Biomass-based phase change energy storage material plate, preparation method and application

Abstract

The present disclosure provides a biomass substrate phase change energy storage material plate, a preparation method and an application thereof, and can be applied to the technical field of building materials and building technology. The method comprises the following steps: performing first encapsulation processing on a phase change composite material by using a predetermined size of an encapsulation shell to obtain a first encapsulation assembly, wherein the inside of the encapsulation shell is a hollow structure, the encapsulation shell comprises one of a raw bamboo shell, a polyvinyl chloride shell and a metal shell, the phase change composite material is prepared from solid paraffin, liquid paraffin and expanded graphite, and the phase change composite material subjected to the encapsulation processing is a liquid phase change composite material before condensation; performing second encapsulation processing on the top and bottom of the first encapsulation assembly by using a tenon-shaped assembly to obtain a second encapsulation assembly; and performing adhesion processing on a plurality of second encapsulation assemblies by using an adhesion material to obtain a biomass substrate phase change energy storage material plate. The biomass substrate phase change energy storage material plate meets the requirement of indoor temperature regulation, and meets the requirements of cost economy, energy saving and environmental protection.

Description

Technical Field

[0001] This disclosure relates to the fields of building materials and building technology, and in particular to a biomass-based phase change energy storage material plate, its preparation method and its application. Background Technology

[0002] Building energy consumption accounts for a large proportion of total energy consumption, with heating and cooling equipment such as air conditioning consuming the largest share. Therefore, seeking to use passive energy storage facilities to reduce the use of such equipment is of great significance for achieving energy conservation and emission reduction. By introducing phase change energy storage technology into the building envelope, the contradiction between the temporal and spatial imbalance between energy consumption and supply can be effectively alleviated.

[0003] In realizing the present invention, the inventors discovered the following defects in the related technologies for phase change energy storage material panels: the phase change material is difficult to encapsulate, and leakage of the phase change material can easily cause structural damage to the interior of the wall; the construction process is relatively complicated, leading to difficulties in practical application; the encapsulation and construction problems increase construction costs to a certain extent, resulting in poor economic and environmental benefits. Summary of the Invention

[0004] In view of the above problems, this disclosure provides a biomass-based phase change energy storage material plate, its preparation method and its application.

[0005] According to the first aspect of this disclosure, a method for preparing a biomass-based phase change energy storage material plate is provided, comprising:

[0006] A first encapsulation process is performed on a phase change composite material using a pre-sized encapsulation shell to obtain a first encapsulation assembly. The encapsulation shell has a hollow internal structure and includes one of a bamboo shell, a polyvinyl chloride shell, and a metal shell. The phase change composite material is prepared from solid paraffin, liquid paraffin, and expanded graphite. The encapsulated phase change composite material is a liquid phase change composite material before condensation.

[0007] A second encapsulation assembly is obtained by using tenon-shaped components to perform a second encapsulation process on the top and bottom of the first encapsulation assembly, wherein the material of the tenon-shaped components is the same as the material of the encapsulation shell; and

[0008] Multiple second encapsulation components are bonded together using an adhesive material to obtain the biomass-based phase change energy storage material plate. The adhesive material includes a connecting material and an adhesive that meet a preset tensile strength.

[0009] According to embodiments of this disclosure, the melting point of the solid paraffin is 45°C-50°C, and the preparation method of the phase change composite material includes:

[0010] The above solid paraffin and the above liquid paraffin are mixed in a first preset ratio and heated until melted to obtain a molten mixed paraffin.

[0011] The expanded graphite was added to the mixed paraffin at a second preset ratio and stirred evenly. After condensation, the phase change composite material with the preset phase change temperature was obtained.

[0012] According to embodiments of this disclosure, when the encapsulation shell is the aforementioned raw bamboo shell, the method for preparing the raw bamboo shell includes:

[0013] The raw bamboo of a predetermined size is immersed in a preservative agent for a predetermined time.

[0014] The soaked raw bamboo is placed in a drying device for drying to obtain raw bamboo shells with a preset moisture content.

[0015] According to embodiments of this disclosure, the preset phase transition temperature of the aforementioned condensed phase change composite material is 16°C-20°C.

[0016] According to embodiments of this disclosure, the connecting materials that meet the preset tensile strength include steel wire and / or hemp rope with a preset diameter requirement.

