KR100244339B1 - Airconditioner dehumidifying device and its control method - Google Patents

Abstract

The present invention relates to a dehumidifying apparatus of an air conditioner and a control method thereof. The present invention relates to a compressor for compressing a refrigerant, an outdoor heat exchanger for cooling and condensing a gas refrigerant of high temperature and high pressure compressed by the compressor, and condensed in the outdoor heat exchanger. An air conditioner in which an air conditioner circulates a refrigerant to form a cooling and dehumidification cycle in order of a capillary tube for expanding a low-temperature high-pressure liquid refrigerant and an indoor heat exchanger for evaporating a low-temperature low-pressure free refrigerant expanded in the capillary. An outdoor valve for controlling the flow of the refrigerant so that the refrigerant condensed in the capillary tube and a part of the indoor heat exchanger flows, a dehumidifying capillary tube expanding the condensed refrigerant while passing through the part of the indoor heat exchanger, and the indoor heat exchanger Coolant passing through a portion of the refrigerant flows into the other part of the dehumidifying capillary tube and the indoor heat exchanger. An indoor valve for controlling the flow of air, and control means for controlling the drive of the outdoor and indoor valves to change the flow of the refrigerant flowing into the capillary tube and the indoor heat exchanger during the cooling and dehumidification operation, during the dehumidification operation Part of the indoor heat exchanger is configured as a condenser to improve the dehumidification efficiency without lowering the room temperature.

Description

Dehumidifier of air conditioner and control method

The present invention relates to an air conditioner, and more particularly, to a dehumidifying apparatus of an air conditioner and a method of controlling the air conditioner, which is configured to form a part of an indoor heat exchanger as a condenser and removes only moisture without lowering the room temperature during dehumidification operation.

In general, air conditioners are classified into various types according to their function or configuration of the unit. In terms of function, air conditioners can be classified into cooling only, cooling and dehumidification only, and cooling and heating. It is divided into an integrated type that is installed in a window and the like and a separate type that separates and installs a cooling device on the indoor side and a heat dissipation and compression device on the outdoor side.

The separate type air conditioner includes a multi type for air conditioning a plurality of indoor spaces by connecting two or more indoor units to one outdoor unit.

In the conventional separate type air conditioner, as shown in FIG. 1, the indoor unit 10 installed indoors and the outdoor unit 20 installed outdoors operate as one system, and heating and cooling operations as necessary. Can be.

The outdoor unit 20 includes a compressor 30 for compressing a refrigerant into a gaseous state of high temperature and high pressure, and a low temperature by heat-exchanging the gas refrigerant compressed to high temperature and high pressure in the compressor 30 by air blown by an outdoor fan (not shown). An outdoor heat exchanger (40) for cooling and condensing with a high pressure liquid refrigerant, and a capillary tube (50) for decompressively expanding the low temperature and high pressure liquid refrigerant cooled and condensed in the outdoor heat exchanger (40) to a low temperature and low pressure free phase refrigerant which is easy to evaporate. The indoor unit 10 converts the low-temperature, low-pressure free refrigerant passing through the capillary tube 50 into a completely low-temperature, low-pressure, fully gaseous refrigerant gas while heat-exchanging it with air blown by an indoor fan (not shown). An indoor heat exchanger (60) is installed.

The indoor heat exchanger (60) has an inlet distributor (70) for distributing the refrigerant introduced from the capillary tube (50) on one side thereof, and a refrigerant passing through the indoor heat exchanger (60) through respective outlets on the other side thereof. Is provided with an outlet distributor (80) to allow flow to one connection pipe (81), and the indoor heat exchanger (60) is provided with three inlet distributors (71) (72) from the inlet distributor (70). The first, second and third refrigerant path lines 61, 62 and 63 are configured such that the refrigerant distributed in the " 73 " forms one line.

