KR102582533B1 - Air conditioning system and a method controlling the same - Google Patents

Abstract

The present invention relates to an air conditioning system and its control method.
In order to solve the above problems, the air conditioning system according to the embodiment of the present invention is equipped with a controller that can adjust the ventilation amount and cooling and heating capacity based on indoor temperature and humidity information and air quality information, so that optimal ventilation-linked cooling and heating operation is possible. It may be possible.

Description

Air conditioning system and a method controlling the same}

The present invention relates to an air conditioning system and its control method.

An air conditioner is a device that maintains the air in a given space in the most suitable condition according to the use and purpose. Generally, the air conditioner includes a compressor, a condenser, an expansion device, and an evaporator, and operates a refrigeration cycle that performs the compression, condensation, expansion, and evaporation processes of the refrigerant, thereby cooling or heating the predetermined space. .

The predetermined space may be proposed in various ways depending on the location where the air conditioner is used. For example, when the air conditioner is placed in a home or office, the predetermined space may be an indoor space of the house or building. On the other hand, when the air conditioner is placed in a car, the predetermined space may be a boarding space for people.

When the air conditioner performs a cooling operation, the outdoor heat exchanger provided in the outdoor unit functions as a condenser, and the indoor heat exchanger provided in the indoor unit functions as an evaporator. On the other hand, when the air conditioner performs a heating operation, the indoor heat exchanger functions as a condenser and the outdoor heat exchanger functions as an evaporator.

Recently, these air conditioners not only control the indoor temperature by discharging hot and cold air into the room, but are also combined with a ventilation system that discharges indoor air to the outside and brings in outside air to ventilate the indoor air.

In such air conditioning systems, conventional ventilation or cooling/heating operation is performed only considering indoor and outdoor temperature/humidity information and without considering indoor CO2 information or fine dust information, so that indoor air quality actually worsens after the system is operated. There was a problem.

In addition, in the process of linking indoor air ventilation and cooling and heating operation, feedback of indoor air temperature and humidity information or air quality information is not properly provided, resulting in inefficient system operation and large power consumption.

Prior literature information related to the conventional air conditioning system is as follows.

1. Registration number (registration date): 10-1657559 (September 8, 2016)

2. Name of invention: Air conditioner system

In order to solve the above-mentioned problems, the purpose of the present invention is to provide an air conditioning system that can achieve optimal ventilation volume control by considering indoor temperature and humidity information and air quality information as well as cooling and heating capacity.

In addition, the purpose is to provide an air conditioning system that can prevent cooling and heating capacity from being reduced when the ventilation amount is high or cooling and heating capacity from being unnecessarily increased when the ventilation amount is low, by adjusting the cooling and heating capacity according to the ventilation amount.

In addition, it provides an air conditioning system that can improve indoor air quality by controlling the ventilation flow path and ventilation amount by considering outdoor air information transmitted through the server and indoor air information recognized through sensors in indoor space. The purpose is to

In addition, the purpose is to provide an air conditioning system that can be operated efficiently and economically by optimally controlling the target pressure of the outdoor unit, taking into account information on changes in indoor air due to ventilation.

In order to solve the above problems, the air conditioning system according to the embodiment of the present invention is equipped with a controller that can adjust the ventilation amount and cooling and heating capacity based on indoor temperature and humidity information and air quality information, so that optimal ventilation-linked cooling and heating operation is possible. It may be possible.

Additionally, the controller controls the ventilation fan to increase or decrease the amount of outdoor air introduced based on the indoor set temperature and the outdoor temperature, so that ventilation can be easily achieved without excessively increasing the cooling or heating load.

Additionally, the controller can change the ventilation flow path or increase or decrease the amount of outdoor air introduced based on the indoor carbon dioxide concentration or fine dust concentration, thereby improving indoor air quality.

In addition, along with the ventilation operation, it is possible to determine whether the operating conditions of the outdoor unit have changed based on indoor air information and to optimally control the target operation of the refrigerant cycle accordingly, making it possible to operate an efficient and economical system.

A control method of an air conditioning system according to an embodiment of the present invention includes the steps of recognizing a difference between the set temperature of the indoor space and the temperature of the outdoor air and determining whether to increase or decrease the amount of outdoor air introduced through the outdoor pipe; detecting the carbon dioxide concentration in the indoor space and determining an increase or decrease in the amount of outdoor air introduced through the external pipe; detecting the dust concentration in the indoor space and determining an increase or decrease in the amount of outdoor air introduced through the external pipe; and varying the operating frequency of the compressor provided in the outdoor unit based on the temperature and humidity of the indoor space.

