Ventilation system and method for controlling the same

Abstract

Disclosed is a ventilation system which comprises: a housing including a first suction port for sucking outdoor air into the housing, a second suction port for sucking indoor air into the housing, a first discharge port for discharging the outdoor air to an indoor space, and a second discharge port for discharging the indoor air to an external space; a total heat exchanger for performing heat exchange between the outdoor air and the indoor air; a first heat exchanger provided between the first suction port and the total heat exchanger; a second heat exchanger provided between the first suction port and the first heat exchanger; a compressor that supplies refrigerant to the first heat exchanger and the second heat exchanger; a four-way valve for switching the flow direction of the refrigerant; a first expansion device including a valve and provided at an inlet of the first heat exchanger to expand the refrigerant; a second expansion device including a valve and provided between the first heat exchanger and the second heat exchanger to expand the refrigerant; and at least one processor including a processing circuit.

Description

Ventilation system and its control method

[0001] The disclosed invention relates to a ventilation system for providing comfortable air to an indoor space and a method for controlling the same.

[0002] A ventilation system is a device that supplies outdoor air to a room or exchanges indoor air with outdoor air to ventilate an indoor space. Conventional ventilation systems could only control indoor temperature and humidity through heat exchange between outdoor and indoor air, generated by passing through a heat exchanger. This resulted in incomplete dehumidification of the outdoor air supplied to the room, making it difficult to maintain a comfortable indoor temperature and humidity.

[0003] If the heat exchanger only exchanges heat between outdoor and indoor air, it cannot sufficiently remove moisture contained in the outdoor air. Furthermore, in winter, when outdoor temperatures are low, the heat exchanger can freeze.

[0004] The disclosed invention provides a ventilation system and a control method thereof capable of removing moisture contained in air drawn in from outdoors and cooling or heating the air before the outdoor air passes through a heat exchanger.

[0005] Additionally, the disclosed invention provides a ventilation system and a method of controlling the same that can prevent and / or reduce freezing of a heat exchanger.

[0006] In addition, the disclosed invention provides a ventilation system and a control method thereof that can allow or block the inflow of outdoor air depending on the setting.

[0007] A ventilation system according to one embodiment may include a ventilation device and an outdoor unit. The ventilation system may include a housing including a first intake port through which outdoor air is sucked into the housing, a second intake port through which indoor air is sucked into the housing, a first outlet port through which the outdoor air is discharged into an indoor space, and a second outlet port through which the indoor air is discharged into an outdoor space; a heat exchanger for performing heat exchange between outdoor air and indoor air; a first heat exchanger provided between the first intake port and the heat exchanger; a second heat exchanger provided between the first intake port and the first heat exchanger; a compressor for supplying refrigerant to the first heat exchanger and the second heat exchanger; a four-way valve for changing the direction in which the refrigerant flows; a first expansion device including a valve provided at an inlet of the first heat exchanger to expand the refrigerant; a second expansion device including a valve provided between the first heat exchanger and the second heat exchanger to expand the refrigerant; and at least one processor including a processing circuit.

[0008] A method for controlling a ventilation system according to one embodiment includes detecting a first humidity of the outdoor air and a second humidity of the indoor air by a humidity sensor; detecting a first temperature of the outdoor air and a second temperature of the indoor air by a temperature sensor; determining an operation mode of the ventilation system based on the first humidity of the outdoor air, the second humidity of the indoor air, the first temperature of the outdoor air, and the second temperature of the indoor air by at least one processor; and controlling, based on the operation mode of the ventilation system by the at least one processor, a first expansion device including a compressor for supplying a refrigerant to the heat exchanger, a four-way valve for changing a direction in which the refrigerant flows, and a valve provided at an inlet of the first heat exchanger for expanding the refrigerant, and a second expansion device provided between the first heat exchanger and the second heat exchanger.

[0009] The disclosed ventilation system and its control method can remove moisture contained in air drawn in from the outdoors before the outdoor air passes through a heat exchanger and cool or heat the air. Accordingly, air can be supplied to an indoor space at an appropriate humidity and temperature.

[0010] The disclosed ventilation system and its control method can increase the usability of the heat exchanger even in low outdoor temperature environments by preventing and / or reducing freezing of the heat exchanger.

[0011] The disclosed ventilation system and its control method can allow or block the inflow of outdoor air depending on the settings.

[0012] FIG. 1 illustrates a ventilation system including a ventilation device according to various embodiments.

[0013] Figure 2 is a plan view from above of the interior of a ventilation device according to various embodiments.

[0014] Figure 3 illustrates an embodiment in which the arrangement of the heat exchanger in the ventilation device of Figure 2 is changed.

[0015] Figure 4 illustrates the circulation of refrigerant in a ventilation system according to various embodiments.

[0016] Figure 5 is an exploded perspective view of a ventilation device according to various embodiments.

[0017] FIG. 6 is a perspective view from below of a ventilation device with some components removed according to various embodiments.

[0018] Figure 7 is a drawing of the first inner housing of the ventilation device illustrated in Figure 5, flipped upside down.

[0019] Figure 8 is a drawing of the second inner housing of the ventilation device illustrated in Figure 5, flipped upside down.

[0020] FIG. 9 illustrates an integrated air conditioning system including a ventilation device according to various embodiments.

[0021] Fig. 10 is a control block diagram of a ventilation device according to various embodiments.

[0022] Figure 11 is a control block diagram of an integrated controller according to various embodiments.

[0023] Figure 12 illustrates the flow of air passing through a heat exchanger inside a ventilation device according to one embodiment when the outside air is circulated.

[0024] Fig. 13 illustrates an embodiment in which the arrangement of the heat exchanger is different in the ventilation device of Fig. 12.

[0025] Figure 14 illustrates the flow of air passing through the bypass path inside the ventilation device of Figure 12.

[0026] Figure 15 illustrates the flow of air passing through the bypass path inside the ventilation device of Figure 13.

[0027] Figure 16 illustrates the flow of air within a ventilation device according to one embodiment of the invention during circulation.

[0028] Fig. 17 illustrates an embodiment in which the arrangement of the heat exchanger is different in the ventilation device of Fig. 16.

[0029] Fig. 18 is a flowchart illustrating a method for controlling a ventilation system according to various embodiments.

[0030] Figure 19 is a flowchart explaining in more detail the control method of the ventilation system described in Figure 18.

[0031] FIG. 20 is a flowchart illustrating an additional embodiment of the control method of the ventilation system described in FIG. 19.

[0032] Figure 21 is a flowchart illustrating a method for controlling a ventilation system during a betting cycle.

[0033] The embodiments described in this specification and the configurations illustrated in the drawings are merely preferred examples of the disclosed invention, and there may be various modified examples that can replace the embodiments and drawings of this specification at the time of filing of this application.

[0034] The same reference numbers or symbols used in each drawing of this specification represent parts or components that perform substantially the same functions. The shapes and sizes of elements in the drawings may be exaggerated for clarity.

[0035] Throughout this specification, when a part is said to be "connected" to another part, this includes not only a direct connection but also an indirect connection, and an indirect connection includes a connection via a wireless communication network or a connection via another part.

[0036] The terminology used herein is for the purpose of describing embodiments and is not intended to limit and / or restrict the disclosed invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, the terms "comprises" or "has" and the like are intended to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0037] Terms including ordinal numbers, such as "first," "second," etc., used herein may be used to describe various components, but the components are not limited by the terms, and the terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term "and / or" includes any combination of a plurality of related listed items or any item among a plurality of related listed items.

[0038] Additionally, terms such as "~part", "~device", "~block", "~absence", and "~module" may refer to a unit that processes at least one function or operation. For example, the terms may refer to at least one piece of hardware such as an FPGA (field-programmable gate array) / ASIC (application specific integrated circuit), at least one piece of software stored in memory, or at least one process processed by a processor.

[0039] The symbols attached to each step are used to identify each step and do not indicate the order of the steps, and the steps may be performed in a different order than stated unless the context clearly indicates a specific order.

[0040] In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof.

[0041] Below, a ventilation device and a control method thereof according to various embodiments are described in detail.

[0042] Figure 1 illustrates a ventilation system including a ventilation device according to various embodiments. Figure 2 is a plan view from above of the interior of a ventilation device according to various embodiments. Figure 3 illustrates an embodiment in which the arrangement of the heat exchanger in the ventilation device of Figure 2 is changed.

[0043] Referring to FIGS. 1, 2, and 3, the ventilation system (1) may include a ventilation device (100) connected to an indoor space and an outdoor space. In addition, the ventilation system (1) may include an outdoor unit (200) that supplies refrigerant to the ventilation device (100). The ventilation device (100) and the outdoor unit (200) may be installed in a machine room (e.g., a multipurpose room of a house) that is distinct from the outdoor space and the indoor space. The locations where the ventilation device (100) and the outdoor unit (200) are installed are not limited to those exemplified.

[0044] Since the outdoor unit (200) corresponds to an outdoor unit for an air conditioner commonly known in the art, those skilled in the art can easily change or add various components necessary for implementing the outdoor unit (200). Since the disclosed ventilation system (1) can be operated using a commonly used outdoor unit (200), the ventilation device (100) can be miniaturized without including a separate compressor or other components, thereby helping to reduce production costs.

[0045] The ventilation device (100) may include a housing (101) forming an exterior. For example, the housing (101) may have a hexahedral shape. The housing (101) may include an intake passage (102) for drawing outdoor air (OA) into the indoor space and guiding it into the indoor space, and an exhaust passage (103) for guiding indoor air (RA) into the outdoor space. The intake passage (102) and the exhaust passage (103) may be partitioned from each other by a plurality of partition walls (108).

[0046] The housing (101) may include a first intake port (101a) connected to an outdoor space and provided for sucking outdoor air (OA) into the housing (101), a first discharge port (101b) connected to an indoor space and provided for sucking outdoor air (OA) into the housing (101) into the indoor space, and a first intake chamber (104) and a second intake chamber (106) forming an intake passage (102). The intake passage (102) may connect the first intake port (101a) and the first discharge port (101b).

[0047] The housing (101) may include a second intake port (101c) connected to an indoor space and provided for sucking indoor air (RA) into the housing (101), a second exhaust port (101d) connected to an outdoor space and provided for exhausting indoor air (RA) sucked into the housing (101) into the outdoor space, and a first exhaust chamber (105) and a second exhaust chamber (107) forming an exhaust path (103). The exhaust path (103) may connect the second intake port (101c) and the second exhaust port (101d).

[0048] The ventilation device (100) may include a first blower (109a) arranged on the side of the first outlet (101b) inside the second intake chamber (106) and a second blower (109b) arranged on the side of the second outlet (101d) inside the second exhaust chamber (107). The first blower (109a) may generate wind power necessary to discharge air to the first outlet (101b). The second blower (109b) may generate wind power necessary to discharge air to the second outlet (101d). That is, when the first blower (109a) operates, outdoor air is sucked into the housing (101) through the first intake port (101a), and air inside the housing (101) is discharged to the indoor space through the first outlet (101b). When the second blower (109b) operates, indoor air is sucked into the housing (101) through the second intake port (101c), and the air inside the housing (101) is discharged to the outdoor space through the second exhaust port (101d).

[0049] The ventilation device (100) may include a heat exchanger (110) provided for heat exchange between outdoor air (OA) and indoor air (RA). Air flowing through the exhaust passage (103) and air flowing through the intake passage (102) may exchange heat with each other in the heat exchanger (110). When the ventilation system (1) operates, air discharged into the indoor space through the first outlet (101b) may be referred to as 'supply air (SA)', and air discharged into the outdoor space through the second outlet (101d) may be referred to as 'exhaust air (EA)'.

[0050] The heat exchanger (110) may be made of a paper material coated with lithium chloride and may also be referred to as a 'heat exchange element'. The heat exchanger (110) may be implemented as a plate-type heat exchanger or a rotary-type heat exchanger. The heat exchanger (110) may be placed at a point where the intake passage (102) and the exhaust passage (103) intersect. That is, the heat exchanger (110) is placed on the intake passage (102) and at the same time on the exhaust passage (103).

[0051] The heat exchanger (110) can connect the first intake chamber (104) and the second intake chamber (106). The heat exchanger (110) can connect the first exhaust chamber (105) and the second exhaust chamber (107). When the ventilation system (1) is in ventilation operation, the outdoor air (OA) flowing through the intake passage (102) and the indoor air (RA) flowing through the exhaust passage (103) are heat-exchanged in the heat exchanger (110) without contact.

