KR101426733B1 - heat exchanging air conditioner for cycling recycle heat and its control method - Google Patents

Abstract

The present invention is to provide a heat exchange air conditioner for waste heat recovery which uses waste heat of indoor air exhausted during ventilation in heating introduced outdoor air to reduce a heat source of an air conditioner, and a method for controlling thereof. The heat exchange air conditioner for waste heat recovery comprises a ventilation duct in which a ventilation unit and an air supply unit are formed to enable air to flow in an inner passage; a sensor unit provided inside the ventilation duct to detect a condition and an air volume of outdoor air introduced from the air outside and indoor air exhausted from indoor, and installed at an entrance door to detect a number of people inside a building; first and second introduction pipes provided inside the ventilation duct to introduce the outdoor air introduced from the air outside to indoor; first and second exhaust pipes provided inside the ventilation duct to exhaust the indoor air ventilated from indoor; a heat exchanger for waste heat recovery connected to the second introduction pipe and the second exhaust pipe to recover waste heat of the indoor air exhausted during ventilation and to provide the waste heat as a heat source for introduced (or discharged) outdoor (or indoor) air; and a damper which controls opening/closing of the first and second introduction pipes and the first and second exhaust pipes based on the number of people inside, an indoor pollution level, and a volume of air introduced indoors.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange air conditioner for waste heat recovery,

The present invention relates to a waste heat recovery heat exchange air-conditioning apparatus and a control method thereof, and more particularly, to a waste heat recovery heat exchange air-conditioning apparatus and a control method thereof for reducing heat source of an air conditioning apparatus by using waste heat of air exhausted during ventilation.

Background Art [0002] Generally, an air conditioner refers to an apparatus and a system for providing air necessary for a building and a factory having a certain space. In other words, an air conditioner is also called an air conditioner, and a certain space is controlled by temperature, humidity, and air flow suitable for human activity, and at the same time, dust and the like in the air are removed. At this time, the comfortable room temperature is subtly due to the human senses, but in summer, the outside temperature and the temperature difference are about 5 ~ 6 ℃, the room temperature is 25 ~ 29 ℃, the humidity is 60 ~ 70% ~ 21 ℃, humidity is about 55 ~ 70% is good.

Such an air conditioning apparatus not only supplies outside air to the inside, but also various pumps, a plurality of heat exchangers, and various auxiliary equipments are required to keep the temperature of the air supplied to the inside constant.

However, such an air conditioner requires a boiler for providing a heat source supplied to the heat exchanger, which causes a problem in that the operation cost is high and the maintenance is economically difficult.

In particular, in the winter season, the room temperature becomes higher than the outside temperature due to heating, etc. In this case, in order to purify the room air, the room air is exhausted to the outside, and when the outdoor air is introduced into the room, And the cold outdoor air flows into the inside. Accordingly, the heat source of the exhausted indoor air is discarded as it is, and the inflowing outdoor air must be kept warm through the heating or the like again, resulting in a problem that the energy efficiency is lowered during ventilation through the air conditioner.

Patent Registration No. 10-1061884: Air conditioner and outdoor unit of air conditioner Patent Registration No. 10-0129244: Air conditioner

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a waste heat recovery heat exchange apparatus and a waste heat recovery heat exchange apparatus which can reduce waste heat of indoor air discharged during ventilation, And a control method thereof.

Other objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a heat exchange air-conditioning apparatus for recovering waste heat, comprising: a ventilation duct having a ventilation part and an air supply part for allowing air to flow in the interior of the ventilation duct; A sensor unit installed in the door to detect the number of occupants in the building, and a sensor unit installed in the ventilation duct to introduce outdoor air introduced through the outside air into the room. The sensor unit detects the state and the air volume of the outdoor air and the indoor air exhausted from the room, A second exhaust pipe provided in the ventilation duct for exhausting indoor air to be ventilated to the room, and a second indoor unit connected to the second indoor air inlet pipe and the second indoor air duct to discharge indoor air (Or indoor) air recovered from the waste heat recovered by the waste heat recovery heat exchanger and provided as a heat source to the outdoor (or indoor) And a damper for controlling the open / close of the exhaust pipe based on indoor personnel, indoor pollution degree, and air volume flowing into the indoor space.