If the temperature difference between the set temperature of the indoor space and the outdoor air is within the reference temperature value, the amount of outdoor air introduced through the external pipe is increased during the first set time, and the temperature difference between the set temperature of the indoor space and the outdoor air is set to the standard temperature. If the value is exceeded, the amount of external air introduced through the external pipe may be reduced or the introduction of external air may be blocked during the first set time.

A step of determining whether to increase or decrease the amount of outdoor air introduced through the external pipe may be further included based on whether the humidity of the indoor space is within a comfortable humidity range.

If the humidity of the indoor space is within the comfortable humidity range, the amount of outdoor air introduced through the external pipe is increased during the second set time, and if the humidity of the indoor space is outside the comfortable humidity range, the outside air is increased during the second set time. It is possible to reduce the amount of external air introduced through the trachea or block the introduction of external air.

If the carbon dioxide concentration in the indoor space exceeds the standard concentration, the amount of outdoor air introduced through the external pipe is increased during the third set time, and if the carbon dioxide concentration in the indoor space is below the standard concentration, the outside air is increased during the third set time. It is possible to reduce the amount of external air introduced through the trachea or block the introduction of external air.

If the dust concentration in the indoor space exceeds the standard concentration and the outdoor dust concentration is less than the standard concentration, the amount of outdoor air introduced through the outdoor pipe is increased for a fourth set time and the flow path is controlled so that the outdoor air passes through the filter, If the outdoor dust concentration exceeds the standard concentration, the introduction of outdoor air may be blocked during the fourth set time.

If the dust concentration in the indoor space and the outdoor dust concentration are each less than the standard concentration, outdoor air introduced through the external pipe during the fourth set time may be supplied to the indoor space by bypassing the filter.

When the air conditioner performs a cooling operation while the temperature of the indoor space is higher than the set temperature, if the humidity of the indoor space is within the range of comfortable humidity, the operating frequency of the compressor provided in the outdoor unit is reduced from the set frequency. to increase the target evaporation pressure, and when the humidity of the indoor space becomes more than the comfortable humidity, the target evaporation pressure can be lowered by increasing the operating frequency of the compressor beyond the set frequency.

When the heating operation of the air conditioner is performed while the temperature of the indoor space is lower than the set temperature, if the humidity of the indoor space is within the range of comfortable humidity, the operating frequency of the compressor provided in the outdoor unit is reduced from the set frequency. The target condensation pressure can be lowered, and if the humidity of the indoor space is lower than the comfortable humidity, the operating frequency of the compressor can be increased beyond the set frequency to increase the target condensation pressure.

During cooling or heating operation of the air conditioner, when the operating frequency of the compressor is increased beyond the set frequency, the rotation speed of the outdoor fan provided in the outdoor unit becomes more than the set rotation speed, and the operating frequency of the compressor is changed to the set frequency. When further reduced, the rotation speed of the outdoor fan may become less than the set rotation speed.

An air conditioning system according to another aspect includes a supply pipe that supplies air to the indoor space (R), an exhaust pipe that exhausts air from the indoor space (R), an exterior pipe that introduces outside air, and a return pipe branched from the exhaust pipe; An air conditioner including a mixing chamber in which the external pipe and the external pipe are connected and in which air flowing through the external pipe and the external pipe is mixed, a heat exchange chamber in which a heat exchange coil is installed, and a supply chamber in which a supply fan is installed; and an outdoor unit connected to the heat exchange coil and equipped with a compressor.

The air conditioning system includes a temperature sensor that detects the temperature of the indoor space (R); A CO2 sensor that detects the carbon dioxide concentration in the indoor space (R); A dust sensor that detects the concentration of fine dust in the indoor space (R); and a controller that controls to increase or decrease the amount of outside air introduced through the outside pipe based on information detected by the temperature sensor, CO2 sensor, and dust sensor.

It further includes a humidity sensor that detects the humidity of the indoor space (R) and is configured integrally with the temperature sensor or as a separate device, and the controller controls the external organ based on the information detected by the humidity sensor. The amount of external air introduced can be controlled to increase or decrease.

The controller may increase or decrease the operating frequency of the compressor based on whether the humidity of the indoor space detected by the humidity sensor is within a comfortable humidity range.

A filter provided in the mixing chamber; a bypass pipe extending from the mixing chamber to the heat exchange chamber and guiding air in the mixing chamber to bypass the filter; And a bypass damper installed in the bypass pipe may be further included.

