KR20080062985A - Air conditioning system and control method for the same - Google Patents

Abstract

An air conditioning system and a control method thereof are provided to perform cooling and heating operations corresponding to variation of load by continuously changing an operating frequency of an inverter compressor when the variation of load is detected. An air conditioning system comprises at least one air conditioning unit(100) and at least one outdoor unit(200). The air conditioning unit includes an indoor heat exchanger(120), discharges indoor air to the outside, and sucks outdoor air to exhaust the outdoor air to an interior of a room through the indoor heat exchanger, thereby selectively performing ventilation of an indoor space, air purification, and cooling and heating. The outdoor unit includes an outdoor heat exchanger(240), and is connected to the indoor heat exchanger in order to vary the cooling and heating capacity of the air conditioning unit by changing the capacity of heat supplied to the indoor heat exchanger or capacity of heat collected by the indoor heat exchanger.

Description

Air Conditioning System and Control Method {AIR CONDITIONING SYSTEM AND CONTROL METHOD FOR THE SAME}

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

2 is a block diagram showing a control system of the air conditioning system according to the present invention.

3 is a flowchart showing the first embodiment of the control method of the air conditioning system according to the present invention.

4 is a flowchart showing a second embodiment of a control method of an air conditioning system according to the present invention.

5 is a flowchart showing a third embodiment of a control method of an air conditioning system according to the present invention.

<Description of Main Symbols Used in Drawings>

100: air conditioning unit 120: indoor heat exchanger

200: outdoor unit 210: capacity variable compression means

211: Inverter Compressor 212: Constant Speed Compressor

220: switching device 240: outdoor heat exchanger

The present invention relates to an air conditioning system and a method of controlling the same. More particularly, an optimum response to air conditioning requirements is provided by continuously changing the capacity of heating and cooling in response to the continuous change of the heating and cooling load in an area where cooling and heating is required in a building. The present invention relates to an air conditioning system and a control method thereof.

In general, an air conditioning system is an air conditioning facility of a general building as a device for cooling and heating an interior through a phase change phenomenon of a refrigerant using an outdoor unit installed on an outdoor side.

This conventional air conditioning system basically performs the function of ventilation by discharging the indoor air to the outside and supplying the fresh air into the room, and performs the function of cooling and heating by supplying the air sucked from the outside to the room In addition, the air purifying function is also performed by filtering and supplying the air, which is air-conditioned to the room.

Such an air conditioning system includes an AHU (Air Handling Unit) installed at one side of an indoor space and an outdoor unit connected to the indoor unit to perform the cooling and heating function by the AHU by circulation of a refrigerant cycle. The outdoor unit for driving the AHU provides cooling and heating functions by blowing hot or cold air generated through a process of compressing, condensing (heating), expanding, and evaporating (heat absorbing) a predetermined amount of refrigerant to the indoor space with a fan. Was performed.

However, such an air conditioning system requires cooling and heating of a very large indoor space in a building, and since the large indoor space in such a building has very high fluctuations in air conditioning and heating loads, in order to operate efficiently, optimized air conditioning according to load fluctuations has to be achieved. The conventional air conditioning system has a problem that such an optimized operation is impossible.

That is, in the conventional air conditioning system, the efficient capacity change due to the change in the air conditioning load is not properly made, and thus the energy consumption efficiency is very low and there is a problem in that the operating cost is consumed more than necessary.

The present invention is to solve the above problems, an object of the present invention is to optimally respond to the air conditioning requirements by continuously changing the capacity of the heating and cooling in response to the continuous change in the heating and cooling load of the area required for heating and cooling in the building It is possible to provide an air conditioning system and a method of controlling the same, by which the energy consumption efficiency is high and the operating cost can be reduced.

An air conditioning system according to the present invention for achieving the above object, in the air conditioning system used as the air conditioning equipment of the building, having an indoor heat exchanger and discharge the indoor air to the outside and suck the outdoor air through the heat exchanger At least one air conditioning unit for selectively performing the ventilation, air purification and heating and cooling of the indoor space by discharging to the room; And a capacity variable compression means connected to the indoor heat exchanger and configured to vary the capacity of the heat supplied to the indoor heat exchanger or the capacity of the heat recovered from the heat exchanger, thereby enabling the air conditioning unit to vary the cooling and heating capacity. It includes at least one outdoor unit.

In addition, the capacity variable compression means is characterized in that it comprises an inverter compressor which can vary the amount of refrigerant to be compressed by adjusting the operating frequency.

In addition, the capacity variable compression means is characterized in that it comprises an inverter compressor which can vary the amount of the refrigerant to be compressed by adjusting the operating frequency, and at least one constant speed compressor for compressing a certain amount of the refrigerant.

