KR100816918B1 - Air conditioner with ventilation - Google Patents

Abstract

The present invention relates to an air conditioner, and more particularly, to a combined ventilation air conditioner that can be simultaneously performed ventilation and air conditioning.

Ventilation combined air conditioner according to the present invention is a casing having an indoor heat exchanger connected to the outdoor unit therein; An electric heat exchanger provided inside the casing to selectively exchange heat between indoor air and outdoor air; An air supply / exhaust fan for allowing forced air blowing of the indoor air and the outdoor air; A heat exchange passage through which heat exchange between indoor and outdoor air sucked into the casing is performed; And a ventilation passage selectively open with the heat exchange passage and discharged immediately to the outside and the interior in the state in which heat exchange between the indoor and outdoor air is not performed.

According to the present invention, as the ventilation device and the air conditioner are integrally formed, the inconvenience of having to separately install the ventilation device and the air conditioner is eliminated, and ventilation and air conditioning of the indoor space can be easily performed. The flow path adjusting device is configured to switch the flow path inside the air conditioner, so that an optimal mode can be performed according to indoor or external conditions.

Ventilation, flow regulator

Description

Air conditioner with ventilation

1 is a perspective view showing a dual-use air conditioner according to an embodiment of the present invention.

2 is an operating state diagram under the "energy save mode" of the indoor unit according to an embodiment of the present invention.

Figure 3 is an operating state under the "quick-cooling heating mode" of the indoor unit according to an embodiment of the present invention.

Figure 4 is an operating state of the indoor unit under the "ventilating clean mode" according to an embodiment of the present invention.

5 is a perspective view showing the construction of a combined indoor air conditioner according to a second embodiment of the present invention.

Fig. 6 is an operating state diagram under the "energy save mode" of the indoor unit according to the second embodiment of the present invention.

7 is an operating state diagram under the "quick-cooling heating mode" of the indoor unit according to the second embodiment of the present invention.

8 is an operating state diagram under " ventilating clean mode " of the indoor unit according to the second embodiment of the present invention;

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

101, 201: casing 110, 210: exhaust passage

120, 220: supply air passage 121, 221: exhaust fan

122, 222: Air supply fan 130, 230: Electric heat exchanger

The present invention relates to an air conditioner, and more particularly, to a combined ventilation air conditioner that can be simultaneously performed ventilation and air conditioning.

In general, most of the day's daily life is indoors, and accordingly, interest in a pleasant indoor environment is increasing.

In order to satisfy these concerns, modern air conditioners are used to properly maintain indoor temperatures in winter or summer.

In addition, natural ventilation by opening the window for ventilation of the room or a separate ventilation device is installed separately from the air conditioner.

However, when the air conditioner and the ventilator are separately installed as described above, a separate space for installing the air conditioner and the ventilator is required, and the piping structure for installing the air conditioner and the ventilator is complicated. do.

In addition, when the air conditioner and the ventilation device are separately installed, there is a problem that the user feels uncomfortable due to the temperature difference between the air discharged from the air conditioner and the air discharged from the ventilation device.

Accordingly, there is a need for a combined ventilation and air conditioning system in which the air conditioner and the ventilation device are integrally formed and capable of appropriately operating in the required indoor conditions.

The present invention has been proposed in order to meet the above-described needs, and an object of the present invention is to propose a combined ventilation air conditioner in which a ventilation device and an air conditioner are integrally formed so that ventilation and heating and cooling of an indoor space can be simultaneously performed.

In addition, an object of the present invention is to propose a combined air conditioner for ventilation to enable optimal operation according to indoor or outdoor conditions.

Ventilation combined air conditioner according to the present invention for achieving the above object is a casing having an indoor heat exchanger connected to the outdoor unit therein; An electric heat exchanger provided inside the casing to selectively exchange heat between indoor air and outdoor air; An air supply / exhaust fan for allowing forced air blowing of the indoor air and the outdoor air; A heat exchange passage through which heat exchange between indoor and outdoor air sucked into the casing is performed; And a ventilation passage selectively open with the heat exchange passage and discharged immediately to the outside and the interior in the state in which heat exchange between the indoor and outdoor air is not performed.

