Preparation method of phase change energy storage wallboard
By loading phase change materials onto a porous carrier and encapsulating them in hollow fibers/hollow microspheres, the problem of poor encapsulation of phase change materials in buildings is solved, improving energy storage efficiency and mechanical property stability, and adapting to volume changes during the phase change process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG YASHA DECORATION
- Filing Date
- 2023-09-26
- Publication Date
- 2026-07-03
AI Technical Summary
In existing technologies, the encapsulation effect of phase change materials in buildings is poor, resulting in low energy storage efficiency and affected mechanical strength, and they are prone to leakage or loss during processing.
A porous carrier is used to adsorb phase change materials and encapsulate them in hollow fibers or hollow microspheres. The reactants generate solidified substances to seal the pores and form an encapsulation. The structural strength of the hollow fibers/hollow microspheres is used to maintain the overall mechanical properties of the wall panel and adapt to the volume changes during the phase change process.
This technology enables uniform dispersion and stable encapsulation of phase change materials, improving the stability and durability of energy storage performance, reducing changes in mechanical strength, adapting to volume changes during the phase change process, and reducing internal stress.
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Figure SMS_1
Abstract
Description
Technical Field
[0001] This invention relates to the field of building materials technology, and more specifically to a method for preparing a phase change energy storage wall panel. Background Technology
[0002] Improving energy efficiency is a crucial issue for sustainable development in modern society. Building energy consumption accounts for a significant proportion of total energy consumption in modern society; in some countries, the building sector consumes almost one-third of the total social energy. Therefore, improving building energy efficiency is invaluable for enhancing the overall energy efficiency of society. Approaches to improving building energy efficiency can be categorized into passive and active methods. Passive methods utilize materials with low thermal conductivity to enhance the building's insulation capabilities, thereby improving its energy efficiency. Active methods, on the other hand, leverage materials with energy storage capabilities to enhance the building's energy efficiency.
[0003] Solid-liquid phase change materials are commonly used in the construction industry. These materials undergo a state change during the absorption of heat energy to store it, and release the stored heat energy during the recovery process. Because phase change materials transform into a liquid state during use, measures need to be taken to encapsulate them to prevent leakage.
[0004] Patent document CN102535735B discloses a method for preparing phase change energy storage gypsum wall panels. This method uses gypsum powder as the main raw material. The phase change material is melted, poured into a rectangular plastic bag, sealed, laid flat, and cooled to solidify into a phase change material board. The sealed phase change material board is then placed inside a mold filled with gypsum slurry. After the sample hardens, the mold is removed to obtain a phase change energy storage gypsum wall panel with gypsum board on both sides and a middle layer of sealed phase change material board in a plastic bag. This method is simple and prevents leakage of the phase change material. However, since the phase change material is sandwiched in the middle of the wall panel, heat transfer needs to be through the gypsum board on both sides, resulting in a slight deficiency in energy storage efficiency.
[0005] Patent document CN102746824A discloses a method for preparing a diatomaceous earth powder composite phase change material, specifically as follows: 1. Weigh an organic phase change material; 2. Heat the weighed diatomaceous earth to 140℃~200℃ and hold for 1.5~2 hours; then heat the weighed organic phase change material to 80℃~100℃, then stir the heated diatomaceous earth and organic phase change material evenly, dry at 20℃~40℃ to constant weight, then pulverize and grind, and pass through a 0.075mm standard square-hole sieve to obtain the composite phase change material of this invention. This method adsorbs the phase change material through diatomaceous earth, allowing it to be used as a filler to uniformly disperse the phase change material in the building structure. However, when applied to resin- and filler-based wood-plastic and stone-plastic products, the resin melting temperature during extrusion is usually much higher than the melting point of the phase change material, causing the phase change material adsorbed in the diatomaceous earth to easily dissipate during processing, affecting the energy storage effect. Summary of the Invention
[0006] To address the aforementioned problems, this invention provides a method for preparing a phase change energy storage wall panel. This method enables the phase change material to be uniformly dispersed in the wall panel structure, and the encapsulation effect of the phase change material is good.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A method for preparing a phase change energy storage wall panel includes the following steps:
[0009] S1. Prepare a porous carrier and a phase change material. Heat and melt the phase change material that can be converted from solid to liquid, and mix it with the porous carrier. Under negative pressure or vacuum conditions, allow the porous carrier to adsorb the phase change material.
