KR100519308B1 - Method for controlling airflow volume of ventilating system - Google Patents

Abstract

The present invention relates to a method for controlling the air volume of a ventilation system to improve the ventilation efficiency by correcting the air volume of the fan in response to a sudden change in the carbon dioxide (CO ₂ ) concentration in the ventilation system, the current CO ₂ concentration value and per unit time CO obtaining a _{concentration} variation; divided by the calculated CO ₂ concentration variation with the plurality of steps; as compared with the divided by the detected CO ₂ concentration value and a plurality of steps based on the concentration value determining a level of CO ₂ concentration comparing the change amount reference value by determining the level of CO ₂ concentration change; and a step of controlling the drive strength of the air supply fan and the exhaust fan using a CO ₂ concentration level and the CO ₂ concentration level variation.

Description

Method for controlling airflow volume of ventilating system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly, to a method for controlling air volume of a ventilation system having improved ventilation efficiency by correcting a fan volume in response to a sudden change in carbon dioxide (CO ₂ ) concentration.

In the following description, the air conditioner includes an air conditioner and a ventilation system.

In general, the air conditioner is composed of a mechanical device that cools and heats a room by using a heat exchange process between a heat exchange medium and an ambient atmosphere that undergoes a phase change process while circulating a closed circuit. Refers to cold and heating devices used as air conditioners to operate and hot air heaters to heat indoor cold air in winter.

An air conditioner having such a function is generally used in conjunction with a ventilation system inserted into a ceiling through a hole formed in a ceiling of a building, and the ventilation system introduces indoor air and exhausts it to the outside. It is composed of a process of supplying air and supplying air into the room.

In recent years, such a ventilation system has been increasing in use with an air conditioner due to the advantage of not taking up space in the room.

Hereinafter, an air conditioner according to the related art will be described with reference to the accompanying drawings.

FIG. 1 is an overall configuration diagram of a general air conditioner composed of an air conditioner and a ventilation system, and FIG. 2 is a block diagram of the air conditioner shown centering on the ventilation system.

In general, when the air conditioner is configured indoors and outdoors as shown in FIG. 1 and is cooled and operated through the air conditioner 10, the ventilation system drives an air supply fan to introduce outdoor air and heat the incoming air. After cooling to a temperature similar to the room temperature through the exchanger 20, it is introduced into the room through the air supply unit 22.

When the heating operation is performed through the air conditioner 10, the air flows through the circulation circuit opposite to the circulation direction during the cooling operation, and passes the indoor air through the exhaust unit 24 and the heat exchanger 20. To be exhausted.

The configuration of the air conditioner as described above with reference to the ventilation system in detail as follows.

As shown in FIG. 2, the ventilation system controls the whole system and detects the concentration of carbon dioxide, and controls the air supply fan drive and the intake fan drive based on the control unit 21 to ventilate the indoor air, and detects the temperature of the outside air. The outside air temperature sensor 22, the room temperature sensor 23 for detecting the temperature in the room, the damper position detection sensor 26 for detecting the position of the damper for adjusting the air volume, and the concentration of carbon dioxide (CO ₂ ) in the room is detected. An air supply fan driving circuit 28 for driving an air supply fan for supplying outdoor air to the room under the control of the control unit 21 according to the CO ₂ gas sensors 27 and the detection results of the sensors; When the air volume is determined by the exhaust fan driving circuit 29 for driving the exhaust fan for discharging indoor air to the outside and the control unit 21, the damper is driven according to the detection result of the damper position detection sensor 26. Damper It is configured to include a copper circuit 30.

Here, reference numeral 24 denotes a remote controller for inputting a signal for controlling the operation of the ventilation system by the user's selection, and 25 denotes an indoor unit of the air conditioner.

The air in an enclosed space increases the carbon dioxide content over time due to the breathing of life, which interferes with the breathing of life.

Therefore, when a large number of people, such as an office or a vehicle, stay in a confined space, it is necessary to frequently replace the polluted air in the room with fresh air from the outside.

In this case, a ventilation system as shown in FIG. 2 is used. The ventilation system of FIG. 2 is intended to solve a problem in the apparatus for only forcibly discharging indoor air when using one blower, and suppresses the sudden inflow of cold air and heat.

Referring to the air flow control method of the ventilation system of the prior art as follows.

Ventilation control method of the ventilation systems of the prior art is simply the algorithm for controlling a step 5 the fan air volume of supply air and exhaust in accordance with the amount of CO ₂ concentration by detecting the concentration of CO _2. (Japanese Unexamined Patent Publication No. 2001-304645)

As shown in FIG. 3, power is supplied, and it is determined whether or not the cooling mode is performed by the signal from the indoor unit (S301), and the air volume is controlled by dividing the cooling mode and the non-cooling mode.

