KR102585203B1 - Photocatalyst Module - Google Patents
Photocatalyst Module Download PDFInfo
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- KR102585203B1 KR102585203B1 KR1020210048157A KR20210048157A KR102585203B1 KR 102585203 B1 KR102585203 B1 KR 102585203B1 KR 1020210048157 A KR1020210048157 A KR 1020210048157A KR 20210048157 A KR20210048157 A KR 20210048157A KR 102585203 B1 KR102585203 B1 KR 102585203B1
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- South Korea
- Prior art keywords
- fan
- duct
- photocatalyst
- central axis
- led
- Prior art date
Links
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 48
- 238000007664 blowing Methods 0.000 claims abstract description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 230000001954 sterilising effect Effects 0.000 description 8
- 238000004659 sterilization and disinfection Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000006552 photochemical reaction Methods 0.000 description 2
- 238000004887 air purification Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
- A61L9/18—Radiation
- A61L9/20—Ultra-violet radiation
- A61L9/205—Ultra-violet radiation using a photocatalyst or photosensitiser
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/002—Catalysts characterised by their physical properties
- B01J35/004—Photocatalysts
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- B01J35/39—
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
- F24F8/167—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using catalytic reactions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/20—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation
- F24F8/22—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using UV light
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
- A61L2209/10—Apparatus features
- A61L2209/12—Lighting means
Abstract
광촉매모듈에 관한 발명이 개시된다. 개시된 광촉매모듈은;
팬의 상방에 위치하여 팬으로부터 불어 들어온 바람을 측방으로 배출시키는 덕트;
팬과 덕트 사이에 위치하여, UV 광을 덕트로 투사시켜주는 UV LED; 로 구성되는 것을 특징으로 하는 광촉매모듈로 구성된다. An invention relating to a photocatalyst module is disclosed. The disclosed photocatalyst module is;
A duct located above the fan to discharge the wind blowing from the fan to the side;
UV LED, located between the fan and the duct, projects UV light into the duct; It consists of a photocatalyst module characterized in that it consists of.
Description
본 발명은 광촉매 모듈에 관한 것으로, 광촉매 물질에 UV LED를 조사하면 광화학반응이 발생하고 이를 이용하여 공기를 살균 및 정화 시켜주는 것에 관한 것이다. The present invention relates to a photocatalyst module, which generates a photochemical reaction when a UV LED is irradiated to a photocatalyst material and uses this to sterilize and purify the air.
최근 UV LED를 이용한 살균 장치가 각광 받고 있다. 이중, 이산화티타늄(TiO2)에 UV를 조사하면 광화학반응이 촉진되는 것을 이용한 광촉매방식이 있는데, 각종 오염물질을 산화 및 분해시키고 탈취 효과도 탁월하며, 수명도 반영구적이어서 공기의 살균, 정화 및 정수 분야에 널리 사용되고 있다. Recently, sterilization devices using UV LEDs have been in the spotlight. Among them, there is a photocatalyst method that utilizes the fact that UV irradiation on titanium dioxide (TiO 2 ) promotes photochemical reactions. It oxidizes and decomposes various pollutants, has an excellent deodorizing effect, and has a semi-permanent lifespan, so it is used for sterilizing, purifying, and purifying the air. It is widely used in the field.
한편, 본 발명의 선행기술로서, 대한민국 특허공개공보 10-2015-0034872에 의해 제안된 광촉매 모듈이 있다. Meanwhile, as prior art to the present invention, there is a photocatalyst module proposed by Korean Patent Publication No. 10-2015-0034872.
선행기술에서 광촉매재를 향해 광공급부가 빛을 조사해 주는데, 광촉매재는 다공성 금속산화물로 구성되어 있다. 여기서 다수의 구멍을 통해 공기가 흐르는데, 광공급부의 빛이 광촉매재의 구멍 내부에는 효과적으로 도달할 수가 없으므로, 오염물질 제거에 한계가 있을 수 밖에 없는 문제를 가지고 있다. In prior art, a light supply unit irradiates light toward a photocatalyst, and the photocatalyst is composed of porous metal oxide. Here, air flows through multiple holes, but since the light from the light supply unit cannot effectively reach the inside of the holes of the photocatalyst, there is an inevitable problem that there is a limit to the removal of contaminants.
