CN114085653A - Glauber's salt composite phase-change material system and controllable crystal growth method thereof - Google Patents
Glauber's salt composite phase-change material system and controllable crystal growth method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 67
- 239000012782 phase change material Substances 0.000 title claims abstract description 63
- 239000010446 mirabilite Substances 0.000 title claims abstract description 50
- 238000002109 crystal growth method Methods 0.000 title claims abstract description 7
- RSIJVJUOQBWMIM-UHFFFAOYSA-L sodium sulfate decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-]S([O-])(=O)=O RSIJVJUOQBWMIM-UHFFFAOYSA-L 0.000 title claims description 20
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 75
- 239000013078 crystal Substances 0.000 claims abstract description 30
- 239000011232 storage material Substances 0.000 claims abstract description 28
- 238000005338 heat storage Methods 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000002667 nucleating agent Substances 0.000 claims abstract description 8
- 239000002562 thickening agent Substances 0.000 claims abstract description 8
- 239000003607 modifier Substances 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 22
- 239000007787 solid Substances 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 13
- 239000011780 sodium chloride Substances 0.000 claims description 11
- 229920002472 Starch Polymers 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 10
- 239000004615 ingredient Substances 0.000 claims description 10
- 239000008107 starch Substances 0.000 claims description 10
- 235000019698 starch Nutrition 0.000 claims description 10
- XYQRXRFVKUPBQN-UHFFFAOYSA-L Sodium carbonate decahydrate Chemical group O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-]C([O-])=O XYQRXRFVKUPBQN-UHFFFAOYSA-L 0.000 claims description 9
- 229910021538 borax Inorganic materials 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000004328 sodium tetraborate Substances 0.000 claims description 9
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 9
- 229920001131 Pulp (paper) Polymers 0.000 claims description 8
- 229940018038 sodium carbonate decahydrate Drugs 0.000 claims description 8
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 6
- 239000004917 carbon fiber Substances 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 239000002121 nanofiber Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229940056729 sodium sulfate anhydrous Drugs 0.000 claims 1
- 238000004146 energy storage Methods 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 9
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 239000012071 phase Substances 0.000 description 24
- 229910052938 sodium sulfate Inorganic materials 0.000 description 22
- 230000008859 change Effects 0.000 description 20
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 17
- 239000007832 Na2SO4 Substances 0.000 description 15
- 229910000029 sodium carbonate Inorganic materials 0.000 description 8
- 239000011734 sodium Substances 0.000 description 7
- 235000011152 sodium sulphate Nutrition 0.000 description 7
- 230000004580 weight loss Effects 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004781 supercooling Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000013517 stratification Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000004936 Bromus mango Nutrition 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 240000007228 Mangifera indica Species 0.000 description 1
- 235000014826 Mangifera indica Nutrition 0.000 description 1
- 235000009184 Spondias indica Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 1
- HFCSXCKLARAMIQ-UHFFFAOYSA-L disodium;sulfate;hydrate Chemical compound O.[Na+].[Na+].[O-]S([O-])(=O)=O HFCSXCKLARAMIQ-UHFFFAOYSA-L 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229940001593 sodium carbonate Drugs 0.000 description 1
Classifications
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- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/004—Preparation in the form of granules, pieces or other shaped products
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Inorganic Chemistry (AREA)
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Abstract
The application relates to the technical field of phase-change materials, and particularly discloses a mirabilite composite phase-change material system and a crystal controllable growth method thereof. A mirabilite composite phase-change material system comprises the following raw materials in parts by weight: 85-90% of a main heat storage agent, 1-10% of a secondary heat storage agent, 1-4% of a modifier, 0.2-1% of a thickening agent, 1-4% of a nucleating agent and 30-32% of a hydrosolvent; the controllable crystal growth method comprises the following steps: s1, preparing a molten mirabilite-based composite phase-change material system; s2, preparing a mirabilite-based composite phase-change liquid system; s3, cooling and crystallizing. The composite phase change material system has a good energy storage effect; the controllable crystal growth method has the advantages of controllable crystallization heat release, and safe and convenient operation.
