Energy-saving integrated heat collecting and heat removing envelope and heat collecting and heat removing adjusting method thereof

Abstract

This invention discloses an integrated energy-saving building envelope structure for heat collection and dissipation, and its heat collection and dissipation regulation method. The structure includes: a roof subsystem comprising a roof radiant layer and a roof structural layer, a cavity between them, and a communication device for air circulation and isolation between the interior and the cavity. The roof radiant layer includes several inclined, side-by-side double-sided louvered radiant units. Each double-sided louvered radiant unit includes a condenser tube, a central tube rotatably fitted onto the condenser tube, and louvers on both sides of the central tube. One side of the louver is provided with a sky radiation cooling material, and the other side with a solar heat collection material. The wall subsystem includes a wall and evaporator tubes disposed within the wall. The upper end of the evaporator tube is connected to the lower end of the corresponding condenser tube, and the evaporator tube is used to store a heat-conducting medium that can absorb heat and evaporate. This invention can fully utilize natural energy to meet heating and cooling needs in both summer and winter, reducing system complexity and cost.

Description

Technical Field

[0001] This invention belongs to the field of building energy conservation, specifically relating to an integrated energy-saving building envelope for heat collection and dissipation and its heat collection and dissipation regulation method. Background Technology

[0002] As people's living standards improve, more and more energy is being used for building heating and cooling to ensure indoor thermal comfort. In recent years, building energy consumption has been rising continuously, now accounting for about 40% of global energy consumption. Building greenhouse gas emissions account for nearly one-third of global greenhouse gas emissions, triggering a series of ecological problems such as global warming. Countries around the world are calling for reducing carbon emissions and improving the energy efficiency of building systems. Faced with the increasingly severe energy utilization situation, developing new and efficient building energy-saving technologies and increasing the application of natural energy in building systems has become the future trend of building energy conservation.

[0003] In building energy systems, heating and air conditioning account for over 40% or even higher of energy consumption, presenting enormous potential for energy conservation and carbon reduction. Furthermore, in the building sector, solar radiation is one of the most abundant, clean, and economical natural energy sources, making it an ideal heat source for building systems. Sky radiation cooling technology, a passive cooling technology utilizing long-wave cosmic radiation, has also been widely applied to building cooling in recent years. Moreover, in building systems, the performance of the building envelope directly affects the building load, and consequently, the energy consumption of the building's heating and air conditioning system. Therefore, applying these two natural energy sources—solar radiation heat and sky radiation cooling—to the building envelope can effectively reduce the direct consumption of high-grade energy sources such as electricity by building heating and air conditioning systems, and has gained widespread favor among scholars. For example, in cold winters, solar radiation can be used to heat the building roof to reduce roof heat loss, or solar collectors can be used to produce hot water which is then transported to the building envelope (roof, walls) for insulation. In hot summers, sky radiation cooling technology can be used to cool the roof and reduce indoor heat gain, or radiant coolers can be used to produce cold water to cool the building envelope, thereby reducing indoor load.

[0004] Although solar radiation heating and radiant cooling are applied to building envelopes, they can currently only meet a single building need for either cooling or heating; that is, they are only applicable during a single cooling or heating season and cannot guarantee good energy-saving effects in both seasons. For example, solar roofs are basically inoperable in summer, and radiant cooling roofs cause even greater heat loss in winter.

[0005] Building roofs, as an important component of the building envelope, are the primary area in a building system for acquiring natural energy sources such as solar radiation heat and sky radiation cooling. However, due to limited building area, combining independent solar energy utilization systems with sky radiation cooling systems would inevitably lead to resource waste and increase the complexity and construction cost of the building system. On the other hand, China has a vast territory, with many regions and cities requiring heating in winter and air conditioning in summer, resulting in extremely large building volumes. Current single solar energy utilization or sky radiation cooling technologies are no longer sufficient to meet the application needs of energy-saving and low-carbon buildings in these areas.

