Thermal activation energy storage inner wall containing phase change material

Abstract

The invention belongs to the field of constructional engineering, and relates to a phase change material-containing heat activation energy storage inner wall, which comprises a temperature adjusting layer and two outer protective layers, the outer protective layers are arranged on the two sides of the temperature adjusting layer, the temperature adjusting layer comprises grass bricks, phase change pipes and heat activation water pipes, the phase change pipes are laid in the grass bricks, the heat activation water pipes are embedded in the phase change pipes, and the heat activation water pipes are embedded in the phase change pipes. And a phase change material is filled between the inner wall of the phase change pipe and the outer wall of the thermal activation water pipe. According to the phase change energy storage inner wall, heat can be effectively absorbed and released from pipeline flow, the indoor environment temperature is remarkably increased, good thermal stability is achieved, and the positive influence on the indoor thermal comfort degree is generated.

Description

Technical Field

[0001] The invention belongs to the field of construction engineering, and in particular relates to a heat-activated energy storage inner wall containing phase change material. Background Art

[0002] Phase change materials have a high heat storage capacity due to their special high enthalpy value. Their application in building components can achieve the effect of slowing down the amplitude of building fluctuations and time lag. Incorporating thermal energy storage into building components will have an impact on the building environment, thereby reducing dependence on cooling and heating. This technical means shows a high energy-saving potential.

[0003] CN 221801886 U discloses an active phase-change energy storage wallboard radiation heating and cooling system, comprising: a phase-change energy storage wallboard, a solar heat collection system, and an air source heat pump system. The phase-change energy storage wallboard is provided with an exterior finishing layer, a thermal insulation layer, a concrete layer, a phase-change mortar layer, and an interior finishing layer in sequence from the outside to the inside. A circulating heat exchange pipe is laid in the phase-change mortar layer, and the circulating heat exchange pipe is arranged in an upper supply and lower return manner. The solar heat collection system and the air source heat pump system are connected to the heat exchange pipe in the phase-change energy storage wallboard through a circulating pipeline. The patent lays the pipe in the phase-change layer.

[0004] CN220908774U discloses a composite phase change wall for energy storage and temperature regulation, comprising an external mortar layer (1), a thermal insulation layer (2), a concrete layer (3), a phase change layer (4), a pipe layer (5) and an indoor plaster layer (6), wherein a water supply and return pipe (7) is laid in the pipe layer (5), the phase change layer (4) is filled with a phase change material, a push-pull switch (8) is provided at the upper end of the phase change layer (4), a reinforcing component (9) is provided inside the phase change layer (4), and a connecting component (10) is provided at the left end of the phase change layer (4). The patent sets the pipe and the phase change layer separately.

[0005] The problems with the above patents are: the temperature gradient of the phase change material decreases quickly, causing great disturbance to the environment and large indoor temperature fluctuations. In addition, there is a lack of effective means to control the temperature of the phase change material, making it difficult to accurately control the temperature of the phase change material during operation. Secondly, the structure is relatively complex, with multiple functional layers, and high requirements for the connection and coordination between the layers, which can easily lead to quality problems during the construction process. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a heat-activated energy storage inner wall containing phase change material, which can slow down the temperature gradient drop rate of the phase change material, release a large amount of latent heat when the liquid phase changes to the solid phase, slow down environmental disturbances, and better control the phase change material in the tube.

[0007] The present invention provides a heat-activated energy storage inner wall containing phase change material, comprising a temperature regulating layer and two outer protective layers, wherein the outer protective layers are arranged on both sides of the temperature regulating layer, the temperature regulating layer comprises straw bricks, phase change tubes and heat-activated water pipes, the phase change tubes are laid in the straw bricks, the heat-activated water pipes are nested in the phase change tubes, and the phase change material is filled between the inner wall of the phase change tube and the outer wall of the heat-activated water pipe.

[0008] Furthermore, the outer protective layer is made of gypsum board, cement board, aluminum board, wood board or fiber reinforced board.

