Evaporative cooling roof system and its self-watering device

Abstract

The present invention provides an evaporative cooling roof system and a self-watering device thereof, the self-watering device comprising: a transparent cover body provided with corresponding air inlets and air outlets; a first fan for driving airflow from the air inlet into the transparent cover body and discharged from the air outlet, an airflow zone being formed between the air inlet and the air outlet; an adsorbent assembly comprising an adsorbent for absorbing moisture in the air; a moving mechanism arranged in the transparent cover body, and the adsorbent assembly being arranged on the moving mechanism; a condensation component connected to the transparent cover body, and the condensation component is a heat-conducting material, and the condensation component is provided with a drain outlet; a shading component for blocking sunlight, and the condensation component is located in a shadow zone formed by the shading component; and a cold air system for providing cold air blowing toward the condensation component. The evaporative cooling roof system and the self-watering device thereof provided by the present invention can solve the problem that the development of evaporative roof technology in water-scarce areas is limited due to water shortage.

Description

Technical Field

[0001] The invention relates to the technical field of evaporative cooling roofing, and in particular to an evaporative cooling roofing system and a self-watering device thereof. Background Art

[0002] Studies have shown that 50% of the heat gain in a single-story building comes from the roof. Therefore, applying passive evaporative cooling technology to the roof is an effective way to reduce the building's heat load, reduce air conditioning energy consumption, and improve the indoor thermal environment.

[0003] According to the classification of evaporation media, evaporative roof technologies include planted roofs, water storage roofs, sprinkler roofs, and wet porous media roofs. Traditional evaporative roof water replenishment methods are mainly rainwater collection and artificial water replenishment. In seasons or areas with more rain, rainwater can generally be relied on to meet evaporation needs. However, in water-scarce areas with little precipitation and water shortage, continuous water replenishment is required, and a large amount of domestic water is needed for replenishment, which restricts the development of evaporative roofs in water-scarce areas.

[0004] Therefore, how to solve the problem in the prior art that the development of evaporative roof technology in water-scarce areas is limited due to water shortage has become an important technical problem that technicians in this field need to solve. Summary of the invention

[0005] The present invention provides an evaporative cooling roof system and a self-watering device thereof, which can solve the problem that the development of evaporative roof technology in water-scarce areas is limited due to water shortage.

[0006] A first aspect of the present invention provides a self-watering device for an evaporative cooling roof system, comprising:

[0007] The transparent cover is provided with corresponding air inlets and air outlets, and an air flow area is formed between the air inlets and the air outlets;

[0008] A first fan, used for driving airflow to enter the transparent cover through the air inlet and be discharged through the air outlet;

[0009] an adsorbent assembly including an adsorbent for absorbing moisture from air;

[0010] A moving mechanism is arranged in the transparent cover, and the adsorbent assembly is arranged on the moving mechanism, and the moving mechanism can drive the adsorbent assembly to switch between the airflow area and the illumination area outside the airflow area;

[0011] A water condensation component is connected to the transparent cover body, and the water condensation component is a heat conductive material and is provided with a drain port;

[0012] A shading component is used to block sunlight, and the water condensation component is located in a shadow area formed by the shading component;

[0013] The cold air system provides cold air that blows toward the water condensation component to cool the water condensation component.

[0014] According to the self-watering device of the evaporative cooling roof system provided by the present invention, the cold air system includes an air duct and a second fan, the air duct passes through the evaporative cooling medium on the roof, and the second fan is used to drive the outside air to pass through the air duct and blow toward the water condensation component.

[0015] According to the self-watering device of the evaporative cooling roof system provided by the present invention, a heat sink is arranged on the outer side of the water condensation component, and a hydrophobic coating is arranged on the inner surface of the water condensation component.

