An indoor VOCs elimination system using solar light and heat

Abstract

The present application discloses an indoor VOCs elimination system utilizing solar light and heat, comprising two light-transmitting plates arranged inside and outside the window, a plurality of rotating louvers arranged between the two light-transmitting plates, and a power storage component arranged on the indoor wall; the upper and lower ends of the light-transmitting plates arranged inside the window are respectively provided with an upper internal air outlet and a lower internal air outlet; the rotating louvers include selectively transparent glass, a photovoltaic film, a heat storage layer, and a photocatalytic film; the selectively transparent glass and the heat storage layer are respectively coated on both sides of the photovoltaic film; the photocatalytic film is coated on the side of the heat storage layer away from the photovoltaic film. The present application realizes the use of sunlight and heat pressure principles to circulate indoor air to the photocatalytic film for photocatalytic degradation. The air is fully in contact with the photocatalytic film during circulation, and the photocatalytic time is sufficient, reducing the possibility of incomplete reaction. At the same time, sunlight is used for photovoltaic power generation and heat storage, and the stored heat is further used for indoor heating. The overall system is energy-saving and environmentally friendly.

Description

Technical Field

[0001] The present application relates to the technical field of VOCs treatment, and in particular to an indoor VOCs elimination system utilizing solar light and heat. Background Art

[0002] Volatile organic compounds are often referred to as VOCs, which is the abbreviation of the first letters of the three words Volatile Organic Compounds. Total volatile organic compounds are referred to as TVOC.

[0003] According to the definition of the World Health Organization (WHO), VOCs are various organic compounds with a boiling point of 50°C to 260°C at room temperature. In my country, VOCs refer to organic compounds with a saturated vapor pressure greater than 70Pa at room temperature and a boiling point below 260°C at normal pressure, or all organic compounds with a vapor pressure greater than or equal to 10Pa and volatility at 20°C. VOCs participate in the formation of ozone and secondary aerosols in the atmospheric environment, and have an important impact on regional atmospheric ozone pollution and PM2.5 pollution. Most VOCs have a special unpleasant odor and are toxic, irritating, teratogenic and carcinogenic, especially benzene, toluene and formaldehyde, which can cause great harm to human health. VOCs are important precursors to urban haze and photochemical smog, and are mainly derived from coal chemical industry, petrochemical industry, fuel coating manufacturing, solvent manufacturing and use, and other processes. Outdoors, VOCs mainly come from industrial waste gas, automobile exhaust, photochemical pollution, etc. generated by fuel combustion and transportation; indoors, they mainly come from combustion products such as coal and natural gas, smoke from smoking, heating and cooking, emissions from building and decoration materials, furniture, household appliances, automobile interior parts production, cleaning agents, and human body. In the process of interior decoration, VOCs mainly come from paints, coatings and adhesives, and solvent-based release agents. The VOC content in general paints is 0.4-1.0 mg / m3. Due to the strong volatility of VOCs, under normal circumstances, 90% of the paint can be volatilized within 10 hours after the paint is applied, while the VOCs in the solvent only release 25% of the total amount during the air drying process of the paint.

[0004] Existing indoor VOCs photocatalytic treatment methods mainly rely on passing indoor air into a special VOCs photocatalytic processor. Common photocatalytic processors include flat plate, tubular, honeycomb, etc. These photocatalytic reactors have similar structures, that is, there is an ultraviolet light source, and then the photocatalyst is attached to the flat plate, the inner wall of the outer tube shell or the wall of the honeycomb hole. When the light source is turned on, a fan is used to send the extracted indoor air to the photocatalytic processor, and the VOCs in the air are catalytically degraded on the surface of the photocatalyst. This process not only requires a separate light source but also requires special extraction of indoor air into the processor, which results in poor energy saving. In addition, if the photocatalytic treatment time is insufficient or the reaction is not thorough due to insufficient contact, small molecular organic compounds will be produced. These small molecular organic compounds will come out of the reactor and enter the room, which will cause great harm to the human body. Summary of the invention

[0005] The present application provides an indoor VOCs elimination system using solar light and thermal energy, which solves the problem that in the prior art, when treating indoor VOCs, a single light source is used and indoor air needs to be specially extracted into the processor, resulting in poor energy-saving effect, and insufficient photocatalytic time and insufficient contact lead to incomplete reaction to produce small molecule organic compounds that harm the human body. The application realizes the use of sunlight and heat pressure principles to circulate indoor air to the photocatalytic film for photocatalytic degradation. During the circulation, the air is in sufficient contact with the photocatalytic film and the photocatalytic time is sufficient, reducing the possibility of incomplete reaction. At the same time, sunlight is used for photovoltaic power generation and heat storage, and the stored heat is further used for indoor heating. The overall system is energy-saving and environmentally friendly.

