KR20210073153A - Air conditioning system and controlling method thereof - Google Patents

Abstract

The present invention relates to an air conditioning system and a control method thereof. In accordance with an embodiment of the present invention, the air conditioning system can comprise: a dehumidifying unit which dehumidifies external air supplied into the indoors; a regeneration unit which regenerates a liquid dehumidifying agent in the dehumidifying unit; a water supply pipe whose part passes through the dehumidifying unit; a first connection pipe which connects the regeneration unit to the dehumidifying unit, and makes the liquid dehumidifying agent regenerated in the regeneration unit flow to the dehumidifying unit; a second connection pipe which connects the regeneration unit to the dehumidifying unit, and makes the liquid dehumidifying agent, which has absorbed moisture in the dehumidifying unit, flow to the regeneration unit; a first heat exchanger which makes the liquid dehumidifying unit in the first connection pipe exchange heat with the water in the water supply pipe; and a second heat exchanger which makes the external air passing through the regeneration unit exchange heat with the water which has exchanged heat in the first heat exchanger. The present invention aims to provide an air conditioning system and a control method thereof, which are able to supply hot water as well as provide indoor ventilation and cooling functions.

Description

Air conditioning system and its control method {AIR CONDITIONING SYSTEM AND CONTROLLING METHOD THEREOF}

The present invention relates to an air conditioning system and a control method thereof, and more particularly, to an air conditioning system capable of supplying hot water and a control method thereof.

Recently, in the field of construction industry, high-rise apartment houses with eco-friendliness and high energy performance have become a trend due to the application of high airtightness and high insulation properties and high-efficiency heating and cooling systems. In particular, as interest in a comfortable indoor air environment increases, it is also common to install a total heat exchange type mechanical individual ventilation device to secure the required ventilation amount for each household. However, at present, it is difficult to form an effective indoor air environment due to the subjective judgment of the resident and whether to drive the vehicle, concerns about an increase in electricity rates, and the user's inexperience in operating environmental devices.

In order to solve these problems, attempts are being made to apply the Dedicated Outdoor Air System (DOAS), which is being applied as a high-efficiency centrally supplied air conditioning system, to high-rise apartment buildings in North America and Europe. In addition, research for miniaturization of the air conditioning system, performance of various functions, improvement of energy efficiency, and the like are continuously attempted.

Patent Application No. KR 10-2009-0087216

SUMMARY OF THE INVENTION The present invention is to solve the problems of the prior art described above, and one aspect of the present invention is to provide an air conditioning system capable of supplying hot water while providing indoor ventilation and cooling through dehumidification and cooling of outside air and a method for controlling the same.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

An air conditioning system according to an embodiment of the present invention includes a dehumidifying unit for dehumidifying outdoor air supplied to a room; a regeneration unit regenerating the liquid desiccant in the dehumidifying unit; a water supply pipe, a portion of which passes through the dehumidifying unit; a first connection pipe connecting the regeneration unit and the dehumidifying unit and allowing the liquid type desiccant regenerated in the regeneration unit to flow to the dehumidifying unit; a second connecting pipe connecting the regenerating unit and the dehumidifying unit and flowing the liquid dehumidifying agent, which has absorbed moisture in the dehumidifying unit, to the regenerating unit; a first heat exchanger for exchanging heat between the liquid desiccant in the first connection pipe and water in the water supply pipe; and a second heat exchanger exchanging heat with the external air passing through the regeneration unit and the feed water heat-exchanged in the first heat exchanger.

In one embodiment, the dehumidifier may further include an indirect evaporative cooler for cooling the outdoor air by heat-exchanging the outdoor air dehumidified by the dehumidifying unit and the indoor exhaust discharged from the room.

In an embodiment, the evaporative cooler may exchange heat between the outdoor air and the indoor exhaust when the temperature of the outdoor air is greater than the temperature of the indoor exhaust.

In one embodiment, it may further include a cooler for cooling the liquid-type desiccant heat-exchanged in the first heat exchanger.

In one embodiment, the second heat exchanger may further include a first heat source for heating the heat-exchanged feed water.

In an embodiment, a second heat source for heating the liquid dehumidifying agent flowing from the dehumidifying unit to the regenerating unit may be further included.

In an embodiment, the second heat source may control the temperature of the liquid dehumidifier by using the temperature information of the outside air.

In an embodiment, the dehumidifier may dehumidify the outside air when the humidity of the outside air is greater than a preset reference humidity.

A control method of an air conditioning system according to an embodiment of the present invention includes measuring the temperature and humidity of the outdoor air flowing toward the room; and operating the air conditioning system in a first mode when the humidity of the outside air exceeds the reference humidity, wherein the first mode sprays the liquid desiccant toward the outside air introduced into the dehumidifying unit. dehumidifying the outside air; and exchanging the liquid-type desiccant in the first connection pipe and the water in the water supply pipe passing through the dehumidifier in the first heat exchanger.