[0010] S2. After grinding and sieving the porous carrier adsorbed with phase change material, the carrier particles are obtained. The carrier particles are mixed evenly with solid reactant A, and then hollow fiber or hollow microspheres are added and mixed and stirred so that the hollow fiber or hollow microspheres are filled with carrier particles and reactant A. Excess carrier particles and curing agent are removed through a sieve to obtain the filler.
[0011] S3. Immerse the filler in liquid reactant B, so that reactant B comes into contact with reactant A to react and generate a solidified product. Then remove reactant B to obtain the encapsulated body.
[0012] S4. The wall panel mixture containing the matrix resin and the encapsulant is extruded and molded through an extruder and a die to obtain a phase change energy storage wall panel; the matrix resin is a thermoplastic resin.
[0013] This invention first uses a porous carrier to adsorb and load the phase change material, then grinds the porous carrier into carrier microparticles with a small particle size, and fills the carrier microparticles into hollow fibers or hollow microspheres. Finally, the solidified product generated by reactant A and reactant B is used to seal the pores of the hollow fibers / hollow microspheres, so that the phase change material is encapsulated in the hollow fibers / hollow microspheres. After encapsulation, firstly, the phase change material (PCM) is less likely to leak out of the hollow fiber / hollow microspheres in solid form, resulting in a high retention rate of PCM within the encapsulated body during mixing or resin melting. Secondly, the structural strength of the filler is mainly provided by the shell formed by the hollow fiber or hollow microspheres. The external structure of the filler remains largely unchanged after the PCM melts, thus the overall mechanical strength of the wall panel changes relatively little. If a porous carrier loaded with PCM is directly added to the wall panel raw material, the melting of the PCM will alter the internal structural characteristics of the wall panel to some extent, thereby reducing the mechanical strength of the wall panel. Thirdly, the hollow fiber / hollow microspheres naturally retain a certain cavity, which can adapt to the volume changes during the PCM phase change process, reducing internal stress. In step S2 of this invention, solid reactant A is mixed with carrier microparticles and filled into hollow fibers / hollow microspheres. This ensures that once reactant B penetrates into the hollow fibers / hollow microspheres through the pores in step S3, it will come into contact with reactant A. Subsequently, a solidified material is formed based on the pores. After the solidified material is formed, it seals the pores, thereby stopping or slowing down the subsequent reaction, preserving the liquid characteristics of the system, and facilitating the separation of the encapsulated body.
[0014] Furthermore, the phase change material is selected from saturated fatty acids or alkanes with 18 to 35 carbon atoms.
[0015] Further, reactant A is a water glass curing agent, and reactant B is a sodium silicate solution or a potassium silicate solution. Upon contact with the water glass solution, the water glass curing agent rapidly generates silica gel precipitate, sealing the pores. After dehydration and curing, the silica gel precipitate forms a solid structure based on silicon oxide, reducing or sealing the pore openings. The water glass curing agent can be fluorosilicates, polyphosphates, etc. The curing agents for sodium silicate and potassium silicate differ; therefore, the appropriate water glass curing agent should be selected during application.
[0016] Further, reactant A is a curing agent or initiator, and reactant B contains a resin that can be cured under the action of reactant A or a precursor substance that can generate a solid resin under the action of reactant A. In one embodiment, reactant A is a curing agent, and reactant B is a resin containing crosslinkable groups (e.g., epoxy resin). When reactant A and reactant B come into contact, the resin forms a solid precipitate at the pores due to crosslinking. This type of solid precipitate is usually non-thermally fusible and can seal the pores during subsequent wall panel processing. In another embodiment, reactant A is an initiator, and reactant B contains polymerizable groups (e.g., acrylate monomers). When reactant B comes into contact with reactant A, a polymerization reaction occurs to generate a resin precipitate.
[0017] Furthermore, the particle size of the carrier microparticles does not exceed 75 μm.
[0018] Furthermore, the porous carrier is prepared by modifying one or more of diatomaceous earth, expanded perlite, or bentonite with a silane coupling agent.
