KR100907604B1 - Ceiling type air conditioner and energy saving air conditioning system - Google Patents

Abstract

The ceiling type air conditioner includes an air conditioner main body having an exhaust passage, which is a passage for exhausting indoor air to the outside, and an air supply passage, which is a passage for supplying outdoor air to the interior, and an indoor air exhausted installed on the exhaust passage and the supply passage. A waste heat recovery unit for performing heat exchange between the incoming outdoor air and a circulation unit for operatively guiding at least a portion of the indoor air sucked into the exhaust passage to the supply passage. The ceiling type air conditioner has an advantage of being easy to install and high in energy efficiency while efficiently performing ventilation.

Description

Ceiling type air conditioner and energy saving air conditioning system {CEILING EMBEDDED-TYPE AIR CONDITIONER AND ENERGY SAVING TYPE AIR CONDITIONING SYSTEM}

The present invention relates to a ceiling type air conditioner and an energy saving air conditioning system, and more particularly, to a ceiling type air conditioner and an energy saving air conditioning system which are simple to install and have high energy efficiency. will be.

In general, air conditioners are classified into an integrated type and a separate type. Integral type refers to a form in which an evaporator, a condenser, a compressor, etc. are provided in one housing, and a detachable type means that the evaporator is provided in an indoor unit and the condenser and a compressor are provided in an outdoor unit. Say the form. In addition, the separate type air conditioner can be classified into a stand type in which the indoor unit is installed on the floor of the room, a wall type in which the indoor unit is installed on the indoor wall, and a ceiling type in which the indoor unit is embedded in the ceiling. Can be.

On the other hand, when simply circulating only the indoor air repeatedly, there is a problem that the indoor air pollution degree is increased and the comfort of the room may be lowered. Recently, in order to solve such a problem, a ceiling type air conditioner which sucks external air into the indoor unit main body, cools or heats it together with the indoor air, and discharges it to the interior is disclosed. In this case, in order to recover the waste heat of the exhausted indoor air, a waste heat recovery apparatus is generally provided separately or integrally.

However, the conventional ceiling-type air conditioners are provided with a separate blower for the waste heat recovery device to introduce the outdoor air, there is a problem that the structure of the waste heat recovery device itself is complicated and the power consumed by the air conditioner itself increases. .

In addition, the conventional ceiling-type air conditioner has a problem that it is difficult to introduce the elastic outdoor air according to the indoor environment. That is, in the conventional case, the amount of air introduced into the outdoor air is determined not only by the blower for the waste heat recovery device, but also because there is no control means for adjusting the amount of circulation of the indoor air. There is a problem that it is difficult to control the air volume of the outdoor air. Accordingly, when outdoor air is supplied more than necessary, additional energy consumption may occur because additional air conditioning is required for additional air conditioning. In addition, when the outdoor air is not supplied as necessary, the ventilation is not sufficiently made, the indoor comfort may be reduced.

Accordingly, the present invention has been made to solve the above problems, one object of the present invention is to provide an air conditioning system and a ceiling-type air conditioner that can efficiently supply the outdoor air required for ventilation to the room. will be.

In addition, another object of the present invention is to provide a ceiling-type air conditioner and energy-saving air conditioning system that can be installed, the installation area is small, and the energy can be reduced by implementing the heating and cooling, ventilation and waste heat recovery in one body will be.

According to a preferred embodiment of the present invention for achieving the above object of the present invention, the ceiling type air conditioner includes an exhaust passage which is a passage for exhausting indoor air to the outside and an air supply passage which is a passage for supplying outdoor air to the interior. An air conditioner main body, a waste heat recovery unit installed on the exhaust passage and the air supply passage to allow heat exchange between the exhausted indoor air and the incoming outdoor air, and selectively operating at least a portion of the indoor air sucked into the exhaust passage And a circulation unit for guiding the flow path, and an indoor air exchanger disposed on the air supply passage to cool or heat the outdoor air introduced into the air supply passage, the indoor air guided through the circulation unit, or a mixture thereof.

The air conditioner body may be provided with an exhaust blower and an air supply blower. The exhaust blower may be installed on the exhaust passage to suck indoor air, and the air blower may be installed on the supply passage to suck outdoor air or discharge the sucked air into the room. have. The ceiling type air conditioner according to the present invention does not need to separately provide a blower for the waste heat recovery unit since the outdoor air may be sucked using the blower provided in the air conditioner main body or the indoor air may be discharged. Accordingly, the structure of the waste heat recovery unit can be simplified, and the manufacturing cost of the air conditioner can be lowered. In addition, it is possible to reduce the number of blowers of the entire air conditioner can reduce the power consumption of the entire air conditioner.

