KR20100064835A - Air conditioner - Google Patents

Abstract

PURPOSE: A multi-type air conditioner and an operation method thereof are provided to minimize the power consumption of a pump by controlling the speed of the pump and the open degree of a flow rate control valve depending on a requested flow rate of an outdoor unit. CONSTITUTION: An operation method of a multi-type air conditioner comprises the following steps. If at least one of a plurality of indoor units is thermo-on(S2), a flow rate control valve controlling the flow rate between a cooling tower and a water-cooled outdoor heat exchanger is opened and the pump between the cooling tower and the water-cooled outdoor heat exchanger starts operating(S3). After opening the flow rate control valve and operating the pump, compressor starts operating(S5). The open degree of the flow rate control valve and the speed of the pump are controlled depending on the requested water flow rate(S6). The requested water flow rate is decided depending on the operation rate of the compressor. The water requested flow rate is decided depending on the temperature detected by the temperature sensor installed at a water collecting pipe.

Description

Multi air conditioner and its operation method {Air conditioner}

 The present invention relates to a multi-type air conditioner and a method of operating the same, and more particularly, to a multi-type air conditioner and a method of operating the outdoor unit having a water-cooled outdoor heat exchanger.

 In general, an air conditioner is a cooling / heating / dehumidifying room using a refrigeration cycle of a refrigerant consisting of a compressor, a condenser, an expansion mechanism, and an evaporator in order to create a more comfortable indoor environment for a user.

The separation type and integral type are functionally the same, but the separation type is an indoor heat exchanger and an indoor blower installed in an indoor unit and an outdoor heat exchanger and an outdoor blower and a compressor installed in an outdoor unit to connect the indoor unit and the outdoor unit separated from each other by a refrigerant pipe. The indoor heat exchanger, the indoor blower, the outdoor heat exchanger, the outdoor blower, and the compressor are installed in one case.

The separate type air conditioner is a single type air conditioner in which one indoor unit is connected to one outdoor unit according to the number of indoor units, and a multi type which achieves the same effect as installing multiple air conditioners by connecting a plurality of indoor units to one outdoor unit. It is divided into air conditioners.

On the other hand, the multi-type air conditioner may include an indoor fan for blowing outdoor air to the outdoor heat exchanger, it may also include a cooling tower for supplying water to the outdoor heat exchanger.

Korean Patent Laid-Open Publication No. 10-2008-0034552 discloses an air conditioner having an outdoor heat exchanger, a cooling tower connected to a water supply pipe and a water recovery pipe, and a water supply pump and a water recovery valve installed at one of the water supply pipe and the water recovery pipe. have.

The water recovery valve is opened when the air conditioner is used normally, so that the water exchanged with the refrigerant in the internal space of the air conditioner is recovered to the cooling tower, and the water is shielded when the air conditioner is not used. It will not be returned to the cooling tower.

However, the air conditioner according to the prior art has a problem that the water recovery valve is operated in a simple operation of simply opening or shielding operation.

The present invention has been made to solve the above problems of the prior art, an object of the present invention is to provide a multi-type air conditioner and its operation method that can adjust the power consumption of the pump.

Another object of the present invention is to provide a multi-type air conditioner and an operation method thereof, in which the outdoor unit controls the flow control valve so that the outdoor unit itself adjusts the water flow rate.

The operation method of the multi-type air conditioner according to the present invention for solving the above problems is to open the flow control valve for controlling the flow rate between the water-cooled outdoor heat exchanger and the cooling tower of at least one of the plurality of indoor units and the water-cooled outdoor Opening the flow regulating valve and starting the pump between the heat exchanger and the cooling tower; A compressor starting step of opening the flow control valve and starting the compressor after starting the pump; And a flow regulating valve and a pump regulating step of adjusting an opening degree of the flow regulating valve and adjusting a speed of the pump after the compressor starting step.

The water demand flow rate is determined according to the operation rate of the compressor.

The required water flow rate is determined according to the sensed temperature of the temperature sensor installed in the water recovery pipe.

