CN113913161B - Phase change material and preparation method thereof, temperature control box and temperature control system - Google Patents
Phase change material and preparation method thereof, temperature control box and temperature control system Download PDFInfo
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- CN113913161B CN113913161B CN202111365586.8A CN202111365586A CN113913161B CN 113913161 B CN113913161 B CN 113913161B CN 202111365586 A CN202111365586 A CN 202111365586A CN 113913161 B CN113913161 B CN 113913161B
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- 239000012782 phase change material Substances 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000446 fuel Substances 0.000 claims abstract description 34
- MFUVDXOKPBAHMC-UHFFFAOYSA-N magnesium;dinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MFUVDXOKPBAHMC-UHFFFAOYSA-N 0.000 claims abstract description 34
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910021485 fumed silica Inorganic materials 0.000 claims abstract description 19
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims abstract description 17
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 17
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 17
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims abstract description 17
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 230000008859 change Effects 0.000 description 8
- 239000012528 membrane Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 238000010248 power generation Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000012074 organic phase Substances 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002775 capsule Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- UQSQSQZYBQSBJZ-UHFFFAOYSA-N fluorosulfonic acid Chemical compound OS(F)(=O)=O UQSQSQZYBQSBJZ-UHFFFAOYSA-N 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-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
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04052—Storage of heat in the fuel cell system
-
- 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
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Fuel Cell (AREA)
Abstract
The application relates to the field of phase change materials, and discloses a phase change material, a preparation method thereof, a temperature control box and a temperature control system. The phase change material comprises the following raw materials in percentage by weight: 93-96% of magnesium nitrate hexahydrate, 1.5-2.5% of carboxymethyl cellulose, 2-4% of calcium sulfate dihydrate and 0.5-1.5% of fumed silica. The phase change material has the characteristics of high enthalpy, low cost and high thermal conductivity, and can improve the temperature control effect on the fuel cell.
Description
Technical Field
The application relates to the field of phase change materials, in particular to a phase change material, a preparation method thereof, a temperature control box and a temperature control system.
Background
Currently, conventional fossil energy is increasingly exhausted, and serious environmental pollution is caused due to large-scale consumption of fossil energy, so that an environmentally friendly new energy is urgently needed. The hydrogen energy is a clean new energy source, the proton exchange membrane fuel cell takes hydrogen as fuel, can directly convert chemical energy in the hydrogen into electric energy, only discharges water in the power generation process, and is a zero-emission power generation device utilizing the hydrogen energy.
Currently, one of the key materials widely used in proton exchange membrane fuel cells is a perfluorosulfonic acid membrane-based proton exchange membrane. The membrane material needs to exert proton conduction property in the presence of water, and the optimal working temperature is 70-90 ℃, so that the proton exchange membrane fuel cell needs to be subjected to heat management. A large amount of heat is generated in the running process of the battery, when the temperature of the system is too high, the power generation efficiency is reduced, the service life is shortened, and therefore the temperature of the whole system needs to be controlled; when the temperature is lower than the low temperature, the power generation efficiency of the system is reduced, and even the system cannot be started, so that additional heat is needed to be supplemented to heat the system, and the power generation efficiency is improved rapidly. The phase change material has a constant phase change point, can absorb or release a large amount of heat without changing temperature during phase change, and is the optimal temperature control material for the fuel cell.
The Chinese patent CN 106654318A adopts the phase-change capsule as a temperature control material, skillfully designs a system, and can play a certain role in controlling temperature, but the enthalpy value of the phase-change capsule is lower and the manufacturing is troublesome; the Chinese patent No. 108251063A uses low-melting point alloy as the temperature control material of the fuel cell, and has high price and easy metal corrosion although the heat conduction property is good. Thus, there is a need for further improvements in phase change materials for fuel cells.
Disclosure of Invention
The application discloses a phase change material and a preparation method thereof, a temperature control box and a temperature control system, wherein the phase change material has the characteristics of high enthalpy value, low cost and high thermal conductivity, and can improve the temperature control effect on a fuel cell.
In order to achieve the above purpose, the present application provides the following technical solutions:
in a first aspect, the present application provides a phase change material comprising the following raw materials in weight percent:
further, the content of the magnesium nitrate hexahydrate is 93-95% by weight percent.
Further, the content of the carboxymethyl cellulose is 1.7-2.2% by weight percent.
Further, the content of the calcium sulfate dihydrate is 2.5-3.5% by weight percent.
Further, the content of the fumed silica is 0.7-1.3% by weight.
Further, the enthalpy value of the phase change material is more than or equal to 200J/g.
In a second aspect, the present application provides a method for preparing a phase change material, the method comprising: heating magnesium nitrate hexahydrate to be in a liquid state, mixing with the carboxymethyl cellulose, the calcium sulfate dihydrate and the fumed silica, and sealing and crystallizing to obtain the phase change material.