[0006] The present application provides an indoor VOCs elimination system using solar light and thermal energy, comprising two light-transmitting plates arranged on the inside and outside of a window, a plurality of rotating louvers arranged between the two light-transmitting plates, and a power storage component arranged on an indoor wall; the upper and lower ends of the light-transmitting plates arranged on the inside of the window are respectively provided with an upper internal air outlet and a lower internal air outlet; the upper and lower ends of the rotating louvers are rotatably connected to the window, and the rotating louvers include selectively transparent glass, a photovoltaic film, a heat storage layer and a photocatalytic film; the selectively transparent glass and the heat storage layer are respectively coated on both sides of the photovoltaic film; the photocatalytic film is coated on the side of the heat storage layer away from the photovoltaic film; the photovoltaic film is electrically connected to the power storage component and can store the generated electrical energy in the power storage component.

[0007] In a possible implementation, the side of the rotating louver facing away from the photocatalytic film is a concave surface structure.

[0008] In a possible implementation, the indoor VOCs elimination system using solar heat provided by the present application further includes a PLC controller, a lifting baffle, an axial fan, a VOCs concentration sensor, a pressure sensor and a temperature sensor; the upper and lower ends of the light-transmitting plate arranged outside the window are respectively provided with an upper external air outlet and a lower external air outlet; the upper and lower ends of the other three walls of the room except the wall where the window is located are provided with an upper air outlet and a lower air outlet; the PLC controller is arranged on the indoor wall and is electrically connected to the power storage component; The upper layer external air outlet, the lower layer external air outlet, the upper layer internal air outlet and the lower layer internal air outlet are all provided with the axial flow fan and the lifting baffle; the upper air outlet and the lower air outlet are both provided with the lifting baffle; the axial flow fan is electrically connected to the power storage component; the VOCs concentration sensor is arranged in the room, and the outer sides of the remaining three walls are respectively provided with the pressure sensor and the temperature sensor; the VOCs concentration sensor, the pressure sensor and the temperature sensor are all electrically connected to the PLC controller.

[0009] In a possible implementation, the heat storage layer includes a phase change material; the phase change material is coated on a side of the photovoltaic film facing away from the selective transmission glass.

[0010] In a possible implementation, the selective transmission glass can transmit sunlight with a wavelength higher than 380 nm and reflect sunlight with a wavelength lower than 380 nm.

[0011] In a possible implementation, the power storage component includes a photovoltaic controller, an inverter and a battery; the photovoltaic controller, the inverter and the battery are electrically connected to each other and are all arranged on the indoor wall; the battery is electrically connected to the photovoltaic film.

[0012] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0013] The present application adopts two light-transmitting plates arranged inside and outside the window, a plurality of rotating louvers arranged between the two light-transmitting plates, and a power storage component arranged on the indoor wall; further, upper and lower ends of the light-transmitting plates arranged inside the window are respectively provided with an upper internal air outlet and a lower internal air outlet. When the two light-transmitting plates are irradiated with sunlight for a long time, the air temperature in the cavity between the two light-transmitting plates increases. There is a density difference between the high-temperature air in the cavity and the low-temperature air in the room, which constitutes a heat pressure of air circulation. The indoor air circulates through the lower internal air outlet and the upper internal air outlet and passes through the cavity between the two light-transmitting plates. There is no need to extract the indoor air separately, thereby reducing energy consumption.