The compressor starting step is performed when a compressor operation waiting time elapses after the thermo-on of at least one of the plurality of indoor units.

The operation method of the air conditioner includes: a compressor stopping step of stopping the compressor when all the indoor units are turned off during the flow regulating valve and the pump adjusting step; And closing the flow regulating valve and stopping the pump after the compressor stopping step.

The closing of the flow regulating valve and the pump stopping step are performed after a set time elapses after the compressor stopping step.

Multi-type air conditioner according to the present invention comprises a compressor for compressing the refrigerant; A water-cooled outdoor heat exchanger for exchanging refrigerant and water; An indoor heat exchanger configured to exchange heat between the refrigerant and the indoor air; An expansion mechanism installed in a refrigerant pipe between the water-cooled heat exchanger and an indoor heat exchanger; A cooling tower connected to the water cooling heat exchanger, a water supply pipe, and a water recovery pipe; A pump which is installed at one side of the water supply pipe and the water recovery pipe and whose speed is adjustable; A flow rate control valve capable of adjusting an opening degree to adjust an amount of water passing through the water-cooled heat exchanger; It includes a control unit for adjusting the opening of the flow control valve and the speed of the pump.

And a temperature sensor installed in the water recovery pipe, and the controller controls the opening degree of the flow control valve and the speed of the pump according to the temperature signal value detected by the temperature sensor.

The control unit adjusts the opening degree of the flow control valve and the speed of the pump according to the operation rate of the compressor.

The compressor, the water-cooled outdoor heat exchanger, the flow control valve, and the control unit are disposed inside the outdoor unit, and the cooling tower is disposed outside the outdoor unit.

The pump is disposed inside the outdoor unit.

The present invention configured as described above, the flow rate control valve is adjustable in the opening degree, since the opening degree of the flow control valve and the speed of the pump is adjusted according to the required flow rate of the outdoor unit, excessive water is not supplied to the water-cooled outdoor heat exchanger, There is an advantage to minimize the power consumption of.

In addition, since the pump and the flow control valve is controlled in the outdoor unit, it is not necessary to connect a separate central control unit for controlling the room with the pump and the flow control valve, there is an advantage that can secure a variety of outdoor unit installation area.

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

1 is a schematic block diagram of the multi-type air conditioner according to an embodiment of the present invention during initial operation, and FIG. 2 is a schematic block diagram of the multi-type air conditioner according to the present invention in a stabilized operation.

As shown in FIGS. 1 and 2, the multi-type air conditioner according to the present embodiment includes a plurality of indoor units 1, 2, 3, 4, and an outdoor unit 5.

 The plurality of indoor units (1) (2) (3) (4) includes an indoor heat exchanger (11) for cooling or heating indoor air while the refrigerant is heat-exchanged with the indoor air, and the indoor units (1) (2) (3) (4). Into the indoor fan (12) and the indoor heat exchanger (11), which sucks the indoor air into the interior to exchange heat with the indoor heat exchanger (11) and discharges it to the outside of the indoor unit (1) (2) (3) (4). It includes an expansion mechanism 13 for expanding the refrigerant flowing in or expand the refrigerant flowing out of the indoor heat exchanger (11).

The expansion mechanism 13 consists of LEV, EEV, etc. which adjust the opening degree, and will be described below as an indoor expansion valve.

The plurality of indoor units 1, 2, 3, and 4 are provided with an indoor temperature sensor 14 for sensing an indoor temperature.

A plurality of indoor units (1) (2) (3) (4) is connected to each of the indoor heat exchanger (11) to the engine 16 and the air / heating switching valve (60) described later of the outdoor unit (5), Each indoor expansion mechanism 13 is connected to an outdoor expansion mechanism 54 which will be described later of the outdoor unit 5 and a liquid pipe 17.

 The outdoor unit 5 includes a compression unit 20, a water-cooled outdoor heat exchanger 50, an expansion mechanism 54, and a cooling / heating switching valve 60.

