WO2023032731A1

WO2023032731A1 - Air conditioning system

Info

Publication number: WO2023032731A1
Application number: PCT/JP2022/031537
Authority: WO
Inventors: 幸子松本; 康史鵜飼; 剛史山川
Original assignee: ダイキン工業株式会社
Priority date: 2021-08-31
Filing date: 2022-08-22
Publication date: 2023-03-09
Also published as: CN117836570A; JP2023126731A; JP2023035012A

Abstract

An air conditioning system according to the present invention is provided with an outdoor unit, an indoor unit, a ventilation device, and a control unit. The ventilation device is capable of carrying out an air discharge operation for suctioning indoor air in and discharging the same to the outside. The indoor unit is capable of carrying out a purification operation for purifying an indoor unit heat exchanger by using water condensed in an indoor heat exchanger. The control unit is capable of causing the ventilation device to carry out the air discharge operation after the purification operation is finished.

Description

air conditioning system

The present disclosure relates to air conditioning systems.

For air conditioners, it has been proposed to use condensed water in the heat exchanger to keep the heat exchanger clean. Patent Literature 1 discloses an operation in which condensed water adhering to the surface of a heat exchanger is heated to kill mold. Further, in paragraph 0065 of Patent Document 1, it is disclosed that an operation for drying the heat exchanger is performed after the end of this operation.

JP 2018-141597 A

When the water condensed in the heat exchanger is used to purify the heat exchanger, the air near the heat exchanger becomes highly humid. When this high-humidity air flows out and diffuses into the indoor space, there is a risk of impairing the comfort of the room.

The purpose of the present disclosure is to suppress the deterioration of the comfort of the indoor space due to the operation of purifying the heat exchanger by using condensed water in the heat exchanger.

In a first aspect of the present disclosure, an outdoor unit (10), an indoor unit (30) having an indoor heat exchanger (34) for heat-exchanging indoor air with a refrigerant, and the indoor unit (30) are installed. An air conditioning system (1) comprising a ventilator (20, 60) for ventilating an indoor space, wherein the ventilator (20, 60) is the air inside the indoor unit (30) or The indoor unit (30) is capable of performing an exhaust operation in which air discharged from the unit (30) is sucked in and discharged to the outside, and the indoor unit (30) uses water condensed in the indoor heat exchanger (34) to generate the indoor heat. A control section (C) is provided which is capable of performing a purification operation for purifying the exchanger (34) and causes the ventilator (20, 60) to perform the exhaust operation during or after the purification operation.

In the first aspect, the control unit (C) causes the ventilator (20, 60) to perform the exhaust operation during or after the purification operation. The ventilator (20, 60) sucks in the air around the indoor heat exchanger (34), which has become highly humid due to the purification operation, from inside the indoor unit (30), or after it flows out from the indoor unit (30) Inhale. The ventilator (20, 60) discharges the sucked high-humidity air to the outside. As a result, the comfort of the indoor space is maintained.

A second aspect of the present disclosure is the air conditioning system (1) of the first aspect, wherein the control unit (C) causes the ventilator (20, 60) to perform the exhaust operation after the purification operation is completed. to run.

In the second aspect, the ventilator (20, 60) performs an exhaust operation after the purification operation ends, and exhausts the air that has become highly humid during the purification operation to the outside.

A third aspect of the present disclosure is the air conditioning system (1) of the first aspect, wherein the purification operation of the indoor unit (30) condenses water vapor in the air in the indoor heat exchanger (34). The controller (C) causes the ventilator (20, 60) to perform the exhaust operation after the condensing operation is completed.

In the third aspect, the ventilator (20, 60) performs exhaust operation after the condensing operation is completed. The ventilator (20, 60) does not perform exhaust operation during execution of the condensation operation. Therefore, during the condensation operation, air containing a certain amount of moisture remains around the indoor heat exchanger (34) without being discharged to the outside. As a result, condensed water can be efficiently generated in the indoor heat exchanger (34) during the condensation operation.

A fourth aspect of the present disclosure is the air conditioning system (1) of the first aspect, wherein the indoor unit (30) performs a drying operation for drying the indoor heat exchanger (34) after the purification operation is finished. and the control unit (C) causes the ventilator (20, 60) to perform the exhaust operation during or after the drying operation.

In the fourth aspect, the ventilator (20, 60) performs the exhaust operation during or after the drying operation. During the drying operation, water adhering to the indoor heat exchanger (34) evaporates, and the air around the indoor heat exchanger (34) becomes highly humid. The air around the indoor heat exchanger (34), which has become highly humid due to the dry operation, is discharged to the outside by the ventilator (20, 60).

A fifth aspect of the present disclosure is the air conditioning system (1) according to any one of the first to fourth aspects, wherein the indoor unit (30) is provided inside the indoor unit (30). The ventilation device (20, 60) has an indoor-side opening (29) connected to the ventilation device (20, 60), and the ventilation device (20, 60) moves the air inside the indoor unit (30) to the indoor side in the exhaust operation. The air is sucked through the opening (29) and discharged to the outside of the room.

In the fifth aspect, the ventilator (20, 60) in the exhaust operation sucks the air inside the indoor unit (30) through the indoor opening (29) and discharges it to the outside.

A sixth aspect of the present disclosure is the air conditioning system (1) according to any one of the first to fourth aspects, wherein the ventilator (20, 60) is provided outside the indoor unit (30). The air discharged from the indoor unit (30) during the exhaust operation is sucked through the indoor opening (63) and discharged to the outside.

In the sixth mode, the ventilator (20, 60) in exhaust operation draws in the air flowing out from the indoor unit (30) through the indoor opening (63) and discharges it to the outside.