In one embodiment, in the first mode, when the temperature of the outdoor air dehumidified by the dehumidifying unit exceeds the temperature of the indoor exhaust discharged from the room, heat exchange between the indoor exhaust and the outdoor air dehumidified by the dehumidifying unit is performed in the first mode. The method may further include cooling the outside air.

In an embodiment, when the temperature of the liquid desiccant in the second connection pipe is lower than a preset first reference temperature, the method may further include heating the liquid desiccant.

In an embodiment, the first mode may further include exchanging heat in the second heat exchanger between the outdoor air that has passed through the regeneration unit and the water that has passed through the first heat exchanger.

The features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

Prior to this, the terms or words used in the present specification and claims should not be construed as conventional and dictionary meanings, and the inventor may properly define the concept of the term to describe his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that there is.

According to the air conditioning system and the control method thereof according to the embodiments of the present invention, it is possible to perform a function of supplying hot water as well as indoor ventilation and cooling.

In addition, the air conditioning system according to embodiments of the present invention can improve the regeneration efficiency of the liquid type desiccant by controlling the temperature of the liquid type desiccant.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a schematic diagram showing an air conditioning system according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating the air conditioning system of FIG. 1 .
3 is a schematic diagram showing an air conditioning system according to an embodiment of the present invention.
4 is a flowchart illustrating a method for controlling an air conditioning system according to an embodiment of the present invention.
5 is a flowchart illustrating a heating process of the liquid desiccant of FIG. 4 .
6 is a schematic diagram showing a first mode of the air conditioning system according to an embodiment of the present invention.
7 is a schematic diagram showing a second mode of the air conditioning system according to an embodiment of the present invention.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Embodiments described herein will be described with reference to cross-sectional and/or plan views, which are ideal illustrative views of the present invention. In the drawings, thicknesses of films and regions are exaggerated for effective description of technical content. Accordingly, the regions illustrated in the drawings have a schematic nature, and the shapes of the regions illustrated in the drawings are intended to illustrate specific shapes of regions of the device and not to limit the scope of the invention. In various embodiments of the present specification, terms such as first, second, third, etc. are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. The embodiments described and illustrated herein also include complementary embodiments thereof.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” refers to the presence of one or more other components, steps, operations and/or elements in a referenced element, step, operation and/or element. or addition is not excluded.

In this specification, “connection” may mean both directly connecting the mentioned components and indirectly connecting through an intermediate medium.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

1 is a schematic diagram showing an air conditioning system according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating the air conditioning system of FIG. 1 .

1 and 2 , the air conditioning system 10 according to an embodiment of the present invention may provide indoor cooling while ventilating indoor air of a building through dehumidification and/or cooling of external air. In addition, the air conditioning system 10 may supply hot water.

The air conditioning system 10 includes a liquid dehumidifier, a heat exchange unit, an evaporative cooler 500 , a cooler 550 , a first heat source 300 , a second heat source 350 , a sensor unit 650 , and a control unit 600 . may include. The heat exchanger may include a first heat exchanger 400 and a second heat exchanger 450 . The air conditioning system 10 may further include a blower 800 , a damper unit 900 , a first pump 710 , and a second pump 720 . The air conditioning system 10 may further include a water supply pipe 110 , a first connection pipe 130 , and a second connection pipe 150 .

The blower 800 may include a first blower 810 , a second blower 820 , and a third blower 830 . The damper unit 900 may include a first damper 910 , a second damper 920 , and a third damper 930 .

The liquid type dehumidifier can dehumidify the outside air supplied to the room. The liquid dehumidifier may include a dehumidifying unit 100 and a regenerating unit 200 .

The dehumidifying unit 100 may dehumidify the outside air (hereinafter, referred to as first outside air) by spraying the liquid desiccant toward the introduced outside air. In an embodiment, a liquid desiccant may be sprayed from the upper portion of the dehumidifying unit 100 . At this time, water vapor exchange occurs between the first outdoor air introduced into the dehumidifier 100 and the liquid desiccant, and the water vapor exchange may depend on a relative magnitude between the partial pressure of water vapor and the pressure of water vapor on the surface of the liquid desiccant. That is, the lower the temperature of the liquid desiccant and the higher the concentration of the liquid desiccant, the higher the dehumidifying efficiency may be. Accordingly, the liquid type desiccant may be in a low temperature state, and the low temperature liquid desiccant may absorb moisture in the first outdoor air flowing into the dehumidifying unit 100 to dehumidify the first outdoor air. The liquid-type desiccant that has absorbed the moisture of the first outside air may be stored in the lower portion of the dehumidifying unit 100 .

The dehumidifier 100 may be driven when the humidity of the first outside air is greater than a preset reference humidity. Accordingly, when the humidity of the first outdoor air is greater than the preset reference humidity, the first outdoor air may be dehumidified.

