KR20070112334A - Air conditioner - Google Patents

Abstract

An air conditioner is provided to perform reheating after completing dehumidification to prevent dewing in a fan structure and minimize a pressure loss of a refrigerant in reheating and dehumidification processes. A cabinet(11) includes a plurality of apertures. A heat exchanger(14) is installed in the cabinet and is divided into a reheating part heating sucked air in case of reheating operation and dehumidifying operation, and a dehumidifying part cooling the sucked air. A fan(13) is installed in the cabinet for sucking in air. In case of reheating operation and dehumidifying operation, air is sucked in and discharged in one direction to pass through the dehumidifying part and the reheating part in order.

Description

Air Conditioner

1 is a perspective view showing the indoor unit structure of a conventional air conditioner equipped with a reheat and dehumidification function.

2 is a system diagram schematically showing a system configuration for reheating and dehumidifying the indoor unit.

Figure 3 is a side cross-sectional view showing the indoor unit of the air conditioner with a reheat and dehumidification function according to the spirit of the present invention.

Figure 4 is a block diagram schematically showing the internal configuration and the flow of the refrigerant of the air conditioner indoor unit having the above configuration.

Figure 5 is a side cross-sectional view showing a state in which the indoor unit reheating and dehumidification operation according to the spirit of the present invention.

Figure 6 is a block diagram showing the flow of the refrigerant during the reheat and dehumidification operation is performed.

7 is a system block diagram showing a reheat and dehumidification process according to another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: indoor unit 11: cabinet

12 air guide 13 blowing fan

14: heat exchanger 15: front panel

16: expansion valve 17: opening and closing valve

The present invention relates to an air conditioner, and more particularly, to allow the indoor air sucked during the reheating and dehumidifying operation to be reheated after the dehumidification is completed, and to minimize the pressure loss of the refrigerant during the reheating and dehumidifying process. It relates to a heat exchanger structure of a conditioner.

In general, an air conditioner is a home appliance that exchanges indoor air with a refrigerant having a low temperature or high temperature to be changed into a high temperature or low temperature state and then discharged back to the room, thereby maintaining the indoor state in a cooling state or a heating state.

In detail, an air conditioner for heating and cooling purposes includes an indoor heat exchanger for exchanging indoor air and a refrigerant, an outdoor heat exchanger for exchanging outdoor air and a refrigerant, an compressor for compressing the refrigerant at high temperature and high pressure, and an expansion valve for expanding the refrigerant at low temperature and low pressure. It is composed.

In addition, in the cooling mode, the refrigerant having a high temperature and high pressure flows into the outdoor heat exchanger, and in the heating mode, the refrigerant having a low temperature and low pressure flows into the outdoor heat exchanger. The indoor heat exchanger exchanges heat between the refrigerant and the indoor air, and the outdoor heat exchanger exchanges heat between the refrigerant and the outdoor air.

1 is a perspective view showing the indoor unit structure of a conventional air conditioner equipped with a reheat and dehumidification function, Figure 2 is a system diagram schematically showing a system configuration for the reheat and dehumidification of the indoor unit.

1 and 2, the indoor unit 1 of an air conditioner equipped with a conventional reheating and dehumidifying function includes a cabinet 2 forming an appearance and a heat exchanger in which a plurality of pipes are connected to the inside of the cabinet 2. (5) and a fan (4) mounted on the rear side of the heat exchanger (5) to draw in and out the indoor air.

In detail, a suction port 3 is formed at the front and an upper side of the cabinet 2, and a discharge port 6 is formed at the lower side. The heat exchanger 5 is divided into a reheating unit 7 performing a reheating function and a dehumidifying unit 8 performing a dehumidifying function in a reheating and dehumidifying process. In more detail, the refrigerant passing through the compressor or the expansion valve passes through the reheating unit 7 and then passes through the dehumidifying unit 8 to be reintroduced into the expansion valve or the compressor.

In addition, an opening / closing valve 9 and an expansion valve 91 are connected in parallel between the reheating unit 7 and the dehumidifying unit 8. In detail, in the normal cooling or heating operation, the refrigerant passing through the reheating unit 7 is concentrated to a point, and then flows into the dehumidifying unit 8 through the opening / closing valve 9. Then, the refrigerant passing through the dehumidifying unit 8 is concentrated again to point b and then discharged to the outside of the indoor unit.