In addition, the capacity variable compression means, characterized in that it comprises at least two constant speed compressor for compressing a predetermined amount of refrigerant.

In addition, the air conditioning unit, characterized in that it comprises a blowing means for varying the cooling and heating capacity of the air conditioning unit by varying the amount of air passing through the indoor heat exchanger.

In addition, the blowing means, characterized in that it comprises an inverter fan that can vary the amount of blowing air by the adjustment of the operating frequency.

In addition, the outdoor unit, characterized in that it comprises an outdoor fan to be able to change the cooling and heating capacity of the air conditioning unit by varying by adjusting the operating frequency in accordance with the capacity change of the capacity variable compression means.

In addition, by performing at least one of input sensing of the set temperature by the user, sensing the indoor temperature by the temperature sensor installed in the indoor space, and sensing the temperature or pressure of the refrigerant by the temperature sensor or pressure sensor installed in the refrigerant pipe. And a control unit configured to control at least one of the load sensing means for sensing and the capacitive variable compression means, the inverter fan, and the outdoor fan according to a sensing result of the load sensing means.

On the other hand, the air conditioning system according to another embodiment of the present invention, having a heat exchanger and at least one to discharge the indoor air to the outside and to suck the outdoor air to discharge the indoor space through the heat exchanger to perform the heating and cooling of the indoor space Air conditioning unit; At least one outdoor unit connected to the heat exchanger to supply heat to the heat exchanger or to extract heat from the heat exchanger to enable heating and cooling of an indoor space; And a blowing means provided in the air conditioning unit to change the air-conditioning capacity of the air conditioning unit by varying the amount of air passing through the heat exchanger.

On the other hand, the control method of the air conditioning system according to the present invention, the control method of the air conditioning system used as the air conditioning equipment of the building, (A) operating the air conditioning unit and the outdoor unit; (B) detecting a load change of cooling or heating through the load sensing means; (C) changing the capacity of at least one of the capacity variable compression means, the blowing means, and the outdoor fan when there is a load change in the step (B); And (D) repeating steps (B) and (C) until the operation of the air conditioning unit and the outdoor unit is completed.

The step (B) may include at least one of input sensing of a set temperature by a user, sensing indoor temperature by a temperature sensor installed in an indoor space, and sensing temperature or pressure of a refrigerant by a temperature sensor or a pressure sensor installed in a refrigerant pipe. It characterized in that it comprises the step of sensing the load by one.

In addition, the step (B) includes (B1) detecting the load through the load sensing means, and (B2) comparing the load detected immediately before the (B1) step to determine whether there is a change in load. Characterized in that.

In addition, the step (C), if there is an increase in the load (C1), the step of detecting the increase of the load, and (C2) the inverter compressor and the outdoor fan in accordance with the increase of the load detected in the (C1) step Increasing the operating frequency of each blowing means by a predetermined range.

In addition, in step (C), if there is a decrease in load (C3), the step of detecting a decrease in load and (C4) the inverter compressor and the outdoor fan according to the decrease in the load detected in step (C3); It characterized in that it comprises the step of reducing the operating frequency of each blowing means by a predetermined range.

In addition, in step (C), if there is an increase in load, (C1), the step of detecting an increase in load and (C5) the increase in load detected in step (C1) is the maximum of the compression means currently being driven. Determining whether the capacity is exceeded; and (C6) when the increase of the load detected in the step (C1) exceeds the maximum capacity of the compression means that is currently being driven, the other constant speed compressor is driven. And (C7) when the increase in the load detected in the step (C1) does not exceed the maximum capacity of the compression means currently being driven, as determined by the step (C2). And increasing the operating frequency of the inverter compressor, the outdoor fan, and the blowing means by a predetermined range according to the increase amount below.

On the other hand, the control method of the air conditioning system according to another embodiment of the present invention, in the control method of the air conditioning system used as the air conditioning equipment of the building, (a) the load sensing means for detecting the load of cooling or heating Doing; (b) determining any one of a plurality of operation modes according to the load sensed in step (a); (c) operating the air conditioning unit and the outdoor unit according to the operation mode determined as a result of step (b), wherein driving the inverter compressor or the inverter compressor and at least one constant speed compressor in the outdoor unit; (d) detecting a load change of cooling or heating through a load sensing means; (e) if there is a load variation in step (d), determining whether the changed load amount is outside the capability range of a currently operating mode; (f) feeding back to step (b) if the variable load in step (e) is outside the capability range of the currently operating mode; And (g) in step (e), if the variable load does not exceed the capability range of the currently operating mode, adjusting the operating frequency of at least one of the inverter compressor, the blower and the outdoor fan according to the changed load. Performing the operation.