Preferably, the sensor unit includes a temperature sensor (TD) disposed inside the ventilation duct for sensing the temperature of outdoor air and indoor air, a pollution degree sensor (CO) disposed in the ventilation duct for sensing the pollution degree and humidity of outdoor air and indoor air, ₂ ) and a humidity sensor (HD), an earthquake ground sensor (SD) provided in the ventilation duct for sensing smoke in the waste heat recovery heat exchange air conditioner, And an infrared sensor for counting the number of passengers entering and exiting the building to check the number of passengers in the building.

Preferably, the waste heat recovery heat exchanger / air conditioner is configured to proportionally control the bypass damper on the outdoor side based on indoor personnel information when the indoor pollution degree detected through the pollution level sensor (CO ₂ ) is 400 ppm or more and 700 ppm or less, (First M) on the basis of indoor pollution information irrespective of indoor personnel information when the sensed degree of indoor pollution exceeds 700 ppm, and controls the flow rate to be introduced into the room by proportionally controlling the bypass damper And a control unit.

According to another aspect of the present invention, there is provided a control method for a heat exchange air-conditioning apparatus for recovering waste heat, the method comprising: (A) operating an air conditioner to maintain a room temperature and a room humidity constant through warm-up control, (B) detecting indoor pollution degree detected by the installed pollution level sensor (CO2), and (B) calculating the indoor air pollution degree calculated by adding the detected indoor pollution degree to at least one of the indoor number and the occupied area (C) when the season is a seasonal change, the detected indoor pollution level is calculated by summing with the indoor number of people and the occupied area, And performing the bypass air conditioning without passing through the recovery exchange.

Preferably, the step (B) includes the steps of closing both the waste heat damper and the bypass damper, controlling the ventilation damper in the ventilation duct to be open and performing the air conditioning if the detected degree of indoor pollution is less than 400 ppm, If the degree of indoor pollution is 400 ppm or more and 700 ppm or less, the waste heat damper is proportionally controlled based on the indoor number of people and the occupied area together with the degree of indoor pollution, the air volume is introduced into the room, the bypass damper is closed, And performing the air conditioning by performing reverse control so as to inversely control the amount of air flowing into the room. When the detected degree of indoor pollution exceeds 700 ppm, the waste heat damper is proportionally controlled The air damper is introduced into the room, the bypass damper is closed, and the ventilation damper in the ventilation duct is inversely operated so as to be inversely proportional to the amount of air flowing into the room And a second heat exchanger for recovering waste heat of indoor air exhausted through the waste heat recovery heat exchanger through the second inlet pipe and the second exhaust pipe through proportional control of the waste heat damper, The method comprising the steps of:

Preferably, the step (C) includes the steps of closing both the waste heat damper and the bypass damper, controlling the ventilation damper in the ventilation duct to be open and performing the air conditioning if the detected indoor pollution degree is less than 400 ppm, If the degree of indoor pollution is 400 ppm or more and 700 ppm or less, the bypass damper is proportionally controlled based on the indoor number of persons and the occupied area together with the degree of indoor pollution, the air volume is introduced into the room, the waste heat damper is closed and the ventilation damper And controlling the bypass damper to be proportional control based on only indoor pollution regardless of the number of indoor people when the detected indoor pollution degree exceeds 700 ppm. , The waste heat damper is closed, and the ventilation damper in the ventilation duct is openly controlled by the reverse operation so that the amount of air flowing into the room is inversely proportional, Including the step of performing is characterized in that formed.

Preferably, the method further comprises the steps of: calculating a required ventilation amount per person for the number of people in the room; counting the number of people entering and exiting the building through a sensor installed in the door; Calculating a necessary ventilation amount using the calculated required ventilation amount per person and the number of occupants per room based on the occupied area, detecting air turbidity in the room by a pollution level sensor (CO 2) installed in the ventilation duct, And estimating an inflow amount of air by summing the detected indoor air pollution degree and the inflow air based on the calculated required ventilation amount.

As described above, the waste heat recovery heat exchanger and its control method according to the present invention uses the waste heat of the room air discharged during ventilation to heat the outdoor air, thereby significantly increasing the heating efficiency of the air conditioner There is an economical effect that the cost of operation and maintenance can be reduced.