Description
Technical Field
The application relates to the technical field of phase-change materials, in particular to a mirabilite composite phase-change material system and a crystal controllable growth method thereof.
Background
Energy brings great improvement to the activities of human beings at present, and is closely related to the progress of society. Currently, energy shortage has become a problem in most countries, and people are constantly asking for non-renewable energy, causing the problem that most non-renewable energy is mined out. The increase of the utilization rate of energy attracts the wide scientific research enthusiasts, and the preparation and the development of new energy also have attraction.
The phase change energy storage material refers to a material that absorbs or releases a large amount of thermal energy by undergoing a phase change in a specific temperature range, and the absorbed or released thermal energy is referred to as latent heat of phase change. Compared with a sensible heat energy storage material, the phase change energy storage material has higher energy storage density.
Latent heat storage is a regulation and control on the problem of mismatching of solar energy in time and space by absorbing and releasing energy through the phase change process of a phase change energy storage material. The phase-change storage of the phase-change energy storage material is utilized to ensure that the solar energy storage material has small volume, higher energy storage density of the energy storage material, almost unchanged phase-change temperature, easy control and regulation, and certain storage function for the problem of mismatching of solar energy time and space. Meanwhile, the phase change energy storage material generates certain heat exchange capacity through the change around the phase change process, so that the capacity of releasing and absorbing heat energy is generated around the phase change material through the phase change process of the phase change material, and the purpose of improving the environmental temperature is achieved.
The mango nitro phase change energy storage material has the advantages of constant temperature of absorption and heat release, wide phase change temperature range, large energy storage density, high energy utilization rate, low cost and environmental protection, and realizes energy cycle storage and release by utilizing solid-liquid phase reversible change.
However, different environmental temperatures require different amounts of heat, and if the mirabilite-based phase-change energy storage material releases the same amount of heat all the time, insufficient or excessive released heat inevitably occurs, thereby causing energy waste.
Disclosure of Invention
In order to control the heat release of the mirabilite-based phase change energy storage material and reduce energy waste, the application provides a mirabilite composite phase change material system and a crystal controllable growth method thereof.
The application provides a mirabilite composite phase-change material system and a controllable crystal growth method thereof, which adopt the following technical scheme:
in a first aspect, the application of mirabilite provides a mirabilite composite phase-change material system, which adopts the following technical scheme:
a mirabilite composite phase-change material system comprises the following raw materials in parts by weight: 85-90% of a main heat storage agent, 1-10% of a secondary heat storage agent, 1-4% of a modifier, 0.2-1% of a thickening agent, 1-4% of a nucleating agent and 30-32% of a hydrosolvent.
By adopting the technical scheme, the heat storage performance of the composite phase-change material system is enhanced because the main heat storage agent and the secondary heat storage agent are adopted for storing heat simultaneously; the thickening agent can block the relative movement of the fluid body, and the effect of preventing phase delamination of the phase change material is achieved; the nucleating agent enables the composite phase-change material system to timely generate phase change when reaching a condensation point, the two components are added, the phenomena of supercooling and phase layering of the composite phase-change material system are eliminated, the service life of the phase-change material is effectively prolonged, the phase-change temperature of the composite phase-change material system is adjusted to be 10-30 ℃, the phase-change reversibility is good, and the composite phase-change material system has a good energy storage effect.
Preferably, the main heat storage agent is sodium sulfate decahydrate.
By adopting the technical scheme, sodium sulfate decahydrate is used as a main component of mirabilite, is a good heat storage material, can be dissolved by adding water, can be crystallized after filtering and heating and concentrating filtrate, and is the best choice for preparing a composite phase-change material system.
Preferably, the secondary heat storage agent is sodium carbonate decahydrate.