Refrigerant inlets 61a into which the refrigerant flows into the first, second, and third refrigerant path lines 61, 62, 63 from the inlet side branch pipes 71, 72, 73 at their inlet sides, respectively. 62a and 63a, and refrigerant outlets 61b, 62b and 63b are formed at the outlet side thereof, and outlet branch branches 74 at the refrigerant outlets 61b, 62b and 63b. 75 and 76 are connected, and the refrigerant flowing through the outlet branch pipes 74 and 75 and 76 respectively flows from the outlet distributor 80 to one connection pipe 81 and the compressor 30. To form a refrigerant cycle.

In the air conditioner configured as described above, since the refrigerant cycles of the cooling operation and the dehumidification operation are the same in the cooling and dehumidification operation, the refrigerant cycle is made in the solid arrow direction of FIG. 1.

First, when the high temperature and high pressure gas refrigerant discharged from the compressor 30 of the outdoor unit 20 flows into the outdoor heat exchanger 40, the outdoor heat exchanger 40 stores the gas refrigerant compressed to high temperature and high pressure by an outdoor fan. Heat exchanged with the air blown by forced cooling to condense, the low-temperature high-pressure liquid refrigerant condensed in the outdoor heat exchanger 40 is introduced into the capillary tube (50).

The low-temperature and high-pressure liquid refrigerant introduced into the capillary tube 50 is expanded into a low-temperature, low-pressure free refrigerant which is easy to evaporate, and is divided into three inlet-side branch pipes 71 distributed by the inlet-side distributor 70 installed in the indoor unit 10 ( Indoor fan when it evaporates and vaporizes through the first to third refrigerant pass lines 61, 62 and 63 through the 72 and 73, respectively, and exits to the outlet branch pipes 74 and 75 and 76, respectively. Take the heat from the air blown by the air to cool the indoor air, and then discharge the cooled air (cold air) into the room to perform cooling or dehumidification operation, and the low-temperature low-pressure gas refrigerant cooled by the indoor heat exchanger (60). Is again introduced into the compressor 30 is converted into a refrigerant gas of a high temperature and high pressure by the adiabatic compression action of the compressor 30 to repeat the refrigerant cycle described above.

At this time, if the indoor unit 10 is a cooling operation, the indoor fan is driven according to the air volume set by the user to perform the cooling operation. If the indoor unit 10 is a dehumidification operation, the air volume of the indoor fan is lowered to perform the dehumidification operation.

By the way, in the conventional dehumidification operation method, when the indoor temperature is appropriate or low during the rainy season or the like and the humidity is high, the dehumidification operation is performed by lowering only the air volume in the room with the same refrigerant cycle as the cooling operation. Since the heat exchanged air temperature in the low temperature is discharged because the actual room temperature is dropped to feel cold, the indoor heat exchanger (60) had a problem that the dehumidification efficiency is lowered too low.

In addition, even when the user wants to perform a dehumidification operation while raising the indoor temperature, the conventional dehumidification operation has a problem in that the indoor temperature cannot be controlled because the user cannot set the indoor temperature.

Accordingly, the present invention has been made to solve the above-described problems, and when the dehumidification operation is configured as a part of the indoor heat exchanger as a condenser, even if the room temperature is lowered, it is used as part of the indoor heat exchanger and the indoor heat exchanger. It is an object of the present invention to provide a dehumidifying apparatus for an air conditioner and a control method thereof, in which the temperature of an indoor heat exchanger is increased without lowering the room temperature because the heat is discharged.