The first connection pipe 130 may connect the regeneration unit 200 and the dehumidifying unit 100 . In an embodiment, the first connection pipe 130 may connect the lower portion of the regeneration unit 200 and the upper portion of the dehumidifying unit 100 . The first connection pipe 130 may flow the liquid desiccant regenerated by the regeneration unit 200 to the dehumidifying unit 100 .

The second connection pipe 150 may connect the regeneration unit 200 and the dehumidifying unit 100 . In an embodiment, the second connection pipe 150 may connect the upper portion of the regeneration unit 200 and the lower portion of the dehumidifying unit 100 . The second connection pipe 150 may flow a liquid type desiccant that has absorbed moisture from the outside air in the dehumidifying unit 100 . The second pump 720 may be installed on the second connection pipe 150 . Accordingly, the liquid desiccant of the dehumidifying unit 100 may flow to the regenerating unit 200 through the second connection pipe 150 .

The second heat source 350 may heat the liquid desiccant flowing from the dehumidifying unit 100 to the regenerating unit 200 . When the temperature of the liquid desiccant flowing into the regeneration unit 200 falls below a certain temperature, the regeneration efficiency of the liquid desiccant in the regeneration unit 200 may decrease. If the regeneration efficiency in the regeneration unit 200 is lowered, it may be difficult to perform a stable dehumidification cycle operation. Accordingly, the second heat source 350 may heat the liquid dehumidifying agent flowing into the regeneration unit 200 so that the temperature is higher than a predetermined temperature. The second heat source 350 may be installed on the second connection pipe 150 . The second heat source 350 may be a heating coil, but is not limited thereto.

The regeneration unit 200 may regenerate the liquid desiccant that has absorbed the moisture of the first outdoor air. In the embodiment, the concentration of the liquid desiccant that has absorbed the moisture of the first outside air may decrease as the moisture content increases. If the liquid desiccant is diluted below a certain concentration, the dehumidification efficiency may be reduced. Accordingly, the regeneration unit 200 may spray the liquid desiccant containing moisture into the outdoor air (hereinafter, referred to as second outdoor air) introduced into the regeneration unit 200 . Accordingly, moisture of the liquid type desiccant is evaporated and the concentration of the liquid type desiccant may be increased. That is, the liquid type desiccant can be regenerated. The second outdoor air may absorb moisture and heat of the liquid desiccant. Accordingly, the humidity and temperature of the second outdoor air may increase.

The liquid desiccant may be a liquid substance. In an embodiment, the liquid desiccant may be lithium chloride or lithium bromide (LiBr), but is not limited thereto.

The water supply pipe 110 may flow water supply into the room. A portion of the water supply pipe 110 may be located in the dehumidifying unit 100 . Accordingly, water may flow into the room through the dehumidifying unit 100 . When the water supply passes through the dehumidifying unit 100 , the water supply may absorb some of the heat of the liquid type desiccant. Accordingly, the temperature of the feed water may increase.

The first heat exchanger 400 may exchange heat between the liquid desiccant in the first connection pipe 130 and water in the water supply pipe 110 . The first heat exchanger 400 may be installed on the first connection pipe and the water supply pipe 110 . The liquid desiccant in the first connection pipe 130 may be a desiccant regenerated by the regeneration unit 200 . The liquid desiccant in the first connection pipe 130 may be at a high temperature. The water supplied in the water supply pipe 110 passing through the dehumidifying unit 100 may be at a low temperature. Accordingly, the water supply in the water supply pipe 110 may absorb the heat of the liquid desiccant and increase the temperature. Conversely, the temperature of the liquid desiccant in the first connection pipe 130 may decrease.

The second heat exchanger 450 may exchange heat between the second outdoor air that has passed through the regeneration unit 200 and the feed water heat-exchanged in the first heat exchanger 400 . In an embodiment, the temperature of the second outside air may be greater than the temperature of the feed water. Accordingly, the feed water may absorb the heat of the second outdoor air in the second heat exchanger 450 . Conversely, the heat of the second outdoor air may be lost to the water supply in the second heat exchanger 450 .

The first heat source 300 may heat the feed water heat-exchanged in the second heat exchanger 450 . The first heat source 300 may be installed on the water supply pipe 110 . The first heat source 300 may be located between the second heat exchanger 450 and the room. The first heat source 300 may be a heating coil, but is not limited thereto.

Water supplied in the water supply pipe 110 may be heated by absorbing heat through the dehumidifying unit 100 , the first heat exchanger 400 , the second heat exchanger 450 , and the first heat source 300 . Accordingly, the air conditioning system 10 may perform an indoor hot water supply function.

