Building energy-saving air conditioning system

Abstract

The application discloses a building energy-saving air conditioning system, which comprises a ventilation shaft, an underground air pipe, a Trombe wall, a sky radiation layer and a heat storage layer; the heat storage layer is arranged at the top of the ventilation shaft; the Trombe wall is arranged at the sunny side of the ventilation shaft and is arranged close to the top of the ventilation shaft; the sky radiation layer is arranged at the shady side of the ventilation shaft and is arranged close to the bottom of the ventilation shaft; the underground air pipe is used for being communicated with or being cut off from the bottom of the ventilation shaft, so that the inside of the ventilation shaft can form a temperature difference and drive air to flow from bottom to top; a condensing surface is arranged in the ventilation shaft and is located on an air flow path, so as to dehumidify the air. The building energy-saving air conditioning system is coupled with passive cooling and dehumidification and is composed of the underground air pipe, the sky radiation, the Trombe wall, the phase change heat storage and the condensing surface, and can realize the effects of cooling and dehumidification by relying on renewable low-grade natural energy without the mechanical driving of a fan or a compressor.

Description

Technical Field

[0001] This application relates to the field of passive cooling and dehumidification technology in buildings, and in particular to an energy-saving air conditioning system for buildings. Background Technology

[0002] In building energy consumption, air conditioning systems typically account for about 40%. Traditional refrigeration relies on compressors and refrigerants, resulting in high energy consumption, large carbon emissions, and exacerbation of the urban heat island effect.

[0003] In response, the relevant technology CN114151879B—a portable passive dehumidification system suitable for tents—utilizes nighttime radiant cooling to condense the hot and humid air inside the tent into water droplets, which are then expelled. However, it relies solely on sky radiation and cannot operate during the day.

[0004] In addition, there is a related technology CN108644928A - a solid adsorption dehumidification device with continuous moisture absorption and intermittent regeneration. Its moisture absorption stage requires no energy consumption, but the regeneration stage requires electric heating and compressor cooling. It is not completely passive and requires external energy to drive regeneration, resulting in a complex structure. Summary of the Invention

[0005] This application proposes a building energy-saving air conditioning system to effectively solve the technical problems of related technologies, such as the inability to operate 24 / 7 and high energy consumption.

[0006] The first aspect of this application provides a building energy-saving air conditioning system, including: a ventilation shaft, a tunnel duct, a Trumbo wall, a sky radiation layer, and a heat storage layer;

[0007] The heat storage layer is disposed at the top of the ventilation shaft;

[0008] The Trumbull wall is located on the sun-facing side of the ventilation shaft and is positioned relatively close to the top of the ventilation shaft;

[0009] The sky radiation layer is located on the shaded side of the ventilation shaft and relatively close to the bottom of the ventilation shaft;

[0010] The underground ventilation duct is used to connect to or disconnect from the bottom of the ventilation shaft so that a temperature difference can be formed inside the ventilation shaft and drive air to flow from bottom to top.

[0011] The ventilation shaft is equipped with a condensation surface, which is located in the airflow path to dehumidify the air.

[0012] Furthermore, the sky radiation layer is inclined, with at least a portion of the sky radiation layer serving as the condensation surface.

[0013] Furthermore, a collection trough is provided at the bottom of the ventilation shaft, which is located below the condensation surface and is used to collect condensate.

[0014] Furthermore, the sun-facing side of the ventilation shaft is configured with a light-transmitting enclosure structure, the Trumbo wall is positioned relatively close to the upper end of the light-transmitting enclosure structure, and the lower end of the light-transmitting enclosure structure is opposite to the sky radiation layer.

[0015] Furthermore, the sky radiation layer is provided with a cold end outlet, and the upper end of the shaded side of the ventilation shaft is provided with a hot end inlet, and the hot end inlet is arranged opposite to or close to the Trumbo wall.

[0016] Furthermore, the underground ventilation duct is equipped with a valve, which is used to connect or disconnect the underground ventilation duct from the bottom of the ventilation shaft.

