Fabricated reversible energy storage curtain wall system, preparation process and turning control method

Abstract

The present application relates to a prefabricated reversible energy storage curtain wall system, a preparation process and a turning control method, comprising a curtain wall unit and a main keel, the curtain wall unit is installed on the main keel, the curtain wall unit comprises a photovoltaic panel, a phase change cold storage and release panel, an insulating core panel and a frame, the insulating core panel is located between the photovoltaic panel and the phase change cold storage and release panel, the frame fixes the photovoltaic panel, the insulating core panel and the phase change cold storage and release panel in sequence into an integral body, and the frame is integrally formed with a rotating shaft on opposite sides; the rotating shaft on both sides of the curtain wall unit is supported on the main keel through a bearing. Advantage: the photovoltaic power generation and the phase change cold storage and release function are integrated in the same curtain wall unit, realizing the multifunctional integration of the building envelope structure, the intelligent turning mechanism, the automatic switching to the photovoltaic panel outward during the day, the efficient power generation and the charging of the energy storage battery; at night, the phase change cold storage and release panel is turned outward to absorb cold and store it in the phase change material, and release it the next day to reduce the indoor air conditioning load.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building curtain wall, in particular to a fabricated reversible energy storage curtain wall system, a preparation process and a turning control method. BACKGROUND

[0002] With the development of green buildings and low-carbon cities, the functional requirements of building envelope have gradually developed from traditional heat preservation, waterproofing, and windproof to multifunctional integration, intelligent control, and sustainable operation. As an important part of the building facade, curtain walls not only bear the enclosure function, but also become the key carrier for buildings to achieve energy self-sufficiency and reduce operating energy consumption. In recent years, photovoltaic curtain wall technology has been widely used because it can convert solar energy into electricity, and it has shown good application prospects in high-rise and super high-rise buildings. However, the existing photovoltaic curtain wall systems generally have the problems of single function and low energy utilization efficiency: photovoltaic modules are usually fixed and installed outward, and only generate electricity during the day under light conditions, and are idle at night, failing to fully utilize the low-temperature environmental resources at night.

[0003] At the same time, phase change materials (PCM) are widely used in building energy storage systems due to their high energy storage density and nearly constant temperature phase change characteristics, which are used to smooth room temperature fluctuations and reduce air conditioning load. Existing phase change energy storage curtain walls embed phase change materials in the wall or curtain wall panel, which is fixed in position and cannot dynamically adjust its working mode according to environmental conditions. Such systems can release latent heat (or absorb cold) through the solidification of phase change materials at night to achieve cold storage, but are still exposed to high-temperature outdoor environments during the day, resulting in the loss of the stored cold before it is released due to the intrusion of external heat, significantly reducing the cold storage efficiency.

[0004] In addition, since the photovoltaic system and the phase change energy storage system are usually set up independently, it causes complex construction levels and cumbersome construction procedures, often involving a large amount of on-site wet work, which does not meet the requirements of industrialization, rapidity, and low pollution of fabricated buildings.

[0005] Based on this, the present application is proposed. SUMMARY

[0006] The present application aims to provide a fabricated reversible energy storage curtain wall system, a preparation process and a turning control method, which integrates photovoltaic power generation, dynamic cold storage and release, and intelligent control to improve energy utilization efficiency, and has the characteristics of modularity, dry connection, factory prefabrication, and on-site rapid assembly, realizing the functional integration and construction industrialization of building envelope.

[0007] In order to achieve the above-mentioned purpose, the technical solutions of the present application are as follows:

[0008] An assembled reversible energy storage curtain wall system, comprising a curtain wall unit and a main keel, the curtain wall unit is installed on the main keel, and the main keel is used for being fixed on the building facade; the curtain wall unit comprises:

[0009] A photovoltaic panel, comprising a back plate and a cell fixed on the back plate;

[0010] A phase change cold storage and release panel, which is a composite panel containing phase change microcapsules;

[0011] An insulating core plate between the photovoltaic panel and the phase change cold storage and release panel;

[0012] A frame which fixes the photovoltaic panel, the insulating core plate and the phase change cold storage and release panel in sequence and integrally, and the frame is integrally formed with a rotating shaft on opposite sides;

[0013] A plurality of main keels are arranged in a crisscross manner on the building facade to form a plurality of installation frames, the curtain wall unit is located in the installation frame, the installation frame is provided with an installation hole corresponding to the rotating shaft, a bearing seat is arranged in the installation hole, and the rotating shaft on both sides of the curtain wall unit is supported in the installation hole through the bearing;

[0014] The main keel is provided with a driving unit, a control unit and an energy storage unit, the driving unit drives the rotating shaft to rotate the curtain wall unit, the energy storage unit receives the converted electric energy from the photovoltaic panel and outputs to the corresponding electric equipment, and the control unit issues an execution command to the driving unit to control the rotation of the curtain wall unit.