By adopting the technical scheme, the sodium carbonate decahydrate is used as the hydrate of the sodium carbonate containing 10 crystal water, is easy to dissolve in water, can emit partial heat when meeting water, stores heat with the sodium sulfate decahydrate serving as the main heat storage agent, and has a good heat storage effect.
Preferably, the modifier is sodium chloride.
By adopting the technical scheme, a certain amount of sodium chloride is added into the sodium sulfate decahydrate, so that the melting point of the sodium chloride can be reduced, and the supercooling degree of the sodium chloride can be eliminated.
Preferably, the thickening agent is micro-nano fibers, starch or pulp fibers.
By adopting the technical scheme, the micro-nano fiber, the starch or the paper pulp fiber is selected as the thickening agent and added into the composite phase change material system, so that the relative motion of the fluid can be hindered, the heat stored and released by the phase change material is improved, the phase stratification phenomenon is reduced, the materials are cheap, and the cost is reduced.
Preferably, the nucleating agent is borax.
By adopting the technical scheme, borax is selected as a nucleating agent, and crystallization is started when a mirabilite composite phase-change material system is condensed to a condensation point, so that timely phase change is realized, and timely release and utilization of heat are realized.
In a second aspect, the application provides a crystal controllable growth method of a mirabilite composite phase-change material system, which adopts the following technical scheme:
a crystal controllable growth method of a mirabilite composite phase-change material system comprises the following steps:
s1, preparing molten mirabilite-based composite phase-change material system
Respectively weighing quantitative sodium sulfate decahydrate and quantitative sodium carbonate decahydrate, uniformly stirring, sequentially adding 4% of sodium chloride, 1-4% of carbon fiber or starch or paper pulp fiber and 1-4% of borax, uniformly mixing, sealing and bottling the mixed solid ingredients, heating in a water bath at 50 ℃, and stirring for 1 hour until the mixed solid ingredients are completely melted to obtain a molten mirabilite-based composite phase change material system;
s2, preparing a mirabilite-based composite phase-change liquid system
Adding 31.64% of deionized water into the molten mirabilite-based composite phase-change system obtained in the step 1, and completely dissolving at 50 ℃ to obtain a mirabilite-based composite phase-change liquid system;
s3, cooling and crystallizing
And (3) determining the water content of the crystal according to the required heat release quantity, and controlling the cooling rate to cool the mirabilite-based composite phase-change liquid system obtained in the step (2) to a specific temperature.
By adopting the technical scheme, various components required for preparation are mixed and then bottled, the mixture is heated in water bath and stirred at the same time to obtain a molten mirabilite-based composite phase-change material system, the molten mirabilite-based composite phase-change material system is dissolved in water to obtain a mirabilite-based composite phase-change liquid system, and sodium sulfate crystal hydrated salts with different water contents can be obtained by controlling the cooling rate and cooling to a specific temperature; in addition, in the whole process steps, the phase change is small in size, non-toxic, non-volatile, stable in performance, good in repeatability and convenient and quick to operate.
Preferably, the mass part ratio of the sodium sulfate decahydrate to the sodium carbonate decahydrate is 9: 1.
By adopting the technical scheme, a large amount of experimental data prove that when the ratio of the sodium sulfate decahydrate to the sodium carbonate decahydrate is in the range, the heat storage and release effects of the composite phase-change material system are optimal.
Preferably, bottling the sodium sulfate decahydrate solid, heating in a water bath and stirring, keeping the temperature at 50-90 ℃, completely dissolving and slowly dehydrating, keeping the temperature at 100 ℃, and performing heat preservation and drying until complete dehydration to obtain the anhydrous sodium sulfate crystal.
Through adopting above-mentioned technical scheme, with ten water sodium sulfate bottle back alone, the limit water bath heating is stirred simultaneously, carries out heat preservation drying dehydration under specific temperature, obtains anhydrous sodium sulfate crystal, has in fact to be directly converted into the sodium sulfate by ten water sodium sulfate to in-service need, operating procedure is convenient, swift and labour saving and time saving.