[0009] Furthermore, the bend of the heat-activated water pipe is exposed outside the straw brick, and the bend is covered with a heat-insulating board.

[0010] Furthermore, the insulation board is an extruded polystyrene board or a polyurethane foam board or a rock wool board.

[0011] Furthermore, the insulation board is connected to the bend of the heat-activated water pipe via a connector.

[0012] Furthermore, the phase change material is paraffin or fatty acid or ester compound or polyol.

[0013] Furthermore, the straw bricks are multiple pieces bonded together by adhesive.

[0014] Furthermore, a plurality of through holes are arranged in parallel and at intervals in the straw bricks, and phase change tubes are installed in the through holes, and the heat activated water pipe passes through the axis of the phase change tube, and the turning part of the heat activated water pipe is not covered by the phase change tube, but by the extruded polystyrene board. Two gypsum boards are attached to the outer surfaces of the straw bricks and the extruded polystyrene board.

[0015] Furthermore, the heat-activated water pipes are made of PB (polybutylene PB resin) pipes; the heat-activated water pipes are arranged in a circuitous manner inside the wall through the holes in the straw bricks; the heat-activated water pipes between two layers of different heights are connected with curved pipes, fixed with clips, and the gaps are filled with extruded polystyrene boards (XPS); the outside of the straw brick wall is covered with two opposing gypsum board outer layers.

[0016] Furthermore, the straw bricks are the load-bearing part of the wall (but the inner wall is not used as a load-bearing wall for construction), which are made of 120mm thick, 400mm high, and 1200mm long hot-pressed straw bricks bonded with construction adhesive. The straw bricks have three cylindrical through holes along the length direction, with a hole diameter of 60mm and a hole center spacing of 115mm. In the thickness direction, the hole center is 60mm away from the edge of the straw brick, and in the height direction, the hole centers on both sides are 85mm away from the edge of the straw brick.

[0017] Furthermore, the extruded polystyrene board (XPS) has a thickness of 120 mm and a length of 100 mm, and the height can be flexibly selected according to the size of the wall;

[0018] Furthermore, the phase change tube is a PVC tube with a wall thickness of 2 mm, an outer diameter of 60 mm, and a length of 1200 mm. Both ends are sealed with PVC plates and AB glue. A 20 mm diameter opening is reserved in the center of the sealing PVC plates on both sides of the tube for the heat-activated water pipe to pass through.

[0019] Furthermore, the thickness of the gypsum board is 5 mm, and the length and height can be flexibly selected according to the size of the wall;

[0020] Furthermore, the connector is a stainless steel connector, and the anchoring depth at each location is 50 mm.

[0021] Furthermore, the width of the wallboard conforms to the size of the building bay, with a length of 1200mm, a height of 2800mm and 3200mm, and a thickness of 130mm. The wall structure is assembled in a "sandwich" sandwich manner in the present invention, with two sides of the central axis being symmetrical and each being 65mm.

[0022] Advantages and beneficial effects of the present invention

[0023] 1. The present invention lays a phase change tube in the straw brick, embeds a heat-activated water pipe in the phase change tube, and fills a phase change material between the inner wall of the phase change tube and the outer wall of the heat-activated water pipe. The wall has good thermal stability and temperature regulation ability, has an attenuation delay effect on indoor temperature disturbance, can effectively improve the indoor thermal environment, and improve indoor comfort; compared with ordinary wall radiation heating, the energy saving rate reaches 53.36%, and the energy consumption is significantly reduced.

