KR101769454B1 - Outdoor air introduction system and control method of the same - Google Patents

Abstract

According to the present invention, when CO_2 concentration of indoor air exceeds predetermined concentration, an indoor air damper, an outdoor air damper, and a circulation air damper are opened in accordance with predetermined opening and closing time. Even though CO_2 concentration of the indoor air is less than the predetermined concentration, considering enthalpy, the indoor air damper, the outdoor air damper, and the circulation air damper are opened to introduce outdoor air. Therefore, energy can be reduced through outdoor air cooling with the outdoor air.

Description

[0001] The present invention relates to an outdoor air introduction system and a control method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an outdoor air introduction system and a control method thereof, and more particularly, to an outdoor air introduction system and a control method thereof that can reduce energy by introducing outdoor air in consideration of CO ₂ concentration and enthalpy .

Generally, air conditioning facilities are installed in various buildings including office buildings, factories, hotels, restaurants, hospitals, and department stores. When the operation of the air conditioner is performed by the manager's judgment, unnecessary operation for a long time or all day may be performed, resulting in waste of energy.

Recently, a method for controlling the operation of the air conditioner has been continuously studied. When air-conditioning is performed in accordance with occupants, air-conditioning starts before the start time of the room, but since the start time is generally determined based on the hottest weather in summer and the coldest in winter, it is unnecessary There is a problem that the air conditioning starts early and energy is wasted.

However, there is a problem in that energy can be wasted due to introduction of outside air during operation of the air conditioner, and it is difficult to appropriately control the amount of outside air introduced according to the indoor conditions .

Korean Patent Publication No. 10-2011-0100895

An object of the present invention is to provide an outside air introduction system and a control method thereof that can secure both indoor air quality improvement and energy saving.

The outdoor air introducing system according to the present invention includes an indoor CO ₂ sensor installed in an indoor air discharge duct for discharging indoor air to the outside and measuring the CO ₂ concentration of indoor air, an indoor temperature sensor for measuring indoor air temperature, An indoor air sensor unit including an indoor humidity sensor for measuring a relative humidity of indoor air; An outside air sensor unit installed in an outside air inflow duct for introducing outside air into the room, the outside air sensor unit including an outside air temperature sensor for measuring the temperature of the outside air and an outside air humidity sensor for measuring the relative humidity of the outside air; An indoor air damper installed in the indoor air discharge duct to adjust a discharge flow rate of indoor air; An outside air damper installed in the outside air inflow duct and opened and closed by interlocking with the indoor air damper to regulate inflow flow rate of the outside air; A circulation air damper installed in a circulation air duct connecting the indoor air discharge duct and the outdoor air inflow duct to regulate a flow rate of circulated air circulated through the circulation air duct; If the CO ₂ concentration measured by the indoor CO ₂ sensor during operation of the air conditioner exceeds a preset set concentration, CO _2, which opens the room air damper, the air damper and the circulated air damper according to the switching time preset And when the CO ₂ concentration measured by the indoor CO ₂ sensor is equal to or lower than a predetermined set concentration, the enthalpy of the indoor air and the enthalpy of the outdoor air are compared. If the enthalpy of the indoor air is larger than the enthalpy of the outdoor air And an enthalpy control mode for opening the indoor air damper, the outside air damper, and the circulating air damper.

According to the present invention, when the CO ₂ concentration of the indoor air exceeds the preset concentration, the indoor air damper, the outside air damper, and the circulating air damper are opened according to the preset opening and closing timing, and even if the CO ₂ concentration of the indoor air is lower than the set concentration, The indoor air damper, the outside air damper, and the circulating air damper are opened to introduce outside air, so that energy can be saved through outdoor air cooling using outside air.

1 is a view showing a configuration of an outside air introduction system according to an embodiment of the present invention.
2 is a control block diagram of an outside air introduction system according to an embodiment of the present invention.
3 is a flowchart showing a control method when the outdoor air introduction system according to the embodiment of the present invention is in a cooling operation mode or a mid-term operation mode.
4 is a flowchart showing a control method when the outdoor air introduction system according to the embodiment of the present invention is in the heating operation mode.
FIG. 5 is a view of a humidifier according to an embodiment of the present invention, showing conditions for introducing outside air into the outside air introduction system.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a view showing a configuration of an outside air introduction system according to an embodiment of the present invention. 2 is a control block diagram of an outside air introduction system according to an embodiment of the present invention.