[0016] According to the self-watering device of the evaporative cooling roof system provided by the present invention, the moving mechanism comprises:

[0017] A rotating bracket is rotatably disposed in the transparent cover, and the adsorbent assembly is multiple and distributed on the rotating bracket along the rotation direction of the rotating bracket;

[0018] The motor is connected to the rotating bracket to drive the rotating bracket to rotate.

[0019] According to the self-watering device of the evaporative cooling roof system provided by the present invention, the lower end of the transparent cover is provided with an opening, the water condensation component is a conical structure, and the cross-section of the conical structure gradually decreases from top to bottom, the upper end of the water condensation component is provided with an opening, and the opening of the water condensation component is connected to the opening of the transparent cover.

[0020] According to the self-watering device of the evaporative cooling roof system provided by the present invention, the shading component is a shading plate arranged around the transparent cover body, and the upper surface of the shading plate is a reflective surface.

[0021] According to the self-watering device of the evaporative cooling roof system provided by the present invention, the adsorbent assembly also includes an adsorbent container, an end of the adsorbent container is provided with an opening, the adsorbent is filled in the opening, and the wall material of the adsorbent container is an insulating material.

[0022] According to the self-watering device of the evaporative cooling roof system provided by the present invention, a hydrophobic filter membrane is arranged on the surface of the adsorbent; a porous heat-conducting material is arranged in the adsorbent container, and the adsorbent is filled in the porous heat-conducting material.

[0023] The self-watering device of the evaporative cooling roof system provided by the present invention further includes a solar power generation device, which is used to supply electric energy to the first fan, the second fan and the motor.

[0024] A second aspect of the present invention provides an evaporative cooling roof system, comprising an evaporative cooling medium arranged on the roof and a self-watering device for the evaporative cooling roof system as described in any one of the above items, wherein the drainage outlet of the condensation component corresponds to the evaporative cooling medium.

[0025] The self-watering device of the evaporative cooling roof system provided by the present invention comprises a transparent cover, a first fan, a shading component, an adsorbent assembly, a moving mechanism, a condensation component, and a cold air system, wherein the transparent cover is made of a transparent material, and sunlight can be irradiated into the interior of the transparent cover. The transparent cover is provided with an air inlet and an air outlet correspondingly arranged. Under the action of the first fan, the outside air enters the interior of the transparent cover from the air inlet and is discharged from the air outlet, and an air flow area, i.e., an air flow area, is formed between the air inlet and the air outlet. The shading component is used to block the sunlight, and the condensation component is located in the shadow area formed by the shading component. The adsorbent assembly includes an adsorbent for absorbing moisture in the air, and after the adsorbent absorbs moisture, the moisture in the adsorbent can form water vapor for dehydration under the action of sunlight. The moving mechanism is arranged in the transparent cover, and the adsorbent assembly is arranged on the moving mechanism, and the moving mechanism can drive the adsorbent assembly to switch between the above-mentioned air flow area and the illumination area outside the air flow area. When the adsorbent assembly is located in the airflow area, the adsorbent can absorb moisture in the air. When it moves out of the airflow area and is located in the illumination area, the moisture in the adsorbent can evaporate and dehydrate. The condensation component is connected to the transparent cover body, and the condensation component is a heat-conducting material, and the condensation component is provided with a drain port; the cold air provided by the cold air system blows toward the condensation component, which can cool the condensation component.

[0026] With such arrangement, the self-watering device provided by the present invention allows outside air to enter through the air inlet of the transparent cover and be discharged through the air outlet. When the airflow flows through the inside of the transparent cover, the moisture in the air can be adsorbed by the adsorbent in the airflow area. As the moving mechanism moves, the adsorbent is driven to the illuminated area outside the airflow area. Under the irradiation of sunlight, the moisture in the adsorbent evaporates. Since the condensation component is made of heat-conducting material, the cold air system can cool the condensation component, and the condensation component is located in the shadow area formed by the shading component, which can prevent the condensation component from being heated by sunlight. When the water vapor in the air encounters the condensation component with a lower temperature, it will condense into water in the condensation component and be discharged from the drain outlet of the condensation component. When using the self-watering device provided by the present invention, the drain outlet of the condensation component can be aligned with the evaporative cooling medium of the roof, so that the water discharged from the drain outlet falls on the evaporative cooling medium, thereby forming a cooling effect on the roof.