[0024] 2. The phase change energy storage interior wall of the present invention can effectively absorb and release heat from the pipeline flow, significantly improve the indoor ambient temperature, have good thermal stability, and have a positive impact on indoor thermal comfort. At the same time, the phase change material energy storage regulation and intermittent operation regulation can achieve "peak shaving and valley filling" to alleviate peak electricity consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the wall appearance diagram of the present invention;

[0026] Figure 2 It is a structural explosion diagram of the wall of the present invention;

[0027] Figure 3a It is the elevation view of the wall of the present invention;

[0028] Figure 3b is a cross-sectional view of the wall of the present invention;

[0029] Figure 4 It is a schematic diagram of the connecting member of the wall of the present invention;

[0030] Figure 5 The water supply and heat supply parameters of the pipeline flow of the present invention;

[0031] Figure 6 The temperature parameter of the energy storage inner wall of the present invention;

[0032] Figure 7 is the heat flux density of the straw brick wall of the present invention;

[0033] Figure 8 The energy storage parameters of the phase change energy storage inner wall of the present invention;

[0034] Fig. 9 are the environmental parameters inside and outside the laboratory of the present invention;

[0035] Fig.10 is the ambient temperature in the operating and non-operating laboratories of the present invention;

[0036] Fig.11 It is a temperature curve diagram of the double-sided space in the experimental test of the present invention;

[0037] Fig.12 The room temperature curves under different temperature control strategies of the experiment of the present invention, wherein (a) is the room temperature curve under the T1 control strategy, (b) is the room temperature curve under the T2 control strategy, and (c) is the room temperature curve under the T3 control strategy;

[0038] Fig.13 The temperature curves under different speed control strategies of the experiment of the present invention, where (a) is the room temperature curve under the V1 control strategy, (b) is the room temperature curve under the V2 control strategy, and (c) is the room temperature curve under the V3 control strategy;

[0039] Fig.14 The room temperature curves under different operation time control strategies of the experiment of the present invention, wherein (a) is the room temperature curve under the H1 control strategy, (b) is the room temperature curve under the H2 control strategy, and (c) is the room temperature curve under the H3 control strategy;

[0040] In the figure: 1. Gypsum board; 2. Straw brick; 3. Phase change tube; 4. Heat-activated water pipe; 5. Extruded polystyrene board; 6. Connectors. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] A thermally activated energy storage interior wall containing phase change material, such as Figure 2 and Figure 4As shown, it includes gypsum board 1, straw brick 2, phase change tube 3, heat-activated water pipe 4, extruded polystyrene board 5 and connecting piece 6.

[0043] The phase change tube 3 is a PVC sleeve with a wall thickness of 2 mm, an outer diameter of 60 mm, and a length of 1200 mm. Both ends are sealed with PVC plates and AB glue, and a 20 mm diameter hole is reserved in the center of the sealing PVC plates on both sides of the tube.

[0044] The phase change tube 3 is a phase change material packaging tube, and the phase change material is paraffin. When selecting the phase change material, considering that the organic phase change material paraffin has the characteristics of strong stability, non-toxic and non-corrosive, small solid-liquid phase volume change rate, large phase change latent heat, low supercooling, etc., it has strong advantages in being applied to phase change radiation inner walls. The molecular formula of paraffin is C n H 2n+2 It is mainly composed of a mixture of straight-chain alkanes, has a low melting point, and its phase change temperature can be changed in the range of -20-120℃. According to the "Design Code for Heating, Ventilation and Air Conditioning in Civil Buildings GB50736-2012", the calculation parameters of indoor air in winter are 18-24℃, and in summer are 22-28℃. Phase change materials with a phase change temperature of 18-28℃ are suitable for use in the inner wall of phase change embedded pipes. The following table shows the physical properties of paraffin materials.

[0045] Table 1 Physical properties of paraffin materials

[0046]

[0047] The elevation and section of the gypsum board 1, straw brick 2, phase change tube 3 and heat activated water pipe 4 are as follows: Figure 3a and Figure 3b As shown, at the same time Figure 3a and Figure 3b It can be seen that the main structure of the wall, the straw brick 2 structure is 120mm thick, 400mm high, 1200mm long and placed horizontally. The three holes in the horizontal direction of the straw brick are filled with phase change tubes, the hole diameter is 60mm, the holes on both sides are 55mm away from the top (bottom) of the straw brick, the outer diameter of the middle hole is 55mm away from the outer diameter of the holes on both sides, and the axis of the middle hole is 85mm away from the axis of the holes on both sides. The heat-activated water pipe 4 passes through the axial position of the phase change tube 3. The diameter of the heat-activated water pipe 4 is 20mm, and holes with a diameter of 20mm are opened on both sides of the phase change tube 3. The heat-activated water pipe 4 is not covered by the phase change tube 3 at the bend, but is covered by the extruded polystyrene board 5. The extruded polystyrene board 5 is 120mm thick and 100mm long. The outer skin of the wall is gypsum board 1 with a thickness of 5mm. The connector 6 is a stainless steel connector with an anchoring depth of 50mm. The anchoring position is as follows Figure 4 The total height of the wall can be adjusted according to the actual situation of the project. The specific height should be an integer multiple of the height of straw brick 2, 400mm, such as 2800mm, 3200mm.

