KR20170089046A - Ventilating device and system - Google Patents

Ventilating device and system Download PDF

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Publication number
KR20170089046A
KR20170089046A KR1020150187877A KR20150187877A KR20170089046A KR 20170089046 A KR20170089046 A KR 20170089046A KR 1020150187877 A KR1020150187877 A KR 1020150187877A KR 20150187877 A KR20150187877 A KR 20150187877A KR 20170089046 A KR20170089046 A KR 20170089046A
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KR
South Korea
Prior art keywords
air
ventilator
indoor air
radon concentration
room
Prior art date
Application number
KR1020150187877A
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Korean (ko)
Inventor
전찬혁
조승연
Original Assignee
주식회사 세스코
조승연
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Application filed by 주식회사 세스코, 조승연 filed Critical 주식회사 세스코
Priority to KR1020150187877A priority Critical patent/KR20170089046A/en
Publication of KR20170089046A publication Critical patent/KR20170089046A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
    • F24F11/0017—
    • F24F11/02—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
    • F24F2003/1696—
    • F24F2011/003—
    • F24F2011/0064—

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The ventilator according to an embodiment may include a ventilation unit for ventilating indoor air, a sensing unit for measuring the radon concentration of the room air, and a control unit for controlling the ventilating unit based on the radon concentration.

Description

[0001] VENTILATING DEVICE AND SYSTEM [0002]

The following description relates to a ventilator and a ventilating system for ventilating by detecting the radon concentration.

Radon is a naturally occurring radioactive gas, which can be naturally occurring in the soil or bedrock and naturally occurring from uranium.

Radon is a colorless, odorless inert gas that is the heaviest gas in nature and does not chemically react with other substances, but can be physically unstable because it has the property of emitting radiation. Then, it sticks to fine particles such as dust and wanders, and breathing can go through the respiratory system to the lungs.

Natural radiation is a part of the living environment of mankind, and about half of the natural radiation exposure dose of human beings may be the exposures due to the respiratory exposure of natural radon and its offspring nuclides.

For example, Korean Patent Laid-Open No. 2001-0103440 discloses an on-line radon concentration measurement system capable of measuring and evaluating the behavior of radon particles by continuously measuring, monitoring and analyzing the radon concentration.

An object of the present invention is to provide a ventilation system and a ventilation system which can ventilate indoor air according to a radon concentration and remotely control ventilation through communication with a server.

An object of the present invention is to provide a ventilation system and a ventilation system as described below.

The ventilator according to an embodiment may include a ventilation unit for ventilating indoor air, a sensing unit for measuring the radon concentration of the room air, and a control unit for controlling the ventilating unit based on the radon concentration.

Wherein the sensing unit includes a radon sensing sensor for measuring the radon concentration and a contamination detecting sensor for measuring the degree of contamination of the room air, and the control unit is operable, based on the radon concentration and the degree of contamination, The unit can be selectively controlled.

In one aspect, the ventilation unit is capable of discharging the air in the room to the outside and supplying the room air to the room.

The ventilation unit may include a heat exchanging unit for absorbing heat from the air discharged from the room to the outside and supplying the absorbed heat to the air flowing into the room from the outside.

In one side, the ventilation unit can supply outdoor air to the room without discharging the indoor air to the outside.

The ventilation system according to one embodiment includes a ventilator for ventilating the room air and a sensing device provided separately from the ventilator for measuring the radon concentration of the room air, Lt; / RTI >

On one side. The measured value of the sensing device is transmitted to an external server, and the external server can remotely control the ventilator based on the measured value.

The ventilation system according to another embodiment includes a ventilating apparatus for ventilating room air, a purifying apparatus for purifying the room air, and a sensing unit for measuring the radon concentration of the room air, wherein the ventilating apparatus or the purifying apparatus Can be controlled based on the radon concentration.

On one side, the sensing unit is included in the cleaner, and the cleaner can control the ventilator based on the radon concentration.

On one side, the sensing unit is included in the ventilator, and the ventilator can control the cleaning device based on the radon concentration.

In one aspect, the measurement value of the sensing unit is transmitted to an external server, and the external server can remotely control the ventilator or the cleaning device based on the measured value.

On one side, the ventilator or the cleaner can be selectively activated based on the radon concentration.

The ventilation system further comprises an external sensing unit for measuring the radon concentration of the outdoor air, wherein the ventilator and the purifier can be controlled based on the radon concentration of the indoor air and the indoor air have.

On one side, the cleaning device can be controlled to purge the indoor air by operating in a state in which the indoor air is discharged to the outside or the outdoor air is not supplied to the indoor.