[0015] Further, the frame is made of heat-insulating aluminum alloy, a heat-conducting rod one is integrated in the rotating shaft, a heat-conducting rod two is fixed in the frame, one end of the heat-conducting rod one extends out of the rotating shaft and enters the cavity of the main keel through the installation hole, the other end is located in the rotating shaft and connected with the heat-conducting rod two, and the heat-conducting rod two is in close contact with the back plate.

[0016] Further, the phase change cold storage and release panel is a UHPC panel containing phase change microcapsules, and the thickness is between 20-40 mm, and the phase change microcapsules are sodium sulfate decahydrate phase change microcapsules.

[0017] Further, the phase change cold storage and release panel comprises an outer layer plate, a middle layer plate and an inner layer plate from outside to inside, each layer plate is a composite panel containing phase change microcapsules, each layer plate is bonded and fixed, the total thickness of the phase change cold storage and release panel is between 40-70 mm, and the phase change temperature of each layer plate decreases layer by layer from outside to inside.

[0018] Further, a heat-conducting layer is arranged between the outer layer plate and the middle layer plate and between the middle layer plate and the inner layer plate, and the heat-conducting layer is made of nickel-plated metal mesh or graphene carbon fiber composite sheet.

[0019] A preparation process of the phase change cold storage and release plate,

[0020] The outer layer plate is a UHPC plate containing sodium sulfate decahydrate phase change microcapsules;

[0021] The middle layer plate is a polyurethane foaming plate containing decanoic acid-lauric acid phase change microcapsules;

[0022] The inner layer plate is a diatomite matrix plate containing n-octadecane phase change microcapsules, and the surface is coated with a nano-silicon dioxide hydrophobic coating;

[0023] The preparation of the inner layer plate includes the following steps:

[0024] Add n-octadecane microcapsules in a mass ratio of 20-30% to deionized water, stir at low speed for 30 minutes to form a stable suspension;

[0025] Mix diatomite powder and binder in a ratio of 7:3, add the stable suspension and stir uniformly to form a mixed solution;

[0026] Pour the mixed solution into the mold and cure to form a flat plate, and cut to the required size after demolding;

[0027] Apply nano-silicon dioxide sol to the outer surface by spraying or dipping, and form a hydrophobic layer after drying at room temperature;

[0028] The preparation of the middle layer plate includes the following steps:

[0029] Add decanoic acid-lauric acid phase change microcapsules to component A at a content of 15-25 wt%, and stir uniformly, wherein component A is a mixture of polyol, catalyst and foaming agent;

[0030] Mix component A and isocyanate in a ratio of 0.9-1.1:1, pour into the mold at 25-30°C, and control the density of the obtained foam to be 80-120 kg / m³ to form a closed-cell foam structure;

[0031] Demold after curing, and cut to the required size;

[0032] The preparation of the outer layer plate includes the following steps:

[0033] Surface modification treatment is performed on the sodium sulfate decahydrate phase change microcapsules;

[0034] Add the modified microcapsules to the UHPC dry mixture at a content of 10-20 wt%, and dry mix uniformly, wherein the UHPC dry mixture is a mixture including cement, silica fume, quartz sand, steel fiber and water reducing agent;

[0035] Add water and stir, and control the water-binder ratio to be between 0.2 and 0.25;

[0036] Pouring into a mold, vibrating compaction, and curing molding;

[0037] After demolding, cutting to the required size;

[0038] The three-layer plate composite integration comprises the following steps:

[0039] After removing dust from the surface of each layer plate, spraying a primer;

[0040] Using heat-conducting silica gel to bond the three layers in sequence to form a composite plate;

[0041] After bonding, curing for 24 hours, and coating sealant around the composite plate.

[0042] Further, a heat-conducting layer is arranged between the outer layer plate and the middle layer plate, and between the middle layer plate and the inner layer plate, the heat-conducting layer adopts a nickel-plated metal mesh or a graphene carbon fiber composite sheet, and the outer layer plate, the heat-conducting layer, the middle layer plate, the heat-conducting layer and the inner layer plate are bonded in sequence by heat-conducting silica gel to form a composite plate.