[0019] Furthermore, the hollow fibers or hollow microspheres are made of glass or resin. Preferably, the hollow fibers / hollow microspheres are made of glass, and when the hollow fibers / hollow microspheres are made of resin, it should be ensured that the resin does not melt or decompose during the melt processing of the wall panel.
[0020] Furthermore, the matrix resin is selected from one or more of PE, PVC, PP, ABS, PS, and PLA.
[0021] Furthermore, the wall panel mixture contains the following components by weight: 40-50 parts PVC, 15-25 parts encapsulant, 60-70 parts filler, 1-2 parts lubricant, 1.5-2.5 parts stabilizer, 3-5 parts plasticizer, and 0.3-0.5 parts antioxidant.
[0022] Further, in step S4, the matrix resin is first mixed with the encapsulant and granulated by the first extruder, and then the material particles are mixed with the remaining components of the wall panel mixture and extruded by the second extruder to obtain the phase change energy storage wall panel.
[0023] In summary, the following beneficial effects can be achieved by applying the solution of the present invention:
[0024] 1. This invention encapsulates phase change material in hollow fibers / hollow microspheres to form an encapsulation. During mixing, melting, processing, and subsequent use, the phase change material is not easily leaked out of the encapsulation, thus confining the phase change process inside the encapsulation and ensuring the stability and durability of the wall panel's energy storage performance.
[0025] 2. This invention uses hollow fibers / hollow microspheres as the outer shell material to confine the phase change material inside. The structural strength of the filler is mainly provided by the outer shell. After the phase change material melts, the external structure of the filler basically does not change. Therefore, the overall mechanical strength of the wall panel changes little. If a porous carrier loaded with phase change material is directly added to the wall panel raw material, the phase change material will change the internal structural characteristics of the wall panel to a certain extent after melting, thereby reducing the mechanical strength of the wall panel.
[0026] 3. In this invention, the phase change material is first loaded onto a porous carrier, and then the porous carrier is encapsulated in hollow fibers / hollow microspheres. During the filling process of the porous carrier, a certain cavity will naturally be left. The cavity structure can adapt to the volume change of the phase change material during the phase change process and reduce internal stress. Detailed Implementation
[0027] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0028] Example 1
[0029] S1. Take diatomaceous earth that has passed through a 100-mesh sieve and place it in a high-speed mixer. Heat it to 80°C and spray it with 3% by weight of silane coupling agent while stirring. After stirring for 30 minutes, modified diatomaceous earth is obtained. Heat the modified diatomaceous earth to 90°C and heat the paraffin wax to 80°C to melt it. Then mix the modified diatomaceous earth and paraffin wax so that the paraffin wax impregnates the diatomaceous earth. Stir under vacuum at 80°C for 6 hours to obtain modified diatomaceous earth adsorbed with paraffin wax.
[0030] S2. Grind the modified diatomaceous earth adsorbed with paraffin and pass it through a 200-mesh sieve. Take the sieve material to obtain diatomaceous earth microparticles. Mix the diatomaceous earth microparticles with sodium fluorosilicate in a ratio of 5:1. Stir until uniform to obtain a mixed powder. Then mix the mixed powder with hollow glass fiber for 1 hour. Then sieve off the excess mixed powder to obtain the filler.
[0031] S3. Place the filler in sodium silicate solution and immerse it for 30 minutes. Then filter out the solution and dry the solid to obtain the encapsulated body.
[0032] S4. Take 40 parts of PVC and 15 parts of encapsulant, mix and stir them and put them into the first extruder to make material granules. Then mix the material granules with 60 parts of calcium carbonate filler, 0.5 parts of paraffin wax, 0.8 parts of stearic acid, 2 parts of calcium zinc stabilizer, 4 parts of plasticizer and 0.4 parts of antioxidant to obtain wall panel mixture. Put the wall panel mixture into the second extruder and extrude it through the die to obtain phase change energy storage wall panel.
