperature
phase
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Pending
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CN202110792960.6A
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Chinese (zh)
Inventor
林漳
刘琦
黎兰
李阳
刘相新
余慧娟
李曜
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Beijing Institute of Space Launch Technology
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Beijing Institute of Space Launch Technology
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Priority to CN202110792960.6A priority Critical patent/CN113563849A/en
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02Materials undergoing a change of physical state when used
    • C09K5/06Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
    • C09K5/063Materials absorbing or liberating heat during crystallisation; Heat storage materials

Abstract

The invention provides a phase change device and a method for heating a medium by the phase change device, wherein the phase change device comprises a packing material, a phase change material and an oscillation unit, the packing material is coated outside the phase change material, the oscillation unit is arranged in the phase change material, the phase change point of the phase change material is higher than the highest temperature of the storage temperature of the phase change material, and the supercooling degree of the phase change material is greater than the difference value between the phase change point temperature and the lowest storage temperature of the phase change material. The phase change device has controllable energy releasing process, high energy density and fast heating rate of the heated medium.

Description

Phase change device and method for heating medium by phase change device
Technical Field
The invention relates to a material, in particular to a phase change device and a method for heating a medium by the phase change device.
Background
The phase-change material as a functional material for energy storage has the advantages of high energy storage density, controllable phase-change temperature point and the like, can store energy in a certain form under a specific condition and can be released and utilized under another specified condition, thereby realizing the purpose of consistent energy supply and demand. The energy storage-release characteristic can be used for heating substances and used as one of energy excitation ways of the power device. The traditional phase change material is used for ensuring the stability of the temperature of a regulated object, so that the supercooling degree of the phase change material is expected to be small, namely when the ambient temperature is higher than the phase change point of the phase change material, the phase change material absorbs the heat of the ambient temperature and changes from a solid state to a liquid state, and conversely, when the ambient temperature is lower than the phase change point of the phase change material, the phase change material releases the heat to the environment and changes from the liquid state to the solid state. As described above, the energy storage-release process of the phase-change material depends on the working environment temperature, and the phase-change material has poor controllability and low energy storage density, which affects the application of the phase-change material.
Disclosure of Invention
The invention aims to provide a phase change device which is controllable in energy release process, high in energy storage density and high in temperature rise rate.
To solve the above problems, the present invention provides a phase change device,
the phase change material storage temperature, the oscillation unit, the phase change material storage temperature's highest temperature, phase change material's supercooling degree is greater than the phase change point temperature and the phase change material minimum storage temperature's difference.
Further, the phase change material comprises a phase change agent, a nucleating agent and a thickening agent, wherein the phase change agent comprises 35% -68% of sodium acetate, 25% -50% of deionized water, 3% -6% of potassium chloride, 3% -5% of sodium chloride and 0.7% -1.4% of ammonium chloride, the nucleating agent comprises 0% -2% of magnesium chloride or 0% -2% of strontium chloride, and the thickening agent is clay 0.3% -0.6%.
Further, the oscillation unit is an ultrasonic oscillator.
Further, the oscillating unit is connected with a control device.
Furthermore, the packing material is made of a material which has good heat conducting property and does not react with the phase-change material.
Further, the packing material is made of stainless steel or aluminum.
Further, the packing material is made of HDPE plastic added with graphene or ABS plastic added with graphene.
The method for heating the medium by adopting the phase change device comprises the following steps:
placing the phase change device close to a medium to be heated;
and oscillating the oscillating unit, and releasing heat by the phase change device after oscillation.
Further, the vibration frequency at the oscillation unit was 10 times/sec.
Further, the oscillation time of the oscillation unit is 60 seconds or more.
According to the phase change device provided by the embodiment of the invention, the phase change point of the phase change material is higher than the highest temperature of the storage temperature of the phase change material, the supercooling degree of the phase change material is larger than the difference value between the phase change point temperature of the phase change material and the lowest storage temperature of the phase change material, so that the heat stored by the phase change material is increased, the crystallization temperature point of the phase change material is lower than the lowest storage temperature due to the supercooling degree of the phase change material, when the phase change material needs to release heat to the outside for heating or doing work, the supercooling degree is reduced through a vibration method, so that the phase change material actively releases heat, the process of releasing energy is controllable, the energy density is high, and the heating rate of a heated medium is high.
Drawings
FIG. 1 is a diagram illustrating a degree of supercooling of a phase change material in a phase change device according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a relationship between a phase change point temperature, a supercooling degree, and a storage temperature of a phase change material in a phase change device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a phase change device according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The terms "upper", "lower", "front", "rear", "left" and "right" and the like appearing in the embodiments of the present invention indicate directions or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
If there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