Meanwhile, a closed loop for circulating cold or hot water may be formed in the air conditioner body, and an indoor heat exchanger and an outdoor heat exchanger may be provided along the closed loop.

The air conditioner main body includes an exhaust passage and an air supply passage. One end of the exhaust passage is formed with an inlet for exhaust flow passage communicating with the room, and the other end of the exhaust passage is formed with an exhaust passage for communicating with the outside. In addition, one end of the air supply passage is formed with an inlet for the air supply passage communicating with the outside, the other end of the air supply passage is formed with an air supply passage outlet for communicating with the interior. Through the above structure, the indoor air can be exhausted to the outside along the exhaust passage, and the outdoor air can be supplied to the interior along the air supply passage.

At this time, a waste heat recovery part is provided on the exhaust passage and the air supply passage so that heat exchange is performed between the exhausted indoor air and the introduced outdoor air. The waste heat recovery unit may be a total heat exchanger or a sensible heat exchanger. The waste heat recovery unit may include a heat exchange element, and a passage through which indoor air passes and a passage through which outdoor air passes may be formed in the heat exchange element. The indoor air and outdoor air exchange sensible heat or sensible heat and latent heat in the course of passing through the respective flow paths, and thus heat exchange may be performed between them.

As described above, the ceiling type air conditioner according to the present invention is integrally formed with the air conditioner main body and the waste heat recovery unit. That is, the exhaust passage and the air supply passage are provided in the air conditioner main body so that indoor air and outdoor air can be exchanged, and heat exchange between the indoor air being sucked and the outdoor air sucked by the waste heat recovery unit are installed on the exhaust passage and the air supply passage. This can be done. Accordingly, the ceiling type air conditioner according to the present invention has the advantage that no additional space for installing a separate waste heat recovery device is required. In addition, there is no need for a duct structure for connecting an air conditioner and a separate waste heat recovery device, and the installation is simply completed by burying the ceiling air conditioner main body in the ceiling.

On the other hand, the ceiling-type air conditioner according to the present invention includes a circulation portion, it is possible to circulate a predetermined amount of indoor air sucked from the room back to the room. That is, the circulation unit is installed in communication with the exhaust passage and the air supply passage, and by adjusting the flow resistance, it is possible to adjust the air volume of the indoor air guided to the air supply passage. The circulation part includes a mixing damper that can be opened and closed, and the mixing damper is provided to be openable and openable on a boundary wall separating the exhaust passage and the air supply passage. This circulation can be selectively operated depending on the need to circulate the sucked indoor air. That is, when the circulation of the indoor air is unnecessary, it is possible to maintain a non-operating state (that is, a closed state).

The operation state of the ceiling type air conditioner according to the present invention will be described below.

Some of the indoor air sucked into the exhaust passage is supplied back to the room through the circulation portion, and the rest is discharged to the outside through the exhaust passage discharge port, and the outdoor air as much as the discharged air volume is sucked into the air supply passage and supplied to the room again. . Therefore, if the amount of circulation of indoor air through the circulation is reduced, the supply of outdoor air is increased.

That is, when a large amount of outdoor air needs to be introduced, for example, when the degree of pollution of indoor air is high, the amount of supply of outdoor air can be increased by closing the mixing damper to allow all the sucked indoor air to be discharged to the outside. Of course, since the heat exchange is performed between the indoor air to be exhausted and the outdoor air introduced through the waste heat recovery unit, it is possible to reduce energy consumption due to the discharge of the cooled indoor air.

On the contrary, when the degree of pollution of indoor air is low and the supply of outdoor air is unnecessary, the inflow of outdoor air can be reduced by completely opening the circulation unit. Accordingly, the majority of the indoor air sucked into the exhaust passage can be supplied to the room again, and in the case of general cooling operation in summer, the majority of the air that is air-conditioned through the indoor heat exchanger may be relatively low temperature indoor air. As a result, there is little need to cool the outdoor air having a relatively high temperature, thereby reducing energy consumption due to outdoor air cooling.

In addition, according to another preferred embodiment of the present invention, the energy-saving air conditioning system includes a ceiling air conditioner, a heat medium providing unit connected to the ceiling air conditioner, a first exhaust gas communicating with an exhaust passage, and having a diffuser installed at an end thereof. And a second duct portion communicating with the duct portion and the air supply passage and having a diffuser installed at an end thereof. At this time, the heat medium providing unit may be an absorption type cold and hot water group.