[0048] The heat-activated water pipe 4 and the extruded polystyrene board 5 are connected via a connector 6 .

[0049] In order to demonstrate the superior thermal properties of the heat-activated energy storage inner wall with phase change, an experimental verification was conducted. The experimental site was the security room of the Ximen Steel Structure Institute of Tianjin University. According to the winter heating period in Tianjin from November 15 to March 15, the test time of this study was from January 1 to January 4, 2024, and the operation time was from 8:30 to 17:30. The heat of the phase change energy storage inner wall comes from hot water heated by pipe flow. The experimental test was conducted from January 27 to January 31, and the water supply time was from 8:30 in the morning to 17:30 in the afternoon.

[0050] In this experiment, the parameters of water supply and heat supply of pipeline flow are as follows: Figure 5 During the heat medium supply process, the water outlet temperature gradually increases, and the phase change temperature gradually increases from 46.3℃ to 48.2℃, an increase of 2℃, and the temperature difference with the pipeline flow increases, so the heat absorbed decreases, and the heat supply of the pipeline flow per unit time gradually decreases. The average water outlet temperature is 47.6℃. The heat supply per unit time reaches a peak of about 1130W when the water pump is turned on, and reaches the lowest when the water pump is turned off, still maintaining at about 500W, and the average heat supply of the pipeline flow reaches 668.69W. Part of the heat of the phase change energy storage interior wall heat supply enters the room through convection and wall radiation, heating the indoor walls and air, and the other part of the heat is stored in the phase change material and the main structure, and released at night.

[0051] In the experiment, the temperature of the inner wall of the phase change energy storage is monitored and the parameters of the inner wall temperature are as follows: Figure 6 The phase change temperature fluctuates between 16.3℃ and 43℃, and the temperature fluctuation range of the straw brick wall panel is 15~23℃. When the water supply temperature is 50℃, the heat supply is large, the temperature of the phase change material rises, and after a period of water flow, it quickly heats up and changes to liquid state, and further transfers heat to the straw wall panel through heat conduction. The thermal conductivity of the straw brick wall panel is small, and it is affected by the relatively large specific heat capacity at constant pressure, so the temperature fluctuation is small. Compared with the pipeline flow temperature, the wall temperature of the straw brick wall has a certain attenuation delay. Figure 6 It can be seen that the average temperatures of pipe water, phase change material, and straw wallboard are 47.6℃, 29.588℃, and 16.004℃, respectively. The temperature drops significantly from the inside to the outside, and the temperature gradient decreases, which shows a good energy storage effect. During the test, the straw brick wallboard reached the lowest temperature at 6 am, and the lowest temperature can still reach about 11℃. Overall, the thermal stability is relatively good. It is worth mentioning that when the water pump stops and the temperature of the phase change material drops during the experimental monitoring, the temperature gradient of the phase change material slows down at about 23℃, and the delay effect can reach more than 3h. The analysis shows that the liquid phase changes to the solid phase, releasing a large amount of latent heat, so it has certain potential in energy storage and mitigating the impact of environmental disturbances.