On the other hand, in the reheating and dehumidifying operation, the opening / closing valve 9 is closed so that the refrigerant concentrated at the point a passes through the expansion valve 91. The refrigerant passing through the expansion valve 91 is throttled to low temperature and low pressure, and then flows into the dehumidifying part 8. Here, the expansion valve 91 is used as a means for causing the indoor heat exchanger to be divided into the reheating unit 7 and the dehumidifying unit 8 during the reheating and dehumidifying operation. In the reheating and dehumidifying operation, the compressor frequency is sufficient to be operated in a lower state than the normal cooling and heating operation. Therefore, the amount of the refrigerant flowing inside the heat exchanger is smaller than that of the normal heating and cooling operation.

In the indoor unit of the air conditioner with a conventional reheating and dehumidifying function having the above configuration, when the normal cooling or heating operation is performed, the heat exchanger (5) is not divided into a reheating unit and a dehumidifying unit, and the refrigerant Is maintained at a uniform pressure. In other words, the entire heat exchanger 5 performs the function of the evaporator in the cooling mode and the function of the condenser in the heating mode. Therefore, the indoor air sucked through the suction port 3 is cooled to a set temperature and discharged back into the room through the discharge port 6.

On the other hand, when the reheating and dehumidifying operation is performed, the heat exchanger 5 includes a reheating unit 7 for heating the sucked indoor air and a dehumidifying unit 8 for cooling the sucked indoor air to condense moisture contained in the air. Are divided into This is done by passing the refrigerant through the expansion side 91 mentioned above.

Therefore, as shown in FIG. 1, the indoor air sucked through the suction port 3 is discharged through the discharge port 6 after reheating and dehumidification are performed.

However, in the conventional air conditioner indoor unit as shown, there is a problem that the indoor air sucked through the inlet 3 is discharged without performing the ideal constant temperature dehumidification.

In detail, the indoor air sucked into the front suction port close to the dehumidifying part 8 is cooled to a low temperature, but dehumidification is performed, but it does not pass through the reheating part 7 and thus cannot be reheated to room temperature. In addition, the indoor air sucked into the upper suction port close to the reheating part 7 is reheated while passing through the reheating part 7, but fails to pass through the dehumidifying part 8 to prevent moisture from being removed.

In this case, a phenomenon in which two kinds of air are mixed around the fan 4 occurs. In other words, dehumidified but not reheated air and reheated but not dehumidified air are mixed around the fan 4.

In this case, when two types of air that are not subjected to both reheating and dehumidification are mixed only one step, moisture may not be sufficiently removed, and the indoor air discharged may not be maintained at room temperature.

In addition, moisture condenses around the fan 4 and agglomerates on the surface of the fan, or scatters in all directions by the fan, causing the internal parts to corrode.

Meanwhile, in the reheating and dehumidifying operation process, as shown in FIG. 2, the refrigerant of the reheating unit 7 must be concentrated to one point a and then pass through the expansion valve 91 to move to the dehumidifying unit 8. Then, the refrigerant passing through the dehumidifying unit 8 is concentrated again to a point (b) and then discharged from the indoor heat exchanger.

In this case, the end point of the reheater and the start point of the dehumidifier must be concentrated at one point, so that the pressure drop is large and the heat exchanger design is limited.

In addition, when the heat exchanger becomes large or the diameter of the refrigerant pipe becomes small, a problem arises in that it is impossible to add a reheating and dehumidifying module.

In addition, since all the heat exchangers must be driven regardless of the heating / cooling mode and the reheating and dehumidifying mode, the compression work is increased and the overall efficiency is reduced.

 The present invention has been proposed in order to solve the above problems, the air sucked into the indoor unit and the discharged air to form one direction, the air to perform another process after any one of the reheat and dehumidification process is completely performed The purpose is to provide a harmonic.

In addition, it is an object to provide an air conditioner that solves the pressure drop problem of the pipe by allowing the end of the reheating portion and the starting point of the dehumidification portion to be concentrated at one point, and to enable a variety of piping design.

In addition, an object of the present invention is to provide an air conditioner that can freely add a reheat dehumidification module regardless of the size of the heat exchanger or the diameter of the refrigerant pipe.

In addition, an object of the present invention is to provide an air conditioner that can freely adjust the number of heat exchangers driven according to an operation mode to increase energy efficiency.

Air conditioner according to the present invention for achieving the above object is a cabinet including a plurality of openings; A heat exchanger installed inside the cabinet and separated into a reheating unit for heating the sucked air during a reheating and dehumidifying operation and a dehumidifying unit for cooling the sucked air; and a fan provided in the cabinet to suck air; During the reheat and dehumidification operation, air is sucked and discharged in one direction, and the air passes through the dehumidifying unit and the reheating unit of the heat exchanger in sequence.