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Ventilation combined air conditioner according to another aspect of the present invention is a casing having a heat exchanger connected to the outdoor unit therein; An air supply flow path provided inside the casing to flow air discharged into the room; An exhaust passage provided in the casing to allow air discharged to the outside to flow; An air supply / exhaust fan for allowing forced air blowing of the indoor air and the outdoor air; An electrothermal heat exchanger is included to selectively perform heat exchange between the air passing through the air supply passage and the air exhaust passage.

Hereinafter, with reference to the drawings will be described a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention can easily suggest other embodiments within the scope of the same idea.

1 is a perspective view showing a dual-use air conditioner according to an embodiment of the present invention.

Referring to FIG. 1, the combined air conditioner according to an embodiment of the present invention is an outdoor unit 50 installed outdoors, an indoor unit 10 installed indoors to enable ventilation and air conditioning, and the outdoor unit 50. It includes a connection pipe 40 for connecting the indoor unit 10 and the.

In detail, the outdoor unit 50 is provided with a compressor, an outdoor heat exchanger, an outdoor fan, and the like to operate the indoor air conditioning. Since the outdoor unit is the same as the conventional structure, a detailed description thereof will be omitted.

On the other hand, the indoor unit 10 is connected to the indoor space to enable the heating and cooling of the room and at the same time acts to enable the ventilation of the room.

Hereinafter, the structure of the indoor unit 10 will be described in detail.

In detail, the indoor unit 10 includes a casing 101 forming an outer shape, an exhaust passage 110 formed inside the casing 101 to allow indoor air to be exhausted to the outside, and outdoor air to be supplied to the room. It is provided in the air supply flow path 120, the heat exchange unit 130 accommodated in the casing 101 and the indoor air and the outdoor air intersect, and the exhaust and air supply flow paths 110 and 120, respectively, indoor and outdoor. A blower for sucking air and a flow path adjusting device for switching the flow path inside the casing 101 according to the operating conditions.

In more detail, the casing 101 is formed in a substantially rectangular parallelepiped shape, and an exhaust duct connection port 102 to which an exhaust duct 92 is connected to one side to allow the indoor air to be exhausted to the outside, and the outdoor air to be supplied to the interior of the casing 101. The air supply duct connection port 103 to which the air supply duct 93 is connected is formed.

In addition, a first duct connection port 105 to which the first duct 95 is connected is formed on the other side of the air supply duct connection port 103 of the casing 101, and on the other side of the exhaust duct connection port 102. The second duct connection port 104 to which the two ducts 94 are connected is formed.

In addition, the casing 101 is further provided with a preliminary connection hole 106 to which the first duct 95 and the second duct 94 can be connected.

That is, when the first and second ducts 94 and 95 cannot be connected to the first and second duct joints 104 and 105 according to the installation position of the casing 101, the first and second ducts By making the two ducts 94 and 95 connect to the preliminary connection port 106, the workability is improved.

At this time, when the first and second ducts 94 and 95 are not connected to the preliminary connection port 106, dust or the like is not introduced into the casing 101 through the preliminary connection port 106. For the sake of clarity, the preliminary connector 106 is shielded by a shield (not shown).

Here, the first duct connection port 105 and the second duct connection port 104 can communicate with the exhaust flow path 110 or the air supply flow path 120, respectively, according to the flow path switching of the flow path control device. Detailed descriptions of the first and second duct joints 104 and 105 will be made later.

On the other hand, the blower is formed in the exhaust flow path 110 and the exhaust fan 121 for forcibly suctioning the indoor air into the casing 101, and the air supply flow path 120 is formed in the outdoor air is the casing ( 101) The air supply fan 122 for forced suction into the inside is included.