1 and 2, an outdoor air introducing system according to an embodiment of the present invention includes an indoor air exhaust duct 10, an outdoor air inflow duct 20, a circulating air duct 30, an indoor air sensor unit, A room air damper 110, an outside air damper 120, a circulating air damper 130, an indoor air blowing fan 15, an outside air blowing fan 25, a heating / cooling coil 40, a humidifying device 50, And a control unit (100).

The indoor air discharge duct (10) is connected to an indoor space provided with the air conditioner (2), and is a duct formed to discharge indoor air to the outside.

The outside air inlet duct 20 is connected to the inside space and is configured to introduce outside air into the inside space.

The circulating air duct 30 is formed to connect the indoor air discharge duct 10 and the outdoor air inlet duct 20 so that at least a part of the indoor air discharged from the indoor space is connected to the outdoor air inlet duct 20, .

The indoor air sensor unit is installed inside the indoor air discharge duct (10). The indoor air sensor unit includes an indoor CO ₂ sensor 13 for measuring a CO ₂ concentration of indoor air, an indoor temperature sensor 11 for measuring indoor air temperature, an indoor humidity sensor (12).

The outside air sensor unit is installed inside the outside air inlet duct 20. The outside air sensor unit includes an outside air temperature sensor 21 for measuring the temperature of the outside air and an outside air humidity sensor 22 for measuring the relative humidity of the outside air.

The indoor air damper (110) is installed inside the indoor air discharge duct (10) to regulate the discharge flow rate of indoor air.

The outside-air damper 120 is installed inside the outside-air inflow duct 20 to regulate inflow flow rate of outside air.

The circulating air damper 130 is installed inside the circulating air duct 30. The circulating air damper 130 regulates the flow rate of the circulating air circulated through the circulating air duct in the room air.

At least two of the indoor air damper 110, the outdoor air damper 120, and the circulating air damper 130 are opened and closed in association with each other. In the present embodiment, the indoor air damper 110, the outside air damper 120, and the circulating air damper 130 are provided with motors, and the motors are operated simultaneously according to the same control signal. For example, do. However, the present invention is not limited thereto, and the indoor air damper 110, the outside air damper 120, and the circulating air damper 130 may be simultaneously driven by a single motor.

The indoor air blowing fan (15) is installed in the indoor air ventilation duct (10) to blow indoor air.

The outside air blowing fan (25) is installed in the outside air inflow duct (20) to blow outside air. The outside air blowing fan 25 is installed on the downstream side of the heating / cooling coil 40 and the humidifying device 50 described later in the outside air inflow duct 20.

The indoor air blowing fan (15) and the outdoor air blowing fan (25) are operated simultaneously with the start of cooling and heating in the summer and winter in which cooling and heating are performed, and the cooling is performed in the middle period by using outside air.

The heating / cooling coil 40 is installed on a downstream side of a point where the circulating air duct 30 is connected to the outside air inflow duct 20 to heat or cool the mixed air in which outside air or circulating air is mixed. And cooled.

The humidifying device 50 is installed on the downstream side of the heating / cooling coil 40 in the outside air inlet duct 20 to humidify outside air or mixed air.

A mixed air temperature sensor (31) for measuring the temperature of the mixed air is installed in the outside air inlet duct (20).

The mixed air temperature sensor 31 is installed at a point where the circulating air duct 30 is connected to the outside air inlet duct 20 or downstream of a point where the circulating duct 30 is connected. However, the present invention is not limited to this, and the mixed air temperature sensor 31 may be installed in the circulating air duct 30.

The control unit 100 controls the operation of the indoor air damper 110, the outside air damper 120 and the circulating air damper 130 according to the values measured by the indoor air sensor unit and the outdoor air sensor unit .

The control unit 100 compares the CO ₂ concentration measured by the indoor CO ₂ sensor with a predetermined set concentration at the time of operation of the air conditioner and controls the indoor air damper 110 and the outside air damper 120 ), And controls the operation of the circulating air damper (130).

That is, the controller 100 performs a predetermined CO ₂ concentration control mode when the CO ₂ concentration measured by the indoor CO ₂ sensor exceeds a predetermined set concentration. The CO ₂ concentration control mode is a mode for controlling the operation of the indoor air damper 100, the outdoor air damper 120, and the circulating air damper 130 according to a preset opening and closing time. That is, the opening and closing points of the indoor air damper 100, the outdoor air damper 120, and the circulating air damper 130 are preset.