[0043] A turning control method for the above-mentioned assembled reversible energy storage curtain wall system, comprising the following steps:

[0044] When the indoor temperature is greater than the minimum phase change temperature of the phase change cold storage release plate, and , the reversible curtain wall unit turns the photovoltaic panel outward, wherein represents the current solar radiation intensity, represents the photovoltaic power generation starting threshold value;

[0045] When , and the outdoor temperature is less than the maximum phase change temperature of the phase change cold storage release plate, the reversible curtain wall unit turns the phase change cold storage release plate outward, wherein represents the photovoltaic power generation ending threshold value.

[0046] Further, if the power generation power within 1 hour after turning over the previous day is less than 50 W / m², the value of increases by 20 W / m² on the current day, and if the power generation power within 1 hour after turning over the previous day is greater than 100 W / m², the value of decreases by 20 W / m² on the current day.

[0047] Further, if the solar radiation intensity is still greater than 150 W / m² 30 minutes after turning over the previous day, decreases by 20 W / m², and vice versa.

[0048] The advantages of the present application are:

[0049] 1. Innovatively integrates photovoltaic power generation and phase change cold storage and release functions in the same curtain wall unit, realizing the multifunctional integration of building envelope. The system adopts an intelligent flipping mechanism, automatically switching to photovoltaic panels facing outward during the day to generate electricity efficiently and charge energy storage batteries; at night, it flips to make phase change cold storage and release panels face outward, absorbing cold at night and storing it in phase change materials, which are released the next day to reduce indoor air conditioning load. This "one board with two functions" design significantly improves material utilization efficiency, effectively reduces building cooling and heating energy consumption and carbon emissions, and realizes the temporal and spatial optimization of energy allocation.

[0050] 2. The phase change cold storage and release layer adopts a "outer-middle-inner" three-layer gradient design, embedding different phase change temperature microcapsule materials: the outer layer is modified sodium sulfate decahydrate with a temperature of 25-28°C, the middle layer is decanoic acid-lauric acid eutectic with a temperature of 22-25°C, and the inner layer is n-octadecane microcapsule with a temperature of 20-22°C. At night, the curtain wall flips to expose the outer layer to the outdoor, and the high-temperature phase change material responds to the cooling environment first, freezing and storing cold from the outside to the inside layer by layer, fully utilizing the cold source that gradually decreases from evening to early morning; during the day, the curtain wall resets, and the low-temperature phase change inner layer melts and absorbs heat first, achieving rapid cooling, and the middle and outer layers respond in turn, forming a gradient cooling from the inside to the outside, significantly extending the effective cooling time and reducing air conditioning peak load. High thermal conductivity materials (such as nickel-coated copper mesh or thermal pads) are placed between the layers, and are bonded by thermal structure adhesive, which not only ensures the structural integrity, but also avoids thermal resistance bottlenecks. The frame uses heat-insulating aluminum alloy and integrates a heat-conducting rod system, effectively conducting the heat from the back plate to the main keel cavity, further improving the heat management capability.

[0051] 3. Based on adaptive learning strategy, comprehensively considering parameters such as solar radiation intensity, phase change material temperature and outdoor environment temperature, intelligently decides the flipping time. By dynamically adjusting the photovoltaic power generation start and end thresholds, the system can continuously optimize the control strategy according to the actual operation effect of the previous day, adapt to different seasons, weather and light conditions, and significantly improve the stability and intelligence level of operation.

[0052] 4. The whole system adopts a full dry assembly method, with no welding and no wet work on site, greatly improving the construction efficiency and reducing building waste by more than 80%. All electrical connections can use quick plug terminals, and key components such as drive motors and energy storage batteries are designed in a modular way, which is convenient for later maintenance and replacement, not only suitable for high-rise and super high-rise buildings, but also provides a high-efficiency, intelligent and replicable envelope structure technology path for green and low-carbon buildings. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 Figure 1 is a three-dimensional structural schematic diagram of the assembly type reversible energy storage curtain wall system in Example 1;

[0054] Figure 2 Figure 2 is a three-dimensional structural schematic diagram of the assembly type reversible energy storage curtain wall system in Example 2; Figure 1A schematic view of the rotating state of the curtain wall unit;

[0055] Figure 3 A schematic view of the construction of the curtain wall unit in Example 1;