[0033] Example 2
[0034] S1. Take diatomaceous earth that has passed through a 100-mesh sieve and place it in a high-speed mixer. Heat it to 80°C and spray it with 3% by weight of silane coupling agent while stirring. After stirring for 30 minutes, modified diatomaceous earth is obtained. Heat the modified diatomaceous earth to 90°C and heat the paraffin wax to 80°C to melt it. Then mix the modified diatomaceous earth and paraffin wax so that the paraffin wax impregnates the diatomaceous earth. Stir under vacuum at 80°C for 6 hours to obtain modified diatomaceous earth adsorbed with paraffin wax.
[0035] S2. Grind the modified diatomaceous earth adsorbed with paraffin and pass it through a 200-mesh sieve. Take the sieve material to obtain diatomaceous earth microparticles. Mix the diatomaceous earth microparticles with sodium fluorosilicate in a ratio of 5:1. Stir until uniform to obtain a mixed powder. Then mix the mixed powder with hollow glass fiber for 1 hour. Then sieve off the excess mixed powder to obtain the filler.
[0036] S3. Place the filler in sodium silicate solution and immerse it for 30 minutes. Then filter out the solution and dry the solid to obtain the encapsulated body.
[0037] S4. Take 40 parts of PE and 15 parts of encapsulant, mix and stir them and put them into the first extruder to make material granules. Then mix the material granules with 60 parts of calcium carbonate filler, 0.5 parts of paraffin wax, 0.5 parts of stearic acid, 1.5 parts of calcium zinc stabilizer and 0.5 parts of antioxidant to obtain wall panel mixture. Put the wall panel mixture into the second extruder and extrude it through the die to obtain phase change energy storage wall panel.
[0038] Example 3
[0039] S1. Take diatomaceous earth that has passed through a 100-mesh sieve and place it in a high-speed mixer. Heat it to 80°C and spray it with 3% by weight of silane coupling agent while stirring. After stirring for 30 minutes, modified diatomaceous earth is obtained. Heat the modified diatomaceous earth to 90°C and heat the paraffin wax to 80°C to melt it. Then mix the modified diatomaceous earth and paraffin wax so that the paraffin wax impregnates the diatomaceous earth. Stir under vacuum at 80°C for 6 hours to obtain modified diatomaceous earth adsorbed with paraffin wax.
[0040] S2. Grind the modified diatomaceous earth with adsorbed paraffin and pass it through a 100-mesh sieve. Take the sieve material to obtain diatomaceous earth microparticles. Mix the diatomaceous earth microparticles with sodium fluorosilicate in a ratio of 5:1. Stir until uniform to obtain a mixed powder. Then mix the mixed powder with hollow glass fiber for 1 hour. Then sieve away the excess mixed powder to obtain the filler.
[0041] S3. Place the filler in sodium silicate solution and immerse it for 30 minutes. Then filter out the solution and dry the solid to obtain the encapsulated body.
[0042] S4. Take 40 parts of PVC and 15 parts of encapsulant, mix and stir them and put them into the first extruder to make material granules. Then mix the material granules with 60 parts of calcium carbonate filler, 0.5 parts of paraffin wax, 0.8 parts of stearic acid, 2 parts of calcium zinc stabilizer, 4 parts of plasticizer and 0.4 parts of antioxidant to obtain wall panel mixture. Put the wall panel mixture into the second extruder and extrude it through the die to obtain phase change energy storage wall panel.
[0043] Example 4
[0044] S1. Take diatomaceous earth that has passed through a 100-mesh sieve and place it in a high-speed mixer. Heat it to 80°C and spray it with 3% by weight of silane coupling agent while stirring. After stirring for 30 minutes, modified diatomaceous earth is obtained. Heat the modified diatomaceous earth to 90°C and heat the paraffin wax to 80°C to melt it. Then mix the modified diatomaceous earth and paraffin wax so that the paraffin wax impregnates the diatomaceous earth. Stir under vacuum at 80°C for 6 hours to obtain modified diatomaceous earth adsorbed with paraffin wax.
[0045] S2. Grind the modified diatomaceous earth adsorbed with paraffin and pass it through a 200-mesh sieve. Take the sieve material to obtain diatomaceous earth microparticles. Mix the diatomaceous earth microparticles with a photoinitiator. The ratio of diatomaceous earth microparticles to photoinitiator is 10:1. Stir evenly to obtain a mixed powder. Then mix the mixed powder with hollow glass fiber for 1 hour. Then sieve off the excess mixed powder to obtain the filler.