[0052] The ventilation device (100) may include a filter that captures foreign substances contained in outdoor air. The filter may be positioned adjacent to the heat exchanger (110). The filter (112) may be positioned between the first intake port (101a) and the heat exchanger (110). Foreign substances flowing in the outdoor air flowing in through the first intake port (101a) may be filtered by the filter, thereby preventing the heat exchanger (110) from being contaminated.

[0053] For example, the filter may be a HEPA (High Efficiency Particulate Air) filter. The HEPA filter may be composed of glass fiber. The filter may also be provided as a photocatalytic filter that induces a chemical reaction in the air using a photocatalyst. That is, the filter includes a photocatalyst and can capture various pathogens and bacteria present in the air by inducing a chemical reaction by the light energy of the photocatalyst. By promoting the chemical reaction, odor particles in the air can be decomposed, removed, or captured. However, the present invention is not limited thereto, and the filter may be provided as various types of filters capable of capturing foreign substances.

[0054] Conventional ventilation devices only include a heat exchanger that performs heat exchange between outdoor air (OA) and indoor air (RA). Conventional ventilation devices are not connected to an outdoor unit. In other words, they do not include a separate heat exchanger that receives refrigerant from the outdoor unit. Conventional ventilation devices can only supply outdoor air to indoor spaces and exhaust indoor air to outdoor spaces. Conventional ventilation devices cannot cool or heat outdoor air, nor can they perform a dehumidifying function to remove moisture contained in outdoor air.

[0055] However, the disclosed ventilation device (100) includes a heat exchanger (120, 130) that is provided to control the humidity and temperature of air flowing through an intake passage (102). The intake passage (102) may be referred to as a 'first passage'. The heat exchanger (120, 130) may be referred to as a 'dehumidification module'. The heat exchanger (120, 130) can remove moisture contained in air passing through the heat exchanger (120, 130). Since moisture contained in the air is removed while passing through the heat exchanger (120, 130), dry air can be supplied to an indoor space. In addition, the air can be cooled or heated while passing through the heat exchanger (120, 130).

[0056] Referring to FIG. 2, the heat exchanger (120, 130) may be composed of a first heat exchanger (120) and a second heat exchanger (130). The heat exchanger (120, 130) may be provided on the intake passage (102). The heat exchanger (120, 130) may be provided between the first intake port (101a) and the heat exchanger (110). The heat exchanger (120, 130) may be located within the first intake chamber (104). That is, the first heat exchanger (120) and the second heat exchanger (130) may be arranged on the upstream side of the intake passage (102) compared to the heat exchanger (110).

[0057] The second heat exchanger (130) may be arranged on the upstream side of the intake passage (102) compared to the first heat exchanger (120). In other words, the first heat exchanger (120) may be arranged on the downstream side of the intake passage (102) compared to the second heat exchanger (130).

[0058] Referring to FIG. 3, the first heat exchanger (120) may be provided between the heat exchanger (110) and the first blower (109a). The first heat exchanger (120) may be located within the second intake chamber (105). Air passing through the heat exchanger (110) may pass through the first heat exchanger (120). The second heat exchanger (130) may be provided between the first intake port (101a) and the heat exchanger (110). The second heat exchanger (130) may be located within the first intake chamber (104). Air flowing in through the first intake port (101a) may pass through the second heat exchanger (130) and then flow to the heat exchanger (110).

[0059] The number of heat exchangers provided inside the ventilation device (100) is not limited to the exemplified ones. That is, the ventilation device (100) may include two or more heat exchangers.

[0060] Outdoor air (OA) sucked in through the first intake port (101a) passes through the first intake chamber (104), the second heat exchanger (130), the first heat exchanger (120), and the heat exchanger (110) in sequence, and is then discharged into the indoor space through the first exhaust port (101b). Indoor air (RA) sucked in through the second intake port (101c) passes through the first exhaust chamber (105) and the heat exchanger (110), and is then discharged into the outdoor space through the second exhaust port (101d).

[0061] Air flowing through the intake passage (102) connected from the first intake port (101a) to the first exhaust port (101b) can be cooled and / or heated by the first heat exchanger (120) and the second heat exchanger (130). In addition, moisture contained in the air can also be removed by the first heat exchanger (120) and the second heat exchanger (130).

[0062] The ventilation device (100) may include a sterilizing device (113) for sterilizing indoor air (RA) sucked in through the second intake port (101c). The sterilizing device (113) may be placed within the first exhaust room (105). For example, the sterilizing device (113) may include at least one of a heater, an infrared lamp, or a UV-LED.

[0063] The ventilation device (100) may include various temperature sensors. For example, the ventilation device (100) may include an outdoor temperature sensor (141) that detects a first temperature of outdoor air (outdoor temperature) and an indoor temperature sensor (142) that detects a second temperature of indoor air (indoor temperature). The outdoor temperature sensor (141) may be referred to as a first temperature sensor. The indoor temperature sensor (142) may be referred to as a second temperature sensor.

[0064] The ventilation device (100) may include various humidity sensors. For example, the ventilation device (100) may include an outdoor humidity sensor (151) that detects a first humidity (outdoor humidity) of outdoor air and an indoor humidity sensor (152) that detects a second humidity (indoor humidity) of indoor air. The outdoor humidity and indoor humidity may represent relative humidity or absolute humidity. The outdoor humidity sensor (151) may be referred to as a first humidity sensor. The indoor humidity sensor (152) may be referred to as a second humidity sensor.

[0065] An outdoor temperature sensor (141) and an outdoor humidity sensor (151) may be provided on the intake passage (102). For example, the outdoor temperature sensor (141) and the outdoor humidity sensor (151) may be located in the first intake chamber (104) between the first intake port (101a) and the heat exchanger (120, 130). However, this is not limited thereto, and the outdoor temperature sensor (141) and the outdoor humidity sensor (151) may also be placed outside the housing (101).

[0066] An indoor temperature sensor (142) and an indoor humidity sensor (152) may be provided on the exhaust passage (103). The indoor temperature sensor (142) and the indoor humidity sensor (152) may be placed inside the first intake chamber (104). The indoor temperature sensor (142) and the indoor humidity sensor (152) may be placed on the upstream side of the exhaust passage (103) relative to the heat exchanger (110).

[0067] The indoor temperature sensor (142) can measure the temperature of indoor air sucked in through the second intake port (101c). The indoor humidity sensor (152) can measure the humidity of indoor air sucked in through the second intake port (101c). This is not limited to this, and the indoor temperature sensor (142) and the indoor humidity sensor (152) may also be placed outside the housing (101).

[0068] In addition, the ventilation device (100) may further include a heat exchange temperature sensor (143) provided between the first heat exchanger (120) and the total heat exchanger (110) and detecting the temperature of air passing through the first heat exchanger (120) and the second heat exchanger (130). The heat exchange temperature sensor (143) may be placed on the upstream side of the intake passage (102) rather than the total heat exchanger (110).

[0069] The ventilation device (100) may include a sterilizing device (113) for sterilizing indoor air sucked in through the second intake port (101c). The sterilizing device (113) may be placed within the second intake chamber (106). For example, the sterilizing device (113) may include at least one of a heater, an infrared lamp, or a UV-LED.

[0070] Referring to FIGS. 2 and 3, the ventilation device (100) may include various dampers for opening or closing a passage formed inside the ventilation device (100). For example, the ventilation device (100) may include a first damper (330) provided on a bypass passage (331) that bypasses a heat exchanger (110), a second damper (340) provided on a connecting passage connecting a first intake chamber (104) and a first exhaust chamber (106), and a third damper (350) provided on a first intake port (101a). The opening degrees of each of the first damper (330), the second damper (340), and the third damper (350) may be controlled by the processor (192) of the ventilation device (1).

[0071] The first damper (330) may be provided at the upper portion of the heat exchanger (110). The first damper (330) may open or close a bypass passage (331) that bypasses the heat exchanger (110) between the first intake port (101a) and the first exhaust port (101b). The processor (192) of the ventilation device (100) may control the opening degree of the first damper (330). The first damper (330) may also be provided at the lower portion of the heat exchanger (110).

[0072] A first molding (328) and a second molding (329) may be provided between one side of the heat exchanger (110) and the second internal housing (320). By virtue of the first molding (328) and the second molding (329), indoor air flowing in from the second intake port (101c) cannot flow toward the second outlet port (101d) through the upper space of the heat exchanger (110). Outdoor air flowing in from the first intake port (101a) can flow toward the first outlet port (101b) through the bypass path (331) formed in the upper space of the heat exchanger (110).

[0073] The first damper (330) may be provided between the first molding (328) and the second molding (329), and may be supported by the first molding (328) and the second molding (329). The first damper (330) is arranged perpendicular to the first molding (328) and the second molding (329), and is provided to be rotatable. The first damper (330) may be provided in a rectangular shape. The first damper (330) may rotate toward the first intake chamber (104) or toward the second intake chamber (105).

[0074] A second damper (340) may be provided between one side of the heat exchanger (110) and the inner wall of the housing (101). The second damper (340) may open or close a connecting passage connecting the first intake chamber (104) and the first exhaust chamber (106). When the second damper (340) is opened, indoor air introduced into the first exhaust chamber (106) through the second intake port (101c) may move to the first intake chamber (104).

[0075] A third damper (350) is provided in the first suction port (101a) and can open or close the first suction port (101a). When the third damper (350) is opened, the inflow of outside air into the housing (101) is permitted. When the third damper (350) is closed, the inflow of outside air into the housing (101) is blocked.

[0076] Figure 4 illustrates the circulation of refrigerant in a ventilation system according to various embodiments.

[0077] Referring to FIG. 4, the outdoor unit (200) may include a compressor (211), an accumulator (212), a four-way valve (213), and an outdoor heat exchanger (220). The compressor (211) and the outdoor heat exchanger (220) may be connected through the four-way valve (213). The four-way valve (213) may change the direction in which the refrigerant flows.

[0078] The outdoor unit (200) may include a cooling fan (220a) provided to control the temperature of the outdoor heat exchanger (220). The cooling fan (220a) may discharge air toward the outdoor heat exchanger (220) and cool the outdoor heat exchanger (220). When the outdoor heat exchanger (220) is cooled by the cooling fan (220a), the temperature of the refrigerant passing through the outdoor heat exchanger (220) may be reduced compared to when the cooling fan (220a) is not present.

[0079] The first heat exchanger (120) may be connected to the outdoor unit (200) by the first refrigerant pipe (121). The first heat exchanger (120) may be connected to the outdoor heat exchanger (220) of the outdoor unit (200) by the first refrigerant pipe (121). The second heat exchanger (130) may be connected to the first heat exchanger (120) by the second refrigerant pipe (131). The second heat exchanger (130) may be connected to the outdoor unit (200) by the third refrigerant pipe (132). The second heat exchanger (130) may be connected to the accumulator (212) of the outdoor unit (200) by the third refrigerant pipe (132).

[0080] The ventilation device (100) may include a first expansion device (160) provided in the first refrigerant pipe (121). The first expansion device (160) may selectively expand the refrigerant supplied to the first heat exchanger (120) through the first refrigerant pipe (121). The refrigerant passing through the first expansion device (160) may be in a reduced pressure state compared to before passing through the first expansion device (160).

[0081] The ventilation device (100) may include a second expansion device (170) provided in the second refrigerant pipe (131). The second expansion device (170) may selectively expand the refrigerant discharged from the first heat exchanger (120) and supplied to the second heat exchanger (130) through the second refrigerant pipe (131). The refrigerant passing through the second expansion device (170) may be in a reduced pressure state compared to before passing through the second expansion device (170). The first expansion device (160) and the second expansion device (170) may be disposed inside the housing (101). The second refrigerant pipe (131) may be disposed inside the housing (101).

[0082] The first expansion device (160) can expand high-temperature, high-pressure refrigerant into low-temperature, low-pressure refrigerant by a throttling action, and can control the flow rate of the refrigerant supplied to the first heat exchanger (120). The first expansion device (160) can reduce the pressure of the refrigerant by utilizing the throttling action of the refrigerant, in which the pressure of the refrigerant decreases without heat exchange with the outside when the refrigerant passes through a narrow passage. For example, the first expansion device (160) may include an electronic expansion valve (EEV, 161). The electronic expansion valve (161) can control the degree of expansion of the refrigerant and the flow rate of the refrigerant by adjusting the degree of opening. When the electronic expansion valve (161) is fully opened, the refrigerant can pass through the electronic expansion valve (161) without resistance, and the refrigerant may not be expanded.