In order to achieve the above object, a dehumidifying apparatus of an air conditioner according to the present invention includes a compressor for compressing a refrigerant, an outdoor heat exchanger for cooling and condensing a gas refrigerant of high temperature and high pressure compressed by the compressor, and condensed in the outdoor heat exchanger. An air conditioner in which an air conditioner circulates a refrigerant to form a cooling and dehumidification cycle in order of a capillary tube for expanding a low-temperature high-pressure liquid refrigerant and an indoor heat exchanger for evaporating a low-temperature low-pressure free refrigerant expanded in the capillary. An outdoor valve for controlling the flow of the refrigerant so that the refrigerant condensed in the capillary tube and a part of the indoor heat exchanger flows, a dehumidifying capillary tube expanding the condensed refrigerant while passing through the part of the indoor heat exchanger, and the indoor heat exchanger Refrigerant passing through a portion of the dehumidifying capillary and other parts of the indoor heat exchanger And an indoor valve for controlling the flow of the lock refrigerant, and control means for controlling the driving of the outdoor and indoor valves to change the flow of the refrigerant flowing into the capillary tube and the indoor heat exchanger during cooling and dehumidification operation. It is done.

In addition, the dehumidification control method of the air conditioner according to the present invention includes an operation determination step of determining whether the operation condition selected by the user is cooling and dehumidifying operation, and if the cooling operation is performed at the operation determination step, the outdoor valve is turned off by turning off the outdoor valve. The refrigerant condensed in the capillary tube, the indoor valve is turned on to configure the entire indoor heat exchanger as an evaporator to perform a cooling operation, and a dehumidification operation in the operation determination step to turn on the outdoor valve. The refrigerant condensed in the outdoor heat exchanger passes through a part of the indoor heat exchanger to condense again, and the indoor valve is turned off to introduce the refrigerant passing through the part of the indoor heat exchanger into the dehumidifying capillary to perform a dehumidification operation. Characterized in that the operation step made.

1 is a refrigerant cycle diagram of a conventional air conditioner.

2 is a refrigerant cycle diagram of an air conditioner according to the present invention.

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

4 is a flowchart showing the operation procedure of the dehumidification control of the air conditioner according to the present invention.

<Explanation of symbols for main parts of drawing>

10: indoor unit 20: outdoor unit

30: compressor 40: outdoor heat exchanger

50: capillary 60: indoor heat exchanger

61, 62, 63: 1st, 2nd, 3rd refrigerant path line 110: Outdoor side solenoid valve

120: dehumidification capillary 130: indoor solenoid valve

152: operation operation means 154: control means

168: solenoid valve driving means

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

2 is a refrigerant cycle diagram of an air conditioner according to the present invention, and the same reference numerals are used for the same parts as in the conventional configuration.

As shown in FIG. 2, in an air conditioner having an indoor unit 10 and an outdoor unit 20, the outdoor unit 20 includes a compressor 30 for compressing a refrigerant into a gaseous state of high temperature and high pressure, and the compressor ( 30) an outdoor heat exchanger (40) for heat-condensing the gas refrigerant compressed to high temperature and high pressure with air blown by an outdoor fan (not shown) and cooling and condensing the liquid refrigerant with low temperature and high pressure, and cooling in the outdoor heat exchanger (40). Capillary tube 50 for decompressively expanding the condensed low-temperature high-pressure liquid refrigerant into a low-temperature, low-pressure free refrigerant which is easy to evaporate, and connected to both ends of the capillary tube 50 to be condensed in the outdoor heat exchanger 40 during dehumidification operation. The outdoor side solenoid valve 110 (outdoor side valve) for controlling the refrigerant to flow into the first refrigerant pass line of the indoor heat exchanger to be condensed again without passing through the capillary tube 50 is installed.

In the indoor unit 10, a low-temperature, low-pressure free refrigerant passing through the capillary tube 50 is converted into a low-temperature, low-pressure, fully gaseous refrigerant gas while being evaporated by heat exchange with air blown by an indoor fan (not shown). A heat exchanger (60) is installed, and the indoor heat exchanger (60) includes a first refrigerant pass line (61) in which a refrigerant flows from the capillary tube (50) to form one refrigerant line, and the first refrigerant pass line. The refrigerant passing through the 61 is distributed to two inlet branch pipes 91 and 92 branched through the inlet distributor 90 so as to form one line, and thus the second and third refrigerant pass lines 62 ( 63, and an outlet distributor 100 is installed to allow the refrigerant passing through the second and third refrigerant path lines 62 and 63 to flow into one connection pipe 101.