In addition, the step (e), (e1) when detecting the increase of the load in the step (d), the step of detecting the load increase amount, (e2) the load amount detected in the step (e1) is currently operating Determining whether the maximum capacity of the compression means in the operation mode is exceeded.

In addition, in step (e), if (e3) the load reduction is detected in step (d), detecting the load reduction amount, and (e4) the load amount detected in step (e3) is currently in operation. Determining whether it is less than the minimum capacity of the compression means in the operating mode.

Hereinafter, a preferred embodiment of an air conditioning system and a control method thereof according to the present invention will be described with reference to the drawings.

1 is a schematic diagram showing the configuration of an air conditioning system according to the present invention, Figure 2 is a block diagram showing a control system of the air conditioning system according to the present invention, Figure 3 is a control of the air conditioning system according to the present invention 4 is a flowchart showing a first embodiment of the method, and FIG. 4 is a flowchart showing a second embodiment of the control method of the air conditioning system according to the present invention, and FIG. 5 is a control of the air conditioning system according to the present invention. A flowchart showing the third embodiment of the method.

As shown in FIG. 1, the air conditioning system according to the present invention basically performs a function of ventilation by discharging indoor air to an outdoor location and supplying fresh air to an indoor location. At least one air conditioning unit 100 to perform a function of cooling and heating by supplying heat to the room, and to perform an air purifying function by filtering and supplying by filtering, etc., when supplying air conditioned to the room, and the air conditioning unit 100 At least one outdoor unit 200 connected to the air conditioning unit 100 to cool or heat a predetermined indoor space of the air conditioning unit 100 through the compression, condensation (heat dissipation), expansion, and evaporation (heat absorption) processes of the refrigerant. It is made, including. Although FIG. 1 illustrates a case in which one air conditioning unit 100 and one outdoor unit 200 are provided, the present invention is not limited thereto, and a plurality of outdoor units are connected to one air conditioning unit or a plurality of air conditioning units. It includes both the case where a plurality of outdoor units are connected, and the case where one outdoor unit is connected to the plurality of air conditioning units.

The air conditioning unit 100 is installed on one side of the interior space inside the building or installed inside or outside the ceiling, and is provided at one end of the case 101 to communicate with the interior space and indoor air from the interior space. Is provided with a suction port 102 is sucked into the other end of the case 101 and the discharge port 103 is in communication with the indoor space and the air is discharged to the indoor space is provided.

In addition, one side of the case 101 communicates with the outside and the exhaust port 105 through which the indoor air sucked through the inlet 102 is exhausted to the outside, and the outdoor air communicates with the outside to the case 101. An intake port 104 for inhalation is provided.

The flow of air through the inlet port 102 and the exhaust port 105 is made through the suction fan 111, and the flow of air through the inlet port 104 and the discharge port 103 is made through the discharge fan 112. . 1 illustrates a case in which both the suction fan 111 and the discharge fan 112 are provided as a device for circulation of air to the air conditioning unit 100 of the air conditioning system according to the present invention. An effect similar to the above can be obtained by mounting one fan at an appropriate position inside the 101. Of course, it is also possible to install three or four or more fans if necessary. Hereinafter, the fan device as described above will be referred to collectively as a blowing means.

On the other hand, inside the case 101, some air that is not discharged to the outside of the outdoor air introduced into the case 101 through the inlet 104 and the indoor air sucked through the inlet 104 is discharged 105 Indoor heat exchanger 120 to exchange heat while flowing toward the), the filter 130 to filter foreign matters and the like before the air passes through the indoor heat exchanger 120, and to maintain the humidity of the indoor space to a certain level Humidification member 140 to be installed. The filter 130 and the humidifying member 140 may be selectively installed or excluded by the user.

In addition, the outdoor unit 200 connected to the indoor heat exchanger 120 is connected to the capacity variable compression means 210 and the capacity variable compression means 210 and switches the traveling direction of the refrigerant according to the cooling or heating mode. The air conditioning unit includes a switching device 220, an outdoor heat exchanger 240, an outdoor fan 241 installed adjacent to the outdoor heat exchanger 240, and an outdoor expansion device 242. 100 further includes an indoor expansion device 150 installed on the indoor heat exchanger 120 side.

The indoor heat exchanger 120 installed in the capacity variable compression means 210, the switching device 220, the outdoor heat exchanger 240, the outdoor fan 241, the outdoor expansion device 242, and the case 101. And the indoor expansion device 150 forms one refrigeration cycle and performs air conditioning.

The capacitive variable compression means 210 may include one inverter compressor 211, one inverter compressor 211 and one constant speed compressor 212, which is not shown in the drawings. However, it may include one inverter compressor 211 and a plurality of constant speed compressors, or may include only a plurality of constant speed compressors.