The ceiling type air conditioner according to the present invention is provided with an exhaust passage and an air supply passage in the air conditioner main body, and since the waste heat recovery unit is provided integrally with the air conditioner main body on one side of the flow path, an additional waste heat recovery apparatus is installed. Space is unnecessary and the effect is simple to install. In addition, since a blower provided in the air conditioner main body is used, a separate waste heat recovery device blower is unnecessary, and thus the overall structure of the air conditioner can be simplified.

In addition, the ceiling type air conditioner according to the present invention can effectively control the amount of introduction of outdoor air by adjusting the opening and closing degree of the mixing damper according to the difference between the indoor and outdoor environments, thereby increasing the ventilation efficiency.

In addition, the ceiling-type air conditioner according to the present invention has the effect that it is possible to provide an energy-saving air conditioner and air conditioning system that can save energy while improving the indoor comfort by waste heat recovery.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments. For reference, in the present description, the same numbers refer to substantially the same elements, and may be described by quoting the contents described in other drawings under the above rules, and the contents repeated or deemed apparent to those skilled in the art may be omitted.

1 is a configuration diagram for explaining an operating state of a ceiling type air conditioner according to an embodiment of the present invention, Figure 2 is a cross-sectional view for explaining a mixing damper constituting the present embodiment.

As shown in FIG. 1, the ceiling type air conditioner 100 according to an embodiment of the present invention includes an air conditioner main body 110, a waste heat recovery unit 150, and a circulation unit 170.

The air conditioner main body 110 is provided with an exhaust passage E and an air supply passage S. An exhaust passage inlet 122 is formed at one end of the exhaust passage E, and an exhaust passage outlet 124 is formed at the other end of the exhaust passage E, which communicates with the outside. In addition, an air inlet 132 is formed at one end of the air supply passage S and communicates with the outside, and an air supply passage outlet 134 is formed at the other end of the air supply passage S. Through the above structure, the indoor air can be exhausted to the outside along the exhaust passage (E), and the outdoor air can be supplied to the interior along the air supply passage (S).

In the present embodiment, the air supply passage S and the exhaust passage E may be defined by the boundary wall 190 in the air conditioner main body 110. That is, by the boundary wall 190 partitions the space, a flow path through which the indoor air and the outdoor air can flow independently of each other may be defined. Accordingly, the indoor air and the outdoor air can be moved along each flow path by the blower. However, in another embodiment of the present invention, the air supply passage and the exhaust passage may be defined using separate ducts or oil pipes.

At this time, an exhaust blower 126 for sucking and discharging the indoor air to the outside may be provided at the side of the exhaust passage inlet 122 on the exhaust passage (E). In addition, an air supply blower 136 for sucking and supplying outdoor air to the room may be provided at the air supply passage outlet 134 on the air supply passage S. As described above, in the present embodiment, only the two blowers provided in the air conditioner main body can discharge indoor air and introduce outdoor air. That is, it is not necessary to further provide a separate blower for introducing the outside air. Accordingly, the structure of the air conditioner can be simplified more, and the driving power used in the blower can be reduced. However, in some cases, an additional blower may be provided at the air inlet 132 on the air supply passage S to increase the supply of outdoor air.

On the other hand, the air supply passage (S) may be provided with an indoor heat exchanger (140). The indoor heat exchanger 140 serves to cool or heat outdoor air sucked into the air supply passage S, indoor air guided into the air supply passage S through the circulation unit 170, or mixed air thereof. . The air conditioned through the indoor heat exchanger 140 is supplied to the room through the air supply passage outlet 134 and used to cool or heat the room. In addition, the front surface of the indoor heat exchanger 140 may be provided with a filter 142, the filter 142 serves to remove foreign matters in the air.

The ceiling type air conditioner 100 according to the present embodiment may exchange outdoor air and indoor air through the air supply passage S and the exhaust passage E, that is, ventilation. At this time, the waste heat recovery unit 150 may be installed on the exhaust passage (E) and the air supply passage (S) to allow heat exchange between the exhausted indoor air and the introduced outdoor air. That is, part of the waste heat recovery unit 150 is located on the exhaust passage E, and another part of the waste heat recovery unit 150 is located on the air supply passage S, whereby the indoor air exhausted and the outdoor air introduced therein are waste heat. It may be configured to pass through the recovery unit 150.

