JP7282559B2 - Air circulation system, building, and method for supporting photocatalyst - Google Patents

Description

The present invention relates to an air circulation system and to a building equipped with such an air circulation system.

Conventionally, for example, an air purifier with a built-in VOC adsorption filter such as activated carbon, or an air purifier with a photocatalyst filter installed in the room is installed to remove volatile organic compounds (VOCs) contained in the indoor air of a building. It is known to reduce, decompose and remove contaminants such as volatile organic compounds)).

However, in removal by activated carbon, it was assumed that the activated carbon adsorption capacity would break through depending on the VOC concentration and usage time, and it was necessary to periodically replace the activated carbon filter. In addition, when an air purifier is placed indoors, there are inconveniences in daily life such as narrowing of the indoor space.

In addition, in Patent Document 1, the ceiling of the indoor space in the building is composed of a surface material having moderate breathability, the indoor air is guided from a part of the ceiling to the space behind the ceiling, and another part of the ceiling An air circulation system is disclosed that returns air from the air to the room. In this air circulation system, a paint containing a component that decomposes organic matter in the air is applied to the surface of a breathable ceiling material, and air is passed through the breathable ceiling material to reduce VOC emissions. can be disassembled.

JP 2008-303697 A

By the way, in recent buildings, since the ceiling of the indoor space is also required to have high heat insulation and sound insulation, various members such as heat insulation and sound insulation are arranged on the ceiling material. By restricting the range of the ceiling material that can be coated with the paint that decomposes organic matter, these materials aimed at improving various performances can sufficiently decompose contaminants such as VOCs contained in the air flowing through the space above the ceiling. may not be possible.

Therefore, the present invention provides an air circulation system and a building that can effectively reduce contaminants such as VOCs contained in the air in the indoor space without installing equipment such as an air purifier indoors. for the purpose.

The air circulation system according to the present invention is an air circulation system that circulates the air in the indoor space in the attic space between the floor material or roof material on the upper floor and the ceiling on the lower floor,
A photocatalyst is supported on the lower surface of the upper floor material or roof material exposed in the space above the ceiling,
An intake port and an air outlet are provided in the lower floor ceiling,
a light source installed in the ceiling space and irradiating the photocatalyst with light;
and a circulation flow control device installed in at least one of the air inlet, the air outlet, and the space above the ceiling to circulate air.

In addition, in the air circulation system of the present invention, it is preferable that the upper floor material or the roof material is a porous body.

Further, in the air circulation system of the present invention, it is preferable that the circulating flow control device is provided at either one of the intake port and the blowout port, or at both of them.

Moreover, in the air circulation system of the present invention, it is preferable that the space above the ceiling is not provided with a partition wall for controlling the circulation flow.

Further, in the air circulation system of the present invention, it is preferable that the upper floor material or roof material is an ALC panel.

A building according to the present invention is characterized by comprising any one of the air circulation systems described above.

According to the present invention, it is possible to provide an air circulation system and a building that can effectively reduce contaminants such as VOCs contained in the air in the indoor space without installing equipment such as an air purifier in the room. be able to.

1 is a longitudinal sectional view of a building equipped with an air circulation system according to an embodiment of the invention; FIG.

An embodiment of the present invention will be described below with reference to the drawings. In addition, the same code|symbol is attached|subjected to the structure which is common in each figure.

Here, the overall configuration of a building will be described as an example. The building can be, for example, a two-story house with a steel frame. A building is composed of a foundation structure fixed to the ground and an upper structure fixed on the foundation structure. The building may be a detached house, an apartment complex, or a building other than a house.

The foundation structure is positioned below the upper structure and supports the framework thereof. The superstructure consists of a framework (framework) composed of multiple columns and multiple beams that span between the pillars, outer walls arranged on the outer peripheral side of the frame, and placed on the beams that make up the frame. It can be configured to have a floor and a roof of each floor. It should be noted that the members constituting the frame can be standardized (standardized) in advance, manufactured in a factory in advance, and then transported to and assembled at a construction site.