The inverter compressor 211 is a compressor that allows the capacity of the compressed refrigerant to be adjusted by an operating frequency. The capacity of the compressed refrigerant can be changed in predetermined frequency units. For example, if the capacity can be changed in units of 1Hz of operation frequency and the capacity can be varied up to 100Hz, the load of cooling and heating can be changed by varying the capacity up to 100Hz while changing the operating frequency in units of 1Hz according to the load change. . That is, the capacity can be changed almost linearly.

Therefore, the present invention is capable of performing heating and cooling corresponding to the fluctuating load by continuously changing the operating frequency of the inverter compressor 211 when the load is detected and the fluctuation of the load. If the increase in load exceeds the maximum capacity of the inverter compressor 211, the constant speed compressor 212 is further driven, and if the capacity is exceeded, the constant speed compressor can be added and driven again to efficiently cope with the load of heating and cooling. To help.

On the other hand, the outdoor fan 241 is also provided as an inverter fan by adjusting the operating frequency, that is, the rotation speed is adjusted by a predetermined frequency unit to show the maximum condensation efficiency in response to the capacity change of the inverter compressor 211. Preferably.

The blowing means is also preferably provided as an inverter fan to change the number of rotation by changing the operating frequency in accordance with the capacity change of the inverter compressor 211 to exhibit the maximum heat exchange efficiency.

On the other hand, the refrigerant pipe connected from the outdoor unit 200 to the indoor heat exchanger 120 connects the capacity variable compression means 210 and the switching device 220 and is discharged from the capacity variable compression means 210. The discharge pipe 250 through which the refrigerant flows, the first pipe 251 connecting the switching device 220 and the outdoor heat exchanger 240, the outdoor heat exchanger 240, and the indoor heat exchanger 120. A second pipe 252 to which the outdoor expansion device 242 and the indoor expansion device 150 are installed, and a third connection between the indoor heat exchanger 120 and the switching device 220. It includes a pipe 253 and the return pipe 254 for connecting the switching device 220 and the capacity variable compression means 210 and the refrigerant flowing back to the capacity variable compression means 210.

Here, the refrigerant circulation during cooling and heating will be described.

At the time of cooling, the refrigerant having high temperature and high pressure discharged from the capacity variable compression means 210 is switched by the switching device 220 along the discharge pipe 250 and introduced into the outdoor heat exchange 240 along the first pipe 251. The heat dissipation is condensed to form a liquid refrigerant. The refrigerant passing through the outdoor heat exchanger 240 flows through the second pipe 252 and expands in the indoor expansion valve 150, and then flows into the indoor heat exchanger 120. It evaporates to become a gaseous refrigerant. At this time, since the refrigerant recovers the surrounding heat while evaporating, that is, the heat is removed from the air passing through the indoor heat exchanger 120, thereby lowering the temperature of the air supplied to the indoor space, thereby allowing cooling. In addition, the outdoor expansion device 242 installed on the second pipe 252 is preferably open so that the refrigerant can pass through without opening completely. When the outdoor expansion device 242 expands the refrigerant and flows into the indoor heat exchanger 120, since the outdoor expansion device 242 and the indoor heat exchanger 120 are considerably separated from each other, the refrigerant having a lower pressure is pressured. Since it may be difficult to flow to the indoor heat exchanger 120 due to a car or the like, it is preferable to expand the refrigerant in the indoor expansion device 150 to directly enter the indoor heat exchanger 120 during cooling. The refrigerant passing through the indoor heat exchanger 120 passes through the switching device 220 along the third pipe 253 and flows back into the capacity variable compression means 210 along the return pipe 254 to complete the cycle. do.

On the other hand, during heating, the high temperature and high pressure refrigerant discharged from the capacity variable compression means 210 is switched in the switching device 220 along the discharge pipe 250 to flow along the third pipe 253 and the indoor heat exchange. The heat of the refrigerant is transferred to the air flowing into the gas 120 and passing through the indoor heat exchanger 120. At this time, the refrigerant passing through the indoor heat exchanger 120 is radiated to condense to become a liquid refrigerant. It flows along the pipe 252 and expands to the outdoor expansion device 242 to expand and evaporate through the outdoor heat exchanger 240 in a state where the pressure is lowered to become a gaseous refrigerant. The evaporated refrigerant is returned to the capacity variable compression means 210 along the return pipe 254 after passing through the switching device 220 along the first pipe 251. At this time, it is preferable that the indoor expansion device 150 is fully opened by adjusting the opening degree so that the expansion of the refrigerant does not occur in the indoor expansion device 150 and is expanded in the outdoor expansion device 242.