[0083] The second expansion device (170) can expand high-temperature, high-pressure refrigerant into low-temperature, low-pressure refrigerant through a throttling action. For example, the second expansion device (170) can include a solenoid valve (171) and a capillary tube (172) connected in parallel with the solenoid valve (171). When the solenoid valve (171) is closed, the refrigerant can move to the capillary tube (172) and be expanded by throttling, and when the solenoid valve (171) is opened, the refrigerant can flow without resistance through the solenoid valve (171) and thus not be expanded. In order to efficiently control the flow and expansion of the refrigerant, the solenoid valve (171) can be replaced with an electronic expansion valve (EEV).

[0084] However, this is not limited thereto. For example, both the first expansion device (160) and the second expansion device (170) may include an electronic expansion valve. The first expansion device (160) may include a solenoid valve and a capillary tube connected in parallel with the solenoid valve, and the second expansion device (170) may include an electronic expansion valve. Both the first expansion device (160) and the second expansion device (170) may include a solenoid valve and a capillary tube connected in parallel with the solenoid valve. The solenoid valve connected in parallel with the capillary tube may be replaced with an electronic expansion valve.

[0085] When the inflow of outdoor air is permitted, the operation mode of the ventilation system (1) can be determined as a cooling and dehumidification mode (first mode) for drying and cooling the outdoor air, a constant temperature dehumidification mode (second mode) for drying and heating the outdoor air, a moisture recovery mode (third mode) for recovering moisture contained in indoor air, or a ventilation mode (fourth mode) for stopping the operation of the compressor. The ventilation device (100) can operate in one of the cooling and dehumidification mode (first mode), the constant temperature dehumidification mode (second mode), the moisture recovery mode (third mode), and the ventilation mode (fourth mode) based on the outdoor temperature, the indoor temperature, the outdoor humidity, and the indoor humidity.

[0086] When the inflow of outdoor air is permitted, the processor (192) of the ventilation device (100) can control the components of the ventilation device (100) so that the ventilation system (1) operates in a cooling and dehumidifying mode (first mode), a constant temperature dehumidifying mode (second mode), a moisture recovery mode (third mode), or a ventilation mode (fourth mode). The ventilation device (100) can operate by switching between the cooling and dehumidifying mode (first mode), the constant temperature dehumidifying mode (second mode), the moisture recovery mode (third mode), and the ventilation mode (fourth mode) according to changes in the outdoor temperature, indoor temperature, outdoor humidity, and indoor humidity. The cooling and dehumidifying mode (first mode) will be described. In the cooling and dehumidifying mode (first mode), the refrigerant compressed by the compressor (211) is first supplied to the outdoor heat exchanger (220) through the four-way valve (213), and then can be supplied to the first heat exchanger (120) through the first expansion device (160).

[0087] In the cooling and dehumidifying mode (first mode), the first expansion device (160) can expand the refrigerant. The second expansion device (170) can expand or not expand the refrigerant. Preferably, the second expansion device (170) can not expand the refrigerant in the cooling and dehumidifying mode (first mode) so that the refrigerant can flow smoothly. To this end, the solenoid valve (171) of the second expansion device (170) can be opened in the cooling and dehumidifying mode (first mode).

[0088] The high-temperature, high-pressure refrigerant discharged from the compressor (211) can be condensed in the outdoor heat exchanger (220) of the outdoor unit (200) through the four-way valve (213) and then introduced into the first expansion device (160). The first expansion device (160) can expand the high-temperature, high-pressure refrigerant to a low-temperature, low-pressure state so that the refrigerant can be evaporated in the first heat exchanger (120) and the second heat exchanger (130).

[0089] The refrigerant expanded in the first expansion device (160) flows into the first heat exchanger (120) and can absorb the heat of the air passing through the first heat exchanger (120) and evaporate. The refrigerant discharged from the first heat exchanger (120) and flowing into the second heat exchanger (130) can again absorb the heat of the surrounding air in the second heat exchanger (130). The first heat exchanger (120) and the second heat exchanger (130) can condense and remove moisture contained in the air passing through the first heat exchanger (120) and the second heat exchanger (130), and cool the air passing through the first heat exchanger (120) and the second heat exchanger (130). That is, the ventilation device (100) operated in the cooling and dehumidification mode (first mode) can simultaneously lower the temperature and humidity of the outdoor air sucked into the room.

[0090] The refrigerant discharged from the second heat exchanger (130) can enter the accumulator (212) through the four-way valve (213). The refrigerant can flow from the accumulator (212) into the compressor (211).

[0091] Air supplied to an indoor space by a ventilation device (100) operating in a cooling and dehumidifying mode (first mode) can have a temperature and humidity that are comfortable for the user. A ventilation device (100) operating in a cooling and dehumidifying mode (first mode) can discharge cooled and dried air into an indoor space.

[0092] The constant temperature dehumidification mode (second mode) is described. In the constant temperature dehumidification mode (second mode), the refrigerant compressed by the compressor (211) is first supplied to the outdoor heat exchanger (220) through the four-way valve (213), and then supplied to the first heat exchanger (120) through the first expansion device (160).

[0093] In the constant temperature dehumidification mode (second mode), the first expansion device (160) may not expand the refrigerant. The second expansion device (170) may expand the refrigerant. The high temperature and high pressure refrigerant discharged from the compressor (211) may be condensed in the outdoor heat exchanger (220) of the outdoor unit (200) and then introduced into the first heat exchanger (120). The first heat exchanger (120) supplied with the refrigerant may condense the refrigerant. The high temperature and high pressure refrigerant discharged from the first heat exchanger (120) may be expanded by the second expansion device (170) to become a low temperature and low pressure refrigerant. The expanded refrigerant may be introduced into the second heat exchanger (130) and may absorb heat from air passing through the second heat exchanger (130) to evaporate.

[0094] The refrigerant discharged from the second heat exchanger (130) can enter the accumulator (212) through the four-way valve (213). The refrigerant can flow from the accumulator (212) into the compressor (211).

[0095] In the constant temperature dehumidification mode (second mode), outdoor air introduced through the first intake port (101a) can sequentially pass through the second heat exchanger (130) and the first heat exchanger (120). The second heat exchanger (130) can condense and remove moisture contained in the air passing through the second heat exchanger (130), and the air passing through the second heat exchanger (130) can be cooled and dried. The first heat exchanger (120) can heat the air from which moisture has been removed by the second heat exchanger (130) by condensing the refrigerant. The air that has been cooled while passing through the second heat exchanger (130) can be heated again by the first heat exchanger (120), thereby increasing its temperature compared to when it passed through the second heat exchanger (130).

[0096] The relative humidity of the air passing through the second heat exchanger (130) and the first heat exchanger (120) may be lower than the relative humidity of the air passing only through the second heat exchanger (130). Therefore, air having a temperature and humidity that is comfortable for the user can be supplied to the indoor space. The ventilation device (100) operating in the constant temperature dehumidification mode (second mode) can discharge dry air having a temperature equal to or similar to the indoor temperature into the indoor space.

[0097] The moisture recovery mode (mode 3) is described. The direction in which the refrigerant flows in the moisture recovery mode (mode 3) may be opposite to the direction in which the refrigerant flows in the cooling dehumidification mode (mode 1) and the constant temperature dehumidification mode (mode 2).

[0098] In the moisture recovery mode (third mode), the refrigerant compressed by the compressor (211) can be supplied to the second heat exchanger (130) through the four-way valve (213). The refrigerant can sequentially pass through the second heat exchanger (130), the first heat exchanger (120), and the outdoor heat exchanger (220). In the moisture recovery mode (third mode), the high-temperature, high-pressure gaseous refrigerant compressed by the compressor (211) can be supplied to the second heat exchanger (130). The refrigerant releases heat while passing through the second heat exchanger (130), and the surrounding air can absorb the heat and be heated.

[0099] In the moisture recovery mode (third mode), the second expansion device (170) may not expand the refrigerant. When the refrigerant is expanded by the second expansion device (170), the temperature and pressure of the refrigerant may decrease. However, when the second expansion device (170) does not expand the refrigerant, the refrigerant flowing into the first heat exchanger (130) may have a relatively high pressure and high temperature. Therefore, the refrigerant may release heat again while passing through the first heat exchanger (130) and heat the surrounding air. In the moisture recovery mode (third mode), the first expansion device (160) may be controlled to expand the refrigerant or not to expand it.

[0100] Since the outdoor air flowing in through the first intake port (101a) passes through the second heat exchanger (130) and the first heat exchanger (120) in sequence, in the moisture recovery mode (third mode), the outdoor air can be first heated in the second heat exchanger (130) and then heated again in the first heat exchanger (120). The ventilation device (100) operating in the moisture recovery mode (third mode) can discharge the heated air into the indoor space.

[0101] The refrigerant discharged from the first heat exchanger (120) can be expanded by the first expansion device (160) and returned to the compressor (211) through the outdoor heat exchanger (220), the four-way valve (213) and the accumulator (212).

[0102] If freezing of the heat exchanger (110) is expected, the ventilation device (100) may operate in moisture recovery mode (third mode). For example, in winter when a low-temperature, dry outdoor environment is created, if freezing of the heat exchanger (110) occurs due to the low outdoor temperature, ventilation of indoor air through the heat exchanger (110) becomes difficult, and recovery of moisture contained in the indoor air also becomes difficult. If the ventilation device (100) operates in moisture recovery mode (third mode), freezing of the heat exchanger (110) is prevented and / or reduced, thereby enabling ventilation using the heat exchanger (110) and recovery of moisture contained in the indoor air.

[0103] In the ventilation mode (fourth mode), the refrigerant is not supplied to the first heat exchanger (120) and the second heat exchanger (130), and only heat exchange between the outdoor air and the indoor air can be performed by the total heat exchanger (110). The processor (192) can stop the compressor (211) of the outdoor unit (200) to block the inflow of the refrigerant into the ventilation device (100), control the expansion device to block the inflow of the refrigerant into the first heat exchanger (120) and the second heat exchanger (130), or turn off the outdoor unit (200) to operate the ventilation device (100) in the ventilation mode (fourth mode). Even in the ventilation mode, moisture contained in the indoor air can be recovered.

[0104] When the inflow of outdoor air is blocked, the operating mode of the ventilation system (1) can be determined as a cooling and dehumidification mode for drying and cooling indoor air, a constant temperature dehumidification mode for drying and heating indoor air, a heating mode for heating indoor air, or a blowing mode for circulating indoor air. The ventilation device (100) can operate in one of the cooling and dehumidification mode, the constant temperature dehumidification mode, the heating mode, and the blowing mode based on indoor humidity and indoor temperature. The third damper (350) is closed to block the inflow of outdoor air. In addition, the first blower (109a) operates, and the second blower (109b) is stopped.

[0105] When the inflow of outdoor air is blocked, the refrigerant flow in the cooling / dehumidification mode and the constant temperature / dehumidification mode is the same as described above. In the heating mode, the refrigerant flow is the same as in the moisture recovery mode described above. In the blowing mode, the compressor stops operating.

[0106] Fig. 5 is an exploded perspective view of a ventilation device according to various embodiments. Fig. 6 is a perspective view of a ventilation device according to various embodiments, with some components removed, as viewed from below.

[0107] Referring to FIG. 5, the ventilation device (100) may include a drain tray (125) that collects condensate generated in the heat exchanger (120, 130). The drain tray (125) may be placed on the lower side of the heat exchanger (120, 130) in the vertical direction (Z).

[0108] The housing (101) may include a first inner housing (310) and a second inner housing (320). The second inner housing (320) may be coupled to the first inner housing (310) in a vertical direction (Z). The inner housings (310, 320) may be formed of an insulating material. For example, the inner housings (310, 320) may be formed of an EPS insulating material such as Styrofoam. However, the present invention is not limited thereto, and the inner housings (310, 320) may be formed of various insulating materials so that the temperature of the air flowing through the intake passage (102) and the exhaust passage (103) can be maintained at a constant temperature.

[0109] The ventilation device (100) may include covers (410, 420) that form the outer appearance of the housing (101) and are provided to cover the inner housing (310, 320). The covers (410, 420) may include a first cover (410) that is arranged at the bottom in the vertical direction (Z), and a second cover (420) that is arranged at the top of the first cover (410) and is coupled with the first cover (410). The first cover (410) may form the lower outer appearance of the ventilation device (100), and the second cover (420) may form the upper outer appearance of the ventilation device (100). The covers (410, 420) may cover the inner housing (310, 320) to protect the inner housing (310, 320) from the outside. For example, the covers (410, 420) may be made of an injection-molded material such as plastic.