Further, heating magnesium nitrate hexahydrate to be liquid under the water bath condition of 80-95 ℃, and sequentially adding the carboxymethyl cellulose and the calcium sulfate dihydrate to be uniformly mixed to obtain an intermediate mixture; pouring the intermediate mixture into fumed silica, uniformly mixing the mixture in a water bath at the temperature of 80-95 ℃, sealing the mixture, and cooling and crystallizing the mixture to obtain the phase change material.
In a third aspect, the present application provides a temperature control box, including a box body, a first temperature control pipeline disposed in the box body, and the phase change material of the present application or the phase change material obtained by using the above preparation method.
In a fourth aspect, the present application provides a temperature control system for a fuel cell, including a fuel cell module, an adjusting pump, and a temperature control box of the present application, the temperature control box is disposed around the fuel cell module, and the adjusting pump is communicated with a first temperature control pipe in the temperature control box.
By adopting the technical scheme of the application, the beneficial effects generated are as follows:
the phase change material provided by the application is formed by magnesium nitrate hexahydrate, carboxymethyl cellulose, calcium sulfate dihydrate and fumed silica in a specific ratio, the enthalpy value of the obtained phase change material is more than 200J/g, and compared with an organic phase change material, the enthalpy value can be improved by more than 25%, and the cost can be reduced by more than 50%.
Drawings
FIG. 1 is a schematic view of a temperature control box according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a temperature control system according to an embodiment of the present application.
Reference numerals: 10-a temperature control box; 101-a box body; 102-a first temperature control pipeline; a 20-fuel cell module; 30-adjusting the pump.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely in connection with the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It should be noted that: in this application, all embodiments and preferred methods of implementation mentioned herein can be combined with each other to form new solutions, unless specifically stated otherwise. In the present application, all technical features mentioned herein as well as preferred features may be combined with each other to form new solutions, unless specified otherwise. In the present application, the percent (%) or parts refer to the weight percent or parts by weight relative to the composition, unless otherwise specified. In the present application, the components concerned or their preferred components may be combined with each other to form new technical solutions, unless otherwise specified. In this application, unless otherwise indicated, the numerical ranges "a-b" represent shorthand representations of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "6-22" means that all real numbers between "6-22" have been listed throughout, and "6-22" is only a shorthand representation of a combination of these values. The "range" disclosed herein may take the form of a lower limit and an upper limit, which may be one or more lower limits, and one or more upper limits, respectively. In the present application, each reaction or operation step may be performed sequentially or sequentially unless otherwise indicated. Preferably, the reaction processes herein are performed sequentially.
Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any method or material similar or equivalent to those described may be used in the present application.
In a first aspect, the present application provides a phase change material comprising the following raw materials in weight percent:
the phase change material provided by the application is formed by magnesium nitrate hexahydrate, carboxymethyl cellulose, calcium sulfate dihydrate and fumed silica in a specific ratio, the enthalpy value of the obtained phase change material is more than 200J/g, and compared with an organic phase change material, the enthalpy value can be improved by more than 25%, and the cost can be reduced by more than 50%.
Wherein, based on the weight of the phase change material, the magnesium nitrate hexahydrate accounts for 93%, 93.5%, 94%, 94.5%, 95%, 95.5% or 96% by weight, for example. In a preferred embodiment of the present application, the magnesium nitrate hexahydrate may be present in an amount of 93% to 95% by weight, the amount determining the ability of the phase change material to absorb and release heat.
The weight percent of carboxymethyl cellulose may be, for example, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, or 2.5% based on the weight of the phase change material. In a preferred embodiment of the present application, the weight percentage of carboxymethyl cellulose may be, for example, 1.7% to 2.2% to increase the viscosity of the phase change material in the liquid state.
The weight percentage of calcium sulphate dihydrate may be, for example, 2%, 2.2%, 2.4%, 2.6%, 2.7%, 2.8%, 3%, 3.2%, 3.4%, 3.6%, 3.7%, 3.8% or 4% based on the weight of the phase change material. In a preferred embodiment of the present application, the weight percentage of calcium sulfate dihydrate may be, for example, 2.5% to 3.5%, which is the nucleating agent for the phase change material.
The weight percentage of fumed silica can be, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, or 1.5% based on the weight of the phase change material. In a preferred embodiment of the present application, the weight percentage of fumed silica can be, for example, 0.7% to 1.3% to improve the liquid state of the phase change material and the stability of crystallization.
In a second aspect, the present application provides a method for preparing a phase change material, the method comprising the steps of: heating magnesium nitrate hexahydrate to be in a liquid state, mixing with the carboxymethyl cellulose, the calcium sulfate dihydrate and the fumed silica, and sealing and crystallizing to obtain the phase change material.