또한, 광 촉매 반응은 광촉매재의 표면에서만 일어나기 때문에, 표면 근처를 지나가는 공기에 대해서만 효과를 가지는 한계가 있다. Additionally, since the photocatalytic reaction occurs only on the surface of the photocatalyst, there is a limitation that it is effective only on air passing near the surface.
하방에서 상방으로 공기를 불어주는 팬;A fan that blows air from downward to upward;
팬의 상방에 위치하여 팬으로부터 불어 들어온 바람을 측방으로 배출시키는 덕트;A duct located above the fan to discharge the wind blowing from the fan to the side;
팬과 덕트 사이에 위치하여, UV 광을 덕트로 투사시켜주는 UV LED; 로 구성되는 것을 특징으로 한다. UV LED, located between the fan and the duct, projects UV light into the duct; It is characterized by being composed of.
또한, 상기 덕트는 팬의 중심축을 포함하는 단면상에서, 팬으로부터 불어오는 바람과 UV 광이 내부로 유입되도록 중심축 주변의 하방이 열려 있고; In addition, in the cross section including the central axis of the fan, the duct is open on the lower side around the central axis to allow wind blowing from the fan and UV light to flow into the duct;
바람과 UV광이 상부로 빠져나가지 못하도록 상방이 막혀 있고;The top is blocked to prevent wind and UV light from escaping through the top;
바람이 측방으로 배출되도록 양측방이 열려 있는 것을 특징으로 한다. It is characterized by being open on both sides so that wind is discharged to the sides.
또한, 상기 덕트의 상단면에 광촉매층이 구비되는 것을 특징으로 한다. In addition, a photocatalyst layer is provided on the upper surface of the duct.
또한, 상기 광촉매층은 이산화티타늄이 포함되는 것을 특징으로 한다. Additionally, the photocatalyst layer is characterized in that it contains titanium dioxide.
또한, 상기 덕트는 팬의 중심축을 포함하는 단면상에서, 덕트의 상단면은 팬의 중심축 근처의 면이 팬을 향해 아래로 볼록하게 형성되어 있어, 바람의 방향 전환이 용이하도록 한 것을 특징으로 한다. In addition, in the cross section including the central axis of the fan, the duct is characterized in that the upper surface of the duct near the central axis of the fan is convex downward toward the fan, making it easy to change the direction of the wind. .
또한, 상기 UV LED의 측방을 감싸는 형상을 가지는 리플렉터를 포함하는 것을 특징으로 한다. In addition, it is characterized by including a reflector having a shape surrounding the side of the UV LED.
또한, 상기 덕트는 팬의 중심축을 포함하는 단면상에서, 덕트의 상단면이 평면인 형상인 것을 포함한다. Additionally, the duct includes a shape in which the upper surface of the duct is flat in a cross-section including the central axis of the fan.
또한, 상기 덕트의 하단면에 광촉매층이 구비되는 것을 포함한다. Additionally, a photocatalyst layer is provided on the bottom surface of the duct.
본 발명은 UV광을 광촉매층에 효과적으로 투사 시키고, 흐르는 공기의 대부분을 광촉매층의 표면과 접촉 하도록 하여 공기정화 효과를 극대화 할 수 있다. The present invention can maximize the air purification effect by effectively projecting UV light onto the photocatalyst layer and allowing most of the flowing air to contact the surface of the photocatalyst layer.
도1-A는 본 발명의 일 실시예에 따른 광촉매 모듈에서 공기의 흐름을 보인 것이다.
도1-B는 본 발명의 일 실시예에 따른 광촉매 모듈의 팬에서의 UV LED의 위치를 보인 것이다.