1 is a configuration diagram showing a configuration of a heat exchange air-conditioning apparatus for recovering waste heat according to an embodiment of the present invention
2 is a flowchart for explaining a control method of a waste heat recovery heat exchange air conditioning apparatus according to an embodiment of the present invention.
3 is a flow chart for explaining a control method cooperated through the waste heat recovery heat exchanger of FIG. 2 in detail;

Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

Preferred embodiments of a waste heat recovery heat exchange air-conditioning apparatus and a control method thereof according to the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to let you know. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

1 is a block diagram showing a configuration of a heat exchange air-conditioning apparatus for recovering waste heat according to an embodiment of the present invention.

As shown in FIG. 1, the waste heat recovering heat exchange air conditioning system of the present invention includes a ventilation duct 100 having a ventilation part and an air supply part so that air can flow in the inside of the ventilation duct 100, A sensor unit installed in the ventilation duct 100 for detecting the state and volume of the room air discharged from the outside air and the room air discharged from the room, First and second exhaust pipes 310 and 320 for introducing outdoor air into the room and first and second exhaust pipes 410 and 420 for exhausting indoor air to be ventilated to the room, (Or indoor) air that is connected to the second inlet pipe 320 and the second exhaust pipe 420 to recover waste heat of indoor air exhausted during ventilation and to introduce A waste heat recovery heat exchanger 200, A damper for controlling the open / close of the first and second inlet pipes 310 and 320 and the first and second exhaust pipes 410 and 420 based on indoor personnel, indoor pollution degree, (First M, third M) (second M, fourth M).

At this time, the sensor unit includes a temperature sensor (TD) provided inside the ventilation duct for sensing the temperature of the outdoor air and the room air, a pollution degree sensor (CO) disposed in the ventilation duct for sensing the pollution degree and humidity of the outdoor air and the indoor air, ₂ ) and a humidity sensor (HD), a groundwater level sensor (SD) provided in the ventilation duct for sensing smoke in the waste heat recovery heat exchange air conditioner, and air volume information An air flow sensor (FMS) for checking the inflow amount of air through the door, and an infrared sensor for counting the number of people entering and exiting the building to check the number of rooms in the building.

On the other hand, when the indoor pollution degree detected through the pollution level sensor (CO ₂ ) through the control unit (not shown) is 400 ppm or more and 700 ppm or less, the bypass heat exchanger (1M) is proportionally controlled to flow air into the room, and when the degree of indoor pollution detected by the pollution level sensor (CO2) exceeds 700 ppm, the bypass damper (First M) is proportionally controlled to introduce the air flow into the room.

The operation of the waste heat recovery heat exchanger according to the present invention will now be described with reference to the drawings. The same reference numerals as those in Fig. 1 designate the same members performing the same function.

2 is a flowchart illustrating a method of controlling a waste heat recovery heat exchange air conditioning apparatus according to an embodiment of the present invention.

2, first, the air conditioner is operated to maintain the room temperature and the indoor humidity constant through the warm-up control, and then the degree of indoor pollution detected through the pollution level sensor (CO2) installed in the ventilation duct is detected ).

In the case where the season is the winter season (S102), the indoor air is warm and the outdoor air is cold, so that air conditioning is performed through the waste heat recovery exchanger 200.

Therefore, when the degree of indoor pollution detected in the winter season is less than 400 ppm (S103), it is determined that the pollution degree of indoor air is not high. Therefore, the waste heat damper (third M) (fourth M) and the bypass damper And closes the ventilation damper M so that the ventilation damper M in the ventilation duct 100 is opened and performs air conditioning (S104).

(S103), the waste heat damper (3M) (4M) is proportionally controlled based on the indoor number of people and the occupied area together with the degree of indoor pollution, so that the indoor airflow rate Lt; / RTI > Then, the bypass damper (first M) (second M) closes, and the ventilation damper M in the ventilation duct 100 is inversely operated so as to be inversely proportional to the amount of air flowing into the room, ). The number of people in the room can be calculated by counting the number of people entering and leaving the building through a sensor or the like installed in a door or the like to calculate the number of rooms in the building. That is, the number of people entering the building can be easily added by subtracting the number of people who enter the building and the number of people who go outside the building. In addition, a method of setting the amount of air flowing into the room based on the number of occupants and the occupied area will be described in detail below.