The cooler 550 may cool the liquid-type desiccant heat-exchanged in the first heat exchanger 400 . The cooler 550 may be installed on the first connection pipe 130 . The cooler 550 may be installed between the re-wetting unit and the first heat exchanger 400 . As described above, since the dehumidifying efficiency of the liquid dehumidifying agent is improved as the temperature is lowered, the cooler 550 may cool the liquid dehumidifying agent in order to improve the dehumidifying efficiency.

The evaporative cooler 500 may cool the first outdoor air by heat-exchanging the first outdoor air dehumidified by the dehumidifying unit 100 and the indoor exhaust discharged from the room. In an embodiment, the evaporative cooler 500 may sensibly cool the first outdoor air through sensible heat exchange between the indoor exhaust and the first outdoor air. For example, the evaporative cooler 500 may evaporate and cool the indoor exhaust by evaporating water sprayed on the side of the indoor indoor air, and may cool the first outdoor air through sensible heat exchange between the cooled indoor exhaust and the first outdoor air.

Alternatively, in another embodiment, the evaporative cooler 500 may have a different configuration capable of cooling the first outdoor air. Here, sensible heat may mean heat required to increase the temperature of a solid, liquid, or gas without a phase change or chemical reaction.

The evaporative cooler 500 may be driven when the temperature of the first outdoor air is greater than the temperature of the indoor exhaust. Accordingly, when the temperature of the first outdoor air is greater than the temperature of the indoor exhaust, the first outdoor air and the indoor exhaust may exchange heat.

The first blower 810 may flow the first external air into the dehumidifying unit 100 . The second blower 820 may flow the second external air into the regeneration unit 200 . The third blower 830 may flow indoor exhaust into the evaporative cooler 500 .

The first damper 910 may control the flow rate of the first outdoor air flowing into the dehumidifying unit 100 . The second damper 920 may control the flow rate of the second outdoor air flowing to the regeneration unit 200 . The third damper 930 may control the flow rate of the indoor exhaust flowing to the evaporative cooler 500 .

The first pump 710 may provide an external force to the water supply so that the water supply in the water supply pipe 110 may flow. The first pump 710 may be installed on the water supply pipe 110 . The second pump 720 may provide an external force to the liquid desiccant so that the liquid desiccant in the first connection pipe 130 flows to the dehumidifier 100 . The second pump 720 may be installed on the first connection pipe 130 . The third pump 730 may provide an external force to the liquid desiccant so that the liquid desiccant in the second connection pipe 150 flows to the regeneration unit 200 . The third pump 730 may be installed on the second connection pipe 150 .

The sensor unit 650 may measure the humidity of the first outdoor air flowing into the dehumidifying unit 100 , the temperature of the first outdoor air passing through the dehumidifying unit 100 , and the temperature of the indoor exhaust. In addition, the sensor unit 650 may measure the temperature of the feed water heat-exchanged in the second heat exchanger 450 and the temperature of the liquid desiccant in the second connection pipe 150 . Information measured by the sensor unit 650 may be transmitted to the control unit 600 .

The control unit 600 uses the information received from the sensor unit 650 , the dehumidifier 100 , the regeneration unit 200 , the cooler 550 , the first heat source 300 , the second heat source 350 , and the evaporative cooler. It is possible to control the driving of the 500 , the pump unit 700 , and the blower 800 . When the humidity of the first outside air is greater than the first temperature, the control unit 600 may include the dehumidifier 100 , the first blower 810 , the first pump 710 , the second pump 720 , and the third pump 730 . ), the cooler 550 , the regeneration unit 200 , the first heat source 300 , and the like may be driven. The controller 600 may drive the third blower 830 and the evaporative cooler 500 when the temperature of the first outdoor air passing through the dehumidifying unit 100 is greater than the temperature of the indoor exhaust.

The controller 600 may control the driving of the second heat source 350 . In an embodiment, the controller 600 may control the driving of the second heat source 350 by using the temperature information of the liquid desiccant in the second connection pipe 150 . For example, in the regeneration unit 200 , when the temperature of the liquid desiccant is lower than a predetermined temperature (hereinafter, the minimum temperature), the regeneration efficiency of the liquid type desiccant may decrease. Accordingly, the moisture evaporation efficiency of the liquid type desiccant may decrease, and thus the concentration of the liquid type desiccant may be lowered. When the concentration of the liquid dehumidifying agent falls below a certain concentration, the air conditioning system 10 may not be able to operate the dehumidifying cycle. Therefore, the temperature of the liquid desiccant supplied to the regeneration unit 200 should be at least the minimum temperature.

In the regeneration unit 200, when the temperature of the liquid dehumidifier is higher than a certain temperature (hereinafter, the maximum temperature), the airtightness of the second pump 720 , the third pump 730 , the second connection pipe 150 , etc. may be reduced. have. Accordingly, the temperature of the liquid desiccant supplied to the regeneration unit 200 should be less than or equal to the maximum temperature. In an embodiment, the minimum temperature may be about 55 degrees and the maximum temperature may be about 65 degrees. Unlike this, in another embodiment, the minimum temperature and the maximum temperature may vary depending on the type of the liquid desiccant, the regeneration efficiency of the regeneration unit 200, and the like.