[0110] The first inner housing (310) can be inserted into the first cover (410), and the second inner housing (320) can be inserted into the second cover (420). From the bottom to the top of the ventilation device (100), the first cover (410), the first inner housing (310), the second inner housing (320), and the second cover (420) can be sequentially arranged.

[0111] Components of the ventilation device (100), such as a heat exchanger (110), a blower (109a, 109b), a heat exchanger (120, 130), and a drain tray (125), can be arranged to be supported by the first inner housing (310) and the second inner housing (320).

[0112] A first hole (315) may be provided in the first inner housing (310). The heat exchanger (110) and the drain tray (125) may be provided to be detachable from the ventilation device (100) through the first hole (315) of the first inner housing (310). The second inner housing (320) may include a second hole (325) provided to correspond to the first hole (513) of the first inner housing (310).

[0113] The first cover (410) may include a body portion (411) having a square frame shape, a surface portion (412) that is detachably connected to the body portion (411) and formed in a plate shape, and a lower cover portion (413) that is formed to cover the surface portion (412) from the bottom. The surface portion (412) of the first cover (410) may include a plate body (412a), a first surface (412b) of the plate body (412a), and a second surface disposed on the opposite side of the first surface (412b).

[0114] The surface (412) of the first cover (410) may include a third hole (412d) that is provided to correspond to the first hole (315) of the first inner housing (310). The third hole (412d) may be formed on the plate body (412a). Since the third hole (412d) is provided to correspond to the first hole (315), it may be provided asymmetrically on the plate body (412a) with one of the major axis (L) and minor axis (S) of the housing (101) as the center.

[0115] The surface (412) of the first cover (410) can be joined to the body (411) so that the first surface (412b) faces downward. The first hole (315) and the third hole (412d) can be provided in the same shape and can be overlapped in the vertical direction (Z).

[0116] Referring to Fig. 6, when the lower cover part (413) is separated from the first cover (410), the heat exchanger (110) and the drain tray (125) can be exposed to the lower side of the ventilation device (100). Therefore, the user can easily separate the heat exchanger (110) and the drain tray (125) from the ventilation device (100) as needed.

[0117] Figure 7 is a drawing of the first inner housing of the ventilation device illustrated in Figure 5, flipped upside down.

[0118] Referring to FIGS. 5 and 7, the first inner housing (310) may include a first intake forming portion (311) forming a part of the first intake port (101a), a first exhaust forming portion (312) forming a part of the first exhaust port (101b), a second intake forming portion (313) forming a part of the second intake port (101c), and a second exhaust forming portion (314) forming a part of the second exhaust port (101d). The first exhaust forming portion (312) and the second exhaust forming portion (314) may be arranged to be symmetrical with respect to the long axis (L) of the ventilation device (100). The first intake forming portion (311) and the second intake forming portion (313) may also be arranged to be symmetrical with respect to the long axis (L) of the ventilation device (100).

[0119] The first hole (315) through which the heat exchanger (110) and the drain tray (125) are withdrawn can be divided into a first region (315a) through which the heat exchanger (110) is withdrawn and a second region (315b) through which the drain tray (125) is withdrawn. The first region (315a) and the second region (315b) of the first hole (315) are shown as being connected to each other, but are not limited thereto, and the first region (315a) and the second region (315b) may be separated from each other.

[0120] The heat exchanger (110) may have a hexahedral shape. The heat exchanger (110) is provided to have a square cross-section, and the first area (315a) of the first hole (315) may be provided in a rectangular shape. The heat exchanger (110) may be exposed to the outside through the first area (315a) of the first hole (315).

[0121] The second region (315b) of the first hole (315) may be formed in a shape corresponding to the shape of the drain tray (125). For example, the second region (315b) may be formed in a polygonal shape, but is not limited thereto and may have various shapes.

[0122] Figure 8 is a drawing of the second inner housing of the ventilation device illustrated in Figure 5, flipped upside down.

[0123] Referring to FIG. 8, the second inner housing (320) may include a first intake forming portion (321) forming a part of the first intake port (101a), a first outlet forming portion (322) forming a part of the first outlet port (101b), a second intake forming portion (323) forming a part of the second intake port (101c), and a second outlet forming portion (324) forming a part of the second outlet port (101d). The first outlet forming portion (322) and the second outlet forming portion (324) may be provided to be symmetrical to each other. The first intake forming portion (321) and the second intake forming portion (323) may also be provided to be symmetrical to each other.

[0124] A first intake port (101a), a first discharge port (101b), a second intake port (101c), and a second discharge port (101d) can be formed by assembling the first inner housing (310) and the second inner housing (320) in the vertical direction (Z). When one side (316) of the first inner housing (310) and the other side (326) of the second inner housing (320) are arranged parallel, the first hole (315) of the first inner housing (310) and the second hole (325) of the second inner housing (320) also become parallel.

[0125] If the side where the first suction port (101a) and the second discharge port (101d) are arranged in the forward / backward direction (X) is referred to as one side of the housing (101), and the side where the second suction port (101c) and the first discharge port (101b) are arranged is referred to as the other side of the housing (101), the heat exchanger (120, 130) can be arranged adjacent to one side of the housing (101).

[0126] The first intake chamber (104), the second intake chamber (106), the first exhaust chamber (105), and the second exhaust chamber (107) can be partitioned by partition walls (108) formed by the first inner housing (310) and the second inner housing (320). In addition, the partition walls (108) can serve to support the heat exchanger (110) and the heat exchangers (120, 130).

[0127] The upper surface of the heat exchanger (110) may be positioned to be spaced apart from the other surface (326) of the second internal housing (320). The vertical distance between the upper surface of the heat exchanger (110) and the other surface (326) of the second internal housing (320) may vary depending on the design. The size of the space provided between the upper surface of the heat exchanger (110) and the other surface (326) of the second internal housing (320) may also vary depending on the design.

[0128] A first molding (328) and a second molding (329) may be provided between the upper surface of the heat exchanger (110) and the other surface (326) of the second internal housing (320). Due to the first molding (328) and the second molding (329), indoor air introduced from the second intake port (101c) cannot flow toward the second outlet port (101d) through the upper space of the heat exchanger (110). However, outdoor air introduced from the first intake port (101a) can flow toward the first outlet port (101b) through the upper space of the heat exchanger (110).

[0129] A first damper (330) may be provided in the second inner housing (320). When the first inner housing (310) and the second inner housing (320) are combined, the first damper (330) may be positioned at the upper portion of the heat exchanger (110). The first damper (330) may open or close the bypass path (331) formed between the first intake port (101a) and the first exhaust port (101b).

[0130] In Fig. 8, the first damper (330) is illustrated as being provided at the upper portion of the heat exchanger (110), but is not limited thereto. The first damper (330) may also be provided at the lower portion of the heat exchanger (110).

[0131] When the first damper (330) is opened, outdoor air sucked from the first intake port (101a) can move to the first exhaust port (101b) through the bypass passage (331) formed between the upper surface of the heat exchanger (110) and the second internal housing (320). In this case, the outdoor air may not pass through the heat exchanger (110) due to the difference in flow rate.

[0132] The first damper (330) may be provided between the first molding (328) and the second molding (329), and may be supported by the first molding (328) and the second molding (329). The first damper (330) is arranged perpendicular to the first molding (328) and the second molding (329), and is provided to be rotatable. The first damper (330) may be provided in a rectangular shape. The first damper (330) may rotate toward the first intake chamber (104) or toward the first exhaust chamber (105).

[0133] When the ventilation device (100) operates in the cooling and dehumidifying mode (first mode), the ventilation device (100) can open the first damper (330) based on the fact that the temperature of the indoor air is higher than the temperature of the air passing through the heat exchanger (120, 130). When the temperature of the indoor air is higher than the temperature of the air cooled in the heat exchanger (120, 130), the cooling effect can be increased by preventing the cooled air from passing through the heat exchanger (110). When the cooled air and the indoor air exchange heat in the heat exchanger (110), the cooling effect is reduced. Therefore, when the temperature of the indoor air is relatively high in the cooling and dehumidifying mode (first mode), it is preferable to allow the outdoor air sucked through the first intake port (101a) to flow to the bypass path (331).

[0134] FIG. 9 illustrates an integrated air conditioning system including a ventilation device according to various embodiments.

[0135] Referring to FIG. 9, the integrated air conditioning system (2) may include a ventilation device (100), an outdoor unit (200), a plurality of indoor units (30: 30a, 30b, 30c, 30d), and an integrated controller (50). The ventilation device (100) may be connected to the outdoor unit (200) via a refrigerant pipe (P1). The refrigerant pipe (P1) may correspond to the first refrigerant pipe (121) described above. The plurality of indoor units (30) may be connected to the outdoor unit (200) via a refrigerant pipe (P2). The outdoor unit (200) may supply refrigerant to each of the plurality of indoor units (30) via the refrigerant pipe (P2).

[0136] A plurality of indoor units (30) may be installed within each of a plurality of different indoor spaces. For example, a plurality of indoor units (30) may be installed within each of a plurality of offices, a plurality of guest rooms, or a plurality of rooms within a building. As each of the plurality of indoor units (30) operates, the air in each of the indoor spaces in which the plurality of indoor units (30) are installed can be directly conditioned (e.g., cooled).

[0137] The ventilation device (100) can be installed in various spaces inside a building. For example, the ventilation device (100) can be installed in a space such as a veranda or a multipurpose room of an apartment. The first intake port (101a), the second intake port (101c), the first exhaust port (101b), and the second exhaust port (101d) provided in the housing (101) of the ventilation device (100) can each be connected to a duct. The duct connected to the second intake port (101c) and the first exhaust port (101b) can extend to an indoor space. For example, a hole communicating with the ventilation device (100) can be provided in the ceiling or wall of the indoor space. The duct connected to the first intake port (101a) and the second exhaust port (101d) can extend to an outdoor space.

[0138] Although the ventilation device (100) and the outdoor unit (200) are exemplified as one each, more than one ventilation device (100) and one outdoor unit (200) may be provided. In addition, although the indoor unit (30) is exemplified as four, the number of indoor units (30) is not limited to the exemplified number. More than one indoor unit (30) may be provided.

[0139] The integrated controller (50) can be electrically connected to the ventilation device (100), the outdoor unit (200), and the plurality of indoor units (30). The integrated controller (50) can be electrically connected to the ventilation device (100), the outdoor unit (200), and the plurality of indoor units (30) via a communication line (CL). The integrated controller (50) can control the operations of the ventilation device (100), the outdoor unit (200), and the plurality of indoor units (30).

[0140] The integrated controller (50) can obtain user input, operate the integrated air conditioning system (2) in response to the user input, and display information of the integrated air conditioning system (2). The integrated controller (50) can control the ventilation device (100) and the indoor unit (30) based on the indoor temperature and indoor humidity of the indoor space in which the indoor unit (30) is placed.

[0141] By appropriately controlling the operation of the ventilation device (100) and the indoor unit (300) based on the indoor temperature and indoor humidity, the cooling efficiency and dehumidification efficiency can be improved, and energy for cooling and dehumidification can be saved.

[0142] The operating method of the ventilation device (100) described above can also be used in the integrated air conditioning system (2) described in FIG. 9.

[0143] Fig. 10 is a control block diagram of a ventilation device according to various embodiments.

[0144] Referring to FIG. 10, the ventilation device (100) may include an outdoor temperature sensor (141), an indoor temperature sensor (142), a heat exchange temperature sensor (143), an outdoor humidity sensor (151), an indoor humidity sensor (152), a sterilizing device (113) (e.g., including at least one of a heater, an infrared lamp, or an ultraviolet light emitting diode), a first blower (109a), a second blower (109b), a first expansion device (160) (e.g., including a valve), a second expansion device (170) (e.g., including a valve), and a first damper (330). The ventilation device (100) may further include a second damper (340) and a third damper (350).

[0145] Additionally, the ventilation device (100) may include a user interface (180) (e.g., including an interface circuit), a memory (191), and a processor (192) (e.g., including a processing circuit). The processor (192) may be electrically connected to components of the ventilation device (100) and may control each of the components. For example, the processor (192) may adjust the opening degrees of each of the first damper (330), the second damper (340), and the third damper (350).