Refrigerant inlets 61a, 62a and 63a through which refrigerant flows into the first, second and third refrigerant path lines 61, 62 and 63, and refrigerant outlets 61b and 62b on the outlet side thereof. ) 63b is formed.

In addition, the dehumidification capillary tube 120 for expanding the condensed refrigerant passing through the first refrigerant path line 61 and the first refrigerant path line 61 connected to both ends of the dehumidification capillary tube 120 during dehumidification operation. The solenoid valve 130 for controlling the refrigerant condensed again in the dehumidifying capillary tube (130) and the refrigerant expanded in the dehumidifying capillary tube 120 to evaporate the refrigerant gas of low temperature and low pressure Second and third refrigerant pass lines 62 and 63 of the indoor heat exchanger 60 are included.

The outdoor solenoid valve 110 is opened to block the refrigerant flowing into the capillary tube 50 during the dehumidification operation, and closed to allow the refrigerant to flow into the capillary tube 50 during cooling, and the indoor solenoid valve 130 is closed. Is closed so that the refrigerant flows into the dehumidification capillary tube 120 during the dehumidification operation, and is opened to block the refrigerant flowing into the dehumidification capillary tube 120 at the time of cooling.

A circuit block diagram for controlling the dehumidification operation of the air conditioner configured as described above will be described with reference to FIG.

As shown in FIG. 3, the power supply means 150 converts a commercial AC voltage supplied from an AC power supply terminal (not shown) into a predetermined DC voltage required for the operation of the air conditioner, and outputs the same. Is the operating mode of the air conditioner (automatic, cooling, dehumidification, blowing, heating, etc.), the amount of air discharged through the discharge port (strong wind, weak wind, breeze, etc.) and the desired temperature (Ts; or less, the set temperature And a plurality of function keys for inputting an operation start signal and an operation stop signal of the air conditioner.

In addition, the control means 154 receives the DC voltage output from the power supply means 150 to initialize the air conditioner, as well as the air conditioner according to the operation selection signal input by the operation operation means 152. As a microcomputer for controlling the overall operation of the machine, the control means 154 is an outdoor side to open and close the flow of the refrigerant flowing into the capillary tube 50 and the dehumidification capillary tube 120 according to the operating conditions during the cooling operation and dehumidification operation And controlling the driving of the indoor solenoid valves 110 and 130.

The indoor temperature detecting means 156 controls the indoor temperature to a temperature Ts set by the user by the driving operation means 152 to suck the indoor air 10 into the indoor unit 10 to perform the cooling and heating operation of the air conditioner. The temperature (Tr) of the sensor is detected.

In addition, the wind direction control means 160 drives the compressor to control the wind direction motor 161 to vertically and horizontally adjust the direction of the discharged air so that the air heat exchanged by the indoor heat exchanger 60 is evenly spread throughout the room. The means 162 controls the control means 154 according to the difference between the temperature Ts set by the user by the driving operation means 152 and the room temperature Tr sensed by the room temperature sensing means 156. The control signal output from the control drive the compressor (30).

The outdoor fan motor driving means 164 is controlled according to the difference between the temperature Ts set by the user by the driving operation means 152 and the room temperature Tr sensed by the indoor temperature sensing means 156. Receiving a control signal output from the means 154 to drive the outdoor fan 165 by controlling the rotation speed of the outdoor fan motor to blow the air heat exchanged in the outdoor heat exchanger 40 to the outside, and drive the indoor fan motor The means 166 receives the control signal output from the control means 154 according to the air volume set by the user by the operation operation means 152 (air or cold air heat exchanged in the indoor heat exchanger 60). Drive the indoor fan 167 by controlling the rotation speed of the indoor fan motor to blow the indoors.