[0014] Then the upper and lower ends of the rotating louver are rotated and connected to the window, and the rotating louver is further arranged to include selectively transparent glass, photovoltaic film, heat storage layer and photocatalytic film; the selectively transparent glass and the heat storage layer are respectively coated on both sides of the photovoltaic film; the photocatalytic film is coated on the side of the heat storage layer away from the photovoltaic film; the photovoltaic film is electrically connected to the power storage component and can store the generated electrical energy in the power storage component; the selectively transparent glass can filter sunlight, and the sunlight that selectively transmits the glass is irradiated to the photovoltaic film to generate photovoltaic power, and the electrical energy is stored in the power storage component, which fails to By selecting the sunlight that passes through the glass to be reflected onto the photocatalytic film on the back of the adjacent rotating louvers, the air in the cavity between the two light-transmitting plates is photocatalytically degraded, and finally the VOCs in the room are photocatalytically degraded and eliminated; in addition, the sunlight that cannot be used by photovoltaic power generation heats the heat storage layer, and the heat storage layer stores the heat, which can increase the temperature of the air in the cavity between the two light-transmitting plates, providing power for the heat pressure cycle, and at the same time can provide heat to the air in the cavity between the two light-transmitting plates, thereby providing auxiliary heating for the room;

[0015] Since the power provided for indoor air circulation by the heat pressure principle is relatively small, the speed of indoor air circulation and passing through the cavity between the two light-transmitting plates is slow, so that the indoor air can fully contact the photocatalytic film and the photocatalytic degradation time is sufficient, reducing the probability of incomplete reaction. It is helpful to alleviate the technical problems that when treating indoor VOCs in the prior art, a separate light source is used and the indoor air needs to be specially extracted to the processor, resulting in poor energy saving effect, and a large flow rate will lead to insufficient photocatalytic time and insufficient contact, thereby causing incomplete reaction to produce small molecule organic compounds that are harmful to the human body. It realizes the use of sunlight and heat pressure principles to circulate indoor air to the photocatalytic film for photocatalytic degradation. When the air circulates, it fully contacts the photocatalytic film and the photocatalytic time is sufficient, reducing the possibility of incomplete reaction. At the same time, sunlight is used for photovoltaic power generation and heat storage, and the stored heat is further used for indoor heating. The overall system is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A front view of a rotating louver provided in an embodiment of the present application when it is arranged on a window;

[0018] Figure 2 for Figure 1 Side view after adding light-transmitting plate, PLC controller, lifting baffle and axial flow fan;

[0019] Figure 3 A schematic diagram of the side structure of the rotating louver provided in an embodiment of the present application;

[0020] Figure 4 for Figure 3 Cross-sectional view in CC direction;

[0021] Figure 5 This is a top view of the rotating louvers when sunlight shines on them in the morning;

[0022] Figure 6 This is a top view of the rotating louvers when sunlight shines on them at noon;

[0023] Figure 7 This is a top view of the rotating louvers when sunlight shines on them in the afternoon;

[0024] Figure 8 It is a schematic diagram of the structure when sunlight irradiates the rotating louvers according to the embodiment of the present application and fails to be aggregated by the sunlight selectively transmitted through the glass and is reflected to the back of the adjacent rotating louvers;

[0025] Fig. 9 A ventilation principle diagram of auxiliary ventilation strategy 1 provided in an embodiment of the present application;

[0026] Fig.10 A ventilation principle diagram of auxiliary ventilation strategy 2 provided in an embodiment of the present application;

[0027] Fig.11 A ventilation principle diagram of auxiliary ventilation strategy three provided in an embodiment of the present application;

[0028] Fig.12 Schematic diagram of the PLC controller controlling the air outlet and axial flow fan provided in the embodiment of the present application.

[0029] Figure markings: 1-light-transmitting plate; 11-upper layer internal air outlet; 12-lower layer internal air outlet; 13-upper layer external air outlet; 14-lower layer external air outlet; 15-upper air outlet; 16-lower air outlet; 2-rotating louvers; 21-selective transmission glass; 22-photovoltaic film; 23-heat storage layer; 231-phase change material; 24-photocatalytic film; 3-power storage component; 31-photovoltaic controller; 32-inverter; 33-battery; 4-PLC controller; 5-lifting baffle; 6-axial flow fan; 7-cavity; 8-window. DETAILED DESCRIPTION

[0030] 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 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.