[0027] In summary, the self-watering device provided by the present invention can draw water from the air to provide a water source for evaporative cooling of the roof even in areas with less water resources, thereby achieving energy-saving and water-saving effects.

[0028] In a further solution, the cold air system includes an air duct and a second fan, the air duct passes through the evaporative cooling medium on the roof, and the second fan is used to drive the outside air through the air duct and blow toward the condensation component. It should be noted that when the water in the evaporative cooling medium evaporates, the heat of the surrounding air can be reduced. The present invention provides a second fan and an air duct, and the air duct passes through the evaporative cooling medium. Therefore, the temperature of the air blown toward the condensation component by the second fan is relatively low, and then the evaporative medium on the surface of the evaporative cooling roof is used to cool the cold source of the condensation component, thereby further achieving the effect of energy saving.

[0029] In a further technical solution, the moving mechanism includes a rotating bracket and a motor, the rotating bracket is rotatably arranged in the transparent cover, there are multiple adsorbent assemblies, and they are distributed on the rotating bracket along the rotation direction of the rotating bracket. The motor is transmission-connected to the rotating bracket to drive the rotating bracket to rotate.

[0030] With such an arrangement, the motor can drive the rotating bracket to rotate regularly, and the multiple adsorbent components distributed around the rotating bracket can continuously draw water and dehydrate, and the drawing and dehydration are carried out simultaneously, thereby continuously supplying water to the evaporative cooling medium on the evaporative roof.

[0031] The evaporative cooling roof system provided by the present invention comprises an evaporative cooling medium arranged on the roof and a self-watering device of the evaporative cooling roof system as described in any one of the above items, and the drainage port of the condensation component corresponds to the evaporative cooling medium.

[0032] In this way, the evaporative cooling roof system provided by the present invention can solve the problem that the development of evaporative roof technology in water-scarce areas is limited due to water shortage. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effect brought about by the above-mentioned self-watering device, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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.

[0034] Figure 1 It is a schematic diagram of the self-watering device provided by the present invention;

[0035] Figure 2 is a cross-sectional schematic diagram of an adsorbent assembly provided by the present invention;

[0036] Reference numerals:

[0037] 1: Transparent cover; 2: Adsorbent assembly; 3: Rotating bracket;

[0038] 4: shading component; 5: air inlet; 6: first fan;

[0039] 7: Exhaust vent; 8: Condensation component; 9: Hydrophobic coating;

[0040] 10: heat sink; 11: second fan; 12: thermal insulation layer;

[0041] 13: Drain valve; 14: Drain outlet; 15: Air duct;

[0042] 16: Evaporative cooling medium; 17: Temperature and humidity sensor; 18: Adsorbent;

[0043] 19: hydrophobic filter membrane; 20: porous thermal conductive material; 21: adsorbent container;

[0044] 22: Speed ​​control device. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings 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.

[0046] Combine the following Figure 1-Figure 2 And each embodiment describes in detail the evaporative cooling roof system and the self-watering device thereof provided by the present invention.

[0047] In some embodiments, the self-watering device of the evaporative cooling roof system includes a transparent cover 1, a first fan 6, a shading component 4, an adsorbent assembly 2, a moving mechanism, a condensation component 8 and a cold air system.