FIG. 1 is a diagram showing the configuration of an air conditioning system according to Embodiment 1. FIG. FIG. 2 is a diagram showing a refrigerant circuit and air circulation paths of the air conditioning system of Embodiment 1. FIG. 3 is a schematic cross-sectional view of an air conditioning indoor unit included in the air conditioning system of Embodiment 1. FIG. 4 is a block diagram showing a communication system of the air conditioning system of Embodiment 1. FIG. FIG. 5 is a block diagram showing purification modes performed by the air conditioning system of Embodiment 1. FIG. FIG. 6 is a block diagram showing purification modes performed by the air conditioning system of the second embodiment. FIG. 7 is a block diagram showing purification modes performed by the air conditioning system of the third embodiment. FIG. 8 is a diagram showing the configuration of an air conditioning system according to another embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications are possible without departing from the technical idea of the present disclosure. Each drawing is for the purpose of conceptually explaining the present disclosure, and therefore dimensions, ratios or numbers may be exaggerated or simplified as necessary for ease of understanding.

<<Embodiment 1>>
The air conditioning system (1) of Embodiment 1 will be described.

(1) Overview of Configuration of Air Conditioning System The air conditioning system (1) regulates the temperature and humidity of the air in the target space. The target space in this example is the indoor space (I). As shown in FIG. 1, the air conditioning system (1) has an air conditioning outdoor unit (10) and an air conditioning indoor unit (30). The air conditioning outdoor unit (10) is installed outdoors, and the air conditioning indoor unit (30) is installed indoors. The air conditioning system (1) is a pair type having one air conditioning indoor unit (30) and one air conditioning outdoor unit (10). An air conditioning system (1) has a humidification unit (20). The air conditioning system (1) has a function of humidifying air. The air conditioning system (1) further has the function of ventilating the indoor space (I).

　As shown in Figures 1 and 2, the air conditioning system (1) has a hose (2), a liquid connection pipe (3), and a gas connection pipe (4). The air conditioning indoor unit (30) and the humidifying unit (20) are connected to each other via the hose (2). The air conditioning indoor unit (30) and the air conditioning outdoor unit (10) are connected to each other via a liquid communication pipe (3) and a gas communication pipe (4). Thereby, a refrigerant circuit (R) is configured. The refrigerant circuit (R) is filled with refrigerant. The refrigerant is difluoromethane. However, the refrigerant is not limited to difluoromethane. The refrigerant circuit (R) performs a vapor compression refrigeration cycle.

The refrigerant circuit (R) mainly has a compressor (12), an outdoor heat exchanger (14), an expansion valve (15), a four-way switching valve (16), and an indoor heat exchanger (34). .

The refrigerant circuit (R) performs the first refrigerating cycle and the second refrigerating cycle according to switching of the four-way switching valve (16). The first refrigerating cycle is a refrigerating cycle in which the indoor heat exchanger (34) functions as an evaporator and the outdoor heat exchanger (14) functions as a radiator. The second refrigerating cycle is a refrigerating cycle in which the outdoor heat exchanger (14) functions as a radiator and the indoor heat exchanger (34) functions as an evaporator.

(2) Detailed configuration (2-1) Air conditioner outdoor unit As shown in FIGS. 2 and 4, the air conditioner outdoor unit (10) includes an outdoor casing (11), a compressor (12), and an outdoor fan (13). , an outdoor heat exchanger (14), an expansion valve (15), and a four-way switching valve (16).

The outdoor casing (11) houses a compressor (12), an outdoor fan (13), an outdoor heat exchanger (14), an expansion valve (15) and a four-way switching valve (16). The outdoor casing (11) is formed with an outdoor inlet (11a) and an outdoor outlet (11b). The outdoor suction port (11a) is formed on the rear side of the outdoor casing (11). The outdoor air inlet (11a) is an opening for sucking outdoor air. The outdoor outlet (11b) is formed on the front side of the outdoor casing (11). The outdoor air outlet (11b) is an opening for blowing out air that has passed through the outdoor heat exchanger (14). An outdoor air passage (11c) is formed inside the outdoor casing (11) from the outdoor suction port (11a) to the outdoor outlet (11b).

The compressor (12) sucks and compresses low-pressure gas refrigerant. The compressor (12) is driven by a first motor (M1). The compressor (12) is a variable displacement compressor in which power is supplied from an inverter circuit to the first motor (M1). The compressor (12) is configured such that its operating capacity can be changed by adjusting the operating frequency (rotational speed) of the first motor (M1).

The outdoor fan (13) is arranged in the outdoor air passage (11c). The outdoor fan (13) is rotated by driving the second motor (M2). Air carried by the outdoor fan (13) is sucked into the outdoor casing (11) through the outdoor suction port (11a). This air flows through the outdoor air passageway (11c) and is blown out of the outdoor casing (11) through the outdoor outlet (11b). The outdoor fan (13) conveys outdoor air so as to pass through the outdoor heat exchanger (14).

The outdoor heat exchanger (14) is arranged upstream of the outdoor fan (13) in the outdoor air passage (11c). The outdoor heat exchanger (14) of this example is a fin-and-tube heat exchanger. The outdoor heat exchanger (14) is an example of a heat source heat exchanger. The outdoor heat exchanger (14) exchanges heat between the refrigerant flowing therein and the outdoor air conveyed by the outdoor fan (13).

The expansion valve (15) is an example of a decompression mechanism. The expansion valve (15) reduces the pressure of the refrigerant. The expansion valve (15) is an electrically operated expansion valve whose degree of opening is adjustable. The decompression mechanism may be a temperature-sensitive expansion valve, an expander, a capillary tube, or the like. The expansion valve (15) may be connected to the liquid line of the refrigerant circuit (R), and may be provided in the air conditioning indoor unit (30).

The four-way switching valve (16) is an example of a channel switching mechanism. The four-way switching valve (16) has a first port (P1), a second port (P2), a third port (P3) and a fourth port (P4). The first port (P1) is connected to the discharge of the compressor (12). The second port (P2) is connected to the intake of the compressor (12). The third port (P3) is connected to the gas end of the outdoor heat exchanger (14). The fourth port (P4) is connected to the gas communication pipe (4).

