KR20040102565A - Method for controlling airflow volume of ventilating system - Google Patents

Abstract

PURPOSE: An air volume control method of a ventilating system is provided to enhance ventilating efficiency by correcting air volume correspondently to a sudden change in concentration of carbon dioxide and a state continued for predetermined time. CONSTITUTION: An air volume control method of a ventilating system comprises steps of determining an air volume control mode(S401); determining whether the concentration of carbon dioxide of a room is smaller than first reference concentration in case of an automatic air volume mode(S403); turning a supply fan and an exhaust fan(S404); detecting a change of the current concentration of carbon dioxide and the former concentration of carbon dioxide(S405); operating the supply fan and the exhaust fan in a strong wind state(S407); detecting the concentration of carbon dioxide and determining whether the detected concentration of carbon dioxide is smaller than second reference concentration(S408); determining whether the corresponding concentration is continued beyond first reference time(S409); controlling the driving strength of the supply fan and the exhaust fan into a weak wind state(S410); determining whether the corresponding concentration is continued beyond second reference time(S411); raising the driving strength of the supply fan and the exhaust fan(S412); determining the corresponding concentration is continued beyond the first reference time(S414); raising the driving strength of the supply fan and exhaust fan to the strong wind state(S415); determining whether the corresponding concentration is continued beyond the first reference time(S416); raising the driving strength of the supply fan and the exhaust fan to an intermediate wind state(S417); determining the detected concentration of carbon dioxide is continued beyond the second reference time while executing ventilation(S418); and raising the driving strength of the supply fan and the exhaust fan(S419).

Description

Method for controlling airflow volume of ventilating system

The present invention relates to an air conditioner, and more particularly, to a method for controlling the air volume of a ventilation system having improved ventilation efficiency by allowing the air volume of a fan to be corrected in response to a sudden change in carbon dioxide (CO ₂ ) concentration and a condition that lasts for a predetermined time. will be.

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 the problem in a device that only forces the discharge of indoor air when using one blower.

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

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

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.

If so the conventional ventilation system of the technique depends only 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 in the rapid change of CO ₂ concentration or a certain Even if the ventilation is performed for a long time, the CO ₂ concentration is kept above a certain value so that it cannot be effectively dealt with when the indoor environment is not clean.

In other words, if the amount of change in the CO ₂ concentration suddenly occurs due to smoking indoors or a sudden increase in the number of people, the air volume is controlled only by the absolute value of the CO ₂ concentration despite the fact that the indoor air is rapidly deteriorated. In terms of road maintenance is not good.

In addition, although the air volume control for ventilation should be made variable according to the state of the indoor environment, if there is no change in the concentration, there is a problem that the current air volume is not maintained to improve the indoor environment.

This is a problem because the ventilation proceeds mainly considering the load-reducing side of the air conditioner.

The present invention is to solve the problem of the ventilation system of the prior art, it is possible to correct the air volume of the fan in response to a sudden change in the carbon dioxide (CO ₂ ) concentration and the carbon dioxide concentration for a certain period of time ventilation efficiency The purpose of the present invention is to provide a method for controlling the air volume of the ventilation system having been increased.

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 flow chart for controlling the air volume of the ventilation system according to the present invention

5 is a flowchart illustrating a subroutine process when the set air volume is not automatic when the air volume control according to the present invention is performed;

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

Method for controlling the air volume of the ventilation system according to the present invention for achieving the above object comprises the steps of determining whether the ventilation is required by detecting the current CO ₂ concentration; if the ventilation is necessary to detect the change amount of CO ₂ concentration reference value (K) Controlling the air supply fan and the exhaust fan to be driven at the strongest intensity; when the concentration change is less than or equal to the reference value K, the air volume is controlled according to the corresponding CO ₂ concentration level, and when the concentration is maintained for the reference time. And increasing the intensity of the supply fan and the exhaust fan by one step from the current state.

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 flowchart for controlling the air volume of the ventilation system according to the present invention, and FIG. 5 is a flowchart illustrating a subroutine process when the set air volume is not automatic at the time of controlling the air volume according to the present invention.

Air volume control method of the ventilation system according to the present invention controls the fan air volume to an absolute concentration value of CO ₂ and, CO ₂ concentration present in the CO ₂ concentration for a period of time, if a rapid increase again correct the air volume of the fan, and the amount of change is If it is maintained as it is, the fan airflow is increased by one step so that it can actively respond to the indoor situation.