In addition, in the drawing, the solenoid valve driving means 168 is a flow of the refrigerant flowing into the capillary tube 50 and the dehumidifying capillary tube 120 according to the operating conditions (cooling or dehumidification) input by the driving operation means 152. Receiving the control signal output from the control means 154 to open and close the drive control the outdoor and indoor solenoid valve 110, 130, the display means 170 in accordance with the control of the control means 154 In addition to displaying the operation selection mode (automatic, cooling, dehumidification, blowing, heating, etc.) input by the operation operation means 152, the operation state of the air conditioner is displayed.

Hereinafter, the operation and effect of the dehumidifier and the control method of the air conditioner configured as described above will be described.

4 is a flowchart showing an operation procedure of the dehumidification control of the air conditioner according to the present invention, in which S denotes a step.

First, when power is applied to the air conditioner, the power supply unit 150 converts a commercial AC voltage supplied from an AC power terminal (not shown) into a predetermined DC voltage required for driving the air conditioner, thereby driving each circuit and control means ( 154).

Therefore, in step S1, the DC voltage output from the power supply means 150 is received by the control means 154 to initialize the air conditioner.

At this time, when the user operates the operation operation means 152 and presses the operation key, and inputs the operation mode (for example, cooling or dehumidification), the set air volume, and the set temperature (Ts) of the desired air conditioner, the operation is performed. An operation selection signal and an operation start signal (hereinafter referred to as an operation signal) are input from the operation means 152 to the control means 154.

Accordingly, in step S2, the control means 154 determines whether the driving signal is input from the driving operation means 152, and maintains the air conditioner in the operating standby state when the driving signal is not input (NO). The operation of step S2 and below is repeated.

As a result of the discrimination in step S2, when the operation signal is input (YES), the process proceeds to step S3, and the control means 154 determines whether the operation mode input by the operation operation means 152 is the cooling operation, In the case of the cooling operation (YES), the control means 154 proceeds to step S4 and outputs a control signal for driving the outdoor and indoor solenoid valves 110 and 130 to the solenoid valve driving means 168.

Accordingly, the solenoid valve driving means 168 turns off the outdoor solenoid valve 110 under the control of the control means 154, and turns on the indoor solenoid valve 130 to cool the compressor 30 to the outdoor heat exchange. (40) → capillary tube (50) → the first refrigerant pass line (61) of the indoor heat exchanger (60) → the indoor solenoid valve (130) → the inlet distributor (90) → the second and third refrigerant pass lines ( 62) (63) → outlet distributor 100 → compressor 33 to form a refrigerant cycle.

Subsequently, in step S5, the control means 154 outputs a control signal for driving the indoor fan 167 to the indoor fan motor driving means 166 to perform the cooling operation.

Therefore, the indoor fan motor driving means 166 receives the control signal output from the control means 154 according to the set air volume to control the rotation speed of the indoor fan motor to drive the indoor fan 167.

When the indoor fan 167 is driven, the indoor air starts to be sucked into the indoor unit 10 through an inlet not shown, and at this time, the indoor temperature (Tr) of the indoor air sucked into the indoor unit 10 is measured by the indoor temperature. Detect at 156.

Accordingly, in step S6, the control means 154 receives the analog data of the room temperature Tr sensed by the room temperature sensing means 156 and converts it into digital so that the room temperature Tr is set to the set temperature Ts. If the indoor temperature Tr is not greater than the set temperature Ts (NO), it is not necessary to cool the room, and the process returns to the step S5 to continuously detect the indoor temperature Tr. The operation of step S5 or less is repeated.

As a result of the determination in step S6, when the room temperature Tr is larger than the set temperature Ts (YES), the room must be cooled. In step S7, the control means 154 controls the room temperature Tr and the set temperature. The operation frequency of the compressor 30 is determined according to the difference of Ts, and a control signal for driving the compressor 30 is output to the compressor driving means 122.