[0017] According to embodiments of this disclosure, the diameter of the aforementioned shell is 5cm-8cm.

[0018] According to embodiments of this disclosure, the first preset ratio is a mass ratio of solid paraffin to liquid paraffin of 4:6, and the second preset ratio is a mass ratio of expanded graphite to mixed paraffin of 2.5%.

[0019] A second aspect of this disclosure provides a biomass-based phase change energy storage material plate prepared by the method described above.

[0020] According to embodiments of this disclosure, by bonding the above-mentioned material plates side by side in the width direction and assembling and continuing them in the length direction using tenon-shaped components, an assembly plate of biomass-based phase change energy storage material plates of various sizes can be prepared.

[0021] The third aspect of this disclosure provides a biomass-based phase change energy storage wall, which is prepared from the aforementioned biomass-based phase change energy storage material board. The structure of the wall, from the inner wall surface outwards, is as follows:

[0022] Interior surface layer;

[0023] First bonding layer;

[0024] Phase change layer;

[0025] Second bonding layer;

[0026] Structural layers;

[0027] Insulation layer; and

[0028] Exterior finish;

[0029] The phase change layer is composed of the biomass-based phase change energy storage material board, the first bonding layer and the second bonding layer are bonded and shaped with epoxy resin, the insulation layer material includes polyurethane foam material and polystyrene material, and the interior surface layer includes mortar plaster and / or diatomaceous earth coating.

[0030] According to the biomass-based phase change energy storage material plate, preparation method and application provided in this disclosure, a first encapsulation component can be obtained by first encapsulating the phase change composite material with an encapsulation shell of a predetermined size. A second encapsulation component that meets the airtight requirements can be obtained by second encapsulating the top and bottom of the first encapsulation component with tenon-shaped components. Then, multiple second encapsulation components can be bonded together with adhesive materials to obtain biomass-based phase change energy storage material plates of different sizes. Since the biomass-based phase change energy storage material plate has phase change temperature regulation and energy storage functions and thermal insulation functions, and the encapsulation shell is easy to install and disassemble, the biomass-based phase change energy storage material plate meets the requirements of indoor temperature regulation while achieving cost-effectiveness, energy saving and environmental protection. Attached Figure Description

[0031] The foregoing contents, as well as other objects, features, and advantages of this disclosure, will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0032] Figure 1 A flowchart illustrating a method for preparing a biomass-based phase change energy storage material plate according to an embodiment of the present disclosure is shown.

[0033] Figure 2 A schematic diagram of a longitudinal section of a biomass-based phase change energy storage material plate according to an embodiment of the present disclosure is shown.

[0034] Figure 3 This schematic diagram illustrates an hourly temperature comparison of the interior wall with and without phase change energy storage material (PCM) according to an embodiment of the present disclosure.

[0035] Figure 4 A schematic cross-sectional view of a biomass-based phase change energy storage material plate according to an embodiment of the present disclosure is shown.

[0036] Figure 5 A schematic diagram of an assembly plate of a biomass-based phase change energy storage material plate according to an embodiment of the present disclosure is shown; and

[0037] Figure 6 A schematic diagram of a biomass-based phase change energy storage wall according to an embodiment of the present disclosure is shown. Detailed Implementation

[0038] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0039] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0040] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0041] When using expressions such as "at least one of A, B and C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B and C, etc.).

[0042] The inventors discovered that in related technologies, for phase change energy storage material panels, the encapsulation of phase change materials is difficult, and leakage of phase change materials can easily cause structural damage to the interior of the wall; the construction process is relatively cumbersome, leading to difficulties in practical application; the encapsulation and construction problems increase construction costs to a certain extent, resulting in poor economic and environmental benefits. In view of this, this disclosure uses a pre-sized encapsulation shell to perform a first encapsulation treatment on the phase change composite material to obtain a first encapsulation component. A second encapsulation treatment is then performed on the top and bottom of the first encapsulation component using tenon-shaped components, thereby obtaining a second encapsulation component that meets the airtight requirements. Furthermore, multiple second encapsulation components can be bonded together using adhesive materials to obtain biomass-based phase change energy storage material panels of different sizes. Since the biomass-based phase change energy storage material panels have phase change temperature regulation and energy storage functions as well as thermal insulation functions, and the encapsulation shell is easy to install and disassemble, the biomass-based phase change energy storage material panels meet the requirements of indoor temperature control while achieving cost-effectiveness, energy saving, and environmental protection.