The air volume control method according to the present invention is divided according to the air volume control mode.

First, when the air volume control mode is not set to 'automatic air volume', as illustrated in FIG. 5, the intensity of the air supply fan and the exhaust fan is controlled according to the set air volume.

Here, when the outdoor temperature is equal to or less than the reference temperature, the set amount of air is reduced by light wind in order to prevent a decrease in the indoor temperature.

Second, when the airflow control mode is set to 'automatic airflow', CO ₂ concentration detection and control of the supply fan and exhaust fan according to the result, CO ₂ concentration detection and control according to the result, and the duration of the CO ₂ concentration check And a control algorithm according to the result.

This control algorithm is to use the CO ₂ concentration, CO ₂ concentration change, and the duration of the CO ₂ concentration in the control of the supply fan and exhaust fan to more actively determine and respond to the indoor situation.

When the air volume control method of the ventilation system according to the present invention is set air volume is input to the automatic air volume on the remote control, by detecting the concentration of CO ₂ the lowest concentration of the concentration of CO ₂ acceptable that is, equal to or less than the first reference level (S1) room Determine that the air is clean and turn off the supply and exhaust fans.

And it not less than the concentration of the CO ₂ the first reference level (S1), means that measure the amount of change of CO ₂ concentration is above the concentration of CO ₂ a certain constant (K) of the room air is rapidly deteriorated by the external impact, and At this time, the air supply and the exhaust fan operate with strong wind.

When the concentration change of the CO ₂ is not abrupt and the concentration is lower than the second reference concentration S2 for the first reference time T1, the room is sensed to be in a bad state and the air supply and the exhaust fan are operated in a mild wind. At this time, if the second reference time (T2) or more continues, it is determined that the ventilation capacity is insufficient in the current air flow rate to increase the air supply and exhaust fan air flow by one step.

If the CO ₂ concentration is less than or equal to the third reference concentration (S3), the air supply and the exhaust fan are operated in the middle wind, and if the second reference time (T2) is maintained for longer than the current air volume, the ventilation capacity is determined to be insufficient. Step up

When the CO ₂ concentration is greater than or equal to the third reference concentration S3 during the first reference time T1, it is determined that the air in the room is considerably bad, and the air supply and the exhaust fan are driven in a strong wind.

In detail, as shown in FIG. 4, in operation S401, the air volume control mode is determined to determine whether the indoor CO ₂ concentration is smaller than the first reference concentration S1 (S403).

Here, the first reference concentration (S1) means the allowable CO ₂ concentration without ventilation, in the embodiment of the present invention based on 500ppm.

If less than the first reference concentration (S1) used as an acceptance criterion, since the ventilation is not necessary, both the air supply fan and the exhaust fan are turned off. (S404)

If the detected concentration of CO ₂ is greater than the first reference concentration S1, the amount of change in the current CO ₂ concentration and the previous CO ₂ concentration is detected (S405).

Here, it is natural that the time interval between the detection time point of the previous CO ₂ concentration and the detection time point of the current CO ₂ concentration can be varied in consideration of the air volume control precision.

When such a change in CO ₂ concentration is detected, the amount of change in the detected CO ₂ concentration is greater than the allowable constant (K) by comparing the detected change and the constant constant (K). The fan and the exhaust fan are operated in strong wind. (S407)

Here, the constant constant (K) is a state that can be properly ventilated even if there is a change in the CO ₂ concentration, the size is not large, even if the current state is maintained without changing the driving intensity of the supply and exhaust fans. It is a standard.

In an embodiment of the present invention, a constant constant (K) is set based on 100 ppm.

If the amount of change in the CO ₂ concentration is smaller than the constant constant K, the CO ₂ concentration is detected again and compared with the second reference concentration S 2 to determine whether the change is small (S408).

If the detected CO ₂ concentration is smaller than the second reference concentration S2, it is determined whether the corresponding concentration lasts more than the first reference time T1 (S409).

Here, the current state is maintained if the corresponding CO ₂ concentration decreases without lasting longer than the first reference time T1.

If the corresponding CO ₂ concentration continues for more than the first reference time T1, the driving strengths of the air supply fan and the intake fan are controlled by light wind (S410).