도2는 본 발명의 일 실시예에 따른 광촉매 모듈의 UV광이 조사되는 것을 보인 도면이다.
도3은 종래기술에서의 공기 흐름을 보인 것이다.
도4는 본 발명의 일 실시예에 따른 광촉매 모듈의 변형을 보인 것이다.
도5는 본 발명의 일 실시예에 따른 광촉매 모듈의 변형을 보인 것이다.
도6은 본 발명의 일 실시예에 따른 광촉매 모듈의 변형을 보인 것이다. Figure 1-A shows the flow of air in a photocatalyst module according to an embodiment of the present invention.
Figure 1-B shows the location of the UV LED in the fan of the photocatalyst module according to an embodiment of the present invention.
Figure 2 is a diagram showing UV light being irradiated from a photocatalyst module according to an embodiment of the present invention.
Figure 3 shows the air flow in the prior art.
Figure 4 shows a modification of the photocatalyst module according to an embodiment of the present invention.
Figure 5 shows a modification of the photocatalyst module according to an embodiment of the present invention.
Figure 6 shows a modification of the photocatalyst module according to an embodiment of the present invention.
이하, 첨부된 도면들을 참조하여 본 발명에 따른 광촉매모듈의 일 실시예를 설명한다. Hereinafter, an embodiment of a photocatalyst module according to the present invention will be described with reference to the attached drawings.
이 과정에서 도면에 도시된 선들의 두께나 구성요소의 크기 등은 설명의 명료성과 편의상 과장되게 도시되어 있을 수 있다. 또한, 후술되는 용어들은 본 발명에서의 기능을 고려하여 정의된 용어들로서 이는 사용자, 운용자의 의도 또는 관례에 따라 달라질 수 있다. 그러므로, 이러한 용어들에 대한 정의는 본 명세서 전반에 걸친 내용을 토대로 내려져야 할 것이다.In this process, the thickness of lines or sizes of components shown in the drawing may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.
도1-A 내지 도1-B를 살펴 보면, 팬(100)이 공기를 하방에서 상방으로 불어주도록 위치 되어 있고, 팬(100)의 상방에 덕트(300)가 위치하며, 팬(100)과 덕트(300) 사이에 UV LED(200) 가 위치 한다. 1-A to 1-B, the fan 100 is positioned to blow air from downward to upward, and the duct 300 is located above the fan 100, and the fan 100 and UV LED (200) is located between the ducts (300).
UV LED(200)는 상방으로 광을 투사 시키고, 팬(100)으로부터 불어오는 바람을 가리지 않기 위해, UV LED(200)가 실장된 PCB가 팬(100)의 중심축 근처에 위치하도록 한다.The UV LED 200 projects light upward, and in order not to block the wind blowing from the fan 100, the PCB on which the UV LED 200 is mounted is positioned near the central axis of the fan 100.
덕트(300)를 자세히 살펴보면, 상기 덕트(300)는 팬(100)의 중심축을 포함하는 단면상에서, 하단면(320)의 중심 축 부분이 열려 있어, 공기가 유입 되도록 한다. 유입된 공기는 UV 광이 조사되는 상단면(310)에서 부딪힌 후 측방으로 배출 할 수 있도록 상단면(310)은 막혀 있고, 측방은 열려있다. 여기서 덕트(300)의 상단면(310)은 TiO2와 같은 광촉매층(400)으로 전체 혹은 부분적으로 코팅되어 있고, 중심축 부근이 아래로 볼록하게 돌출된 형상을 가진다.Looking at the duct 300 in detail, in a cross section including the central axis of the fan 100, the central axis portion of the lower surface 320 is open to allow air to flow in. The top surface 310 is closed and the sides are open so that the introduced air can be discharged laterally after hitting the top surface 310 where UV light is irradiated. Here, the top surface 310 of the duct 300 is fully or partially coated with a photocatalyst layer 400 such as TiO2, and has a shape that protrudes convexly downward near the central axis.