[0043] This disclosure provides a biomass-based phase change energy storage material plate, its preparation method, and its application. The method includes: performing a first encapsulation treatment on a phase change composite material using a pre-sized encapsulation shell to obtain a first encapsulation component, wherein the interior of the encapsulation shell is a hollow structure, including one of a bamboo shell, a polyvinyl chloride shell, and a metal shell; the phase change composite material is prepared from solid paraffin, liquid paraffin, and expanded graphite; and the encapsulated phase change composite material is a liquid phase change composite material before condensation. Next, a second encapsulation treatment is performed on the top and bottom of the first encapsulation component using tenon-shaped components to obtain a second encapsulation component, wherein the material of the tenon-shaped components is the same as the material of the encapsulation shell. Finally, multiple second encapsulation components are bonded together using an adhesive material to obtain a biomass-based phase change energy storage material plate, wherein the adhesive material includes a connecting material and an adhesive that meet a preset tensile strength.

[0044] Figure 1 A flowchart illustrating a method for preparing a biomass-based phase change energy storage material plate according to an embodiment of the present disclosure is shown.

[0045] like Figure 1 As shown, the preparation method of the biomass-based phase change energy storage material plate in this embodiment includes operations S110 to S130.

[0046] In operation S110, the phase change composite material is first encapsulated using a pre-sized encapsulation shell to obtain a first encapsulation component. The encapsulation shell has a hollow internal structure and includes one of a bamboo shell, a polyvinyl chloride shell, and a metal shell. The phase change composite material is prepared from solid paraffin, liquid paraffin, and expanded graphite. The encapsulated phase change composite material is a liquid phase change composite material before condensation.

[0047] According to embodiments of this disclosure, the encapsulation shell can be any one of a bamboo shell, a polyvinyl chloride shell, and a metal shell. The cross-sectional shape of the encapsulation shell includes, but is not limited to, a circle, a square, and a rectangle. The phase change composite material can be prepared from solid paraffin wax, liquid paraffin wax, and expanded graphite. The solid paraffin wax can be paraffin wax with a melting point of 45°C-50°C, the liquid paraffin wax can be paraffin wax with a melting point of 2°C-5°C, and expanded graphite can be added as an additive to the mixed paraffin wax obtained by mixing solid paraffin wax and liquid paraffin wax. Considering the process of introducing the phase change composite material into the encapsulation shell, the liquid phase change composite material before condensation can be introduced into the encapsulation shell. The introduction method can be determined according to the actual situation and is not limited here.

[0048] In one feasible embodiment, the encapsulation shell can also be a combination of different shells such as a raw bamboo shell, a polyvinyl chloride shell, and a metal shell. For example, a raw bamboo shell can be combined with a polyvinyl chloride shell, or a polyvinyl chloride shell and a metal shell, without limitation.

[0049] In operation S120, the top and bottom of the first encapsulation component are encapsulated using a tenon-shaped component to obtain a second encapsulation component, wherein the material of the tenon-shaped component is the same as the material of the encapsulation shell.

[0050] According to embodiments of this disclosure, the material of the tenon component is the same as the material of the encapsulated housing. For example, if the housing is made of raw bamboo, the tenon component can also be made of raw bamboo or wood; if the housing is made of metal, the tenon component can also be made of metal; if the housing is made of metal or polyvinyl chloride (PVC), the tenon component can also be made of PVC. It should be noted that the selection of the tenon component is based on the airtightness requirements of the housing, and is not specifically limited here.

[0051] It should be noted that the second encapsulation process can be performed simultaneously with the first encapsulation process, or the second encapsulation process can be used to encapsulate one end of the encapsulation shell first. After the phase change composite material is introduced (i.e., the first encapsulation process), the other end of the encapsulation shell containing the phase change composite material is then encapsulated using tenon-shaped components. The specific encapsulation process depends on the actual needs, and the specific encapsulation process is not limited here.

[0052] In operation S130, multiple second encapsulation components are bonded together using an adhesive material to obtain a biomass-based phase change energy storage material plate. The adhesive material includes a connecting material and an adhesive that meet a preset tensile strength.