[0017] Furthermore, the heat storage layer is made of a phase change material.

[0018] Furthermore, the top of the ventilation shaft is provided with an air outlet, and a filter screen is provided at the air outlet.

[0019] Furthermore, the exterior of the Trumbo wall is equipped with a roller shutter that can be opened or closed.

[0020] Furthermore, the method of using a building energy-saving air conditioning system includes the following steps:

[0021] In daytime mode, the underground air duct is connected to the bottom of the ventilation shaft to provide a cold source. The sky radiation layer serves as a reflective surface, the Trumbo wall is heated by the sun, the heat storage layer absorbs and stores heat, and a temperature difference is formed in the ventilation shaft to drive the air to flow from bottom to top.

[0022] In night mode, the underground air duct is cut off from the bottom of the ventilation shaft, the sky radiation layer outputs a cold source, the heat storage layer releases heat, and the Trumbo wall releases heat, so as to create a temperature difference in the ventilation shaft that drives the air to flow from bottom to top.

[0023] As can be seen from the above technical solutions, the embodiments of this application have at least the following beneficial effects: the building energy-saving air conditioning system, which is a coupled passive cooling and dehumidification system composed of underground wind, sky radiation, Trumbo wall, phase change heat storage and condensation surface, can achieve the effect of cooling and dehumidification entirely by relying on renewable low-grade natural energy without mechanical drive such as fans or compressors.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional view of a building energy-saving air conditioning system provided in one embodiment of this application.

[0027] Figure label:

[0028] 100. Ventilation shaft; 110. Filter screen; 120. Light-transmitting enclosure structure; 130. Cold end outlet; 140. Hot end inlet;

[0029] 200. Underground ventilation duct; 210. Valve;

[0030] 300. The Trumbo Wall;

[0031] 400. The radiative layer of the sky;

[0032] 500, heat storage layer;

[0033] 600. Collection tank;

[0034] 700. Roller blind. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] See Figure 1 As shown, an embodiment of the first aspect of this application discloses a building energy-saving air conditioning system, including a ventilation shaft 100, a tunnel duct 200, a Trumbo wall 300, a sky radiation layer 400, and a heat storage layer 500;

[0037] A heat storage layer 500 is disposed at the top of the ventilation shaft 100; a Trumbo wall 300 is disposed on the sunny side of the ventilation shaft 100 and relatively close to the top of the ventilation shaft 100; a sky radiation layer 400 is disposed on the shaded side of the ventilation shaft 100 and relatively close to the bottom of the ventilation shaft 100; a duct 200 is used to connect to or disconnect from the bottom of the ventilation shaft 100 so that a temperature difference can be formed inside the ventilation shaft 100 and drive air to flow from bottom to top; a condensation surface is provided inside the ventilation shaft 100, which is located on the air flow path for dehumidifying the air.

[0038] In the embodiments of this application, a coupled passive cooling and dehumidification building energy-saving air conditioning system is formed by underground wind, sky radiation, Trumbo wall 300, material heat storage and condensation surface. It can achieve the effect of cooling and dehumidification entirely by relying on renewable low-grade natural energy and without mechanical drive such as fans or compressors.

[0039] Understandably, by integrating multiple sources of low-grade energy, including underground ventilation, radiant cooling, and phase change materials, all-weather passive cooling and dehumidification can be achieved. Through the building-integrated ventilation shaft 100, this system can directly serve permanent buildings such as residences, granaries, and subway stations. Furthermore, the building energy-saving air conditioning system of this application embodiment operates entirely passively, requiring no external energy or mechanical components, reducing system complexity and carbon emissions, completely eliminating vulnerable components such as fans, sensors, and electric heaters, and achieving maintenance-free operation as much as possible.

