JP2023126731A - Air-conditioning system - Google Patents

Abstract

To suppress the degradation of comfort in an indoor space due to operation, in an air-conditioning system performing operation for purifying a heat exchanger by using condensed water in the heat exchanger.SOLUTION: An air-conditioning system is equipped with an outdoor unit, an indoor unit, a ventilation device, and a control portion. The ventilation device can execute exhaust operation sucking indoor air and discharging it to the outside. The indoor unit can execute purifying operation purifying an indoor heat exchanger by using condensed water in the indoor heat exchanger. The control portion makes the ventilation device to execute the exhaust operation after the completion of the purifying operation.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD This disclosure relates to air conditioning systems.

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

Japanese Patent Application Publication No. 2018-141597

When the heat exchanger is operated to purify the heat exchanger using condensed water, the air near the heat exchanger becomes highly humid. If this highly humid air flows out into the indoor space and spreads, there is a risk that indoor comfort will be impaired.

An object of the present disclosure is to suppress a decrease in indoor space comfort caused by an operation that uses condensed water in a heat exchanger to purify the heat exchanger.

A first aspect of the present disclosure includes an indoor unit (30) having an outdoor unit (10), an indoor heat exchanger (34) that exchanges heat between indoor air and a refrigerant, and an indoor unit (30) in which the indoor unit (30) is installed. An air conditioning system (1) equipped with a ventilation device (20, 60) that ventilates an indoor space, wherein the ventilation device (20, 60) ventilates the air inside the indoor unit (30) or the indoor space. The indoor unit (30) can perform an exhaust operation that sucks air flowing out from the unit (30) and discharges it outdoors, and the indoor unit (30) generates indoor heat by using water condensed in the indoor heat exchanger (34). The control unit (C) is capable of executing a purification operation for purifying the exchanger (34), and causes the ventilator (20, 60) to execute the exhaust operation during or after the purification operation.

In the first aspect, the control unit (C) causes the ventilation device (20, 60) to perform the exhaust operation during or after the purification operation. The ventilation system (20,60) sucks 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 ventilation system (20,60) exhausts the high-humidity air it draws in to the outside. As a result, the comfort of the indoor space is maintained.

A second aspect of the present disclosure is that in the air conditioning system (1) of the first aspect, the control unit (C) causes the ventilation device (20, 60) to perform the exhaust operation after the purification operation is completed. Execute.

In the second embodiment, the ventilation device (20, 60) performs an exhaust operation after the purification operation ends, and discharges the air that has become highly humid during the purification operation to the outside.

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

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

A fourth aspect of the present disclosure is that in the air conditioning system (1) of the first aspect, the indoor unit (30) operates in a drying operation in which the indoor heat exchanger (34) is dried after the purification operation is completed. The control unit (C) causes the ventilation device (20, 60) to perform the exhaust operation during or after the drying operation.

In the fourth aspect, the ventilation device (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 drying operation, is exhausted outside by the ventilation device (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). It has an indoor opening (29) connected to the ventilation device (20, 60), and the ventilation device (20, 60) directs the air inside the indoor unit (30) to the indoor side during the exhaust operation. It is sucked in through the opening (29) and discharged outside.

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

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 ventilation device (20, 60) is provided outside the indoor unit (30). The indoor unit has an indoor opening (63), and the air flowing out from the indoor unit (30) during the exhaust operation is sucked in through the indoor opening (63) and discharged to the outside.

In the sixth aspect, the ventilation device (20, 60) in exhaust operation sucks air flowing out from the indoor unit (30) through the indoor opening (63) and discharges it to the outdoors.

FIG. 1 is a diagram showing the configuration of an air conditioning system according to the first embodiment. FIG. 2 is a diagram showing a refrigerant circuit and an air distribution path of the air conditioning system according to the first embodiment. 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 according to the first embodiment. FIG. 5 is a block diagram showing a purification mode performed by the air conditioning system of the first embodiment. FIG. 6 is a block diagram showing a purification mode performed by the air conditioning system of the second embodiment. FIG. 7 is a block diagram showing a purification mode performed by the air conditioning system of Embodiment 3. FIG. 8 is a diagram showing the configuration of an air conditioning system according to another embodiment.

Embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various changes can be made without departing from the technical idea of the present disclosure. Each drawing is for conceptually explaining the present disclosure, so dimensions, ratios, or numbers may be exaggerated or simplified as necessary to facilitate understanding.

《Embodiment 1》
The air conditioning system (1) of Embodiment 1 will be described.

(1) Overview of the configuration of the air conditioning system The air conditioning system (1) adjusts the temperature and humidity of the air in the target space. The target space in this example is an indoor space (I). As shown in FIG. 1, the air conditioning system (1) includes 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). The air conditioning system (1) has a humidification unit (20). The air conditioning system (1) has a function of humidifying the air. The air conditioning system (1) further has the function of ventilating the indoor space (I).

As shown in FIGS. 1 and 2, the air conditioning system (1) includes a hose (2), a liquid communication pipe (3), and a gas communication pipe (4). The air conditioning indoor unit (30) and the humidification unit (20) are connected to each other via a 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). This constitutes a refrigerant circuit (R). 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 includes 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 a first refrigeration cycle and a second refrigeration cycle in response to switching of the four-way switching valve (16). The first refrigeration cycle is a refrigeration cycle in which the indoor heat exchanger (34) functions as an evaporator and the outdoor heat exchanger (14) functions as a radiator. The second refrigeration cycle is a refrigeration 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 Figures 2 and 4, the air conditioner outdoor unit (10) consists of 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). An outdoor suction port (11a) and an outdoor air outlet (11b) are formed in the outdoor casing (11). The outdoor suction port (11a) is formed on the rear side of the outdoor casing (11). The outdoor suction port (11a) is an opening for sucking outdoor air. The outdoor air outlet (11b) is formed on the front side of the outdoor casing (11). The outdoor air outlet (11b) is an opening for blowing out the 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 air outlet (11b).

The compressor (12) sucks in and compresses low-pressure gas refrigerant. The compressor (12) is driven by a first motor (M1). The compressor (12) is a variable capacity compressor to which power is supplied from the 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 (rotation 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 the drive of the second motor (M2). Air conveyed by the outdoor fan (13) is sucked into the outdoor casing (11) from the outdoor suction port (11a). This air flows through the outdoor air passageway (11c) and is blown out from the outdoor outlet (11b) to the outside of the outdoor casing (11). 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 passageway (11c). The outdoor heat exchanger (14) of this example is a fin-and-tube type 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 pressure reduction mechanism. The expansion valve (15) reduces the pressure of the refrigerant. The expansion valve (15) is an electrically operated expansion valve whose opening degree can be adjusted. The pressure reduction mechanism may be a temperature-sensitive expansion valve, an expander, a capillary tube, or the like. The expansion valve (15) only needs to 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 flow path 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 section of the compressor (12). The second port (P2) is connected to the suction part 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 (the state shown by the solid line in FIG. 2) and a second state (the state shown by the broken line in FIG. 2). The four-way switching valve (16) in the first state allows the first port (P1) and the third port (P3) to communicate with each other, and also allows the second port (P2) and the fourth port (P4) to communicate with each other. The four-way switching valve (16) in the second state allows the first port (P1) and the fourth port (P4) to communicate with each other, and also allows the second port (P2) and the third port (P3) to communicate with each other.

(2-2) Humidifying unit The humidifying unit (20) has a function of humidifying the air. Moreover, the humidification unit (20) 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 humidifying 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 humidifying unit (20) includes a humidifying casing (21), a humidifying 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) accommodates 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 inlet (21a), a humidification exhaust port (21b), and an intake and exhaust port (21c). The humidification suction port (21a) and the intake/exhaust port (21c) are formed on the rear side of the humidification casing (21). The humidification exhaust port (21b) is formed on the front side of the humidification casing (21).

The humidification inlet (21a) is an opening for sucking in outdoor air. The humidifying exhaust port (21b) is an opening for discharging air after adding moisture to the humidifying rotor (22). The intake/exhaust port (21c) is an opening for sucking in outdoor air or discharging air sent from indoors. A first passage (27) is formed inside the humidification casing (21), which extends from the humidification inlet (21a) to the humidification exhaust outlet (21b). A second passageway (28) is formed inside the humidifying casing (21), which extends from the air intake and exhaust port (21c) to the connection port (21d). 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 described later, the indoor opening (29) is arranged inside the air conditioning indoor unit (30). The indoor opening (29) is connected to the humidification unit (20).