[0146] The memory (191) can remember / store various information necessary for the operation of the ventilation device (100). The memory (191) can store instructions, applications, data, and / or programs necessary for the operation of the ventilation device (100). The processor (192) can generate a control signal for controlling the operation of the ventilation device (100) based on the instructions, applications, data, and / or programs stored in the memory (191). The processor (192) can include various processing circuits and / or a plurality of processors. For example, the term 'processor' can include various processing circuits including at least one processor, wherein one or more of the at least one processor can be configured to individually and / or collectively perform various functions in a distributed manner. When "processor," "at least one processor," and "one or more processors" are described herein as being configured to perform multiple functions, these terms include, but are not limited to, situations where one processor performs some of the recited functions and another processor performs other of the recited functions, and situations where a single processor can perform all of the recited functions. Furthermore, the at least one processor may comprise a combination of processors that perform various recited / disclosed functions, for example, in a distributed manner. At least one processor may execute program instructions to achieve or perform various functions.

[0147] The ventilation device (100) may further include a communication interface for communicating with the outdoor unit (200) and / or the integrated controller (50). The ventilation device (100) may also operate based on a control signal transmitted from the integrated controller (50) via the communication interface.

[0148] The outdoor temperature sensor (141) can detect a first temperature (outdoor temperature) of the outdoor air and transmit an electrical signal corresponding to the detected first temperature to the processor (192). The outdoor temperature sensor (141) may be referred to as a first temperature sensor. The indoor temperature sensor (142) can detect a second temperature (indoor temperature) of the indoor air and transmit an electrical signal corresponding to the detected second temperature to the processor (192). The indoor temperature sensor (142) may be referred to as a second temperature sensor. The heat exchange temperature sensor (143) can detect the temperature of the air that has passed through the first heat exchanger (120) and the second heat exchanger (130) and transmit an electrical signal corresponding to the detected temperature to the processor (192). The heat exchange temperature sensor (143) may be referred to as a third temperature sensor.

[0149] The outdoor humidity sensor (151) can detect the first humidity (outdoor humidity) of the outdoor air and transmit an electrical signal corresponding to the detected first humidity to the processor (192). The indoor humidity sensor (152) can detect the second humidity (indoor humidity) of the indoor air and transmit an electrical signal corresponding to the detected second humidity to the processor (192). The outdoor humidity sensor (151) can be referred to as a first humidity sensor. The indoor humidity sensor (152) can be referred to as a second humidity sensor.

[0150] The processor (192) can determine a difference value (first difference value) between a first humidity of outdoor air and a second humidity of indoor air. The processor (192) can determine a difference value (second difference value) between a first temperature of outdoor air and a second temperature of indoor air. The processor (192) can determine an operating mode of the ventilation system (1) based on the first humidity of outdoor air, the second humidity of indoor air, the first temperature of outdoor air, and the second temperature of indoor air.

[0151] The sterilizing device (113) can sterilize indoor air sucked in through the second suction port (101c). For example, the sterilizing device (113) may include at least one of a heater, an infrared lamp, or a UV-LED. The processor (192) can control the on / off of the sterilizing device (113).

[0152] The first blower (109a) is arranged on the first outlet (101b) side of the housing (101) and can generate wind power necessary to discharge air through the first outlet (101b). The second blower (109b) is arranged on the second outlet (101d) side of the housing (101) and can generate wind power necessary to discharge air through the second outlet (101d). The processor (192) can control the rotation speed of the first blower (109a) and the rotation speed of the second blower (109b). The processor (192) can control the first blower (109a) and the second blower (109b) based on the operating mode of the ventilation system (1).

[0153] The first expansion device (160) includes a valve and can selectively expand the refrigerant supplied to the first heat exchanger (120). The second expansion device (170) includes a valve and can selectively expand the refrigerant discharged from the first heat exchanger (120) and supplied to the second heat exchanger (130) through the second refrigerant pipe (131). The processor (192) can control the opening degrees of each of the first expansion device (160) and the second expansion device (170). The processor (192) can control the compressor (211), the four-way valve (213), the first expansion device (160), and the second expansion device (170) based on the operating mode of the ventilation system (1).

[0154] The first damper (330) may be located at the upper portion of the heat exchanger (110). The first damper (330) may also be provided at the lower portion of the heat exchanger (110). The first damper (330) may open or close a bypass passage (331) formed between the first inlet (101a) and the first outlet (101b). The processor (192) may control the opening or closing of the first damper (330). The processor (192) may also adjust the opening degree of the first damper (330). The processor (192) may control the first damper (330) based on the operating mode of the ventilation system (1).

[0155] The user interface (180) includes various circuits and can obtain various user inputs regarding the operation of the ventilation device (100). The user interface (180) can output an electrical signal (voltage or current) corresponding to the user input to the processor (192) of the ventilation device (100). The user interface (180) can include various buttons, dials, and / or touch displays.

[0156] For example, the user interface (180) can obtain user input to set whether to allow or block the inflow of outdoor air. In other words, the user interface (180) can obtain user input to set outdoor air circulation or indoor air circulation. Depending on the user input, outdoor air circulation or indoor air circulation can be selected. Outdoor air circulation or indoor air circulation can also be automatically set based on outdoor temperature, indoor temperature, outdoor humidity, and / or indoor humidity.

[0157] When outside air circulation is selected, the processor (192) can close the second damper (340) provided between the first intake chamber (104) and the first exhaust chamber (106) and open the third damper (350) provided at the first inlet (101a). When inside air circulation is selected, the processor (192) can open the second damper (340) provided between the first intake chamber (104) and the first exhaust chamber (106) and close the third damper (350) provided at the first inlet (101a).

[0158] Additionally, the user interface (180) may display various information regarding the operation of the ventilation device (100). For example, the user interface (180) may display images, text, and / or graphical user interfaces regarding the operation of the ventilation device (100). The user interface (180) may include various types of display panels.

[0159] When outdoor air is introduced into the heat exchanger (110) by outside air circulation, moisture contained in the outdoor air may be absorbed by the heat exchanger (110). If a large amount of moisture accumulates in the heat exchanger (110), mold and / or bacteria may grow in the heat exchanger (110). In addition, in the summer when a high temperature and high humidity environment is created, if moisture from the outdoor space is supplied to the indoor space, the indoor environment may deteriorate. The disclosed ventilation device (100) can remove moisture contained in the outdoor air before the outdoor air is introduced into the heat exchanger (110) by arranging the heat exchanger (120, 130) on the side of the first intake port (101a) of the housing (101) through which outdoor air is introduced.

[0160] For outside air circulation, the processor (192) of the ventilation system (1) closes the second damper (340) provided between the first intake chamber (104) and the first exhaust chamber (106), and opens the third damper (350) provided at the first inlet (101a). The processor (192) of the ventilation system (1) can determine the operation mode of the ventilation system (1) as a cooling dehumidification mode (first mode) or a constant temperature dehumidification mode (second mode) based on whether the second difference between the first temperature of the outdoor air and the second temperature of the indoor air is greater than the second reference value when the first difference between the first humidity of the outdoor air and the second humidity of the indoor air is greater than the first reference value.

[0161] The processor (192) can determine the operation mode of the ventilation system as a cooling and dehumidification mode (first mode) based on the fact that a first difference between a first humidity of the outdoor air and a second humidity of the indoor air is greater than a first reference value and a second difference between a first temperature of the outdoor air and a second temperature of the indoor air is greater than a second reference value. In other words, when the outdoor humidity is higher than the indoor humidity and the outdoor temperature is higher than the indoor temperature, the ventilation system (1) can operate in the cooling and dehumidification mode to remove moisture contained in the outdoor air flowing into the housing (101) and lower the temperature of the outdoor air.

[0162] The processor (192) can adjust the opening of the first expansion device (160) so that the refrigerant is expanded by the first expansion device (160) in the cooling and dehumidifying mode (first mode). In the cooling and dehumidifying mode (first mode), the second expansion device (170) can be controlled to expand or not expand the refrigerant.

[0163] The first reference value for the difference between outdoor and indoor humidity and the second reference value for the difference between outdoor and indoor temperatures can be determined in various ways depending on the design. Furthermore, the first and second reference values ​​can be changed based on user input via the user interface (180). For example, the first and second reference values ​​can each be 0.

[0164] Additionally, when the ventilation system (1) operates in the cooling and dehumidifying mode (first mode), the processor (192) can open the first damper (330) to open the bypass path (331). The processor (192) can open the first damper (330) based on the second temperature of the indoor air being higher than the third temperature detected by the heat exchange temperature sensor (143) in the cooling and dehumidifying mode (first mode).

[0165] When the temperature of the indoor air is higher than the temperature of the air cooled in the heat exchanger (120, 130), the cooling effect can be increased by preventing the cooled air from passing through the heat exchanger (110). When the cooled air and the indoor air exchange heat in the heat exchanger (110), the cooling effect is reduced. Therefore, when the temperature of the indoor air is relatively high in the cooling and dehumidification mode (first mode), it is preferable to allow the outdoor air sucked in through the first intake port (101a) to flow to the bypass path (331).

[0166] The processor (192) can determine the operation mode of the ventilation system as a constant temperature dehumidification mode (second mode) based on the fact that the first difference between the first humidity of the outdoor air and the second humidity of the indoor air is greater than the first reference value and the second difference between the first temperature of the outdoor air and the second temperature of the indoor air is less than or equal to the second reference value. In other words, when the outdoor humidity is higher than the indoor humidity but the outdoor temperature is lower than or equal to the indoor temperature, it is necessary to remove moisture contained in the indoor air, but there is no need to lower the temperature of the outdoor air. Therefore, the ventilation system (1) can operate in the constant temperature dehumidification mode to remove moisture contained in the outdoor air flowing into the housing (101) and maintain the indoor temperature.

[0167] The processor (192) can adjust the opening of the second expansion device (170) so that the refrigerant is expanded by the second expansion device (170) without expansion of the refrigerant by the first expansion device (160) in the constant temperature dehumidification mode (second mode). In the constant temperature dehumidification mode (second mode), the first expansion device (160) can be controlled so as not to expand the refrigerant.

[0168] The processor (192) can determine the operation mode of the ventilation system (1) as a moisture recovery mode (third mode) or a ventilation mode (fourth mode) based on whether the first temperature of the outdoor air is lower than the reference temperature when the first difference value between the first humidity of the outdoor air and the second humidity of the indoor air is less than or equal to the first reference value.

[0169] The reference temperature can be determined in various ways depending on the design. Furthermore, the reference temperature can be changed based on user input via the user interface (180). For example, the reference temperature may be 0 degrees.

[0170] The processor (192) may determine the operation mode of the ventilation system (1) as a moisture recovery mode (third mode) based on the fact that the first difference between the first humidity of the outdoor air and the second humidity of the indoor air is less than or equal to the first reference value and the first temperature of the outdoor air is lower than the reference temperature. If the outdoor humidity is lower than the indoor humidity and the outdoor temperature is lower than the reference temperature, dehumidification of the outdoor air is unnecessary and freezing prevention of the heat exchanger (110) may be required. Therefore, the ventilation system (1) may operate in the moisture recovery mode to increase the temperature of the outdoor air supplied to the heat exchanger (110).

[0171] Even if the outdoor air temperature is below zero, freezing of the heat exchanger (110) does not occur, enabling the use of the heat exchanger (110), and moisture contained in indoor air passing through the heat exchanger (110) can be recovered back into the indoor space. Accordingly, indoor humidity can be appropriately maintained even during the dry winter season.

[0172] The processor (192) can control the second expansion device (170) to not expand the refrigerant in the moisture recovery mode (third mode). In the moisture recovery mode (third mode), the first expansion device (160) can be controlled to expand or not expand the refrigerant.

[0173] The processor (192) may determine the operation mode of the ventilation system (1) as the ventilation mode (fourth mode) based on the fact that the first difference between the first humidity of the outdoor air and the second humidity of the indoor air is less than or equal to the first reference value and the first temperature of the outdoor air is higher than or equal to the reference temperature. If the outdoor humidity is lower than the indoor humidity, dehumidification of the outdoor air may not be necessary, and if the outdoor temperature is above zero, freezing of the heat exchanger (110) may not occur. In this case, heat exchange between the outdoor air and the heat exchanger (120, 130) may be unnecessary. The ventilation system (1) may operate in the ventilation mode to stop the compressor (211) and perform ventilation using only the heat exchanger (110).

[0174] Moisture contained in indoor air may be absorbed by the heat exchanger (110) through internal circulation. For internal circulation, the processor (192) opens the second damper (340) provided between the first intake chamber (104) and the first exhaust chamber (106), and closes the third damper (350) provided at the first inlet (101a).

[0175] During the betting cycle, the processor (192) of the ventilation system (1) can determine the operating mode of the ventilation system (1) based on the indoor temperature, indoor humidity, target temperature, and target humidity. The target temperature and target humidity can be set by the user. The user can set the target temperature and target humidity using the user interface (180) of the ventilation system (1) or the input interface (52) of the integrated controller (50). The target temperature and target humidity can also be automatically set based on the outdoor environment and / or the indoor environment.