The building comprises an outer wall surrounding the perimeter of the building. The outer wall is composed of a plurality of panel-shaped outer wall materials arranged in a continuous manner, a heat insulating material arranged on the indoor side of the outer wall materials, an inner layer material, and the like. The outer wall material may be, for example, an outer wall panel made of lightweight cellular concrete (ALC), but is not particularly limited.

In addition, the floor of each floor includes floor materials (floor support members). The floor material can be composed of ALC panels, for example. The floor of the first floor can be formed by laying floor materials on the foundation structure. In addition, the floor of the second floor and the floor of the roof floor can be formed by installing floor materials between beam members. In addition, the floor of each floor may include a floor finishing member such as flooring that constitutes a floor finishing layer, in addition to the floor material.

The air circulation system 1 of this embodiment shown in FIG. 1 circulates the air in the indoor space 10 of the building to the ceiling space 20 provided above the indoor space 10. It decomposes contaminants such as VOCs and returns them to the indoor space 10 again. The indoor space 10 is defined by, for example, a floor 11, walls 12 such as outer walls, and a ceiling 13 (lower floor ceiling).

The ceiling 13 can be composed of a face material such as a gypsum board fixed to a frame such as a beam through a ceiling joist, a ceiling joist receiver, a hanging hardware, or the like, for example. The ceiling 13 is provided with an intake port 14 and a blowout port 15 for communicating the indoor space 10 and the ceiling space 20 . In addition, blowers (fans) 16 and 17 as circulation flow control devices are provided at the intake port 14 and the blowout port 15, respectively. A blower 16 provided at the air intake 14 promotes movement of air from the indoor space 10 to the ceiling space 20 through the air intake 14 . A blower 17 provided at the blowout port 15 promotes movement of air from the ceiling space 20 to the indoor space 10 through the blowout port 15 . The air intake port 14 and the air outlet 15 can be circular through holes in plan view, but the shapes of the air intake port 14 and the air outlet 15 can be changed as appropriate.

Here, in the present embodiment, since the air blowers 16 and 17 are provided at the air intake port 14 and the air outlet 15, respectively, the circulation of the air from the indoor space 10 through the ceiling space 20 and back to the indoor space 10. can increase The circulating flow control device may be installed at least one of the intake port 14, the blowout port 15, and the space 20 above the ceiling.

The ceiling space 20 of the present embodiment is defined by a floor material 21 forming the floor of the upper floor, a ceiling 13 on the lower floor side, and walls 12 such as outer walls. In this example, no partition walls are provided to partition the space 20 in the ceiling space into a plurality of spaces, but the partition walls may be provided in the space 20 in the ceiling space.

A photocatalyst capable of decomposing contaminants such as VOCs by irradiation with light (ultraviolet rays) is supported on the lower surface 21a of the flooring 21 on the upper floor exposed to the space 20 above the ceiling. In addition, the photocatalyst may be supported on the entire lower surface 21a of the flooring material 21, or a region where no photocatalyst is supported may be provided on a part of the lower surface 21a of the flooring material 21. FIG. The photocatalyst used here can be a material that has the function of generating hydroxyl radicals and superoxide anions from water molecules in the atmosphere by light irradiation. For example, titanium oxide, tungsten oxide, zirconium oxide, etc. are used. can be, but are not limited to.

As a method for supporting the photocatalyst on the lower surface 21a of the flooring material 21, it is possible to apply a paint or the like containing the photocatalyst to the lower surface 21a of the flooring material 21. For example, spray coating, roller coating, or the like is applied on site. Alternatively, it may be painted at a processing plant for the floor material 21 (ALC plate). The method for supporting the photocatalyst on the lower surface 21a of the flooring 21 is not particularly limited. In addition, in this embodiment, since a porous ALC panel is used for the floor material 21, a minute recess is formed in the lower surface 21a, and the inner surface of the recess is included while the shape of the recess is left. A photocatalyst is supported on the entire lower surface 21a.