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

The humidification rotor (22) is rotated by 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 into the air. The moisture absorption area (22A) is constituted by a portion of the humidification rotor (22) located in the first passage (27). The moisture release area (22B) is constituted by a portion of the humidification rotor (22) located in the second passageway (28).

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

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

The heater (25) is arranged in the second passageway (28) between the intake and exhaust port (21c) and the switching damper (24). The heater (25) heats the air flowing through the second passage (28). The heater (25) is configured to have variable output. The temperature of the air passing through the heater (25) changes depending on the output of the heater (25).

The second fan (26) is arranged between the first inlet/outlet (24a) and the second inlet/outlet (24b) of the switching damper (24). The second fan (26) is rotated by the sixth motor (M6). The second fan (26) is configured to be able to switch the air volume to multiple levels by adjusting the rotation speed of the sixth motor (M6). The flow of air conveyed by the second fan (26) changes depending on the state of the switching damper (24). Specifically, when the switching damper (24) is in the first state, air sucked in from the first inlet/outlet (24a) flows out to the second inlet/outlet (24b), as shown by the solid arrow in FIG. When the switching damper (24) is in the second state, air sucked in from the second entrance/exit (24b) flows out to the first entrance/exit (24a), as shown by the broken line arrow in FIG.

(2-3) Air conditioning indoor unit As shown in Figures 1 to 3, the air conditioning indoor unit (30) is installed indoors. The air conditioning indoor unit (30) is a wall-mounted type installed on the wall (WL) of the room forming 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 adjustment unit (36). and has.

The indoor casing (31) houses an indoor fan (32), an air filter (33), an indoor heat exchanger (34), and a drain pan (35). An indoor suction port (31a) and an indoor air outlet (31b) are formed in the indoor casing (31). The indoor suction port (31a) is arranged above the indoor casing (31). The indoor suction port (31a) is an opening for sucking indoor air. The indoor air 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 humidifying air. Inside the indoor casing (31), an indoor air passageway (31c) is provided that continues from the indoor suction port (31a) to the indoor air outlet (31b).

The indoor fan (32) is arranged approximately at the center of the indoor air passageway (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 the seventh motor (M7). The indoor fan (32) takes indoor air into the indoor air passageway (31c) and conveys it. Air conveyed by the indoor fan (32) is sucked into the indoor casing (31) from the indoor suction port (31a). This air flows through the indoor air passage (31c) and is blown out from the indoor air outlet (31b) to the outside of the indoor casing (31).

The indoor fan (32) transports indoor air so that it passes 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 to be able to switch the air volume to multiple levels 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 passageway (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 therethrough. The air filter (33) collects dust in the air sucked in from the indoor suction port (31a).

The indoor heat exchanger (34) is arranged upstream of the indoor fan (32) in the indoor air passageway (31c). The indoor heat exchanger (34) of this example is a fin-and-tube type 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 the indoor air conveyed by the indoor fan (32).

The drain pan (35) is arranged at the front lower side and the rear lower 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). The condensed water generated on the surface of the fins of the indoor heat exchanger (34) flows down the surface due to its own weight and is received by the drain pan (35).

The wind direction adjustment section (36) adjusts the direction of air blown out from the indoor air outlet (31b). The wind direction adjustment section (36) has a flap (37). The flap (37) is formed in a long plate shape extending along the longitudinal direction of the indoor air outlet (31b). The flap (37) is rotated by the drive of the motor. The flap (37) opens and closes the indoor air outlet (31b) as it rotates.

The flap (37) is configured so that its inclination angle can be changed in stages. The positions at 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 substantially horizontal blowout position shown in FIG. The flap (37) in the closed position substantially closes the indoor air outlet (31b). A gap may be formed between the flap (37) in the closed position and the indoor air outlet (31b).