[0031] In the description of the embodiments of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0032] Reference Figure 1-3An indoor VOCs elimination system using solar thermal energy is provided in an embodiment of the present application, comprising two light-transmitting plates 1 arranged inside and outside a window 8, a plurality of rotating louvers 2 arranged between the two light-transmitting plates 1, and a power storage component 3 arranged on an indoor wall; the light-transmitting plate 1 arranged inside the window 8 is provided with an upper internal air outlet 11 and a lower internal air outlet 12 at the upper and lower ends thereof respectively; the upper and lower ends of the rotating louvers 2 are rotatably connected to the window 8, and the rotating louvers 2 comprise selectively transparent glass 21, a photovoltaic film 22, a heat storage layer 23 and a photocatalytic film 24; the selectively transparent glass 21 and the heat storage layer 23 are respectively coated on both sides of the photovoltaic film 22; the photocatalytic film 24 is coated on the side of the heat storage layer 23 away from the photovoltaic film 22; the photovoltaic film 22 is electrically connected to the power storage component 3, and can store the generated electrical energy in the power storage component 3. In the embodiment of the present application, the window 8 is set on the south wall of the house, the light-transmitting plate 1 is a light-transmitting glass plate, and the photocatalytic film 24 is a titanium dioxide film. In the embodiment of the present application, the rotating louver 2 is in an open state under normal conditions, because it is necessary to irradiate light into the house. At this time, the rotating louver 2 has the same function as the ordinary louver, except that it does not block light. When the external light is strong and the rotating louver 2 is required to block part of the sunlight, each rotating louver 2 is rotated so that the backs of adjacent rotating louvers 2 are parallel to each other. By rotating the rotating louvers, not only can part of the sunlight be blocked, but photocatalytic degradation can also be performed. That is, when sunlight irradiates the selectively transmitted glass 21, the sunlight that fails to pass through the selectively transmitted glass 21 can be reflected on the photocatalytic film 24 on the back of the adjacent rotating louver 2, so that photocatalytic degradation can be performed. In the embodiment of the present application, when sunlight irradiates the two light-transmitting plates 1 for a long time, the air in the cavity 7 between the two light-transmitting plates 1 and the heat storage layer 23 will be heated and heated (the heat storage layer 23 can The heat that cannot be used for photovoltaic power generation is absorbed by the sunlight that is selectively irradiated on the photovoltaic film through the glass 21). There is a density difference between the high-temperature air in the cavity 7 and the low-temperature air in the room, which constitutes the heat pressure of the air circulation, so that the indoor air circulates through the lower internal air outlet 12 and the upper internal air outlet 11 and passes through the cavity 7 between the two light-transmitting plates 1. Due to the setting of selectively passing through the glass 21, the sunlight that cannot be selectively passed through the glass 21 is reflected to the photocatalytic film 24 on the back of the adjacent rotating louver 2, so that the indoor VOCs circulated in the cavity 7 can be photocatalytically degraded and eliminated. By selectively passing through the glass 21, the sunlight is irradiated on the photovoltaic film 22 to perform photovoltaic power generation, and the generated electrical energy is stored in the power storage component 3. Due to the low conversion efficiency of photovoltaic power generation, about 80% of the sunlight is converted into heat on the photovoltaic film 22, and the heat is stored in the heat storage layer 23. The air circulated in the cavity 7 exchanges heat with the heat storage layer 23, which can provide auxiliary heating for the room.

[0033] Reference Figure 5-7In the embodiment of the present application, it is further taken into consideration that the angle of sunlight changes gradually from morning to afternoon. Therefore, when it is necessary to block sunlight from morning to afternoon, the rotation state of the rotating louver 2 in the embodiment of the present application needs to change synchronously with the change in the angle of sunlight, so as to better adapt to the sunlight irradiating to the selectively transmitted glass 21. The sunlight that fails to pass through the selectively transmitted glass 21 can be reflected to the photocatalytic film 24 on the back of the adjacent rotating louver 2, so that photocatalytic degradation can be carried out.