In summary, the present application has the following beneficial effects:
1. because the main heat storage agent and the secondary heat storage agent are adopted for storing heat at the same time, the heat storage performance of the composite phase-change material system is enhanced; the thickening agent can block the relative movement of the fluid body, and the effect of preventing phase delamination of the phase change material is achieved; the nucleating agent enables the composite phase-change material system to timely generate phase change when reaching a condensation point, the two components are added, the phenomena of supercooling and phase layering of the composite phase-change material system are eliminated, the service life of the phase-change material is effectively prolonged, the phase-change temperature of the composite phase-change material system is adjusted to be 10-30 ℃, the phase-change reversibility is good, and the composite phase-change material system has a good energy storage effect.
2. In this application, preferably micro-nano fiber, starch or paper pulp fiber add into compound phase change material system as the viscous agent, can hinder the relative motion of mobile, not only make phase change material storage, the heat of release improve, reduce the phase stratification phenomenon, and these materials are substantial in price, have reduced the cost.
3. According to the method, the mirabilite-based composite phase-change liquid system is cooled to a specific temperature by controlling the cooling rate, so that sodium sulfate crystallized hydrated salts with different water contents are obtained, and the heat absorbed and released by the sodium sulfate crystallized hydrated salts is different due to different water contents, so that the heat release of crystallization is controllable; in addition, in the whole process steps, the phase change is small in size, non-toxic, non-volatile, stable in performance, good in repeatability and convenient and quick to operate.
Detailed Description
The present application will be described in further detail with reference to examples.
Examples
Example 1
Preparation of Na2SO4·10H2O crystal
According to Na2SO4·10H2O：Na2CO3·10H2Weighing Na according to the mass part ratio of O to 9:12SO4·10H2O and Na2CO3·10H2O, uniformly stirring, sequentially adding 4% of sodium chloride, 1-4% of carbon fiber or starch or paper pulp fiber and 1-4% of borax in proportion to the whole composite phase change material system, uniformly mixing, sealing the mixed solid ingredients in a sample bottle, magnetically stirring for 1 hour in a constant-temperature water bath kettle at 50 ℃ until the mixed solid ingredients are completely melted to obtain a molten mirabilite-based composite phase change material system, adding 31.64% of deionized water, and keeping the temperatureAt 50 ℃ under the action of Na2SO4·10H2Completely dissolving O to obtain a mirabilite-based composite phase-change liquid system, cooling to 10 ℃ at a cooling rate of 0.1-1 ℃/min, crystallizing to obtain Na2SO4·10H2And (4) O crystals.
Example 2
Preparation of Na2SO4·8H2O crystal
According to Na2SO4·10H2O：Na2CO3·10H2Weighing Na according to the mass part ratio of O to 9:12SO4·10H2O and Na2CO3·10H2O, uniformly stirring, sequentially adding 4% of sodium chloride, 1-4% of carbon fiber or starch or paper pulp fiber and 1-4% of borax in proportion to the whole composite phase change material system, uniformly mixing, sealing the mixed solid ingredients in a sample bottle, magnetically stirring for 1 hour in a constant-temperature water bath kettle at 50 ℃ until the mixed solid ingredients are completely melted to obtain a molten-state mirabilite-based composite phase change material system, adding 31.64% of deionized water, keeping the temperature at 50 ℃, and allowing Na to be dissolved2SO4·10H2Completely dissolving O to obtain a mirabilite-based composite phase-change liquid system, transferring the mirabilite-based composite phase-change liquid system into a pressurizable sample bottle, keeping the temperature of the pressurizable sample bottle at 30-40 ℃, pressurizing to 0.5-1.5 Mpa, cooling to 20 ℃ at the cooling rate of 3-5 ℃/min, and crystallizing to obtain Na2SO4·8H2And (4) O crystals.