[0006] Therefore, carbon neutrality is an important goal that urgently needs to be achieved. Reducing building energy consumption is the task of every building professional. It is particularly important to design an energy-saving building envelope that meets the heating and cooling needs of summer and winter, is based on the use of natural energy, and does not increase the complexity of the building system or construction costs within a limited building area. Summary of the Invention

[0007] The purpose of this invention is to provide an integrated heat collection and heat dissipation energy-saving building envelope structure, and a heat collection and heat dissipation regulation method based on the above structure. This application can make full use of natural energy to meet heating and cooling needs in both summer and winter, reduce building heating and air conditioning energy consumption, achieve year-round reduction of building energy consumption, make full use of the limited roof area, and reduce the complexity and cost of the system.

[0008] The technical solution adopted in this invention is: An integrated heat collection and heat dissipation energy-saving building envelope includes a roof subsystem and a wall subsystem. The roof subsystem includes a roof radiant layer facing the outside, a roof structural layer facing the inside, a cavity between the roof radiant layer and the roof structural layer, and a communication device for realizing air circulation and isolation between the interior and the cavity. The roof radiant layer includes several inclined and side-by-side double-sided louvered radiant units. Each double-sided louvered radiant unit includes a fixed condenser tube, a central tube rotatably fitted on the condenser tube, and louvers on both sides of the central tube. One side of the louver serves as a heat dissipation surface and is equipped with sky radiation cooling material, while the other side serves as a heat collection surface and is equipped with solar heat collection material. Flipping the louvers can switch the working surface of the louvers, and heat can be conducted sequentially between the louvers, the central tube, and the condenser tube. The wall subsystem includes a wall facing the outside and evaporator tubes installed in the wall. The evaporator tubes are distributed along the wall and their upper ends are connected to the lower ends of the corresponding condenser tubes. The evaporator tubes are used to store a heat-conducting medium that can absorb heat and evaporate.

[0009] Preferably, the connecting device includes an air duct on the roof structure layer connecting the cavity and the room, an air valve on the air duct for controlling the opening and closing of the air duct, and a fan on the air duct for realizing the circulation of air between the cavity and the room.

[0010] Preferably, a bearing is fitted between the central tube and the condenser tube, and the space between them is filled with a lubricating oil with excellent thermal conductivity and the lubricating oil leakage is prevented by an end seal.

[0011] Preferably, the sky radiation cooling material has high long-wave emissivity and solar radiation reflectivity, and is a material that combines an organic radiation cooling film with metallic silver.

[0012] Preferably, the solar thermal collector material has a high solar radiation absorption rate and is made of black chromium oxide.

[0013] Preferably, the heat transfer medium stored in the evaporator tube is Freon R11 or pentane.

[0014] Preferably, the louvers and the central tube are made of aluminum alloy, while the condenser and evaporator are made of copper, with the corresponding condenser and evaporator located in different areas of the same bent copper tube.

[0015] Preferably, the roof radiation layer covers the entire building roof, and the width of a single double-sided louvered radiation unit is 200~400mm.

[0016] Preferably, the tilt angle of the double-sided louvered radiating unit is 3°~5°.

[0017] A method for regulating heat collection and dissipation, based on the aforementioned integrated energy-saving building envelope structure for heat collection and dissipation: When cooling is required during seasons with higher ambient temperatures, the heat dissipation surface of the louvers in the roof radiant layer faces upwards. During the day, the heat dissipation surface reflects solar radiation and cools the building through long-wave radiation from the sky, reducing the heat gain from solar radiation on the roof. Furthermore, the connecting device isolates the interior from the cavity, creating an insulating air layer within the cavity for indoor insulation. Simultaneously, as the wall temperature rises, the evaporator pipes inside the wall absorb heat from the wall, and the internal heat transfer medium absorbs heat from the evaporator pipes and evaporates into the condenser pipes. The heat from the heat transfer medium is transferred to the louvers through the condenser pipes and the central pipe, and then dissipated to the sky through the heat dissipation surface. After heating, the condenser flows back to the evaporator to achieve circulating heat dissipation in the wall. At night, the connecting device circulates the air between the room and the cavity. The heat in the room is transferred to the cavity through the air circulation, and the heat in the cavity is transferred to the louvers and discharged to the outside through the heat dissipation surface, thus achieving active heat dissipation in the room and reducing the indoor cooling load. At the same time, since there is still heat stored in the wall, the evaporator in the wall absorbs heat from the wall, and the internal heat transfer medium absorbs heat from the evaporator and evaporates into the condenser. The heat of the heat transfer medium is transferred to the louvers through the condenser and the central tube, and then discharged to the sky through the heat dissipation surface. After the heat transfer medium loses heat, it condenses and flows back to the evaporator to achieve circulating heat dissipation in the wall. When heating is needed during seasons with lower ambient temperatures, the heat-collecting surfaces of the louvers in the roof radiant layer are positioned upwards: During the day, the heat-collecting surfaces absorb solar radiation to heat the louvers, which in turn heat the cavity. Furthermore, the connecting device allows air circulation between the interior and the cavity, transferring heat from the cavity to the interior through air circulation, thereby raising the indoor temperature and reducing the indoor heat load. At night, the connecting device isolates the interior from the cavity, creating an insulating air layer within the cavity to insulate the interior and reduce building heat loss.