The four-way switching valve (16) is switched between a first state (shown by the solid line in Fig. 2) and a second state (state shown by the broken line in Fig. 2). The four-way switching valve (16) in the first state allows communication between the first port (P1) and the third port (P3) and communication between the second port (P2) and the fourth port (P4). The four-way switching valve (16) in the second state allows communication between the first port (P1) and the fourth port (P4) and communication between the second port (P2) and the third port (P3).

(2-2) Humidification Unit The humidification unit (20) has a function of humidifying air. The humidification unit (20) also has a function of ventilating the indoor space (I). The humidification unit (20) is a ventilation device that ventilates the indoor space (I) in which the air conditioning indoor unit (30) is installed.

The humidification unit (20) is installed outdoors. The humidification unit (20) of this example is integrated with the air conditioner outdoor unit (10). The humidification unit (20) sends moisture in the outdoor air to the air conditioning indoor unit (30). The humidification unit (20) includes a humidification casing (21), a humidification rotor (22), a first fan (23), a switching damper (24), a heater (25), and a second fan (26). have.

The humidifying casing (21) is integrally attached to the outdoor casing (11). The humidification casing (21) houses a humidification rotor (22), a first fan (23), a switching damper (24), a heater (25), and a second fan (26). The humidification casing (21) is formed with a humidification intake port (21a), a humidification exhaust port (21b), and an intake/exhaust port (21c). The humidification suction port (21a) and the suction/exhaust port (21c) are formed on the rear side of the humidification casing (21). The humidification exhaust port (21b) is formed in the front side of the humidification casing (21).

The humidification suction port (21a) is an opening for sucking outdoor air. The humidification exhaust port (21b) is an opening for discharging the air after applying moisture to the humidification rotor (22). The intake/exhaust port (21c) is an opening for taking in outdoor air or discharging air sent from the room. A first passageway (27) extending from the humidification suction port (21a) to the humidification exhaust port (21b) is formed inside the humidification casing (21). A second passageway (28) extending from the air intake/exhaust port (21c) to the connection port (21d) is formed inside the humidification casing (21). One end of the hose (2) is connected to the connection port (21d).

The other end of the hose (2) is connected to the indoor opening (29). As will be described later, the indoor-side opening (29) is arranged inside the air conditioning indoor unit (30). The room-side opening (29) is connected to the humidification unit (20).

The humidification rotor (22) is arranged across the first passageway (27) and the second passageway (28). The humidification rotor (22) is an adsorption member that adsorbs moisture in the air. The humidification rotor (22) is, for example, a disk-shaped humidity control rotor having a honeycomb structure. A humidifying rotor (22) holds an adsorbent such as silica gel, zeolite, or alumina. The adsorbent has the property of adsorbing moisture in the air. Moisture absorbents have the property of desorbing adsorbed moisture when heated.

The humidification rotor (22) is rotated by driving the third motor (M3). The humidification rotor (22) has a moisture absorption area (22A) that adsorbs moisture in the air and a moisture release area (22B) that desorbs moisture in the air. The moisture absorption region (22A) is constituted by a portion of the humidification rotor (22) located in the first passageway (27). The moisture release area (22B) is configured by a portion of the humidification rotor (22) located in the second passageway (28).

The first fan (23) is arranged in the first passageway (27). The first fan (23) is rotated by driving the fourth motor (M4). The first fan (23) is configured to be able to switch the air volume in a plurality of stages by adjusting the rotational speed of the fourth motor (M4). The air conveyed by the first fan (23) is sucked into the humidification casing (21) through the humidification suction port (21a). This air flows through the first passageway (27) and is discharged to the outside of the humidification casing (21) through the humidification exhaust port (21b). The first fan (23) conveys outdoor air so as to pass through the moisture absorption region (22A) of the humidification rotor (22). Moisture contained in the outdoor air flowing through the first passageway (27) is adsorbed by the moisture absorption region (22A) of the humidification rotor (22).

The switching damper (24) is arranged in the second passageway (28). The switching damper (24) has a first entrance (24a) and a second entrance (24b). The first inlet/outlet (24a) communicates with the intake/exhaust port (21c). The second inlet/outlet (24b) communicates with the hose (2) connection port (21d) in the humidification casing (21). The switching damper (24) is switched between a first state and a second state. The switching damper (24) in the first state has a first port (24a) as an inlet for sucking air and a second port (24b) as an outlet for discharging air. The switching damper (24) in the second state has an inlet for sucking air as a second inlet (24b) and an outlet for discharging air as a first inlet (24a). The state of the switching damper (24) is switched by driving the fifth motor (M5).

The heater (25) is arranged between the intake/exhaust port (21c) and the switching damper (24) in the second passageway (28). The heater (25) heats air flowing through the second passageway (28). The heater (25) has a variable output. The temperature of the air passing through the heater (25) changes according to the output of the heater (25).

The second fan (26) is arranged between the first entrance (24a) and the second entrance (24b) of the switching damper (24). The second fan (26) is rotated by driving the sixth motor (M6). The second fan (26) is configured to be able to switch the air volume in a plurality of steps by adjusting the rotation speed of the sixth motor (M6). The flow of air carried by the second fan (26) changes according to the state of the switching damper (24). Specifically, when the switching damper (24) is in the first state, air sucked through the first inlet/outlet (24a) flows out to the second inlet/outlet (24b) as indicated by the solid line arrow in FIG. When the switching damper (24) is in the second state, air sucked through the second inlet/outlet (24b) flows out to the first inlet/outlet (24a) as indicated by the dashed arrow in FIG.