In addition, the heat exchange part 130 forms a rectangular parallelepiped shape, and a cross section forms a rhombus shape when inserted into the casing 101.

That is, as the electrothermal heat exchanger 130 is inserted into the casing 101 in the shape of the rhombus, the indoor air and indoor air intersect at the electrothermal heat exchanger 130, and thus the indoor air and indoor air As they cross, heat exchange is possible.

In this case, filters 132 and 134 are coupled to the total heat exchange part 130 to purify the air passing through the total heat exchange part 130.

On the other hand, the flow path adjusting device includes a first damper 160 forming a flow path for allowing the indoor air and outdoor air to pass through the electrothermal heat exchanger 130, and the indoor air and outdoor air sucked into the electrothermal heat exchange. The second damper 170 and the indoor air sucked into the exhaust flow path 110 to form a flow path for discharging to the outside of the casing 101 immediately without passing through the portion 130, the heat exchange unit 130 A third damper 180 to be moved to the air supply flow path 120 without passing through) is included.

Further, although not shown, each of the dampers 160, 170, 180 is hinged in the casing 101, and is rotated by the damper driver to form or shield each flow path.

Here, the flow path formed by the operation of the first damper 150 may be referred to as a "heat exchange flow path" because the indoor air and outdoor air cross-exchange while passing through the electrothermal heat exchanger 130.

In addition, the flow path formed by the operation of the second damper 160 allows the indoor air and the indoor air to be immediately discharged from the casing 101 without passing through the electrothermal heat exchanger 130. It may be referred to as a "ventilation flow path".

In addition, the flow path formed by the operation of the third damper 170, the indoor air sucked into the exhaust flow path 110 does not pass through the heat exchange unit 130, and passes to the air supply flow path 120. Since it is introduced and supplied to the room again, it can be referred to as a "circulation flow path."

On the other hand, on the air supply passage 120, in order to enable the heating and cooling action of the indoor unit 10, a heat exchanger (140: indoor heat exchanger) and heat exchange with the air passing through the air supply passage 120, and clean air indoors The air supply filter 150 is provided to purify the air to be introduced.

Hereinafter, the operation of the indoor unit 10 having the above configuration will be described.

2 is a state diagram of operation of the indoor unit under the "energy save mode" according to an embodiment of the present invention.

2, the "energy save mode" according to the spirit of the present invention is performed when the ventilation of the room is required while cooling or heating.

In detail, when the indoor unit 10 is operated under an "energy save mode", the indoor unit 10 performs a cooling or heating operation. That is, the compressor operates, and the indoor heat exchanger 130 acts as a condenser or evaporator according to cooling or heating.

In addition, the first damper 160 and the third damper 180 are opened, and the second damper 170 is closed.

Accordingly, a heat exchange passage through which the indoor air and the indoor air are exchanged by the first damper 160 is formed in the casing 101, and a circulation passage is formed by the third damper 180.

In more detail, the indoor air sucked into the casing 101 by the driving of the exhaust fan 121 passes through the exhaust flow path 110 and passes through the heat exchange unit 130, and then the first duct connection port. It is discharged to the outside through the 105.

Thus, under the "energy save mode" the first duct opening 105 serves as an indoor air outlet.

Meanwhile, the outdoor air is sucked into the casing 101 through the second duct connection 104 by the flow of the air supply fan 122. In addition, the sucked air is exchanged with the indoor air while passing through the heat exchange unit 130. In addition, the air passing through the total heat exchange part 130 is purified through the air supply filter 150, and heat exchanges with the refrigerant inside the heat exchanger 140 while passing through the heat exchanger 140.

Thus, under the "energy save mode" the second duct opening 104 acts as an outdoor air inlet.