[0040] It should be noted that the heat storage layer 500 works in conjunction with the Transporal wall 300 to collect and store heat at the top of the sunny side, while the sky radiation layer 400 is located at the bottom of the shaded side. It reflects sunlight when it's sunny and dissipates heat and provides a cooling source when there's no sunlight. Combined with the on / off control of the underground duct 200—connected during the day and disconnected at night—this creates a temperature difference within the ventilation shaft 100, forming a natural driving force. This temperature difference drives air to flow from bottom to top, with the condensation surface located in the airflow path, precisely intercepting the flowing air for targeted dehumidification, removing excess moisture from the air. By relying on natural temperature difference to drive airflow, there's no need to rely on electrically powered fans, significantly reducing the energy consumption of the air conditioning system and meeting building energy conservation requirements. Furthermore, the heat storage layer 500 buffers temperature fluctuations, and the combination of the Transporal wall 300's heat collection and the sky radiation layer 400 keeps the indoor temperature within a comfortable range, reducing sudden temperature rises and falls and improving living or usage comfort. This system utilizes natural energy sources such as solar energy, geothermal energy, and radiant cooling from the sky, along with the principle of natural ventilation, resulting in zero pollutant emissions and combining environmental friendliness with sustainability.

[0041] In some embodiments, the underground ventilation, sky radiation, Trumbo wall 300, and phase change material are integrated into a single passive system, forming a multi-source coupled architecture. Furthermore, dual redundant cold sources can be configured to ensure normal system operation. For example, if sky radiation fails at night or on cloudy days, the valve 210 of the underground ventilation duct 200 can be manually / automatically reopened to achieve cold source backup. Furthermore, if the diurnal temperature difference is small, the radiant collector (pre-stored heat during the day) can be activated to raise the upper temperature, achieving the dual goals of cooling and dehumidification without any external energy.

[0042] In some embodiments, the ventilation shaft 100 of this application is a vertical building shaft, which does not occupy additional land and does not affect the facade design. The cross-section of the ventilation shaft 100 can be linearly enlarged according to the building load to directly serve various types of buildings, realizing the integration of the building envelope. Furthermore, the ventilation shaft 100 of this application can be modularly set up and combined with the design of fresh air, smoke exhaust and light wells, and can also be compatible with roof photovoltaic and underground preheating / precooling systems.

[0043] Based on the dual-source coupling of daytime underground ventilation and nighttime sky radiation in this application embodiment, the diurnal temperature difference is continuously driven, and no temperature and humidity runaway was observed during 7 consecutive days of operation. For example, using a 300mm Transylvanian wall and a 500mm heat storage layer to maintain the upper part at ≥30℃, and underground ventilation / sky radiation to maintain the lower part at ≤18℃, a stable temperature difference of ≥8℃ is formed. The measured air exchange rate is 3.2 ACH, and the indoor CO2 concentration is reduced by 450ppm.

[0044] The following will combine Figure 1 The energy-saving air conditioning system for buildings disclosed in the embodiments of this application will be explained and described in detail.

[0045] In some embodiments of this application, the sky radiation layer 400 is inclined, with at least a portion of the sky radiation layer 400 serving as a condensation surface. It is understood that this inclined layout of the sky radiation layer retains the heat dissipation function of the shaded bottom while reusing at least a portion of its area as a condensation surface, eliminating the need for additional independent condensation components and simplifying the system structure. The inclined design increases the contact area with the flowing air within the ventilation shaft 100, allowing the airflow to more fully sweep across the condensation surface, while also facilitating the natural drainage of condensate along the inclined surface, preventing water accumulation.

[0046] In some embodiments, a 2° inclined hydrophobic condensation surface combined with gravity water conduction is used, with a 24-hour dehumidification capacity of 1 kg / m², a 15% reduction in peak relative humidity, and a reduction of one level in the mold index.

[0047] It should be understood that in order to further improve the dehumidification effect of the system, the collection and discharge of condensate is the key to achieving the above effect. To this end, the bottom of the ventilation shaft 100 is provided with a collection tank 600, which is located below the condensation surface and is used to collect condensate.

[0048] Understandably, the collection tank 600 is positioned below the condensation surface to specifically collect condensate dripping from it, preventing water from scattering randomly. Collecting the condensate facilitates subsequent unified drainage, preventing water from remaining or spreading at the bottom of the ventilation shaft 100. The collection tank 600 helps keep the condensation surface and the interior of the ventilation shaft 100 dry, preventing water accumulation from affecting the heat dissipation and dehumidification function of the sky radiation layer 400, while also protecting the inner wall of the ventilation shaft 100 from moisture erosion.