If the dust concentration in the indoor space detected by the dust sensor is below the standard concentration, the bypass damper is opened so that the air in the mixing chamber can be supplied to the indoor space (R) after bypassing the filter.

According to the solution described above, optimal ventilation volume control of the air conditioning system can be achieved by considering indoor temperature and humidity information and air quality information as well as cooling and heating capacity.

In addition, by adjusting the cooling and heating capacity according to the ventilation amount, it is possible to prevent the cooling and heating capacity from being lowered when the ventilation amount is high or the cooling and heating capacity from being unnecessarily increased when the ventilation amount is low.

In addition, considering the outdoor air information transmitted through the server and the indoor air information recognized through sensors in the indoor space, indoor air quality can be improved by controlling the ventilation flow path and ventilation amount.

In addition, efficient and economical operation of the air conditioning system is possible by optimally controlling the target pressure of the outdoor unit by considering information on changes in indoor air due to ventilation.

1 is a schematic diagram showing the configuration of an air conditioning system according to an embodiment of the present invention.
2 and 3 are flow charts showing a control method of an air conditioning system according to an embodiment of the present invention.
Figure 4 is a graph showing an example of control that changes the amount of air supplied indoors in an office according to changes in dust concentration indoors and outdoors.

Hereinafter, some embodiments of the present invention will be described in detail through illustrative drawings. When adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, when describing embodiments of the present invention, if detailed descriptions of related known configurations or functions are judged to impede understanding of the embodiments of the present invention, the detailed descriptions will be omitted.

Additionally, when describing the components of an embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, or order of the component is not limited by the term. When a component is described as being "connected," "coupled," or "connected" to another component, that component may be directly connected or connected to that other component, but there is no need for another component between each component. It should be understood that may be “connected,” “combined,” or “connected.”

1 is a schematic diagram showing the configuration of an air conditioning system according to an embodiment of the present invention.

Referring to FIG. 1, the air conditioning system 10 according to an embodiment of the present invention supplies conditioned air to the indoor space (R) and can perform ventilation by introducing outdoor air and exhausting indoor polluted air. It can be configured so that

The air conditioning system 10 includes an exhaust pipe 20 that is connected to the indoor space R and extends to the outside of the building to discharge air from the indoor space R to the outside. An exhaust fan 25 that generates blowing force may be connected to the exhaust pipe 20. Additionally, an exhaust damper 22 that is controlled to open or close the exhaust pipe 20 may be installed in the exhaust pipe 20 .

The air conditioning system 10 further includes an external pipe 30 that guides the introduction of external air. The external pipe 30 extends from the outer wall of the building, etc., and may be connected to the air conditioner 100. An external air damper 32 that is controlled to open or close the external pipe 20 may be installed in the external pipe 30.

The air conditioning system 10 further includes an exhaust pipe 40 that branches off from the exhaust pipe 20 and extends to the air conditioner 100. At least some of the air flowing through the exhaust pipe 20 may be bypassed from the exhaust pipe 40 and supplied to the air conditioner 100. An external air damper 32 that is controlled to open or close the external pipe 20 may be installed in the external pipe 40.

In the air conditioner 100, a mixing chamber 112 may be formed in which outdoor air flowing through the external pipe 30 and air flowing through the return pipe 40 are mixed. The mixing chamber 112 may form a space having a predetermined size. Additionally, a filter 110 for purifying the mixed air may be installed in the mixing chamber 112.

The air conditioner 100 is further provided with a heat exchange chamber 114 that is partitioned from the mixing chamber 112. The mixing chamber 112 and the heat exchange chamber 114 are partitioned by a partition wall, and a communication hole through which air of the mixing chamber 112 can pass may be formed in the partition wall. Additionally, the filter 110 may be installed in the communication port.

The air conditioner 100 further includes a bypass pipe 140 connected to the outside of the mixing chamber 112 and extending to the heat exchange chamber 114. The bypass pipe 140 guides the air in the mixing chamber 112 to bypass the filter 110 and flow into the heat exchange chamber 114.

A bypass damper 142 that is controlled to open or close the bypass pipe 140 may be installed in the bypass pipe 140. When the bypass damper 142 is turned on, the air in the mixing chamber 112 may flow into the heat exchange chamber 114 through the bypass pipe 140 without passing through the filter 110.

A heat exchange coil 120 may be installed in the heat exchange chamber 114. The heat exchange coil 120 may cool or heat air introduced into the heat exchange chamber 114. The heat exchange coil 120 is connected to the outdoor unit 60, and refrigerant can circulate between the outdoor unit 60 and the heat exchange coil 120.