[0034] Reference Figure 3-8 , the side of the rotating louver 2 away from the photocatalytic film 24 is an inner concave surface structure. In the embodiment of the present application, the side of the rotating louver 2 away from the photocatalytic film 24 is further set to an inner concave surface structure, that is, the whole after the selective transmission glass 21 and the solar photovoltaic film 22 are combined is provided with an inner concave surface. The purpose of such setting is twofold. One is to increase the area of ​​the photovoltaic film 22 and enhance the area of ​​photovoltaic power generation; the other is to make the sunlight that fails to pass through the selective transmission glass 21 aggregate and reflect to the photocatalytic film 24 on the back of the adjacent rotating louver 2, so that the light intensity is stronger, more sunlight can be used for photocatalytic degradation, and the sufficiency of photocatalytic degradation is further improved.

[0035] Reference Figure 2 , 12The embodiment of the present application provides an indoor VOCs elimination system using solar heat, which also includes a PLC controller 4, a lifting baffle 5, an axial flow fan 6, a VOCs concentration sensor, a pressure sensor and a temperature sensor; the upper and lower ends of the light-transmitting plate 1 arranged outside the window 8 are respectively provided with an upper external air outlet 13 and a lower external air outlet 14; the upper and lower ends of the other three walls of the room except the wall where the window 8 is located are provided with an upper air outlet 15 and a lower air outlet 16; the PLC controller 4 is arranged on the indoor wall and is connected to the battery Component 3 is electrically connected; the upper external air outlet 13, the lower external air outlet 14, the upper internal air outlet 11 and the lower internal air outlet 12 are all provided with axial flow fans 6 and lifting baffles 5; the upper air outlet 15 and the lower air outlet 16 are both provided with lifting baffles 5; the axial flow fan 6 is electrically connected to the power storage component 3; the VOCs concentration sensor is arranged indoors, and the outer sides of the other three walls are respectively provided with pressure sensors and temperature sensors; the VOCs concentration sensor, pressure sensor and temperature sensor are all electrically connected to the PLC controller 4. In the embodiment of the present application, it is further considered that if the indoor VOCs concentration is high (higher than the threshold value) and photocatalytic degradation alone cannot meet the requirements, auxiliary measures are taken to reduce the indoor VOCs concentration, that is, a PLC controller 4, a lifting baffle 5, an axial flow fan 6, a VOCs concentration sensor, a pressure sensor and a temperature sensor are further used; in order to prevent the outdoor cold wind from blowing directly into the room when the vents are opened in winter, the PLC controller 4 will select the wall with the minimum pressure to open the vent in winter according to the static pressure converted from the dynamic pressure of the wind blowing on the wall measured by the pressure sensors on the outside of the other three walls; in summer, in order to use the low-temperature air on the shady side of the building to cool the indoor The interior is cooled down, and in summer, the lowest temperature is selected to open the air vents according to the air temperature outside the wall measured by the temperature sensors on the outside of the other three walls, so as to reduce the indoor VOCs concentration to the threshold range through ventilation; in the embodiment of the present application, a lifting baffle 5 is arranged to close and open the upper external air vent 13, the lower external air vent 14, the upper internal air vent 11, the lower internal air vent 12, the upper air vent 15 and the lower air vent 16 according to actual needs, and the opening method can be manual opening or automatic opening by the PLC controller 4. If it is necessary to automatically control the opening of the lifting baffle 5 by the PLC controller 4, it is also necessary to electrically connect the lifting baffle 5 to the PLC controller 4 and the power storage component 3 respectively.

[0036] Reference Figure 3 The heat storage layer 23 includes a phase change material 231; the phase change material 231 is coated on the side of the photovoltaic film 22 away from the selective transmission glass 21. In the embodiment of the present application, the phase change material 231 is a composite paraffin, which is a mixture of eicosane with a phase change temperature of 36°C and aluminum metal powder. The composite paraffin helps to stabilize the temperature of the solar photovoltaic film 22 at 36°C, and the aluminum powder can play a role in enhancing heat exchange.