Accordingly, the compressor driving means 122 drives the compressor 30 according to the operating frequency determined by the control means 104.

When the compressor 30 is driven, the refrigerant compressed by the compressor 30 into the high temperature and high pressure gas is introduced into the outdoor heat exchanger 40 in step S8, and the outdoor heat exchanger 40 is compressed to the high temperature and high pressure. The gas refrigerant is heat-exchanged with air blown by the outdoor fan 165 and forcedly cooled to condense. The low-temperature, high-pressure liquid refrigerant condensed in the outdoor heat exchanger 40 is turned off (closed). Since the state is introduced into the capillary tube (50).

The low-temperature, high-pressure liquid refrigerant introduced into the capillary tube 50 is expanded into a low-temperature, low-pressure free refrigerant which is easy to evaporate, and thus the refrigerant inlet of the first refrigerant pass line 61 of the indoor heat exchanger 60 installed in the indoor unit 10 ( It flows in through 61a) and flows out to the refrigerant outlet 61b.

In this way, the refrigerant passing through the first refrigerant path line 61 is the on-side (open) state of the solenoid valve 130 is on (open) state, without passing through the dehumidifying capillary tube 120, the inlet distributor ( 90 is simultaneously distributed to the refrigerant inlets 62a and 63a of the second and third refrigerant path lines 62 and 63 and flows out to the refrigerant outlets 62b and 63b.

When the refrigerant evaporates and vaporizes in the indoor heat exchanger (60) by a series of processes, the heat is removed from the air blown by the indoor fan (167), and the indoor air is cooled. The low temperature and low pressure gas refrigerant cooled in the indoor heat exchanger 60 flows back into the compressor 30 and is converted into a high temperature and high pressure refrigerant gas by the adiabatic compression action of the compressor 30. 2, the refrigerant cycle is repeated while the refrigerant cycle is repeated according to the solid arrow direction of FIG. 2.

In the cooling operation of the air conditioner as described above, in step S9, the control means 154 determines whether the user has switched to the dehumidification operation by operating the operation operation means 152, and does not switch to the dehumidification operation (NO day). Is returned to the step S8, and the cooling operation is continued and the operation of step S8 or less is repeatedly performed.

As a result of the discrimination in step S9, in the case of switching to the dehumidification operation (YES), the flow goes to step S10, and the control means 154 solenoids control signals for driving the outdoor and indoor solenoid valves 110 and 130. Output to the valve drive means 168.

Accordingly, the solenoid valve driving means 168 turns on the outdoor solenoid valve 110 under the control of the control means 154, and turns off the indoor solenoid valve 30 to turn off the refrigerant from the compressor 30 to the outdoor heat exchange. (40) → outdoor solenoid valve (110) → first refrigerant pass line (61) of indoor heat exchanger (60) → dehumidifying capillary tube (120) → inlet distributor (90) → second and third refrigerant pass lines A refrigerant cycle circulated in the order of (62) (63)-> outlet distributor 100-> compressor 30 is formed.

When the outdoor solenoid valve 110 is turned on and the indoor solenoid valve 130 is turned off, in step S11, the refrigerant compressed by the compressor 30 into a gas of high temperature and high pressure is introduced into the outdoor heat exchanger 40, In the outdoor heat exchanger (40), the gas refrigerant compressed at high temperature and high pressure is condensed by forced cooling by heat exchange with air blown by the outdoor fan (165), and the low temperature and high pressure liquid refrigerant condensed in the outdoor heat exchanger (40). Since the outdoor solenoid valve 110 is on (opened), the first refrigerant pass line of the indoor heat exchanger 60 installed in the indoor unit 10 through the outdoor solenoid valve 110 without passing through the capillary tube 50 ( Condensation again.