In detail, the region I communicates with the region II through the waste heat recovery unit 150, and the region III communicates with the region IV through the waste heat recovery unit 150. Through this configuration, the indoor air sucked into the exhaust passage E may be discharged to the outside through the waste heat recovery unit 150, and the outdoor air sucked into the air supply passage S passes through the waste heat recovery unit 150. You can move indoors via IV.

Waste heat discarded to the outside through the waste heat recovery unit 150 can be recovered, thereby reducing the energy consumed by the air conditioner. That is, heat exchange is performed between the indoor air to be exhausted and the outdoor air to be sucked, so that the outdoor air can be primarily cooled (or heated), and the outdoor air that is first cooled (or heated) is the indoor heat exchanger 140. It can be cooled (or heated) secondaryly through. Accordingly, the ceiling type air conditioner 100 according to the present embodiment may save energy by recovering waste heat.

The waste heat recovery unit 150 may be a total heat exchanger or a sensible heat exchanger. The waste heat recovery unit 150 may include a heat exchange element 152, and a passage through which indoor air passes and a passage through which outdoor air passes may be formed in the heat exchange element 152, respectively. The indoor air and outdoor air exchange sensible heat or sensible heat and latent heat in the course of passing through respective flow paths, thereby recovering waste heat discarded to the outside. Can be.

As described above, the ceiling type air conditioner 100 according to the present embodiment is provided with the waste heat recovery unit 150 integrally with the air conditioner main body 110, thereby providing additional space for installing a separate waste heat recovery device. It is unnecessary and has the advantage of simple installation of the air conditioner. In addition, since there is no need for a separate blower for the waste heat recovery device, there is an advantage that the overall structure of the air conditioner can be simplified.

The circulation unit 170 selectively operates to guide at least a portion of the indoor air sucked into the exhaust passage E to the air supply passage S. That is, the circulation unit 170 is installed in communication with the exhaust flow path (E) and the air supply flow path (S), it is possible to adjust the air volume of the indoor air guided to the air supply flow path (S) by adjusting the flow path resistance. A circulation passage C may be provided to connect the exhaust passage E and the air supply passage S through the circulation unit 170. The circulation unit 170 includes a mixing damper 172 that can be opened and closed, and the mixing damper 172 is installed to be opened and closed on a boundary wall 190 that separates the exhaust passage E and the air supply passage S. In addition, a control unit (not shown) for adjusting the opening and closing degree of the mixing damper may be additionally provided.

Referring to Figure 2 will be described in detail the air volume control method by the mixing damper 172 as follows. A handle 173 for rotating the braids 178 and 179 is provided in the mixing damper 172 so as to be rotatable. The handle 173 may be manually operated or automatically operated by a motor. Here, when the handle 173 is rotated in the clockwise direction, the first braid 178 can be rotated in the clockwise direction by the interaction of the respective links 174 and 175, and the second braid 179 can be rotated in the respective links 174. , 176, 177 can be rotated counterclockwise. Accordingly, the flow path in the mixing damper 172 may be closed. As a result, the amount of air that can pass through the mixing damper 172 may be adjusted according to the rotation operation of the handle 173.

Referring to Figure 1, the operation of the ceiling-type air conditioner according to the present embodiment in detail as follows.

In the case of cooling (or heating) the room using only the air air-conditioned by the indoor heat exchanger 140, the degree of pollution of the indoor air may be increased, thereby reducing room comfort. In order to prevent this, it is necessary to supply a predetermined amount of outdoor air to the room, and in order to perform such a function, the ceiling type air conditioner 100 according to the present embodiment includes a mixing damper 172.

That is, some of the indoor air sucked into the exhaust passage (E) is supplied back to the room through the mixing damper 172, the rest is discharged to the outside through the exhaust passage outlet 124, the outdoor as much as the amount of air discharged Air is sucked into the air supply passage (S) and supplied to the room again. For example, assuming that the air volume of the indoor air sucked through the inlet 122 of the exhaust passage is 100, if the air volume of the indoor air passing through the mixing damper 172 is 70, the room passing the waste heat recovery unit 150 is 70. The air volume of the air may be 30, and thus the air volume of the outdoor air sucked may be 30.

As a result, by adjusting the opening and closing degree of the mixing damper 172, it is possible to adjust the circulation amount of the indoor air. Accordingly, if the amount of circulation of indoor air is reduced by reducing the opening degree of the mixing damper 172, the amount of supply of outdoor air is increased, thereby reducing the pollution of indoor air. In addition, the introduction of outdoor air also helps to properly maintain the indoor humidity.