[0046] S3. Impregnate the filler with an equal volume of methyl methacrylate solution for 10 minutes, then heat to 40°C and treat with ultraviolet light for 15 minutes. After washing and drying the solid, the encapsulated body is obtained.
[0047] S4. Take 40 parts of PVC and 15 parts of encapsulant, mix and stir them and put them into the first extruder to make material granules. Then mix the material granules with 60 parts of calcium carbonate filler, 0.5 parts of paraffin wax, 0.8 parts of stearic acid, 2 parts of calcium zinc stabilizer, 4 parts of plasticizer and 0.4 parts of antioxidant to obtain wall panel mixture. Put the wall panel mixture into the second extruder and extrude it through the die to obtain phase change energy storage wall panel.
[0048] Comparative Example 1
[0049] S1. Take diatomaceous earth that has passed through a 100-mesh sieve and place it in a high-speed mixer. Heat it to 80°C and spray it with 3% by weight of silane coupling agent under stirring conditions. After stirring for 30 minutes, modified diatomaceous earth is obtained. Heat the modified diatomaceous earth to 90°C and then stir it under vacuum at 80°C for 6 hours.
[0050] S2. Grind the modified diatomaceous earth and pass it through a 200-mesh sieve. Take the sieve material to obtain diatomaceous earth microparticles. Mix the diatomaceous earth microparticles with sodium fluorosilicate. The ratio of diatomaceous earth microparticles to sodium fluorosilicate is 5:1. Stir evenly to obtain a mixed powder. Then mix the mixed powder with hollow glass fiber for 1 hour. Then sieve the excess mixed powder to obtain the filler.
[0051] S3. Place the filler in sodium silicate solution and immerse it for 30 minutes. Then filter out the solution and dry the solid to obtain the encapsulated body.
[0052] S4. Take 40 parts of PVC and 15 parts of encapsulant, mix and stir them and put them into the first extruder to make material granules. Then mix the material granules with 60 parts of calcium carbonate filler, 0.5 parts of paraffin wax, 0.8 parts of stearic acid, 2 parts of calcium zinc stabilizer, 4 parts of plasticizer and 0.4 parts of antioxidant to obtain wall panel mixture. Put the wall panel mixture into the second extruder and extrude it through the mold to obtain stone plastic wall panel.
[0053] Comparative Example 2
[0054] S1. Take diatomaceous earth that has passed through a 100-mesh sieve and place it in a high-speed mixer. Heat it to 80°C and spray it with 3% by weight of silane coupling agent while stirring. After stirring for 30 minutes, modified diatomaceous earth is obtained. Heat the modified diatomaceous earth to 90°C and heat the paraffin wax to 80°C to melt it. Then mix the modified diatomaceous earth and paraffin wax so that the paraffin wax impregnates the diatomaceous earth. Stir under vacuum at 80°C for 6 hours to obtain modified diatomaceous earth adsorbed with paraffin wax.
[0055] S2. Grind the modified diatomaceous earth adsorbed with paraffin and pass it through a 200-mesh sieve. Take the sieve material to obtain diatomaceous earth microparticles. Then mix the diatomaceous earth microparticles with hollow glass fiber and stir for 1 hour. Then sieve away the excess diatomaceous earth microparticles to obtain the filler.
[0056] S3. Place the filler in sodium silicate solution and immerse it for 30 minutes. Then filter out the solution and dry the solid to obtain the encapsulated body.
[0057] S4. Take 40 parts of PVC and 15 parts of encapsulant, mix and stir them and put them into the first extruder to make material granules. Then mix the material granules with 60 parts of calcium carbonate filler, 0.5 parts of paraffin wax, 0.8 parts of stearic acid, 2 parts of calcium zinc stabilizer, 4 parts of plasticizer and 0.4 parts of antioxidant to obtain wall panel mixture. Put the wall panel mixture into the second extruder and extrude it through the die to obtain phase change energy storage wall panel.