(2-3) Air Conditioner Indoor Unit As shown in FIGS. 1 to 3, the air conditioner indoor unit (30) is installed indoors. The air conditioning indoor unit (30) is a wall-mounted type that is installed on the wall (WL) of the room that forms the indoor space (I). The air conditioning indoor unit (30) includes an indoor casing (31), an indoor fan (32), an air filter (33), an indoor heat exchanger (34), a drain pan (35), and a wind direction adjusting section (36). and

The indoor casing (31) houses an indoor fan (32), an air filter (33), an indoor heat exchanger (34) and a drain pan (35). The indoor casing (31) is formed with an indoor suction port (31a) and an indoor outlet (31b). The indoor suction port (31a) is arranged above the indoor casing (31). The indoor air intake (31a) is an opening for sucking indoor air. The indoor outlet (31b) is arranged below the indoor casing (31). The indoor air outlet (31b) is an opening for blowing out air after heat exchange or air for humidification. The interior of the indoor casing (31) is provided with an indoor air passageway (31c) extending from the indoor air inlet (31a) to the indoor air outlet (31b).

The indoor fan (32) is arranged substantially in the center of the indoor air passage (31c). The indoor fan (32) is an example of a blower. The indoor fan (32) is, for example, a cross-flow fan. The indoor fan (32) is rotated by driving the seventh motor (M7). The indoor fan (32) takes indoor air into the indoor air passageway (31c) and conveys it. The air carried by the indoor fan (32) is sucked into the indoor casing (31) through the indoor suction port (31a). This air flows through the indoor air passageway (31c) and is blown out of the indoor casing (31) from the indoor outlet (31b).

The indoor fan (32) conveys indoor air so as to pass through the indoor heat exchanger (34). The air blown out from the indoor air outlet (31b) is supplied to the indoor space. The indoor fan (32) is configured such that the air volume can be switched in multiple stages by adjusting the rotation speed of the seventh motor (M7).

The air filter (33) is arranged upstream of the indoor heat exchanger (34) in the indoor air passage (31c). The air filter (33) is attached to the indoor casing (31) so that substantially all of the air supplied to the indoor heat exchanger (34) passes through. The air filter (33) collects dust in the air sucked through the indoor air inlet (31a).

The indoor heat exchanger (34) is arranged upstream of the indoor fan (32) in the indoor air passage (31c). The indoor heat exchanger (34) of this example is a fin-and-tube heat exchanger. The indoor heat exchanger (34) is an example of a utilization heat exchanger. The indoor heat exchanger (34) exchanges heat between the refrigerant therein and indoor air conveyed by the indoor fan (32).

The drain pan (35) is arranged on the lower front side and the lower rear side of the indoor heat exchanger (34). The drain pan (35) receives condensed water generated inside the indoor casing (31) of the air conditioning indoor unit (30). Condensed water generated on the surface of the fins of the indoor heat exchanger (34) flows down due to its own weight along the surface and is received by the drain pan (35).

The wind direction adjusting section (36) adjusts the direction of the air blown out from the indoor outlet (31b). The wind direction adjusting part (36) has a flap (37). The flap (37) is shaped like a long plate extending along the longitudinal direction of the indoor outlet (31b). The flap (37) is rotated by being driven by a motor. The flap (37) opens and closes the indoor outlet (31b) as it rotates.

The flap (37) is configured so that the tilt angle can be changed stepwise. The positions to which the flap (37) in this example is adjusted include six positions. These six positions include a closed position and five open positions. The five open positions include the generally horizontal blow position shown in FIG. The flap (37) in the closed position substantially closes the indoor outlet (31b). A gap may be formed between the flap (37) in the closed position and the indoor outlet (31b).

The air conditioning indoor unit (30) is provided with an indoor opening (29). The indoor opening (29) is located between the air filter (33) and the indoor heat exchanger (34) in the interior space of the indoor casing (31).

(2-4) Remote Controller The remote controller (40) is placed indoors at a position where the user can operate it. The remote controller (40) has a display section (41) and an input section (42). The display (41) displays predetermined information. The display section (41) is composed of, for example, a liquid crystal monitor. The predetermined information is information indicating the operating state, set temperature, and the like of the air conditioning system (1). An input unit (42) receives an input operation for performing various settings from a user. The input section (42) is composed of, for example, a plurality of physical switches. The user can set the operation mode, target temperature, target humidity, etc. of the air conditioning system (1) by operating the input section (42) of the remote controller (40).

(2-5) Sensors As shown in FIG. 2, the air conditioning system (1) has a plurality of sensors. The plurality of sensors includes a sensor for refrigerant and a sensor for air. The refrigerant sensor includes a sensor that detects the temperature and pressure of the high-pressure refrigerant and a sensor that detects the temperature and pressure of the low-pressure refrigerant (not shown).

The air sensors include an outside air temperature sensor (51), an outside air humidity sensor (52), an inside air temperature sensor (53), and an inside air humidity sensor (54). The outside air temperature sensor (51) is provided in the air conditioning outdoor unit (10). The outdoor air temperature sensor (51) detects the temperature of outdoor air. The outside air humidity sensor (52) is provided in the humidification unit (20). The outside air humidity sensor (52) detects the humidity of the outside air. The outdoor air humidity sensor (52) of this example detects the relative humidity of the outdoor air, but may also detect the absolute humidity. The inside air temperature sensor (53) and the inside air humidity sensor (54) are provided in the air conditioning indoor unit (30). The inside air temperature sensor (53) detects the temperature of the inside air. A room air humidity sensor (54) detects the humidity of the room air. The room air humidity sensor (54) detects the relative humidity of the room air, but may also detect the absolute humidity.

(2-6) Controller The air conditioning system (1) has a controller (C). The controller (C) is a controller that controls the operation of the refrigerant circuit (R). The controller (C) controls the operation of the air conditioning outdoor unit (10), the humidifying unit (20), and the air conditioning indoor unit (30).
As shown in FIG. 4, the controller (C) includes an outdoor controller (OC) and an indoor controller (IC). The outdoor controller (OC) is provided in the air conditioner outdoor unit (10). An indoor controller (IC) is provided in the air conditioner indoor unit (30). Each of the indoor controller (IC) and the outdoor controller (OC) includes an MCU (Micro Control Unit), an electric circuit, and an electronic circuit. The MCU includes a CPU (Central Processing Unit), a memory, and a communication interface. Various programs for the CPU to execute are stored in the memory.

