Air Conditioning Equipment

Abstract

To provide an air conditioner capable of suppressing a leaked refrigerant staying in a room.SOLUTION: An air conditioner includes: an indoor heat exchanger (11); an indoor fan (12) capable of performing a blower operation for supplying air for performing heat exchange with a refrigerant flowing inside the indoor heat exchanger (11) with respect to the indoor heat exchanger (11); a ventilation duct (6) which is used at least for one of ventilation operations of exhausting the indoor air to outdoors and supplying the outdoor air to indoors; and an indoor refrigerant sensor (17) for detecting a refrigerant which has leaked indoors. The refrigerant is the refrigerant which has combustibility, and in the case where the indoor refrigerant sensor (17) has detected the leakage of the refrigerant, the blower operation and the ventilation operation can be performed simultaneously.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to an air conditioning apparatus. [Background technology]

[0002] In recent years, with the growing interest in the global environment, refrigerants with low global warming potential (hereinafter referred to as GWP) that do not have a significant impact on the destruction of the ozone layer or global warming have been attracting attention. Some of these refrigerants are flammable, and it is necessary to ensure their safety by preventing ignition.

[0003] For example, Patent Document 1 (JP 2016-166680 A) proposes that in the event of a refrigerant leak in an indoor unit that uses a flammable refrigerant, the indoor fan is driven to agitate the refrigerant and reduce the concentration of the refrigerant. DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0004] If refrigerant leaks from the indoor unit, the leaked refrigerant will continue to be present in the room even if the indoor fan is driven. [Means for solving the problem]

[0005] The air conditioning apparatus according to a first aspect includes an indoor heat exchanger, an indoor blower, a ventilation flow path, and an indoor detection unit. The indoor blower is capable of blowing operation. In blowing operation, the indoor blower supplies air to the indoor heat exchanger for heat exchange with refrigerant flowing inside the indoor heat exchanger. The ventilation flow path is used for at least one of ventilation operations, which exhaust indoor air to the outside or supply outdoor air to the inside. The indoor detection unit detects refrigerant leaked indoors. The refrigerant is a flammable refrigerant. When the indoor detection unit detects a refrigerant leak, it is possible to perform blowing operation and ventilation operation simultaneously.

[0006] In the event of a refrigerant leak, this air conditioning device can simultaneously perform air blowing and ventilation operations to prevent the refrigerant concentration from increasing locally while also preventing the leaked refrigerant from remaining in the room.

[0007] An air conditioner according to a second aspect is the air conditioner of the first aspect, further comprising an outdoor detection unit. The outdoor detection unit detects refrigerant that has leaked outside.

[0008] This air conditioner can detect when a refrigerant leak has occurred outdoors.

[0009] An air conditioning apparatus according to a third aspect is the air conditioning apparatus according to the second aspect, in which the direction of air flow in the ventilation flow path during ventilation operation is switched depending on whether the indoor detection unit detects a refrigerant leak or the outdoor detection unit detects a refrigerant leak.

[0010] This air conditioner can switch between supplying air from the outside to the inside of the room and exhausting air from the inside of the room to the outside of the room, depending on the location of the refrigerant leak.

[0011] An air conditioner according to a fourth aspect is the air conditioner according to the third aspect, wherein, when the outdoor detection unit detects a refrigerant leak, in ventilation operation, indoor air is exhausted to the outside via the ventilation flow path.

[0012] In the event that a refrigerant leak occurs outdoors, this air conditioner can prevent the leaking refrigerant from outdoors from being sent into the room via the ventilation flow path.

[0013] An air conditioning apparatus according to a fifth aspect is the air conditioning apparatus according to any one of the first aspect to the fourth aspect, further comprising a controller. The controller accepts a stop operation to stop the blowing operation or the ventilation operation when the indoor detection unit has not detected a refrigerant leak. The controller does not accept the stop operation while the blowing operation or the ventilation operation is being performed due to the detection of a refrigerant leak.

[0014] This air conditioner can forcibly continue the fan operation and ventilation operation when a refrigerant leak occurs.

[0015] An air conditioner according to a sixth aspect is the air conditioner according to any one of the first aspect to the fifth aspect, wherein the indoor detection unit detects refrigerant leakage while performing air blowing operation.

[0016] This air conditioning device can improve the accuracy of refrigerant leakage detection at the indoor detection unit by creating an air flow around the indoor detection unit, even if a refrigerant leak occurs at a location away from the indoor detection unit.

[0017] An air conditioning apparatus according to a seventh aspect is an air conditioning apparatus according to any one of the first aspect to the sixth aspect, and is capable of performing ventilation operation even when the indoor detection unit does not detect a refrigerant leak.

[0018] This air conditioner can reuse the ventilation flow path that is prepared for ventilation of the room when there is no refrigerant leakage, for ventilation operation when a leak occurs.

[0019] An air conditioner according to an eighth aspect is the air conditioner according to any one of the first to seventh aspects, further comprising a compressor. The compressor is connected to the indoor heat exchanger via a refrigerant pipe. When the indoor detector detects a refrigerant leak, operation of the compressor is stopped.

[0020] This air conditioner can keep the extent of refrigerant leakage to a minimum by stopping the flow of refrigerant in the refrigerant circuit when refrigerant leakage occurs.

[0021] An air conditioning apparatus according to a ninth aspect is the air conditioning apparatus according to any one of the first aspect to the eighth aspect, further comprising a notification unit. The notification unit notifies of a refrigerant leak when the indoor detection unit detects a refrigerant leak.

[0022] This air conditioning apparatus can notify the user that a refrigerant leak has occurred.