Here, when the indoor unit 10 is operated by heating, the heat exchanger 140 acts as a condenser, and the temperature rises while cold outdoor air passes through the condenser. At this time, the outdoor air is preheated by heat exchange with the warm indoor air while passing through the heat exchange unit 130, and heated to a desired temperature while passing through the heat exchanger 140, so that the indoor air of the indoor unit 10 The energy can be saved.

On the other hand, when the indoor unit 10 is operated to cool the heat exchanger 140 acts as an evaporator, the temperature is lowered while the warm outdoor air passes through the heat exchanger 140. At this time, the outdoor air is pre-cooled by heat exchange with cold indoor air while passing through the heat exchange unit 130, and cooled to a desired temperature while passing through the heat exchanger 140, so that the indoor air of the indoor unit 10 The energy can be saved.

In addition, a part of the indoor air introduced into the casing 101 during this process does not pass through the electrothermal heat exchanger 130 by opening the third damper 180 to the air supply flow path 120. Inflow is configured to pass through the heat exchanger (140). Therefore, the heating and cooling load of the indoor unit 10 is reduced, thereby further saving the energy of the indoor unit 10.

3 is an operation state diagram under the "quick-cooling heating mode" of the indoor unit according to an embodiment of the present invention.

Referring to FIG. 3, the "quick-cooling heating mode" according to an embodiment of the present invention is performed when the air conditioning is operated for the first time or when the extreme / extreme air or external air is contaminated.

In detail, when the indoor unit 10 is operated under the "quick cooling mode", the indoor unit 10 performs a cooling or heating operation. That is, the compressor operates, and the heat exchanger 140 acts as a condenser or evaporator according to cooling or heating.

In addition, the first damper 160 and the second damper 170 are closed so that ventilation or heat exchange is not performed, and only the third damper 180 is opened to perform a circulation operation in which indoor air is recycled. Therefore, only the "circulation flow path" is formed inside the casing 101.

In more detail, as the third damper 180 is opened, the indoor air sucked into the exhaust flow path 110 by the driving of the exhaust fan 121 does not pass through the heat exchange unit 130. It flows into the air supply flow path 120.

In addition, the air introduced into the air supply passage 120 passes through the heat exchanger 140 and is then sucked back into the room after heat exchange with the refrigerant inside the heat exchanger 140.

Therefore, as the indoor air moved to the air supply passage 120 passes through the heat exchanger 140 again and is discharged to the room, the indoor air can be quickly cooled or heated.

Here, in the rapid cooling mode, only one of the exhaust fan 121 or the air supply fan 122 may be driven, thereby reducing power consumption due to the fan driving.

4 is a state diagram of operation of the indoor unit under the "ventilating clean mode" according to an embodiment of the present invention.

Referring to FIG. 4, the "ventilating clean mode" according to an embodiment of the present invention is performed when air conditioning is not performed and only indoor ventilation is required (spring or autumn).

In detail, when the indoor unit 10 is operated under the "ventilating clean mode", the outdoor unit 50 and the heat exchanger 140 remain stopped.

The first damper 160 and the third damper 180 are closed, and the second damper 170 is opened. Therefore, only the "ventilating flow path" is formed in the casing 101 by opening only the second damper 170.

In more detail, the indoor air sucked into the casing 101 by the operation of the exhaust fan 121 does not pass through the heat exchange unit 130, but is discharged to the outside through the second duct connection 104. do.

Thus, under the “ventilating clean mode” the second duct opening 104 acts as an indoor air outlet.

In addition, by the operation of the air supply fan 122, the outdoor air is sucked into the casing 101 through the first duct connection 105, and is discharged into the room through the air supply duct connection 103. Thus, under the "ventilation clean mode" the first duct opening 105 serves as an outdoor air intake.

As described above, in the case of the "clean air ventilation mode," indoor air and outdoor air do not heat exchange while passing through the heat exchange unit 130, but are immediately discharged to indoors or outdoors, thereby preventing unnecessary heat exchange and improving indoor comfort. It works.