Meanwhile, when the CO ₂ concentration measured by the indoor CO ₂ sensor is lower than a predetermined set concentration, the controller 100 compares the enthalpy of the indoor air and the enthalpy of the outdoor air, and performs a predetermined enthalpy control mode accordingly. That is, even if the CO ₂ concentration of the indoor air is lower than a predetermined set concentration, the enthalpy control mode may be set to a lower level than the indoor air damper 100, the outside air damper 120 and the circulating air damper 130 to reduce energy by introducing outside air.

The enthalpy control mode is set to be controlled differently depending on an intermediate period including spring and autumn, summer season, or winter season. In the present embodiment, the middle and the summer including spring and autumn are set to be the same, and the winter and the winter are set differently. In the enthalpy control mode, it is also possible to select the seasonal mode at the start of control, and it may be set according to whether the air conditioner is in the cooling operation mode or the heating operation mode.

In the enthalpy control mode, when the enthalpy of the indoor air is larger than the enthalpy of the outdoor air even if the CO ₂ concentration of the indoor air is low, energy can be saved by entering the outdoor air in the middle of summer, spring, . Also, during the winter time, the cooling load can be generated due to the internal heating load through the window and the internal heating load during the daytime, so that the energy can be saved by flowing the outside air and cooling the outside air.

A control method of the outside air introduction system according to the embodiment of the present invention will be described as follows.

3 is a flowchart showing a control method when the outdoor air introduction system according to the embodiment of the present invention is in a cooling operation mode or a mid-term operation mode.

Referring to FIG. 3, a control method will be described in the mid-season driving mode in spring and autumn and in the summer cooling driving mode.

When the control of the outside air introduction system is started, the season mode is first set (S1)

The seasonal mode includes a spring and autumn mid-term driving mode, a summer cooling driving mode, and a winter heating driving mode. The seasonal mode may be automatically set according to the operation mode of the air conditioner, may be directly input by the user, or may be set according to the outdoor air temperature measured by the outdoor air sensor unit.

The indoor CO ₂ sensor 13 measures the CO ₂ concentration of the indoor air (S2) (S3)

At this time, when the indoor air blowing fan 15 is operated and the indoor air flows into the indoor air discharge duct 10, the indoor CO ₂ sensor 13 can measure the CO ₂ concentration of the indoor air.

The controller 100 compares the CO ₂ concentration measured by the indoor CO ₂ sensor 13 with a preset concentration.

When the CO ₂ concentration measured by the indoor CO ₂ sensor 13 exceeds a predetermined set concentration, the controller 100 performs the CO ₂ concentration control mode. (S 19)

The CO ₂ concentration control mode is a mode for opening the indoor air damper 110, the outside air damper 120 and the circulating air damper 130 according to a predetermined opening and closing time. That is, the CO ₂ concentration control mode is a mode in which the opening and closing points of the indoor air damper 110, the outdoor air damper 120, and the circulating air damper 130 are preset. At this time, the room air damper 110, the outside air damper 120, and the circulating air damper 130 are all opened together and all are shielded together.

On the other hand, if the CO ₂ concentration measured by the indoor CO ₂ sensor 13 is less than a predetermined set concentration, the controller 100 performs the enthalpy control mode.

That is, in the present invention, even if the CO ₂ concentration of the indoor air is equal to or lower than the set concentration, the opening of the indoor air damper 110, the outside air damper 120, and the circulating air damper 130 is controlled can do. By controlling the opening of the damper in consideration of the enthalpy to introduce the outside air, the energy can be saved through the outside air cooling using the outside air.

When the enthalpy control mode is started, the indoor temperature sensor 11 measures the temperature of the indoor air, and the indoor humidity sensor 12 measures the relative humidity of the indoor air. The outside air temperature sensor 21 measures the temperature of the outside air, and the outside air humidity sensor 22 measures the relative humidity of the outside air. (S6)

The control unit 100 calculates the absolute humidity of the enthalpy and the outside air. (S7)

The enthalpy of the outside air and the enthalpy of the room air are calculated.

The method of calculating the enthalpy is expressed by Equation (1).