The outdoor temperature sensor (51) detection value and the outdoor air humidity sensor (52) detection value are input to the outdoor control unit (OC).

The outdoor control unit (OC) is connected to the compressor (12), outdoor fan (13), expansion valve (15) and four-way switching valve (16). The outdoor control unit (OC) sends control signals for executing and stopping the operation of the air conditioning outdoor unit (10) to the compressor (12), the outdoor fan (13), the expansion valve (15), and the four-way switching valve. Output to (16). The outdoor control unit (OC) controls the operating frequency of the first motor (M1) of the compressor (12), the rotation speed of the second motor (M2) of the outdoor fan (13), the state of the four-way switching valve (16), and the expansion Controls the opening of the valve (15).

The outdoor controller (OC) is further connected to the humidification rotor (22), first fan (23), switching damper (24), heater (25), and second fan (26). The outdoor control section (OC) sends control signals for executing and stopping the operation of the humidification unit (20) to the humidification rotor (22), the first fan (23), the switching damper (24), the second fan ( 26), and output to the heater (25). The outdoor controller (OC) controls the number of rotations of the fourth motor (M4) of the first fan (23) and the sixth motor (M6) of the second fan (26), the humidification rotor (22) and the switching damper (24 ) and the output of the heater (25).

The detection value of the inside air temperature sensor (53) and the detection value of the inside air humidity sensor (54) are input to the indoor control unit (IC).

The indoor control unit (IC) is communicably connected to the remote controller (40). The indoor controller (IC) is connected to the indoor fan (32). The indoor controller (IC) outputs a control signal to the indoor fan (32) to start and stop the operation of the air conditioning indoor unit (30). The indoor controller (IC) controls the rotation speed of the seventh motor (M7) of the indoor fan (32). The indoor controller (IC) is communicably connected to the outdoor controller (OC).

The remote controller (40) is communicably connected to the indoor control unit (IC). The remote controller (40) transmits an instruction signal instructing the operation of the air conditioning system (1) to the indoor controller (IC) according to the user's operation on the input section (42). Upon receiving an instruction signal from the remote controller (40), the indoor controller (IC) transmits the instruction signal to the outdoor controller (OC). The indoor controller (IC) controls the operation of each device of the air conditioning indoor unit (30) according to the instruction signal. When the outdoor controller (OC) receives an instruction signal from the indoor controller (IC), it controls the operation of each of the air conditioning outdoor unit (10) and the humidifying unit (20).

(3) Operation Operation The operation modes executed by the air conditioning system (1) include cooling operation, heating operation, humidification operation, air supply operation, and exhaust operation. The controller (C) executes these operations based on instruction signals from the remote controller (40).

(3-1) Cooling operation Cooling operation is an operation in which indoor air is cooled by the indoor heat exchanger (34) as an evaporator. The set temperature for the cooling operation is instructed from the remote controller (40) at the start of the cooling operation or during the cooling operation. In cooling operation, the controller (C) operates the compressor (12), the outdoor fan (13), and the indoor fan (32). The controller (C) sets the four-way switching valve (16) to the first state. The control section (C) appropriately adjusts the degree of opening of the expansion valve (15). In cooling operation, a first refrigeration cycle is performed in which refrigerant compressed by the compressor (12) radiates heat in the outdoor heat exchanger (14) and evaporates in the indoor heat exchanger (34).

In cooling operation, the controller (C) adjusts the target evaporating temperature of the indoor heat exchanger (34) so that the room temperature detected by the inside air temperature sensor (53) converges to the set temperature. The control section (C) controls the rotation speed of the compressor (12) such that the evaporation temperature of the refrigerant in the indoor heat exchanger (34) converges to the target evaporation temperature. In the cooling operation, the air conveyed by the indoor fan (32) is cooled as it passes through the indoor heat exchanger (34). The air cooled by the indoor heat exchanger (34) is supplied to the indoor space (I) from the indoor outlet (31b) of the air conditioning indoor unit (30).

(3-2) Heating operation The heating operation is an operation in which the indoor air is heated by the indoor heat exchanger (34) as a radiator. The set temperature for the heating operation is instructed from the remote controller (40) at the start of the heating operation or during the heating operation. In heating operation, the controller (C) operates the compressor (12), the outdoor fan (13), and the indoor fan (32). The controller (C) sets the four-way switching valve (16) to the second state. The control section (C) appropriately adjusts the degree of opening of the expansion valve (15). In the heating operation, a second refrigeration cycle is performed in which refrigerant compressed by the compressor (12) releases heat in the indoor heat exchanger (34) and evaporates in the outdoor heat exchanger (14).

In heating operation, the controller (C) adjusts the target condensing temperature of the indoor heat exchanger (34) so that the indoor temperature detected by the indoor air temperature sensor (53) converges to the set temperature. The control section (C) controls the rotation speed of the compressor (12) such that the condensation temperature of the refrigerant in the indoor heat exchanger (34) converges to the target condensation temperature. In the heating operation, the air conveyed by the indoor fan (32) is heated as it passes through the indoor heat exchanger (34). The air heated by the indoor heat exchanger (34) is supplied to the indoor space (I) from the indoor outlet (31b) of the air conditioning indoor unit (30).

(3-3) Humidification operation Humidification operation is an operation of humidifying indoor air by the humidification unit (20). In the humidification operation, outdoor air is sent to the air conditioner indoor unit (30) through the hose (2), as indicated by the solid arrow in FIG. In the humidification operation, the control section (C) operates the heater (25), the humidification rotor (22) and the first fan (23). A control part (C) operates a 2nd fan (26). The control section (C) sets the switching damper (24) to the first state.