In an embodiment, the controller 600 may control the second heat source 350 so that the temperature of the liquid desiccant is between the maximum temperature and the minimum temperature by using the temperature information of the liquid desiccant.

3 is a schematic diagram showing an air conditioning system according to an embodiment of the present invention. For simplicity of explanation, the description of the same configuration as that described in FIGS. 1 and 2 will be omitted or briefly described, and will be mainly described with reference to the configuration different from the configuration of FIGS. 1 and 2 and different contents.

The air conditioning system 10 includes a liquid dehumidifier, a heat exchange unit, an evaporative cooler 500 , a cooler 550 , a first heat source 300 , a second heat source 350 , a sensor unit 650 , and a control unit 600 . may include. The heat exchanger may include a first heat exchanger 400 and a second heat exchanger 450 . The air conditioning system 10 may further include a blowing unit 800 , a damper unit 900 , a first pump 710 , and a second pump 720 . The air conditioning system 10 may include a water supply pipe 110 , a first connection pipe 130 , a second connection pipe 150 , a first bypass pipe 170 , and a second bypass pipe 190 . have.

The blower 800 may include a first blower 810 , a second blower 820 , and a third blower 830 . The damper unit 900 may include a first damper 910 , a second damper 920 , and a third damper 930 .

The liquid type dehumidifier can dehumidify the outside air supplied to the room. The liquid dehumidifier may include a dehumidifying unit 100 and a regenerating unit 200 .

The first bypass may connect the first connection pipe 130 and the second connection pipe 150 . When the temperature of the liquid desiccant in the second connection pipe 150 is lower than a preset temperature, the control unit 600 transfers a portion of the liquid desiccant in the first connection pipe 130 through the first bypass pipe to the second connection pipe. (150) can be bypassed. Accordingly, the temperature of the liquid desiccant in the second connection pipe 150 may increase.

The second bypass pipe 190 may bypass the second outdoor air that has passed through the regeneration unit 200 to the outside. In an embodiment, when the temperature of the second outdoor air passing through the regeneration unit 200 is lower than the temperature of the feed water passing through the first heat exchanger 400 , the second outdoor air in the second heat exchanger 450 is the heat of the feed water. can absorb. Accordingly, the second bypass pipe 190 bypasses the second outdoor air to the outside when the temperature of the second outdoor air that has passed through the regeneration unit 200 is lower than the temperature of the water that has passed through the first heat exchanger 400 . pass so that heat exchange does not occur in the second heat exchanger 450 .

Hereinafter, a method of controlling the air conditioning system 10 according to the present invention will be described. As described above for the air conditioning system 10 according to the present invention, the overlapping matters will be omitted or simply described.

5 is a flowchart illustrating a control method of an air conditioning system according to an embodiment of the present invention. 6 is a flowchart illustrating a heating process of the liquid dehumidifying agent of FIG. 5 . 6 is a schematic diagram showing a first mode of the air conditioning system according to an embodiment of the present invention. 7 is a schematic diagram showing a second mode of the air conditioning system according to an embodiment of the present invention.

5 to 7 , the control method of the air conditioning system 10 according to an embodiment of the present invention includes the steps of measuring a first temperature and a first humidity of the outdoor air flowing toward the room (S100, hereinafter, first 1 is referred to as the measurement step); and when the first humidity exceeds the reference humidity, the air conditioning system 10 is operated in the first mode, and when the first humidity is below the reference humidity, the air conditioning system 10 is set to the second mode and driving, and the first mode is a step of dehumidifying the outside air by spraying the liquid dehumidifying agent toward the outside air introduced into the dehumidifying unit 100 (S300, hereinafter referred to as a dehumidifying step). ); and exchanging the liquid-type desiccant in the first connection pipe 130 with the water in the water supply pipe that has passed through the dehumidifying unit 100 in the first heat exchanger 400 (S400, hereinafter, first heat exchange) step) may be included.

Specifically, the control method of the air conditioning system 10 according to an embodiment of the present invention includes a first measuring step (S100), a dehumidifying step (S300), a first heat exchange step (S400), a second heat exchange step (S410), It may include a first heating step (S600), and an evaporative cooling step (S800). In addition, the control method of the air conditioning system 10 may further include a second heating step (S305), and a regeneration step (S550).

The control unit 600 may drive the first blower 810 to introduce the first outside air into the dehumidifying unit 100 .

The sensor unit 650 may measure a first temperature and a first humidity of the outside air (S100). The controller 600 may determine whether the first humidity exceeds a preset reference humidity (S200). The controller 600 may operate the air conditioning system 10 in the first mode when the first humidity exceeds the reference humidity.