The ventilation system according to one embodiment includes a first mode for discharging indoor air to the outside and a second mode for supplying outdoor air to the room, a second mode for supplying outdoor air to the room without discharging indoor air to the outside, And a third mode for purifying the indoor air by operating the cleaning device in a state in which the indoor air is not discharged to the outside or the outdoor air is not supplied to the room, and the mode can be controlled based on the radon concentration of the indoor air have.

According to the ventilator and the ventilating system according to an embodiment, the ventilator includes a sensing unit for sensing radon, so that the ventilator itself can detect the radon concentration and determine whether to ventilate.

According to the ventilator and the ventilating system according to the embodiment, the ventilator is configured to communicate with a separate sensing device so that the existing sensing device can be utilized to control the ventilator.

According to the ventilator and the ventilation system according to the embodiment, the ventilator and the air cleaner can actively operate according to the radon concentration.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned may be clearly understood by those skilled in the art from the following description.

1 is a view schematically showing a configuration of a ventilator according to an embodiment.
2 is a view showing a configuration of a ventilation unit according to one embodiment.
3 is a view schematically showing a configuration of a ventilation system according to an embodiment.
4 is a view schematically showing a configuration of a ventilation system according to another embodiment.

1 is a view schematically showing a configuration of a ventilator according to an embodiment.

Referring to FIG. 1, a ventilator 1 according to an embodiment may include a ventilation unit 110, a sensing unit 120, and a control unit 130. The ventilator 1 can be configured to measure the radon concentration of the indoor air in the ventilator 1 itself and to determine whether the ventilating unit 110 is operated or not.

The ventilation unit 110 can ventilate the room air. The ventilation unit 110 may include a ventilation fan, and may discharge the inside air to the outside, or may introduce outside air into the inside.

The sensing unit 120 may be disposed within the ventilator 1. The sensing unit 120 may measure the radon concentration of the room air and may include, for example, a radon sensing sensor.

Alternatively, the sensing unit 120 may include a contamination detection sensor (not shown). The contamination detection sensor measures the pollution degree of the indoor air, and may include a carbon dioxide detection sensor or a fine dust detection sensor.

For example, the contamination detection sensor can detect various kinds of volatile organic compounds (VOCs) such as fine dust concentration in space, sulfur dioxide, carbon monoxide, nitrogen dioxide, ozone, and carcinogenic substances such as formaldehyde (HCHO), toluene, benzene, (CO 2), dust, cigarette smoke, odor and microbial substances (Escherichia coli, Pseudomonas aeruginosa, 0-157, Salmonella) and volatile organic pollutants in various household products and other odors generated from asbestos , Noise, and radiation can be detected.

The sensing unit 120 may include a particle counter to calculate the amount of dust contained in the air in the room.

The control unit 130 may control the ventilation unit 110 based on the measured radon concentration at the sensing unit 120. [

For example, when the reference radon concentration is set and the radon concentration of the indoor air exceeds a predetermined value, the control unit 130 can operate the ventilation unit 110. [ Then, when the radon concentration of the indoor air falls below a predetermined value, the control unit 130 can stop the operation of the ventilation unit 110. Then, the control unit 130 can control the ventilation intensity of the ventilation unit 110. [

Then, the control unit 130, in addition to the radon concentration, can control the ventilation unit 110 in accordance with the pollutants measured in the pollution detection sensor.

For example, even if the radon concentration of the indoor air does not reach a predetermined value, the control unit 130 can operate the ventilation unit 110 when a large amount of carbon dioxide or fine dust exists.

Alternatively, the control unit 130 may calculate the ventilation index considering the radon concentration and air pollution such as carbon dioxide or fine dust, and the control unit 130 may control the ventilation unit 110 based on the ventilation index.

2 is a view showing a configuration of a ventilation unit 110 according to an embodiment.

Referring to FIG. 2, the ventilation unit 110 may include a housing 111 constituting a body. An external air outlet 113a and an external air inlet 113b are formed on one side of the housing 111 and an internal air outlet 112a and an internal air inlet 112b may be formed on the other side of the housing 111. [ An exhaust fan (not shown) may be formed in each of the outlets 112a and 113a or the inlets 112b and 113b.

The ventilation unit 110 can reduce the radon concentration of air in the room by discharging the air in the room having a high radon concentration to the outside, or by introducing air out of the room to pressurize the room.

For example, the indoor air can be discharged to the outside through the external air outlet 113a through the internal air inlet 112b and the external air can be discharged through the external air inlet 113b to the internal air outlet 112a And can be supplied indoors.