In the equation (1), c _a is the specific heat of the constant pressure of the dry air (1,005 J / kg · K, 0.240 kcal / kg · ° C), c _v is the specific heat of steam (1,846J / kg · K, 0.441 kcal / ), r ₀ represents latent heat of evaporation at 0 ° C (2,501 ㅧ 103J / kg, 597.5kcal / kg).

The method of calculating the absolute humidity (x) is shown in Equation (2).

Here, Pw represents the steam partial pressure.

The steam partial pressure can be obtained from Equation (3).

Where RH is the relative humidity (%) and P _ws is the saturated water vapor pressure (kPa).

The saturated water vapor pressure can be obtained by the following equation (4).

Where T _ab [k] = T + 273.15.

Equation (5) represents an equation for obtaining the atmospheric pressure.

Where P ₀ is the atmospheric pressure (= 101.325 kPa (760 mmHg), Z is the elevation above sea level (m), T _oab = 15 + 273.15 = 288.15K)

The controller 100 compares the enthalpy of the indoor air calculated above with the enthalpy of the outdoor air. (S8)

If the enthalpy of the room air is greater than the enthalpy of the outside air, the temperature of the outside air is compared with a preset room temperature (SAT). (S9)

If the enthalpy of the room air is larger than the enthalpy of the outside air, the outside air is introduced to cool the outside air to save energy, so that the temperature of the outside air is compared with a preset room temperature.

If the temperature of the outside air is lower than the room setting temperature, the absolute humidity of the outside air is compared with a preset indoor humidity setting (SAH).

If the absolute humidity of the outside air is lower than the indoor setting absolute humidity (SAH), a difference between the indoor air temperature and the indoor set temperature is calculated (S11)

Compares the difference between the indoor air temperature and the indoor set temperature, and controls the opening and closing of the dampers differently according to the comparison result.

That is, if the difference between the indoor set temperature (SAT) and the indoor air temperature (RAT) is equal to or less than a predetermined set minimum temperature difference, the indoor air damper 110, the outside- ) Is opened at a predetermined maximum opening degree (S12) (S13)

Here, the set minimum temperature difference is 5 DEG C and the maximum opening degree is 100%, for example.

If the difference between the indoor set temperature SAT and the indoor air temperature RAT exceeds the preset minimum temperature difference and is equal to or smaller than the preset maximum temperature difference, the indoor air damper 110, the outside air damper 120 And the circulating air damper 130 are proportionally opened according to a predetermined ratio (S14) (S15)

The proportional opening in accordance with the predetermined ratio is performed in accordance with the opening rate set in proportion to the difference between the indoor set temperature and the indoor air temperature.

The set maximum temperature difference is 10 deg. C, for example.

On the other hand, if the difference between the indoor set temperature (SAT) and the indoor air temperature (RAT) exceeds the preset maximum temperature of 10 ° C, the indoor air damper 110, the outside air damper 120, The damper 130 is opened at a predetermined minimum opening degree (S16) (S17)

Here, the minimum opening degree is set in advance.

When the enthalpy control mode is not started, the indoor air damper 110, the outside air damper 120, and the circulating air damper 130 are all blocked (S18)

Although the enthalpy control mode is mostly used, it is possible for the manager to select the use of the enthalpy control mode as necessary.

4 is a flowchart showing a control method when the outdoor air introduction system according to the embodiment of the present invention is in the heating operation mode.

Referring to FIG. 4, a control method in a winter heating operation mode will be described.

When the control of the outside air introduction system is started, the season mode is first set (S21)

When the heating operation mode is set, the indoor CO ₂ sensor 13 measures the CO ₂ concentration of the indoor air (S 22) (S 23)

At this time, when the indoor air blowing fan 15 is operated and the indoor air flows into the indoor air discharge duct 10, the indoor CO ₂ sensor 13 can measure the CO ₂ concentration of the indoor air.

The control unit 100 compares the CO ₂ concentration measured by the indoor CO ₂ sensor 13 with a predetermined set concentration (S 24)

When the CO ₂ concentration measured by the indoor CO ₂ sensor 13 exceeds a predetermined set concentration, the controller 100 performs the CO ₂ concentration control mode (S 38)

The CO ₂ concentration control mode is a mode for opening the indoor air damper 110, the outside air damper 120 and the circulating air damper 130 according to a predetermined opening and closing time. The CO ₂ concentration control mode is a mode in which the opening and closing points of the indoor air damper 110, the outdoor air damper 120, and the circulating air damper 130 are preset. At this time, the room air damper 110, the outside air damper 120, and the circulating air damper 130 are all opened together and all are shielded together.