The traditional phase change material has the characteristics of high energy storage density, accurate phase change temperature point and the like, when the ambient temperature is higher than the phase change point of the phase change material, the phase change material absorbs the heat of the ambient temperature and changes from a solid state to a liquid state, and otherwise, when the ambient temperature is lower than the phase change point of the phase change material, the phase change material releases the heat to the ambient temperature and changes from the liquid state to the solid state. As shown in fig. 1, the difference between the actual crystallization temperature and the theoretical crystallization temperature (phase transition point) of the phase-change material is the supercooling degree of the phase-change material.
The phase change device of the embodiment of the invention, as shown in fig. 3, comprises a packing material 11, a phase change material 12 and an oscillation unit 13, wherein the packing material 11 is coated outside the phase change material 12, the oscillation unit 13 is arranged in the phase change material 12, the phase change point of the phase change material 12 is higher than the highest temperature of the storage temperature of the phase change material, the supercooling degree of the phase change material 12 is greater than the difference value between the phase change point temperature of the phase change material and the lowest storage temperature of the phase change material, and the relation among the phase change point temperature, the supercooling degree and the storage temperature of the phase change material is shown in fig. 2, the phase change material can not passively release energy in the storage environment, when the phase change device of the invention is required to heat or do work by externally releasing heat, the oscillation unit 13 generates oscillation, crystals in the phase change material are continuously crushed and continuously mixed with a melt through cavitation generated by the oscillation, and the aggregation and deposition of crystal nuclei are effectively prevented, the dispersibility of the crystal nucleus is improved, sufficient crystal nucleus with proper size is provided for heterogeneous nucleation, so that the supercooling degree of the phase-change material is reduced, the phase-change material releases heat to heat or do work to the outside, the supercooling degree of the phase-change material is reduced, and the phase-change material actively releases heat. According to the phase change device provided by the embodiment of the invention, as the phase change point of the phase change material 12 is higher than the highest temperature of the storage temperature of the phase change material, and the supercooling degree of the phase change material 12 is larger than the difference value between the phase change point temperature of the phase change material and the lowest storage temperature of the phase change material, the heat stored by the phase change material is increased, and as the supercooling degree of the phase change material is increased, the crystallization temperature point of the phase change material is lower than the lowest storage temperature, when the phase change material needs to heat or do work by releasing heat externally, the supercooling degree is reduced by a vibration method, so that the phase change material actively exerts heat, the process of releasing energy is controllable, the energy density is high, and the heating rate of a heated medium is high.
Optionally, the phase change material 12 includes a phase change agent, a nucleating agent, and a thickening agent, the phase change agent includes 35% to 68% of sodium acetate, 25% to 50% of deionized water, 3% to 6% of potassium chloride, 3% to 5% of sodium chloride, and 0.7% to 1.4% of ammonium chloride, the nucleating agent includes 0% to 2% of magnesium chloride or 0% to 2% of strontium chloride, and the thickening agent is clay, the phase change point of the phase change material 12 in the above proportions is higher than the highest temperature of the storage temperature of the phase change material, and the supercooling degree is greater than the difference between the temperature of the phase change point of the phase change material and the lowest storage temperature of the phase change material, so that the phase change point and the supercooling degree of the phase change material meet the requirements of various temperature values in fig. 2, and the phase change material cannot passively release energy in the storage environment, when the phase change material is required to release heat to heat the working medium to work, the oscillation unit 13 is caused to oscillate.
Optionally, the oscillating unit 13 is an ultrasonic oscillator, and the oscillating unit 13 may also select other oscillating elements.
Optionally, the oscillating unit 13 is connected to a control device 14, specifically, the control device 14 is a PLC controller, when the phase-change material is required to release heat to heat the working medium to perform work, the PLC controller sends a trigger signal to the oscillating unit 13 to cause the oscillating unit 13 to oscillate, and when the heating work is finished, the oscillating unit 13 stops oscillating.
Optionally, the packing material 11 is made of metal, such as stainless steel, aluminum, or other metal materials with high thermal conductivity and without chemical reaction with the phase change material, the packing material 11 may also be made of non-metal materials, such as HDPE plastic (high density polyethylene), ABS plastic, etc., the non-metal materials need to be added with graphene or other materials with high thermal conductivity, and the packing material 11 needs to be processed into various shapes corresponding to the phase change material 12.
The method for heating the medium by adopting the phase change device comprises the following steps:
placing the phase change device close to a medium to be heated;
make oscillation unit 13 produce the oscillation, the cavitation that produces through the oscillation makes the crystallization thing in the phase change material continuously broken and constantly mix with the fuse-element, effectively prevents the gathering and the deposit of crystal nucleus, improves the dispersibility of crystal nucleus, for heterogeneous shape nuclear provides sufficient, the crystal nucleus of suitable size to reduce phase change material's supercooling degree, make phase change material release heat to the external world heat or do work, reduce phase change material's supercooling degree, make phase change material initiatively exert heat.
Alternatively, the vibration frequency is 10 times/second during the oscillation of the oscillating unit 13.
Alternatively, the oscillation time of the oscillation unit 13 is 60 seconds or more so that the phase change material sufficiently exerts the heat.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.