First, the ventilation in the case of cooling is demonstrated.

If the outside air temperature and the set temperature (Ts) are lower than room temperature, the cold outside air is brought in from normal ventilation as it is, and the cooling efficiency should be improved, so the ventilation is performed at the maximum air volume (HH). (S302) (S303) (S308) )

In the case of room temperature <outside temperature <set temperature Ts, the ventilation is performed at the maximum air volume HH in the same manner. (S302) (S304) (S308)

On the other hand, in the case where the set temperature (Ts)> room temperature> outside air temperature, the air to be supplied is warmed by the exhaust gas, and heat exchange ventilation into the room is performed. (S302) (S303) (S309)

In addition, heat exchange ventilation is similarly performed even when the outside air temperature is higher than the room temperature and the set temperature Ts. (S302) (S304) (S309)

On the other hand, the ventilation process in the case of not being cooled, that is, in the heating or temperature control mode is as follows.

If the outside air temperature and the set temperature (Ts) are higher than room temperature, the outside air is usually brought in from the ventilation, but the heating efficiency should be improved, so the ventilation is performed at the maximum air volume (HH). (S305) (S306) (S308)

In the case of room temperature> outside temperature> set temperature (Ts), normal ventilation is also performed at the maximum air volume (HH). (S305) (S307) (S308)

On the other hand, in the case of outside temperature> room temperature> set temperature (Ts), heat is ventilated to bring the outside air that is supplied into the exhaust air into the exhaust air into the room. (S305) (S306) (S309)

In addition, heat exchange ventilation is similarly performed even when the outside temperature is lower than the room temperature and the set temperature Ts. (S305) (S307) (S309)

In this ventilation process, the heat exchange ventilation is performed as follows.

First, the concentration level of the carbon dioxide gas is determined (S310) and the air supply fan and the exhaust fan are converted into the maximum air volume (HH), the large air volume (H), the middle wind amount (M), and the low wind volume (L) according to the level of the carbon dioxide gas concentration. When operating and the concentration of carbon dioxide gas is significantly low, the air supply fan and the exhaust fan are stopped to end the ventilation.

The prior art ventilation control method is to detect the room temperature and the outside air temperature and compare and control the normal ventilation and heat exchange ventilation in comparison with the set temperature (Ts).

If heat exchange ventilation is required rather than normal ventilation, CO ₂ concentration is detected and ventilation is divided into five stages according to the concentration level.

However, the air volume control method of the ventilation system of the prior art described above has the following problems.

Ventilation of the prior art systems rely on the absolute value of the flow rate control by controlling a step 5 the flow rate of the air supply and exhaust fan CO ₂ concentration in accordance with the absolute value of the CO ₂ concentration so effective when there is a sharp change of CO ₂ concentration Can not cope with.

In other words, if the amount of change in CO ₂ concentration suddenly increases due to indoor smoking or a sudden increase in the number of people, it is difficult to maintain the cleanliness of the room because the air volume is controlled solely based on the CO ₂ concentration despite the rapid deterioration of indoor air. .

This is a problem that occurs because the ventilation proceeds mainly considering the load reduction aspect of the air conditioner rather than the cleanliness of the room.

The present invention is to solve the problem of the ventilation system of the prior art, it is possible to correct the air flow rate of the fan in response to a sudden change in the carbon dioxide (CO ₂ ) concentration air flow control method of the ventilation system to increase the ventilation efficiency. The purpose is to provide.

Air flow control method of the ventilation system according to the present invention for achieving the above object comprises the steps of obtaining the current CO ₂ concentration value and CO ₂ concentration change per unit time; the detected CO ₂ concentration value and the reference divided into a plurality of steps concentration as compared to the value determining the level of CO ₂ concentration; determining the level of CO ₂ concentration variation as compared to the reference variation value divided by the calculated CO ₂ concentration variation with the plurality of steps; CO ₂ concentration level and And controlling driving intensities of the air supply fan and the exhaust fan using the CO ₂ concentration change level.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of the embodiments.

Preferred embodiments of the air volume control method of the ventilation system according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a table illustrating a fuzzy membership function of the ventilation system according to the present invention, and FIG. 5 is a flowchart illustrating a method for controlling the air volume of the ventilation system according to the present invention.

The present invention simultaneously uses the absolute concentration value and the concentration change amount of CO ₂ as a reference factor for controlling the air volume.