On the other hand, if the CO ₂ concentration measured by the indoor CO ₂ sensor 13 is lower than a predetermined set concentration, the controller 100 performs an enthalpy control mode.

That is, in the present invention, even if the CO ₂ concentration of the indoor air is equal to or lower than the set concentration, the opening of the indoor air damper 110, the outside air damper 120, and the circulating air damper 130 is controlled can do. By controlling the opening of the damper in consideration of the enthalpy to introduce the outside air, the energy can be saved through the outside air cooling using the outside air.

When the enthalpy control mode is started, the indoor temperature sensor 11 measures the temperature of the indoor air, and the indoor humidity sensor 12 measures the relative humidity of the indoor air. The outside air temperature sensor 21 measures the temperature of the outside air and the outside air humidity sensor 22 measures the relative humidity of the outside air (S26)

The controller 100 compares the difference between the room air temperature RAT and a preset indoor temperature SAT with a predetermined set temperature difference at step S27.

Here, the set temperature difference is 2 [deg.] C for example. The indoor set temperature is set differently in the cooling operation mode and the heating operation mode.

If the difference between the room air temperature RAT and the preset indoor temperature SAT is equal to or greater than the preset temperature difference, the heating operation mode is stopped (S28)

If the difference between the room air temperature RAT and the preset indoor temperature SAT is equal to or greater than the preset temperature difference, it is determined that no further heating is required, and the heating operation of the air conditioner is stopped.

After the heating operation mode is stopped, the enthalpy of the room air and the enthalpy of the outside air are calculated (S29)

The control unit 100 compares the enthalpy of the indoor air with the enthalpy of the outdoor air. (S30)

If the enthalpy of the indoor air is larger than the enthalpy of the outdoor air, the operation of the humidifying device 50 is checked. (S31)

If the enthalpy of the indoor air is larger than the enthalpy of the outdoor air, it is determined that the outdoor air is required to be cooled, and the outdoor air can be introduced.

The control unit 100 compares the temperature of the mixed air measured by the mixed air temperature sensor 31 with a preset mixed air set temperature when the humidifier 50 is operating.

Here, the mixed air set temperature is 0 ° C, for example.

The indoor air damper 110, the outside air damper 120, and the circulating air damper 130 are connected to each other when the temperature of the mixed air measured by the mixed air temperature sensor 31 is equal to or higher than 0 ° C. And opens according to the opening ratio set to be proportional to the temperature of the mixed air. (S33)

On the other hand, if the temperature of the mixed air is less than the set air temperature of 0 ° C., the temperature of the indoor air damper 110 and the mixed air become 0 ° C. or higher, And controls the opening ratio of the damper 130 by changing the opening ratio. If the temperature of the mixed air is less than the set air temperature of 0 ° C., the temperature of the air flowing into the room is too low, so that the heating / cooling coil can be thawed. .

Equation (6) is an expression for controlling the opening ratio of the dampers until the temperature (MAT) of the mixed air becomes equal to or higher than 0 ° C, which is the mixed air set temperature.

Here, k is the opening ratio of the circulating air damper, and 1-k is the opening ratio of the outside air damper.

If it is determined in step S31 that the operation of the humidification apparatus is not operated, the dew point temperature (RDT) of the room air is calculated.

If the temperature of the outside air is lower than the dew point temperature of the room air in a state in which the humidifying device is not operated, condensation may occur at the time of introducing the outside air, so that the dew point temperature of the room air and the outside air temperature are compared.

The dew point temperature (RDT) (Tdp: ° C) of the indoor air is calculated by Equation (7).

 0.6112? Pw? 12.350 (at 0 to 50 ° C)

0.0039? Pw <0.6112 (at -50 to 0 ° C)

 Here, Y = loge (1,000 Pw).

After the dew point temperature of the room air is calculated, the temperature of the outside air and the dew point temperature of the room air are compared (S35)

If the temperature of the outside air is higher than the dew point temperature of the room air, a process of comparing the temperature of the mixed air with the set air temperature is performed (S32)

When the temperature of the mixed air measured by the mixed air temperature sensor 31 is equal to or higher than the mixed air set temperature, the indoor air damper 110, the outside air damper 120, and the circulating air damper 130 are mixed with the mixed air (S33). &Lt; tb &gt; &lt; sep &gt;

If the temperature of the mixed air is lower than the set air temperature, the temperature of the indoor air damper 110 and the mixed air become equal to or higher than the set air temperature, And controls the opening ratio of the damper 130 by changing the opening ratio.