[0176] During the betting cycle, the processor (192) may determine the operating mode of the ventilation system (1) as a heating mode based on whether the indoor temperature is lower than the target temperature. Conversely, when the indoor temperature is higher than or equal to the target temperature, the processor (192) may determine the operating mode of the ventilation system (1) as a cooling dehumidification mode or a constant temperature dehumidification mode based on whether the indoor humidity is higher than the target humidity.

[0177] When the indoor temperature is higher than the target temperature and the indoor humidity is higher than the target humidity, the operation mode of the ventilation system (1) may be determined as a cooling and dehumidification mode. When the indoor temperature is equal to the target temperature and the indoor humidity is higher than the target humidity, the operation mode of the ventilation system (1) may be determined as a constant temperature and dehumidification mode.

[0178] When the indoor temperature is higher than or equal to the target temperature during the betting cycle, but the indoor humidity is lower than or equal to the target temperature, the processor (192) can determine the operation mode of the ventilation system (1) to the blowing mode.

[0179] The disclosed ventilation system (1) can provide various operating modes based on outdoor humidity, indoor humidity, outdoor temperature, and / or indoor temperature. The disclosed ventilation system (1) can remove moisture contained in the air and cool or heat the air before the outdoor air or indoor air passes through the heat exchanger (110). Accordingly, air with an appropriate humidity and temperature can be supplied to the indoor space. In addition, the disclosed ventilation system (1) can prevent and / or reduce freezing of the heat exchanger (110), thereby increasing the usability of the heat exchanger (110) even in environments with low outdoor temperatures.

[0180] Figure 11 is a control block diagram of an integrated controller according to various embodiments.

[0181] Referring to FIG. 11, the integrated controller (50) may include a display (51), an input interface (52) (e.g., including various interface circuits), a communication interface (53) (e.g., including various communication circuits), and a memory (54), and may include a processor (55) (e.g., including a processing circuit) electrically connected thereto. The integrated controller (50) may provide a user interface for interaction between the integrated air conditioning system (2) and a user.

[0182] The display (51) can display information regarding the status and / or operation of the integrated air conditioning system (2). The display (51) can display information input by the user or information provided to the user on various screens. The display (51) can display information related to the operation of the integrated air conditioning system (2) in the form of at least one image or text. In addition, the display (51) can display a graphical user interface (GUI) that enables control of the integrated air conditioning system (2). That is, the display (51) can display a user interface element (UI element) such as an icon.

[0183] The display (51) may include various types of display panels. For example, the display (51) may include a liquid crystal display panel (LCD Panel), a light emitting diode panel (LED Panel), an organic light emitting diode panel (OLED Panel), or a micro LED panel.

[0184] The display (51) may be implemented as a touch display. The touch display may include a display panel that displays an image and a touch panel that receives a touch input. The display panel may convert image data received from the processor (55) into an optical signal that can be viewed by the user. The touch panel may identify a user's touch input and provide an electrical signal corresponding to the received touch input to the processor (55).

[0185] The input interface (52) of the integrated controller (50) includes various input circuits and can output electrical signals (voltage or current) corresponding to user input to the processor (55). The input interface (52) can include various buttons and may also include a dial. If the display (51) is provided as a touch display, a separate input interface (52) may not be provided in the integrated controller (50). That is, the integrated controller (50) can obtain user input. For example, the integrated controller (50) can obtain user input for setting a target temperature and target humidity, user input for turning on or off each of the ventilation device (100) and the indoor unit (30), or user input for setting each operation mode of the ventilation device (100) and the indoor unit (30).

[0186] The communication interface (53) includes various communication circuits and can communicate with the ventilation device (100), the outdoor unit (200), and the indoor unit (30). The communication interface (53) of the integrated controller (50) can be connected to the communication interfaces of each of the ventilation device (100), the outdoor unit (200), and the indoor unit (30) via a communication line (CL). The integrated controller (50) can transmit a control signal to the ventilation device (100), the outdoor unit (200), and the indoor unit (30) via the communication interface (53).

[0187] Additionally, the communication interface (53) may include a wired communication module and / or a wireless communication module for communicating with an external device (e.g., a mobile device or a computer). The wired communication module may communicate with the external device via a wide area network such as the Internet, and the wireless communication module may communicate with the external device via an access point connected to the wide area network. Through this, a user can remotely control the integrated air conditioning system (2).

[0188] The memory (54) can store / remember various types of information necessary for the operation of the integrated air conditioning system (2). The memory (54) can store instructions, applications, data, and / or programs necessary for the operation of the integrated air conditioning system (2). For example, the memory (54) can store data regarding a reference temperature and reference humidity for determining the operation of the ventilation device (100) and the indoor unit (30).

[0189] The memory (54) may include volatile memory such as Static Random Access Memory (S-RAM) or Dynamic Random Access Memory (D-RAM) for temporarily storing data. In addition, the memory (540) may include nonvolatile memory such as Read Only Memory (ROM), Erasable Programmable Read Only Memory (EPROM), or Electrically Erasable Programmable Read Only Memory (EEPROM) for long-term storage of data.

[0190] The processor (55) can generate a control signal for controlling the operation of the integrated air conditioning system (2) based on instructions, applications, data and / or programs stored in the memory (54). The processor (55) is hardware and can include logic circuits and arithmetic circuits. The processor (55) can process data according to the program and / or instructions provided from the memory (54) and generate a control signal according to the processing result. The memory (54) and the processor (55) can be implemented as one control circuit or as multiple circuits. The processor (55) can include various processing circuits and / or multiple processors. For example, the term 'processor' can include various processing circuits including at least one processor, wherein one or more of the at least one processor can be configured to individually and / or collectively perform various functions in a distributed manner. When "processor," "at least one processor," and "one or more processors" are described herein as being configured to perform multiple functions, these terms include, but are not limited to, situations where one processor performs some of the recited functions and another processor performs other of the recited functions, and situations where a single processor can perform all of the recited functions. Furthermore, the at least one processor may comprise a combination of processors that perform various recited / disclosed functions, for example, in a distributed manner. At least one processor may execute program instructions to achieve or perform various functions.

[0191] Meanwhile, the components of the ventilation device (100), outdoor unit (200), indoor unit (30), and integrated controller (50) are not limited to those described in FIGS. 10 and 11. Some of the components of each of the aforementioned ventilation device (100), outdoor unit (200), indoor unit (30), and integrated controller (50) may be omitted, or other components may be added.

[0192] Fig. 12 illustrates the flow of air passing through a heat exchanger within a ventilation device according to various embodiments when circulating outside air. Fig. 13 illustrates an embodiment in which the arrangement of the heat exchanger is different in the ventilation device of Fig. 12.

[0193] Referring to FIGS. 12 and 13, for outside air circulation, the processor (192) of the ventilation system (1) can close the second damper (340) provided between the first intake chamber (104) and the first exhaust chamber (106) and open the third damper (350) provided at the first inlet (101a). In FIGS. 12 and 13, the bypass path (331) is closed by the first damper (330).

[0194] When the outside air circulates, the processor (192) of the ventilation device (100) can operate the first blower (109a) and the second blower (109b) in each of the cooling dehumidification mode (first mode), the constant temperature dehumidification mode (second mode), the moisture recovery mode (third mode), and the ventilation mode (fourth mode). Depending on the operation of the first blower (109a), the outside air (OA) can be sucked into the housing (101) through the first intake port (101a) of the housing (101).

[0195] In Fig. 12, outdoor air (OA) can be introduced into the heat exchanger (110) through the second heat exchanger (130) and the first heat exchanger (120). In Fig. 13, outdoor air (OA) can be introduced into the first heat exchanger (120) through the second heat exchanger (130) and the heat exchanger (110).

[0196] When refrigerant is supplied to the heat exchanger (120, 130), the outdoor air (OA) can be cooled or heated by the heat exchanger (120, 130). Moisture contained in the outdoor air (OA) can also be removed by the heat exchanger (120, 130).

[0197] According to the operation of the second blower (109b), indoor air (RA) can be sucked into the housing (101) through the second suction port (101c) of the housing (101). The sucked indoor air (RA) can be introduced into the heat exchanger (110).

[0198] Cooled or heated outdoor air (OA) and indoor air (RA) can exchange heat without contacting each other in a heat exchanger (110). Outdoor air (OA) that has passed through the heat exchangers (120, 130) and the heat exchanger (110) is supplied to the indoor space through the first outlet (101b). Indoor air (RA) that has passed through the heat exchanger (110) is discharged to the outdoor space through the second outlet (101d).

[0199] Figure 14 illustrates the flow of air passing through the bypass path inside the ventilation device of Figure 12.

[0200] Referring to Fig. 14, when the ventilation device (100) operates in the cooling and dehumidifying mode (first mode), the first damper (330) may be opened to open the bypass passage (331). With the opening of the first damper (330), the outdoor air (OA) introduced through the first intake port (101a) may move to the first outlet port (101b) through the bypass passage (331) formed at the top of the heat exchanger (110). In this case, the outdoor air (OA) may not pass through the heat exchanger (110) due to the difference in flow rate. On the other hand, the indoor air (RA) introduced through the second intake port (101c) may pass through the heat exchanger (110).

[0201] The ventilation system (1) can open the first damper (330) based on the temperature of the indoor air being higher than the temperature of the air passing through the heat exchanger (120, 130). When the temperature of the indoor air is higher than the temperature of the air cooled in the heat exchanger (120, 130), the cooling effect can be increased by preventing heat exchange between the air cooled in the total heat exchanger (110) and the indoor air (RA).

[0202] Figure 15 illustrates the flow of air passing through the bypass path inside the ventilation device of Figure 13.

[0203] Referring to Fig. 15, since the second heat exchanger (130) is located on the side of the first suction port (101a), while the first heat exchanger (120) is located between the heat exchanger (110) and the first blower (109a), the bypass passage (331) can be opened in the cooling dehumidification mode (first mode) and the constant temperature dehumidification mode (second mode). That is, when the heat exchanger (110) is located between the first heat exchanger (120) and the second heat exchanger (130), the first damper (330) can be opened so that the bypass passage (331) is opened in the cooling dehumidification mode (first mode) and the constant temperature dehumidification mode (second mode) so as not to reduce the cooling effect of the air by the second heat exchanger (130).

[0204] Fig. 16 illustrates the flow of air within a ventilation device according to various embodiments during a circulation cycle. Fig. 17 illustrates an embodiment in which the arrangement of the heat exchanger is different in the ventilation device of Fig. 16.

[0205] Referring to FIGS. 16 and 17, for the circulation of the inside, the processor (192) can open the second damper (340) provided between the first intake chamber (104) and the first exhaust chamber (106), and close the third damper (350) provided at the first inlet (101a).

[0206] During the circulation of air, in each of the cooling dehumidification mode, the constant temperature dehumidification mode, the heating mode, and the blowing mode, the processor (192) can operate the first blower (109a) and stop the second blower (109b). Depending on the operation of the first blower (109a), indoor air (RA) can be sucked into the housing (101) through the second intake port (101c) of the housing (101).

[0207] Indoor air (RA) can pass through the connecting passage opened by the second damper (340). In Fig. 16, indoor air (RA) can flow into the heat exchanger (110) through the second heat exchanger (130) and the first heat exchanger (120). In Fig. 17, indoor air (RA) can flow into the first heat exchanger (120) through the second heat exchanger (130) and the heat exchanger (110).

[0208] When refrigerant is supplied to the heat exchanger (120, 130), indoor air (RA) can be cooled or heated by the heat exchanger (120, 130). Moisture contained in the indoor air (RA) can also be removed by the heat exchanger (120, 130).

[0209] Indoor air (RA) that has passed through the heat exchanger (120, 130) and the total heat exchanger (110) is supplied to the indoor space through the first outlet (101b).

[0210] Fig. 18 is a flowchart illustrating a method for controlling a ventilation system according to various embodiments.

[0211] Referring to FIG. 18, the processor (192) of the ventilation system (1) opens the third damper (350) provided in the first inlet (101a) as outside air circulation is established. As the first inlet (101a) is opened, outside air may be allowed to flow into the housing (101) of the ventilation device (100) (1801). In addition, the processor (192) may close the second damper (340).

[0212] The processor (192) of the ventilation system (1) can detect a first humidity (outdoor humidity) of outdoor air by controlling an outdoor humidity sensor (151) and a second humidity (indoor humidity) of indoor air by controlling an indoor humidity sensor (152) (1082). The processor (192) can detect a first temperature (outdoor temperature) of outdoor air by controlling an outdoor temperature sensor (141) and a second temperature (indoor temperature) of indoor air by controlling an indoor temperature sensor (142) (1803).