The CO ₂ concentration is detected while controlling the ventilation air volume in this state, and it is determined whether the corresponding concentration lasts more than the second reference time T2.

If the CO ₂ concentration decreases without continuing for more than the second reference time T2, the current state is maintained. If the CO ₂ concentration lasts for more than the second reference time T2, the driving intensity of the air supply fan and the intake fan is increased by one step. (S412)

In the embodiment of the present invention described above, the first reference time T1 is set to 30 minutes, and the second reference time T2 is set to 1 hour.

If the CO ₂ concentration detected in the step S408 is greater than the second reference concentration S ₂ , the current CO ₂ concentration is compared with the third reference concentration S 3 (S413).

Here, the third reference concentration S3 is for determining a state in which the indoor state is not very good and is set based on 1000 ppm.

If the detected CO ₂ concentration is greater than the third reference concentration S3, it is determined whether the corresponding concentration lasts longer than the first reference time T1 (S414).

If the CO ₂ concentration decreases without lasting for more than the first reference time T1, the current state is maintained. If the CO ₂ concentration lasts for more than the first reference time T1, the driving intensity of the air supply fan and the intake fan is increased to increase the wind speed. Control by (S415).

If the detected CO ₂ concentration is smaller than the third reference concentration S3, it is determined whether the corresponding concentration lasts more than the first reference time T1 (S416).

If the CO ₂ concentration decreases without continuing for more than the first reference time T1, the current state is maintained. If the CO ₂ concentration lasts for more than the first reference time T1, the driving intensity of the air supply fan and the intake fan is increased. Control by stroke. (S417)

In this way, the air supply fan and the intake fan are controlled by the mid-air to perform ventilation to determine whether the detected CO ₂ concentration lasts more than the second reference time T2. (S418)

If the CO ₂ concentration continues for more than the second reference time T2, it is determined that the improvement of indoor air is not achieved with the current air volume, and the driving intensity of the air supply fan and the intake fan is increased by one step.

In the above description, the first and second reference times and the first and second and third reference concentration values may be changed in consideration of control accuracy, and it is natural that the reference concentration values may be further divided and set in various steps. .

And if the set air volume of the remote control is not automatic, it operates with the set air volume of the remote control. If the outdoor temperature is less than -10 ℃, the set air volume is limited to the weak air to prevent a decrease in the indoor temperature.

Specifically, as shown in FIG. 5, the execution of the set air volume subroutine in the case of operating at the set air volume of the remote controller first determines whether the set air volume is set to strong wind (S501).

If it is set to strong wind, it is determined whether the outdoor temperature is below a predetermined temperature (S504). If the temperature is above a predetermined temperature, the air supply fan and the exhaust fan are controlled to have a strong wind according to the set value (S506).

Here, the outdoor temperature reference value is based on -10 ° C.

If the outdoor temperature is -10 ° C or lower, even if the set value is a strong wind, the air supply fan and the exhaust fan are lowered by one step to prevent a decrease in the indoor temperature.

When the set air volume is not strong wind, it is determined whether the set value is mid wind or low wind without determining the outdoor temperature (S502) (S503), and the air supply fan and the exhaust fan are driven by the midwind (S507) or the low wind (S508).

Of course, if the set value is not a strong wind, a heavy wind, or a weak wind, turn off both the supply fan and the exhaust fan. (S509)

In this way the air volume control of the ventilation system according to the present invention is active in response to indoor conditions by controlling the fan air volume to an absolute concentration value of CO ₂ and, if correct the air volume of the fan to the rapid increase with the density change amount of the CO ₂ do.

The air volume control method of the ventilation 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, when the CO ₂ concentration is not improved by the ventilation within the reference time, the ventilation efficiency can be improved by raising the driving intensity of the air supply fan and the exhaust fan by one step.

Third, by controlling the air flow rate using various factors such as the CO ₂ concentration value, the presence or absence of automatic air flow rate setting, the CO ₂ concentration change amount, the outdoor temperature, and the like, 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.