[0037] Reference Figure 3-7 The selective transmission glass 21 can transmit sunlight with a wavelength higher than 380nm and reflect sunlight with a wavelength lower than 380nm. In the embodiment of the present application, the selective transmission glass 21 is provided so that sunlight with a wavelength higher than 380nm passes through the selective transmission glass 21 and shines on the photovoltaic film 22 for photovoltaic power generation, and sunlight with a wavelength lower than 380nm is reflected to the photocatalytic film 24 on the back of the adjacent rotating louver 2. When the photocatalytic film 24 is irradiated by sunlight with a wavelength lower than 380nm, it catalyzes and degrades indoor VOCs circulating in the cavity 7 between the two light-transmitting plates 1.

[0038] Reference Figure 2 , 12 The power storage component 3 includes a photovoltaic controller 31, an inverter 32 and a battery 33; the photovoltaic controller 31, the inverter 32 and the battery 33 are electrically connected and are all arranged on the indoor wall; the battery 33 is electrically connected to the photovoltaic film 22. In the embodiment of the present application, the electric energy generated by the photovoltaic film 22 is stored in the battery 33. When it is needed, the battery 33 releases the electric energy and outputs it through the inverter 32 for use by the axial flow fan 6 or the lifting baffle 5.

[0039] The specific working principle of the indoor VOCs elimination system using solar light and heat provided in the embodiment of the present application is as follows:

[0040] In winter, the upper internal vents 11 and the lower internal vents 12 are opened, and the lower external vents 14 and the upper external vents 13 are closed. After sunlight hits the selective transmission glass 21, sunlight with a wavelength higher than 380nm passes through the selective transmission glass 21 and shines on the photovoltaic film 22 for photovoltaic power generation. A large amount of heat is generated while photovoltaic power generation. Long-term exposure causes the air temperature in the cavity 7 between the phase change material 231 and the two light-transmitting plates 1 to increase. There is a density difference between the high-temperature air in the cavity 7 and the low-temperature air in the room, which constitutes a thermal pressure for air circulation, providing power for the indoor air to circulate through the cavity 7 between the two light-transmitting plates 1. The passing air exchanges heat with the high-temperature phase change material 231 on the rotating louver 2, which not only provides auxiliary heating for the room, but also reduces its temperature through convective heat exchange between the air and the photovoltaic film, which helps the photovoltaic film to be in a high-efficiency state. In addition, sunlight with a wavelength below 380nm is reflected to the photocatalytic film 24 on the back of the adjacent rotating louvers 2. When the air passes through the cavity 7 between the two light-transmitting plates 1, the air contacts the photocatalytic film 24, and the VOCs in the air are photocatalytically degraded under the irradiation of sunlight with a wavelength below 380nm, thereby reducing the concentration of VOCs in the room.

[0041] Reference Fig. 9At the same time, the indoor VOCs concentration sensor will measure the indoor VOCs concentration at intervals. When the concentration is higher than the threshold, the PLC controller 4 will not take action immediately, but will determine the changing trend of the indoor VOCs concentration through a period of detection. If it is an increasing trend, the PLC controller 4 will adopt auxiliary ventilation strategy 1. Because each region will have cold winds from different directions in winter, this will form positive pressure on the windward side of the building wall, making it difficult to exhaust air from the air vent and causing cold air to penetrate from the air vent. Therefore, auxiliary ventilation strategy 1 is based on the pressure values ​​measured by the outer pressure sensors of the other three walls except the south wall (the wall where the window 8 is located) in the room, selects the wall with the lowest pressure and opens its lower air vent 16, and at the same time opens the lower external air vent 14 and the upper internal air vent 11. At this time, the outside fresh air enters the air space between the two light-transmitting panels 1 through the lower external air vent 14. Cavity 7, in contact with the high-temperature phase change material 231, absorbs the heat emitted by the solar photovoltaic film 22 while being preheated, and is discharged from the cavity 7 through the upper internal air vent 11 and enters the room. In winter, the outdoor air is preheated through the cavity 7, the temperature rises, and the density decreases. When entering the room through the upper internal air vent, it will gradually accumulate at the upper part, squeezing the lower air to be discharged from the downwind vent 16, and finally discharged to the outdoors from the downwind vent 16 of the wall with the lowest pressure under the action of the indoor and outdoor pressure difference, and the indoor VOCs are ventilated and diluted to finally be reduced to below the threshold; when the VOCs concentration is reduced to below the threshold, the downwind vent 16 is closed, and the axial flow fans 6 of the lower external air vent 14 and the upper internal air vent 11 are kept in the open state, and the air is forced into the room through mechanical ventilation to create a positive pressure environment for the room, which can prevent cold wind from penetrating and create a pressure difference between indoor and outdoor to facilitate the next exhaust. Since the air heated by the cavity 7 moves toward the lower air outlet 16 in the auxiliary ventilation strategy 1 against the thermal pressure gradient, the auxiliary ventilation strategy 1 temporarily needs to open the axial flow fan 6 of the lower external air outlet 14 and the upper internal air outlet 11 to increase the ventilation volume by increasing mechanical ventilation to meet the indoor VOCs concentration reduction as soon as possible.