In the humidification operation, the outdoor air conveyed by the first fan (23) passes through the moisture absorption area (22A) of the humidification rotor (22), and moisture contained in the outdoor air passes through the moisture absorption area (22A) of the humidification rotor (22). 22A). The portion of the humidification rotor (22) that has adsorbed moisture as the moisture absorption area (22A) moves to the second passageway (28) as the humidification rotor (22) rotates to form a moisture release area (22B). Outdoor air heated by the heater (25) passes through the moisture release area (22B) of the humidification rotor (22), and moisture is desorbed from the humidification rotor (22) to the heated air. In the humidification operation, high-humidity air added with moisture by the humidification rotor (22) is sent to the air conditioner indoor unit (30) through the hose (2), and is then discharged from the air outlet (31b) of the air conditioner indoor unit (30). It is supplied to the indoor space (I). Note that the humidification operation may be performed simultaneously with the heating operation.

(3-4) Air supply operation The air supply operation is an operation for supplying outdoor air to a room. In the air supply operation, outdoor air is sent to the air conditioner indoor unit (30) through the hose (2), as indicated by the solid arrow in FIG. In the air supply operation, the controller (C) stops the heater (25), the humidification rotor (22), and the first fan (23) and operates the second fan (26). The control section (C) sets the switching damper (24) to the first state. In the air supply operation, outdoor air conveyed by the second fan (26) flows through the hose (2), flows into the internal space of the air conditioning indoor unit (30) through the indoor opening (29), and enters the air conditioning indoor unit. The air is supplied to the indoor space (I) from the indoor outlet (31b) of (30). The air supply operation may be performed simultaneously with the cooling operation or the heating operation.

(3-5) Exhaust operation The exhaust operation is an operation in which indoor air is discharged to the outside. In the exhaust operation, room air is sent to the humidification unit (20) through the hose (2), as indicated by the dashed arrow in FIG. In the exhaust operation, the controller (C) stops the heater (25), the humidification rotor (22), and the first fan (23) and operates the second fan (26). The control section (C) sets the switching damper (24) to the second state. In the exhaust operation, the indoor air in the indoor space (I) flows through the indoor suction port (31a) into the internal space of the air conditioning indoor unit (30), and flows into the hose (2) through the indoor opening (29). It is then sent to the humidification unit (20), sucked by the second fan (26), and discharged to the outside through the intake/exhaust port (21c). Note that the exhaust operation may be performed simultaneously with the cooling operation or the heating operation.

(4) Purification Mode The air conditioning system (1) executes the purification mode. The cleaning mode is an operation mode for cleaning the indoor heat exchanger (34).

As shown in FIG. 5, in the purification mode, purification operation, drying operation, and exhaust operation are performed in order. The control unit (C) controls components of the air conditioning system (1) so that these operations are performed.

(4-1) Purification Operation In the purification operation, a humidification step and a condensation step are performed in order.

In the humidification step, the air conditioning system (1) performs humidification operation. As described above, in the humidification operation, the air (outdoor air) humidified in the humidification unit (20) is supplied to the indoor space (I) through the hose (2). As a result, the humidity in the indoor space (I) increases. Note that the indoor fan (32) operates in the humidification step.

The condensation step is a condensation operation that condenses water vapor in the air in the indoor heat exchanger (34). In the condensation step, the air conditioning system (1) performs the same operation as cooling operation, and the indoor heat exchanger (34) functions as an evaporator. In the indoor heat exchanger (34), indoor air is cooled by refrigerant. At that time, water vapor contained in the indoor air condenses and adheres to the indoor heat exchanger (34).

In the purification operation, the air conditioning system (1) performs the humidification step in advance to increase the humidity of the indoor space (I), and then performs the dew condensation step. Therefore, in the dew condensation step, a relatively large amount of condensed water is produced on the surface of the indoor heat exchanger (34) in a relatively short period of time. Water condensed on the surface of the indoor heat exchanger (34) flows downward due to gravity. At this time, the condensed water flows downward together with dust adhering to the indoor heat exchanger (34). As a result, dust and the like are removed from the indoor heat exchanger (34), and the indoor heat exchanger (34) becomes clean.

(4-2) Drying operation Drying operation is an operation for evaporating water remaining in the indoor heat exchanger (34) after the purification operation is completed. In the dry operation, the indoor fan (32) operates and the compressor (12) stops. In dry operation, indoor air passes through the indoor heat exchanger (34). The water remaining in the indoor heat exchanger (34) evaporates and is discharged into the indoor space (I) together with the indoor air.

(4-3) Exhaust operation The air conditioning system (1) performs the exhaust operation described above after finishing the drying operation. The exhaust operation executed in the purification mode is performed to exhaust the moisture that has flowed into the indoor space due to the drying operation to the outside.

At the time of starting the exhaust operation, there is relatively high-humidity air blown out from the air conditioning indoor unit (30) during the drying operation near the air conditioning indoor unit (30). In the exhaust operation, relatively high-humidity air existing near the air conditioning indoor unit (30) passes through the indoor suction port (31a) of the air conditioning indoor unit (30), the indoor side opening (29), and the hose (2). and into the humidification unit (20), and is discharged out of the room through the air intake/exhaust port (21c) of the humidification unit (20).

(5) Features of Embodiment 1 (5-1)
In the air conditioning system (1) of the present embodiment, the control section (C) causes the humidification unit (20), which is a ventilator, to perform the exhaust operation after the purification operation is finished. The humidification unit (20) draws in the air around the indoor heat exchanger (34), which has become highly humid due to the purification operation, from inside the indoor unit (30) and discharges it to the outside. As a result, an increase in humidity in the indoor space (I) is suppressed, and comfort in the indoor space (I) is maintained.