[0056] Figure 4 A schematic view of each layer of the phase change cold storage and release plate in Example 1;

[0057] Figure 5 A control logic diagram of the assembled reversible energy storage curtain wall system in Example 1;

[0058] Label explanation

[0059] 1, curtain wall unit; 1011, back plate; 1012, battery piece; 102, phase change cold storage and release plate; 1021, outer layer plate; 1022, middle layer plate; 1023, inner layer plate; 1024, heat conduction layer; 103, heat insulation core plate; 104, frame; 105, rotating shaft; 106, heat conduction rod 1; 107, heat conduction rod 2; 108, driving motor; 2, main keel. DETAILED DESCRIPTION

[0060] The application will be further described in conjunction with the examples. It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the coordinate system of the drawings, and are only used for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. Example 1

[0061] This embodiment proposes an assembled reversible energy storage curtain wall system, as shown in Figure 1 , which comprises a curtain wall unit 1 and a main keel 2, the curtain wall unit 1 is installed on the main keel 2, and the main keel 2 is used to be fixed on the building facade. This embodiment innovates the curtain wall unit 1, as shown in Figure 3As shown, it comprises a photovoltaic panel, a phase change cold storage and release panel 102, an insulating core panel 103 and a frame 104, which fixes the photovoltaic panel, the insulating core panel 103 and the phase change cold storage and release panel 102 in sequence into an integrated body, and the frame 104 is integrally formed with a rotating shaft 105 on opposite sides. A plurality of main keels 2 are arranged in a crisscross manner on the building facade to form a plurality of mounting frames, the curtain wall unit 1 is located in the mounting frame, the mounting frame is provided with a mounting hole corresponding to the rotating shaft 105, a bearing seat is arranged in the mounting hole, and the rotating shaft 105 on both sides of the curtain wall unit 1 is supported in the mounting hole through the bearing. The main keel 2 is provided with a driving unit, a sensor, a control unit and an energy storage unit, the driving unit drives the rotating shaft 105 to rotate the curtain wall unit 1, the energy storage unit receives the converted electric energy from the photovoltaic panel and outputs it to the corresponding electric equipment, the sensor is used to collect temperature, light intensity and other data, and the control unit issues an execution command to the driving unit to control the rotation of the curtain wall unit 1.

[0062] The photovoltaic power generation and the phase change cold storage and release function are integrated in the same curtain wall unit 1, realizing the multifunctional integration of the building envelope structure. The system adopts an intelligent flipping mechanism, which automatically switches to the photovoltaic panel outward during the day to generate electricity efficiently and charge the energy storage battery; at night, it flips to make the phase change cold storage and release panel 102 outward to absorb cold at night and store it in the phase change material, which is released the next day to reduce the indoor air conditioning load. This "one-board dual-purpose" design significantly improves the material utilization efficiency, effectively reduces the cooling and heating energy consumption and carbon emissions of the building, and realizes the time and space optimization of energy allocation.

[0063] As a preferred embodiment, EPDM rubber strips can be arranged at the mounting frames formed by the crisscross main keels or the outer walls of the frame to ensure the air tightness and water tightness after the flip and locking.

[0064] The following describes the layers of the curtain wall unit 1 in detail.

[0065] The photovoltaic panel comprises a back plate 1011 and a cell sheet 1012 fixed on the back plate 1011, and can be directly purchased. Since the photovoltaic panel has a very strong heat absorption capacity, the heat absorbed by the cell sheet 1012 will be conducted to the frame 104 through the back plate 1011, and may be conducted to the phase change cold storage and release panel 102 through the frame 104, forming a metal thermal bridge and weakening the cold storage and release function of the phase change cold storage and release panel 102. As a preferred embodiment, the frame 104 of the present embodiment adopts a heat-breaking aluminum alloy frame 104 (or a broken bridge aluminum alloy frame 104), the core principle of which is to add a heat insulation cavity inside the profile and fill it with insulating material to block the heat transfer, so that the thermal conductivity coefficient is reduced by 40%-50% compared with the ordinary aluminum alloy frame 104.

[0066] Further, to better release the heat energy absorbed by the photovoltaic panel, the shaft 105 of the embodiment is integrated with a heat conduction rod 106, and the frame 104 is fixed with a heat conduction rod 107, one end of the heat conduction rod 106 extends out of the shaft 105 and enters the cavity of the main keel 2 through the mounting hole, and the other end is located in the shaft 105 and connected with the heat conduction rod 107, and the heat conduction rod 107 is in close contact with the back plate 1011. The heat conduction structure can make part of the heat absorbed by the photovoltaic panel pass through the heat conduction rod 107 and the heat conduction rod 106 to the main keel cavity for release.