When the enthalpy control mode is not started, the indoor air damper 110, the outside air damper 120, and the circulating air damper 130 are all blocked (S37)

As described above, during the opening control of the dampers, the CO ₂ concentration of the room air is continuously measured.

FIG. 5 is a view of a humidifier according to an embodiment of the present invention, showing conditions for introducing outside air into the outside air introduction system.

Referring to FIG. 5, the first region A and the third region C are regions in which the outside air can be introduced in the cooling operation mode or the intermediate operation mode.

That is, the first area A and the third area C are areas where the temperature of the outside air is equal to or lower than the indoor set temperature SAT and the absolute humidity of the outside air is equal to or less than the indoor set absolute humidity SAH .

The first area A, the second area B and the third area C are areas in which the outside air can be introduced when the humidification device is operated and the humidification device is operated in the heating operation mode.

When the humidification device is not operated and the humidification device is not operated, the outside air can be introduced into the first area (A) and the second area (B).

In the heating operation mode, when the humidification is not performed, the dampers are opened to introduce the outside air when the indoor air temperature is equal to or higher than the dew point temperature (RDT) of the room air, so that the area less than the dew point temperature (RDT) of the room air is excluded.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Indoor air exhaust duct 11: Room temperature sensor
12: indoor humidity sensor 13: indoor CO ₂ sensor
20: air inlet duct 21: outdoor temperature sensor
22: Ambient humidity sensor 30: Circulating air duct
31: mixed air temperature sensor 110: indoor air damper
120: Ambient air damper 130: Circulating air damper

Claims (11)