Example 3
Preparation of Na2SO4·7H2O crystal
According to Na2SO4·10H2O：Na2CO3·10H2Weighing Na according to the mass part ratio of O to 9:12SO4·10H2O and Na2CO3·10H2O, uniformly stirring, sequentially adding 4% of sodium chloride, 1-4% of carbon fiber or starch or paper pulp fiber and 1-4% of borax in the ratio of the whole composite phase change material system, uniformly mixing, sealing the mixed solid ingredients in a sample bottle, and magnetically stirring for 1h in a constant-temperature water bath kettle at 50 DEG CMelting completely to obtain molten Natrii sulfas based composite phase change material system, adding 31.64% deionized water, maintaining temperature at 50 deg.C to allow Na2SO4·10H2Completely dissolving O to obtain a mirabilite-based composite phase-change liquid system, transferring the mirabilite-based composite phase-change liquid system into a capillary tube with the outer diameter of 0.3-0.5 mm, keeping the temperature of the capillary tube at 30-40 ℃, cooling to 15 ℃ at the cooling rate of 1-3 ℃/min, crystallizing to obtain Na2SO4·7H2And (4) O crystals.
Example 4
Preparation of Na2SO4Crystal
Mixing Na2SO4·10H2Placing the O solid in a sample bottle with an opening diameter of 2-5 cm, magnetically stirring in a constant-temperature water bath kettle, keeping the temperature at 50-90 ℃, completely dissolving and slowly dehydrating, keeping the temperature at 100 ℃ in the constant-temperature water bath kettle, and keeping the temperature and drying at the temperature till complete dehydration to obtain Na2SO4And (4) crystals.
Example 5
Weighing 26.5% of Na by mass relative to the whole composite phase-change material system2SO4With 2.47% of Na2CO3And uniformly mixing, sequentially adding 4% of sodium chloride, 1-4% of carbon fiber or starch or paper pulp fiber and 1-4% of borax, which account for the whole composite phase change material system, uniformly mixing, hermetically placing the mixed solid ingredients into a sample bottle, adding 71.065-75% of deionized water, and sealing the sample bottle. Magnetically stirring in a 50 deg.C constant temperature water bath for 1 hr until completely melted to obtain a Natrii sulfas-based composite phase-change liquid system, cooling to about 10 deg.C at a cooling rate of 0.1-1 deg.C/min, crystallizing to obtain Na2SO4·10H2And (4) O crystals.
Performance test
DSC test
Determining the crystal form of the sodium sulfate hydrate salt crystal prepared in the embodiment by using an in-situ single crystal x-ray diffractometer; and carrying out thermal performance test on the phase change material sample by using a differential scanning calorimeter, and determining the enthalpy value and the weight loss condition of the material.
A200F 3 Differential Scanning Calorimeter (DSC) manufactured by Germany NETZSCH company is adopted to test the DSC curve of the composite phase change energy storage material, the temperature rise speed is 5 ℃/min under the nitrogen atmosphere (50mL/min), and the gram number of a sample is 2-8 g.
TABLE 1 heat enthalpy value and weight loss condition table of phase change material
| Exothermic value/(J/g) | Weight loss/% | |
| Example 1 | 239.3 | 55.89 |
| Example 2 | 191.4 | 44.71 |
| Example 3 | 167.5 | 39.13 |
| Example 4 | － | 56 |
| Example 5 | 239.3 | 55.89 |
It can be seen from table 1 that the crystalline hydrated salts with different water contents release different amounts of heat, and the weight loss conditions are completely different, and the more the water content is, the more the heat is released, and the higher the weight loss rate is.
Combining examples 1 and 5, and table 1, it can be seen that Na was produced using sodium sulfate decahydrate and sodium carbonate decahydrate2SO4·10H2O crystal and Na obtained by mixing sodium sulfate and sodium carbonate2SO4·10H2Compared with O, the heat release value and the weight loss rate of the crystalline hydrated salt are not changed, which fully indicates that the crystalline hydrated salt with different water contents prepared by the components and the method has stable performance and obvious heat storage effect.