This is a function as shown in the table of Figure 4 using the function as shown in the embodiment to actively correct the air volume for the rapid pollution (increase of CO ₂ ) of the indoor air caused by the cause of smoking, rapid increase in the number of people in the room, etc. It is to make it possible.

The purge membership function of FIG. 4 shows the correlation between the absolute concentration value of CO ₂ , the concentration change amount, and the air volume.

According to the purge rule of FIG. 4, when the concentration of CO ₂ is (small) and the amount of change in the concentration of CO ₂ is (small), it is judged that the room is clean, and it is judged that the situation of the room does not have a sudden increase in pollution. ).

If the concentration of CO ₂ is (small) and the amount of change in the concentration of CO ₂ is (large), the current indoor pollution level is not large, but it is determined that there is a sudden increase in pollution, and the air volume is controlled by (midwind).

If the concentration of CO ₂ is (medium) or (large) and the amount of change in the concentration of CO ₂ is (large), it is determined that the current indoor pollution is large and there is a sudden increase in pollution, and the air volume is controlled by (strong wind).

When the concentration of CO ₂ is (large), regardless of the amount of change in the concentration of CO ₂ , it is determined that the pollution level of the current room is very large, and the air volume is controlled by (strong wind).

When the concentration of CO ₂ is (medium), if the change in the concentration of CO ₂ is (small), it is determined that the present indoor pollution degree is somewhat large, but there is no sudden pollution, and the air volume is controlled by (light wind).

When the concentration of CO ₂ is (small), the amount of change in the concentration of CO ₂ is (small) or (medium), and thus the current indoor pollution is not large.

Of course, when the concentration of CO ₂ is (medium) and the concentration change of CO ₂ is (medium), the pollution level and the increase in pollution degree of the current room are determined to be medium in size, and the air volume is controlled by (midwind).

As described above, a method of controlling the air volume of the ventilation system using the fuzzy membership function considering both the current indoor CO ₂ concentration value and the CO ₂ concentration change amount in a unit time is as follows.

As shown in FIG. 5, the CO ₂ concentration is detected (S501), and a difference value between the current CO ₂ concentration and the previous CO ₂ concentration is obtained to obtain a change amount of CO ₂ concentration (S502).

In this way, when the current CO ₂ concentration and the CO ₂ concentration change amount are obtained, a step for controlling the air volume is performed.

In the following description, the criteria for the size of the current CO ₂ concentration are divided into (large)>(medium)> (small), and the criteria for the magnitude of the change in the amount of CO ₂ concentration are divided into (large)>(medium)> (small). However, it is natural that the air volume can be controlled to further refine the size division so that accurate and rapid ventilation is achieved.

First, it is determined whether the current CO ₂ concentration is smaller than the reference level (small) (S503).

As a result of the determination, if the current CO ₂ concentration is smaller than the reference level (small), the amount of change of the CO ₂ concentration is compared with the reference level (small) (S504).

As a result, it drives the supply air fan and the exhaust fan, if the CO ₂ concentration variation is small, and the size of the CO ₂ concentration (small), it is judged to be the size of the CO ₂ concentration variation (S) in Mild Wind. (S505)

If the CO ₂ concentration change amount is larger than the reference level (small), the CO ₂ concentration change amount is compared with the reference level (middle).

If as a result CO is less than the _{concentration} change the reference level (M), driving the air supply fan and the exhaust fan and the (small) amount of CO ₂ concentration, it is judged to be the size of the CO ₂ concentration variation (M) in Mild Wind (S507)

Here, as a result, CO if the _{concentration} change amount is greater than the reference level (M), and the size of the CO ₂ concentration (small), it is judged to be the size of the CO ₂ concentration variation (large) stroke the air supply fan and the exhaust fan (S508)

If the current CO ₂ concentration is greater than the reference level (small), the current CO ₂ concentration is compared with the reference level (middle).

Here, if the current CO ₂ concentration is smaller than the reference level (medium), the amount of change in the CO ₂ concentration is compared with the reference level (small) (S510).

As a result, it drives the supply air fan and the exhaust fan, if the CO ₂ concentration variation is small, and the size of the CO ₂ concentration (M), it is judged to be the size of the CO ₂ concentration variation (S) in Mild Wind. (S511)

If the amount of change in CO ₂ concentration is greater than the reference level (small), the amount of change in CO ₂ concentration is compared with the reference level (middle).

If as a result CO is less than the _{concentration} change the reference level (M), driving the air supply fan and the exhaust fan and the size of the CO ₂ concentration (M), it is judged to be the size of the CO ₂ concentration variation (M) in Stroke (S513)

Here, as a result, CO if the _{concentration} change amount is greater than the reference level (M), and the size of the CO ₂ concentration (M), it is judged to be the size of the CO ₂ concentration variation (large) winds the air supply fan and the exhaust fan (S514)

If the current CO ₂ concentration is greater than the reference level (medium), it is determined that the current CO ₂ concentration corresponds to the reference level (large), and the amount of change of the CO ₂ concentration is compared with the reference level (small) (S515).