According to another aspect of the present invention, an air conditioner includes: a cabinet including a plurality of openings for air intake and discharge during reheating and dehumidification operation; and a plurality of heat exchangers installed inside the cabinet; The expansion member is provided between the plurality of heat exchangers, the expansion member to selectively pass the refrigerant in accordance with the operation mode, characterized in that the number of the heat exchanger is driven in accordance with the heating and cooling operation or reheating and dehumidification operation.

By the above configuration, the indoor air sucked during the reheating and dehumidifying operation is completely subjected to the dehumidification process, and then the reheating process is performed, thereby preventing dew condensation inside the fan or other structure.

 Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other embodiments included within the scope of other inventive inventions or the scope of the present invention can be easily made by adding, changing, or deleting other elements. I can suggest.

3 is a side sectional view showing an indoor unit of an air conditioner equipped with a reheating and dehumidifying function according to the spirit of the present invention.

Referring to Figure 3, a cross-sectional view showing a process of performing the cooling or heating process in the indoor unit of the air conditioner according to the present invention, it shows that the indoor air sucked is cooled or heated and discharged back to the room.

In detail, the indoor unit 10 of the air conditioner according to the present invention includes a cabinet 11 forming an external shape, a front panel 15 installed to be swingable in front of the cabinet 11, and the cabinet 11 inside. A heat exchanger 14 arranged in an up and down direction, at least one blower fan 13 installed on a rear surface of the heat exchanger 14 to suck indoor air, and an inner rear surface of the cabinet 11. An air guide 12 is provided for guiding the flow of the discharged air.

In more detail, the front panel 15 is installed to be able to translate back and forth from the cabinet 11. In addition, during the cooling or heating operation, the front panel 15 moves forward to form an inlet for intake of indoor air between the front panel 15 and the front surface of the cabinet 11.

In addition, the blower fan 13 may be a cross flow fan, and the heat exchanger 14 forms a structure in which a plurality of small heat exchangers are connected to each other. In detail, the heat exchanger 14 includes a first heat exchanger 141 for heating the indoor air in a reheating and dehumidifying operation of indoor air, and a second heat exchanger 142 for cooling the indoor air to condense moisture. . However, in the normal cooling or heating operation process, both the first heat exchange part 141 and the dehumidifying part 142 operate as an evaporator or a condenser.

In addition, the cabinet 11 is formed with an opening for discharging the air passing through the heat exchanger 14 back to the room.

In detail, an upper opening 111 is formed at an upper side of the cabinet 11, and the air passing through the heat exchanger 14 is discharged in the indoor ceiling direction. In addition, a lower opening 112 is formed below the cabinet 11, and the air passing through the heat exchanger 14 is discharged toward the indoor floor.

By the above configuration, when the cooling or heating operation is started, the blowing fan 13 is rotated so that indoor air is sucked into the indoor unit through an inlet formed between the front panel 15 and the cabinet 11. . In addition, the sucked indoor air is passed through the heat exchanger 14, the temperature is lowered or raised. Then, the air passing through the heat exchanger 14 is discharged back into the room through the upper opening 111 and the lower opening 112.

Figure 4 is a block diagram schematically showing the internal configuration and the flow of the refrigerant of the air conditioner indoor unit having the above configuration.

Referring to FIG. 4, a plurality of heat exchangers 14 are arranged inside the indoor unit 10, and the heat exchanger 14 includes a first heat exchanger 141 provided at an upper side and a second heat exchanger provided at a lower side thereof. It consists of a portion 142. In addition, an opening / closing valve 17 and an expansion valve 16 are interposed between the first heat exchanger 141 and the second heat exchanger, and the opening / closing valve 17 and the expansion valve 16 are connected in parallel.

In detail, the opening and closing valve 17 determines the opening and closing of the pipe according to a cooling or heating operation and a reheating and dehumidifying operation.

According to the configuration as described above, a case where the cooling operation is performed by way of example, the blower fan 13 is operated to suck the indoor air. In addition, the refrigerant having a low temperature and low pressure flows into the first heat exchange part 141. Here, of course, the refrigerant may be introduced into the second heat exchange unit 141.

Meanwhile, the refrigerant introduced into the first heat exchange part 141 increases in temperature while exchanging heat with suctioned indoor air. At this time, the open / close valve 17 is opened. In addition, the refrigerant passing through the first heat exchange part 141 is moved to the second heat exchange part 142 through the open / close valve 17. The temperature of the refrigerant increases while the indoor air sucked into the second heat exchange part 142 exchanges heat. The refrigerant exiting the second heat exchange part 142 flows into the compressor.