The air conditioning indoor unit (30) is provided with an indoor opening (29). The indoor opening (29) is installed between the air filter (33) and the indoor heat exchanger (34) in the internal 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 section (41) displays predetermined information. The display section (41) is configured by, for example, a liquid crystal monitor. The predetermined information is information indicating the operating state, set temperature, etc. of the air conditioning system (1). The input unit (42) receives input operations for various settings from the user. The input section (42) is composed of, for example, a plurality of physical switches. The user can set the operating mode, target temperature, target humidity, etc. of the air conditioning system (1) by operating the input unit (42) of the remote controller (40).

(2-5) Sensors As shown in FIG. 2, the air conditioning system (1) has multiple sensors. The plurality of sensors include a refrigerant sensor and an air sensor. The refrigerant sensors include a sensor that detects the temperature and pressure of high-pressure refrigerant and a sensor that detects the temperature and pressure of 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 conditioner outdoor unit (10). The outside air temperature sensor (51) detects the temperature of the outside air. The outside air humidity sensor (52) is provided in the humidification unit (20). The outdoor air humidity sensor (52) detects the humidity of outdoor air. The outdoor air humidity sensor (52) of this example detects the relative humidity of outdoor air, but may also detect 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 indoor air temperature sensor (53) detects the temperature of indoor air. The indoor air humidity sensor (54) detects the humidity of indoor air. The indoor air humidity sensor (54) detects the relative humidity of indoor air, but may also detect absolute humidity.

(2-6) Control unit The air conditioning system (1) has a control unit (C). The control unit (C) is a controller that controls the operation of the refrigerant circuit (R). The control unit (C) controls the operations of the air conditioning outdoor unit (10), the humidification unit (20), and the air conditioning indoor unit (30). The control unit (C) includes an outdoor control unit (OC) and an indoor control unit (IC). The outdoor control unit (OC) is provided in the air conditioner outdoor unit (10). The indoor control unit (IC) is provided in the air conditioning indoor unit (30). Each of the indoor control unit (IC) and the outdoor control unit (OC) includes an MCU (Micro Control Unit), an electric circuit, and an electronic circuit. The MCU includes a CPU (Central Processing Unit), memory, and a communication interface. The memory stores various programs for the CPU to execute.

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

The outdoor control unit (OC) is connected to a compressor (12), an outdoor fan (13), an expansion valve (15), and a four-way switching valve (16). The outdoor control unit (OC) sends control signals for starting and stopping the operation of the air conditioner outdoor unit (10) to the compressor (12), outdoor fan (13), expansion valve (15), and 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 degree of the valve (15).

The outdoor control unit (OC) is further connected to a humidification rotor (22), a first fan (23), a switching damper (24), a heater (25), and a second fan (26). The outdoor control unit (OC) sends control signals for starting and stopping the operation of the humidifying unit (20) to the humidifying rotor (22), the first fan (23), the switching damper (24), and the second fan ( 26) and output to the heater (25). The outdoor control unit (OC) controls the rotational speed 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 detected value of the indoor air temperature sensor (53) and the detected value of the indoor 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 control unit (IC) is connected to the indoor fan (32). The indoor control unit (IC) outputs a control signal for starting and stopping the operation of the air conditioning indoor unit (30) to the indoor fan (32). The indoor control unit (IC) controls the rotation speed of the seventh motor (M7) of the indoor fan (32). The indoor control unit (IC) is communicably connected to the outdoor control unit (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 control unit (IC) in response to a user's operation on the input unit (42). Upon receiving the instruction signal from the remote controller (40), the indoor control section (IC) transmits the instruction signal to the outdoor control section (OC). The indoor control unit (IC) controls the operation of each of the above-mentioned devices of the air conditioning indoor unit (30) according to the instruction signal. When the outdoor control unit (OC) receives an instruction signal from the indoor control unit (IC), the outdoor control unit (OC) controls the operation of each of the above-mentioned devices of the air conditioning outdoor unit (10) and the humidification unit (20).