도1-A 내지 도2를 살펴보면, 팬(100) 상부에 있는 UV LED(200)에서 조사된 UV광이 광촉매층(400)에 도달하게 된다. 광촉매층(400)에 UV가 조사된 상태에서, 팬(100)으로부터 출발한 공기가 UV LED(200)를 지나면서 UV광에 의한 1차 살균, 정화가 이루어지고, 광촉매층(400)에 접촉하면서 2차 살균, 정화가 된다. 1-A to 2, UV light irradiated from the UV LED 200 on the top of the fan 100 reaches the photocatalyst layer 400. With UV irradiated on the photocatalyst layer 400, the air from the fan 100 passes through the UV LED 200, undergoes primary sterilization and purification by UV light, and comes into contact with the photocatalyst layer 400. While doing so, secondary sterilization and purification occur.
한편, 광촉매에 의한 살균, 정화 효과는 광촉매층(400)의 표면에서만 발생하기 때문에, 광촉매층(400)과 접촉하는 공기가 많을수록 효과가 좋아진다. 도3의 예시와 같이, 종래의 구멍이 있는 격자구조등의 촉매재 단면을 보면, UV가 촉매 부재의 표면에만 조사되고, 공기가 통하는 구멍 내부로는 잘 조사되지 않는다. 더욱이, 촉매재와 접촉하지 않거나, 접촉하더라도, UV가 충분히 조사되지 않는 구멍 내부에서 접촉하는 바람에 대해서는 살균, 정화 효과에 한계가 있게 된다. Meanwhile, since the sterilization and purification effect by the photocatalyst occurs only on the surface of the photocatalyst layer 400, the more air that comes into contact with the photocatalyst layer 400, the better the effect. As shown in the example in Figure 3, when looking at the cross section of a catalyst material such as a conventional perforated lattice structure, UV is irradiated only to the surface of the catalyst member and is not irradiated to the inside of the pores through which air passes. Moreover, there is a limit to the sterilization and purification effect for wind that does not contact the catalyst material, or even if it does, contacts the inside of the hole where UV is not sufficiently irradiated.
반면에, 본원 발명은 팬(100)으로부터 유입된 모든 공기가 광촉매층(400)과 접촉후, 외부로 배출되므로 살균 및 정화 효과를 극대화 시킬 수 있다. On the other hand, in the present invention, all air introduced from the fan 100 is discharged to the outside after contacting the photocatalyst layer 400, thereby maximizing the sterilization and purification effects.
도4는 본 발명의 일 실시 예에 따른 변형을 보인 것으로, UV LED(200)에서 측방으로 발산하는 광을 덕트(300)의 상단면(310)으로 반사시키기 위해 리플렉터(500)가 구비되는 것을 포함한다. 리플렉터(500)의 크기, 곡률을 적당히 조절하여 UV광이 측방으로 향하는 UV광을 상방으로 방향전환 시켜 좁은 면적에 빛을 집중시켜 투사 시킬 수 있다. 이렇게 하면, 광촉매층(400)의 코팅 면적을 줄일 수 있다. 또한, 광촉매층(400)에 도달하지 못하고 측방으로 곧장 외부로 나가는 UV 광도 제거 할 수가 있게 된다. Figure 4 shows a modification according to an embodiment of the present invention, in which a reflector 500 is provided to reflect light radiating laterally from the UV LED 200 to the upper surface 310 of the duct 300. Includes. By appropriately adjusting the size and curvature of the reflector 500, the UV light directed to the side can be diverted upward, concentrating the light and projecting it onto a small area. In this way, the coating area of the photocatalyst layer 400 can be reduced. In addition, UV light that does not reach the photocatalyst layer 400 and goes straight to the outside can be removed.
여기서, 리플렉터(500) 대신 렌즈를 이용하여 UV광의 방향을 제어 할 수도 있다. Here, the direction of UV light can be controlled using a lens instead of the reflector 500.