When normal cooling or heating is performed as described above, the refrigerant pressures of the first heat exchange part 141 and the second heat exchange part 142 are kept constant and the temperature is increased or decreased. The upper opening 111 and the lower opening 111 are both discharge ports.

 5 is a side cross-sectional view showing the indoor unit reheating and dehumidifying operation is performed according to the spirit of the present invention, Figure 6 is a block diagram showing the flow of the refrigerant during the reheating and dehumidification operation is performed.

5 and 6, in order for the indoor unit 10 according to the present invention to perform the reheating and dehumidifying operation, the front panel 15 is first retracted and closed. In other words, either the upper opening 111 or the lower opening 112 is the suction port, and the other is the discharge port. This is to increase the reheat dehumidification efficiency by allowing the indoor air to be sucked passes through the reheat and dehumidification process sequentially.

In detail, one of the first heat exchanger 141 and the second heat exchanger 142 constituting the heat exchanger 14 performs a reheating function (acting as a condenser), and the other is a dehumidifying function (acting as an evaporator). Each heat exchanger is arranged up and down. Therefore, when indoor air is sucked from the upper side and discharged downward or flows in the opposite direction, reheating and dehumidifying are completely performed while sequentially undergoing the reheating and dehumidifying process. Therefore, as in the conventional indoor unit, some of the intake air to perform only the dehumidification process, some of the reheating process is performed, the problem caused by mixing with each other is completely solved.

In the present embodiment, a case in which the lower opening 112 becomes the suction port and the upper opening 111 becomes the discharge port will be described in which the indoor air is sucked from the lower side and discharged to the upper side.

In detail, a method of reheating after indoor air is dehumidified during reheating and dehumidification and vice versa may be suggested. However, it is possible to cause the dehumidified air to reheat. It is advantageous in terms of corrosion protection. Therefore, when the flow is formed in the direction in which the indoor air rises, the first heat exchange part 141 becomes the reheating part A, and the second heat exchange part 142 becomes the dehumidification part B.

On the other hand, as mentioned above, the reheating and dehumidifying operation does not require much load of the compressor, as compared to the case of cooling or heating operation, it is sufficient to allow some of the refrigerant to circulate. In other words, since the reheating and dehumidifying operation is to obtain the dehumidifying effect while the indoor air maintains the room temperature, the temperature and pressure of the refrigerant flowing into the reheating unit for performing the condensation function are not required to be very high.

Therefore, the refrigerant having a pressure flows into the first heat exchange part 141 at a pressure and a temperature lower than the compressor outlet pressure and temperature during the cooling or heating operation.

On the other hand, the refrigerant introduced into the first heat exchanger 141 is lowered in temperature while exchanging heat with the sucked air. In addition, the refrigerant passing through the first heat exchange part 141 flows into the second heat exchange part 142. Here, the on-off valve 17 is closed during the reheating and dehumidifying operation, and the refrigerant passing through the first heat exchange part 141 passes through the expansion valve 16. Therefore, the refrigerant passing through the first heat exchange part 141 is introduced into the second heat exchange part 142 after the temperature and pressure drop occur. In addition, the refrigerant introduced into the second heat exchange part 142 exchanges heat with the suctioned indoor air, so that the moisture is condensed while the temperature of the suction air decreases. That is, indoor air passes through the dehumidification process while passing through the second heat exchange part 142.

In addition, the indoor air that has passed through the dehumidification process increases in temperature while passing through the first heat exchange part 141, and is discharged again into a room at a temperature close to the temperature at which it is sucked.

As described above, by allowing the indoor air to be sucked and discharged in one direction during the reheating and dehumidification process, the dehumidification and reheating are sequentially performed completely, thereby increasing the reheating and dehumidification efficiency.

7 is a system block diagram showing a reheating and dehumidifying process according to another embodiment of the present invention.

Referring to Figure 7, in the present embodiment, the entire heat exchanger is not used for reheating and dehumidification, it is characterized in that only a portion is used.

In addition, during the reheating and dehumidification process, the refrigerant passing through the reheating unit is not concentrated at one point before being introduced into the dehumidifying unit, so that pressure loss of the pipe is prevented from occurring. This is because, as described above in the prior art, when the refrigerant concentrates at one point, pressure loss of the refrigerant occurs.