[0018] The beneficial effects of this invention are: This application fully utilizes natural energy to meet heating and cooling needs in both summer and winter, reducing building heating and air conditioning energy consumption and achieving year-round reduction in building energy consumption. It also makes full use of the limited roof area, reducing system complexity and cost: the roof radiant layer uses multiple modular, independent units, reducing the space required for rotation and maximizing roof area while minimizing space requirements; the heat dissipation and collection surfaces are located on opposite sides of the louvers, allowing switching of working surfaces by flipping the louvers. Therefore, in summer when cooling is needed, the heat dissipation surface can face upwards to reduce indoor heat gain and lower the building's cooling load; in winter when heating is needed, the collection surface can face upwards to raise the indoor temperature and lower the building's heating load, thus meeting heating and cooling needs in both summer and winter; the connecting device allows for communication between the interior and the cavity. The cavity provides space for the louvers to rotate while also forming an insulating air layer, reducing heat gain or loss from roof heat transfer. In the air-circulating state, indoor air can directly contact the louvers for heat exchange, achieving active heat collection and dissipation, thus improving the efficiency of natural energy utilization. The evaporator, condenser, and heat transfer medium, as highly efficient heat transfer components, can transfer large amounts of heat under low-temperature conditions. In summer, they can transfer heat from the wall to the louvers and dissipate it to the sky through the heat dissipation surface, achieving circulating heat dissipation from the wall. This solves the problem that traditional radiant cooling can only reduce the roof's cooling load and can also passively cool the building's exterior walls, further reducing the building's indoor cooling load. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the integrated heat collection and heat dissipation energy-saving enclosure structure in an embodiment of the present invention. For ease of observation, the evaporation pipes inside the wall are visible.

[0020] Figure 2 This is a schematic diagram of the structure of the double-sided louvered radiating unit in an embodiment of the present invention.

[0021] Figure 3 This is a cross-sectional schematic diagram of the integrated heat collection and heat dissipation energy-saving enclosure structure in an embodiment of the present invention. The roof structure layer and the wall are viewed from a cross-sectional perspective, and the two sides of the double-sided louvered radiation unit are viewed from a cross-sectional perspective.

[0022] In the diagram: 1-Double-sided louvered radiant unit; 11-Heat exhaust surface; 12-Louvre plate; 13-Heat collection surface; 14-Central tube; 15-Condenser tube; 16-End seal; 17-Bearing; 2-Evaporator tube; 3-Wall; 4-Roof structural layer; 5-Cavity; 6-Connecting device; 61-Air duct; 62-Air valve; 63-Fan; A-Heat transfer medium; B-Lubricating oil. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Example 1 This embodiment discloses an integrated energy-saving building envelope structure for heat collection and dissipation, such as... Figures 1 to 3 As shown, the system includes a roof subsystem and a wall subsystem. The roof subsystem includes a roof radiant layer, a roof structural layer 4, a cavity 5, and a connecting device 6. The wall subsystem includes a wall 3 and an evaporator pipe 2. The roof radiant layer faces outwards, the roof structural layer 4 faces inwards, and the cavity 5 is located between the roof radiant layer and the roof structural layer 4. Figure 3 The roof radiant layer includes several inclined and side-by-side double-sided louvered radiant units 1. Each double-sided louvered radiant unit 1 includes a fixed condenser tube 15, a central tube 14 rotatably fitted onto the condenser tube 15, and louvered plates 12 on both sides of the central tube 14. One side of the louvered plate 12 serves as a heat dissipation surface 11 and is provided with sky radiation cooling material, while the other side serves as a heat collection surface 13 and is provided with solar energy collection material. Flipping the louvered plate 12 can switch the working surface of the louvered plate 12. Heat can be conducted sequentially between the louvered plate 12, the central tube 14, and the condenser tube 15. See [link to relevant documentation]. Figures 1 to 3 The connecting device 6 is used to achieve air circulation and isolation between the indoor space and the cavity 5, see [link / description]. Figure 3 The wall 3 faces outwards, and the evaporator pipes 2 are installed inside the wall 3. The evaporator pipes 2 are distributed along the wall 3, and their upper ends are connected to the lower ends of the corresponding condenser pipes 15. The evaporator pipes 2 are used to store the heat-conducting medium A that can absorb heat and evaporate. (See...) Figure 1 and Figure 3 .