On the other hand, it will be described with respect to the control system of the air conditioning system according to the present invention shown in FIG.

As shown in FIG. 2, the air conditioning system according to the present invention includes a variable-capacity compression unit 210, an outdoor fan 241, and a control unit M for controlling the air blowing unit shown in FIG. 1. It is connected to (M) and includes a load sensing means (S) for sensing the load and transferring the detection result to the controller (M).

The load detection means (S) detects the input of the set temperature by the user, or detects the indoor temperature by the temperature sensor installed in the indoor space, or the refrigerant pipe by the temperature sensor or pressure sensor installed in the refrigerant pipe The current load can be detected by sensing the temperature or pressure of the refrigerant flowing through the controller, and when the load is detected, the controller M calculates this to a certain value and compares it with the value for the immediately detected load to determine whether the increase or decrease is performed. do.

Hereinafter, a method of controlling an air conditioning system according to each embodiment of the present invention will be described with reference to FIGS. 3 to 5.

3 relates to a control method of an air conditioning system according to a first embodiment of the present invention, and relates to a case where an inverter compressor is provided as a capacity variable compression means of an outdoor unit.

As shown in Figure 3, the control unit initially detects the load by the load sensing means (S100). In this case, the load detection may be a start command by the user initially, or the control unit may sense the temperature of the indoor space to detect whether the controller is out of a preset temperature range preset in the control unit.

The control unit determines whether to start the operation of the air conditioning system according to the result detected in the step of detecting the load (S200).

If it is determined to start the operation, the controller operates the inverter compressor (S210), drives the outdoor fan (S220), and operates the blowing means (S230).

After that, the controller continuously detects whether or not the load is changed. The load is detected by the load sensing means (S300) and the load variation is compared with the load sensing result performed immediately before the step S300. It is determined whether there is a step (S400).

Wherein the step S300, as described above, if there is an input of the set temperature by the user, or detect the room temperature by the temperature sensor installed in the indoor space, or by the temperature sensor or pressure sensor installed in the refrigerant pipe Detects the temperature or pressure of the refrigerant flowing through the refrigerant pipe.

If there is no load change as a result of performing the step S400, through the step of determining whether the operation is terminated by the user or whether the current air conditioning state is terminated by matching the target air conditioning state (S420). If the operation is terminated, the inverter compressor, the outdoor fan, and the blowing means are all stopped and fed back to the step S100. If the operation is not finished, the feedback is returned to the step S300.

If there is a change in load as a result of performing the step S400, the controller compares the load sensed just before and the currently sensed load to determine whether there is an increase in the load (S410), and if the load is increased, the increase in load Detects (S411), if the load is not increased because the load is reduced to detect the amount of reduction of the load (S413).

When the increase amount of the load is sensed in step S411 of detecting the increase amount of the load, the operating frequencies of the inverter compressor, the outdoor fan, and the blowing means are increased to correspond to the increased load (S412). Increasing the operating frequency increases the amount of compressed refrigerant of the inverter compressor, the number of rotations of the outdoor fan and the blowing means is also increased, and then fed back to the step S300 again and continues from step S300 to subsequent steps Perform.

If the load is reduced, the amount of load reduction is sensed (S413) and the operating frequencies of the inverter compressor, the outdoor fan, and the blowing means are reduced to correspond to the reduced load, respectively (S414). When the operating frequency is decreased, the amount of compressed refrigerant of the inverter compressor is decreased, and the rotation speed of the outdoor fan and the blower is also reduced. After that, the feedback is fed back to the step S300 to repeat the steps from the step S300 onwards. Perform.

On the other hand, in the control method of the air conditioning system according to the second embodiment of the present invention shown in Figure 4, the capacity variable compression means 210 shown in Figure 1 is an inverter compressor 211 and at least one constant speed compressor 212 It is related with the case provided.

The control unit initially detects the load by the load sensing means (S100). In this case, the load detection may be a start command by the user initially, or the control unit may sense the temperature of the indoor space to detect whether the controller is out of a preset temperature range preset in the control unit.

The control unit determines whether to start the operation of the air conditioning system according to the result detected in the step of detecting the load (S200).

If it is determined to start the operation, the controller operates the inverter compressor (S210), drives the outdoor fan (S220), and operates the blowing means (S230).

After that, the controller continuously detects whether or not the load is changed. The load is detected by the load sensing means (S300) and the load variation is compared with the load sensing result performed immediately before the step S300. It is determined whether there is a step (S400).

Wherein the step S300, as described above, if there is an input of the set temperature by the user, or detect the room temperature by the temperature sensor installed in the indoor space, or by the temperature sensor or pressure sensor installed in the refrigerant pipe Detects the temperature or pressure of the refrigerant flowing through the refrigerant pipe.