[0067] The heat insulation core plate 103 is located between the photovoltaic panel and the phase change cold storage and release panel 102, has an extremely low thermal conductivity, and is used to block the heat transfer between the two (i.e. to avoid the heat energy on the photovoltaic panel from being transmitted to the phase change cold storage and release panel 102, and the cold energy absorbed on the phase change cold storage and release panel 102 from being released to the photovoltaic panel). The design thickness is between 10-30mm, and vacuum insulation panels VIP, aerogel composite panels, etc. can be used.

[0068] As shown in Figure 4 The phase change cold storage and release panel 102 is a composite panel containing phase change microcapsules. In the embodiment, the phase change cold storage and release panel 102 sequentially includes an outer layer panel 1021, a middle layer panel 1022 and an inner layer panel 1023 from outside to inside, each layer panel is a composite panel containing phase change microcapsules, the layer panels are bonded and fixed, and the overall thickness of the phase change cold storage and release panel 102 is between 40-70mm, and the phase change temperature of each layer panel decreases from outside to inside. The phase change cold storage and release layer adopts a “outer-middle-inner” three-layer gradient design, and different phase change temperature microcapsule materials are embedded, at night, the outer layer is exposed to the outdoor environment by the curtain wall turning over, the high-temperature phase change material responds to the cooling environment first, and solidifies and stores cold from outside to inside, the middle layer and the inner layer fully utilize the characteristics of gradually decreasing temperature from evening to early morning, and gradually start phase change to store cold; during the day, the curtain wall is reset, the low-temperature phase change inner layer melts and absorbs heat first, realizes rapid cooling supply, and the middle layer and the outer layer respond in turn as the ambient temperature rises, forming a gradient cooling release from inside to outside, significantly prolonging the effective cooling time and reducing the air conditioning peak load.

[0069] As the phase change cold storage and release board 102 is provided with multiple layers of materials with different phase change temperatures, heat transfer between different layers may have response lag and cold accumulation. To ensure and improve the cold storage efficiency, cold release speed and cold supply sustainability of the phase change cold storage and release board 102, a heat conducting layer 1024 is arranged between the outer layer board 1021 and the middle layer board 1022 and between the middle layer board 1022 and the inner layer board 1023. The heat conducting layer 1024 is made of nickel-plated metal mesh or graphene carbon fiber composite sheet. The heat conducting layer 1024 builds a high-efficiency heat conducting path between the functional layers of the phase change cold storage and release board 102, significantly improves the interlayer heat transfer rate, and ensures that cold energy is quickly frozen and stored layer by layer from outside to inside at night and is gradually and orderly melted and released from inside to outside during the day.

[0070] The embodiment provides a specific phase change cold storage and release board and a preparation process of the board, and the specific process is as follows.

[0071] In the embodiment, the outer layer board is a UHPC board containing sodium sulfate decahydrate phase change microcapsules, the phase change temperature is between 25-28℃, the middle layer board is a polyurethane foaming board containing decanoic acid-lauric acid phase change microcapsules, the phase change temperature is between 22-25℃, the inner layer board is a diatomite matrix board containing n-octadecane phase change microcapsules, the phase change temperature is 20-22℃, and the surface of the inner layer board is coated with a nano-silicon dioxide hydrophobic coating. The specific temperature of each layer of phase change can be adjusted according to the purity or concentration of the phase change microcapsules.

[0072] As the outer layer board needs to directly face wind pressure, rain and snow, ultraviolet rays and severe temperature changes, it must have excellent structural strength and durability. UHPC (ultra-high performance concrete) becomes an ideal protective matrix material due to its high compressive strength (≥150 MPa), good bending performance, strong impermeability and weather resistance. At the same time, sodium sulfate decahydrate has a relatively high phase change temperature and is suitable for being used as a cold storage starting layer. When the air temperature drops at night, it freezes first and transfers cold energy from outside to inside, realizing efficient cold energy capture.

[0073] The middle layer board mainly plays a role in heat buffering and gradient transition. The polyurethane foaming material has a good closed-cell structure and bonding performance, which is beneficial to the uniform dispersion of microcapsules and the formation of a light and stable composite system, so that cold energy can be orderly transferred from outside to inside after the outer layer is frozen, heat shock is avoided, the release rhythm of cold energy is delayed, and the thermal inertia and adjustment capacity of the system are improved.