In one embodiment of the present application, the preparation method comprises the steps of: heating magnesium nitrate hexahydrate to be liquid under the water bath condition of 80-95 ℃, and sequentially adding the carboxymethyl cellulose and the calcium sulfate dihydrate to be uniformly mixed to obtain an intermediate mixture; pouring the intermediate mixture into fumed silica, uniformly mixing the mixture in a water bath at the temperature of 80-95 ℃, sealing the mixture, and cooling and crystallizing the mixture to obtain the phase change material.
As an exemplary illustration, a method of preparing a phase change material according to one embodiment of the present application includes the steps of:
step a), weighing a certain amount of fumed silica, and placing the fumed silica in a beaker a for standby;
step b), weighing a certain amount of magnesium nitrate hexahydrate, carboxymethyl cellulose and calcium sulfate dihydrate, sequentially adding into the beaker b, fully stirring and sealing;
step c), placing the sealed beaker b in a water bath kettle at 90 ℃ for heating until the beaker b is completely melted, and shaking the beaker for stirring in the melting process;
and d), pouring the melted and uniformly stirred solution into a beaker a filled with fumed silica, fully stirring, placing the beaker into a water bath at 90 ℃ after stirring for 5 minutes, continuously stirring for 10 minutes, and cooling to room temperature to obtain the phase change material.
The above preparation sequence is further exemplified, and the preparation method of the present application does not strictly limit the above process, and the operation sequence may be exchanged between the steps according to actual effects.
The phase change material obtained by the preparation method is an inorganic phase change material, and the enthalpy value of the inorganic phase change material can be improved by more than 25 percent and can reach 150J/g relative to the enthalpy value of an organic phase change material of 120J/g; in addition, the cost of the existing organic phase change material is about 10000 yuan/ton, while the cost of the inorganic phase change material can be reduced to 5000 yuan/ton.
The phase change material of the present application will be described in further detail with reference to specific examples.
Example 1
Step S1), weighing 95g of magnesium nitrate hexahydrate, placing in a beaker A, and heating to a liquid state in a water bath at 90 ℃;
step S2), weighing 2g of carboxymethyl cellulose and 2g of calcium sulfate dihydrate, sequentially adding into the beaker A, and fully stirring and mixing;
step S3), weighing 1g of fumed silica, placing in a beaker B, pouring the mixed solution in the beaker A into the beaker B, and fully mixing in a water bath at 90 ℃;
and S4), sealing the mixed beaker B with a preservative film, and cooling the mixed beaker B at room temperature until the mixed material is crystallized.
Examples 2-3 and comparative examples 1-3 are each a phase change material, and the specific preparation process can be referred to in example 1, and the specific raw materials are listed in Table 1.
TABLE 1
| Raw materials/g | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Magnesium nitrate hexahydrate | 95 | 93 | 94 | 90 | 98 | 95 |
| Carboxymethyl cellulose | 2 | 2 | 2.3 | 4.6 | 0.5 | 5 |
| Calcium sulfate dihydrate | 2 | 4 | 2.5 | 5 | 1.5 | 0 |
| Fumed silica | 1 | 1 | 1.2 | 0.4 | 0.5 | 0 |
Comparative examples 4-5 are each a phase change material whose raw material composition is shown in table 2.
TABLE 2
Enthalpy values of each of the examples and comparative examples were tested, and the test results are shown in table 3.
TABLE 3 Table 3
| Sequence number | Transformation point (DEG C) | Enthalpy value J/g |
| Example 1 | 75 | 175 |
| Example 2 | 69 | 170 |
| Example 3 | 72 | 172 |
| Comparative example 1 | 65 | 155 |
| Comparative example 2 | 80 | 167.1 |
| Comparative example 3 | 69 | 160 |
| Comparative example 4 | — | — |
| Comparative example 5 | 70 | 130 |
Note that: "-" means that no significant crystallization occurs and no particular value is present.
As can be seen from the test results of table 3, the phase change material of the embodiments of the present application may have a higher enthalpy value.
In a second aspect, the present application provides a temperature control box. Fig. 1 is a schematic structural diagram of an embodiment of the present application, as shown in fig. 1, in an embodiment of the present application, the temperature control box 10 includes a box body 101, a first temperature control pipe 102 disposed in the box body 101, and a phase change material of the present application or a phase change material obtained by using a preparation method of the present application. Wherein the phase change material is filled in the case 101. The box 101 is provided with an inlet and an outlet of a first temperature control pipeline 102, the first temperature control pipeline 102 is arranged in the box 101, and phase change materials in the embodiment of the application are filled between the boxes 101 of the first temperature control pipeline 102.