[0042] Reference Fig.10In summer, the upper internal vents 11 and the lower internal vents 12 are opened, and the indoor air circulates through the cavity 7 between the two light-transmitting plates 1 under the action of heat pressure, catalytically degrading the VOCs in the indoor air. However, while the air circulates, it also convects heat with the phase change material 231, bringing heat into the room, and the indoor temperature will be higher than the set range. Due to the building's shielding of sunlight, there will always be a wall that receives the least sunlight and the lowest temperature at different times. At this time, the PLC controller 4 will adopt auxiliary ventilation strategy 2, that is, the upper vents 15 and lower vents 16 of the wall with the lowest temperature sensed by the temperature sensors on the outside of the other three walls are all opened. The lower temperature outdoor air and the higher temperature outdoor air form a density difference to form heat pressure, which is conducive to natural ventilation indoors and outdoors. However, since this ventilation strategy uses natural ventilation, the low-temperature outdoor air only acts within a certain distance from the wall where the air outlet is opened, and cannot act on the entire room. Therefore, there may be a situation where the VOCs concentration in some areas is higher than the threshold value (because if the room is divided into area A and area B at this time, the temperature of the indoor air in area A is lower than the temperature of the air in cavity 7. Therefore, through the effect of thermal pressure, the air in area A and the air in cavity 7 undergo a local thermal pressure cycle. Similarly, the temperature of the indoor air in area B is higher than the temperature of the outdoor air. Therefore, the air in area B and the outdoor air undergo a local thermal pressure cycle through the upper air outlet 15 and the lower air outlet 16. Therefore, the VOCs concentration of the air at the junction of area A and area B may be higher than the threshold value).

[0043] Reference Fig.11 When the VOCs concentration in a local area of ​​the room is higher than the threshold in the auxiliary ventilation strategy 2, the PLC controller 4 will adopt the auxiliary ventilation strategy 3. The PLC controller 4 will select the wall with the lowest temperature according to the temperature sensors on the outside of the other three walls to open its upper air vent 15, and at the same time open the upper external air vent 13 and the lower internal air vent 12. The air with lower outside temperature enters the room through the upper air vent 15, passes through the indoor working area to the lower internal air vent 12, enters the cavity 7 under the action of thermal pressure, and moves toward the upper external air vent 13, and on the way, it will be exposed to the solar light. The photovoltaic film 22 and the high-temperature phase change material 231 are cooled to improve the power generation efficiency of the solar photovoltaic film 22, while preventing the solar radiation absorbed by the phase change material 231 from entering the room, maintaining the low temperature in the room while ventilating and diluting the indoor VOCs; when passing through the indoor working area, not only the indoor VOCs concentration is diluted, but also the outside backlight air ventilation is used as a natural cold source to cool the room; in order to accelerate the reduction of the indoor VOCs concentration to below the threshold, the axial flow fan 6 of the upper external air outlet 13 and the lower internal air outlet 12 is opened to increase the ventilation pressure.