In detail, the indoor unit according to the present embodiment is the same as the components of the previous embodiment in the components thereof, except that there is a difference in the flow of the refrigerant.

In more detail, the indoor unit according to the present embodiment is connected to four heat exchangers as one, and during the cooling or heating operation, the four heat exchangers are operated in the same state. In the reheating and dehumidification operation, the four heat exchangers are divided into two parts, and the upper part is divided into a reheating part and the lower part into a dehumidifying part. Therefore, at least one heat exchanger of the heat exchanger of the reheating unit and at least one heat exchanger of the heat exchanger of the dehumidifying unit perform the reheating function and the dehumidifying function, respectively.

In addition, the refrigerant flowing in the cooling or heating operation flows branched toward each heat exchanger inlet, and is discharged to discharge pipes provided in each heat exchanger to meet at the inlet side of the next component. For example, the refrigerant flowing through the expansion valve into the indoor unit is branched to each heat exchanger, flows out of each heat exchanger, and coincides with the compressor inlet. This is different from the conventional indoor unit structure in which the refrigerant passing through the reheating unit side heat exchanger is collected at one point and flows into the dehumidifying unit side heat exchanger during cooling or heating operation.

In addition, in the reheating and dehumidifying process, the number of heat exchangers performing the reheating function and the dehumidifying function of the four heat exchangers may be easily adjusted. In detail, the entire heat exchanger is used in the cooling or heating process, but only some heat exchangers may be used in the reheating and dehumidifying process.

In the present embodiment, four heat exchangers have been proposed to constitute one indoor heat exchanger, but the present invention is not limited to the number of heat exchangers presented.

On the other hand, with reference to the structure of the indoor unit presented in this embodiment in more detail, the indoor unit according to the present invention is a reheating portion (A) consisting of the first heat exchanger 241 and the second heat exchanger 242, and the third A dehumidifying part B including the heat exchanger 243 and the fourth heat exchanger 244 is included. The refrigerant discharged from the previous component, such as a compressor or expansion valve, is distributed and flows to each heat exchanger inlet. The refrigerant distributed to each heat exchanger inlet is then discharged to each heat exchanger outlet and forms a piping structure that meets at the inlet side of the next component.

In addition, a plurality of on-off valves are installed in each of the heat exchanger inlet or outlet pipes, so that the flow of the refrigerant in the heating and cooling mode and the reheat and dehumidification mode is variable.

In detail, in the heating / cooling mode, all of the on / off valves are opened to allow the refrigerant to flow toward each heat exchanger, and in the reheating and dehumidifying mode, the flow path is applied such that only one of the heat exchanger of the reheating unit and the heat exchanger of the dehumidifying unit flows. Open and close. Then, after the refrigerant passing through the reheating unit side heat exchanger passes through the expansion valve 26, a flow path flowing into the dehumidifying unit side heat exchanger is formed.

In this embodiment, the opening and closing valves 271, 272, and 273 are mounted on the inlet pipes of the third heat exchanger 243 and the fourth heat exchanger 244, and the outlet pipes of the second heat exchanger 242, respectively. The outlet of the second heat exchanger 242 and the inlet of the third heat exchanger 243 are connected by the expansion valve 26. In addition, the pipes were configured such that the refrigerant supplied from the previous components flowed separately into the first and fourth heat exchangers and the second and third heat exchangers, respectively.

With the above configuration, the refrigerant flows into each heat exchanger in the cooling and heating mode, and the refrigerant is discharged from each heat exchanger and then concentrated to the inlet side of the component.

In addition, in the reheat and dehumidification mode, the refrigerant is supplied and flows only toward the second heat exchanger 242, and the refrigerant passing through the second heat exchanger 242 passes through the expansion valve 26 and toward the third heat exchanger 243. Inflow. The refrigerant passing through the third heat exchanger 243 then flows into the inlet of the component.

Here, the configuration of the piping is not limited to the above-described embodiment, all embodiments satisfying the following conditions can be proposed. in detail,

(1) In the cooling and heating mode, the refrigerant flows through all the heat exchangers separately.

(2) In the reheating and dehumidifying mode, only a part of the reheating part heat exchanger flows through the refrigerant,

(3) In the reheating and dehumidifying mode, the refrigerant flowing into the reheating unit heat exchanger includes a pipe structure and a position of an on / off valve for allowing the refrigerant flowing into the dehumidifying unit heat exchanger via the expansion valve 26 to be included in the scope of the present embodiment.