[0074] The diatomite matrix of the inner layer board has the characteristics of multiple pores, light weight and large specific surface area, which is beneficial to the high load and thermal response of microcapsules, and the low thermal conductivity of the diatomite matrix can reduce the loss of cold energy to the back plate side, so that cold energy is preferentially released to the indoor. To prevent the diatomite from affecting the performance of PCM and the stability of the material due to moisture absorption, a nano-silicon dioxide hydrophobic coating is coated on the surface of the diatomite, which can effectively block the invasion of water vapor, prevent condensation and mildew, and improve the durability.

[0075] The preparation process is as follows:

[0076] S10. Inner layer plate preparation:

[0077] S11. Add n-octadecane microcapsules to deionized water at a mass ratio of 20-30%, stir at low speed for 30 minutes to form a stable suspension;

[0078] S12. Mix diatomite powder and binder at a ratio of 7:3, add to the stable suspension and stir evenly to form a mixed solution;

[0079] S13. Pour the mixed solution into the mold and cure to form a flat plate. After demolding, cut to the required size;

[0080] S14. Apply nano-silica sol to the outer surface by spraying or dipping, and dry at room temperature to form a hydrophobic layer;

[0081] S20. Preparation of middle layer plate:

[0082] S21. Add decanoic acid-lauric acid phase change microcapsules to component A at a content of 15-25 wt%, and stir evenly, wherein component A is a mixture of polyol, catalyst and blowing agent;

[0083] S22. Mix component A and isocyanate at a ratio of 0.9-1.1:1, pour into the mold at 25-30°C, and control the density of the obtained foam at 80-120 kg / m³ to form a closed-cell foam structure;

[0084] S23. Demold after curing, and cut to the required size;

[0085] S30. Preparation of outer layer plate (the preparation of outer layer plate can refer to patent 202411794091.0):

[0086] S31. Surface modification treatment of sodium sulfate decahydrate phase change microcapsules;

[0087] S32. Add modified microcapsules to UHPC dry mixture at 10-20 wt%, and dry mix evenly, wherein the UHPC dry mixture is a mixture including cement, silica fume, quartz sand, steel fiber, and water reducing agent;

[0088] S33. Add water and stir, control the water-binder ratio between 0.2-0.25;

[0089] S34. Pour into the mold, vibrate and compact, and cure to form;

[0090] S35. Cut to the required size after demolding;

[0091] S40. Three-layer plate composite integration:

[0092] S41. After removing dust from the surface of each layer plate, spray primer;

[0093] S42. Place a heat-conducting layer between the outer layer plate and the middle layer plate, and between the middle layer plate and the inner layer plate, the heat-conducting layer uses a nickel-plated metal mesh or a graphene carbon fiber composite sheet, and the outer layer plate, heat-conducting layer, middle layer plate, heat-conducting layer, and inner layer plate are sequentially bonded by heat-conducting silica gel to form a composite plate;

[0094] S43. After bonding, cure for 24 hours, and apply sealant around the composite plate, the sealant can form a continuous waterproof barrier to effectively prevent moisture from entering from the cut edges and interlayer gaps.

[0095] The flip control process of the assembled reversible energy storage curtain wall system in this embodiment is based on the total control module (which can be set in the control room and communicates with the control unit on the keel), the clock module (which can be set in the control room), multiple temperature sensors (such as indoor temperature sensors, outdoor temperature sensors, phase change cold storage release plate temperature sensors), light sensors, etc. Collect natural data, compare the collected data with the set threshold, according to the control strategy, control the drive part through the control unit, the drive part can use single curtain unit single motor control, or through the way of synchronous wheel and synchronous belt, realize single motor synchronous control of multiple curtain units, such as Figure 2 As shown in the figure, this embodiment adopts the mode of single curtain unit single motor control. The setting of the drive part is the existing conventional technology, which is not described here. It should be noted that in this embodiment, the energy storage unit (energy storage battery) uses lithium iron phosphate battery, and the capacity is designed at least as "electricity consumption x 4 (for rainy days) for one flip". The excess electricity can be connected to the grid or used for indoor load. In addition, the energy storage unit can be designed to be detachable and replaceable (such as setting a removable maintenance cover at the corresponding installation position of the keel, to facilitate battery replacement).