[0052] During the experiment, considering that the sun rises at about 08:03 and sets at about 06:29 in the afternoon, in order to ensure that the solar collector can fully absorb heat, the phase change energy storage inner wall water pump is turned on from 8:30 to 17:30. After storing energy for 9 hours, it releases energy at night. During the experimental test period, the average heat flux density of the straw wallboard is 25.588W / m^2, and the convection heat dissipation is more significant. Figure 7 and Figure 8 It can be seen that during the operation cycle, the average heat supply of the pipeline of the phase change energy storage inner wall is about 668.69W, and the average heat dissipation of the walls on both sides is 73.69W. From the perspective of the average value, the heat storage capacity is about 2.14×10^7J, which is quite considerable overall. In general, the phase change energy storage inner wall has good heat dissipation performance and good energy storage performance, and there is a large space for utilization in the transfer and utilization of energy.

[0053] The experimental test shows that there are obvious differences between the parameters of the indoor environment and the outdoor environment. The experimental area is the cold heating period in Tianjin, the temperature is low, and the external environment fluctuates greatly, between 1 and 12 ° C. The thermal conductivity of the indoor environment enclosure is 0.29 W / (m·K) and the thickness is 100 mm. Compared with the external wall of the engineering building, the heat transfer of the external wall is more significant. Fig. 9 Observing the temperature curve of the indoor environment, the peak air temperature in the indoor environment can reach 20℃, and the trough can still reach about 11℃. By comparing the internal and external environmental temperatures, the average value differs by 9.9℃, that is, overall, the phase change energy storage inner wall significantly improves the indoor environmental temperature. In addition, due to the influence of rain and snow weather in the last two days of the test cycle, the relative humidity of the environment is relatively high, reaching 55%. When the outdoor ambient temperature is low, the high relative humidity will increase the human body's sense of coldness and cause discomfort. Compared with the relative humidity curve of the laboratory environment, its fluctuation amplitude is significantly reduced, maintaining a fluctuation between 20 and 30%. Specifically, the temperature of the experimental space is significantly increased by the heating of the phase change energy storage inner wall. At night, due to the lower ambient temperature, the temperature is reduced to a certain extent, reaching the lowest temperature of 11℃ in the early morning. The indoor temperature is higher than 18℃ in the comfortable zone from 15:26 to 19:50, and the temperature is greater than 15℃ from 12:55 to 22:40. It has a good heating effect. However, in order to meet the needs of indoor personnel activity comfort, the heat storage performance of the phase change energy storage inner wall needs to be further improved.

[0054] At the same time, in order to explore the impact of the phase change energy storage embedded system on the indoor environment in the non-operating state, the experiment tested the operating and non-operating states and the ambient temperature in the laboratory. The outdoor environment boundary difference in two consecutive days is small, ignoring the impact of external fluctuations, and comparing and analyzing the indoor ambient air temperature parameters in a day cycle, such as Fig.10As shown in the figure, the temperature fluctuation of the baseline group is obviously flat compared with the ambient temperature fluctuation. The phase change energy storage inner wall has a certain effect on regulating the stability of the indoor temperature. The indoor temperature difference between the baseline group and the experimental group is stable at about 14°C. Regardless of the operation energy storage stage or the night energy storage heat release stage, the phase change energy storage inner wall has the effect of significantly increasing the indoor temperature. The operation stage reaches a peak of 19.04°C at around 18:00 in the afternoon, and the indoor temperature still has room for improvement, so the overall thermal performance of the phase change energy storage inner wall needs to be further optimized and improved.

[0055] In order to further explore the thermal insulation effect of aluminum foil film under different heating requirements on both sides of the phase change energy storage inner wall, the temperature of the indoor environment space was tested experimentally. The test results are as follows: Fig.11 . At 8:00 am, a foamed polyethylene aluminum film was added to the cold end side. By comparing and analyzing the ambient temperature in the space (reflective aluminum foil was added to the cold end, but not to the hot end), the results showed that the relative humidity of the cold end and the hot end was 27.8% at 8:00. As the phase change energy storage inner wall pipeline flow was heated, the relative humidity of the cold end increased more slowly, and the relative humidity of the hot end increased with the increase of temperature, and the fluctuation amplitude was higher than that of the cold end air. The average temperature of the cold and hot end air was 12.21℃ and 10.45℃, and the air temperature curve was higher than the cold end air temperature, with a difference of about 2℃. The cold end air showed a disadvantage, but the difference was small, which was related to the poor thermal insulation of the laboratory enclosure. The temperature difference was not obvious due to the large amount of heat loss. In addition, the reflection of the foamed polyethylene aluminum film was relatively weak. In order to reduce the radiation heat transfer from the high temperature side of the phase change energy storage inner wall to the low temperature air space, a mirror reflective film with higher reflectivity (aluminum-plated reflective film and pure aluminum reflective film) was selected to optimize energy efficiency.