Here, the opening amount of the mixing damper may vary depending on the indoor environment, and typically the opening amount may be determined based on the degree of pollution of the indoor air. The degree of pollution of indoor air may be determined based on carbon dioxide (CO2) content of indoor air. Accordingly, the air conditioner according to the present embodiment may further include a sensor for detecting the amount of carbon dioxide in the indoor air, and may automatically adjust the opening and closing degree of the mixing damper 172 according to the measured amount of carbon dioxide.

In summary, the ceiling type air conditioner 100 according to the present exemplary embodiment may perform efficient ventilation by adjusting the opening and closing degree of the mixing damper 172. For example, when a large amount of outdoor air needs to be introduced, for example, when the pollution of indoor air is high, the mixing damper 172 is closed so that all the sucked indoor air is discharged to the outside to increase the supply of outdoor air. You can.

On the contrary, when the pollution degree of the indoor air is low and the supply of outdoor air is not necessary, the mixing damper 172 may be completely opened to reduce the inflow of outdoor air. Accordingly, the majority of indoor air sucked into the exhaust passage (E) can be supplied to the room again, and in the case of general cooling operation in summer, the majority of the air that is air-conditioned through the indoor heat exchanger 140 is relatively low temperature. Can be. As a result, there is little need to cool the outdoor air having a relatively high temperature, thereby reducing energy consumption due to outdoor air cooling.

As described above, the mixing damper 172 may determine the amount of indoor air discharged and the amount of outdoor air introduced by adjusting the circulation of indoor air. Accordingly, the mixing damper 172 may not only control the comfort of the room, but also enable the efficient operation of the waste heat recovery unit 150. In detail, the mixing damper 172 may adjust the opening amount of the mixing damper 172 according to the indoor environment to adjust the air volume of the outdoor air supplied to the room. In this case, the air volume of the outdoor air introduced may be adjusted to about 0 to 100% of the air volume of the indoor air sucked into the inlet 122 by the exhaust passage. Therefore, the air conditioner according to the present embodiment has an advantage in that outdoor air of an appropriate amount of air can be introduced according to an indoor environment. In addition, the waste heat recovery unit 150 can supply only the indoor and outdoor air to the waste heat recovery unit 150 to the extent that it can efficiently handle, there is an advantage that the efficient waste heat recovery by the waste heat recovery unit 150 is possible. .

3 is a configuration diagram illustrating an energy saving air conditioning system according to another embodiment of the present invention.

As shown in FIG. 3, the energy saving air conditioning system 200 according to the present embodiment includes a ceiling type air conditioner 100, a heat medium providing unit 210, a first duct unit 220, and a second duct unit. 230.

Here, the ceiling type air conditioner may be the above-described ceiling type air conditioner. That is, the waste heat recovery unit 150 may be integrally formed, and the ceiling type air conditioner may efficiently introduce air and discharge air through the mixing damper 172. Energy-saving air conditioning system 200 according to the present embodiment is provided with the air conditioner, not only can efficiently and economically perform cooling and ventilation, but also has the advantage of small installation area and simple installation.

The heat medium providing unit 210 is connected to the indoor heat exchanger 140 of the ceiling type air conditioner 100, and generates a low temperature or high temperature refrigerant for circulation of a cooling or heating cycle. Serve on. To this end, the heat medium providing unit 210 may be an absorption cold / hot water group.

Absorption chiller is an evaporator for producing low temperature cold water using evaporation of refrigerant, an absorber for absorbing refrigerant vapor generated from evaporator using absorbent, a regenerator and regenerator for regenerating rare solution into agricultural liquid and generating high temperature refrigerant vapor. It may be configured as a condenser for condensing the generated refrigerant vapor into the cooling water. Through such a configuration, the absorption type cold and hot water heater enables cooling and heating using the liquid solubility of the refrigerant gas varies depending on temperature, pressure, and the like. The air conditioning system according to the present embodiment may use an integrated absorption cold / hot water heater in which a cooling tower is integrated among such absorption cold / hot water heaters. In the case of using the integrated absorption cold / hot water machine, not only the machine room for installing the cold / hot water machine or the freezer but also the installation area for installing the air conditioning system can be greatly reduced, and the installation becomes simple.

The first duct unit 220 communicates with the exhaust passage E provided in the ceiling type air conditioner 100, and a diffuser 222 is installed at an end thereof. This allows the indoor air to be discharged to the outside. In addition, the second duct unit 230 communicates with the air supply passage S provided in the ceiling type air conditioner 100, and the diffuser 232 is installed at an end thereof. This allows the outdoor air to be supplied indoors.