The compression unit 20 sucks and compresses the refrigerant, and then discharges the refrigerant. The compression unit 20 may include one compressor having a variable operation ratio, and may include a plurality of compressors, and may include a plurality of compressors 22 ( 24) will be described.

One of the plurality of compressors 22 and 24 is made of a variable displacement compressor 22 such as an inverter compressor, and the rest of the compressors 22 and 24 is made of a constant speed compressor 24 to vary the operation rate.

For example, if the operating capacity of the indoor unit is less than 50%, the variable capacity compressor 22 is frequency controlled according to the operating capacity of the indoor unit, if the indoor unit operating capacity is 50%, the constant speed compressor is driven, the indoor unit operating capacity is 50% If exceeded, the constant speed compressor 24 is driven, and the capacity variable compressor 22 is frequency controlled according to the operating capacity exceeding 50%.

That is, the operation rate of the plurality of compressors 22 and 24 is adjusted according to the operating capacity of the indoor units 1, 2, 3, and 4.

In the plurality of compressors 22 and 24, suction passages through which refrigerant is sucked are connected in parallel, and discharge passages through which refrigerant is discharged are connected in parallel.

In the plurality of compressors 22 and 24, the suction passage is connected to the cooling / heating switching valve 60, and the accumulator 30 is installed in the suction passage.

The accumulator 30 is a kind of gas-liquid separator connected to the compressors 22 and 24 to accumulate liquid refrigerant and allow gaseous refrigerant to be sucked into the compressors 22 and 24. One accumulator can be used in common, and will be described below as a common accumulator installed in a common flow path of the suction flow paths.

The plurality of compressors 22 and 24 may include a compressor suction pipe 31 and a compressor suction pipe 31 in which a suction flow path is connected to a cooling / heating switching valve 60 and refrigerant is sucked into the compressors 22 and 24. And an accumulator suction pipe 32 connected to the accumulator 30 and the cooling / heating switching valve 60 to suck the refrigerant into the accumulator 30.

The plurality of compressors 22 and 24 are provided with a low pressure sensor 33 for detecting a pressure of the suction flow path in the suction flow path.

The plurality of compressors 22 and 24 have a discharge flow path connected to a cooling / heating switching valve 60, and the discharge flow paths include oil separators 34 and 36 for separating refrigerant from oil, and checks to prevent backflow of the refrigerant. Valves 35 and 37 are provided.

The oil separators 34 and 36 return oil separated from the refrigerant in the oil separators 34 and 36 to one of the accumulator 30 and the compressor suction pipe 31 of the suction flow paths of the compressors 22 and 24. The oil recovery flow paths 34a and 36a to be made are connected.

The plurality of compressors 22 and 24 may include a compressor discharge pipe connected to a discharge flow path such that refrigerant is discharged from the compressors 22 and 24, oil separators 34 and 36 connected to the compressor discharge pipe, and an oil separator 34. (36) and oil separator-check valve connection pipes connected to check valves (35) (37), check valves (35) (37), check valves (35) (37) and cooling / heating switching valves (60). ), A cooling / heating switching valve-check valve connecting pipe 43 is connected.

The water-cooled outdoor heat exchanger 50 acts as a condenser in which the refrigerant is condensed in the cooling operation, and acts as an evaporator in which the refrigerant is evaporated in the heating operation, and a refrigerant passage through which the refrigerant flows is formed.

The water-cooled outdoor heat exchanger 50 is connected to a water supply device 70 which supplies a fluid (hereinafter, referred to as water) to the water-cooled outdoor heat exchanger 50 to the water-cooled outdoor heat exchanger 50. do.

The water-cooled outdoor heat exchanger (50) is formed such that a water passage through which water passes and a refrigerant passage through which the refrigerant passes, and a water inlet (62) through which water flows into the water passage and water from the water passage flow out. A water outlet 64 is formed.