delete An indoor CO ₂ sensor installed in an indoor air discharge duct for discharging indoor air to the outside and measuring the CO ₂ concentration of indoor air, an indoor temperature sensor for measuring indoor air temperature, An indoor air sensor unit including an indoor humidity sensor;
An outside air sensor unit installed in an outside air inflow duct for introducing outside air into the room, the outside air sensor unit including an outside air temperature sensor for measuring the temperature of the outside air and an outside air humidity sensor for measuring the relative humidity of the outside air;
An indoor air damper installed in the indoor air discharge duct to adjust a discharge flow rate of indoor air;
An outside air damper installed in the outside air inflow duct and opened and closed by interlocking with the indoor air damper to regulate inflow flow rate of the outside air;
A circulation air damper installed in a circulation air duct connecting the indoor air discharge duct and the outdoor air inflow duct to regulate a flow rate of circulated air circulated through the circulation air duct;
If the CO ₂ concentration measured by the indoor CO ₂ sensor during operation of the air conditioner exceeds a preset set concentration, CO _2, which opens the room air damper, the air damper and the circulated air damper according to the switching time preset Performs the concentration control mode,
If the enthalpy of the indoor air and the enthalpy of the outdoor air are greater than the enthalpy of the outdoor air when the CO ₂ concentration measured by the indoor CO ₂ sensor is less than a predetermined set concentration, An air conditioner damper, and an enthalpy control mode for opening the circulating air damper,
Wherein,
The enthalpy of the indoor air is compared with the enthalpy of the outdoor air when the CO ₂ concentration measured by the indoor CO ₂ sensor is lower than a predetermined set concentration,
If the enthalpy of the room air is larger than the enthalpy of the outside air, the temperature of the outside air is compared with a preset room temperature,
If the temperature of the outside air is lower than the room set temperature, the absolute humidity of the outside air is compared with the predetermined room setting absolute humidity,
Calculating a difference between the indoor set temperature and the indoor air temperature when the absolute humidity of the outdoor air is lower than the indoor set absolute humidity,
And controls the opening of the indoor air damper, the outdoor air damper, and the circulating air damper according to a difference between the indoor set temperature and the indoor air temperature. The method of claim 2,
Wherein,
If the difference between the indoor set temperature and the indoor air temperature is equal to or less than a predetermined set minimum temperature difference,
Wherein the indoor air damper, the outdoor air damper, and the circulating air damper are opened at a predetermined maximum opening degree. The method of claim 3,
Wherein,
If the difference between the indoor set temperature and the indoor air temperature exceeds the set minimum temperature difference and is equal to or less than the set maximum temperature difference,
Wherein the indoor air damper, the outside air damper, and the circulating air damper are opened in accordance with the opening rate set in proportion to the difference between the indoor set temperature and the indoor air temperature. The method of claim 4,
Wherein,
If the difference between the indoor set temperature and the indoor air temperature exceeds the set maximum temperature difference,
Wherein the indoor air damper, the outdoor air damper, and the circulating air damper are opened at a predetermined minimum opening degree. delete An indoor CO ₂ sensor installed in an indoor air discharge duct for discharging indoor air to the outside and measuring the CO ₂ concentration of indoor air, an indoor temperature sensor for measuring indoor air temperature, An indoor air sensor unit including an indoor humidity sensor;
An outside air sensor unit installed in an outside air inflow duct for introducing outside air into the room, the outside air sensor unit including an outside air temperature sensor for measuring the temperature of the outside air and an outside air humidity sensor for measuring the relative humidity of the outside air;
An indoor air damper installed in the indoor air discharge duct to adjust a discharge flow rate of indoor air;
An outside air damper installed in the outside air inflow duct and opened and closed by interlocking with the indoor air damper to regulate inflow flow rate of the outside air;
A circulation air damper installed in a circulation air duct connecting the indoor air discharge duct and the outdoor air inflow duct to regulate a flow rate of circulated air circulated through the circulation air duct;
If the CO ₂ concentration measured by the indoor CO ₂ sensor during operation of the air conditioner exceeds a preset set concentration, CO _2, which opens the room air damper, the air damper and the circulated air damper according to the switching time preset Performs the concentration control mode,
If the enthalpy of the indoor air and the enthalpy of the outdoor air are greater than the enthalpy of the outdoor air when the CO ₂ concentration measured by the indoor CO ₂ sensor is less than a predetermined set concentration, A control unit for performing an enthalpy control mode for opening the outside air damper and the circulating air damper;
A mixed air temperature sensor installed in the outside air inlet duct for measuring a temperature of mixed air in which outside air and room air circulated through the circulating air duct are mixed;
And a humidifier installed in the outside air inlet duct for humidifying air flowing into the room,
Wherein,
Wherein the control unit compares a difference between a temperature of the indoor air and a preset indoor temperature when the CO ₂ concentration measured by the indoor CO ₂ sensor is lower than a predetermined set concentration,
When the difference between the indoor air temperature and the indoor set temperature is equal to or greater than the set temperature difference, the heating operation mode is stopped,
After the heating operation mode is stopped, the enthalpy of the indoor air is compared with the enthalpy of the ambient air,
If the enthalpy of the indoor air is larger than the enthalpy of the outdoor air,
And a controller for comparing the temperature of the mixed air measured by the mixed air temperature sensor with a preset mixed air set temperature when the humidifying device is in operation,
And controlling the indoor air damper, the outside air damper, and the circulating air damper to open according to an opening rate proportional to the temperature of the mixed air to introduce the outside air when the temperature of the mixed air is equal to or higher than the set air mixing temperature Introduction system. The method of claim 7,
Wherein,
And comparing the temperature of the outside air measured by the outside air temperature sensor with the dew point temperature of the room air if the humidifying device is not operated,