[0025] Regarding the connecting device 6, in this embodiment, preferably: as follows: Figure 3 As shown, the connecting device 6 includes a duct 61 on the roof structure layer 4 that connects the cavity 5 and the room, a valve 62 on the duct 61 for controlling the opening and closing of the duct 61, and a fan 63 on the duct 61 for realizing the air circulation between the cavity 5 and the room. The number and arrangement of the duct 61, the valve 62, and the fan 63 are set according to actual needs.

[0026] Regarding the installation between the central tube 14 and the condenser tube 15, in this embodiment, preferably: as follows: Figure 3As shown, the central tube 14 and the condenser tube 15 are fitted with a bearing 17, and the space between them is filled with a lubricating oil B with excellent thermal conductivity. The lubricating oil B is prevented from leaking through the end seal 16. On the one hand, this can ensure the normal rotation of the central tube 14 and the louvered plate 12, and on the other hand, it can enhance the heat transfer effect.

[0027] In this embodiment, the sky radiation cooling material has a high long-wave (8~13µm) emissivity (~0.9) and solar radiation reflectivity (0.9~0.95), and is preferably a material combining an organic radiation cooling film and metallic silver. The solar heat collection material has a high solar radiation absorptivity (~0.9), and is preferably a black chromium oxide material. Both the sky radiation cooling material and the solar heat collection material are attached to the louvered plate 12.

[0028] In this embodiment, the heat-conducting medium A stored in the evaporator tube 2 is preferably Freon R11 or pentane. Freon R11 has a boiling point of 23.7 degrees Celsius and is suitable for extremely cold or hot-summer-cold-winter regions, while pentane has a boiling point of 36 degrees Celsius and has high latent heat and is suitable for extremely hot regions.

[0029] In this embodiment, the louvered plate 12 and the central tube 14 are preferably made of aluminum alloy, which has a high heat transfer coefficient and is lightweight, thus reducing their weight. The condenser tube 15 and the evaporator tube 2 are preferably made of copper. The corresponding condenser tube 15 and evaporator tube 2 are located in different areas of the same bent copper tube, which has a high heat transfer coefficient.

[0030] In this embodiment, the roof radiation layer covers the entire building roof, and the preferred width of a single double-sided louvered radiation unit 1 is 200~400mm. The advantage of this width range is that it can make full use of the space of the cavity 5 and facilitate rotation and adjustment.

[0031] In this embodiment, the tilt angle of the double-sided louvered radiating unit 1 is preferably 3°~5°.

[0032] Example 2 This embodiment provides a method for regulating heat collection and dissipation, based on the integrated heat collection and dissipation energy-saving enclosure structure in Embodiment 1 above.