[0048] The transparent cover 1 is made of a transparent material, for example, it can be transparent glass, transparent resin material, etc. The shape of the transparent cover 1 can be hemispherical. Of course, in other embodiments, the transparent cover 1 can also be other shapes, such as a rectangular structure, a cylindrical structure, etc. The interior of the transparent cover 1 is a cavity, and the sunlight can pass through the transparent cover 1 to irradiate the interior of the transparent cover 1. An air inlet 5 and an air outlet 7 can be correspondingly arranged on opposite sides of the transparent cover 1, and the outside air enters the transparent cover 1 through the air inlet 5 and is discharged through the air outlet 7. Specifically, a first fan 6 can be arranged at the air inlet 5 or the air outlet 7. The direction of the airflow driven by the first fan 6 is consistent with the direction from the air inlet 5 to the air outlet 7. After the outside air enters the transparent cover 1 from the air inlet 5 and is discharged from the air outlet 7, an airflow zone is formed between the air inlet 5 and the air outlet 7, and under the driving action of the first fan 6, the outside air continuously flows through the airflow zone, and the area outside the airflow zone in the transparent cover 1 is less disturbed by the airflow.

[0049] The adsorbent component 2 includes an adsorbent 18 for absorbing moisture in the air, wherein the adsorbent 18 can be a material such as MOF (metal-organic framework material), silica gel, etc. Specifically, MOF-801, MOF-303 and other materials with strong water absorption can be used in low humidity areas, and silica gel, UIO-66 (a metal organic framework material) and other adsorption materials can be used in high humidity areas. The specific selection can be made according to actual conditions.

[0050] The moving mechanism is arranged in the transparent cover body 1, and the adsorbent assembly 2 is arranged on the moving mechanism, and the moving mechanism can drive the adsorbent assembly 2 to switch between the airflow zone and the illumination zone outside the airflow zone. The illumination zone outside the above-mentioned airflow zone refers to the area outside the airflow zone where the sunlight can directly shine. When the moving mechanism drives the adsorbent assembly 2 to the airflow zone, the moisture of the air in the airflow zone is absorbed by the adsorbent 18, and then the moving mechanism drives the adsorbent assembly 2 to the illumination zone outside the airflow zone. Under the action of light, the moisture in the adsorbent 18 evaporates and dehydrates, so that the water vapor content in the transparent cover body 1 increases. After turning on the first fan 6, the outside air can quickly enter the transparent cover body 1, and the adsorption rate of the adsorbent 18 on moisture is accelerated under the action of convection, and the adsorption heat is forced to be discharged to cool the adsorbent 18.

[0051] The water condensation component 8 is connected to the transparent cover body 1, and the water condensation component 8 is made of heat conductive material and is provided with a drain port 14. The shading component 4 is used to block sunlight, and the water condensation component 8 is located in a shadow area formed by the shading component 4 blocking sunlight, that is, under the action of the shading component 4, the water condensation component 8 will not be exposed to sunlight.

[0052] The cold air provided by the cold air system blows toward the water condensation component 8 to cool the water condensation component 8. The cold air system can blow cold air toward the water condensation component 8 to reduce the temperature of the water condensation component 8. When the temperature of the water condensation component 8 is low, the water vapor inside the transparent cover body 1 encounters the water condensation component 8 and condenses into water droplets on the surface of the water condensation component 8.

[0053] With such a configuration, the self-watering device in this embodiment, under the driving action of the first fan 6, outside air enters from the air inlet 5 of the transparent cover body 1 and is discharged from the air outlet 7. When the airflow flows through the inside of the transparent cover body 1, the moisture in the air can be adsorbed by the adsorbent 18 in the airflow area. As the moving mechanism moves, the adsorbent 18 is driven to the illuminated area outside the airflow area. Under the irradiation of sunlight, the moisture in the adsorbent 18 evaporates. Since the condensation component 8 is made of heat-conducting material, the cold air system can cool the condensation component 8, and the condensation component 8 is located in the shadow area formed by the shading component 4, which can prevent the condensation component 8 from being heated by sunlight. When the water vapor in the air encounters the condensation component 8 with a lower temperature, it will condense into water in the condensation component 8 and be discharged from the drain port 14 of the condensation component 8.