If there is no load change as a result of performing the step S400, through the step of determining whether the operation is terminated by the user or whether the current air conditioning state is terminated by matching the target air conditioning state (S420). If the operation is terminated, the inverter compressor, the outdoor fan, and the blowing means are all stopped and fed back to the step S100. If the operation is not finished, the feedback is returned to the step S300.

If there is a change in load as a result of performing the step S400, the controller compares the load sensed just before and the currently sensed load to determine whether there is an increase in the load (S410), and if the load is increased, the increase in load Detects (S411), if the load is not increased because the load is reduced to detect the amount of reduction of the load (S413).

When the load increase amount is detected in step S411, the controller determines whether the increased load exceeds the maximum capacity of the inverter compressor (or inverter compressor and at least one constant speed compressor) currently being driven (S510). If the increased load exceeds the maximum capacity of the inverter compressor (or inverter compressor and at least one constant speed compressor) currently being driven, start the non-operating constant speed compressor and increase the operating frequency of the outdoor fan and the blower means further ( S511). And again fed back to the step S300 and continues from step S300 and subsequent steps repeatedly. If the increased load does not exceed the maximum capacity of the currently running inverter compressor (or inverter compressor and at least one constant speed compressor), the operating frequency of each of the inverter compressor, the outdoor fan, and the blower means corresponds to the increased load. Each step is incremented (S512) and fed back to the step S300 to repeatedly perform the subsequent steps from step S300.

On the other hand, if the load reduction amount is detected in step S413, the controller determines whether the reduced load is less than the minimum capacity of the inverter compressor (or inverter compressor and at least one constant speed compressor) currently being driven (S520). If the reduced load is less than the minimum capacity of the currently operating inverter compressor (or the inverter compressor and at least one constant speed compressor), the constant speed compressor is stopped and the operating frequency of the outdoor fan and the blower means corresponds to the decrease in load. Reduce (S521). And again fed back to the step S300 and continues from step S300 and subsequent steps repeatedly. If the reduced load is not less than the minimum capacity of the inverter compressor (or inverter compressor and at least one constant speed compressor) currently being driven, the operating frequency of each of the inverter compressor, outdoor fan, and blower means must correspond to the reduced load. Each step is reduced (S522) and fed back to the step S300 and the steps after the step S300 are repeatedly performed.

On the other hand, the control method of the air conditioning system according to the third embodiment of the present invention shown in FIG. 5 relates to a case where the capacity variable compression means comprises an inverter compressor and three constant speed compressors.

The control unit initially detects the load by the load sensing means (S100). In this case, the load detection may be a start command by the user initially, or the control unit may sense the temperature of the indoor space to detect whether the controller is out of a preset temperature range preset in the control unit.

According to the result detected in the step of detecting the load, the controller selects an operation mode of the air conditioning system and starts operation (S20, S30, S40 and S50). Here, the driving mode includes a first driving mode S20, a second driving mode S30, a third driving mode S40, and a fourth driving mode S50, and when driving in the first driving mode, In the operation mode of operating the inverter compressor, the operation mode to operate the inverter compressor and the first constant speed compressor when the operation in the second operation mode, the inverter compressor, the first constant speed compressor when operating in the third operation mode And an operation mode for operating the second constant speed compressor, and when operating in the fourth operation mode, an operation mode for operating the inverter compressor, the first constant speed compressor, the second constant speed compressor, and the third constant speed compressor. The controller detects the load and determines which operation mode of the first operation mode or the fourth operation mode to operate.

When operating in the first operation mode, the inverter compressor is operated (S21), the outdoor fan is operated (S22), and the blowing means is operated (S23).

When operating in the second operation mode, the inverter compressor and the first constant speed compressor are operated (S31), the outdoor fan is operated (S32), and the blowing means is operated (S33).

When operating in the third operation mode, the inverter compressor, the first constant speed compressor and the second constant speed compressor are operated (S41), the outdoor fan is operated (S42), and the blowing means is operated (S43).

When operating in the fourth operation mode, the inverter compressor, the first constant speed compressor, the second constant speed compressor, and the third constant speed compressor are operated (S41), the outdoor fan is operated (S42), and the blowing means is operated (S43). .

After the operation is started in any one of the operation modes, the control unit continuously detects whether or not the load is changed, the step of detecting the load by the load sensing means (S300) and the load performed immediately before the result of performing the step S300. In operation S400, it is determined whether there is a load change by comparing with the detection result.

Wherein the step S300, if there is an input of the set temperature by the user, or detects the indoor temperature by the temperature sensor installed in the indoor space, or flow the refrigerant pipe by the temperature sensor or pressure sensor installed in the refrigerant pipe It means to sense the temperature or pressure of refrigerant.