The water supply device 70 includes a water supply pipe 72 connected to the water inlet 62, a water recovery pipe 74 connected to the water outlet 64, a water supply pipe 72 and a water recovery pipe 74. To adjust the amount of water passing through the water flow path of the cooling tower 76, the speed control pump 78 installed in one of the water supply pipe 72 and the water recovery pipe 74, and the water-cooled heat exchanger. And a flow rate control valve 80 installed at one of the water supply pipe 72 and the water recovery pipe 74 and capable of adjusting the opening degree.

The cooling tower 76 is disposed outside the outdoor unit O.

The water supply device 70 is provided with a temperature sensor 82 for detecting the required flow rate of water during operation of the outdoor unit (O), the temperature sensor 82 is installed in the water recovery pipe 74, the detected temperature It transmits to the control part 90 mentioned later.

Here, the water demand flow rate is the amount of water required in the water-cooled outdoor heat exchanger 50 so that the refrigerant flowing through the water-cooled outdoor heat exchanger 50 is evaporated or condensed by an appropriate amount of water. Is the required flow rate of water.

The pump 78 and the flow control valve 80 are installed in the outdoor unit O so as to be controlled by the controller 90 described later.

On the other hand, the expansion mechanism 54 does not expand the refrigerant when the refrigerant passing through the water-cooled outdoor heat exchanger 50 flows, and expands the refrigerant when the refrigerant flows toward the water-cooled outdoor heat exchanger 50. It is composed of an outdoor expansion valve installed to be located between the outdoor heat exchanger 50 and the indoor expansion valve 13, or installed between the water-cooled outdoor heat exchanger 50 and the indoor expansion valve 13, the refrigerant flow path in parallel It consists of a connected outdoor expansion valve 56 and a check valve 58.

The outdoor expansion valve 56 is made of LEV, EEV, etc., which can control the expansion of the refrigerant.

The cooling / heating switching valve 60 allows the refrigerant compressed in the compressors 22 and 24 to flow into the water-cooled outdoor heat exchanger 50 during the cooling operation, and passes through the water-cooled outdoor heat exchanger 50 during the heating operation. Flows toward the compressors 22 and 24, and is connected to the accumulator 30 and the accumulator suction pipe 32, and the check valves 35 and 37 and the cooling / heating switching valve-check valve It is connected to the connecting pipe 43, is connected to the water-cooled outdoor heat exchanger 50 and the water-cooled outdoor heat exchanger-cooling / heating switching valve connecting pipe 61, and is connected to the indoor heat exchanger 11 and the engine (16). .

3 is a control block diagram of an embodiment of a multi-type air conditioner according to the present invention.

The air conditioner according to the present embodiment operates the outdoor unit O when at least one of the indoor units is operated by an indoor unit operating unit such as a remote controller or a control panel that operates each of the indoor units 1, 2, 3, and 4. The control unit 90 further includes.

The control unit 90 is installed in the outdoor unit O and controls the compressors 22 and 24, the cooling / heating switching valve 60, the outdoor expansion valve 56, the pump 78, and the flow regulating valve 80. As an outdoor unit control unit, the indoor unit control unit is installed in each of the indoor units (1) (2) (3) and (4) by a signal line.

The control unit 90 operates at least one of the indoor unit operating units during the stop of the outdoor unit O so that the at least one indoor unit 1, 2 is operated, and the indoor unit 1 is thermo-on, that is, the air conditioner In the initial operation, the flow regulating valve 80 is opened, the pump 78 is started, and the compressors 22 and 24 are then started.

Thereafter, the control unit 90 controls the compressors 22 and 24 according to the operating capacity of the indoor units 1, 2, 3, and 4 when the air conditioner is out of the initial operation, that is, when the air conditioner is stabilized. ) And adjusts the opening of the flow regulating valve 80 and the speed of the pump 78 in response to the required water flow rate required by the outdoor unit O, particularly the water-cooled outdoor heat exchanger 50.

The controller 90 determines the water demand flow rate according to the temperature signal value detected by the temperature sensor 82, and the flow control valve 80 so that the quantity corresponding to the determined water demand flow rate is supplied to the water-cooled outdoor heat exchanger 50. It is also possible to adjust the opening degree and the speed of the pump 78.