[0054] When using the self-watering device provided in this embodiment, the drain port 14 of the condensation component 8 can be aligned with the evaporative cooling medium 16 of the roof, so that the water discharged from the drain port 14 falls on the evaporative cooling medium 16, thereby forming a cooling effect on the roof.

[0055] In summary, the self-watering device provided in this embodiment can draw water from the air to provide a water source for evaporative cooling of the roof even in areas with less water resources, thereby achieving energy-saving and water-saving effects.

[0056] In a further embodiment, the cold air system includes an air duct 15 and a second fan 11 , the air duct 15 passes through an evaporative cooling medium 16 on the roof, and the second fan 11 is used to drive external air to pass through the air duct 15 and blow toward the water condensation component 8 .

[0057] Specifically, the air duct 15 may be composed of a pair of side panels and a top panel connected to the top of the pair of side panels. The evaporative cooling medium 16 of the roof is located at the bottom of the air duct 15 and is covered by the air duct 15 .

[0058] In addition, the top plate may be a heat-insulating layer 12 made of heat-insulating material, and the self-watering device is arranged above the air duct 15 through the heat-insulating layer 12, thereby ensuring that the airflow in the air duct 15 has a relatively low temperature.

[0059] The drain port 14 of the condensation component 8 can penetrate the top of the air duct 15, and drain water from the top of the air duct 15 to the evaporative cooling medium 16 on the roof. The water on the evaporative cooling medium 16 evaporates rapidly under the action of the air flow, thereby achieving the effect of lowering the roof temperature and the air flow temperature in the air duct 15.

[0060] With such arrangement, the temperature of the air blown toward the condensation component by the second fan 11 is relatively low, and the cold air generated by evaporation of the evaporative cooling medium 16 is used to cool the water condensation component 8, thereby further achieving the effect of energy saving.

[0061] In a further embodiment, the moving mechanism includes a rotating bracket 3 and a motor, the rotating bracket 3 is rotatably disposed in the transparent cover 1, and there are multiple adsorbent assemblies 2, which are distributed on the rotating bracket 3 along the rotation direction of the rotating bracket 3. The motor is transmission-connected to the rotating bracket 3 to drive the rotating bracket 3 to rotate.

[0062] Specifically, the rotating bracket 3 may include a central portion and a plurality of supporting rods, the central portion is installed in the transparent cover 1 through a rotating shaft, the first end of each supporting rod is connected to the central portion, and the plurality of supporting rods are distributed in a circular shape with the central portion as the center, and the second end of each supporting rod is connected to the adsorbent assembly 2. The motor is transmission-connected to the central portion of the rotating bracket 3.

[0063] With such arrangement, the motor can drive the rotating bracket 3 to rotate regularly, and the multiple adsorbent components 2 distributed around the rotating bracket 3 continuously circulate into the airflow area and the illumination area of ​​the non-airflow area, thereby being able to continuously draw water and dehydrate, and the drawing water and dehydration are carried out synchronously, thereby being able to continuously supply water to the evaporative cooling medium 16 on the evaporative roof. The rotation speed of the motor can be controlled by a speed control device 22 arranged outside the transparent cover 1, and by controlling the rotation speed of the motor, the switching speed of drawing water and dehydration can be controlled.

[0064] In a further technical solution, the motor, the first fan 6 and the second fan 11 can be powered by a solar power generation device. Such an arrangement further achieves the technical effect of energy saving and environmental protection.

[0065] In a further embodiment, a heat sink 10 is disposed on the outer side of the water condensation component 8. The heat sink 10 may be a fin-type heat sink, and the material may be copper, aluminum or the like.

[0066] In this way, the heat sink 10 is arranged on the outside of the water condensation component 8, which can enable the water condensation component 8 to quickly dissipate heat and cool down, ensuring that the water condensation component 8 is always in a low temperature state, thereby ensuring the water condensation effect.