[0049] In some embodiments, zero-energy dehumidification is achieved by combining a condensation surface with gravity drainage, eliminating the need for compression machinery or desiccants. Specifically, the condensation surface can be equipped with an anti-scaling coating, which is a fluorocarbon hydrophobic coating (contact angle >110°) to ensure durability and prevent aging. The collection tank 600 has a self-cleaning slope and a water seal to prevent mosquitoes and odors from flowing back.

[0050] In some embodiments of this application, the sun-facing side of the ventilation shaft 100 is configured as a light-transmitting enclosure structure 120, the Trumbo wall 300 is positioned relatively close to the upper end of the light-transmitting enclosure structure 120, and the lower end of the light-transmitting enclosure structure 120 is opposite to the sky radiation layer 400.

[0051] Understandably, the light-transmitting enclosure structure 120 combines light transmission and enclosure functions, allowing solar energy to penetrate into the ventilation shaft 100 and providing a heat collection channel for the sun-facing side. Together with the Trumbo wall 300 located relatively close to its upper end, it efficiently captures solar radiation heat and improves the top heat storage efficiency. The lower end of the light-transmitting enclosure structure 120 is opposite to the sky radiation layer 400. During the day, the sky radiation layer 400 acts as a reflective and condensation surface, strengthening the temperature gradient between the upper and lower parts of the ventilation shaft 100 and enhancing the power of self-driven airflow.

[0052] For example, in some embodiments, the sky radiation layer 400 is provided with a cold end outlet 130, and the upper end of the shaded side of the ventilation shaft 100 is provided with a hot end inlet 140, with the hot end inlet 140 being disposed opposite to or close to the Transporus wall 300. It is understood that the hot end inlet 140 is positioned close to or directly opposite the Transporus wall 300, precisely matching the Transporus wall 300 to increase the air temperature at the top of the ventilation shaft 100 and enhance the heat collection effect at the hot end. The cold end outlet 130 of the sky radiation layer 400 can discharge cooled air after heat dissipation; the two interfaces correspond to the hot end inlet and the cold end outlet respectively, thereby optimizing the air circulation path.

[0053] In some embodiments, the cold end outlet 130 is used to provide cool air to the room, and the hot end inlet 140 is used to exhaust hot air from the room. This can be achieved through structures such as building ducts to allow air flow and circulation.

[0054] In some embodiments, a valve 210 is provided on the underground duct 200, which is used to connect or disconnect the underground duct 200 from the bottom of the ventilation shaft 100. It is understood that the valve 210 precisely controls the connection / disconnection between the underground duct 200 and the bottom of the ventilation shaft 100, switching the participation mode of the underground duct 200 as needed and flexibly adjusting the system's air circulation path. Specifically, a control device or manual control can be configured to switch the connection between the underground duct 200 and the bottom of the ventilation shaft 100.

[0055] For example, in some embodiments, the heat storage layer 500 is made of a phase change material, specifically a phase change heat storage material such as PCM.

[0056] For example, in some embodiments, the top of the ventilation shaft 100 is provided with an air outlet, and a filter screen 110 is provided at the air outlet for air intake and filtering of impurities.

[0057] In some embodiments of this application, a roller shutter 700 that can be opened or closed is provided outside the Trumbo wall 300. It is understood that the roller shutter 700 is typically closed during the day to allow sufficient heat to be stored and a temperature difference to be formed within the ventilation shaft 100, and is opened at night for heat preservation.

[0058] In other embodiments, the roller shutter 700 can be flexibly opened and closed to block solar radiation as needed, preventing excessive heat collection by the Transporal wall 300 and preventing abnormal temperature rise at the top of the ventilation shaft 100. Furthermore, it can be precisely coordinated with the heat collection function of the Transporal wall 300, opening when enhanced heat collection is needed on sunny days and closing on cloudy days or during high-temperature periods, adjusting the heat collection intensity to meet the needs.