For example, in a cooling operation, when the temperature detected by the temperature sensor 82 is lower than the set value, since a relatively large amount of water is supplied to the water-cooled outdoor heat exchanger 50, the opening degree of the flow regulating valve 80 is increased. In addition to lowering the speed of the pump 78, and conversely, if the temperature sensed by the temperature sensor 82 is higher than the set value, a relatively small amount of water is supplied to the water-cooled outdoor heat exchanger 50. In addition to increasing the opening degree of the pump 80, the speed of the pump 78 is increased. In addition, the opening degree of each flow control valve 80 and the speed of the pump 78 are determined for each temperature region sensed by the temperature sensor 82, and the flow control valve 80 according to the temperature detected by the temperature sensor 82. It is preferable that the opening degree and the speed of the pump 78 are controlled.

In addition, the controller 90 determines the water demand flow rate according to the operation rate of the compressors 22 and 24, and controls the flow rate control valve so that the quantity corresponding to the determined water demand flow rate is supplied to the water-cooled outdoor heat exchanger 50. It is also possible to adjust the opening degree of 80 and the speed of the pump 78.

For example, when the operation rate of the compressors 22 and 24 is low, a relatively small amount of refrigerant is supplied to the water-cooled outdoor heat exchanger 50, thereby lowering the opening degree of the flow regulating valve 80 and the pump 78. In the case of lowering the speed of the motor and increasing the operating rate of the compressors 22 and 24, a large amount of refrigerant is supplied to the water-cooled outdoor heat exchanger 50, thereby increasing the opening degree of the flow regulating valve 80. Speed up the pump 78. In addition, the opening rate of each flow control valve 80 and the speed of the pump 78 are determined for each operation rate region of the compressors 22 and 24 to determine the flow rate control valves according to the operation rates of the compressors 22 and 24. The opening degree of 80 and the speed of the pump 78 are preferably adjusted.

Then, the control unit 90 stops the compressors 22 and 24 when all the indoor units 1 and 2 in operation are thermo-off, and then closes the flow regulating valve 80 and stops the pump 78. Let's do it.

Here, the thermo-on is a temperature at which the indoor temperature of the indoor unit operated by the cooling operation is higher than the range of the desired temperature, or the indoor temperature of the indoor unit operated by the heating operation is lower than the range of the desired temperature, and the outdoor unit O, in particular, the compressor 22 (24) is a condition that needs to be driven, and the thermo-off is a temperature at which the indoor temperature of the indoor unit operated by the cooling operation is within the range of the desired temperature, or the indoor temperature of the indoor unit operated by the heating operation is within the range of the desired temperature. In particular, the driving conditions of the compressors 22 and 24 are unnecessary.

4 is a flowchart illustrating an embodiment of a method of operating a multi-type air conditioner according to the present invention.

One embodiment of the operation method of the multi-type air conditioner according to the present invention, the flow control valve opening and pump start step (S1) (S2) (S3), the compressor start step (S4) (S5) and the flow control valve And a pump adjustment step S6, a compressor stop step S7 and S8, and a flow control valve closing and pump stop step S9 and S10.

The flow rate control valve opening and the pump starting step (S1) (S2) include at least one (1) (2) of a plurality of indoor units (1), (2), (3), (4), and at least one of the operated indoor units. If b 1 is not thermo-on, the controller 90 closes the flow regulating valve 80 and stops the pump 78, and when at least one of the operated indoor units is thermo-on, the flow rate is adjusted. While opening the valve 80, the pump 78 is started. (S1) (S2) (S3)

Here, the plurality of indoor units (1) (2) (3) (4) is a control unit of the indoor unit in which the room temperature sensed by at least one room temperature sensor (14) of the indoor unit (1) (2) operated operation operation If it is out of the range of the desired temperature input through, the thermo is on, and if the room temperature detected by at least one indoor temperature sensor 14 of the operated indoor unit (1) (2) is the desired temperature range, the thermo off, the thermo on The control unit 90 sends out whether or not the device is thermo-off, and the controller 90 controls the outdoor unit O according to the thermo on and the thermo off.