[0067] In a further embodiment, an opening is provided at the lower portion of the transparent cover body 1, the water condensation component 8 is a conical structure, and the cross-section of the conical structure gradually decreases from top to bottom, an opening is provided at the upper end of the water condensation component 8, and the opening of the water condensation component 8 is connected to the opening of the transparent cover body 1.

[0068] Specifically, the transparent cover 1 can be set to a hemispherical structure, the water condensation component 8 is a conical structure, and the radius of the lower end surface of the transparent cover 1 is equal to the radius of the upper end surface of the water condensation component 8, so that the lower end surface of the transparent cover 1 and the upper end surface of the water condensation component 8 can be aligned and connected. The drain port 14 of the water condensation component 8 is set at the lower end position, that is, at the tip of the conical structure.

[0069] With such arrangement, the structure of the water condensation component 8 can play a confluence role, and the water drops condensed on the inner side of the water condensation component 8 can be gathered to the lower end of the water condensation component 8 and discharged from the drain port 14 .

[0070] In addition, in this embodiment, the drain port 14 may be provided with a drain valve 13, and the drain flow rate is controlled by the drain valve 13, thereby controlling the water supply of the evaporative cooling medium 16 on the roof. Further, a temperature and humidity sensor 17 may be provided in the air duct 15, and the temperature and humidity sensor 17 may sense the air flow temperature and humidity in the air duct 15. The temperature and humidity sensor 17 is communicatively connected to the drain valve 13, and the opening of the drain valve 13 is controlled according to the air flow temperature and humidity sensed by the temperature and humidity sensor 17. For example, when the air flow temperature is higher than the preset temperature and the air flow humidity is lower than the preset humidity, the opening of the drain valve 13 may be controlled to increase to increase the water supply.

[0071] In a further embodiment, the shading component 4 can be a shading plate arranged around the transparent cover body 1, and the upper surface of the shading plate is a reflective surface. The reflective surface can be specifically a reflective coating arranged on the shading plate, under the effect of the reflective coating, a better shading effect can be formed.

[0072] The shading component 4 may partially extend into the interior of the transparent cover 1 to form a wider shading range to prevent sunlight from irradiating on the water condensation component 8 .

[0073] In a further embodiment, the adsorbent assembly 2 further includes an adsorbent container 21 , an end of the adsorbent container 21 is provided with an opening, the adsorbent 18 is filled in the opening, and the wall material of the adsorbent container 21 is a heat-insulating material.

[0074] Specifically, the wall material of the adsorbent container 21 can be a polyurethane material, the thermal conductivity of the polyurethane material is ≤0.025W / M·K, and the inner and outer surfaces of the polyurethane material can be coated with a high temperature resistant IR reflective coating. In order to increase the thermal conductivity of the adsorbent 18, the adsorbent 18 can be filled into a porous thermal conductive material 20 with good thermal conductivity. The porous thermal conductive material 20 can specifically be porous foam copper, and the thermal conductivity can reach 600W / m·k, and then placed in the adsorbent container 21.

[0075] In order to prevent the airflow from affecting the adsorbent 18 during the adsorption process, a hydrophobic filter membrane 19 can be provided on the surface of the adsorbent 18. In this embodiment, the hydrophobic microporous PTFE of the hydrophobic filter membrane 19 can have a pore size of 0.45 μm, so as to separate the adsorbent 18 from the air without affecting the transmission of water vapor.

[0076] In a further embodiment, the inner surface of the water condensation component 8 is provided with a hydrophobic coating 9. In this way, the water droplets condensed on the inner surface of the water condensation component 8 will not adhere to the inner side of the water condensation component 8, which is conducive to the collection of condensed water.

[0077] Another embodiment of the present invention further provides an evaporative cooling roof system, including an evaporative cooling medium 16 arranged on the roof and a self-watering device of the evaporative cooling roof system as described in any of the above embodiments, wherein the drain outlet 14 of the condensation component 8 of the self-watering device corresponds to the evaporative cooling medium 16, that is, the water discharged from the drain outlet 14 of the condensation component 8 can flow into the evaporative cooling medium 16.