The first mode is a dehumidifying step (S300), an evaporative cooling step (S800), a first heat exchange step (S400), a second heat exchange step (S410), a first heating step (S600), a second heating step (S305) and regeneration It may include a step (S550).

In the dehumidification step (S300), when the first humidity exceeds the reference humidity, the control unit 600 controls the dehumidifier 100, the regeneration unit, the first pump 710, the second pump 720, and the third pump 730. ) the second heat source 350 and the like may be driven. Accordingly, the dehumidifying unit 100 may spray the liquid dehumidifying agent toward the first outside air introduced therein. By spraying the liquid-type desiccant into the first outdoor air, the first outdoor air may be dehumidified.

In the dehumidification step (S300), the controller 600 may drive the first pump 710 when the first humidity exceeds the reference humidity. Accordingly, the water supply in the water supply pipe 110 may flow by the first pump 710 . Water may be supplied with heat from the liquid desiccant while flowing in the dehumidifying unit 100 . At this time, the temperature of the water supply may be slightly increased. For example, when the temperature of the supply water flowing into the dehumidifying unit 100 is about 18 degrees, the temperature of the water supply passing through the dehumidifying part 100 may be about 18.5 degrees, but is not limited thereto.

In the dehumidifying step ( S300 ), the controller 600 may drive the third pump 730 . Accordingly, the liquid dehumidifying agent absorbing the moisture of the first outdoor air may flow to the regeneration unit 200 . When the liquid desiccant flows into the regeneration unit 200 , the second heating step S305 and the regeneration step S550 may be performed.

In the second heating step (S305), the sensor unit 650 may measure the temperature of the liquid desiccant in the second connection pipe 150 and the temperature of the second outside air (S310).

As the temperature of the second outdoor air flowing into the regeneration unit 200 is higher, the temperature of the feed water heat-exchanged in the second heat exchanger 450 will be higher than a certain temperature even if the temperature of the liquid desiccant introduced into the regeneration unit 200 is lower. can For example, the temperature of the feed water heat-exchanged in the second heat exchanger 450 may be 45 degrees or more. Accordingly, the control unit 600 may vary the temperature of the liquid desiccant flowing into the regeneration unit 200 according to the temperature of the second outside air, thereby efficiently using power.

In an embodiment, the control unit 600 may determine whether the temperature of the second outside air is greater than the first heating temperature (S320). The controller 600 may control the second heat source 350 so that the temperature of the liquid desiccant becomes a preset high temperature value when the temperature of the second outside air is lower than the first heating temperature (S325). That is, the second heat source may heat the liquid desiccant so that the temperature of the liquid desiccant becomes a preset high temperature value. For example, the controller 600 may control the second heat source 350 so that the temperature of the liquid desiccant is greater than 60 degrees or less than or equal to 65 degrees when the temperature of the second outside air is less than 25 degrees.

In an embodiment, when the temperature of the second outdoor air is greater than the first heating temperature, the controller 600 may determine whether the temperature of the second outdoor air is greater than a preset second heating temperature ( S330 ). When the temperature of the second outside air is greater than the first heating temperature and less than the second heating temperature, the controller 600 may control the second heat source 350 so that the temperature of the liquid dehumidifier becomes a preset intermediate temperature value (S325). ). That is, the second heat source may heat the liquid desiccant so that the temperature of the liquid desiccant becomes a preset intermediate temperature value. For example, when the temperature of the second outside air is greater than 25 degrees and less than 30 degrees, the control unit 600 may control the second heat source 350 so that the temperature of the liquid desiccant is greater than 55 degrees and less than or equal to 60 degrees. .

In an embodiment, when the temperature of the second outside air is greater than the second heating temperature, the controller 600 may control the second heat source 350 so that the temperature of the liquid desiccant becomes a preset low temperature value (S340). That is, the second heat source 350 may heat the liquid desiccant so that the temperature of the liquid desiccant becomes a preset low temperature value. For example, when the temperature of the second outside air is greater than 30 degrees, the controller 600 may control the second heat source 350 so that the temperature of the liquid desiccant is 55 degrees.

Contrary to this, in another embodiment, when the temperature of the liquid desiccant in the second connection pipe 150 is lower than the preset first reference temperature, the second heat source 350 may heat the liquid desiccant. However, the controller 600 may control the second heat source 350 so that the temperature of the liquid desiccant in the second connection pipe 150 does not become greater than the second reference temperature.

In addition, when the temperature of the liquid desiccant is lower than the first reference temperature or higher than the second reference temperature, the regeneration efficiency of the liquid desiccant regenerated by the regeneration unit 200 may decrease. When the regeneration efficiency of the regeneration unit 200 is low, the dehumidification cycle operation of the air conditioning system 10 may not be possible and hot water supply may not be supplied at a stable temperature. Accordingly, the controller 600 may control the second heat source 350 such that the temperature of the liquid desiccant in the second connection pipe 150 is between the first reference temperature and the second reference temperature.