Alternatively, the ventilation unit 110 can discharge the air in the room to the outside and supply the room outside air to the room. The ventilation unit 110 may include a heat exchange unit 114 disposed at an intersection of the indoor air and the outdoor air.

For example, the heat exchange unit 114 may include a heat exchange element, and may absorb heat from the air discharged from the room to the outside of the room and supply the heat absorbed to the air flowing into the room from the outside. Accordingly, it is possible to reduce the temperature difference between the outdoor air flowing into the room and the existing indoor air.

Alternatively, the ventilation unit 110 can supply outdoor air to the room without discharging indoor air to the outside.

For example, the operation of the exhaust fan that sends indoor air to the outside may be interrupted, or the indoor air inlet 112b or the outdoor air outlet 113a may be blocked so that the indoor air is not discharged to the outside. In this state, the ventilation unit 110 can supply outdoor air to the room.

With this configuration, the ventilation unit 110 can raise the room pressure to lower the radon concentration, and by applying the positive pressure to the room, the radon generated in the gap can be prevented from flowing into the room.

The operating speed of the exhaust fan can be controlled by the radon concentration of the room air, the carbon dioxide concentration, and the like. That is, the higher the radon concentration, the faster the exhaust fan can operate, and the lower the radon concentration, the slower the exhaust fan can operate.

3 is a view schematically showing a configuration of a ventilation system according to an embodiment.

Referring to FIG. 3, the ventilation system 2 may include a ventilation device 210 and a sensing device 220. The sensing device 220 may be provided separately from the ventilator 210. For example, the sensing device 220 may be a separate radon sensing device from the ventilator 210.

The sensing device 220 may measure the radon concentration of the indoor air. The sensing device 220 may measure carbon dioxide, fine dust concentration, and the like. The sensing device 220 may be configured similar to the sensing unit described above.

The sensing device 220 and the ventilator 210 each include a communication unit (not shown), and the ventilator 210 can receive the measured value of the sensing device 210 and start or stop the ventilation of the indoor air . Alternatively, the sensing device 220 may send a control signal to the ventilator 210 based on the measured radon concentration to start or stop ventilation.

The ventilation system 2 can be controlled by an external server.

The measured value of the sensing device 220 may be transmitted to an external server and the external server may control the sensing device 220 or the ventilator 210 based on the measured value. The external server may communicate with the sensing device 220 or the ventilator 210 through the communication unit of the sensing device 220 or the communication unit of the ventilator 210.

Then, the states of the sensing device 220 and the ventilator 210 are transmitted to the external server, and the external server can control the operation of the ventilating system 2 based on this.

For example, the external server may set the detection mode such as the radon concentration sensing period, sensitivity of the sensing device 220, carbon dioxide, and fine dust concentration detection. Then, the external server can remotely activate or deactivate the ventilation device 210.

Through this configuration, the external server can grasp the indoor air condition and the state of the ventilation system 2, and can control the ventilation system 2 remotely.

The server may be connected to a personal PC or a smart phone to provide information of the ventilation system 2 to the user. The user may also control the ventilation system 2 through a personal computer or a smart phone.

4 is a view schematically showing a configuration of a ventilation system according to another embodiment. 4A shows a configuration in which the sensing unit 320a is included in the ventilator 310 and FIG. 4B shows a configuration in which the sensing unit 320b is included in the cleaning device 350. FIG.

Hereinafter, the components included in the above embodiments and the components including the common functions will be described using the same names. Unless otherwise stated, the description of the above embodiment can be applied to the following embodiments. A detailed description will be omitted below.

Referring to Figures 4A and 4B, the ventilation system 3 may include a cleaning device 350. The cleaning device 350 may include an air purifier for purifying the air in the room.

The sensing units 320a and 320b may be included in the ventilator 310 or the cleaner 350. [ The ventilator 310 or the purifier 350 can then be controlled based on the radon concentration measured at the sensing units 320a and 320b.

The ventilator 310 and the cleaner 350 may each include a communication unit to transmit and receive control signals to each other.

For example, the sensing unit 320a may be included in the cleaning device 350 and the cleaning device 350 may control the ventilator 310 based on the measured radon concentration. That is, when the cleaning device 350 senses a radon concentration of a predetermined reference value or more, the cleaning device 350 can operate the ventilator 310.

Alternatively, the sensing unit 320b may be included in the ventilator 310, and the ventilator 310 may operate the cleaner 350 based on the measured radon concentration.

The ventilator 310 or the cleaner 350 may be selectively activated based on the measured radon concentration.