At this time, the control unit 90 opens the flow control valve 80 to the maximum opening degree so that the water of the cooling tower 76 is quickly supplied to the water flow path of the water-cooled outdoor heat exchanger 50.

Then, the control unit 90 starts the flow rate control valve 80 and the pump 78 and starts the compressors 22 and 24 during the compressor operation waiting time without starting the compressors 22 and 24. Wait

While the water is not sufficiently supplied to the water-cooled outdoor heat exchanger 50, no refrigerant is discharged from the compressors 22 and 24, and the system is secured and reliable.

At the time of opening the flow regulating valve 80 and starting the pump 78, the water of the cooling tower 76 circulates inside the cooling tower 76 and the water flow path of the water-cooled outdoor heat exchanger 50.

On the other hand, the control unit 90 when the compressor operation wait time after the air of the compressor 22, 24, the opening of the flow rate control valve 80 and the start of the pump 78 as described above, the compressor start step (S4) (S5).

Compressor starting steps S4 and S5 are carried out when the compressor operation waiting time has elapsed after the thermo-on of at least one of the plurality of indoor units 1, 2, 3 and 4 has elapsed.

In the compressor starting steps S4 and S5, the control unit 90 starts the compressors 22 and 24, and according to the operating capacity of the indoor unit, the operation number of the compressors 22 and 24 and the variable displacement compressor 22 The frequency is determined, and the compressors 22 and 24 are controlled so that the room temperature of the indoor units 1 and 2 in which the refrigerant compressed by the compressors 22 and 24 is operated is within a desired temperature range.

In the control of the compressors 22 and 24 as described above, the multi-type air conditioner is stabilized, and then the control unit 90 performs the flow regulating valve and the pump adjusting step S6.

Flow control valve and the pump control step (S6) is to adjust the amount of water supplied to the water-cooled outdoor heat exchanger (50) to minimize the power consumption of the pump 78, the demand of the outdoor unit (O) after the compressor start step The opening degree of the flow control valve 80 is adjusted according to the flow rate, and the speed of the pump 78 is adjusted.

The required flow rate of the outdoor unit O is determined by the temperature sensed by the temperature sensor 82 or the operation rate of the compressors 22 and 24, and the temperature sensed by the temperature sensor 82 is determined by the water flow rate increase condition. If the temperature is high or the operation rate of the compressors 22 and 24 is high, and the water flow rate is high, the opening degree of the flow regulating valve 80 is increased, the pump 78 is driven at high speed, and conversely, the temperature sensor 82 is detected. When the temperature is a temperature at which the water demand flow rate decreases or the operation rate of the compressors 22 and 24 is low, the water flow rate is small, so that the opening degree of the flow regulating valve 80 is reduced, and the pump 78 is driven at a low speed.

Here, the control unit 90 is the opening degree of each flow control valve 80 and the rotation speed of the pump 78, that is, for each temperature band or the frequency bands of the compressors 22 and 24 detected by the temperature sensor 82, It has a speed, and only the water of the proper flow rate is supplied to the water-cooled outdoor heat exchanger 50 in accordance with the required flow rate of the outdoor unit, where the pump 78 is always lower than the power consumption when rotated at high speed.

As described above, when all the indoor units 1 and 2 which have been operated and operated are adjusted in the middle of adjusting the flow rate control valve 80 and the pump 78 according to the required flow rate of the outdoor unit O, the compressor 22 The compressor stop step (S7) (S8) of stopping (24) first is performed.

The control unit 90 closes and pumps the flow control valve 80 for safety and reliability that may occur when water is supplied to the water-cooled outdoor heat exchanger 50 while the refrigerant is discharged from the compressors 22 and 24. Compressors 22 and 24 are first stopped before stopping 78.