As described above, the use of only a part of the indoor heat exchanger in the reheating and dehumidifying operation does not require the refrigerant to be compressed to high temperature and high pressure in the reheating and dehumidifying operation, and it is sufficient that not all of the refrigerant is used.

Therefore, it is possible to eliminate unnecessary compressor driving and energy loss during the reheating and dehumidifying operation by the outdoor unit system as described above.

By the air conditioner according to the present invention having the configuration as described above, the indoor air sucked during the reheating and dehumidification operation is completely subjected to the dehumidification process and then the reheating process is performed, thereby preventing dew condensation inside the fan or other structure. There is.

In addition, since the refrigerant passing through the reheating unit and the refrigerant flowing into the dehumidifying unit are not concentrated at one point, the pipe pressure drop problem does not occur, so the heat exchanger design is easy.

In addition, the heat exchanger structure of the air conditioner according to the present invention, there is an advantage that can be added to the reheat dehumidification module regardless of whether the heat exchanger is large or small diameter.

In addition, in the reheat and dehumidification operation, since the number of heat exchangers used can be properly adjusted, there is an advantage that the compression work is reduced and the overall thermal efficiency is increased.

Claims (14)

A cabinet including a plurality of openings; A heat exchanger installed inside the cabinet and separated into a reheating unit for heating the sucked air during a reheating and dehumidifying operation and a dehumidifying unit for cooling the sucked air; and A fan provided inside the cabinet and sucking air is included; In the reheating and dehumidification operation, air is sucked and discharged in one direction, and the air conditioner is sequentially passed through the dehumidifying unit and the reheating unit of the heat exchanger. The method of claim 1, A front panel is pivotally mounted on the front surface of the cabinet to allow the air inlet to be formed during the cooling or heating operation. The air conditioner is characterized in that during the cooling or heating operation, the air is sucked through the air inlet, passed through the heat exchanger, and then divided into the plurality of openings. The method of claim 1, At least one of the openings is an air inlet, and at least one of the openings is an air outlet during reheating and dehumidification operation. The method of claim 1, Air conditioner further comprises an opening and closing valve and expansion valve connected in parallel between the reheating unit and the dehumidifying unit. The method of claim 4, wherein The on-off valve is opened during the cooling or heating operation, the refrigerant passing through the reheating unit moves to the dehumidifying unit without a pressure change. The method of claim 4, wherein The on-off valve is closed during the reheating and dehumidification operation, the refrigerant passing through the reheating unit passes through the expansion valve and moves to the dehumidifying unit, characterized in that. The method of claim 1, The reheating unit and the dehumidifying unit are each formed by connecting at least two heat exchangers, In the cooling or heating operation, the entire reheating unit and the dehumidifying unit are driven under the same pressure. The air conditioner, characterized in that during the reheating and dehumidification operation only a part of the heat exchanger constituting the reheating unit and the dehumidifying unit. The method of claim 1, During the cooling or heating operation, the refrigerant flows into one end of the heat exchanger and is discharged to the other end. The method of claim 1, And a refrigerant is sucked into each of the plurality of heat exchangers constituting the reheating unit and the dehumidifying unit during the cooling or heating operation, and the refrigerant is discharged from each of the plurality of heat exchangers. A cabinet including a plurality of openings for air intake and exhaust during reheat and dehumidification operation; and A plurality of heat exchangers installed inside the cabinet; An expansion member provided between the plurality of heat exchangers to selectively pass the refrigerant according to an operation mode, An air conditioner characterized in that the number of heat exchangers driven by the heating and cooling operation or the reheating and dehumidifying operation is variable. The method of claim 10, The air inlet and discharge through the opening is passed through any one of the process of reheating and dehumidification through heat exchange with the heat exchanger and then pass through another process. The method of claim 10, And the plurality of heat exchangers are divided into a reheating unit and a dehumidifying unit, and the reheating unit and the dehumidifying unit are connected by expansion members. The method of claim 12, In the cooling or heating operation, the refrigerant is introduced into the plurality of heat exchangers, respectively, so that the entire heat exchanger is driven, and in the reheating and dehumidifying operation, the air further includes an on / off valve installed at a plurality of places such that only a part of the reheating unit and the dehumidifying unit are driven. Conditioner. The method of claim 13, During the cooling or heating operation, refrigerant flows into the plurality of heat exchangers, respectively, and all flow directly to the inlet of the next component without transferring refrigerant from one heat exchanger to another heat exchanger, In the reheating and dehumidification operation, the refrigerant moves from the reheating portion through the expansion member to the dehumidifying portion and flows toward the inlet of the next component.

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