In addition, by using the lower surface 21a of the floor material 21 as the photocatalyst-carrying surface, the gaseous contaminants can be efficiently brought into contact with the photocatalyst. That is, for example, if the photocatalyst is supported on the upper surface of the ceiling material constituting the ceiling 13 instead of the lower surface 21a of the floor material 21, the air circulation in the ceiling space 20 causes floating dust, fine particle dust, and other solid particles. pollutants fall on the top surface of the ceiling material and may cover the top surface of the ceiling material. As a result, it may become a factor that prevents the contact between the gaseous contaminant and the photocatalyst, or it may become a factor that prevents the irradiation of the photocatalyst surface with light, which is not very preferable. Therefore, in this example, the lower surface 21a of the flooring material 21, not the upper surface of the ceiling material, is used as the photocatalyst-carrying surface so that the gaseous contaminants can be brought into contact with the photocatalyst efficiently.

A light source 30 capable of irradiating a photocatalyst carried on the lower surface 21 a of the floor material 21 with light is provided in the ceiling space 20 . The light source 30 may be, for example, a UV LED having a light source wavelength of 380 nm or less, or a UV fluorescent lamp, but is not particularly limited as long as the photocatalyst used can exert its catalytic action. At least one light source 30 may be provided in the ceiling space 20, but it is preferable that the light sources 30 are evenly arranged at intervals so that the entire lower surface 21a of the floor material 21 can be evenly illuminated. preferable. Also, the light source 30 is installed at a predetermined height from the upper surface of the ceiling 13 . The light source 30 may be installed directly on the upper surface of the ceiling 13, or may be installed on the ceiling 13 via a connecting member or the like. Further, the light source 30 may be suspended from the floor material 21 and held.

The ceiling space 20 is, for example, a space defined between the indoor space 10 on the lower floor side and the indoor space 40 on the upper floor of the indoor space 10 . For example, when the indoor space 10 is a room on the top floor, or when the indoor space 10 is a room on the first floor of a one-story building, the ceiling space 20 is divided between the indoor space 10 and the roof material. It can be a space that is formed.

That is, the attic space 20 is defined between the floor material 21 or the roof material on the upper floor side and the ceiling 13 .

In the air circulation system 1 of the present embodiment, the photocatalyst supported on the lower surface 21a of the flooring 21 is irradiated from the light source 30 by activating the blowers (fans) 16 and 17 and lighting the light source 30. decomposes pollutants such as VOCs in the air passing through the ceiling space 20 in response to the light emitted. That is, contaminants such as VOCs contained in the air in the indoor space 10 are decomposed when passing through the ceiling space 20 , and clean air returns to the indoor space 10 . In addition, in this embodiment, since the photocatalyst is supported on the lower surface 21a of the floor material 21, a heat insulating material, a sound insulating material, etc. can be arranged on the upper surface of the ceiling 13 to improve the performance of the ceiling 13. In other words, even if a heat insulating material, a sound insulating material, or the like is arranged on the upper surface of the ceiling 13, the action of the photocatalyst carried on the lower surface 21a of the floor material 21 is not hindered, so the VOC reduction effect of the air circulation system 1 can be sufficiently obtained. can be demonstrated in In addition, in the air circulation system 1 of the present embodiment, the air in the indoor space 10 is circulated to the space 20 above the ceiling and purified in the space 20 above the ceiling (decomposing pollutants such as VOCs). , there is no need to install equipment such as an air purifier in the indoor space 10. - 特許庁

As described above, according to the air circulation system 1 of the present embodiment, pollutants such as VOCs contained in the air in the indoor space 10 can be effectively reduced without installing a device such as an air cleaner in the indoor space 10. It becomes possible to