As described above, the energy-saving air conditioning system 200 according to the present embodiment has a small installation area and is simple to install, and can efficiently make external air cooling and waste heat recovery to reduce energy consumption used in the air conditioning system. It works.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can. Therefore, the spirit of the present invention should be grasped only by the claims described below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

1 is a configuration diagram illustrating an operating state of a ceiling type air conditioner according to an embodiment of the present invention.

2 is a cross-sectional view for explaining a mixing damper constituting the present embodiment.

3 is a configuration diagram illustrating an energy saving air conditioning system according to another embodiment of the present invention.

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

100: ceiling type air conditioner 110: air conditioner main body

140: indoor heat exchanger 150: waste heat recovery unit

170: circulation

Claims (14)

In the ceiling type air conditioner embedded in the ceiling, An air conditioner body having an exhaust passage that is a passage for exhausting indoor air to the outside and an air supply passage that is a passage for supplying outdoor air to the interior; A waste heat recovery unit installed on the exhaust passage and the air supply passage to allow heat exchange between the exhausted indoor air and the introduced outdoor air; And A circulation unit selectively operating to guide at least a portion of the indoor air sucked into the exhaust passage to the air supply passage; And An indoor heat exchanger disposed on the air supply passage to cool or heat the outdoor air introduced into the air supply passage, the indoor air guided through the circulation unit, or a mixture thereof; Ceiling air conditioner having a. The method of claim 1, The air conditioner main body includes an exhaust blower installed on the exhaust passage and suctioning the indoor air and discharging it to the outside, and an air blower installed on the air supply passage and sucking the outdoor air and discharging the outdoor air into the room. Ceiling air conditioner, characterized in that. The method of claim 1, The circulation unit includes a mixing damper that can be opened and closed, and the air volume of the indoor air guided to the air supply passage is adjusted according to the degree of opening and closing of the mixing damper. The method of claim 3, The ceiling air conditioner, the ceiling air conditioner further comprises a control unit for adjusting the opening and closing degree of the mixing damper. The method of claim 4, wherein The control unit is a ceiling type air conditioner, characterized in that for controlling the opening and closing degree of the mixing damper according to the pollution degree of the indoor air. delete The method of claim 5, Ceiling air conditioner, characterized in that the carbon dioxide sensor for measuring the carbon dioxide content of the indoor air at one end of the exhaust passage in which the indoor air flows. The method of claim 3, The mixing damper may include a handle rotatably provided; A first braid connected to the handle and the link so as to rotate in the same direction as the handle; And a second braid disposed adjacent to the first braid and connected to the handle and the link so as to rotate in a direction opposite to the handle. An air conditioner main body including an exhaust passage, which is a passage for exhausting indoor air to an outside, and an air supply passage, which is a passage for supplying outdoor air to the interior; Waste heat recovery unit for heat exchange between the air, a circulation unit for selectively operating to guide at least a portion of the indoor air sucked into the exhaust flow path to the air supply passage, and disposed on the air supply passage flows into the air supply passage A ceiling type air conditioner including an outdoor air, an indoor heat exchanger configured to cool or heat indoor air guided through the circulation unit or mixed air thereof; Heat medium providing unit connected to the ceiling air conditioner; A first duct unit communicating with the exhaust passage and having a diffuser installed at an end thereof; And A second duct unit communicating with the air supply passage and having a diffuser installed at an end thereof; Energy-saving air conditioning system comprising a. The method of claim 9, The heat medium providing unit is an energy-saving air conditioning system, characterized in that the absorption cold and hot water. The method of claim 9, The air conditioner main body includes an exhaust blower installed on the exhaust passage and suctioning the indoor air and discharging it to the outside, and an air blower installed on the air supply passage and sucking the outdoor air and discharging the outdoor air into the room. Energy-saving air conditioning system, characterized in that. The method of claim 9, The circulation unit includes a mixing damper that can be opened and closed, the energy saving air conditioning system characterized in that the air volume of the indoor air guided to the air supply passage is adjusted according to the opening and closing degree of the mixing damper. The method of claim 9, The ceiling air conditioner, the energy-saving air conditioning system further comprises a control unit for adjusting the opening and closing degree of the mixing damper. The method of claim 10, The control unit is an energy-saving air conditioning system, characterized in that for controlling the opening and closing degree of the mixing damper according to the pollution degree of the indoor air.

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