도5는 본 발명의 일 실시 예에 따른 변형을 보인 것으로, 덕트(300)의 상단면(310)이 평면으로 구성되는 것을 포함한다. Figure 5 shows a modification according to an embodiment of the present invention, including that the top surface 310 of the duct 300 is configured as a flat surface.
도6은 본 발명의 일 실시 예에 따른 변형을 보인 것으로, 덕트(300)의 하단면(320)에 광촉매층(400)이 구비될 수 있다. 이는, 상단면(310)에 위치한 광촉매층(400)에 조사된 UV광의 일부가 흡수되지 못하고 반사되어 하단면(320)에 도달하는데, 하단면(320)에 광촉매층(400)이 구비되면 추가적인 살균, 정화 효과를 달성 할 수 있게 된다.Figure 6 shows a modification according to an embodiment of the present invention, in which a photocatalyst layer 400 may be provided on the bottom surface 320 of the duct 300. This means that part of the UV light irradiated to the photocatalyst layer 400 located on the top surface 310 is not absorbed and is reflected and reaches the bottom surface 320. When the photocatalyst layer 400 is provided on the bottom surface 320, additional UV light is not absorbed. Sterilization and purification effects can be achieved.
한편, 광촉매층(400)은 필요에 따라 ZnO, ZrO2, WO3 등 UV에 의해 촉매반응을 일으키는 물질로 구성될 수도 있다. Meanwhile, the photocatalyst layer 400 may be made of a material that causes a catalytic reaction by UV, such as ZnO, ZrO 2 , or WO 3 , if necessary.
10: 광촉매모듈
100: 팬
200: UV LED
300: 덕트
310: 상단면
320: 하단면
400: 광촉매층
500: 리플렉터10: Photocatalyst module
100: fan
200: UV LED
300: duct
310: top surface
320: bottom side
400: Photocatalyst layer
500: Reflector
Claims (8)
상기 광촉매층은 이산화티타늄이 포함되는 것을 특징으로 하는 광촉매 모듈In clause 1,
The photocatalyst module is characterized in that the photocatalyst layer contains titanium dioxide.
상기 UV LED의 측방을 감싸는 형상을 가지는 리플렉터를 포함하는 것을 특징으로 하는 광촉매모듈.In clause 1,
A photocatalyst module comprising a reflector having a shape surrounding the side of the UV LED.
상기 덕트는 팬의 중심축을 포함하는 단면상에서, 덕트의 상단면이 평면인 형상인 것을 포함하는 광촉매 모듈. In clause 1,
A photocatalyst module wherein the duct has a top surface that is flat in a cross-section including the central axis of the fan.
상기 덕트의 하단면에 광촉매층이 구비되는 것을 포함하는 광촉매 모듈. In clause 1,
A photocatalyst module comprising a photocatalyst layer provided on a lower surface of the duct.
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| JP2017225629A (en) | 2016-06-22 | 2017-12-28 | 美浜株式会社 | Sterilization apparatus |
| KR102202544B1 (en) * | 2020-06-02 | 2021-01-13 | 주식회사 에스엠엔테크 | High efficient airduct sterilizing air by photochemical reaction and thereby air cleaning devices |
| US20210038755A1 (en) | 2019-08-06 | 2021-02-11 | Aerus, Llc | Photocatalytic oxidation device for treatment of air |
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| KR20170039019A (en) * | 2015-09-30 | 2017-04-10 | 서울바이오시스 주식회사 | Air Purifier and Photocatalytic-Air Conditioning Module for Bed |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2017225629A (en) | 2016-06-22 | 2017-12-28 | 美浜株式会社 | Sterilization apparatus |
| US20210038755A1 (en) | 2019-08-06 | 2021-02-11 | Aerus, Llc | Photocatalytic oxidation device for treatment of air |
| KR102202544B1 (en) * | 2020-06-02 | 2021-01-13 | 주식회사 에스엠엔테크 | High efficient airduct sterilizing air by photochemical reaction and thereby air cleaning devices |
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