[0053] According to embodiments of this disclosure, the adhesive material may include a connecting material and an adhesive that meet a preset tensile strength. The connecting material may be steel wire or hemp rope of a predetermined diameter, to meet the connection requirements between the second encapsulation components. The adhesive may be epoxy resin, to meet the bonding requirements between the second encapsulation components.

[0054] According to embodiments of this disclosure, a first encapsulation component can be obtained by first encapsulating the phase change composite material with a pre-defined encapsulation shell. A second encapsulation component is then obtained by second encapsulating the top and bottom of the first encapsulation component with tenon-shaped components, thereby obtaining a second encapsulation component that meets the sealing requirements. Furthermore, multiple second encapsulation components can be bonded together using an adhesive material to obtain biomass-based phase change energy storage panels of different sizes. Since the biomass-based phase change energy storage panel has phase change temperature regulation and energy storage functions as well as thermal insulation, and the encapsulation shell is easy to install and disassemble, the biomass-based phase change energy storage panel meets the requirements of indoor temperature control while achieving cost-effectiveness, energy saving, and environmental protection.

[0055] Figure 2 A schematic longitudinal section of a biomass-based phase change energy storage material plate according to an embodiment of the present disclosure is shown.

[0056] like Figure 2 As shown, the encapsulation housing 210 can encapsulate the phase change composite material 220, and at the same time, the tenon-shaped component 230 can be used to perform a second encapsulation process on the top and / or bottom of the first encapsulation component to form a completely closed second encapsulation component.

[0057] According to embodiments of this disclosure, the first encapsulation component is encapsulated using a housing and tenon-shaped components to achieve a tight seal, thus preventing leakage of the phase change composite material from causing structural damage to the interior of the wall.

[0058] According to embodiments of this disclosure, the melting point of solid paraffin is 45℃-50℃, and the preparation method of the phase change composite material includes: mixing solid paraffin and liquid paraffin in a first preset ratio and heating until melting to obtain a molten mixed paraffin; adding expanded graphite in a second preset ratio to the mixed paraffin and stirring uniformly, and then condensing to obtain a phase change composite material with a preset phase change temperature.

[0059] According to embodiments of this disclosure, solid paraffin and liquid paraffin can be weighed in a mass ratio of 4:6, mixed, and heated until melted. Expanded graphite can be added to the molten paraffin mixture in a second preset ratio, and the mixture can be stirred uniformly. The mass ratio of expanded graphite to molten paraffin mixture is 2.5%, i.e., the second preset ratio can be 2.5%. The uniform stirring time can be 10 minutes, depending on actual needs, and is not limited here. The composite phase change material after uniform stirring is a liquid phase change composite material. At this time, the liquid phase change composite material can be introduced into the encapsulation shell and then condensed to obtain a phase change composite material with a preset phase change temperature (e.g., 15℃-20℃).

[0060] According to an embodiment of this disclosure, when the packaging shell is a raw bamboo shell, the method for preparing the raw bamboo shell includes: immersing raw bamboo of a predetermined size in a preservative agent for a predetermined time; and immersing the soaked raw bamboo in a drying device for drying treatment to obtain a raw bamboo shell that meets a preset moisture content.

[0061] According to embodiments of this disclosure, when the packaging shell is made of raw bamboo, considering the inherent characteristics of the raw bamboo material, the raw bamboo shell can be treated with anti-corrosion and anti-mildew agents. The preservative can be phenolic resin with a predetermined solid content (e.g., 28% solid content). Specifically, in this disclosure, the raw material for the packaging shell can be immersed in phenolic resin with a solid content of 28% for 30 minutes, and after resin extrusion, it can be dried in an electric heating drying oven at 55°C until the moisture content is 10% to 14%. The specific preservative and drying process can be determined according to the actual situation and are not limited here.

[0062] According to embodiments of this disclosure, by treating the raw bamboo casing with anti-corrosion and anti-mildew measures, the strength and utilization rate of the raw bamboo casing can be improved. Raw bamboo has the characteristics of wide availability, ease of use, ease of maintenance and low cost. Using raw bamboo as the casing can meet the requirements of economic, energy-saving and environmental protection aspects.