If the indoor pollution degree detected in the winter season is more than 700 ppm (S103), it is determined that the indoor air pollution degree is very high. Therefore, the waste heat damper (3M) ) Is proportionally controlled to introduce air into the room. Then, the bypass damper (first M) (second M) closes, and the ventilation damper M in the ventilation duct 100 is inversely operated so as to be in inverse proportion to the amount of air flowing into the room, ).

The waste heat of the indoor air exhausted through the waste heat recovery heat exchanger 200 through the second inlet pipe 320 and the second exhaust pipe 420 through proportional control of the waste heat damper (3M) (4M) And supplies the extracted outdoor air to the heat source (S107).

In the case of the summer season, the indoor air is cold and the outdoor air is warm, so that the damper in the air conditioner is controlled (1M to 4M) similarly to the winter season. In this case, the waste heat of the indoor air It should be noted that it means air.

On the other hand, if the season is a season (S102), the temperature of the indoor air and the outdoor air are similar to each other, so bypass conditioning is performed not through the waste heat recovery exchanger 200. [

Accordingly, when the detected indoor pollution degree is less than 400 ppm (S108), it is determined that the indoor air pollution degree is not high. Therefore, the waste heat damper (third M) (fourth M) and the bypass damper (first M) And the ventilation damper M in the ventilation duct 100 is opened to perform air conditioning (S109).

If the degree of indoor pollution detected in the case of a seasonal change is not less than 400 ppm and not more than 700 ppm (S108), the bypass damper (first M) (second M) is proportionally controlled based on the indoor number of people and the occupied area together with the degree of indoor pollution, Lt; / RTI > The ventilation damper M in the ventilation duct 100 is inversely operated so as to be inversely proportional to the amount of air flowing into the room, and performs air conditioning (S110) . Similarly, the number of people in the room can be calculated by counting the number of people entering and leaving the building through a sensor or the like installed on a door or the like, thereby calculating the number of rooms in the building. That is, the number of people entering the building can be easily added by subtracting the number of people who enter the building and the number of people who go outside the building. In addition, a method of setting the amount of air flowing into the room based on the number of occupants and the occupied area will be described in detail below.

If the detected degree of indoor pollution exceeds 700 ppm (S103), it is determined that the degree of contamination of the indoor air is very high. Therefore, the bypass damper (first M) ) Is proportionally controlled to introduce airflow into the room. Then, the waste heat damper 3M (fourth M) is closed and the ventilation damper M in the ventilation duct 100 is inversely operated so as to be inversely proportional to the amount of air flowing into the room (S111).

A method for setting the amount of air flowing into the room based on the number of occupants and occupied area is as follows.

First, the amount of ventilation by the number of occupants is calculated by calculating the required ventilation amount per capita for the specified number of occupants in the case where the number of occupants in the design drawing is specified, as shown in the following equation (1).

As shown in the above Equation 1, the required ventilation amount per person is the ventilation amount for removing the amount of CO ₂ generated by one occupant, and the ventilation amount is 20 to 40 CMH.

Generation (adult) Carbon dioxide removal
Required air volume Design 1 person
Required air volume M3 / h CMH
(Based on outdoor air 300ppm) CMH
(Based on outdoor air 300ppm) Rest 0.0110 16 Office (bottom) 0.0129 18 20 Office 0.0180 26 25 Light work 0.0230 33 35 Middle work 0.0300 43 40

The following equation (2) is a method for calculating the amount of ventilation by the occupied area per person. When the number of occupants is not specified on the design drawing, the occupancy number per capita defined in the architectural design data collection is used to calculate the occupancy number And the necessary ventilation amount is calculated by adding the necessary ventilation amount per person.

Through this, the number of people entering and leaving the building through the sensor installed in the entrance door is counted, and the necessary ventilation amount is calculated by the number of occupants in the building and the occupied area. Then, air turbidity of the room is detected by a pollution level sensor (CO 2) installed in the ventilation duct 100, and the amount of air to be infused is calculated by calculating the amount of ventilation by summing with the air introduced based on the calculated amount of ventilation.