The outdoor unit 60 may include a compressor 61 and an outdoor fan 65. The compressor 61 may be an inverter compressor capable of frequency adjustment. The target pressure of the refrigerant cycle can be adjusted by adjusting the operating frequency of the compressor 61 or by adjusting the rotation speed of the outdoor fan 65. Accordingly, the outdoor unit 60 may be configured as a “capacity variable outdoor unit” capable of varying cooling and heating capabilities.

The air conditioner 100 may further include a supply chamber 116 communicating with the heat exchange chamber 114. The heat exchange chamber 114 and the supply chamber 116 may be partitioned by a partition wall or may be integrally formed as one chamber.

A supply fan 130 driven to supply air to the indoor space (R) may be installed in the supply chamber 116. Air conditioned in the heat exchange chamber 114 may be discharged to the outside of the air conditioner 100 through the supply fan 130.

The air conditioning system 10 further includes a supply pipe 50 connected to the air conditioner 100 and extending to the indoor space R. The supply pipe 50 is in communication with the supply chamber 116, and can supply air discharged from the supply chamber 116 to the indoor space (R). For example, the supply pipe 50 may be connected to the ceiling of the indoor space (R).

A diffuser 60 may be installed in the indoor space (R). The diffuser 60 communicates with the supply pipe 50 and, for example, may be installed on the ceiling of the indoor space (R). The diffuser 60 can diffuse the air flowing through the supply pipe 50 and supply it to the indoor space (R).

The air conditioning system 10 further includes an exhaust port 65 communicating with the exhaust pipe 20. For example, the exhaust port 65 is provided on the ceiling of the indoor space (R), and the air in the indoor space (R) is discharged from the indoor space (R) through the exhaust port 65, The exhaust pipe 20 can flow.

The air conditioning system 10 may include multiple sensors. The plurality of sensors may include a temperature sensor 70 that detects the temperature of the indoor space and a humidity sensor 72 that detects the humidity of the indoor space. The temperature sensor 70 and humidity sensor 72 may be installed in the indoor space (R) or in the exhaust pipe (40). For example, the temperature sensor 70 and the humidity sensor 72 may be configured as separate sensor devices that respectively detect temperature and humidity, or may be configured as a single sensor device that detects temperature and humidity together. .

The plurality of sensors further include a sensor that detects air quality in the indoor space (R). The sensor may include a CO2 sensor 74 that detects the concentration of carbon dioxide in the indoor space (R) and a dust sensor 76 that detects the concentration of fine dust in the indoor space (R). For example, the dust sensor 76 may include a PM2.5 sensor (detecting particles with a diameter of 2.5 μm or less) or a PM1.0 sensor (detecting particles with a diameter of 1.0 μm or less), which are distinguished depending on the size of fine dust particles. there is.

The air conditioning system 10 further includes a controller 150 that controls the air conditioner 100, the outdoor unit 60, dampers 22, 32, 42, and blowing fans 25 and 130. In addition, the air conditioning system 10 further includes a server 200 that is electrically connected to the controller 150 or the outdoor unit 60 and transmits weather information.

The controller 150 operates the outdoor unit 60, the dampers 22, and 32 based on weather information transmitted from the server 200 or information detected by the plurality of sensors 70, 72, 74, and 76. , 42) and the operation of the blowing fans 25 and 130 can be controlled.

2 and 3 are flow charts showing a control method of an air conditioning system according to an embodiment of the present invention. 2 and 3, a control method of the air conditioning system 10 according to an embodiment of the present invention will be described.

The air conditioner 100 is turned on and the set temperature of the indoor space (R) can be set. The set temperature can be input through the controller 150. Then, cooling or heating operation of the air conditioner 100 may be performed. When the air conditioner 100 performs a cooling operation, the air is heated in the heat exchange coil 120, and when the heating operation is performed, the air may be cooled in the heat exchange coil 120 (S11).

External weather information can be received from the server 200. The outside weather information may include outside air temperature and outside air humidity information. It is recognized whether the difference between the outside temperature and the indoor set temperature is within the standard temperature value (S12).

If the difference between the outside temperature and the indoor set temperature is within the reference temperature value, control to increase the ventilation amount of the indoor space (R) can be performed. For example, the outside air damper 32 is opened beyond the set opening degree, and the supply fan 130 is operated to introduce outside air through the outside pipe 20. In addition, the rotation speed of the supply fan 130 is controlled to exceed the standard rotation speed, so that the amount of outdoor air introduced becomes more than the set amount, and the amount of air supplied indoors through the supply pipe 50 can be increased. This control can be performed during the first set time.