In a third aspect, the present application provides a temperature control system for a fuel cell. Fig. 2 is a schematic structural diagram of a temperature control system according to an embodiment of the present application. As shown in fig. 2, in one embodiment of the present application, the temperature control system includes a fuel cell module 20, a regulating pump 30, and a temperature control box 10 of the present application, the temperature control box 10 is disposed around the fuel cell module 20, and preferably, the temperature control box 10 may contact the fuel cell module 20 to improve heat transfer effect. Wherein the regulating pump 30 is in communication with a first temperature control pipe within the temperature control box 10.
The heat transfer medium in the first temperature control pipeline can be liquid or gas, and specifically, the heat transfer medium introduced into the first temperature control pipeline can be water. When the temperature in the temperature control box is higher, cooling water is introduced to cool the fuel cell module; when the temperature in the temperature control box is lower, the fuel cell module can be heated by introducing heating water. Therefore, better heat transmission can be carried out on the fuel cell module, so that the fuel cell can work in the optimal working temperature range, and the working efficiency is improved.
The working process of the fuel cell is a heating process, and when the temperature is too high, the performance of a cell stack in the fuel cell is reduced, and even a membrane electrode is burnt out, so that the cell stack is damaged; too low a temperature of the fuel cell at initial start-up also affects cell performance. After the temperature control system is added, the heat absorption capacity and the heat dissipation capacity of the unit volume are large due to the phase change energy storage material, and the problem of overheating or supercooling can be well solved. When the fuel cell works, the generated heat is exchanged to the phase change material through the heat transfer medium, and the phase change material absorbs the heat and the temperature can be continuously kept at a phase change point, so that the temperature of the whole system is controlled; the absorbed heat is preserved, and when the fuel cell is started again, the heat absorbed by the phase change material is transferred to the fuel cell module through the heat transfer medium, so that the fuel cell is started quickly.
It should be noted that, the temperature control system of the embodiment of the present application may include, in addition to the above-mentioned fuel cell module, the regulating pump, and the temperature control box, a second temperature control pipe that directly cools or heats the fuel cell module, where the second temperature control pipe is connected to the fuel cell module.
It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (9)
1. The phase change material is characterized by comprising the following raw materials in percentage by weight:
93% -96% of magnesium nitrate hexahydrate;
1.5 to 2.5 percent of carboxymethyl cellulose;
2% -4% of calcium sulfate dihydrate;
0.5 to 1.5 percent of fumed silica.
2. The phase change material of claim 1, wherein the magnesium nitrate hexahydrate is present in an amount of 93 to 95 weight percent.
3. The phase change material according to claim 1, wherein the content of the carboxymethyl cellulose is 1.7-2.2% by weight.
4. The phase change material according to claim 1, wherein the calcium sulfate dihydrate is present in an amount of 2.5-3.5% by weight.
5. The phase change material of claim 1, wherein the fumed silica is present in an amount of 0.7% to 1.3% by weight.
6. A method of preparing a phase change material according to any one of claims 1 to 5, comprising: heating magnesium nitrate hexahydrate to be in a liquid state, mixing with the carboxymethyl cellulose, the calcium sulfate dihydrate and the fumed silica, and sealing and crystallizing to obtain the phase change material.
7. The preparation method according to claim 6, wherein magnesium nitrate hexahydrate is heated to a liquid state under the water bath condition of 80-95 ℃, and the carboxymethyl cellulose and the calcium sulfate dihydrate are sequentially added and uniformly mixed to obtain an intermediate mixture; pouring the intermediate mixture into fumed silica, uniformly mixing the mixture in a water bath at the temperature of 80-95 ℃, sealing the mixture, and cooling and crystallizing the mixture to obtain the phase change material.
8. A temperature control box comprising a box body, a first temperature control pipeline arranged in the box body and the phase change material according to any one of claims 1-5 or obtained by the preparation method according to any one of claims 6-7.
9. A temperature control system for a fuel cell, comprising a fuel cell module, a regulating pump, and the temperature control box of claim 8, wherein the temperature control box is disposed around the fuel cell module, and the regulating pump is in communication with a first temperature control pipe in the temperature control box.
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2021
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| Title |
|---|
| MgCl2.6H2O-Mg(NO3)2•6H2O eutectic/SiO2 composite phase change material with improved thermal reliability and enhanced thermal conductivity;Ling, ZY 等;SOLAR ENERGY MATERIALS AND SOLAR CELLS;第172卷;195-201 * |
| Study of magnesium nitrate hexahydrate and magnesium chloride hexahydrate mixture as phase change material;Ding Qing等;2012 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC);4 * |
| 相变储能材料的研究及应用新进展;周建伟;刘星;;河南化工(第10期);7-10 * |
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