[0213] The processor (192) can determine the operating mode of the ventilation system (1) based on the first humidity of the outdoor air, the second humidity of the indoor air, the first temperature of the outdoor air, and the second temperature of the indoor air (1804). As the operating modes of the ventilation system (1), a cooling dehumidification mode (first mode) for drying and cooling the outdoor air, a constant temperature dehumidification mode (second mode) for drying and heating the outdoor air, a moisture recovery mode (third mode) for heating the outdoor air, and a ventilation mode (fourth mode) for stopping the operation of the compressor can be provided.

[0214] The processor (192) can control the compressor (211), the four-way valve (213), the first expansion device (160), and the second expansion device (170) based on the determined operation mode of the ventilation system (1) (1404). In addition, the processor (192) can control the first blower (109a), the second blower (109b), and the first damper (330) based on the operation mode of the ventilation system (1).

[0215] In the cooling dehumidification mode (first mode) and the constant temperature dehumidification mode (second mode), the compressor (211) and the four-way valve (213) can be controlled so that the refrigerant circulates in the order of the compressor (211) to the outdoor heat exchanger (220), the first heat exchanger (120), and the second heat exchanger (130).

[0216] Additionally, in the cooling and dehumidifying mode (first mode), the first expansion device (160) can be controlled to expand the refrigerant, and the second expansion device (170) can be controlled to expand or not expand the refrigerant. In the constant temperature dehumidifying mode (second mode), the first expansion device (160) can be controlled not to expand the refrigerant, and the second expansion device (170) can be controlled to expand the refrigerant.

[0217] In the moisture recovery mode (third mode), the direction in which the refrigerant flows may be opposite to the direction in which the refrigerant flows in the cooling dehumidification mode (first mode) and the constant temperature dehumidification mode (second mode). In the moisture recovery mode (third mode), the compressor (211) and the four-way valve (213) may be controlled so that the refrigerant circulates in the order of the second heat exchanger (130), the first heat exchanger (120), and the outdoor heat exchanger (220) from the compressor (211). In the moisture recovery mode (third mode), the second expansion device (170) may be controlled not to expand the refrigerant, and the first expansion device (160) may be controlled to expand or not to expand the refrigerant.

[0218] In ventilation mode (mode 4), the operation of the compressor (211) can be stopped so that the refrigerant does not flow.

[0219] The control method of the ventilation system (1) described in Fig. 18 can also be performed by the processor (55) of the integrated air conditioning system (2).

[0220] Figure 19 is a flowchart explaining in more detail the control method of the ventilation system described in Figure 18.

[0221] Referring to FIG. 19, steps 1901, 1902, and 1903 correspond to steps 1801, 1802, and 1803 described in FIG. 18. The processor (192) of the ventilation system (1) can determine a difference value (a first difference value) between a first humidity of outdoor air and a second humidity of indoor air (1904). The processor (192) can determine whether the first difference value between the first humidity of outdoor air and the second humidity of indoor air is greater than a first reference value (1905). If the first difference value between the first humidity of outdoor air and the second humidity of indoor air is greater than the first reference value, the processor (192) can determine a difference value (a second difference value) between a first temperature of outdoor air and a second temperature of indoor air (1906). The processor (192) can determine whether a second difference value between a first temperature of outdoor air and a second temperature of indoor air is greater than a second reference value (1907).

[0222] The first reference value for the difference between outdoor and indoor humidity and the second reference value for the difference between outdoor and indoor temperatures can be determined in various ways depending on the design. Furthermore, the first and second reference values ​​can be changed based on user input via the user interface (180). For example, the first and second reference values ​​can each be 0.

[0223] The processor (192) can determine the operation mode of the ventilation system as a cooling and dehumidification mode (first mode) based on the fact that a first difference between a first humidity of the outdoor air and a second humidity of the indoor air is greater than a first reference value and a second difference between a first temperature of the outdoor air and a second temperature of the indoor air is greater than a second reference value (1908). In other words, when the outdoor humidity is higher than the indoor humidity and the outdoor temperature is higher than the indoor temperature, the ventilation system (1) can operate in the cooling and dehumidification mode to remove moisture contained in the outdoor air flowing into the housing (101) and lower the temperature of the outdoor air.

[0224] The processor (192) can determine the operation mode of the ventilation system as a constant temperature dehumidification mode (second mode) based on the fact that the first difference between the first humidity of the outdoor air and the second humidity of the indoor air is greater than the first reference value and the second difference between the first temperature of the outdoor air and the second temperature of the indoor air is less than or equal to the second reference value (1909). In other words, when the outdoor humidity is higher than the indoor humidity but the outdoor temperature is lower than or equal to the indoor temperature, it is necessary to remove moisture contained in the indoor air, but there is no need to lower the temperature of the outdoor air. Therefore, the ventilation system (1) can operate in the constant temperature dehumidification mode to remove moisture contained in the outdoor air flowing into the housing (101) and maintain the indoor temperature.

[0225] The processor (192) can determine whether the first temperature of the outdoor air is lower than the reference temperature if the first difference between the first humidity of the outdoor air and the second humidity of the indoor air is less than or equal to the first reference value (1910). The reference temperature can be determined in various ways depending on the design. In addition, the reference temperature can also be changed according to user input via the user interface (180). For example, the reference temperature can be 0 degrees.

[0226] The processor (192) may determine the operation mode of the ventilation system (1) as the moisture recovery mode (third mode) based on the fact that the first difference between the first humidity of the outdoor air and the second humidity of the indoor air is less than or equal to the first reference value and the first temperature of the outdoor air is lower than the reference temperature (1911). When the outdoor humidity is lower than the indoor humidity and the outdoor temperature is lower than the reference temperature, dehumidification of the outdoor air is unnecessary and freezing prevention of the heat exchanger (110) may be required. The ventilation system (1) may operate in the moisture recovery mode to increase the temperature of the outdoor air supplied to the heat exchanger (110). Even if the outdoor temperature is low, since the heat exchanger (110) does not freeze, heat exchange between the outdoor air and the indoor air is possible in the heat exchanger (110), and moisture contained in the indoor air can be recovered back into the indoor space.

[0227] The processor (192) may determine the operation mode of the ventilation system (1) as the ventilation mode (fourth mode) based on the fact that the first difference between the first humidity of the outdoor air and the second humidity of the indoor air is less than or equal to the first reference value and the first temperature of the outdoor air is higher than or equal to the reference temperature (1912). If the outdoor humidity is lower than the indoor humidity, dehumidification of the outdoor air may not be necessary, and if the outdoor temperature is above zero, freezing of the heat exchanger (110) may not occur. In this case, heat exchange between the outdoor air and the heat exchanger (120, 130) may be unnecessary. The ventilation system (1) may operate in the ventilation mode to stop the compressor (211) and perform ventilation using only the heat exchanger (110).

[0228] The control method of the ventilation system (1) described in Fig. 19 can also be performed by the processor (55) of the integrated air conditioning system (2).

[0229] FIG. 20 is a flowchart illustrating an additional embodiment of the control method of the ventilation system described in FIG. 19.

[0230] Referring to FIG. 20, when the ventilation system (1) operates in the cooling and dehumidifying mode (first mode) (1908), the processor (192) can determine whether the second temperature of the indoor air is higher than the third temperature detected by the heat exchange temperature sensor (143) (2001).

[0231] The processor (192) can open the first damper (330) to open the bypass path (331) that bypasses the heat exchanger (110) based on the second temperature of the indoor air being higher than the third temperature detected by the heat exchange temperature sensor (143) (2002).

[0232] When the temperature of the indoor air is higher than the temperature of the air cooled in the heat exchanger (120, 130), the cooling effect can be increased by preventing the cooled air from passing through the heat exchanger (110). When the cooled air and the indoor air exchange heat in the heat exchanger (110), the cooling effect is reduced. Therefore, when the temperature of the indoor air is relatively high in the cooling and dehumidification mode (first mode), it is preferable to allow the outdoor air sucked in through the first intake port (101a) to flow to the bypass path (331).

[0233] The processor (192) can close the first damper (330) to close the bypass path (331) bypassing the heat exchanger (110) based on the second temperature of the indoor air being lower than or equal to the third temperature detected by the heat exchange temperature sensor (143) (2003).

[0234] The control method of the ventilation system (1) described in Fig. 20 can also be performed by the processor (55) of the integrated air conditioning system (2).

[0235] Figure 21 is a flowchart illustrating a method for controlling a ventilation system during a betting cycle.

[0236] Referring to Fig. 21, the processor (192) of the ventilation system (1) opens the second damper (340) provided between the first intake chamber (104) and the first exhaust chamber (106) and closes the third damper (350) provided at the first inlet (101a) as the internal circulation is set. Accordingly, the inflow of outside air into the housing (101) of the ventilation device (100) can be blocked (2101).

[0237] The processor (192) of the ventilation system (1) can set a target temperature and target humidity (2102) based on user input via the user interface (180) or the input interface (52) of the integrated controller (50). The target temperature and target humidity can also be automatically set based on the outdoor environment and / or the indoor environment.

[0238] The processor (192) of the ventilation system (1) can detect indoor humidity by controlling the indoor humidity sensor (152) and detect indoor temperature by controlling the indoor temperature sensor (142) (2103).

[0239] During the betting cycle, the processor (192) can determine the operating mode of the ventilation system (1) as a heating mode based on the indoor temperature being lower than the target temperature (2104, 2105).

[0240] Conversely, when the indoor temperature is higher than or equal to the target temperature, the processor (192) may determine the operating mode of the ventilation system (1) as a cooling dehumidification mode or a constant temperature dehumidification mode based on the indoor humidity being higher than the target humidity.

[0241] When the indoor temperature is higher than the target temperature and the indoor humidity is higher than the target humidity, the processor (192) can determine the operation mode of the ventilation system (1) as a cooling and dehumidification mode (2104, 2106, 2107, 2108).

[0242] When the indoor temperature is equal to the target temperature and the indoor humidity is higher than the target humidity, the processor (192) can determine the operation mode of the ventilation system (1) to be a constant temperature dehumidification mode (2104, 2106, 2107, 2109).

[0243] When the indoor temperature is higher than or equal to the target temperature during the betting cycle, but the indoor humidity is lower than or equal to the target temperature, the processor (192) can determine the operating mode of the ventilation system (1) to the blowing mode (2104, 2106, 2110).

[0244] A ventilation system according to one embodiment may include a ventilation device and an outdoor unit. The ventilation system may include a housing including a first intake port through which outdoor air is sucked into the housing, a second intake port through which indoor air is sucked into the housing, a first outlet port through which the outdoor air is discharged into an indoor space, and a second outlet port through which the indoor air is discharged into an outdoor space; a heat exchanger for performing heat exchange between outdoor air and indoor air; a first heat exchanger provided between the first intake port and the heat exchanger; a second heat exchanger provided between the first intake port and the first heat exchanger; a compressor for supplying refrigerant to the first heat exchanger and the second heat exchanger; a four-way valve for changing the direction in which the refrigerant flows; a first expansion device including a valve provided at an inlet of the first heat exchanger to expand the refrigerant; a second expansion device including a valve provided between the first heat exchanger and the second heat exchanger to expand the refrigerant; and at least one processor including a processing circuit.

[0245] The at least one processor may, individually and / or collectively, determine an operating mode of the ventilation system based on a first humidity of the outdoor air detected by a humidity sensor and a second humidity of the indoor air and a first temperature of the outdoor air and a second temperature of the indoor air detected by a temperature sensor. The at least one processor may control the compressor, the four-way valve, the first expansion device, and the second expansion device based on the operating mode of the ventilation system.

[0246] The at least one processor may, individually and / or collectively, determine as an operating mode of the ventilation system a first mode for drying and cooling the outdoor air, a second mode for drying and heating the outdoor air, a third mode for heating the outdoor air, or a fourth mode for stopping the operation of the compressor.

[0247] The at least one processor may individually and / or collectively control the four-way valve so that the flow direction of the refrigerant in the third mode is opposite to the flow direction of the refrigerant in the first mode and the second mode.

[0248] The at least one processor may individually and / or collectively control an opening of the first expansion device such that the refrigerant is expanded by the first expansion device in the first mode. The at least one processor may individually and / or collectively control an opening of the second expansion device such that the refrigerant is expanded by the second expansion device without expansion of the refrigerant by the first expansion device in the second mode. Alternatively, the at least one processor may individually and / or collectively control the second expansion device such that the second expansion device does not expand the refrigerant in the third mode.