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

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

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

(3-2) Heating operation Heating operation is an operation in which indoor air is heated by the indoor heat exchanger (34), which serves 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 the heating operation, the control unit (C) operates the compressor (12), the outdoor fan (13), and the indoor fan (32). The control unit (C) sets the four-way switching valve (16) to the second state. The control unit (C) appropriately adjusts the opening degree of the expansion valve (15). In the heating operation, a second refrigeration cycle is performed in which the refrigerant compressed by the compressor (12) radiates heat in the indoor heat exchanger (34) and evaporates in the outdoor heat exchanger (14).

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

(3-3) Humidification operation The humidification operation is an operation in which the indoor air is humidified by the humidification unit (20). In the humidification operation, outdoor air is sent to the air conditioning indoor unit (30) through the hose (2), as shown by the solid arrow in FIG. In the humidifying operation, the control unit (C) operates the heater (25), the humidifying rotor (22), and the first fan (23). The control unit (C) operates the second fan (26). The control unit (C) sets the switching damper (24) to the first state.

In humidification operation, 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 is transferred to the moisture absorption area (22A) of the humidification rotor (22). 22A). The portion of the humidifying rotor (22) that adsorbs moisture as the moisture absorbing area (22A) moves to the second passage (28) by rotation of the humidifying rotor (22) and forms a moisture releasing 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) into the heated air. During humidification operation, highly humid air to which moisture has been added by the humidification rotor (22) is sent to the air conditioning indoor unit (30) through the hose (2), and from the indoor air outlet (31b) of the air conditioning indoor unit (30). Supplied to the indoor space (I). Note that the humidifying operation may be performed simultaneously with the heating operation.

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

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

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

As shown in FIG. 5, in the purification mode, a purification operation, a drying operation, and an exhaust operation are performed in order. The control unit (C) controls the 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 dew condensation step are performed in order.

In the humidification step, the air conditioning system (1) performs a humidification operation. As described above, in the humidification operation, 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 in the humidification step, the indoor fan (32) operates.

The dew condensation step is a condensation operation in which water vapor in the air is condensed in the indoor heat exchanger (34). In the dew condensation step, the air conditioning system (1) performs the same operation as the cooling operation, and the indoor heat exchanger (34) functions as an evaporator. In the indoor heat exchanger (34), indoor air is cooled by a 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 a humidification step in advance to increase the humidity in the indoor space (I), and then performs a dew condensation step. Therefore, in the dew condensation step, a relatively large amount of condensed water is generated 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 attached 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 The drying operation is an operation for evaporating the water remaining in the indoor heat exchanger (34) after the purification operation is completed. During drying operation, the indoor fan (32) operates and the compressor (12) stops. In the drying 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 above-mentioned exhaust operation after the drying operation is completed. The exhaust operation performed in the purification mode is performed to exhaust moisture that has flowed into the indoor space during the drying operation to the outside.

At the time of starting the exhaust operation, relatively high-humidity air blown out from the air-conditioning indoor unit (30) during the drying operation is present near the air-conditioning indoor unit (30). During exhaust operation, relatively high-humidity air existing near the air conditioning indoor unit (30) is pumped through the indoor suction port (31a) of the air conditioning indoor unit (30), the indoor opening (29), and the hose (2). The air flows into the humidifying unit (20) through the humidifying unit (20), and is discharged outside from the air intake/exhaust port (21c) of the humidifying unit (20).

(5) Features of Embodiment 1 (5-1)
In the air conditioning system (1) of this embodiment, the control unit (C) causes the humidification unit (20), which is a ventilation device, to perform an exhaust operation after the purification operation ends. The humidifying unit (20) sucks 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, the increase in humidity in the indoor space (I) is suppressed, and the comfort of the indoor space (I) is maintained.

(5-2)
In the air conditioning system (1) of this embodiment, the humidifying unit (20), which is a ventilation device, performs the exhaust operation after the dew condensation step (condensation operation) of the purification operation is completed. During execution of the dew condensation step, the humidifying unit (20) does not perform exhaust operation. Therefore, while the dew condensation step is being performed, air containing a certain amount of moisture remains around the indoor heat exchanger (34) without being exhausted to the outside. As a result, the amount of condensed water generated in the condensation step can be secured, and the indoor heat exchanger (34) can be purified using the condensed water.