In addition, with the introduction of outside air, the exhaust fan 25 is driven so that the air in the indoor space (R) flows through the exhaust pipe 20, and the return damper 42 is opened so that at least some of the exhausted air flows through the return pipe 40. ) may flow into the air conditioner 100 (S13).

On the other hand, if the difference between the outside temperature and the indoor set temperature is greater than or equal to the reference temperature value, control can be performed to reduce or block the ventilation amount of the indoor space (R). For example, if the outside air temperature is too high during the cooling operation of the air conditioner 100, or the amount of outside air introduced is too high while the outside air temperature is too low during the heating operation, the indoor space (R ) may increase, causing a problem in which the cooling and heating capacity of the air conditioner 100 is reduced.

Therefore, if the difference between the outside air temperature and the indoor set temperature is greater than or equal to the reference temperature value, control can be performed to reduce or block the amount of outside air introduced. To this end, the outdoor air damper 32 may be opened or blocked below a set opening degree. In addition, the rotation speed of the supply fan 130 is controlled to be less than the standard rotation speed, so that the amount of outdoor air introduced becomes less than the set amount, and the amount of air supplied indoors through the supply pipe 50 can be reduced. This control is carried out in accordance with the first setting. It can be done over time. The first set time can be determined within 1 hour.

In addition, with the introduction of outside air, the exhaust fan 25 is driven so that the air in the indoor space (R) flows through the exhaust pipe 20, and the return damper 42 is opened so that at least some of the exhausted air flows through the return pipe 40. ) may flow into the air conditioner 100 (S14).

When the first set time has elapsed, ventilation operation control according to the indoor humidity may be performed. It is recognized whether the indoor humidity detected by the humidity sensor 72 is within a comfortable humidity range, for example, 40 to 70%. For example, the comfortable humidity range during cooling operation can be determined to be within the range of 40 to 50%, and the comfortable humidity range during heating operation can be determined to be within the range of 50 to 70% (S15).

If the indoor humidity is within the comfortable humidity range, control can be performed to increase the amount of introduced outdoor air. In the outdoor air volume increase control, as described above, the outdoor air damper 32 is opened beyond the set opening degree, and the rotation speed of the supply fan 130 is controlled above the standard rotation speed, so that the introduced outdoor air volume becomes more than the set amount and the indoor air volume increases. The supply air volume can be increased. This control can be performed during the second set time (S16).

On the other hand, if the indoor humidity is outside the comfortable humidity range, control may be performed to reduce or block the amount of external air introduced. As described above, the outdoor air volume reduction control opens or blocks the outdoor air damper 32 below the set opening degree, and the rotation speed of the supply fan 130 is controlled below the standard rotation speed, so that the introduced outdoor air volume is below the set amount. This can result in the indoor air supply volume being reduced. This control may be performed during the second set time. The second set time can be determined within 1 hour (S17).

When the second set time has elapsed, ventilation operation according to the air quality of the indoor space may be performed. In detail, the carbon dioxide concentration in the indoor space (R) can be detected through the CO2 sensor 74. If the indoor carbon dioxide concentration exceeds the standard concentration, control can be performed to increase the amount of outdoor air introduced. In the outdoor air volume increase control, as described above, the outdoor air damper 32 is opened beyond the set opening degree, and the rotation speed of the supply fan 130 is controlled above the standard rotation speed, so that the introduced outdoor air volume can be more than the set amount. there is. This control can be performed during the third set time (S18, S19).

On the other hand, when the indoor carbon dioxide concentration does not exceed the standard concentration, control can be performed to reduce or block the amount of outdoor air introduced. As described above, the outdoor air volume reduction control opens or blocks the outdoor air damper 32 below the set opening degree, and the rotation speed of the supply fan 130 is controlled below the standard rotation speed, so that the introduced outdoor air volume is below the set amount. This can result in the indoor air supply volume being reduced. This control can be performed during a third set time. The third set time can be determined within 1 hour (S20).

When the third set time has elapsed, ventilation operation can be performed according to the dust concentration in the indoor space. In detail, the fine dust concentration in the indoor space (R) is detected through the dust sensor 76, and information about the outdoor dust concentration can be received from the server 200.

When the indoor fine dust concentration exceeds the standard concentration and the outdoor fine dust concentration is detected to be below the standard concentration, an air purification operation mode may be performed. In detail, the air purification operation mode may include control to adjust the flow path so that the mixed air of outdoor air and return air passes through the filter 110, along with control of increasing the amount of outdoor air.