[0078] It should be noted that the roof structure in the evaporative cooling roof system can be specifically configured as follows: the roof structure can be sequentially provided with an evaporative cooling medium 16, a waterproof layer, a leveling layer, a thermal insulation layer, a leveling layer, and a roof structure layer from top to bottom. The evaporative cooling medium 16 can be a porous medium, which can absorb water and form a water film on the surface of the porous medium to evaporate and absorb heat, thereby reducing the indoor temperature.

[0079] With such a configuration, the evaporative cooling roof system provided in this embodiment can solve the problem that the development of evaporative roof technology in water-scarce areas is limited due to water shortage. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effect brought about by the above-mentioned self-watering device, and will not be repeated here.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-watering device for an evaporative cooling roof system, characterized in that: include: The transparent cover is provided with corresponding air inlets and air outlets; A first fan, used for driving airflow to enter the transparent cover through the air inlet and be discharged through the air outlet, and an airflow area is formed between the air inlet and the air outlet; an adsorbent assembly including an adsorbent for absorbing moisture from air; A moving mechanism is arranged in the transparent cover, and the adsorbent assembly is arranged on the moving mechanism, and the moving mechanism can drive the adsorbent assembly to switch between the airflow area and the illumination area outside the airflow area; A water condensation component is connected to the transparent cover body, and the water condensation component is a heat conductive material and is provided with a drain port; A shading component is used to block sunlight, and the water condensation component is located in a shadow area formed by the shading component; the shading component is a shading plate arranged around the transparent cover body, and the upper surface of the shading plate is a reflective surface; A cold air system provides cold air that blows toward the condensation component to cool the condensation component; the cold air system includes an air duct and a second fan, the air duct passes through the evaporative cooling medium on the roof, and the second fan is used to drive the outside air to pass through the air duct and blow toward the condensation component.

2. The self-watering device of the evaporative cooling roof system according to claim 1, characterized in that: The outer side of the water condensation component is provided with a heat sink, and the inner surface of the water condensation component is provided with a hydrophobic coating.

3. The self-watering device of the evaporative cooling roof system according to claim 1, characterized in that: The moving mechanism comprises: A rotating bracket is rotatably disposed in the transparent cover, and the adsorbent assembly is multiple and distributed on the rotating bracket along the rotation direction of the rotating bracket; The motor is connected to the rotating bracket to drive the rotating bracket to rotate.

4. The self-watering device of the evaporative cooling roof system according to claim 1, characterized in that: The lower end of the transparent cover is provided with an opening, the water condensation component is a conical structure, and the cross section of the conical structure gradually decreases from top to bottom, the upper end of the water condensation component is provided with an opening, and the opening of the water condensation component is connected to the opening of the transparent cover.

5. The self-watering device of the evaporative cooling roof system according to claim 1, characterized in that: The adsorbent assembly further comprises an adsorbent container. An opening is arranged at the end of the adsorbent container. The adsorbent is filled in the opening. The wall material of the adsorbent container is a heat insulating material.

6. The self-watering device of the evaporative cooling roof system according to claim 5, characterized in that: The surface of the adsorbent is provided with a hydrophobic filter membrane; a porous heat-conducting material is provided in the adsorbent container, and the adsorbent is filled in the porous heat-conducting material.

7. The self-watering device of the evaporative cooling roof system according to claim 3, characterized in that: It also includes a solar power generation device, which is used to supply electric energy to the first wind turbine, the second wind turbine and the motor.

8. An evaporative cooling roof system, characterized in that: It comprises an evaporative cooling medium arranged on the roof and a self-watering device of the evaporative cooling roof system according to any one of claims 1 to 7, wherein the drainage port of the condensation component corresponds to the evaporative cooling medium.

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