[0058] Performance Testing: A comparative thermal insulation experiment was conducted on the wall panels prepared in the examples and comparative examples under the following conditions: room temperature approximately 20°C; a 45°C heat source was provided to the bottom panel; the temperature of the top panel was recorded every 5 minutes for 20 minutes; then the heat source was removed, and the temperature of the top panel was recorded every 10 minutes for 30 minutes. Nine measurement points were selected on the top of the panel each time the temperature was recorded, and the average value was calculated. The experimental results are shown in Table 1.
[0059] Table 1
[0060]
[0061] According to the data in Table 1, the heating and cooling rates of the boards prepared in Examples 1-4 are relatively slower than those in Comparative Example 1. This is because some alkanes with fewer carbon atoms in the paraffin wax undergo a phase change process during heating. This phase change process absorbs heat, and when the heat source is removed, the alkanes solidify and release heat, which can slow down the cooling rate of the board and achieve an energy storage effect. Among them, the energy storage effect of Example 4 is slightly worse than that of Comparative Examples 1-3, possibly because a 100-mesh sieve was used when screening the diatomaceous earth particles, resulting in a larger average particle size of the diatomaceous earth, which has an adverse effect on the filling of hollow glass fibers. Comparative Example 2 added paraffin wax but did not perform pore sealing treatment, and its energy storage performance is between that of Comparative Example 1 and the examples, possibly because some of the paraffin wax adsorbed in the diatomaceous earth was lost.
[0062] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for preparing a phase change energy storage wall panel, comprising the following steps: S1. Prepare a porous carrier and a phase change material. Heat and melt the phase change material that can be converted from solid to liquid, and mix it with the porous carrier. Under negative pressure or vacuum conditions, allow the porous carrier to adsorb the phase change material. S2. After grinding and sieving the porous carrier adsorbed with phase change material, the carrier particles are obtained as the sieve undersize. The carrier particles are mixed evenly with solid reactant A, and then hollow fiber or hollow microspheres are added and mixed and stirred so that the hollow fiber or hollow microspheres are filled with carrier particles and reactant A. Excess carrier particles and reactant A are removed through a sieve to obtain the filler. S3. Immerse the filler in liquid reactant B, so that reactant B comes into contact with reactant A to react and generate a solidified product. Then remove reactant B to obtain the encapsulated body. S4. The wall panel mixture containing the matrix resin and the encapsulated body is extruded and molded through an extruder and a die to obtain a phase change energy storage wall panel; the matrix resin is a thermoplastic resin.
2. The method of claim 1, wherein: The phase change material is selected from saturated fatty acids or alkanes with 18 to 35 carbon atoms.
3. The method of claim 1, wherein: Reactant A is a water glass curing agent, and reactant B is a sodium water glass solution or a potassium water glass solution.
4. The method of claim 1, wherein: The reactant A is a curing agent or initiator, and the reactant B contains a resin that can be cured under the action of reactant A or a precursor substance that can generate a solid resin under the action of reactant A.
5. The method for preparing a phase change energy storage wall panel according to claim 1, characterized in that: The particle size of the carrier microparticles does not exceed 75 μm.
6. The method for preparing a phase change energy storage wall panel according to claim 1, characterized in that: The porous carrier is prepared by modifying one or more of diatomaceous earth, expanded perlite or bentonite with a silane coupling agent.
7. The method for preparing a phase change energy storage wall panel according to claim 1, characterized in that: The hollow fibers or hollow microspheres are made of glass or resin.
8. The method for preparing a phase change energy storage wall panel according to claim 1, characterized in that: The matrix resin is selected from one or more of PE, PVC, PP, ABS, PS, and PLA.
9. The method for preparing a phase change energy storage wall panel according to claim 1, characterized in that: The wall panel mixture contains the following components by weight: 40-50 parts PVC, 15-25 parts encapsulant, 60-70 parts filler, 1-2 parts lubricant, 1.5-2.5 parts stabilizer, 3-5 parts plasticizer, and 0.3-0.5 parts antioxidant.
10. The method for preparing a phase change energy storage wall panel according to claim 1, characterized in that: In step S4, the matrix resin is first mixed with the encapsulant and granulated using a first extruder. Then, the material particles are mixed with the remaining components of the wall panel mixture and extruded using a second extruder to obtain a phase change energy storage wall panel.