For example, a reference value that determines the operation of the ventilator 310 or the cleaning device 350 may be set. If the measured radon concentration is equal to or higher than the reference value, the ventilator 310 is operated, and if the measured value is lower than the reference value, the cleaning device 350 can be operated.

Alternatively, the ventilation device 310 or the cleaning device 350 may all be operated according to the reference value. Of course, the ventilator 310 or the purifier 350 can be operated in consideration of the pollutants other than the radon concentration.

For example, if the indoor radon concentration is sufficiently low, the operation of the ventilator 310 may be interrupted and only the cleaning device 350 may be activated. That is, the cleaning device 350 can operate in a state in which the indoor air is not discharged to the outside or the outdoor air is not supplied to the indoor space, thereby purifying the indoor air.

When only the cleaning device 350 is operated, air can not flow in and out of the room, and the temperature of the room air can be maintained. The cleaning device 350 can manage the radon, fine dust, VOC, etc. of the indoor air, and the operation of the cleaning device 350 can be controlled by the radon concentration or the like.

In addition, the ventilation system 3 may include an external sensing unit (not shown) for measuring the radon concentration of the outdoor air. The ventilation system 3 can control the operation of the ventilator 310 and the cleaning device 350 based on the radon concentration difference of the outdoor air and the indoor air.

For example, if the radon concentration of the outdoor air is higher than the radon concentration of the indoor air, the ventilation system 3 can operate the cleaning device 350. Conversely, if the radon concentration of the indoor air is higher than the radon concentration of the outdoor air, the ventilation system 3 can operate the ventilator 310. That is, the ventilation system 3 can efficiently reduce the radon concentration by selectively controlling the ventilator 310 or the cleaning device 350 based on the radon concentration.

The measured value of the sensing unit 320 is then transmitted to the external server and the external server can remotely control the ventilator 310 or the cleaner 350 based on the measured value.

5 is a flowchart showing an operation mode of a control system of a ventilation system according to an embodiment.

Referring to Figure 5, the ventilation system may provide a plurality of modes of operation based on the radon concentration.

In the first mode, indoor air can be discharged outdoors, and outdoor air can be supplied to the room. The ventilating apparatus can operate both a ventilating fan for introducing the air into the room and a ventilating fan for discharging the air to the outside.

For example, the first mode may be used when the indoor radiant concentration of the indoor air is higher than the outdoor air and the outdoor air needs to be introduced indoors. As the ventilation device, a heat exchange type ventilation system can be used, and the degree of ventilation can be controlled according to the indoor radon concentration, the carbon dioxide concentration and the like.

In the second mode, outdoor air can be supplied to the room without discharging the indoor air to the outdoor. The ventilation device can operate the ventilation fan for stopping the operation of the ventilation fan for introducing the air into the room and discharging the air outdoors.

For example, in the second mode, indoor air pressure is increased by supplying outdoor air to the interior, thereby lowering the radon concentration. In addition, by applying a positive pressure to the room, radon generated in the gap can be prevented from flowing into the room.

The degree of supply of outdoor air can be controlled based on the radon concentration, the carbon dioxide concentration, and the like.

In the third mode, indoor / outdoor air flow is blocked, and room air can be circulated. The ventilation device can stop the operation of the ventilation fan for introducing the air into the room and the ventilation fan for discharging the air outdoors. And, in a state in which the ventilator does not discharge the indoor air to the outside or supply the outdoor air to the room, the cleaning device can purify the indoor air.

For example, the third mode can be used when the indoor radon concentration is sufficiently low. In the third mode, the flow of indoor / outdoor air is blocked and the indoor air can be circulated. Then, the cleaning unit is operated to purify the indoor air.

In the third mode, indoor air is maintained, and radon, fine dust, VOC and the like of the room air can be purified, and the degree of cleanliness can be controlled based on radon, fine dust, VOC and the like. The operating modes described above are illustrative, and the ventilation system may include additional modes, or may be operated only in some of the illustrated modes.

According to the ventilator and the ventilation system described above, the ventilator includes a sensing unit for sensing the radon, so that the ventilator itself can detect the radon concentration to determine whether the ventilator is ventilated, or the ventilator communicates with a separate sensing device The ventilation device can be controlled using the existing sensing device, and the ventilation device and the air cleaning device can actively operate according to the radon concentration.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments and equivalents to the claims are within the scope of the following claims.