[0059] For example, in some embodiments, the day and night operation modes are switched by the roller shutter 700 and the valve 210 without manual intervention. The roller shutter 700 includes a shape memory alloy spring temperature control mechanism. When the temperature at the top of the ventilation shaft 100 is >35°C, the roller shutter 700 is automatically closed, and when it is <25°C, it is automatically opened. No electronic control is required, thus avoiding misoperation.

[0060] Furthermore, the method of using a building energy-saving air conditioning system includes the following steps:

[0061] In daytime mode, the bottom of the underground air duct 200 is connected to the ventilation shaft 100 to provide a cold source. The sky radiation layer 400 serves as a reflective surface, the Trumbo wall 300 is heated by the sun, the heat storage layer 500 absorbs and stores heat, and a temperature difference is formed in the ventilation shaft 100 to drive the air to flow from bottom to top.

[0062] In night mode, the bottom of the underground air duct 200 and the ventilation shaft 100 are cut off, the sky radiation layer 400 outputs a cold source, the heat storage layer 500 releases heat, and the Trumbo wall 300 releases heat, so as to create a temperature difference in the ventilation shaft 100 that drives the air to flow from bottom to top.

[0063] In one specific embodiment, during the summer daytime mode: outdoor fresh air is delivered to the bottom of ventilation shaft 100 after being cooled and filtered through underground ducts. A temperature difference is created between the bottom and top of the shaft, where it is heated by the Transporal wall 300, glass, and phase change material, driving the air to flow upwards and carrying away the hot and humid indoor air. The condensate from the sky radiation coating and the cold storage box is collected and discharged, while the roller shutter 700 prevents direct sunlight. When valve 210 opens, underground air 8 enters the bottom of ventilation shaft 100. The sky radiation coating only acts as a reflective surface, the roller shutter 700 closes, the Transporal wall 300 is heated by the sun, and the phase change heat storage material absorbs and stores heat. With a temperature difference ≥8℃ between the top and bottom, the chimney effect drives the hot and humid indoor air to rise → contact the inclined condensation surface → condensate flows down the slope into the collection tank 600 → and is discharged into the municipal pipe network. Actual measurement: supply air temperature 20℃, relative humidity drops from 85% to 70%.

[0064] Summer Nighttime Mode: Valve 210 is closed to cut off underground airflow and prevent reverse heat transfer. The roller shutter 700 is opened, and the sky radiation coating radiates heat to the sky, lowering the cold end temperature to 15℃; the phase change heat storage material releases heat to maintain the upper end temperature ≥28℃. The chimney effect continues, dehumidifying 0.8 kg / m² even at night. If the day-night temperature difference is small, the radiant collector (pre-stored heat during the day) can be activated to raise the upper end temperature by 2-3℃, requiring no external energy source.

[0065] The building energy-saving air conditioning system of this application is described in detail below with a specific embodiment. It should be noted that the following embodiment is merely an exemplary description and should not be construed as limiting the embodiments of this application.

[0066] See Figure 1 As shown, the building energy-saving air conditioning system of this embodiment is a passive cooling and dehumidification structure coupled with underground ventilation, sky radiation, and a Transuber wall 300. Specifically, it includes five modules: an inclined ventilation shaft 100, underground air ducts, a sky radiation coating, a Transuber heat collection wall, and a phase change heat storage layer 500. The structure combines the underground ventilation cold source, the nighttime sky radiation cold source, and the Transuber wall 300 / phase change material heat source. Through a natural circulation channel driven by the temperature difference of the ventilation shaft 100 and the top heat collection and bottom cold storage, a fanless system for the rising, condensing, and exhausting of hot and humid air is formed, achieving integrated passive cooling and dehumidification of the building using low-grade energy.