[0063] According to embodiments of this disclosure, the preset phase change temperature of the condensed phase change composite material is 16°C-20°C.

[0064] According to embodiments of this disclosure, the preset phase change temperature range of the condensed phase change composite material can be set to 16~20℃, based on the comfortable indoor temperature range.

[0065] Figure 3 The illustration shows an hourly temperature comparison of the interior wall with and without phase change energy storage material (PCM) according to an embodiment of the present disclosure.

[0066] like Figure 3 As shown, taking summer and winter in hot-summer and cold-winter regions as examples, in summer, within 24 hours, the experimental temperature of the interior surface layer of walls without phase change composite materials (PCM) is 25.5℃-30℃, and the simulated temperature is 25℃-30.5℃; while the experimental temperature of the interior surface layer of walls using PCM is 26.7℃-28.7℃, and the simulated temperature can reach up to 27.3℃-28.3℃. In winter, within 30 hours, the experimental temperature of the interior surface layer of walls without PCM is 13.2℃-17.3℃, and the simulated temperature is 13.5℃-18℃; while the experimental temperature of the interior surface layer of walls using PCM is 14.5℃-16.7℃, and the simulated temperature is 15℃-16.5℃.

[0067] It can be seen that in summer, the temperature fluctuation of the wall interior surface layer using phase change composite materials is smaller than that of the wall interior surface layer without phase change composite materials, and the maximum temperature of the wall interior surface layer using phase change composite materials is lower than that of the wall interior surface layer without phase change composite materials. In winter, the temperature fluctuation of the wall interior surface layer using phase change composite materials is smaller than that of the wall interior surface layer without phase change composite materials, and the maximum temperature of the wall interior surface layer using phase change composite materials is higher than that of the wall interior surface layer without phase change composite materials. Therefore, walls using phase change composite materials improve indoor comfort while reducing the utilization rate of air conditioning.

[0068] According to embodiments of this disclosure, the connecting materials that meet the preset tensile strength include steel wire and / or hemp rope with a preset diameter requirement.

[0069] According to embodiments of this disclosure, the steel wire with the preset diameter requirement can be a steel wire with a diameter of not less than 0.3 mm, and the hemp rope can be a thin hemp rope with a tensile strength of not less than 500 MPa.

[0070] According to embodiments of this disclosure, the diameter of the encapsulation housing is 5cm-8cm.

[0071] According to embodiments of this disclosure, when the cross-section of the encapsulation housing is circular, the diameter of the encapsulation housing can be 5cm-8cm.

[0072] In one feasible embodiment, when the cross-section of the encapsulation housing is square, the side length of the encapsulation housing can be 5cm-8cm.

[0073] According to embodiments of this disclosure, the first preset ratio is a mass ratio of solid paraffin to liquid paraffin of 4:6, and the second preset ratio is a mass ratio of expanded graphite to mixed paraffin of 2.5%.

[0074] According to embodiments of this disclosure, a biomass-based phase change energy storage material plate is prepared as described above.

[0075] Figure 4 A schematic cross-sectional view of a biomass-based phase change energy storage material plate according to an embodiment of the present disclosure is shown.

[0076] like Figure 4 As shown, the phase change composite material 420 is encapsulated by the encapsulation shell 410, and the gaps between the encapsulation shells are filled by the biomass-based filler 430. The biomass-based phase change energy storage material board is connected to other structural layers (such as structural layers and interior surface layers) in the wall through the bonding layer 440. Specifically, in this disclosure, the biomass-based filler 430 may include biomass filler additives such as bamboo chips and wood chips. The specific filler type is not limited here as it meets the standards of energy conservation and environmental protection. The thickness of the biomass-based phase change energy storage material board can be 50mm-80mm, and the thickness of the bonding layer can be 10mm. It should be noted that the thickness of the biomass-based phase change energy storage material board and the bonding layer can be determined according to the specific actual situation, and is not limited here.

[0077] According to embodiments of this disclosure, an assembly of biomass-based phase change energy storage material panels of various sizes is prepared by bonding material plates side by side in the width direction and assembling and continuing them in the length direction using tenon-shaped components.

[0078] Figure 5 The diagram illustrates an assembly of a biomass-based phase change energy storage material plate according to an embodiment of the present disclosure.