In addition, when the smoke sensor detects the smoke sensor SS installed on the ventilation duct 100, the mode is switched to the ventilation mode. The ventilation mode includes an operation of starting and stopping the air supply fan and the ventilation fan in response to a start / stop signal of the air supply fan, the air supply fan, and the ventilation fan. Accordingly, when the air supply fan is stopped, the ventilation fan is turned off, the air conditioning valve is closed, the humidifier is turned off, the ventilation damper in the heat exchanger 200 for heat recovery is opened and all the dampers (first to fourth) The first and second inlet pipes 310 and 320 and the first and second exhaust pipes 410 and 420 are closed.

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. It will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (8)

A ventilation duct 100 having a ventilation inlet through which indoor air flows into the indoor space so that the indoor air can flow in the indoor space,
A sensor unit installed in the ventilation duct to detect the state and the air volume of the outdoor air introduced from the outside air and the indoor air exhausted from the room and to detect the number of occupants in the building installed in the door,
A first and a second inflow pipe (100) for introducing the outdoor air into the ventilation duct (100) so that the outdoor air flowing through the outside air, not the indoor air flowing into the ventilation inlet, is discharged to the room through the ventilation air supply mechanism 310) 320,
First and second exhaust pipes 410 and 420 for discharging indoor air introduced through the ventilation inlet to the outside,
(Or indoor) air that is connected to the second inlet pipe 320 and the second exhaust pipe 420 to recover the waste heat of indoor air exhausted at the time of ventilation and to provide outdoor (or indoor) A heat exchanger 200,
The amount of opening of the ventilation duct 100, the first and second inflow pipes 310 and 320 and the first and second exhaust pipes 410 and 420 is calculated based on indoor personnel, indoor air pollution, And a damper section for controlling the damper section,
The heat exchanger (200) is placed in the second inlet pipe (320) and the second exhaust pipe (420)
The first inlet pipe 310 is connected to the second inlet pipe 320 in parallel so that the outdoor air flowing into the second inlet pipe 320 is bypassed without passing through the heat exchanger 200,
The first exhaust pipe 410 is connected to the second exhaust pipe 420 in parallel so that the indoor air discharged to the second exhaust pipe 420 is bypassed without passing through the heat exchanger 200,
In the damper portion,
A first waste heat damper (3M) provided at a front end of the heat exchanger (200) with respect to an inflow direction of the outdoor air among the second inflow pipe (320) and controlling an opening amount of the second inflow pipe (320) )Wow,
A second waste heat damper (4M) provided at a front end of the heat exchanger (200) with respect to an outflow direction of the indoor air of the second exhaust pipe (420) to regulate the amount of opening of the second exhaust pipe (420) ,
A first bypass damper (first M) provided in the first inlet pipe 310 to adjust the amount of opening of the first inlet pipe 310,
A second bypass damper (second M) provided in the first exhaust pipe 410 to adjust the amount of opening of the first exhaust pipe 410, and
A ventilation damper M provided between the second inlet pipe 320 and the second exhaust pipe 420 of the ventilation duct 100 to adjust the amount of opening of the ventilation duct 100,
And a heat exchanger for heating the waste heat. The apparatus of claim 1, wherein the sensor unit
A temperature sensor (TD) provided in the ventilation duct to sense the temperature of the outdoor air and the indoor air,
A pollution level sensor (CO ₂ ) and a humidity level sensor (HD) provided in the ventilation duct to sense pollution degree and humidity of outdoor air and indoor air,
(SD) provided in the ventilation duct to sense smoke in the ventilation duct,
An air flow sensor (FMS) provided in the second inlet pipe for checking an inflow amount of air through air volume information flowing into the room from the outside air side,
And an infrared sensor provided in the door for counting the number of people entering and exiting the building to check the number of people in the building. The waste heat recovery heat exchanger according to claim 2, wherein the waste heat recovery heat exchanger
If the degree of indoor pollution detected through the pollution level sensor (CO ₂ ) is 400 ppm or more and 700 ppm or less, the first bypass damper on the outside air side is proportionally controlled based on indoor occupant information to inflow air into the room, And controlling the first bypass damper (first M) proportional to the outside air based on the indoor pollution information to control the amount of the air flow into the room irrespective of the occupant information, when the degree of indoor pollution exceeds 700 ppm And the heat exchanging unit is configured to heat the waste heat. A method for controlling a waste heat recovery heat exchange air conditioning system according to claim 1,