Comparing the temperature of the mixed air measured by the mixed air temperature sensor with the mixed air set temperature if the temperature of the outside air is higher than the dew point temperature of the room air,
And controlling the indoor air damper, the outside air damper, and the circulating air damper to open according to an opening rate proportional to the temperature of the mixed air to introduce the outside air when the temperature of the mixed air is equal to or higher than the set air mixing temperature Introduction system. The method according to claim 7 or 8,
Wherein,
If the temperature of the mixed air is lower than the set air temperature, the opening rate of the indoor air damper, the outside air damper, and the circulating air damper is changed until the temperature of the mixed air becomes equal to or higher than the set air temperature A system for introducing outside air to be controlled. Room air measuring step of measuring the CO ₂ concentration of the air inside the room where the operation, the room air CO ₂ sensor of an air conditioner indoor air discharged through the discharge duct and;
The control unit opens the indoor air damper for opening and closing the indoor air discharge duct according to the preset opening and closing time when the CO ₂ concentration of the indoor air measured in the above step exceeds a predetermined set concentration and opens and closes the outdoor air inflow duct the opening, and the circulating air duct CO ₂ concentration control mode controlling so as to open the return air damper for opening and closing and;
The control unit performs an enthalpy control mode for controlling the opening and closing of the indoor air damper and the outside air damper according to the enthalpy of the indoor air and the enthalpy of the outdoor air when the CO ₂ concentration of the indoor air measured in the above- ;
The enthalpy control mode, when in the summer cooling mode or spring and autumn mid-period operation mode,
The indoor temperature sensor and the indoor humidity sensor measure the temperature and the relative humidity of the indoor air discharged through the indoor air discharge duct, and the outdoor temperature sensor and the outdoor humidity sensor measure the temperature and relative humidity of the ambient air flowing through the outdoor air inlet duct Respectively,
Calculating enthalpy of indoor air and enthalpy of outdoor air;
Comparing the temperature of the outside air with a preset room temperature if the enthalpy of the room air is greater than the enthalpy of the outside air;
Calculating and comparing an absolute humidity of the outside air and a preset indoor humidity if the temperature of the outside air is lower than the indoor set temperature;
Calculating a difference between the indoor air temperature and the indoor indoor temperature when the absolute humidity of the outdoor air is lower than the indoor absolute humidity;
Opening the indoor air damper, the outside air damper, and the circulating air damper at a predetermined maximum opening degree when the difference between the indoor set temperature and the indoor air temperature is equal to or less than a predetermined set minimum temperature difference;
If the difference between the indoor set temperature and the indoor air temperature exceeds the set minimum temperature difference and is equal to or less than a predetermined set maximum temperature difference, the indoor air damper, the outside air damper, and the circulating air damper, The opening rate being set in proportion to the difference between the opening rate and the opening rate,
Opening the indoor air damper, the outside air damper and the circulating air damper at a preset minimum opening degree when the difference between the indoor set temperature and the indoor air temperature exceeds the set maximum temperature difference, Way. Room air measuring step of measuring the CO ₂ concentration of the air inside the room where the operation, the room air CO ₂ sensor of an air conditioner indoor air discharged through the discharge duct and;
The control unit opens the indoor air damper for opening and closing the indoor air discharge duct according to the preset opening and closing time when the CO ₂ concentration of the indoor air measured in the above step exceeds a predetermined set concentration and opens and closes the outdoor air inflow duct the opening, and the circulating air duct CO ₂ concentration control mode controlling so as to open the return air damper for opening and closing and;
The control unit controls the opening and closing of the indoor air damper, the outside air damper, and the circulating air damper according to the enthalpy of the indoor air and the enthalpy of the outside air when the CO ₂ concentration of the indoor air measured in the above- Performing an enthalpy control mode;
The enthalpy control mode, when in the winter heating operation mode,
The indoor temperature sensor and the indoor humidity sensor measure the temperature and the relative humidity of the indoor air discharged through the indoor air discharge duct, and the outdoor temperature sensor and the outdoor humidity sensor measure the temperature and relative humidity of the ambient air flowing through the outdoor air inlet duct Respectively,
Stopping the heating operation mode of the air conditioner if the difference between the indoor air temperature and the preset indoor temperature is greater than a predetermined temperature difference;
Calculating enthalpy of indoor air and enthalpy of outdoor air;
Confirming whether the humidifying device for humidifying air flowing into the room is operating if the enthalpy of the room air is larger than the enthalpy of the outside air;
Comparing the temperature of the mixed air in which the room air circulated through the circulating air duct and the outside air are mixed with the preset mixed air setting temperature if the humidifying device is in operation,
Opening the atmospheric air damper, the atmospheric air damper, and the circulating air damper according to an opening rate proportional to the temperature of the mixed air when the temperature of the mixed air is equal to or higher than the set air-mixing temperature;
If the temperature of the mixed air is lower than the set air temperature, the opening rate of the indoor air damper, the outside air damper, and the circulating air damper is changed until the temperature of the mixed air becomes equal to or higher than the set air temperature And
And comparing the temperature of the outside air measured by the outside air temperature sensor with the dew point temperature of the room air if the humidifying device is not operated,
Comparing the temperature of the mixed air with the set air temperature if the temperature of the outside air is higher than the dew point temperature of the room air,
And opening the indoor air damper, the outside air damper, and the circulating air damper according to an opening rate set to be proportional to the temperature of the mixed air, if the temperature of the mixed air is equal to or higher than the set air mixing temperature, / RTI &gt;

Images