(5-3)
In the purification mode of the air conditioning system (1) of this embodiment, the humidifying unit (20), which is a ventilation device, performs an exhaust operation after the drying operation ends. 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 drying operation, is exhausted outside by the ventilation device (20, 60). As a result, the increase in humidity in the indoor space (I) is suppressed, and the comfort of 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 in parallel with the drying operation. Further, in the purification mode, the air conditioning system (1) may omit the drying operation and perform the exhaust operation.

Also in this modification, the air around the indoor heat exchanger (34), which has become highly humid due to the drying operation, is exhausted to the outside by the ventilation device (20, 60). As a result, the increase in humidity in the indoor space (I) is suppressed, and the comfort of 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 the present embodiment is the air conditioning system (1) of the first embodiment in which the purification mode is changed. Here, the purification mode performed by the air conditioning system (1) of this embodiment will be described.

(1) Purification Mode As shown in FIG. 6, in the purification mode of this embodiment, a purification operation, a drying operation, and an 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 is different from the purification mode of the first embodiment. The drying operation and exhausting operation performed in the purification mode of this embodiment are the same as the drying operation and exhausting operation performed in the purification mode of Embodiment 1, 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 form frost on the indoor heat exchanger (34). In the freezing step, the air conditioning system (1) performs the same operation as the 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 to less than 0°C (for example, -10°C). In the freezing step, moisture in the indoor air turns into frost and adheres to the indoor heat exchanger (34).

Here, the pressure at the triple point of water (=0.6 kPa) is lower than atmospheric pressure (101.3 kPa). The pressure in the indoor space (I) in which the air conditioning indoor unit (30) is installed is 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 condensing operation in which water vapor in the air is condensed in the indoor heat exchanger (34).

The melting step is performed to melt the frost attached to the indoor heat exchanger (34). In the melting step, the air conditioning system (1) performs the same operation as heating operation, and the indoor heat exchanger (34) functions as a condenser. The frost adhering to the indoor heat exchanger (34) is heated by the refrigerant and melts, turning into water (liquid) and flowing 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 thawing step. Therefore, in the melting step, a relatively large amount of water (liquid) is generated in a relatively short time by melting the frost attached to the indoor heat exchanger (34). Water (liquid) produced by melting frost flows downwards 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 this embodiment, the control unit (C) causes the humidification unit (20), which is a ventilation device, to perform an exhaust operation after the purification operation ends. Therefore, according to the air conditioning system (1) of this embodiment, similarly to the air conditioning system (1) of Embodiment 1, the air around the indoor heat exchanger (34), which has become highly humid due to the purification operation, is Can be discharged outdoors. As a result, the increase in humidity in the indoor space (I) is suppressed, and the comfort of 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 in parallel with the drying operation. Further, in the purification mode, the air conditioning system (1) may omit the drying operation and perform the exhaust operation.

Also in this modification, the air around the indoor heat exchanger (34), which has become highly humid due to the drying operation, is exhausted to the outside by the ventilation device (20, 60). As a result, the increase in humidity in the indoor space (I) is suppressed, and the comfort of the indoor space (I) is maintained.

(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).

Also in this modification, the air around the indoor heat exchanger (34), which has become highly humid due to the drying operation, is exhausted to the outside by the ventilation device (20, 60). As a result, the increase in humidity in the indoor space (I) is suppressed, and the comfort of the indoor space (I) is maintained.

《Embodiment 3》
The air conditioning system (1) of Embodiment 3 will be described.

The air conditioning system (1) of the present embodiment is the air conditioning system (1) of the first embodiment in which the purification mode is changed. Here, the purification mode performed by the air conditioning system (1) of this embodiment will be described.

(1) Purification Mode As shown in FIG. 7, in the purification mode of this embodiment, a purification operation, a drying operation, and an 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 is different from the purification mode of the first embodiment. The drying operation and exhausting operation performed in the purification mode of this embodiment are the same as the drying operation and exhausting operation performed in the purification mode of Embodiment 1, respectively.