[0249] The at least one processor may, individually and / or collectively, determine the operating mode of the ventilation system as the first mode or the second mode based on whether the second difference between the first temperature of the outdoor air and the second temperature of the indoor air is greater than the second reference value when the first difference between the first humidity of the outdoor air and the second humidity of the indoor air is greater than the first reference value.

[0250] The at least one processor may, individually and / or collectively, determine the operating mode of the ventilation system as the first mode based on whether the second difference value is greater than the second reference value. The at least one processor may determine the operating mode of the ventilation system as the second mode based on whether the second difference value is less than or equal to the second reference value.

[0251] The at least one processor may, individually and / or collectively, determine the operation mode of the ventilation system as the third mode or the fourth mode based on whether the first temperature of the outdoor air is lower than the reference temperature when the first difference value between the first humidity of the outdoor air and the second humidity of the indoor air is less than or equal to the first reference value.

[0252] The at least one processor may, individually and / or collectively, determine the operating mode of the ventilation system as the third mode based on whether the first temperature of the outdoor air is lower than the reference temperature. The processor may, individually and / or collectively, determine the operating mode of the ventilation system as the fourth mode based on whether the first temperature of the outdoor air is higher than or equal to the reference temperature.

[0253] The ventilation system may further include a damper formed between the first intake port and the first exhaust port and configured to open or close a bypass passage that bypasses the heat exchanger. The at least one processor may individually and / or collectively open the damper to open the bypass passage when the ventilation system operates in the first mode.

[0254] The ventilation system may further include a heat exchange temperature sensor provided between the first heat exchanger and the total heat exchanger and detecting the temperature of air passing through the first heat exchanger and the second heat exchanger. The at least one processor may individually and / or collectively open the damper based on the second temperature of the indoor air being higher than the third temperature detected by the heat exchange temperature sensor in the first mode.

[0255] A method for controlling a ventilation system is disclosed, which includes a heat exchanger that performs heat exchange between outdoor air sucked in through a first intake port of a housing and indoor air sucked in through a second intake port of the housing, and a first heat exchanger and a second heat exchanger provided between the first intake port and the heat exchanger.

[0256] A method for controlling a ventilation system according to one embodiment may include detecting a first humidity of the outdoor air and a second humidity of the indoor air by a humidity sensor; detecting a first temperature of the outdoor air and a second temperature of the indoor air by a temperature sensor; determining an operation mode of the ventilation system based on the first humidity of the outdoor air, the second humidity of the indoor air, the first temperature of the outdoor air, and the second temperature of the indoor air, individually and / or collectively, by at least one processor; and controlling, based on the operation mode of the ventilation system, a first expansion device including a compressor for supplying a refrigerant to the heat exchanger, a four-way valve for changing a direction in which the refrigerant flows, a valve provided at an inlet of the first heat exchanger for expanding the refrigerant, and a second expansion device including a valve provided between the first heat exchanger and the second heat exchanger.

[0257] The operation mode of the ventilation system may be determined as a first mode for drying and cooling the outdoor air, a second mode for drying and heating the outdoor air, a third mode for heating the outdoor air, or a fourth mode for stopping the operation of the compressor.

[0258] The above controlling may include controlling the four-way valve so that the flow direction of the refrigerant in the third mode is opposite to the flow direction of the refrigerant in the first mode and the second mode.

[0259] The controlling may include: controlling the opening of the first expansion device so that the refrigerant is expanded by the first expansion device in the first mode; controlling the opening of the second expansion device so that the refrigerant is expanded by the second expansion device without expansion of the refrigerant by the first expansion device in the second mode; or controlling the second expansion device so that expansion of the refrigerant by the second expansion device is prevented and / or reduced in the third mode.

[0260] Determining the operation mode of the ventilation system may include determining the operation mode of the ventilation system as the first mode or the second mode based on whether a second difference between the first temperature of the outdoor air and the second temperature of the indoor air is greater than a second reference value when a first difference between the first humidity of the outdoor air and the second humidity of the indoor air is greater than a first reference value.

[0261] The operation mode of the ventilation system may be determined as the first mode based on the second difference value being greater than the second reference value, or as the second mode based on the second difference value being less than or equal to the second reference value.

[0262] Determining the operation mode of the ventilation system may include determining the operation mode of the ventilation system as the third mode or the fourth mode based on whether the first temperature of the outdoor air is lower than the reference temperature when the first difference value between the first humidity of the outdoor air and the second humidity of the indoor air is less than or equal to the first reference value.

[0263] The operation mode of the ventilation system may be determined as the third mode based on the first temperature of the outdoor air being lower than the reference temperature, or as the fourth mode based on the first temperature of the outdoor air being higher than or equal to the reference temperature.

[0264] The ventilation system may further include a damper for opening or closing a bypass passage bypassing the heat exchanger. The control method may further include, by the processor, individually and / or collectively opening the damper to open the bypass passage when the ventilation system is operating in the first mode.

[0265] Opening the damper may be based on the second temperature of the indoor air being higher than the third temperature of the air passing through the first heat exchanger and the second heat exchanger in the first mode.

[0266] The disclosed ventilation system and its control method can remove moisture contained in outdoor air and cool or heat the air before the outdoor air passes through a heat exchanger. Accordingly, air can be supplied to an indoor space at an appropriate humidity and temperature.

[0267] The disclosed ventilation system and its control method can prevent freezing of the heat exchanger, thereby increasing the usability of the heat exchanger even in an environment with low outdoor temperature.

[0268] In addition, the disclosed invention provides a ventilation system and a control method thereof that can allow or block the inflow of outdoor air depending on the setting.

[0269] Meanwhile, the disclosed embodiments may be implemented in the form of a storage medium storing computer-executable instructions. The instructions may be stored in the form of program code, and when executed by a processor, may generate program modules to perform the operations of the disclosed embodiments.

[0270] A device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, the term "non-transitory storage medium" simply means a tangible device that does not contain signals (e.g., electromagnetic waves). This term does not distinguish between cases where data is permanently stored in the storage medium and cases where data is temporarily stored. For example, a "non-transitory storage medium" may include a buffer in which data is temporarily stored.

[0271] The methods according to various embodiments disclosed in this document may be provided as included in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) via an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product (e.g., a downloadable app) may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0272] The disclosed embodiments have been described with reference to the attached drawings as described above. Those skilled in the art will understand that the present invention can be implemented in forms other than the disclosed embodiments without altering the technical spirit or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

Claims

1. A housing including a first intake port through which outdoor air is sucked into the housing, a second intake port through which indoor air is sucked into the housing, a first outlet port through which the outdoor air is discharged into an indoor space, and a second outlet port through which the indoor air is discharged into an external space; A heat exchanger that performs heat exchange between outdoor air and indoor air; A first heat exchanger provided between the first suction port and the heat exchanger; A second heat exchanger provided between the first suction port and the first heat exchanger; A compressor that supplies refrigerant to the first heat exchanger and the second heat exchanger; A four-way valve for changing the direction in which the refrigerant flows; A first expansion device including a valve provided at the inlet of the first heat exchanger for expanding the refrigerant; A second expansion device including a valve provided between the first heat exchanger and the second heat exchanger to expand the refrigerant; and At least one processor comprising a processing circuit; At least one of the above processors Based on the first humidity of the outdoor air detected by the humidity sensor and the second humidity of the indoor air and the first temperature of the outdoor air detected by the temperature sensor and the second temperature of the indoor air, the operation mode of the ventilation system is determined, A ventilation system that controls the compressor, the four-way valve, the first expansion device and the second expansion device based on the operation mode of the ventilation system.

2. In paragraph 1, At least one of the above processors A ventilation system that determines as an operation mode of the ventilation system a first mode for drying and cooling the outdoor air, a second mode for drying and heating the outdoor air, a third mode for heating the outdoor air, or a fourth mode for stopping the operation of the compressor.

3. In paragraph 2, At least one of the above processors A ventilation system that controls the four-way valve so that the flow direction of the refrigerant in the third mode is opposite to the flow direction of the refrigerant in the first mode and the second mode.

4. In paragraph 3, At least one of the above processors In the first mode, the opening of the first expansion device is adjusted so that the refrigerant is expanded by the first expansion device, or In the second mode, the opening of the second expansion device is adjusted so that the refrigerant is expanded by the second expansion device without expansion of the refrigerant by the first expansion device, or A ventilation system that controls the second expansion device so that the second expansion device does not expand the refrigerant in the third mode.

5. In paragraph 2, At least one of the above processors A ventilation system that determines the operation mode of the ventilation system as the first mode or the second mode based on whether the second difference between the first temperature of the outdoor air and the second temperature of the indoor air is greater than the second reference value when the first difference between the first humidity of the outdoor air and the second humidity of the indoor air is greater than the first reference value.

6. In paragraph 5, At least one of the above processors Based on the second difference value being greater than the second reference value, the operation mode of the ventilation system is determined as the first mode, or A ventilation system that determines the operation mode of the ventilation system as the second mode based on the second difference value being less than or equal to the second reference value.

7. In paragraph 2, At least one of the above processors A ventilation system that determines the operation mode of the ventilation system as the third mode or the fourth mode based on whether the first temperature of the outdoor air is lower than the reference temperature when the first difference value between the first humidity of the outdoor air and the second humidity of the indoor air is less than or equal to the first reference value.

8. In paragraph 7, At least one of the above processors Based on the first temperature of the outdoor air being lower than the reference temperature, the operation mode of the ventilation system is determined as the third mode, or A ventilation system that determines the operation mode of the ventilation system as the fourth mode based on the first temperature of the outdoor air being higher than or equal to the reference temperature.

9. In paragraph 2, Further comprising a damper arranged between the first inlet and the first outlet and opening or closing a bypass path bypassing the heat exchanger; At least one of the above processors A ventilation system that opens the damper to open the bypass path when the ventilation system operates in the first mode.

10. In paragraph 9, Further comprising a heat exchange temperature sensor provided between the first heat exchanger and the heat exchanger and detecting the temperature of air passing through the first heat exchanger and the second heat exchanger; At least one of the above processors A ventilation system that opens the damper based on the second temperature of the indoor air being higher than the third temperature detected by the heat exchange temperature sensor in the first mode.

11. A method for controlling a ventilation system including a heat exchanger that performs heat exchange between outdoor air sucked in through a first intake port of a housing and indoor air sucked in through a second intake port of the housing, and a first heat exchanger and a second heat exchanger provided between the first intake port and the heat exchanger, By a humidity sensor, the first humidity of the outdoor air and the second humidity of the indoor air are detected; By a temperature sensor, the first temperature of the outdoor air and the second temperature of the indoor air are detected; By at least one processor, determining an operation mode of the ventilation system based on the first humidity of the outdoor air, the second humidity of the indoor air, the first temperature of the outdoor air and the second temperature of the indoor air; A method for controlling a ventilation system, comprising: controlling, by at least one processor, a compressor for supplying refrigerant to the heat exchanger, a four-way valve for changing the direction in which the refrigerant flows, a first expansion device including a valve provided at the inlet of the first heat exchanger to expand the refrigerant, and a second expansion device including a valve provided between the first heat exchanger and the second heat exchanger, based on the operation mode of the ventilation system.

12. In paragraph 11, The operating mode of the above ventilation system is A method of controlling a ventilation system, wherein the ventilation system is determined as a first mode for drying and cooling the outdoor air, a second mode for drying and heating the outdoor air, a third mode for heating the outdoor air, or a fourth mode for stopping the operation of the compressor.

13. In paragraph 12, The above control is A method for controlling a ventilation system, comprising: controlling the four-way valve so that the flow direction of the refrigerant in the third mode is opposite to the flow direction of the refrigerant in the first mode and the second mode.

14. In paragraph 13, The above control is, In the first mode, the opening of the first expansion device is adjusted so that the refrigerant is expanded by the first expansion device; or In the second mode, the opening of the second expansion device is adjusted so that the refrigerant is expanded by the second expansion device without expansion of the refrigerant by the first expansion device; or A method of controlling a ventilation system, comprising: controlling the second expansion device so that the second expansion device does not expand the refrigerant in the third mode.

15. In paragraph 12, Determining the operating mode of the above ventilation system A method for controlling a ventilation system, comprising: determining an operation mode of the ventilation system as the first mode or the second mode based on whether a second difference between the first temperature of the outdoor air and the second temperature of the indoor air is greater than a second reference value when a first difference between the first humidity of the outdoor air and the second humidity of the indoor air is greater than a first reference value;

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