As a result, drives the supply air fan and the exhaust fan, if the CO ₂ concentration variation is small, and the size of the CO ₂ concentration (large), it is judged to be the size of the CO ₂ concentration variation (S) by a strong wind. (S516)

If the CO ₂ concentration change amount is larger than the reference level (small), the CO ₂ concentration change amount is compared with the reference level (middle).

If as a result CO is less than the _{concentration} change the reference level (M), the size of the CO ₂ concentration (large), and driving the air supply fan and the exhaust fan is judged to be the size of the CO ₂ concentration variation (M) in high winds (S518)

Here, as a result, CO if the _{concentration} change amount is greater than the reference level (M), the size of the CO ₂ concentration (large), and it is judged to be the size of the CO ₂ concentration variation (large) winds the air supply fan and the exhaust fan (S519).

As described above, in the air flow control method of the ventilation system according to the present invention, when the CO ₂ concentration is determined as (large), the ventilation of the indoor air should be performed quickly regardless of the magnitude of the change in the CO ₂ concentration. To drive.

When it is determined that the CO ₂ concentration change amount is (large), the indoor air is rapidly deteriorated even when the current CO ₂ concentration is at the (small) level, so that the air supply fan and the exhaust fan are driven by the heavy wind.

In this way, since the CO ₂ concentration change amount is used as the airflow control factor, it is possible to efficiently cope with the case where the indoor pollution degree suddenly worsens.

That is, even if the amount of change in the CO ₂ concentration suddenly increases due to smoking in the room or a sudden increase in the number of people, the cleanliness of the room can be efficiently maintained.

Such a method for controlling the air volume of the scalding system according to the present invention has the following effects.

First, in addition to the absolute value of the CO ₂ concentration, the change in concentration at the unit time can be used for the air volume control to efficiently cope with rapid indoor air pollution.

Second, by controlling the air flow rate using various factors such as the CO ₂ concentration value and the CO ₂ concentration change amount, the ventilation can be made in the most suitable form according to the pollution degree of the indoor air.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

1 is an overall configuration diagram of a general air conditioner composed of an air conditioner and a ventilation system

2 is a block diagram showing the configuration of an air conditioner centered on a ventilation system;

3 is a flow chart for the ventilation control of the air conditioner of the prior art

4 is a table showing the fuzzy membership function of the ventilation system according to the present invention.

5 is a flow chart illustrating a method for controlling the air volume of the ventilation system according to the present invention.

Explanation of symbols for the main parts of the drawings

21. Control unit 22. Ambient temperature sensor

23. Room temperature sensor 24. Remote control

25. Indoor unit 26. Damper position detection sensor

27.CO ₂ gas sensor 28.Air supply fan drive circuit

29. Exhaust fan drive circuit 30. Damper drive circuit

Claims (12)