Claims (10)

1. A phase change device is characterized in that,
the phase change material storage device comprises a packing material (11), a phase change material (12) and an oscillation unit (13), wherein the packing material (11) is coated outside the phase change material (12), the oscillation unit (13) is arranged in the phase change material (12), the phase change point of the phase change material (12) is higher than the highest temperature of the storage temperature of the phase change material, and the supercooling degree of the phase change material (12) is greater than the difference value of the phase change point temperature and the lowest storage temperature of the phase change material.
2. The phase change device according to claim 1,
the phase change material (12) comprises a phase change agent, a nucleating agent and a thickening agent, wherein the phase change agent comprises 35-68% of sodium acetate, 25-50% of deionized water, 3-6% of potassium chloride, 3-5% of sodium chloride and 0.7-1.4% of ammonium chloride, the nucleating agent comprises 0-2% of magnesium chloride or 0-2% of strontium chloride, and the thickening agent is 0.3-0.6% of clay.
3. The phase change device according to claim 2,
the oscillating unit (13) is an ultrasonic oscillator.
4. The phase change device according to claim 3,
the oscillating unit (13) is connected with a control device (14).
5. The phase change device according to claim 4,
the packing material (11) is made of a material which has good heat-conducting property and does not react with the phase-change material.
6. The phase change device according to claim 5,
the packing material (11) is made of stainless steel or aluminum.
7. The phase change device according to claim 5,
the packing material (11) is made of HDPE plastic added with graphene or ABS plastic added with graphene.
8. A method of heating a medium using the phase change device as claimed in any one of claims 1 to 7,
the method comprises the following steps: placing the phase change device close to a medium to be heated;
the oscillation unit (13) is made to oscillate, and the phase change device releases heat after the oscillation.
9. The phase change device heating medium method according to claim 8,
the vibration frequency of the oscillation unit (13) is 10 times/second.
10. The phase change device heating medium method according to claim 9,
the oscillation time of the oscillation unit (13) is 60 seconds or more.
CN202110792960.6A 2021-07-14 2021-07-14 Phase change device and method for heating medium by phase change device Pending CN113563849A (en)

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201434813Y (en) * 2009-06-16 2010-03-31 上海医大仪器厂 Liquid osmotic pressure measuring device with adjustable seeding time limit
CN102207477A (en) * 2011-03-15 2011-10-05 天津市天大天发科技有限公司 Refrigeration assembly of integrated oscillatory osmometer
CN202057618U (en) * 2011-03-15 2011-11-30 天津市天大天发科技有限公司 Refrigerating component of oscillatory osmotic pressure tester
CN202792752U (en) * 2012-06-15 2013-03-13 深圳力合节能技术有限公司 Ice making device with electromagnetic ice promoting device
CN103824823A (en) * 2014-03-10 2014-05-28 吴鸿平 Internal source and source adding fluid heat exchange system
CN204026829U (en) * 2014-07-09 2014-12-17 上海英科医疗用品有限公司 A kind of novel microwave oven heating service bag
CN110906623A (en) * 2019-10-30 2020-03-24 合肥晶弘电器有限公司 Instant freezing control method for refrigeration equipment and refrigeration equipment
CN111117572A (en) * 2019-12-05 2020-05-08 珠海格力电器股份有限公司 Composite phase-change material and preparation method thereof
CN111588436A (en) * 2020-04-27 2020-08-28 贵州省人民医院 A bag hemostasis pressurization area for implanted heart electron device
CN112680197A (en) * 2021-01-06 2021-04-20 华中科技大学 Inorganic hydrated salt composite phase-change material and preparation method thereof

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201434813Y (en) * 2009-06-16 2010-03-31 上海医大仪器厂 Liquid osmotic pressure measuring device with adjustable seeding time limit
CN102207477A (en) * 2011-03-15 2011-10-05 天津市天大天发科技有限公司 Refrigeration assembly of integrated oscillatory osmometer
CN202057618U (en) * 2011-03-15 2011-11-30 天津市天大天发科技有限公司 Refrigerating component of oscillatory osmotic pressure tester
CN202792752U (en) * 2012-06-15 2013-03-13 深圳力合节能技术有限公司 Ice making device with electromagnetic ice promoting device
CN103824823A (en) * 2014-03-10 2014-05-28 吴鸿平 Internal source and source adding fluid heat exchange system
CN204026829U (en) * 2014-07-09 2014-12-17 上海英科医疗用品有限公司 A kind of novel microwave oven heating service bag
CN110906623A (en) * 2019-10-30 2020-03-24 合肥晶弘电器有限公司 Instant freezing control method for refrigeration equipment and refrigeration equipment
CN111117572A (en) * 2019-12-05 2020-05-08 珠海格力电器股份有限公司 Composite phase-change material and preparation method thereof
CN111588436A (en) * 2020-04-27 2020-08-28 贵州省人民医院 A bag hemostasis pressurization area for implanted heart electron device
CN112680197A (en) * 2021-01-06 2021-04-20 华中科技大学 Inorganic hydrated salt composite phase-change material and preparation method thereof

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Application publication date: 20211029