(5-2)
In the air conditioning system (1) of the present embodiment, the humidification unit (20), which is a ventilator, performs an exhaust operation after the dew condensation step (condensation operation) of the purification operation is completed. During execution of the dew condensation step, the humidification unit (20) does not perform exhaust operation. Therefore, during the dew condensation step, air containing a certain amount of moisture remains around the indoor heat exchanger (34) without being discharged to the outside. As a result, the amount of condensed water produced in the condensation step can be ensured, and the condensed water can be used to purify the indoor heat exchanger (34).

(5-3)
In the purification mode of the air conditioning system (1) of the present embodiment, the humidifying unit (20), which is a ventilator, performs an exhaust operation after completing the drying operation. During the drying operation, water adhering to the indoor heat exchanger (34) evaporates, and the air around the indoor heat exchanger (34) becomes highly humid. The air around the indoor heat exchanger (34), which has become highly humid due to the dry operation, is discharged to the outside by the ventilator (20, 60). As a result, an increase in humidity in the indoor space (I) is suppressed, and comfort in the indoor space (I) is maintained.

(6) Modification of Embodiment 1 In the purification mode, the air conditioning system (1) may perform the exhaust operation and the drying operation concurrently. Further, in the purification mode, the air conditioning system (1) may skip the drying operation and perform the exhaust operation.

Also in this modification, the air around the indoor heat exchanger (34) that has become highly humid due to the purification operation is discharged to the outside by the ventilator (20, 60). As a result, an increase in humidity in the indoor space (I) is suppressed, and comfort in the indoor space (I) is maintained.

<<Embodiment 2>>
The air conditioning system (1) of Embodiment 2 will be described.

The air conditioning system (1) of this embodiment is the air conditioning system (1) of Embodiment 1 with a different purification mode. Here, the purification mode performed by the air conditioning system (1) of the present embodiment will be described.

(1) Purification Mode As shown in FIG. 6, in the purification mode of the present embodiment, purification operation, drying operation, and exhaust operation are performed in order. This point is the same as the purification mode of the first embodiment. In the purification mode of this embodiment, the purification operation differs from that of the first embodiment. The drying operation and exhaust operation performed in the purification mode of this embodiment are the same as the drying operation and exhaust operation performed in the purification mode of the first embodiment, respectively.

(1-1) Purification Operation In the purification operation, a freezing step and a thawing step are performed in order.

The freezing step is performed to frost the indoor heat exchanger (34). In the freezing step, the air conditioning system (1) performs the same operation as cooling operation, and the indoor heat exchanger (34) functions as an evaporator. However, in the freezing step, the evaporation temperature of the refrigerant in the indoor heat exchanger (34) is set below 0°C (eg -10°C). In the freezing step, moisture in the indoor air turns into frost and adheres to the indoor heat exchanger (34).

Here, the triple point pressure of water (=0.6 kPa) is lower than the atmospheric pressure (101.3 kPa). The pressure of the indoor space (I) in which the air conditioning indoor unit (30) is installed is the atmospheric pressure. Therefore, the water vapor in the indoor air passing through the indoor heat exchanger (34) condenses into a liquid and then solidifies into a solid (frost). Therefore, the freezing step is a condensation operation that condenses water vapor in the air in the indoor heat exchanger (34).

The melting step is performed to melt frost adhering to the indoor heat exchanger (34). In the thawing step, the air conditioning system (1) performs the same operation as heating operation, and the indoor heat exchanger (34) functions as a condenser. Frost adhering to the indoor heat exchanger (34) is heated by the refrigerant, melts, becomes water (liquid), and flows downward.

In the purification operation, the air conditioning system (1) performs a freezing step to deposit a relatively large amount of frost on the indoor heat exchanger (34), and then performs a melting step. Therefore, in the melting step, a relatively large amount of water (liquid) is produced in a relatively short period of time by melting the frost adhered to the indoor heat exchanger (34). Water (liquid) produced by the melting of frost flows downward due to gravity. At this time, the water (liquid) flows downward together with dust and the like adhering to the indoor heat exchanger (34). As a result, dust and the like are removed from the indoor heat exchanger (34), and the indoor heat exchanger (34) becomes clean.

(2) Features of Embodiment 2 In the air conditioning system (1) of the present embodiment, the control section (C) causes the humidification unit (20), which is a ventilator, to perform the exhaust operation after the purification operation ends. Therefore, according to the air conditioning system (1) of the present embodiment, similarly to the air conditioning system (1) of the first embodiment, the air around the indoor heat exchanger (34) that has become highly humid due to the purification operation is It can be discharged outdoors. As a result, an increase in humidity in the indoor space (I) is suppressed, and comfort in the indoor space (I) can be maintained.

(3) Modification of Embodiment 2 (3-1)
In the purification mode, the air conditioning system (1) may perform the exhaust operation concurrently with the drying operation. Further, in the purification mode, the air conditioning system (1) may skip the drying operation and perform the exhaust operation.

(3-2)
In the purification mode, the air conditioning system (1) may start the exhaust operation after the freezing step and before the thawing step (that is, during the purification operation).

<<Embodiment 3>>
An air conditioning system (1) of Embodiment 3 will be described.

(1) Purification Mode As shown in FIG. 7, in the purification mode of the present embodiment, purification operation, drying operation, and exhaust operation are performed in order. This point is the same as the purification mode of the first embodiment. In the purification mode of this embodiment, the purification operation differs from that of the first embodiment. The drying operation and exhaust operation performed in the purification mode of this embodiment are the same as the drying operation and exhaust operation performed in the purification mode of the first embodiment, respectively.

(1-1) Purification Operation In the purification operation, a condensation step and a heating step are performed in order.

The heating step is performed to heat the condensed water adhering to the indoor heat exchanger. In the heating step, the air conditioning system (1) performs the same operation as the heating operation, and the indoor heat exchanger (34) functions as a condenser. The condensed water adhering to the indoor heat exchanger (34) is heated by the refrigerant.