That is, in the spring or autumn, when the outdoor air has a lower temperature than the indoor air, and the outdoor air is heat-exchanged with the indoor air while passing through the heat exchange unit 130, the temperature is increased, the comfort of the air flowing into the room Since this is lowered, the indoor air to be sucked is prevented from being heat-exchanged with the indoor air to be exhausted, thereby improving indoor comfort.

In addition, in the case of the ventilation clean mode, indoor air and outdoor air do not pass through the heat exchanger 130, so that the life of the heat exchanger 130 may be extended.

5 is a perspective view showing the configuration of the indoor unit for a combined air conditioner according to a second embodiment of the present invention.

This embodiment is the same as the original embodiment in other parts, except that there is a difference in the structure and the air flow path of the heat exchanger.

Referring to FIG. 5, the indoor unit 20 of the combined-use air conditioner according to the present embodiment includes an outer casing 201 and an exhaust formed inside the casing 201 to exhaust indoor air to the outside. A flow path 210, an air supply flow path 220 through which outdoor air is supplied to the indoor air, an electric heat exchanger 230 accommodated inside the casing 201, and the indoor air and the outdoor air intersect, and the air supply and exhaust And a blower provided at each of the flow paths 210 and 220 to suck indoor and outdoor air, and a flow path adjusting device for switching the flow path inside the casing 201 according to operating conditions.

In detail, the casing 201 includes an indoor air inlet 202 through which indoor air is sucked, an indoor air outlet 205 through which the sucked indoor air is discharged to the outside, and an outdoor air inlet 204 through which outdoor air is sucked; The outdoor air outlet 203 through which the sucked outdoor air is discharged to the room is included.

And, each of the inlet is formed with a damper for adjusting the amount of air flowing. In detail, the damper includes a first damper 202a formed at the indoor air inlet 202, a second damper 205a formed at the indoor air outlet 205, and the outdoor air intake 204. The third damper 204a formed and the fourth damper 203a formed in the outdoor air outlet 203 are included.

On the other hand, the blower is formed in the exhaust flow path 210, the exhaust fan 221 for forcibly suctioning the indoor air into the casing 201, and the air supply flow path 220 is formed in the outdoor air is the casing ( 201) includes an air supply fan 222 for forced suction into the inside.

On the other hand, the heat exchange unit 230 is an enthalpy wheel (enthalpy wheel) is used to heat exchange the indoor air and the outdoor air flowing while being rotated by an external drive source.

In detail, the enthalpy wheel is configured to be rotated by a wheel drive although not shown. The enthalpy wheel is composed of an indoor air passage 232 and an outdoor air passage 234.

That is, when the enthalpy wheel is rotated while the indoor air passes through the indoor air passage 232, the indoor air passage 232 is moved to the position of the outdoor air passage 234, and the indoor air passage passes. The outdoor air passes through the portion 232 and is heat-exchanged.

In other words, the indoor air passage 232 and the outdoor air passage 234 are rotated while the enthalpy wheel is rotated, and thus the position of the outdoor air passage 234 and the indoor air passage 232. By changing the heat exchange between the indoor and outdoor air is possible.

Here, the heat exchanger 230 is configured to be detachable to the casing 201. That is, the guide portion 206 is formed in the casing 210 to guide the coupling of the heat exchanger 230, so that the heat exchanger 230 is slidingly coupled, so that the user can easily exchange the heat transfer. It is possible to attach and detach the portion 230.

On the other hand, on the air supply flow path 220 to purify the air sucked into the room and the heat exchanger 240 and heat exchange with the air passing through the air supply flow path 220 in order to enable the cooling and heating action of the indoor unit 20. Filter 250 for, and the humidity control unit 260 for controlling the humidity of the room is provided.

In addition, a noise chamber 290 is formed between the outdoor air outlet 203 and the air supply fan 222 in the air supply passage 220 to reduce noise generated in the flow of air discharged into the room. The noise chamber 290 allows the air passage cross-sectional area to be changed, thereby reducing the noise of air flow.