Thereafter, the flow control valve closing and pump stop step (S9) (S10) is carried out when the set time has elapsed after the compressor stop step (S9).

Here, the set time is the time taken for the system to stabilize after the compressors 22 and 24 are stopped. The system is less important for safety and reliability than the initial operation, and the water-cooled outdoor heat exchanger is performed while the compressors 22 and 24 are running. Since it is sufficient that water of the proper flow rate is supplied to the machine 50, it is set shorter than the compressor operation waiting time.

The controller 90 closes the flow regulating valve 80 and stops the pump 78 when the set time has elapsed since the compressors 22 and 24 stopped.

1 is a schematic configuration diagram of an initial operation of an embodiment of a multi-type air conditioner according to the present invention;

2 is a schematic configuration diagram of a stabilized operation of a multi-type air conditioner according to an embodiment of the present invention;

3 is a control block diagram of an embodiment of a multi-type air conditioner according to the present invention;

4 is a flowchart illustrating an embodiment of a method of operating a multi-type air conditioner according to the present invention.

<Explanation of symbols on main parts of the drawings>

22, 24: compressor 50: water-cooled outdoor heat exchanger

  70: water supply device 72; Water supply pipe

74: water recovery pipe 76: cooling tower

78; Pump 80: Flow Control Valve

90: control unit

Claims (11)

Opening and controlling a flow control valve for opening a flow regulating valve for controlling a flow rate between the water-cooled outdoor heat exchanger and the cooling tower of at least one of the plurality of indoor units, and for starting the pump between the water-cooled outdoor heat exchanger and the cooling tower; A compressor starting step of opening the flow control valve and starting the compressor after starting the pump; And a flow control valve and a pump control step of controlling the opening degree of the flow control valve and the speed of the pump in response to the required water flow rate after the compressor startup step. The method of claim 1, The water demand flow rate is a driving method of the multi-type air conditioner is determined according to the operation rate of the compressor. The method of claim 1, The water demand flow rate is a method of operating a multi-type air conditioner is determined according to the sensing temperature of the temperature sensor installed in the water recovery pipe. The method of claim 1, The compressor starting step is performed when the compressor operation waiting time elapses after the thermo-on of at least one of the plurality of indoor units. The method according to any one of claims 1 to 4, The operation method of the air conditioner includes: a compressor stopping step of stopping the compressor when all the indoor units are turned off during the flow regulating valve and the pump adjusting step; And closing the flow regulating valve and stopping the pump after the compressor stopping step. The method of claim 5, The closing of the flow control valve and the pump stop step is performed when the set time elapses after the compressor stop step. A compressor for compressing the refrigerant; A water-cooled outdoor heat exchanger for exchanging refrigerant and water; An indoor heat exchanger configured to exchange heat between the refrigerant and the indoor air; An expansion mechanism installed in a refrigerant pipe between the water-cooled heat exchanger and an indoor heat exchanger; A cooling tower connected to the water cooling heat exchanger, a water supply pipe, and a water recovery pipe; A pump which is installed at one side of the water supply pipe and the water recovery pipe and whose speed is adjustable; A flow rate control valve capable of adjusting an opening degree to adjust an amount of water passing through the water-cooled heat exchanger; Multi-type air conditioner including a control unit for controlling the opening of the flow control valve and the speed of the pump. The method of claim 7, wherein It includes a temperature sensor installed in the water recovery pipe, The control unit is a multi-type air conditioner for controlling the opening of the flow control valve and the speed of the pump in accordance with the temperature signal value detected by the temperature sensor. The method of claim 7, wherein The control unit is a multi-type air conditioner for controlling the opening of the flow rate control valve and the speed of the pump in accordance with the operation rate of the compressor. The method of claim 7, wherein The compressor, the water-cooled outdoor heat exchanger, the flow control valve, and the control unit are disposed in the outdoor unit, The cooling tower is a multi-type air conditioner disposed outside the outdoor unit. The method of claim 10, The pump is a multi-type air conditioner disposed inside the outdoor unit.

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