110 Ventilation unit
120 sensing unit
130 control unit

Claims (15)

A ventilation unit for ventilating indoor air;
A sensing unit for measuring a radon concentration of the indoor air; And
And a control unit for controlling the ventilation unit based on the radon concentration.
The method according to claim 1,
The sensing unit includes:
A radon sensor for measuring the radon concentration; And
And a pollution detection sensor for measuring the pollution degree of the indoor air,
Wherein the control unit selectively controls the ventilation unit based on the radon concentration and the pollution degree.
The method according to claim 1,
Wherein the ventilation unit discharges the air in the room outdoors and supplies the outdoor air to the room.
The method of claim 3,
Wherein the ventilation unit includes a heat exchange unit that absorbs heat from the air discharged from the room to the outside and supplies the absorbed heat to the air flowing into the room from the outside.
The method according to claim 1,
Wherein the ventilation unit supplies outdoor air to the room without discharging the indoor air to the outside.
A ventilation device for ventilating indoor air; And
And a sensing device provided separately from the ventilator for measuring a radon concentration of the indoor air,
Wherein the ventilator is controlled based on the radon concentration.
The method according to claim 6,
The measured value of the sensing device is transmitted to an external server,
Wherein the external server is capable of remotely controlling the ventilator based on the measured value.
A ventilation device for ventilating indoor air;
A cleaning device for purifying the indoor air; And
And a sensing unit for measuring a radon concentration of the indoor air,
Wherein the ventilator or the purifier is controlled based on the radon concentration.
9. The method of claim 8,
Wherein the sensing unit is included in the cleaning device,
Wherein the cleaning device is capable of controlling the ventilator based on the radon concentration.
9. The method of claim 8,
Wherein the sensing unit is included in the ventilator,
Wherein the ventilator is capable of controlling the cleaning device based on the radon concentration.
9. The method of claim 8,
The measured value of the sensing unit is transmitted to an external server,
Wherein the external server is capable of remotely controlling the ventilator or the purifier based on the measured value.
9. The method of claim 8,
Wherein the ventilator or the purifier is selectively activated based on the radon concentration.
9. The method of claim 8,
Further comprising an external sensing unit for measuring the radon concentration of the outdoor air,
Wherein the ventilator and the purifier are controlled based on a radon concentration of the indoor air and the indoor air.
9. The method of claim 8,
Wherein the cleaning device is operable in a state in which indoor air is not discharged outdoors or outdoor air is not supplied to the indoor so that indoor air can be controlled to be purified.
A first mode for discharging indoor air to the outside and supplying outdoor air to the indoor;
A second mode for supplying outdoor air to the room without discharging indoor air to the outside; And
And a third mode for purifying the indoor air by operating the cleaning device in a state in which indoor air is not discharged outdoors or outdoor air is not supplied to the indoor,
Wherein the mode is controlled based on the radon concentration of the indoor air.
KR1020150187877A 2015-12-28 2015-12-28 Ventilating device and system KR20170089046A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190106608A (en) * 2018-03-06 2019-09-18 동서콘트롤(주) Integrated air conditioning control system
KR20200021785A (en) * 2018-08-21 2020-03-02 대우조선해양 주식회사 Fan control system capable of monitoring dust concentration
KR102206134B1 (en) * 2020-06-09 2021-01-22 에어시스템 주식회사 Method for operating of air conditioning system based on environment information and air conditioning device for performing the method
KR20210029608A (en) * 2019-09-06 2021-03-16 주식회사 이지네트웍스 A Usage Situation Adaptive Air Cleaning System and An Operating Method thereof
WO2021117946A1 (en) * 2019-12-12 2021-06-17 (주)대우루컴즈 Air purifier
KR102325618B1 (en) * 2021-02-02 2021-11-15 주식회사 에이피씨테크 Photocatalytic reaction air purification heat exchange ventilator

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190106608A (en) * 2018-03-06 2019-09-18 동서콘트롤(주) Integrated air conditioning control system
KR20200021785A (en) * 2018-08-21 2020-03-02 대우조선해양 주식회사 Fan control system capable of monitoring dust concentration
KR20210029608A (en) * 2019-09-06 2021-03-16 주식회사 이지네트웍스 A Usage Situation Adaptive Air Cleaning System and An Operating Method thereof
WO2021117946A1 (en) * 2019-12-12 2021-06-17 (주)대우루컴즈 Air purifier
KR20210074859A (en) * 2019-12-12 2021-06-22 (주)대우루컴즈 Air purifier
KR102206134B1 (en) * 2020-06-09 2021-01-22 에어시스템 주식회사 Method for operating of air conditioning system based on environment information and air conditioning device for performing the method
KR102325618B1 (en) * 2021-02-02 2021-11-15 주식회사 에이피씨테크 Photocatalytic reaction air purification heat exchange ventilator

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