On the other hand, the flow path control device 230 serves to selectively communicate the air supply flow path 220 and the exhaust flow path 210, a damper may be used as the flow path control device 230.

That is, in the present embodiment, the circulation passage is formed by the passage adjusting device 230, and unlike the original embodiment, the heat exchange passage and the ventilation passage are not divided.

In detail, when air flows to the air supply passage 220 and the exhaust passage 210 while the heat exchanger 230 is rotated, since the air passing through each passage exchanges with each other, in this case, a heat exchange passage is formed. can see. On the other hand, when air flows to the air supply flow path 220 and the exhaust flow path 210 in a state where the electrothermal heat exchanger 230 is stopped, heat exchange is not performed, and thus, a ventilation flow path may be formed.

That is, in this embodiment, different flow paths are not formed, respectively, but since a single flow path may be formed as a heat exchange path or a ventilation path depending on whether the electrothermal heat exchanger 230 is rotated, the air flow path of the indoor unit 20. And the structure is simplified.

Hereinafter, the operation under each mode of the indoor unit 20 having the above configuration will be described.

6 is an operation state diagram under the "energy save mode" of the indoor unit according to the second embodiment of the present invention.

Referring to FIG. 6, when the indoor unit 20 is operated under an "energy save mode", the first to fourth dampers are opened, and the air supply passage 220 and the exhaust air flow path 230 are exhausted by the flow control device 230. The flow path 210 communicates. Then, the heat exchanger 230 is rotated.

Therefore, indoor air and outdoor air may flow into the casing 201, and a part of the air introduced into the exhaust flow path 210 may flow into the air supply flow path 220.

In more detail, the indoor air sucked into the casing 201 by the driving of the exhaust fan 221 passes through the exhaust heat passage 210 and passes through the heat exchange unit 230, and then the indoor air outlet ( It is discharged to the outside through 205).

Meanwhile, outdoor air is sucked into the casing 201 through the outdoor air inlet 204 by the flow of the air supply fan 222. In addition, the sucked air is exchanged with the indoor air while passing through the heat exchange unit 230. In addition, the air passing through the total heat exchange part 230 is purified through the air supply filter 250, and exchanges heat with the refrigerant inside the heat exchanger 240 while passing through the heat exchanger 240.

In addition, a part of the indoor air introduced into the casing 201 during this process does not pass through the heat exchange part 230 as the air supply passage 220 and the exhaust passage 210 communicate with each other. It flows into the flow path 220 and passes through the heat exchanger 240 and is discharged to the room. At this time, of course, the noise is reduced while the air passing through the heat exchanger 240 passes through the noise chamber 290.

7 is an operation state diagram under the "quick-cooling heating mode" of the indoor unit according to the second embodiment of the present invention.

Referring to FIG. 7, when the indoor unit 20 is operated under a “quick cooling mode”, the first damper 202a and the fourth damper 203a are opened, and the second damper 205a and the third damper are opened. 204a is closed. In addition, the air supply passage 220 and the exhaust passage 210 communicate with each other by the passage adjusting device 230, and the heat exchange unit 230 maintains a stopped state. Therefore, only the "circulation flow path" is formed inside the casing 201.

In detail, the indoor air sucked into the exhaust flow path 210 by the driving of the exhaust fan 221 is introduced into the air supply flow path 220 without passing through the heat exchange unit 230.

In addition, the air introduced into the air supply passage 220 passes through the heat exchanger 240 and is then sucked back into the room after heat exchange with the refrigerant inside the heat exchanger 240.

Therefore, as the indoor air moved to the air supply flow path 220 passes through the heat exchanger 240 again and is discharged to the room, the indoor air can be quickly cooled or heated.

8 is an operational state diagram under the "ventilating clean mode" of the indoor unit according to the second embodiment of the present invention.