In the outdoor air volume increase control, as described above, the outdoor air damper 32 is opened beyond the set opening degree, and the rotation speed of the supply fan 130 is controlled above the standard rotation speed, so that the introduced outdoor air volume is greater than the set amount. You can. Then, the bypass damper 142 is blocked so that the air in the mixing chamber 112 passes through the filter 110 and then flows into the heat exchange chamber 114. Accordingly, the mixed air can be purified by the filter 110 and then supplied to the indoor space (R). This control can be performed during the fourth set time (S21, S22).

On the other hand, if the outdoor dust concentration exceeds the standard concentration, the introduction of outdoor air can be blocked by blocking the outdoor air damper 32 (S23, S24).

Additionally, if the outdoor dust concentration and indoor dust concentration are below the standard concentration, a bypass operation mode may be performed. In detail, the bypass operation mode may include control to reduce or block the amount of outdoor air introduced, as well as control to adjust the flow path so that the mixed air of outdoor air and return air does not pass through the filter 110.

As described above, the outdoor air volume reduction control opens or blocks the outdoor air damper 32 below the set opening degree, and the rotation speed of the supply fan 130 is controlled below the standard rotation speed, so that the introduced outdoor air volume is below the set amount. This can result in the indoor air supply volume being reduced. Then, the bypass damper 142 is opened so that the air in the mixing chamber 112 bypasses the filter 110 and flows into the heat exchange chamber 114. Accordingly, the mixed air is prevented from experiencing pressure loss in the process of passing through the filter 110, and can be supplied to the indoor space (R) (S25).

Control of S24 and S25 can be performed during the fourth set time. For example, the fourth set time may be determined within 1 hour.

After the fourth set time has elapsed, optimal control can be performed to adjust the target pressure of the outdoor unit. In detail, when the ventilation operation is linked with the cooling or heating operation, the indoor air quality can be improved and the temperature and humidity of the indoor air can be changed.

The outdoor unit 60 can control the operating frequency of the compressor 61 to adjust the high pressure (target condensation pressure) or low pressure (target evaporation pressure) of the refrigerant cycle based on the currently sensed indoor temperature and indoor humidity. .

For example, when the cooling operation of the air conditioner 100 is performed while the indoor temperature is higher than the set temperature, if the indoor humidity is within the range of comfortable humidity, the latent heat load in the room is low, so it is necessary to produce a relatively high cooling capacity. decreases. Therefore, the operating frequency of the compressor 61 can be reduced from the set frequency to increase the low pressure (target evaporation pressure). For example, the set frequency is 45 Hz and the operating frequency of the compressor 61 can be determined in the range of 30 to 45 Hz.

On the other hand, when the indoor humidity exceeds the comfortable humidity, the latent heat load inside the room is high, so the need for relatively high cooling capacity increases. Therefore, the operating frequency of the compressor can be increased from the set frequency to lower the low pressure (target evaporation pressure). For example, the set frequency is 45Hz and the operating frequency of the compressor 61 can be determined in the range of 45 to 60Hz.

Meanwhile, when the heating operation of the air conditioner 100 is performed while the indoor temperature is lower than the set temperature, if the indoor humidity is within the range of comfortable humidity, the latent heat load in the room is low, so it is necessary to produce a relatively high heating capacity. It becomes less. Therefore, the operating frequency of the compressor can be reduced from the set frequency to lower the high pressure (target condensation pressure). For example, the set frequency is 45 Hz and the operating frequency of the compressor 61 can be determined in the range of 30 to 45 Hz.

On the other hand, when the indoor humidity is lower than the comfortable humidity, the latent heat load inside the room is high, so the need for relatively high heating capacity increases. Therefore, the operating frequency of the compressor can be increased from the set frequency to increase the high pressure (target condensation pressure). For example, the set frequency is 45Hz and the operating frequency of the compressor 61 can be determined in the range of 45 to 60Hz.

In addition, when the operating frequency of the compressor 61 is increased from the set frequency during cooling and heating operation of the air conditioner 100, the rotation speed of the outdoor fan 65 becomes more than the set rotation speed, and the operating frequency of the compressor 61 is increased. When reduced from the set frequency, the rotation speed of the outdoor fan 65 may become less than the set rotation speed (S26).

The above optimal control of ventilation and target pressure can be repeatedly performed until a power OFF command of the air conditioner 100 is input (S27).

As above, the outdoor unit 60 can be operated in consideration of cooling and heating capacity along with ventilation operation according to the indoor temperature and humidity, and the air quality of the indoor air, thereby improving indoor air quality and preventing the phenomenon of cooling and heating capacity being deteriorated due to ventilation amount control. It can be prevented.