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

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

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 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 deposit condensed water on 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 this embodiment, the control unit (C) causes the humidification unit (20), which is a ventilation device, to perform an exhaust operation after the purification operation ends. Therefore, according to the air conditioning system of this embodiment, similarly to the air conditioning system of Embodiment 1, it is possible to discharge the air around the indoor heat exchanger (34) that has become highly humid due to the purification operation to the outside. can. As a result, the increase in humidity in the indoor space (I) is suppressed, and the comfort of 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 in parallel with the drying operation. Further, in the purification mode, the air conditioning system (1) may omit the drying operation and perform the exhaust operation.

Also in this modification, the air around the indoor heat exchanger (34), which has become highly humid due to the drying operation, is exhausted to the outside by the ventilation device (20, 60). As a result, the increase in humidity in the indoor space (I) is suppressed, and the comfort of the indoor space (I) is maintained.

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

Also in this modification, the air around the indoor heat exchanger (34), which has become highly humid due to the drying operation, is exhausted to the outside by the ventilation device (20, 60). As a result, the increase in humidity in the indoor space (I) is suppressed, and the comfort of the indoor space (I) is maintained.

《Other embodiments》
In Embodiments 1 to 3 and their respective modifications, the air conditioning system (1) may further include 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 on the wall (WL) of a room forming the indoor space (I). The exhaust unit (60) is installed relatively close to the air conditioning indoor unit (30). The distance D between the exhaust unit (60) and the air conditioning indoor unit (30) is preferably 1.8 m or less.

Note that the installation location of the exhaust unit (60) is just an example. The exhaust unit (60) may be installed on the ceiling, for example. Moreover, in the air conditioning system (1) of this embodiment, the humidification 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 suction port (63) is formed in the exhaust casing (62). The ventilation inlet (63) opens into the indoor space (I). The ventilation suction port (63) is an indoor opening provided on the outside of 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 suction port (63) and exhausted to the outdoor space through the exhaust duct.

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

Although the embodiments and modifications have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the claims. Furthermore, the above embodiments and modifications may be combined or replaced as appropriate, as long as the functionality of the object of the present disclosure is not impaired. In addition, the descriptions “first,” “second,” “third,” etc. in the specification and claims are used to distinguish between the words and phrases to which these descriptions are attached. There is no limitation on the number or order.

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

1 Air conditioning system
10 Air conditioner outdoor unit (outdoor unit)
20 Humidification unit (ventilation device)
29 Indoor opening
30 Air conditioning indoor unit (indoor unit)
34 Indoor heat exchanger
60 Exhaust unit (ventilation system)
63 Ventilation inlet (indoor opening)
C control section

Claims (6)

outdoor unit (10),
an indoor unit (30) having an indoor heat exchanger (34) that exchanges heat between indoor air and a refrigerant;
An air conditioning system (1) comprising a ventilation device (20, 60) that ventilates an indoor space in which the indoor unit (30) is installed,
The ventilation device (20, 60) is capable of performing an exhaust operation in which air inside the indoor unit (30) or air flowing out from the indoor unit (30) is sucked in and discharged to the outside.
The indoor unit (30) is capable of performing a purification operation that purifies the indoor heat exchanger (34) using water condensed in the indoor heat exchanger (34),
An air conditioning system comprising a control unit (C) that causes the ventilation device (20, 60) to perform the exhaust operation during or after the purification operation. The air conditioning system (1) according to claim 1,
The control unit (C) is an air conditioning system that causes the ventilation device (20, 60) to perform the exhaust operation after the purification operation ends. The air conditioning system (1) according to claim 1,
The purification operation of the indoor unit (30) includes a condensing operation of condensing water vapor in the air in the indoor heat exchanger (34),
The control unit (C) is an air conditioning system that causes the ventilation device (20, 60) to perform the exhaust operation after the condensation operation is completed. 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 completed,
The control unit (C) is an air conditioning system that causes the ventilation device (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 ventilation device (20, 60),
The ventilation device (20, 60) is an air conditioning system that sucks air inside the indoor unit (30) through the indoor opening (29) and discharges it outdoors during the exhaust operation. In the air conditioning system (1) according to any one of claims 1 to 4,
The ventilation device (20, 60) has an indoor opening (63) provided outside the indoor unit (30), and the air flowing out from the indoor unit (30) during the exhaust operation is directed to the indoor side. An air conditioning system that draws air in through an opening (63) and exhausts it outside.