[0033] When cooling is required during seasons with higher ambient temperatures, the heat dissipation surface 11 of the louvers 12 in the roof radiant layer should face upwards: During the day, the heat dissipation surface 11 reflects solar radiation heat away and cools it through long-wave radiation from the sky, dissipating heat to the outside and reducing the heat gain of the building roof due to solar radiation. In addition, the connecting device 6 isolates the interior from the cavity 5, forming an insulating air layer in the cavity 5 to insulate the interior. At the same time, as the temperature of the wall 3 rises, the evaporator 2 inside the wall 3 absorbs heat from the wall 3, and the internal heat-conducting medium A absorbs heat from the evaporator 2 and evaporates into the condenser 15. The heat of the heat-conducting medium A is transferred to the louvered plate 12 through the condenser 15 and the central pipe 14, and then discharged to the sky through the heat dissipation surface 11. After the heat-conducting medium A loses heat, it condenses and flows back to the evaporator 2 to achieve the circulation of heat dissipation in the wall 3. At night, the connecting device 6 circulates the air between the room and the cavity 5. The heat in the room is transferred to the cavity 5 through the air circulation, and the heat in the cavity 5 is transferred to the louvered plate 12 and discharged to the outside through the heat dissipation surface 11, realizing active heat dissipation in the room and reducing the indoor cooling load. At the same time, since there is still heat stored in the wall 3, the evaporator 2 in the wall 3 absorbs heat from the wall 3. The internal heat transfer medium A absorbs heat from the evaporator 2 and evaporates into the condenser 15. The heat of the heat transfer medium A is transferred to the louvered plate 12 through the condenser 15 and the central tube 14, and then discharged to the sky through the heat dissipation surface 11. After the heat transfer medium A loses heat, it condenses and flows back to the evaporator 2 to realize the circulating heat dissipation of the wall 3.

[0034] When heating is required during seasons with lower ambient temperatures, the heat-collecting surface 13 of the louvered panel 12 in the roof radiant layer should face upwards: During the day, the heat collection surface 13 absorbs solar radiation heat to heat the louvered plate 12, which in turn heats the cavity 5. Furthermore, the connecting device 6 allows air to circulate between the room and the cavity 5, and the heat from the cavity 5 is transferred to the room through the air circulation, thereby raising the indoor temperature and reducing the indoor heat load. At night, the connecting device 6 isolates the interior from the cavity 5, allowing the cavity 5 to form an insulating air layer to keep the interior warm and reduce building heat loss.

[0035] This application can fully utilize natural energy to meet heating and cooling needs in both summer and winter, reducing building heating and air conditioning energy consumption, achieving year-round reduction in building energy consumption, making full use of limited roof area, and reducing system complexity and cost. The roof radiant layer uses multiple modular, independent units, which can reduce the space required for rotation, make full use of the roof area, and reduce the space requirements of the roof. The heat exhaust surface 11 and the heat collection surface 13 are respectively located on both sides of the louvered plate 12. The working surface can be switched by flipping the louvered plate 12. Therefore, when cooling is needed in summer, the heat exhaust surface 11 can be turned upward to reduce indoor heat gain and reduce building cooling load. When heating is needed in winter, the heat collection surface 13 can be turned upward to raise indoor temperature and reduce building heat load. This can meet the cooling and heating needs of summer and winter respectively. The connecting device 6 can realize air circulation and isolation between the interior and the cavity 5. On the one hand, the cavity 5 provides a space for the louvered plate 12 to rotate. On the other hand, it can form a heat insulation air layer or heat preservation air layer in the isolation state, reducing the heat gain or heat loss caused by heat transfer from the roof of the building. In the air circulation state, the indoor air can directly contact the louvered plate 12 for heat exchange, realizing different functions such as active heat collection and heat dissipation in the interior, and improving the efficiency of natural energy utilization. Evaporator 2, condenser 15, and heat transfer medium A are high-efficiency heat transfer components that can transfer a large amount of heat under low temperature difference conditions. In summer, they can transfer the heat of the wall 3 to the louvered plate 12 and exhaust it to the sky through the heat dissipation surface 11, thus realizing the circulating heat dissipation of the wall 3. This solves the problem that traditional radiant cooling can only reduce the roof cooling load. It can also passively cool the exterior walls of the building, further reducing the indoor cooling load of the building.