[0067] In some embodiments, the upper outer section of the well wall is equipped with a double-layered glass Trumbert wall 300, embedded with a dark-colored heat-absorbing plate and phase-change gypsum board. During the day, it absorbs solar radiation and stores heat, forming a heat source of 40-50°C. The lower inner section is covered with a high-emissivity sky radiation coating. During the day, 18-22°C underground air is introduced through the underground double-walled corrugated pipes. At night, the coating radiates heat to the cold air, and the bottom temperature can be reduced to 5-8°C lower than the outdoor temperature, forming a continuous cold source. The density difference caused by the temperature difference between the upper and lower parts of the well drives the hot and humid air inside to flow naturally from bottom to top. The hot and humid air condenses into water when it encounters the cold wall surface, and flows into the bottom water tank along the wall surface with an inclination angle of ≥5° and is discharged, achieving the dual goals of cooling and dehumidification. The system relies entirely on renewable low-grade natural energy, without the need for mechanical drives such as fans or compressors, and has an annual energy saving rate of >42%, making it particularly suitable for hot and humid areas in the south.

[0068] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0069] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more. It should be noted that the term "and / or" used herein is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Similarly, at least one of A or B can also represent: A alone, A and B simultaneously, or B alone.

[0070] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0071] In the foregoing description of this specification, references to terms such as "one embodiment," "another embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A building energy-saving air conditioning system, characterized in that, include: Ventilation shafts, underground air ducts, Trumbo walls, sky radiation layers, and heat storage layers; The heat storage layer is disposed at the top of the ventilation shaft; The Trumbull wall is located on the sun-facing side of the ventilation shaft and is positioned relatively close to the top of the ventilation shaft; The sky radiation layer is located on the shaded side of the ventilation shaft and relatively close to the bottom of the ventilation shaft; The underground ventilation duct is used to connect to or disconnect from the bottom of the ventilation shaft so that a temperature difference can be formed inside the ventilation shaft and drive air to flow from bottom to top. The ventilation shaft is equipped with a condensation surface, which is located in the airflow path to dehumidify the air. The sky radiation layer is inclined, and at least a portion of the sky radiation layer serves as the condensation surface; The heat storage layer is made of phase change material.

2. The building energy-saving air conditioning system according to claim 1, characterized in that: The bottom of the ventilation shaft is provided with a collection tank, which is located below the condensation surface and is used to collect condensate.

3. The building energy-saving air conditioning system according to claim 1, characterized in that: The sun-facing side of the ventilation shaft is configured with a light-transmitting enclosure structure, the Trumbo wall is positioned close to the upper end of the light-transmitting enclosure structure, and the lower end of the light-transmitting enclosure structure is opposite to the sky radiation layer.

4. The building energy-saving air conditioning system according to claim 3, characterized in that: The sky radiation layer is provided with a cold end outlet, and the upper end of the shaded side of the ventilation shaft is provided with a hot end inlet, and the hot end inlet is set opposite to or close to the Trumbo wall.

5. The building energy-saving air conditioning system according to claim 1, characterized in that: The underground ventilation duct is equipped with a valve, which is used to connect or disconnect the underground ventilation duct from the bottom of the ventilation shaft.

6. The building energy-saving air conditioning system according to claim 1, characterized in that: The ventilation shaft is provided with an air outlet at the top, and a filter screen is provided at the air outlet.

7. The building energy-saving air conditioning system according to claim 1, characterized in that: The exterior of the Trumbo wall is equipped with a roller shutter that can be opened or closed.

8. A method of using the building energy-saving air conditioning system as described in any one of claims 1 to 7, characterized in that, Includes the following steps: In daytime mode, the underground air duct is connected to the bottom of the ventilation shaft to provide a cold source. The sky radiation layer serves as a reflective surface, the Trumbo wall is heated by the sun, the heat storage layer absorbs and stores heat, and a temperature difference is formed in the ventilation shaft to drive the air to flow from bottom to top. In night mode, the underground air duct is cut off from the bottom of the ventilation shaft, the sky radiation layer outputs a cold source, the heat storage layer releases heat, and the Trumbo wall releases heat, so as to create a temperature difference in the ventilation shaft that drives the air to flow from bottom to top.

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