In addition, in this embodiment, the floor material 21 is comprised with the ALC panel. The ALC panel is a porous body, and minute recesses are formed in its lower surface 21a. Therefore, the surface area of the lower surface 21a of the flooring 21 exposed to the ceiling space 20 is larger than the area (projected area) of the flooring 21 in plan view. In this way, the area of the photocatalyst carried on the surface of the lower surface 21a is increased by the increased surface area of the lower surface 21a due to the minute recesses, thereby improving the ability to decompose pollutants. In addition, the air flowing near the lower surface 21a of the flooring material 21 enters the minute recesses, and the contaminants come into contact with and adsorb to the surface. is more accelerated. As a result, pollutants in the air passing through the ceiling space 20 can be decomposed more efficiently. For the reasons described above, the upper floor material 21 or the roof material supporting the photocatalyst is preferably a porous material.

In addition, in the air circulation system 1 of the present embodiment, the blowers 16 and 17 as circulation flow control devices are provided at the intake port 14 and the discharge port 15, so that the circulation flow control device is installed in the ceiling space 20. Installation is not required, and maintenance work can be easily performed from the indoor space 10 side. In addition, since the circulating flow control device is not installed in the space 20 above the ceiling, there is no need to provide a partition wall for controlling the circulating flow in the space 20 above the ceiling. Therefore, it is possible to reduce installation costs and the like of partition walls.

The present invention is not limited to the configurations of the above-described embodiments, and can be implemented in various configurations without departing from the scope of the claims. For example, in the above-described embodiment, the air blowers 16 and 17 are provided at the air intake port 14 and the air outlet 15, respectively. may be set to In this case, a partition wall is provided to separate the ceiling space 20 into an upstream space on the side of the air inlet 14 and a downstream space on the side of the air outlet 15, and a circulation flow control device is provided in the communication hole provided in the partition wall. Accordingly, when the circulation flow control device is operated, a negative pressure is generated in the upstream space and a positive pressure is generated in the downstream space. As a result, the air in the indoor space 10 moves to the upstream space of the ceiling space 20 through the air inlet 14 by negative pressure, then moves to the downstream space through the communication hole, and is further blown out from the downstream space by positive pressure. It circulates through the port 15 into the interior space 10 .

1: Air circulation system 10: Indoor space 11: Floor 12: Wall 13: Ceiling (lower floor ceiling)
14: Intake port 15: Blowout port 16, 17: Air blower (circulating flow control device)
20: Ceiling space 21: Floor material (upper floor floor material)
21a: lower surface of flooring 30: light source

Claims (7)

An air circulation system that circulates the air in the indoor space in the attic space between the floor material or roof material on the upper floor and the ceiling on the lower floor,
A photocatalyst is supported on the lower surface of the upper floor material or roof material exposed in the space above the ceiling,
An intake port and an air outlet are provided in the lower floor ceiling,
a light source installed in the ceiling space and irradiating the photocatalyst with light;
a circulation flow control device installed in at least one of the air inlet, the air outlet, and the space above the ceiling to circulate air ;
The air circulation system , wherein the upper floor material or roof material is a porous body having minute recesses formed in the lower surface . 2. The air circulation system according to claim 1, wherein at least one of a heat insulating material and a sound insulating material is arranged on the upper surface of the lower floor ceiling. 3. The air circulation system according to claim 1 or 2, wherein said circulation flow control device is provided at either one of said intake port and said outlet port, or at both of them. The air circulation system according to any one of claims 1 to 3, wherein the space above the ceiling is not provided with a partition wall for controlling circulation flow. The air circulation system according to any one of claims 1 to 4, wherein the upper story flooring or roofing material is an ALC panel. A building comprising the air circulation system according to any one of claims 1 to 5. A photocatalyst supporting method, wherein the photocatalyst of the air circulation system according to any one of claims 1 to 5 is supported on the lower surface of the upper floor material or roof material,
Applying the paint containing the photocatalyst to the lower surface of the upper floor material or roof material on site by spray coating or roller coating, or applying the paint at a processing plant for the upper floor material or roof material. A method for supporting a photocatalyst, which is coated by .

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