[0079] like Figure 5As shown, multiple biomass-based phase change energy storage material (PCE) panels can be spliced ​​together to prepare assembly plates of various sizes. For example, a single biomass-based PCE panel may be 600mm x 600mm in size. By using connecting materials (such as steel wire or hemp rope) and adhesive materials (such as epoxy resin) to assemble and connect the tenon-shaped components of the biomass-based PCE panel, an assembly plate of 600mm x 1200mm in size can be obtained. Figure 5 In the diagram, end seal 510 is the end tenon assembly of the biomass-based phase change energy storage material panel, and middle seal 520 is the middle encapsulation part of the tenon assembly of different biomass-based phase change energy storage material panels. It should be noted that the assembly and connection method of the biomass-based phase change energy storage material panels is for illustrative purposes only and is not specifically limited here.

[0080] Figure 6 A schematic diagram of a biomass-based phase change energy storage wall according to an embodiment of the present disclosure is shown.

[0081] like Figure 6 As shown, a biomass-based phase change energy storage wall is prepared from a biomass-based phase change energy storage material board. The structure of the wall, from the inner wall surface outward, consists of: an interior surface layer 610, a first bonding layer 621, a phase change layer 630, a second bonding layer 622, a structural layer 640, an insulation layer 650, and an exterior surface layer 660. The phase change layer 630 is composed of a biomass-based phase change energy storage material board. The first bonding layer 621 and the second bonding layer 622 are bonded and shaped using epoxy resin. The insulation layer 650 is made of polyurethane foam and polystyrene. The interior surface layer 610 includes mortar plaster and / or diatomaceous earth coating.

[0082] According to embodiments of this disclosure, the first bonding layer 621 can serve as a connecting layer between the phase change layer 630 and the interior trim layer 610, and the second bonding layer 622 can serve as a connecting layer between the phase change layer 630 and the structural layer 640. The materials of the first bonding layer 621 and the second bonding layer 622 are not specifically limited here, but are determined based on meeting the bonding requirements between different structural layers. It should be noted that the number of layers, materials, and positions of the interior trim layer 610, the first bonding layer 621, the second bonding layer 622, the structural layer 640, the insulation layer 650, and the exterior trim layer 660 in this embodiment are merely illustrative and can be adapted to meet actual needs.

[0083] According to the embodiments of this disclosure, energy conservation and emission reduction in buildings are achieved by using biomass-based phase change energy storage walls. The working principle includes: since the heat transfer process of the wall is a dynamic heat transfer process that changes with time, the specific operation is as shown in formula (1):

[0084] (1)

[0085] Where T is the wall surface temperature during the heat transfer process, a function of time (t) and space (x). ρ, C, and λ represent the material's density, specific heat capacity, and thermal conductivity, respectively.

[0086] Because phase change composite materials absorb and release a large amount of latent heat during the phase change process, the material itself experiences a small temperature rise and is not easily affected by high outdoor temperatures. Therefore, phase change composite materials have the function of regulating temperature and storing heat for walls.

[0087] As a barrier separating the outdoor and indoor environments, the wall envelope structure transfers heat primarily through radiation and convection from the outdoor environment to the exterior wall surface, primarily through conduction from the exterior wall to the interior wall, and primarily through convection and radiation from the interior wall to the indoor environment. The heat flux values ​​are equal across all wall layers, and the specific heat flow operation is shown in formula (3):

[0088] (3)

[0089] Where T z (t) represents the overall outdoor air temperature, T in Indoor temperature, h out h is the outdoor environment convective heat transfer coefficient. in δ is the convective heat transfer coefficient of the interior wall, λ is the wall thickness, λ is the wall thermal conductivity, and R is the total thermal resistance.

[0090] Therefore, the specific operation of the surface temperature of the interior wall lining layer is as shown in formula (4):

[0091] (4)

[0092] According to embodiments of this disclosure, due to the inherent thermal resistance of the wall, a certain temperature difference exists between the outdoor and indoor temperatures. In summer, outdoor temperatures are high and fluctuate significantly. High temperatures from the outside are transferred to the interior through the wall enclosure structure. Due to the inherent thermal resistance of the wall material and the building's thermal inertia, the temperature transfer to the interior exhibits a certain degree of attenuation and delay. The thicker the wall, the better its insulation performance, and the more significant the attenuation and delay effect of outdoor temperature transfer to the interior. In winter and summer, air conditioning operating temperatures are generally around 18-24℃. The closer the indoor wall surface temperature is to this comfortable temperature range, the lower the air conditioning energy consumption.