Example 4 can show that anhydrous sodium sulfate crystal is obtained by complete dehydration of sodium sulfate decahydrate, the weight loss rate is identical with the theoretical value (55.9%), and the stability of the crystal structure of sodium sulfate decahydrate and the crystal structure of anhydrous sodium sulfate is ensured.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. A mirabilite composite phase-change material system is characterized by comprising the following raw materials in parts by weight: 85-90% of a main heat storage agent, 1-10% of a secondary heat storage agent, 1-4% of a modifier, 0.2-1% of a thickening agent, 1-4% of a nucleating agent and 30-32% of a hydrosolvent.
2. The mirabilite composite phase-change material system of claim 1, wherein the main heat storage agent is sodium sulfate decahydrate.
3. The mirabilite composite phase-change material system of claim 1, wherein the secondary heat storage agent is sodium carbonate decahydrate.
4. The mirabilite composite phase-change material system of claim 1, wherein the modifier is sodium chloride.
5. The mirabilite composite phase-change material system according to claim 1, wherein the thickening agent is micro-nanofiber, starch or pulp fiber.
6. The mirabilite composite phase-change material system of claim 1, wherein the nucleating agent is borax.
7. A crystal controllable growth method of a mirabilite composite phase-change material system is characterized by comprising the following steps:
s1, preparing molten mirabilite-based composite phase-change material system
Respectively weighing quantitative sodium sulfate decahydrate and quantitative sodium carbonate decahydrate, uniformly stirring, sequentially adding 4% of sodium chloride, 1-4% of carbon fiber or starch or paper pulp fiber and 1-4% of borax, uniformly mixing, sealing and bottling the mixed solid ingredients, heating in a water bath at 50 ℃, and stirring for 1 hour until the mixed solid ingredients are completely melted to obtain a molten mirabilite-based composite phase change material system;
s2, preparing a mirabilite-based composite phase-change liquid system
Adding 31.64% of deionized water into the molten mirabilite-based composite phase-change system obtained in the step 1, and completely dissolving at 50 ℃ to obtain a mirabilite-based composite phase-change liquid system;
s3, cooling and crystallizing
And (3) determining the water content of the crystal according to the required heat release quantity, and controlling the cooling rate to cool the mirabilite-based composite phase-change liquid system obtained in the step (2) to a specific temperature.
8. The controllable crystal growth method of a mirabilite composite phase-change material system according to claim 7, characterized in that the mass part ratio of the sodium sulfate decahydrate to the sodium carbonate decahydrate is 9: 1.
9. The controllable crystal growth method of the compound mirabilite phase-change material system according to claim 7 or 8, characterized in that the sodium sulfate decahydrate solid is bottled, heated in water bath and stirred, the temperature is kept at 50-90 ℃, after the sodium sulfate decahydrate solid is completely dissolved and slowly dehydrated, the temperature is kept at 100 ℃, and heat preservation and drying are carried out until the sodium sulfate anhydrous crystal is completely dehydrated, so that the anhydrous sodium sulfate crystal is obtained.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102585774A (en) * | 2012-01-08 | 2012-07-18 | 郑小玲 | Composite phase-change heat storage material |
| CN103059816A (en) * | 2012-12-18 | 2013-04-24 | 天津科技大学 | Efficient phase change energy storage materials and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102585774A (en) * | 2012-01-08 | 2012-07-18 | 郑小玲 | Composite phase-change heat storage material |
| CN103059816A (en) * | 2012-12-18 | 2013-04-24 | 天津科技大学 | Efficient phase change energy storage materials and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 蒋自鹏等: "物理法制备芒硝基复合相变材料及其性能研究", 人工晶体学报, vol. 44, no. 12, pages 3639 - 3645 * |
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