Obtaining a current CO ₂ concentration value and a change amount of CO ₂ concentration per unit time; Determining the level of the CO ₂ concentration by comparing the detected CO ₂ concentration value with a reference concentration value divided into a plurality of steps; Comparing the obtained change amount of CO ₂ with a reference change amount divided into a plurality of steps to determine a level of the change amount of CO ₂ ; And controlling the driving intensity of the air supply fan and the exhaust fan using the CO ₂ concentration level and the CO ₂ concentration change level. The method of claim 1, wherein the controlling the drive strength of the air supply fan and exhaust fan, If the level of the obtained CO ₂ concentration is the highest level, the air volume control method of the ventilation system, characterized in that for driving the air supply fan and the exhaust fan at the greatest intensity irrespective of the change amount of the CO ₂ concentration. The method of claim 1, wherein the controlling the drive strength of the air supply fan and exhaust fan, When the calculated CO ₂ concentration level, the amount of change of the highest level, the air volume control method of the ventilation system, characterized in that the CO ₂ concentration level, except for the smallest and when driving the air supply fan and the exhaust fan with the largest intensity. The method of claim 1, wherein in the step of determining the level of the CO ₂ concentration and the CO ₂ concentration change amount in order to control the driving intensity of the air supply fan and the exhaust fan, The criteria for the size of the current CO ₂ concentration are divided into (large)>(medium)> (small), and the criteria for the magnitude of the change in the amount of CO ₂ concentration are divided into (large)>(medium)> (small). Comparing the current CO ₂ concentration with a reference level (small); If the current CO ₂ concentration is less than the reference level (small) as a result of the determination, comparing the change amount of CO ₂ concentration with the reference level (small); If the result is less CO ₂ concentration variation, and the amount of CO ₂ concentration (S), the method comprising: determining that the size of the CO ₂ concentration variation (S), A method for controlling the air volume of a ventilation system, wherein the air supply fan and the exhaust fan are driven by weak wind. The surface is greater than, the concentration level of CO ₂ in the change in the reference and comparing the reference level (S), the CO ₂ concentration variation (S) according to 4, wherein Comparing the CO ₂ concentration change with a reference level (medium); If as a result CO is less than the _{concentration} change the reference level (M), the size of the CO ₂ concentration (S) and comprising: determining that the size of the CO ₂ concentration variation (M), and the air supply fan and the exhaust A method for controlling the air volume of a ventilation system, characterized in that the fan is driven by weak wind. The method of claim 5, wherein if the step of comparing the CO ₂ concentration variation with the reference level (M) is the CO ₂ concentration variation is greater than the reference level (M), And determining that the magnitude of the CO ₂ concentration is (small) and that the magnitude of the CO ₂ concentration change is (large), and driving the air supply fan and the exhaust fan to mid-air. The method of claim 1, wherein in the step of determining the level of the CO ₂ concentration and the CO ₂ concentration change amount in order to control the driving intensity of the air supply fan and the exhaust fan, The criteria for the size of the current CO ₂ concentration are divided into (large)>(medium)> (small), and the criteria for the magnitude of the change in the amount of CO ₂ concentration are divided into (large)>(medium)> (small). If the current CO ₂ concentration is greater than the reference level (small), comparing the current CO ₂ concentration with the reference level (middle); If the current CO ₂ concentration is less than the reference level (middle), comparing the change in the CO ₂ concentration with the reference level (small); If as a result CO is less _{concentration} variation, and (in) the size of the CO ₂ concentration, in that it comprises a step of determining that the size of the CO ₂ concentration variation (S) and driven in Mild Wind the air supply fan and the exhaust fan A flow rate control method of the ventilation system characterized by the above-mentioned. The surface is greater than, the concentration level of CO ₂ in the change in the reference and comparing the reference level (S), the CO ₂ concentration variation (S) according to 7 wherein Comparing the CO ₂ concentration change with a reference level (medium); If the resultant CO ₂ concentration change is less than the reference level (medium), determining that the magnitude of the CO ₂ concentration is medium and the magnitude of the CO ₂ concentration change is medium; A method for controlling the air volume of a ventilation system, characterized in that the fan is driven by a heavy wind. The method of claim 8, wherein if the step of comparing the CO ₂ concentration variation with the reference level (M) is the CO ₂ concentration variation is greater than the reference level (M), A method for controlling the air volume of a ventilation system, characterized in that the magnitude of the CO ₂ concentration is medium and that the magnitude of the CO ₂ concentration change is large. The method of claim 1, wherein in the step of determining the level of the CO ₂ concentration and the CO ₂ concentration change amount in order to control the driving intensity of the air supply fan and the exhaust fan, The criteria for the size of the current CO ₂ concentration are divided into (large)>(medium)> (small), and the criteria for the magnitude of the change in the amount of CO ₂ concentration are divided into (large)>(medium)> (small). If the current CO ₂ concentration is greater than the reference level (middle), determining that the current CO ₂ concentration corresponds to the reference level (large); Comparing the CO ₂ concentration change with a reference level (small); As a result, CO if the _{concentration} variation is small, and the size of the CO ₂ concentration (L), comprising the step of determining that the size of the CO ₂ concentration variation (S), and driving the air supply fan and the exhaust fan with high winds Air flow control method of the ventilation system, characterized in that. The method of claim 10, wherein the surface in the step of comparing the reference level (S), the CO ₂ concentration variation is greater than the CO ₂ concentration change the reference level (S), Comparing the CO ₂ concentration change with a reference level (medium); If as a result CO is less than the _{concentration} change the reference level (M), the size of the CO ₂ concentration (L), and comprising determining that the size of the CO ₂ concentration variation (M), and the air supply fan and the exhaust A method for controlling the air volume of a ventilation system, characterized in that the fan is driven by a strong wind. The method of claim 11, wherein the surface in the step of comparing the CO ₂ concentration variation with the reference level (M) is the CO ₂ concentration variation is greater than the reference level (M), And determining that the magnitude of the CO ₂ concentration is (large) and the magnitude of the CO ₂ concentration change is (large), thereby driving the air supply fan and the exhaust fan with strong wind.