If there is no load change as a result of performing the step S400, the step of determining whether the operation is terminated by the user or whether the current air conditioning state is terminated by matching the target air conditioning state (S420). If the operation is terminated, the inverter compressor, the outdoor fan, and the blowing means are all stopped and fed back to the step S100. If the operation is not finished, the feedback is sent to the step S300.

If there is a change in load as a result of performing the step S400, the controller compares the load sensed just before and the currently sensed load to determine whether there is an increase in the load (S410), and if the load is increased, the increase in load Detects (S411), if the load is not increased because the load is reduced to detect the amount of reduction of the load (S413).

When the load increase amount is detected in step S411, the controller determines whether the increased load exceeds the maximum capacity of the inverter compressor (or the inverter compressor and at least one constant speed compressor) according to the current operation mode (S510). If the increased load exceeds the maximum capacity of the inverter compressor (or inverter compressor and at least one constant speed compressor) currently being driven, it is fed back to the determination step of the operation mode. That is, determining whether to drive in the first driving mode (S20), the second driving mode (S30), the third driving mode (S40) or the fourth driving mode (S50) Repeat the subsequent steps according to the operation mode which is newly fed back to the detected and detected load. If the increased load does not exceed the maximum capacity of the currently operating inverter compressor (or inverter compressor and at least one constant speed compressor), the operating frequency of each of the inverter compressor, the outdoor fan and the blower means is increased to the increased load. Each step is incremented correspondingly (S512) and fed back to the step S300 to repeatedly perform the subsequent steps from step S300.

On the other hand, if the load reduction amount is detected in step S413, the controller determines whether the reduced load is less than the minimum capacity of the inverter compressor (or inverter compressor and at least one constant speed compressor) currently being driven (S520). If the reduced load is less than the minimum capacity of the inverter compressor (or inverter compressor and at least one constant speed compressor) currently being driven, it is fed back to the determining step of the operation mode. That is, determining whether to drive in the first driving mode (S20), the second driving mode (S30), the third driving mode (S40) or the fourth driving mode (S50) Repeat the following steps according to the operation mode which is newly determined according to the fed back and sensed load. If the reduced load is not less than the minimum capacity of the inverter compressor (or inverter compressor and at least one constant speed compressor) currently being driven, the operating frequency of each of the inverter compressor, outdoor fan, and blower means must correspond to the reduced load. Each step is reduced (S522) and fed back to the step S300 and the steps after the step S300 are repeatedly performed.

The control method of the air conditioner system according to the third embodiment of the present invention shown in FIG. 5 has been described with respect to the operation control method according to the four operation modes, but is not limited thereto, and the number of constant speed compressors is further reduced. It is possible to control in the operation mode of or to increase the number of constant speed compressors to control the larger number of operation modes.

The air conditioning system and control method thereof according to the present invention having the above-mentioned characteristics are the optimum response to the air conditioning requirements by continuously changing the capacity of the heating and cooling in response to the continuous change of the heating and cooling load of the area required for heating and cooling in the building This makes it possible to have high energy consumption efficiency and to reduce operating costs.

Claims (18)