In the regeneration step ( S550 ), the controller 600 may drive the second blower 820 so that the second outside air flows into the regeneration unit 200 . The control unit 600 may spray the liquid desiccant flowing into the regeneration unit 200 toward the second outside air. In this case, the moisture of the liquid type desiccant may be evaporated to increase the concentration. In addition, the second outdoor air may absorb moisture and heat from the liquid desiccant. Accordingly, the second outdoor air that has passed through the regeneration unit 200 may be high-temperature and high-humidity air.

In the first heat exchange step ( S400 ), the controller 600 may drive the second pump 720 . Accordingly, the liquid dehumidifying agent regenerated by the regenerating unit 200 may sail through the dehumidifying unit 100 . The water supplied through the dehumidifying unit 100 and the liquid dehumidifying agent in the first connection pipe 130 may exchange heat in the first heat exchanger 400 . Through the first heat exchange step, the temperature of the liquid desiccant may be decreased, and the temperature of the feed water may be increased.

The sensor unit 650 may measure the temperature of the liquid-type desiccant heat-exchanged in the first heat exchanger 400 . When the temperature of the liquid-type desiccant heat-exchanged in the first heat exchanger 400 is higher than a preset third reference temperature, the controller 600 controls the cooler 550 so that the temperature of the liquid-type desiccant is lower than the third reference temperature. can do. Accordingly, a low-temperature liquid type desiccant may be supplied to the dehumidifying unit 100 . This is because the lower the temperature of the liquid desiccant, the higher the dehumidification efficiency of the first outside air. In an embodiment, the controller 600 may control the cooler 550 so that the temperature of the liquid desiccant is approximately 15 degrees.

The feed water heat-exchanged in the first heat exchanger 400 may flow toward the second heat exchanger 450 . In an embodiment, the feed water heat-exchanged in the first heat exchanger 400 and the second outdoor air passing through the regeneration unit 200 may be heat-exchanged in the second heat exchanger 450 ( S410 ). Accordingly, the temperature of the second outdoor air may drop, and the temperature of the water supply may increase. Alternatively, in another embodiment, when the temperature of the second outside air is lower than the temperature of the feed water that has passed through the first heat exchanger 400, the second outside air may be exhausted by bypassing the outside air without heat exchange with the feed water. .

The sensor unit 650 may measure the temperature of the feed water that has passed through the second heat exchanger 450 . The control unit 600 may determine whether the temperature of the water supplied through the second heat exchanger 450 is smaller than the temperature of the water supplied by the user (S500). When the temperature of the water supplied through the second heat exchanger 450 is lower than the temperature of the hot water input by the user, the control unit 600 may drive the first heat source 300 ( S600 ). That is, the first heat source 300 may heat the water supply. Accordingly, the water may be supplied in a state in which the temperature of the hot water input by the user has been reached. Accordingly, the air conditioning system 10 may have a hot water supply function.

The sensor unit 650 may measure the temperature of the first outdoor air dehumidified by the dehumidifying unit 100 and the temperature of the indoor exhaust. The controller 600 may determine whether the temperature of the dehumidified first outdoor air is greater than the temperature of the indoor exhaust ( S700 ). The controller 600 may drive the evaporative cooler 500 and the third blower 830 when the temperature of the first outdoor air dehumidified by the dehumidifying unit 100 is greater than the temperature of the indoor exhaust.

When the temperature of the first outdoor air dehumidified by the dehumidifying unit 100 is greater than the temperature of the indoor exhaust, the evaporative cooler 500 may heat-exchange the indoor exhaust and the first outdoor air to cool the first outdoor air (S800). The first outdoor air cooled by the evaporative cooler 500 may be supplied into the room. That is, the air conditioning system 10 may perform both an indoor ventilation function and a cooling function.

However, the controller 600 may drive only the third blower 830 when the temperature of the first outdoor air dehumidified by the dehumidifying unit 100 is equal to or less than the indoor exhaust. At this time, since the temperature of the first outdoor air is lower than the temperature of the indoor exhaust, when the first outdoor air is introduced into the room, it is possible to ventilate the room as well as cool the room. That is, the air conditioning system 10 may perform an indoor ventilation function and a cooling function.

The controller 600 may operate the air conditioning system 10 in the second mode when the first humidity is equal to or less than the reference humidity. The second mode may include an evaporative cooling step.

The sensor unit 650 may measure the temperature of the first outdoor air passing through the dehumidifying unit 100 and the temperature of the indoor exhaust. The controller 600 may drive the evaporative cooler 500 and the third blower 830 when the temperature of the first outdoor air passing through the dehumidifying unit 100 is greater than the temperature of the indoor exhaust.