[0044] Reference Fig. 9 , 11In the embodiment of the present application, the main purpose of adopting the auxiliary ventilation strategy of opening the downwind vent 16 in winter and the auxiliary ventilation strategy of opening the upwind vent 15 in summer is to expand the range of the airflow through the working area, maximize the path of the outside air through the indoor working area, and increase the ventilation effect. In addition, in winter, the auxiliary ventilation strategy of opening the downwind vent 16, the lower layer external vent 14 and the upper layer internal vent 11 allows the low-temperature outside air to first pass through the cavity 7, be slightly preheated, and then enter the indoor working area, and finally be discharged from the downwind vent 16. The slightly preheated outside air enters the room without causing the indoor temperature to drop to a very low level instantly, and minimizes the indoor heat loss while diluting the indoor VOCs concentration; in summer, the auxiliary ventilation strategy of opening the upwind vent 15, the lower layer internal vent 12 and the upper layer external vent 13 allows the outdoor back The natural cold air from the light enters the indoor working area, then enters the cavity 7 from the lower internal air outlet 12 and is finally discharged from the upper external air outlet 13, so that the range of the indoor working area through which the external natural cold air passes is maximized, while diluting the concentration of indoor VOCs and maximizing the indoor heat loss. At the same time, the external natural cold air entering the cavity 7 can cool the photovoltaic film 22 and the phase change material 231, thereby improving the power generation efficiency of the solar photovoltaic film 22, and at the same time preventing the solar radiation absorbed by the phase change material 231 from entering the room, further maintaining the low temperature in the room.

[0045] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0046] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. An indoor VOCs elimination system using solar light and heat, characterized in that: It comprises two light-transmitting plates (1) arranged inside and outside a window (8), a plurality of rotating louvers (2) arranged between the two light-transmitting plates (1), and a power storage component (3) arranged on an indoor wall; The upper and lower ends of the light-transmitting plate (1) disposed inside the window (8) are respectively provided with an upper internal air outlet (11) and a lower internal air outlet (12); The upper and lower ends of the rotating louver (2) are rotatably connected to the window (8), and the rotating louver (2) comprises selectively permeable glass (21), a photovoltaic film (22), a heat storage layer (23) and a photocatalytic film (24); The selectively permeable glass (21) and the heat storage layer (23) are respectively coated on both sides of the photovoltaic film (22); The photocatalytic film (24) is coated on the side of the heat storage layer (23) facing away from the photovoltaic film (22); The photovoltaic film (22) is electrically connected to the power storage component (3), and is capable of storing the generated electrical energy in the power storage component (3); It also includes a PLC controller (4), a lifting baffle (5), an axial flow fan (6), a VOCs concentration sensor, a pressure sensor and a temperature sensor; The upper and lower ends of the light-transmitting plate (1) disposed outside the window (8) are respectively provided with an upper external air outlet (13) and a lower external air outlet (14); The upper and lower ends of the other three walls of the room except the wall where the window (8) is located are provided with upper air vents (15) and lower air vents (16); The PLC controller is arranged on the indoor wall and is electrically connected to the power storage component (3); The upper layer external air outlet (13), the lower layer external air outlet (14), the upper layer internal air outlet (11) and the lower layer internal air outlet (12) are all provided with the axial flow fan (6) and the lifting baffle (5); The upper air outlet (15) and the lower air outlet (16) are both provided with the lifting baffle (5); The axial flow fan (6) is electrically connected to the power storage component (3); The VOCs concentration sensor is arranged in the room, and the pressure sensor and the temperature sensor are arranged on the outer sides of the other three walls respectively; The VOCs concentration sensor, the pressure sensor and the temperature sensor are all electrically connected to the PLC controller.

2. The indoor VOCs elimination system using solar light and heat according to claim 1 is characterized in that: The side surface of the rotating louver blade (2) facing away from the photocatalytic film (24) is an inner concave surface structure.

3. The indoor VOCs elimination system using solar light and heat according to claim 1 is characterized in that: The heat storage layer (23) comprises a phase change material (231); The phase change material (231) is coated on the side of the photovoltaic film (22) facing away from the selective transmission glass (21).

4. The indoor VOCs elimination system using solar light and heat according to claim 1 is characterized in that: The selective transmission glass (21) is capable of transmitting sunlight with a wavelength higher than 380 nm and reflecting sunlight with a wavelength lower than 380 nm.

5. The indoor VOCs elimination system using solar light and heat according to claim 1 is characterized in that: The power storage component (3) comprises a photovoltaic controller (31), an inverter (32) and a storage battery (33); The photovoltaic controller (31), the inverter (32) and the storage battery (33) are electrically connected to each other and are all arranged on the indoor wall; The storage battery (33) is electrically connected to the photovoltaic film (22).

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