In the air conditioning system used as the air conditioning equipment of the building, At least one air conditioning unit having an indoor heat exchanger and configured to discharge indoor air to the outside, suck out outdoor air, and discharge the indoor air to the interior through the heat exchanger to selectively perform ventilation, air purification, and air conditioning of the indoor space; And At least a capacity variable compression means connected to the indoor heat exchanger and configured to vary the capacity of the heat supplied to the indoor heat exchanger or the capacity of the heat recovered from the heat exchanger, thereby enabling the air conditioning unit to vary the cooling and heating capacity. Air conditioning system including one outdoor unit. The method of claim 1, wherein the capacity variable compression means, And an inverter compressor capable of varying the amount of refrigerant to be compressed by adjusting the operating frequency. The method of claim 1, wherein the capacity variable compression means, And an inverter compressor capable of varying the amount of refrigerant to be compressed by adjusting the operating frequency, and at least one constant speed compressor for compressing a predetermined amount of refrigerant. The method of claim 1, wherein the capacity variable compression means, And at least two constant speed compressors compressing a predetermined amount of refrigerant. The air conditioning unit according to any one of claims 1 to 4, wherein And air blowing means for varying the cooling and heating capacity of the air conditioning unit by varying the amount of air passing through the indoor heat exchanger. The method of claim 5, wherein the blowing means, And an inverter fan capable of varying the amount of blowing air by adjusting the operating frequency. The outdoor unit of claim 1, wherein the outdoor unit comprises: And an outdoor fan configured to vary the cooling and heating capacity of the air conditioning unit by varying the capacity of the variable capacity compression means by adjusting the operating frequency. The method of claim 7, wherein By detecting at least one of the input of the set temperature by the user, the sensing of the indoor temperature by the temperature sensor installed in the indoor space and the sensing of the temperature or pressure of the refrigerant by the temperature sensor or pressure sensor installed in the refrigerant pipe to detect the heating and cooling load. Load sensing means, And a control unit controlling at least one of the capacitive variable compression means, the inverter fan, and the outdoor fan according to a detection result of the load sensing means. At least one air conditioning unit having a heat exchanger and discharging indoor air to the outside, and sucking outdoor air and discharging the indoor air to the inside through the heat exchanger to perform cooling and heating of the indoor space; At least one outdoor unit connected to the heat exchanger to supply heat to the heat exchanger or to extract heat from the heat exchanger to enable heating and cooling of an indoor space; And And an air blowing unit provided in the air conditioning unit to change the air-conditioning unit's cooling and cooling ability by varying the amount of air passing through the heat exchanger. In the control method of the air conditioning system used as the building air conditioning equipment, (A) operating the air conditioning unit and the outdoor unit; (B) detecting a load change of cooling or heating through the load sensing means; (C) changing the capacity of at least one of the capacity variable compression means, the blowing means, and the outdoor fan when there is a load change in the step (B); And And (D) repeating steps (B) and (C) until the operation of the air conditioning unit and the outdoor unit is completed. The method of claim 10, wherein step (B) is Detecting a load by at least one of input sensing of a set temperature by a user, sensing indoor temperature by a temperature sensor installed in an indoor space, and sensing temperature or pressure of a refrigerant by a temperature sensor or a pressure sensor installed in a refrigerant pipe; Control method of an air conditioning system comprising a. According to claim 10 or 11, wherein step (B) is, (B1) detecting the load through the load sensing means; (B2) a control method of the air conditioning system, comprising the step of determining whether there is a change in load compared to the load sensed immediately before the step (B1). The method of claim 12, wherein step (C) comprises: (C1) detecting the increase in load if there is an increase in load, (C2) a control method of the air conditioning system, comprising increasing the operating frequency of each of the inverter compressor, the outdoor fan, and the blowing means by a predetermined range according to the increase in the load sensed in the step (C1). . The method of claim 12, wherein step (C) comprises: (C3) if there is a decrease in load, detecting a decrease in load; (C4) controlling the operation frequency of each of the inverter compressor, the outdoor fan, and the blowing means by a predetermined range according to the amount of reduction of the load sensed in the step (C3). The method of claim 12, wherein step (C) comprises: (C1) detecting the increase in load if there is an increase in load, (C5) determining whether the increase in load detected in the step (C1) exceeds the maximum capacity of the compression means currently being driven; (C6) driving the other constant speed compressor when the increase of the load sensed in the step (C1) exceeds the maximum capacity of the compression means currently driven, as determined in the step (C2); (C7) If the increase in the load detected in the step (C1) does not exceed the maximum capacity of the compression means currently driven, as determined in the step (C2), according to the increase in the load detected in the step (C1) And increasing the operating frequency of the inverter compressor, the outdoor fan, and the blowing means by a predetermined range. In the control method of the air conditioning system used as the building air conditioning equipment, (a) detecting a load of cooling or heating through a load sensing means; (b) determining any one of a plurality of operation modes according to the load sensed in step (a); (c) operating the air conditioning unit and the outdoor unit according to the operation mode determined as a result of step (b), wherein driving the inverter compressor or the inverter compressor and at least one constant speed compressor in the outdoor unit; (d) detecting a load change of cooling or heating through a load sensing means; (e) if there is a load variation in step (d), determining whether the changed load amount is outside the capability range of a currently operating mode; (f) feeding back to step (b) if the variable load in step (e) is outside the capability range of the currently operating mode; And (g) In step (e), when the variable load does not exceed the capability range of the operation mode currently in operation, operation according to the changed load by adjusting the operating frequency of at least one of the inverter compressor, the blowing means, and the outdoor fan. Control method of an air conditioning system comprising the step of performing. The method of claim 16, wherein step (e) (e1) detecting an increase in load when detecting an increase in load in step (d); and (e2) determining whether the load detected in the step (e1) exceeds the maximum capacity of the compression means in the currently operating mode. The method of claim 17, wherein step (e) (e3) detecting a decrease in load when detecting a decrease in load in step (d); (e4) a control method of the air conditioning system, comprising determining whether the load detected in the step (e3) is less than the minimum capacity of the compression means in the currently operating mode.

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