[0096] As shown in the figure, the control strategy is as follows: Figure 5

[0097] First, the day and night flip time periods need to be defined in the clock module, such as 5:00-10:00 for daytime flip time period and 17:00-22:00 for nighttime flip time period, while setting that the curtain unit can only flip within these two time periods, and can only flip once a day in each time period, so at most 2 times a day (once in the daytime and once at night), which ensures that the number of flips is not too many, and can improve the stability of the entire curtain system, and also ensures the comfort of office workers in the building (too many flips will affect office work);

[0098] When a round of judgment logic runs;

[0099] ​If it is judged that, during the daytime flipping time period, the indoor temperature is greater than the lowest phase change temperature of the phase change cold storage panel (in this embodiment, the phase change cold storage panel has three phase change temperatures, and the lowest one is taken here), and , the curtain wall unit flips to make the photovoltaic panel face outward, where represents the current solar radiation intensity, represents the photovoltaic power generation start threshold value;

[0100] If it is judged that, during the nighttime flipping time period, when , and the outdoor temperature is less than the highest phase change temperature of the phase change cold storage panel, the curtain wall unit flips to make the phase change cold storage panel face outward, where represents the photovoltaic power generation end threshold value.

[0101] If no flipping is performed during the flipping time period, no flipping is performed again, and the next round of judgment logic is run.

[0102] As a preference, the photovoltaic power generation start threshold value and the photovoltaic power generation end threshold value of this embodiment are adaptively adjusted according to the weather condition, to improve the reliability of the control strategy, as follows:

[0103] If the power generation power within 1 hour after flipping of the previous day is less than 50 W / m2, the value of is increased by 20 W / m2 on the current day, and if the power generation power within 1 hour after flipping of the previous day is greater than 100 W / m2, the value of is decreased by 20 W / m2 (that is, if the power generation power is not high or too high after flipping in the early morning, the flipping time can be delayed or advanced by adjusting the photovoltaic power generation start threshold value);

[0104] If the solar radiation intensity is still greater than 150 W / m2 after 30 minutes of flipping of the previous day, the value of is decreased by 20 W / m2, and vice versa (that is, if the solar radiation intensity can still support effective photovoltaic conversion or has already not supported effective photovoltaic conversion after flipping in the evening, the flipping time can be delayed or advanced by adjusting the photovoltaic power generation end threshold value).

[0105] The principle of the present embodiment is substantially the same as that of Embodiment 1, except that the design of the phase change cold storage and release plate is different. In Embodiment 1, the phase change cold storage and release plate has three layers of plates with different phase change temperatures, which can prolong the time of cold release and improve the effect of cold release, but the cost of the plate is high and the manufacturing process is complex. The present embodiment gives a low-cost phase change cold storage and release plate, which has only one layer, which is a UHPC plate containing phase change microcapsules, with a thickness of 20-40 mm, and the phase change microcapsules are sodium sulfate decahydrate phase change microcapsules with a phase change temperature of about 25°C, and the preparation process is referred to the preparation of the outer plate in Embodiment 1.

[0106] The above embodiments are only used to explain the concept of the present application, and are not a limitation on the protection of the present application. Any non-essential modification of the present application using this concept shall fall within the scope of protection of the present application.

Claims

1. A prefabricated reversible energy-storing curtain wall system, comprising curtain wall units and a main rail, the curtain wall units being mounted on the main rail, the main rail being used to be fixed on the building facade; characterized in that, The curtain wall unit comprises: a photovoltaic panel comprising a back plate and a cell fixed on the back plate; a phase change cold storage and release panel, which is a composite panel containing phase change microcapsules; the phase change cold storage and release panel comprises, from outside to inside, an outer layer panel, a middle layer panel and an inner layer panel, each of which is a composite panel containing phase change microcapsules, and each of the panels is fixedly bonded to each other, and the total thickness of the phase change cold storage and release panel is between 40-70 mm, and the phase change temperature of each layer panel decreases from outside to inside; an insulating core panel between the photovoltaic panel and the phase change cold storage and release panel; a frame which integrally fixes the photovoltaic panel, the insulating core panel and the phase change cold storage and release panel in order, and opposite sides of the frame are integrally formed with rotating shafts; a plurality of main keels are arranged on the building facade in a crisscross manner to form a plurality of installation frames, the curtain wall unit is located in the installation frame, the installation frame is provided with installation holes corresponding to the rotating shafts, bearing seats are arranged in the installation holes, and the rotating shafts on the two sides of the curtain wall unit are supported in the installation holes through the bearing seats; the main keel is provided with a driving unit, a control unit and an energy storage unit, the driving unit drives the rotating shaft to rotate the curtain wall unit, the energy storage unit receives the electric energy converted from the photovoltaic panel and outputs the electric energy to corresponding electric equipment, and the control unit issues an execution command to the driving unit to control the rotation of the curtain wall unit.