In the purification operation, the air conditioning system (1) performs a dew condensation step to cause condensed water to adhere to the indoor heat exchanger (34), and then performs a heating step. In the heating step, the condensed water adhering to the indoor heat exchanger (34) is heated to a relatively high temperature (for example, about 60° C.) to kill bacteria, mold spores, etc. present in the condensed water. As a result, the indoor heat exchanger (34) becomes clean.

(2) Features of Embodiment 3 In the air conditioning system (1) of the present embodiment, the control section (C) causes the humidification unit (20), which is a ventilator, to perform the exhaust operation after the purification operation ends. Therefore, according to the air conditioning system of the present embodiment, similarly to the air conditioning system of Embodiment 1, the air around the indoor heat exchanger (34), which has become highly humid due to the purification operation, can be discharged outdoors. can. As a result, an increase in humidity in the indoor space (I) is suppressed, and comfort in the indoor space (I) can be maintained.

(3) Modification of Embodiment 3 (3-1)
In the purification mode, the air conditioning system (1) may perform the exhaust operation concurrently with the drying operation. Further, in the purification mode, the air conditioning system (1) may skip the drying operation and perform the exhaust operation.

(3-2)
In the purification mode, the air conditioning system (1) may start the exhaust operation after the dew condensation step and before the heating step (that is, during the purification operation).

<<Other embodiments>>
In Embodiments 1 to 3 and their respective modifications, the air conditioning system (1) may further comprise an exhaust unit (60).

As shown in FIG. 8, the exhaust unit (60) is formed separately from the air conditioning indoor unit (30), the air conditioning outdoor unit (10), and the humidification unit (20). The exhaust unit (60) is installed in the wall (WL) of the room forming the interior space (I). The exhaust unit (60) is installed relatively close to the air conditioning indoor unit (30). A distance D between the exhaust unit (60) and the air conditioning indoor unit (30) is preferably 1.8 m or less.

The installation location of the exhaust unit (60) is merely an example. The exhaust unit (60) may be installed, for example, on the ceiling. Further, in the air conditioning system (1) of the present embodiment, the humidifying unit (20) and the hose (2) may be omitted.

The exhaust unit (60) includes an exhaust fan (61) and an exhaust casing (62). The exhaust fan (61) is housed in the exhaust casing (62). A ventilation inlet (63) is formed in the exhaust casing (62). The ventilation intake (63) opens into the interior space (I). The ventilation intake (63) is an indoor opening provided outside the air conditioner outdoor unit (10). Although not shown, an exhaust duct is connected to the exhaust casing (62). The exhaust casing (62) communicates with the outdoor space via an exhaust duct. When the exhaust fan (61) operates, indoor air is sucked into the ventilation inlet (63) and discharged to the outdoor space through the exhaust duct.

In the purification mode of the air conditioning system (1) of the present embodiment, the exhaust operation is performed by the exhaust unit (60) instead of the exhaust operation by the humidification unit (20). In the exhaust operation in the purification mode, the exhaust unit (60) discharges to the outdoor space relatively high-humidity air that has flowed out of the air conditioning indoor unit (30) in the dry operation.

Although the embodiments and modifications have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims. In addition, the embodiments and modifications described above may be appropriately combined or replaced as long as the functions of the object of the present disclosure are not impaired. In addition, the descriptions of "first", "second", "third", etc. in the specification and claims are used to distinguish words and phrases to which these descriptions are given, and the words and phrases Neither the number nor the order is limited.

As described above, the present disclosure is useful for air conditioning systems.

1 Air conditioning system 10 Air conditioning outdoor unit (outdoor unit)
20 Humidification unit (ventilator)
29 Indoor opening 30 Air conditioning indoor unit (indoor unit)
34 Indoor heat exchanger 60 Exhaust unit (ventilator)
63 Ventilation intake (indoor side opening)
C control section

Claims

an outdoor unit (10);
an indoor unit (30) having an indoor heat exchanger (34) for heat-exchanging indoor air with a refrigerant;
An air conditioning system (1) comprising a ventilator (20, 60) for ventilating an indoor space in which the indoor unit (30) is installed,
The ventilator (20, 60) is capable of performing an exhaust operation in which the air inside the indoor unit (30) or the air flowing out from the indoor unit (30) is sucked in and discharged to the outside,
The indoor unit (30) is capable of executing a purification operation for purifying the indoor heat exchanger (34) using water condensed in the indoor heat exchanger (34),
An air conditioning system comprising a control section (C) for causing the ventilator (20, 60) to perform the exhaust operation during or after the purification operation.
In the air conditioning system (1) according to claim 1,
The air conditioning system, wherein the control unit (C) causes the ventilator (20, 60) to perform the exhaust operation after the purification operation is finished.
In the air conditioning system (1) according to claim 1,
The purification operation of the indoor unit (30) includes a condensation operation of condensing water vapor in the air in the indoor heat exchanger (34),
The air conditioning system, wherein the controller (C) causes the ventilator (20, 60) to perform the exhaust operation after the condensing operation is completed.
In the air conditioning system (1) according to claim 1,
The indoor unit (30) is capable of executing a drying operation for drying the indoor heat exchanger (34) after the purification operation is finished,
The control unit (C) controls the ventilator (20, 60) to perform the exhaust operation during or after the drying operation.
In the air conditioning system (1) according to any one of claims 1 to 4,
The indoor unit (30) has an indoor opening (29) provided inside the indoor unit (30) and connected to the ventilator (20, 60),
The ventilator (20, 60) is an air conditioning system that sucks air inside the indoor unit (30) through the indoor opening (29) and discharges it to the outside in the exhaust operation.
In the air conditioning system (1) according to any one of claims 1 to 4,
The ventilator (20, 60) has an indoor-side opening (63) provided outside the indoor unit (30), and ventilates the air flowing out of the indoor unit (30) in the exhaust operation to the indoor-side opening (63). An air conditioning system that draws in air through an opening (63) and discharges it to the outside.