[0056] Phase change energy storage inner wall control is based on three parameters to achieve the control of phase change energy storage inner wall, namely temperature, operation time and flow rate, and the effects of different control logics are compared and studied. The three parameter control logics use three levels of parameters to design 27 control scenarios as shown in Table 2. Considering the solar radiation time, the circulating pump is set according to its cycle rise and fall. The sunrise time around January 1, 2024 is 08:13. Therefore, the start-up time is designed to be 9:00. The initial values ​​of pipeline flow and heat transfer physical fields are set to 18℃ for the heating room. The two sides of the room are specified as L and R rooms on the left and right. The focus is on the indoor TSV and the internal energy consumed by the system operation and the energy required for the circulation pump to pressurize. The program sets up the coupling of four physical fields: liquid-solid heat transfer, pipe flow, surface-to-surface radiation, and laminar flow. Since the main research object of the phase change energy storage interior wall is focused on the indoor space, in order to simplify the model, the surface radiation physical field does not consider the outdoor boundary, and is only set for the indoor surface walls and space temperature radiation. The laminar flow physical field mainly refers to the natural convection velocity field formed by the gravity and volume force of the indoor space environment, which in turn leads to an increase in convection heat transfer.

[0057] Table 2 Control rule settings

[0058]

[0059] Fig.12 The temperature change curve of the bedroom under different temperature control strategies is shown. In the initial 0-8h, when the phase change energy storage inner wall is not in operation, the temperature gradually decreases to 16℃. Under the premise that the pipeline flow velocity and operation cycle remain consistent, the different heat medium temperatures cause the room air temperature to be heated to different degrees. Under the working conditions (T, V1, H1), the average room temperature is 20.04℃, 18.74℃, and 17.42℃, respectively, and the temperature rises by about 1.3℃. When the pipeline flow velocity and operation cycle in the control strategy increase, the temperature difference of different temperature control strategies increases to 1.4℃ and 1.8℃. From the peak point of view, the temperature peak value is about 70h, that is, in the early morning, when the water supply heat medium temperature is 55℃, the peak value can reach 23.60℃, which has a good indoor environment temperature effect. From the overall point of view, from the temperature side control system operation, the room temperature rise is more obvious, increasing the pipeline flow heat medium temperature, the large temperature difference leads to an increase in heat exchange, and the ability to regulate the indoor environment is higher. From the perspective of heat release, the higher the temperature of the heat medium inlet, the greater the heat capacity of the phase change energy storage inner wall. Since the phase change material has good latent heat performance at 23°C, the indoor room temperature drops more slowly. When the water supply heat medium temperature is higher than 45°C, the room temperature can basically be kept at no less than 18°C ​​before the next cycle of system operation. In summary, at different temperatures, the ability to adjust the indoor environment is different, which can meet the control in different environments. At the same time, the temperature of the heat medium is different, which can adjust the heat capacity of the energy storage inner wall.