Referring to FIG. 8, when the indoor unit 20 is operated under the “clean ventilation mode”, the outdoor unit 50, the heat exchanger 240, and the total heat exchange unit 230 remain stopped. The first to fourth dampers are opened. In addition, the air supply passage 220 and the exhaust passage 210 are blocked by the passage adjusting device 230.

In more detail, the indoor air sucked into the casing 201 by the operation of the exhaust fan 221 passes through the electrothermal heat exchanger 230 and is discharged to the outside through the indoor air outlet. At this time, even if the indoor air passes through the heat exchanger 230, the heat exchanger 230 is not rotated so that heat exchange with outdoor air is not performed.

In addition, by the operation of the air supply fan 222, outdoor air is sucked into the casing 201 through the outdoor air inlet 204, and passes through the heat exchange unit 230 and the heat exchanger 240. The air is discharged into the room through the outdoor air outlet 203.

At this time, the heat exchanger 230 and the heat exchanger 240 is maintained in a state in which the operation is stopped, the outdoor air is maintained in its original state can be introduced into the room.

According to the present invention, as the ventilation device and the air conditioner are integrally formed, the inconvenience of having to install the ventilation device and the air conditioner separately is eliminated, and the effect of easily ventilating and heating the room space can be performed. There is.

In addition, since the preliminary connection port is formed to allow the duct to be mounted regardless of the installation position of the indoor unit, the workability of the air conditioner is improved.

In addition, the flow path adjusting device is configured to switch the flow path inside the air conditioner has the effect that the optimum mode can be performed according to the indoor or external conditions.

Claims (14)

A casing having an indoor heat exchanger connected to the outdoor unit therein; An electric heat exchanger provided inside the casing to selectively exchange heat between indoor air and outdoor air; An air supply / exhaust fan for allowing forced air blowing of the indoor air and the outdoor air; A heat exchange passage through which heat exchange between indoor and outdoor air sucked into the casing is performed; And And a ventilation flow path selectively opened with the heat exchange flow path and immediately discharged to the outdoor and indoor conditions in a state in which heat exchange between indoor and outdoor air is not performed. The method of claim 1, And a flow path adjusting device for selectively opening the heat exchange path and the ventilation path. The method of claim 2, The flow path control device includes a combined air conditioner including a first damper formed in the heat exchange flow path and a second damper formed in the ventilation flow path. The method of claim 1, And a circulation passage for allowing the indoor air introduced into the casing to be re-discharged to the interior, and a damper for selectively opening the circulation passage. The method of claim 1, The heat exchanger is a combined dual ventilation air conditioner, characterized in that the enthalpy wheel to allow heat exchange between the indoor air and the indoor air as it is rotated. The method of claim 5, wherein And the heat exchange flow path is selected when the enthalpy wheel is rotated, and the ventilation flow path is selected when the enthalpy wheel is stopped. The method of claim 1, The casing may include a first ventilation duct opening through which indoor air is discharged when the heat exchange path is opened, and a second duct opening through which outdoor air is sucked. The method of claim 7, wherein The outdoor air conditioner combined with the outdoor air is sucked into the first duct opening, the indoor air is discharged to the second duct opening when opening the ventilation passage. delete delete delete A casing having a heat exchanger connected to the outdoor unit therein; An air supply flow path provided inside the casing to flow air discharged into the room; An exhaust passage provided in the casing to allow air discharged to the outside to flow; An air supply / exhaust fan for allowing forced air blowing of the indoor air and the outdoor air; And a total heat exchanger configured to selectively perform heat exchange between the air passing through the air supply passage and the exhaust passage. The method of claim 12, The heat exchanger is a combined dual ventilation air conditioner, characterized in that the enthalpy wheel to allow heat exchange between the indoor air and the indoor air as it is rotated. The method of claim 12, And a damper for selectively communicating the air supply passage and the exhaust passage.

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