The evaporative cooler 500 may exchange heat with the indoor exhaust and the first outdoor air. Accordingly, the temperature of the first outside air may drop. The first outdoor air cooled by the evaporative cooler 500 may be supplied into the room. That is, the air conditioning system 10 may perform both an indoor ventilation function and a cooling function.

Also, the controller 600 may drive the third blower 830 when the temperature of the first outdoor air dehumidified by the dehumidifying unit 100 is equal to or less than the indoor exhaust. At this time, since the temperature of the first outdoor air is lower than the temperature of the indoor exhaust, when the first outdoor air is introduced into the room, it is possible to ventilate the room as well as cool the room. That is, the air conditioning system 10 may perform an indoor ventilation function and a cooling function.

In this specification, the air conditioning system 10 performing a hot water supply function and a dehumidifying function may be referred to as a first mode. Also, the second mode may be referred to as the air conditioning system 10 not performing the hot water supply function and the dehumidification function.

Although the present invention has been described in detail through specific examples, this is for the purpose of describing the present invention in detail, and the present invention is not limited thereto, and by those of ordinary skill in the art within the technical spirit of the present invention. It is clear that the modification or improvement is possible.

All simple modifications and variations of the present invention belong to the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

10: air conditioning system 100: dehumidification unit
110: water supply pipe 130: first connection pipe
150: second connection pipe 200: regeneration unit
300: first heat source 350: second heat source
400: first heat exchanger 450: second heat exchanger
500: evaporative cooler 550: cooler
600: control unit 650: sensor unit
700: pump unit 800: blower unit

Claims (12)

a dehumidifying unit for dehumidifying the outdoor air supplied to the room;
a regeneration unit regenerating the liquid desiccant in the dehumidifying unit;
a water supply pipe, a portion of which passes through the dehumidifying unit;
a first connection pipe connecting the regeneration unit and the dehumidifying unit and allowing the liquid type desiccant regenerated in the regeneration unit to flow to the dehumidifying unit;
a second connecting pipe connecting the regenerating unit and the dehumidifying unit and flowing the liquid dehumidifying agent, which has absorbed moisture in the dehumidifying unit, to the regenerating unit;
a first heat exchanger for exchanging heat between the liquid desiccant in the first connection pipe and water in the water supply pipe; and
and a second heat exchanger exchanging heat with the external air passing through the regeneration unit and the feed water heat-exchanged in the first heat exchanger.
According to claim 1,
The air conditioning system further comprising an indirect evaporative cooler cooling the outdoor air by heat-exchanging the outdoor air dehumidified by the dehumidifying unit and the indoor exhaust discharged from the room.
3. The method of claim 2,
The evaporative cooler is an air conditioning system for exchanging heat between the outdoor air and the indoor exhaust when a temperature of the outdoor air is greater than a temperature of the indoor exhaust.
According to claim 1,
The air conditioning system further comprising a cooler for cooling the liquid desiccant heat-exchanged in the first heat exchanger.
According to claim 1,
The air conditioning system further comprising a first heat source for heating the feed water heat-exchanged in the second heat exchanger.
According to claim 1,
The air conditioning system further comprising a second heat source for heating the liquid type desiccant flowing from the dehumidifier to the regeneration unit.
7. The method of claim 6,
The second heat source is an air conditioning system for controlling the temperature of the liquid type desiccant using the temperature information of the outside air.
According to claim 1,
The dehumidifier is an air conditioning system for dehumidifying the outside air when the humidity of the outside air is greater than a preset reference humidity.
In the control method for controlling the air conditioning system according to any one of claims 1 to 8,
measuring the temperature and humidity of the outdoor air flowing toward the room; and
Comprising the step of operating the air conditioning system in a first mode when the humidity of the outside air exceeds the reference humidity,
The first mode is
dehumidifying the outside air by spraying the liquid desiccant toward the outside air introduced into the dehumidifying unit; and
and exchanging heat in the first heat exchanger between the liquid dehumidifier in the first connection pipe and the water in the water supply pipe that has passed through the dehumidifier.
10. The method of claim 9,
The first mode is
When the temperature of the outdoor air dehumidified by the dehumidifying unit exceeds the temperature of the indoor exhaust discharged from the room, cooling the outdoor air by exchanging heat with the indoor exhaust and the outdoor air dehumidified by the dehumidifying unit. How to control the system.
10. The method of claim 9,
When the temperature of the liquid-type desiccant in the second connection pipe is lower than a preset first reference temperature, the control method of the air conditioning system further comprising the step of heating the liquid-type desiccant.
10. The method of claim 9,
The first mode is
The control method of the air conditioning system further comprising the step of exchanging the external air that has passed through the regeneration unit and the feed water that has passed through the first heat exchanger in the second heat exchanger.

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