[0060] The effect of the heat medium flow rate in the pipeline flow on heat exchange is somewhat complex. Within a certain range, a faster flow rate results in a larger mass flow rate of the phase change energy storage inner wall, a larger system heat input, and a faster response speed in the system. However, if the heat medium flow rate in the pipeline flow is too fast, the heat medium in the pipeline flow does not fully exchange heat with the pipe wall, and the thermal efficiency is low. Therefore, it is necessary to explore the indoor thermal environment regulation under the flow rate control strategy and reasonably design and adjust the indoor thermal environment. Flow rate control is achieved through a pipeline flow booster pump. Considering pipeline flow noise, heat exchange efficiency, etc., when controlling the temperature in the room by adjusting the flow rate of the heat medium in the pipeline flow, it is necessary to adjust it within a reasonable range. Fig.13From the temperature curves of each wall, it can be seen that compared with the temperature control strategy, the phase change material and wall temperature change curves of different flow rate control strategies fluctuate less. When the temperature is 45°C and the energy storage is 9h, the wall temperature at the beginning and end of the heat storage is 26°C and 20°C respectively. The speed regulation strategy can stabilize the indoor temperature. When considering energy consumption reduction, due to the low sensitivity of the temperature regulation effect, the wall temperature and indoor temperature change little, and the energy consumption can be reduced by reducing the flow rate and reducing the pressure work of the circulating pump.

[0061] Depend on Fig.14 It can be seen from the control of different operation time strategies that the room temperature shows different trends with different operation time, and the room temperature curve fluctuates greatly. Under the (T1, V1) working condition, the lowest temperature in the simulation cycle is 15.3℃, the highest temperature is 18.5℃, and the peak temperature is about 18.5℃, 17.8℃ and 17.3℃ when the operation time is 8h, 9h and 10h. Even if the temperature change trend is adjusted by increasing the operation time, it may be due to the increase of phase change materials and the increase of response time after energy storage optimization, which is not sensitive to time adjustment. When the heat storage is stopped and the heat is released, the room temperature curve shows a difference. While the heat storage time increases, the heat release time decreases, and the overall temperature curve is higher. Under the (T3, V3) working condition, the room temperature of different durations differs by about 1℃, and the lowest temperature reaches about 20℃ in the early morning of the third day. Therefore, through the coordinated control strategy of temperature and operation time, the room thermal environment can reach a more comfortable state.

[0062] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept, which all belong to the protection scope of the present invention.

Claims

1. A thermally activated energy storage inner wall containing phase change material, characterized in that: It includes a temperature regulating layer and two outer protective layers. The outer protective layers are arranged on both sides of the temperature regulating layer. The temperature regulating layer includes straw bricks, phase change tubes and heat-activated water pipes. The phase change tubes are laid in the straw bricks, and the heat-activated water pipes are nested in the phase change tubes. Phase change materials are filled between the inner wall of the phase change tube and the outer wall of the heat-activated water pipe.

2. The thermally activated energy storage inner wall containing phase change material according to claim 1, characterized in that: The outer protective layer is made of gypsum board, cement board, aluminum board, wood board or fiber reinforced board.

3. The thermally activated energy storage inner wall containing phase change material according to claim 1, characterized in that: The bend of the heat activated water pipe is disposed outside the straw brick, and the bend is covered with a heat preservation board.

4. The heat-activated energy storage inner wall containing phase change material according to claim 3, characterized in that: The thermal insulation board is an extruded polystyrene board or a polyurethane foam board or a rock wool board.

5. The thermally activated energy storage inner wall containing phase change material according to claim 3, characterized in that: The insulation board is connected to the bend of the heat-activated water pipe through a connector.

6. The thermally activated energy storage inner wall containing phase change material according to claim 1, characterized in that: The phase change material is paraffin, fatty acid, ester compound or polyol.

7. The thermally activated energy storage inner wall containing phase change material according to claim 1, characterized in that: The straw bricks are composed of multiple pieces, which are bonded together by adhesive.

8. The thermally activated energy storage inner wall containing phase change material according to claim 1, characterized in that: A plurality of through holes are arranged in parallel and at intervals in the straw bricks, and phase change tubes are installed in the through holes. The heat-activated water pipe passes through the axis of the phase change tube, and the turning part of the heat-activated water pipe is not covered by the phase change tube but is covered by an extruded polystyrene board.

9. The thermally activated energy storage inner wall containing phase change material according to claim 8, characterized in that: Two gypsum boards are attached to the outer surfaces of the straw bricks and the extruded polystyrene boards.

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