Another embodiment is proposed.

2 and 3, the first ventilation control according to the indoor temperature, the second ventilation control according to the indoor humidity, the third ventilation control according to the indoor carbon dioxide concentration, and the fourth ventilation control according to the indoor dust concentration are sequentially performed. As described, the order of the first to fourth ventilation controls may be formed differently.

For example, when the demand for cooling or heating is high, that is, when the external temperature and humidity are too high or low, the 1st and 2nd ventilation control according to temperature/humidity are performed first, and then the 3rd and 4th ventilation as shown in Figures 2 and 3. Control can be performed later

However, when the demand for air quality improvement is high, that is, when the indoor carbon dioxide concentration and fine dust concentration are too high, unlike Figures 2 and 3, the 3rd and 4th ventilation controls are performed first, and then the 1st and 2nd ventilation controls are performed. You might be able to do it.

Figure 4 is a graph showing an example of control that changes the amount of air supplied indoors in an office according to changes in dust concentration indoors and outdoors.

In the graph of Figure 4, the horizontal axis shows the passage of time from coming to work at the company's office (9:00) until leaving work (20:00), and the vertical axis shows changes in indoor and outdoor dust concentrations.

In addition, the indoor air volume supplied to the air conditioning system 10 can be changed according to changes in indoor and outdoor dust concentrations. Here, the outdoor dust concentration can be understood as changing in steps S21 to S25 of 3 without exceeding the standard concentration. The standard concentration on the vertical axis of FIG. 4 is the standard concentration of indoor space and may be, for example, 35 μg/m ³ .

If the indoor dust concentration is below the standard concentration, ventilation of the indoor space may not be performed. Then, as approximately 15:00 approaches and the indoor dust concentration begins to exceed the standard concentration, the supply fan 130 is operated at a low speed to perform a weak wind operation so that weak wind can be supplied to the indoor space.

In the process of performing the weak wind operation, when the indoor dust concentration increases, the supply fan 130 is operated at high speed and performs a strong wind operation so that strong wind can be supplied to the indoor space.

In the process of performing the strong wind operation, if the indoor dust concentration falls below the standard concentration, the supply fan 130 performs the weak wind operation again. Additionally, when time passes and it is time to leave work after 20:00, the ventilation operation of the air conditioning system can be stopped. According to this control method, efficient ventilation operation can be achieved in the case of a company where employees are present only during certain periods of the day.

10: air conditioning system 20: exhaust pipe
30: external organ 40: external organ
50: supply pipe 60: outdoor unit
70,72,74,76: Sensor 100: Air conditioner
110: filter 112: mixing chamber
114: heat exchange chamber 116: supply chamber
120: heat exchange coil 130: supply fan
150: Controller 200: Server

Claims (14)