The low temperature and high pressure liquid refrigerant condensed again in the first refrigerant pass line 61 of the indoor heat exchanger 60 is easy to evaporate through the dehumidifying capillary tube 120 because the solenoid valve 130 is turned off (closed). It expands into a low-temperature, low-pressure free refrigerant and simultaneously flows from the inlet distributor 90 to the refrigerant inlets 62a and 63a of the second and third refrigerant pass lines 62 and 63, respectively, and the refrigerant outlets 62b and 63b. Out).

The dehumidification operation is performed without mixing the air discharged from the first refrigerant pass line 61 of the indoor heat exchanger 60 and the existing discharge air by a series of processes and reducing the room temperature. The low-temperature low-temperature gas refrigerant cooled in the machine 60 is introduced into the compressor 30 again, and converted into a high-temperature high-pressure refrigerant gas by the adiabatic compression action of the compressor 30 to form a refrigerant cycle along the dotted arrow direction of FIG. 2. As long as it does not switch to a cooling operation while repeating, the operation of step S3 or less is repeated, performing room dehumidification continuously.

On the other hand, when the determination result in step S3 is not a cooling operation (NO), the process proceeds to step S10 and repeats the operation of step S10 or less.

According to the dehumidifying apparatus and the control method of the air conditioner according to the present invention as described above, a part of the indoor heat exchanger is configured as a condenser during the dehumidification operation, even if the room temperature drops, the condenser of the indoor heat exchanger and the indoor heat exchanger Since the heat is discharged from the place used, the temperature of the indoor heat exchanger is high without lowering the room temperature, thereby improving the dehumidification efficiency.

Claims (2)

A compressor for compressing the refrigerant, an outdoor heat exchanger for cooling and condensing the high temperature and high pressure gas refrigerant compressed by the compressor, a capillary tube for expanding the low temperature and high pressure liquid refrigerant condensed in the outdoor heat exchanger, and a low temperature expanded in the capillary tube In the air conditioner circulating the refrigerant in the order of the indoor heat exchanger to evaporate the low-pressure free refrigerant to form a cooling and dehumidification cycle, the refrigerant condensed in the outdoor heat exchanger during the dehumidification operation is connected to both ends of the capillary tube It is introduced into a portion of the indoor heat exchanger without passing through and is opened again to condense, and the outdoor valve is closed so that refrigerant condensed in the outdoor heat exchanger flows into the capillary tube during the cooling operation, and condenses again while passing through a portion of the indoor heat exchanger A dehumidification capillary for expanding the refrigerant, and connected to both ends of the dehumidifying capillary During the dehumidification operation, the refrigerant passing through the part of the indoor heat exchanger is closed to flow into the dehumidification capillary tube, and during the cooling operation, the refrigerant passing through the part of the indoor heat exchanger flows into the other part of the indoor heat exchanger without passing through the dehumidification capillary tube. An indoor valve that is opened and control means for outputting a control signal for controlling the driving of the outdoor and indoor valves so as to change the flow of refrigerant flowing into the capillary tube and the indoor heat exchanger during cooling and dehumidification operation. Dehumidifier of the air conditioner characterized in that. The operation judging step of determining whether the operation condition selected by the user is cooling or dehumidifying operation, and if the cooling operation is performed in the operation judging step, closes the outdoor valve so that the refrigerant condensed in the outdoor heat exchanger flows directly into the capillary tube, Cooling cycle step that operates the cooling cycle by opening the valve so that the refrigerant passing through the part of the indoor heat exchanger flows directly to the other part of the indoor heat exchanger and constitutes the entire evaporator of the indoor heat exchanger, and the dehumidification in the operation determination step. In operation, open the outdoor valve to allow the refrigerant condensed in the outdoor heat exchanger to flow into the part of the indoor heat exchanger to condense again, and close the indoor valve to allow the refrigerant passing through the part of the indoor heat exchanger to the dehumidifying capillary tube. Dehumidification cycle step of operating the dehumidification cycle characterized in that Dehumidification control method based flame.

Images