2. The assembled and reversible energy-storing curtain wall system according to claim 1, wherein, The frame is made of heat-insulating aluminum alloy, a heat-conducting rod one is integrated in the rotating shaft, a heat-conducting rod two is fixed in the frame, one end of the heat-conducting rod one extends out of the rotating shaft and enters the cavity of the main keel through the installation hole, the other end is located in the rotating shaft and is connected with the heat-conducting rod two, and the heat-conducting rod two is in close contact with the back plate.

3. The assembled and reversible energy-storing curtain wall system according to claim 1, wherein, A heat-conducting layer is arranged between the outer layer panel and the middle layer panel and between the middle layer panel and the inner layer panel, and the heat-conducting layer is made of a nickel-plated metal mesh or a graphene carbon fiber composite sheet.

4. A preparation process of the phase change cold storage and release panel used in the system of claim 1 or 3, characterized in that: the outer layer panel is a UHPC panel containing sodium sulfate decahydrate phase change microcapsules; the middle layer panel is a polyurethane foaming panel containing decanoic acid-lauric acid phase change microcapsules; the inner layer panel is a diatomite matrix panel containing n-octadecane phase change microcapsules, and the surface is coated with a nano-silicon dioxide hydrophobic coating; the preparation of the inner layer panel comprises the following steps: n-octadecane microcapsules are added to deionized water at a mass ratio of 20-30%, and stirred at a low speed for 30 minutes to form a stable suspension; diatomite powder and a binder are mixed at a ratio of 7:3, the stable suspension is added and stirred uniformly to form a mixed liquid; the mixed liquid is poured into a mold and cured to form a flat plate, and the flat plate is cut to the required size after demolding; a nano-silicon dioxide sol is applied to the outer surface by spraying or dipping, and a hydrophobic layer is formed after drying at room temperature; the preparation of the middle layer panel comprises the following steps: decanoic acid-lauric acid phase change microcapsules are added to component A at a content of 15-25 wt%, and stirred uniformly, wherein component A is a mixture of polyol, catalyst and foaming agent; Mixing component A and isocyanate in a ratio of 0.9-1.1:1, injecting into the mold at 25-30℃, standing and foaming to form a closed-cell foam structure with a density of 80-120 kg / m³; After curing, demoulding and cutting to the required size; The three-layer composite integration includes the following steps: Spray primer on the surface of each layer after removing dust; Use heat-conducting silicone to bond the three layers in sequence to form a composite board; After bonding, cure for 24 hours and apply sealant around the composite board.

5. The process for preparing a phase change material cold storage and cold release panel according to claim 4, characterized in that: A heat-conducting layer is provided between the outer layer and the middle layer, and between the middle layer and the inner layer, which is made of nickel-plated metal mesh or graphene carbon fiber composite sheet. The outer layer, heat-conducting layer, middle layer, heat-conducting layer, and inner layer are bonded in sequence by heat-conducting silicone to form a composite board.

6. A method for controlling the rotation of the assembled reversible energy storage curtain wall system according to any one of claims 1-3, comprising the following steps: When the indoor temperature is greater than the minimum phase change temperature of the phase change cold storage release board, and the flip curtain unit turns the photovoltaic board outward, wherein represents the current solar radiation intensity, represents the photovoltaic power generation starting threshold. When , and the outdoor temperature is less than the highest phase change temperature of the phase change cool storage release board, the curtain wall unit is flipped to make the phase change cool storage release board face outward, wherein represents a photovoltaic power generation end threshold.

7. The method of claim 6, wherein the method further comprises: If the power generated within 1 hour after the previous day's turnover is less than 50 W / m2, the value of the day is increased by 20 W / m2, and if the power generated within 1 hour after the previous day's turnover is greater than 100 W / m2, the value of the day is decreased by 20 W / m2. 8.The method of claim 6, wherein, If the solar radiation intensity is 30 minutes after the previous day's rotation... If it is still greater than 150 W / m², then The value decreases by 20 W / m², and vice versa.

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