Claims (16)

Determining whether ventilation is required by detecting a current CO ₂ concentration; Detecting a change in CO ₂ concentration when ventilation is required and controlling the air supply fan and the exhaust fan to be driven at the strongest intensity if the reference value K is greater than or equal to the reference value K; Controlling the air volume according to the corresponding CO ₂ concentration level if the change in concentration is less than or equal to the reference value (K); and if the concentration is maintained for a reference time, increasing the intensity of the supply and exhaust fans by one step from the current state. Air flow control method of the ventilation system, characterized in that. The method of claim 1, wherein the step of detecting whether the ventilation is required by detecting the current CO ₂ concentration is performed only when the airflow control mode is set to 'automatic airflow', and when not, the air supply fan according to the airflow fan set by the user. A method for controlling the air volume of a ventilation system, characterized in that for controlling the intensity of the exhaust fan. The method of claim 2, wherein in the case of controlling the intensity of the air supply fan and the exhaust fan according to the set air flow rate, the air supply fan and the exhaust fan are driven at the weakest intensity when the outdoor temperature is below a certain temperature even when the intensity of the air supply fan and the exhaust fan is set to the strongest intensity. Air flow control method of the ventilation system, characterized in that. 4. A method according to claim 3, wherein the air supply fan and the exhaust fan are driven at the weakest intensity when the outdoor temperature is -10 ° C or lower. 2. The method of controlling the air volume of the ventilation system according to claim 1, wherein the reference value K is 100 ppm and compared with a current CO ₂ concentration and a previous CO ₂ concentration difference value. The method according to claim 1, wherein in the step of determining whether ventilation is necessary, when the detected current CO ₂ concentration value is small compared with the detected current CO ₂ concentration value and the first reference concentration value S1 set to 500 ppm, A method for controlling the air volume of a ventilation system, wherein both the air supply fan and the exhaust fan are turned off. The method of claim 1, wherein controlling the air volume according to the CO ₂ concentration level comprises: If the CO ₂ concentration change is less than the reference value K, comparing the CO ₂ concentration with the second reference concentration S2; If the detected CO ₂ concentration is less than the second reference concentration S2, driving the air supply fan and the intake fan to the weakest intensity after the first reference time T1 passes; Detecting the CO ₂ concentration while the ventilation is performed in this state, and increasing the driving intensity of the air supply fan and the intake fan by one step if the corresponding concentration persists for more than a second reference time T2. Air flow control method. The method according to claim 7, wherein the supply fan and the intake fan are driven at the weakest intensity, and the ventilation is performed to reduce the CO ₂ concentration before the second reference time T2 passes. A method for controlling the air volume of a ventilation system according to claim 1, wherein the air quality of the air supply fan and the intake fan are maintained as it is determined by the improvement of indoor air even in the current state. 8. The air volume control method according to claim 7, wherein the second reference concentration (S2) is set at 700 ppm. According to claim 1, by comparing the CO ₂ concentration detected in the step of controlling the air volume in accordance with the CO ₂ concentration level and the second reference level (S2) it is greater the CO ₂ concentration, Comparing the current CO ₂ concentration with the third reference concentration S3 again; Driving the air supply fan and the exhaust fan to the strongest intensity when the detected CO ₂ concentration lasts more than the first reference time T1 in a state larger than the third reference concentration S3. Air flow control method. The method according to claim 10, wherein if the detected CO ₂ concentration decreases without lasting more than the first reference time T1 in a state larger than the third reference concentration S3, A method for controlling the air volume of a ventilation system according to claim 1, wherein the air quality of the air supply fan and the intake fan are maintained as it is determined by the improvement of indoor air even in the current state. 11. The method of claim 10, wherein the third reference concentration (S3) is for determining a state in which the indoor condition is not very good, and is set based on 1000 ppm. The method according to claim 10, wherein if the detected CO ₂ concentration is smaller than the third reference concentration S3, And controlling the air supply fan and the intake fan at medium intensity by determining whether the concentration lasts longer than the first reference time T1. 15. The method of claim 13, wherein the air supply fan and the intake fan is driven at a medium intensity while ventilation is performed, and if the concentration is maintained for more than a second reference time T2, the driving intensity of the air supply fan and the intake fan is increased by one step. Air volume control method of ventilation system to use. The air flow rate control method according to claim 10, wherein the third reference concentration (S3) is set based on 1000 ppm. The airflow control method according to claim 7 or 10, wherein the first reference time (T1) is set to 30 minutes and the second reference time (T2) is set to 1 hour.