[0093] Specifically, in this disclosure, by using biomass-based phase change energy storage wall panels, the temperature of the inner surface of the wall can be effectively regulated. In summer, external heat is transferred from the wall structure's insulation layer to the phase change wall panels and absorbed by the phase change material. Indoor cooling is transferred from the insulation and decorative layer to the phase change layer and absorbed by the phase change material. Thus, the phase change energy storage wall panels effectively regulate indoor temperature and reduce the frequency of air conditioning start-up and shutdown. In winter, indoor heat is transferred from the insulation and decorative layer to the phase change layer and absorbed by the phase change material, entering a heat storage stage. When the indoor temperature drops, heat is transferred back into the room through the insulation and decorative layer, thus raising the indoor temperature and regulating room temperature.

[0094] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0095] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1.A method for preparing a biomass-based phase change energy storage material plate, applied to a phase change layer of a building wall in a hot summer and cold winter area, comprising: performing first encapsulation processing on a phase change composite material by using an encapsulation shell with a predetermined size, to obtain a first encapsulation assembly, wherein the encapsulation shell is hollow inside and is a raw bamboo shell, the phase change composite material is prepared from solid paraffin, liquid paraffin and expanded graphite, the phase change composite material after the encapsulation processing is a liquid phase change composite material before condensation, the phase change temperature of the phase change composite material after condensation is 16-20℃, and the diameter of the encapsulation shell is 5-8cm; performing second encapsulation processing on the top and bottom of the first encapsulation assembly by using a tenon-shaped assembly, to obtain a second encapsulation assembly, wherein the material of the tenon-shaped assembly is the same as that of the encapsulation shell; and performing adhesion processing on a plurality of the second encapsulation assemblies by using an adhesion material, to obtain the biomass-based phase change energy storage material plate, wherein the adhesion material comprises a connecting material and an adhesive that meet a predetermined tensile strength. 2.The method of claim 1, wherein the melting point of the solid paraffin is 45-50℃, and the phase change composite material is prepared by: mixing the solid paraffin and the liquid paraffin at a first predetermined ratio, heating to melting, and obtaining a mixed paraffin in a molten state; adding the expanded graphite to the mixed paraffin at a second predetermined ratio, uniformly stirring, and obtaining the phase change composite material with a predetermined phase change temperature after condensation. 3.The method of claim 1, wherein, in the case that the encapsulation shell is the raw bamboo shell, the method for preparing the raw bamboo shell comprises: immersing a raw bamboo with a predetermined size in a preservative preparation for a predetermined duration; drying the immersed raw bamboo in a drying device, to obtain a raw bamboo shell that meets a predetermined water content. 4.The method of claim 1, wherein the connecting material that meets the predetermined tensile strength comprises a steel wire and / or a hemp rope that meet a predetermined diameter requirement. 5.The method of claim 2, wherein the first predetermined ratio is a mass ratio of the solid paraffin to the liquid paraffin of 4:6, and the second predetermined ratio is a mass ratio of the expanded graphite to the mixed paraffin of 2.5%. 6.A biomass-based phase change energy storage material plate prepared by the method of any one of claims 1-5. 7.The material plate of claim 6, wherein the material plate is prepared into an assembled plate of biomass-based phase change energy storage material plates of various sizes by adhesion in a width direction and splicing in a length direction by using tenon-shaped assemblies. 8.A biomass-based phase change energy storage wall prepared from the biomass-based phase change energy storage material plate of any one of claims 1-7, wherein the wall has the following structure from an inner wall surface to the outside: an inner decorative surface layer; a first bonding layer; a phase change layer; a second bonding layer; a structural layer; a thermal insulation layer; and an outer decorative surface layer. ​ ​ ​ ​ ​ ​ ​ ​ The phase change layer is composed of the biomass substrate phase change energy storage material plate, the first bonding layer and the second bonding layer are fixed and shaped by epoxy resin adhesion, the thermal insulation layer material includes polyurethane foam material and polystyrene material, and the inner facing layer includes mortar plastering and / or diatom ooze paint.

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