It includes a supply pipe that supplies air to the indoor space (R), an exhaust pipe that exhausts air from the indoor space (R), an exterior pipe that introduces outdoor air, and a return pipe branched from the exhaust pipe,
A method for controlling an air conditioning system further comprising an air conditioner in which the supply pipe, the external pipe, and the return pipe are connected, a heat exchange coil connected to an outdoor unit, a filter, and a supply fan are installed,
Recognizing a difference between the set temperature of the indoor space and the temperature of the outdoor air, and determining whether to increase or decrease the amount of outdoor air introduced through the outdoor pipe;
detecting the carbon dioxide concentration in the indoor space and determining an increase or decrease in the amount of outdoor air introduced through the external pipe;
detecting the dust concentration in the indoor space and determining an increase or decrease in the amount of outdoor air introduced through the external pipe; and
It includes changing the operating frequency of the compressor provided in the outdoor unit based on the temperature and humidity of the indoor space,
When the air conditioner performs a cooling operation while the temperature of the indoor space is higher than the set temperature, if the humidity of the indoor space is within the range of comfortable humidity, the operating frequency of the compressor provided in the outdoor unit is reduced from the set frequency. to increase the target evaporation pressure,
A control method of an air conditioning system that lowers the target evaporation pressure by increasing the operating frequency of the compressor beyond the set frequency when the humidity of the indoor space exceeds the comfortable humidity. According to claim 1,
If the difference between the set temperature of the indoor space and the temperature of the outside air is within the reference temperature value, the amount of outside air introduced through the outside pipe is increased during the first set time,
Air conditioning, characterized in that when the difference between the set temperature of the indoor space and the temperature of the outdoor air exceeds the reference temperature value, the amount of outdoor air introduced through the outdoor pipe is reduced or the introduction of outdoor air is blocked during the first set time. System control method. According to claim 1,
A control method for an air conditioning system further comprising determining an increase or decrease in the amount of outdoor air introduced through the external pipe based on whether the humidity of the indoor space is within a comfortable humidity range. According to claim 3,
If the humidity of the indoor space is within the comfortable humidity range, the amount of outdoor air introduced through the external pipe is increased during a second set time,
When the humidity of the indoor space is outside the comfortable humidity range, the control method of an air conditioning system, characterized in that, reducing the amount of outdoor air introduced through the external pipe or blocking the introduction of outdoor air during the second set time. According to claim 1,
If the carbon dioxide concentration in the indoor space exceeds the standard concentration, the amount of outdoor air introduced through the external pipe is increased for a third set time,
If the carbon dioxide concentration in the indoor space is below the standard concentration, the control method of an air conditioning system, characterized in that, reducing the amount of outdoor air introduced through the external pipe or blocking the introduction of outdoor air during the third set time. According to claim 1,
If the dust concentration in the indoor space exceeds the standard concentration and the outdoor dust concentration is below the standard concentration, the amount of outdoor air introduced through the outdoor pipe is increased for a fourth set time and the flow path is controlled so that the outdoor air passes through the filter,
A control method for an air conditioning system, characterized in that when the outdoor dust concentration exceeds the standard concentration, the introduction of outdoor air is blocked for the fourth set time. According to claim 6,
If the dust concentration in the indoor space and the outdoor dust concentration are respectively less than the standard concentration, the outdoor air introduced through the external pipe during the fourth set time bypasses the filter and is supplied to the indoor space. System control method. delete According to claim 1,
When the heating operation of the air conditioner is performed while the temperature of the indoor space is lower than the set temperature, if the humidity of the indoor space is within the range of comfortable humidity, the operating frequency of the compressor provided in the outdoor unit is reduced from the set frequency. to lower the target condensation pressure,
A control method for an air conditioning system, characterized in that when the humidity of the indoor space is lower than the comfortable humidity, the operating frequency of the compressor is increased to a set frequency to increase the target condensation pressure. According to clause 9,
During cooling or heating operation of the air conditioner,
When the operating frequency of the compressor is increased beyond the set frequency, the rotation speed of the outdoor fan provided in the outdoor unit becomes more than the set rotation speed,
A control method of an air conditioning system wherein when the operating frequency of the compressor is reduced from the set frequency, the rotation speed of the outdoor fan becomes less than the set rotation speed. a supply pipe that supplies air to the indoor space (R), an exhaust pipe that exhausts air from the indoor space (R), an exterior pipe that introduces outside air, and a return pipe branched from the exhaust pipe;
An air conditioner including a mixing chamber in which the external pipe and the external pipe are connected and in which air flowing through the external pipe and the external pipe is mixed, a heat exchange chamber in which a heat exchange coil is installed, and a supply chamber in which a supply fan is installed;
an outdoor unit connected to the heat exchange coil and equipped with a compressor;
A temperature sensor that detects the temperature of the indoor space (R);
a humidity sensor that detects the humidity of the indoor space (R) and is integrated with the temperature sensor or is configured as a separate device;
A CO2 sensor that detects the carbon dioxide concentration in the indoor space (R);
A dust sensor that detects the concentration of fine dust in the indoor space (R); and
Controlling to increase or decrease the amount of outdoor air introduced through the external pipe based on information detected by the temperature sensor, the humidity sensor, the CO2 sensor, and the dust sensor,
When the air conditioner performs a cooling operation while the temperature of the indoor space is higher than the set temperature, if the humidity of the indoor space is within the range of comfortable humidity, the operating frequency of the compressor provided in the outdoor unit is reduced from the set frequency. to increase the target evaporation pressure,
An air conditioning system comprising a controller that lowers the target evaporation pressure by increasing the operating frequency of the compressor above the set frequency when the humidity of the indoor space exceeds the comfortable humidity. delete According to claim 11,
The controller is,
An air conditioning system that increases or decreases the operating frequency of the compressor based on whether the humidity of the indoor space detected by the humidity sensor is within a comfortable humidity range. According to claim 11,
A filter provided in the mixing chamber;
a bypass pipe extending from the mixing chamber to the heat exchange chamber and guiding air in the mixing chamber to bypass the filter; and
A bypass damper installed in the bypass pipe is further included,
If the dust concentration in the indoor space detected by the dust sensor is below the standard concentration, the bypass damper is opened and the air in the mixing chamber bypasses the filter and is supplied to the indoor space (R).

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