[0036] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. An integrated heat collection and heat dissipation energy-saving enclosure structure, characterized in that: The system includes a roof subsystem and a wall subsystem. The roof subsystem includes an externally facing roof radiant layer, an internally facing roof structural layer, a cavity between the roof radiant layer and the roof structural layer, and a communication device for air circulation and isolation between the interior and the cavity. The roof radiant layer includes several inclined and side-by-side double-sided louvered radiant units. Each double-sided louvered radiant unit includes a fixed condenser tube, a central tube rotatably fitted onto the condenser tube, and louvers on both sides of the central tube. One side of the louver is a heat dissipation surface with a sky radiation cooling material, and the other side is a heat collection surface with a solar heat collection material. Flipping the louvers can switch the working surface of the louvers. Heat can be conducted sequentially between the louvers, the central tube, and the condenser tube. The wall subsystem includes an externally facing wall and evaporator tubes installed within the wall. The evaporator tubes are distributed along the wall and their upper ends are connected to the lower ends of the corresponding condenser tubes. The evaporator tubes are used to store a heat-conducting medium that can absorb heat and evaporate. The connecting device includes an air duct installed on the roof structure layer to connect the cavity and the room, an air valve installed on the air duct to control the opening and closing of the air duct, and a fan installed on the air duct to realize the air circulation between the cavity and the room. The central tube and the condenser tube are fitted with a bearing, and the space between them is filled with a lubricating oil with excellent thermal conductivity and the lubricating oil is prevented from leaking through an end seal; The louvers and central tube are made of aluminum alloy, while the condenser and evaporator tubes are made of copper. The corresponding condenser and evaporator tubes are located in different areas of the same bent copper tube. The tilt angle of the double-sided louvered radiating units is 3°~5°.

2. The integrated heat collection and heat dissipation energy-saving enclosure structure as described in claim 1, characterized in that: Sky radiation cooling material has high long-wave emissivity and solar radiation reflectivity, and is made by combining organic radiation cooling film with metallic silver.

3. The integrated heat collection and heat dissipation energy-saving enclosure structure as described in claim 1, characterized in that: The solar thermal collector material has a high solar radiation absorption rate and is made of black chromium oxide.

4. The integrated heat collection and heat dissipation energy-saving enclosure structure as described in claim 1, characterized in that: The heat transfer medium stored in the evaporator tube is either Freon R11 or pentane.

5. The integrated heat collection and heat dissipation energy-saving enclosure structure as described in claim 1, characterized in that: The roof radiation layer covers the entire roof surface of the building, and the width of a single double-sided louvered radiation unit is 200~400mm.

6. A method for regulating heat collection and dissipation, characterized in that: Based on the integrated energy-saving enclosure structure for heat collection and heat dissipation as described in any one of claims 1 to 5; When cooling is required during seasons with high ambient temperatures, the heat dissipation surface of the louvers in the roof radiant layer faces upwards. During the day, the heat dissipation surface reflects solar radiation and cools the building through long-wave radiation from the sky, reducing the heat loss from solar radiation on the roof. Furthermore, the connecting device isolates the interior from the cavity, creating an insulating air layer within the cavity for indoor insulation. Simultaneously, as the wall temperature rises, the evaporator pipes within the wall absorb heat from the wall, and the internal heat transfer medium absorbs heat from the evaporator pipes and evaporates into the condenser pipes. The heat from the heat transfer medium is transferred to the louvers through the condenser pipes and the central pipe, and then dissipated to the sky through the heat dissipation surface, resulting in heat loss from the heat transfer medium. The condenser then flows back to the evaporator to achieve circulating heat dissipation in the wall. At night, the connecting device circulates the air between the room and the cavity. The heat in the room is transferred to the cavity through the air circulation, and the heat in the cavity is transferred to the louvers and discharged to the outside through the heat dissipation surface, thus achieving active heat dissipation in the room and reducing the indoor cooling load. At the same time, since there is still heat stored in the wall, the evaporator in the wall absorbs heat from the wall, and the internal heat transfer medium absorbs heat from the evaporator and evaporates into the condenser. The heat of the heat transfer medium is transferred to the louvers through the condenser and the central tube, and then discharged to the sky through the heat dissipation surface. After the heat transfer medium loses heat, it condenses and flows back to the evaporator to achieve circulating heat dissipation in the wall. When heating is needed during seasons with lower ambient temperatures, the heat-collecting surfaces of the louvers in the roof radiant layer are positioned upwards: During the day, the heat-collecting surfaces absorb solar radiation to heat the louvers, which in turn heat the cavity. Furthermore, the connecting device allows air circulation between the interior and the cavity, transferring heat from the cavity to the interior through air circulation, thereby raising the indoor temperature and reducing the indoor heat load. At night, the connecting device isolates the interior from the cavity, creating an insulating air layer within the cavity to insulate the interior and reduce building heat loss.

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