(A) operating the waste heat recovering heat exchange air conditioner to maintain indoor temperature and indoor humidity constant through warm-up control, and then detecting the degree of indoor pollution detected through the pollution level sensor (CO2) installed in the ventilation duct Step,
(B) performing air conditioning through the waste heat recovery heat exchanger on the basis of the inflow amount of air calculated by summing the detected indoor pollution degree with at least one of the indoor number of people and the occupied area when the season is in the summer,
(C) performing a bypass air conditioning operation not through the waste heat recovery heat exchanger based on the calculated inflow amount of the air, which is calculated by summing the detected indoor pollution degree with at least one of the indoor number of occupants and occupied area And a control unit for controlling the heat exchange air-conditioning unit. 5. The method of claim 4, wherein step (B)
If the detected degree of indoor pollution is less than 400 ppm, both the first and second waste heat dampers and the first and second bypass dampers are closed to control the ventilation damper in the ventilation duct to be opened, and air conditioning is performed , ≪ / RTI &
If the detected degree of indoor pollution is 400 ppm or more and 700 ppm or less, the first and second waste heat dampers are proportionally controlled based on the indoor number of people and the occupied area together with the indoor pollution degree to introduce the air volume into the room, Closing the bypass damper and opening the ventilation damper in the ventilation duct in a reverse operation such that the airflow is inversely proportional to the amount of air flowing into the room,
When the detected degree of indoor pollution exceeds 700 ppm, the first and second waste heat dampers are proportionally controlled based on indoor pollution only irrespective of the number of indoor people, Controlling the ventilation damper in the ventilation duct by reverse operation such that the ventilation damper is inversely proportional to the amount of air flowing into the room,
The waste heat recovered from the indoor air exhausted through the waste heat recovery heat exchanger through the second inlet pipe and the second exhaust pipe through the proportional control of the first and second waste heat dampers is provided to the outdoor air to be introduced as a heat source And a control unit for controlling the heat exchanging unit. 5. The method of claim 4, wherein step (C)
If the detected degree of indoor pollution is less than 400 ppm, both the first and second waste heat dampers and the first and second bypass dampers are closed to control the ventilation damper in the ventilation duct to be opened, and air conditioning is performed , ≪ / RTI &
The first and second bypass dampers are proportionally controlled based on the indoor number of occupants and the occupied area together with the degree of indoor pollution so that the air volume is introduced into the room when the detected degree of indoor pollution is 400 ppm or more and 700 ppm or less, 2) closing the ventilation damper, closing the ventilation damper, performing open control of the ventilation damper by reverse operation so that the ventilation damper is inversely proportional to the amount of air flowing into the room,
When the detected degree of indoor pollution exceeds 700 ppm, the first and second bypass dampers are proportionally controlled based on the degree of indoor pollution irrespective of the number of people in the room to introduce the airflow into the room, and the first and second waste heat damper And controlling the ventilation damper in an inverse operation such that the ventilation damper in the ventilation duct is inversely proportional to the amount of air flowing into the room and performing the air conditioning. . The method according to claim 5 or 6,
Wherein the number of indoor people counts the number of people entering and exiting the building through an infrared sensor installed in the door, and calculating the number of people in the building. The method according to claim 5 or 6, wherein the method for setting the incoming air volume comprises:
Calculating a required amount of ventilation per capita for the number of occupants,
Counting the number of persons entering and leaving the building through an infrared sensor installed in the door, calculating the number of rooms in the building,
Calculating a required ventilation amount by using the calculated required ventilation amount per person and the number of occupants in the room based on the occupied area;
Detecting air turbidity of the room by the pollution level sensor (CO2) installed in the ventilation duct,
And calculating an inflow amount of the air by summing the indoor air pollution degree and the air introduced based on the calculated required ventilation amount.

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