[0023] An air conditioning apparatus according to a tenth aspect is an air conditioning apparatus according to any one of the first aspect to the ninth aspect, wherein the flammable refrigerant includes one or more selected from the group consisting of R290, R600, and R600a.

[0024] This air conditioner can reduce the risk of fire even when a flammable refrigerant is used. [Brief description of the drawings]

[0025] [Figure 1] 1 is an external view of an air conditioning apparatus according to one embodiment. [Diagram 2] FIG. 2 is a diagram in which an outline of air flow is added to a system diagram of a refrigerant circuit. [Diagram 3] FIG. 2 is a functional block diagram of the air conditioning apparatus. [Figure 4] 4 is a control flowchart when a refrigerant leaks. [Diagram 5] 13 is a control flowchart for when a refrigerant leaks according to another embodiment A. [Figure 6] 13 is a control flowchart for when a refrigerant leaks according to another embodiment B. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] (1) Overall structure FIG. 1 shows a schematic external view of an air conditioner 1 according to one embodiment of the present disclosure, and FIG. 2 shows a schematic configuration diagram.

[0027] The air conditioner 1 conditions the air in a target space by performing a vapor compression refrigeration cycle, and also ventilates the target space.

[0028] The air conditioning apparatus 1 mainly comprises an outdoor unit 3, an indoor unit 2, a gas side refrigerant connection pipe 4 connecting the outdoor unit 3 and the indoor unit 2, a liquid side refrigerant connection pipe 5, a drain hose 8 and a ventilation duct 6, a remote control 61 as an input device and output device, and a controller 7 that controls the operation of the air conditioning apparatus 1.

[0029] The indoor unit 2 is disposed indoors. The outdoor unit 3 is disposed outdoors. The outdoor unit 3 has an outdoor air conditioning unit 3a and a ventilation unit 3b. The gas side refrigerant connection pipe 4 and the liquid side refrigerant connection pipe 5 connect the indoor unit 2 and the outdoor air conditioning unit 3a of the outdoor unit 3.

[0030] The air conditioner 1 has a refrigerant circuit 10 that performs a vapor compression refrigeration cycle. The refrigerant circuit 10 is configured by connecting an indoor unit 2 and an outdoor unit 3 via a gas side refrigerant connection pipe 4 and a liquid side refrigerant connection pipe 5. The refrigerant circuit 10 is filled with a flammable refrigerant. Examples of the refrigerant include highly flammable refrigerants of classes A3 and B3, flammable refrigerants of classes A2 and B2, and slightly flammable refrigerants of classes A2L and B2L in the ASHRAE Safety Group. More specifically, the refrigerant may be one or more types selected from the group consisting of R290, R600, and R600a. In this embodiment, the refrigerant circuit 10 is filled with a refrigerant having a higher specific gravity than air.

[0031] The ventilation duct 6 connects the indoor unit 2 and the ventilation unit 3b of the outdoor unit 3. The ventilation unit 3b performs ventilation operations including an air supply operation for supplying outdoor air to the room and an exhaust operation for discharging indoor air to the outside.

[0032] The controller 7 controls the components of the air conditioner 1.

[0033] (2) Indoor unit The indoor unit 2 of this embodiment is, for example, a wall-mounted type.

[0034] The indoor unit 2 includes an indoor heat exchanger 11, an indoor fan 12, an indoor casing 20, a drain hose 8, and an indoor control unit 13.

[0035] The indoor heat exchanger 11 includes a heat transfer tube that is folded back multiple times at both ends in the length direction, and a plurality of fins through which the heat transfer tube is inserted, and exchanges heat with air that comes into contact with the heat transfer tube.

[0036] The indoor fan 12 is, for example, a cross-flow fan. The indoor fan 12 is configured in a cylindrical shape, has a large number of blades on its circumferential surface, and generates an airflow in a direction intersecting with the rotation axis. The indoor fan 12 has a fan motor 12a. When the fan motor 12a is driven, the indoor fan 12 draws indoor air into the indoor unit 2 and blows the air that has exchanged heat with the indoor heat exchanger 11 out into the room, generating an airflow.

[0037] The drain hose 8 constitutes a flow path for discharging, to the outdoors, condensation water that has dripped from the indoor heat exchanger 11 in the indoor unit 2. Specifically, the drain hose 8 extends from the lower surface of the indoor casing 20, and extends to an outdoor drainage point.

[0038] The indoor casing 20 houses the indoor heat exchanger 11, the indoor fan 12, and the indoor control unit 13, and is formed with an intake port 18, an exhaust port 19, and a communication opening 14. The intake port 18 draws in indoor air during exhaust operation. The intake port 18 also draws in indoor air during air conditioning operation. The exhaust port 19 blows out the indoor air and the outdoor air into the room.

[0039] The intake port 18 is provided upstream of the indoor heat exchanger 11. A portion of the indoor air introduced from the intake port 18 during exhaust operation is discharged to the outside through the communication opening 14 and the ventilation duct 6 without passing through the indoor heat exchanger 11. The remaining portion of the indoor air introduced from the intake port 18 during exhaust operation exchanges heat with the indoor heat exchanger 11 as it passes through the indoor heat exchanger 11, and is cooled, dehumidified, or heated, and then supplied to the room through the exhaust port 19.

[0040] During air supply operation, indoor air introduced through the intake port 18 passes through the indoor heat exchanger 11 and is cooled, dehumidified, or heated, and then supplied from the outlet port 19 into the room.

[0041] The communication opening 14 is an intake port through which outside air is introduced during intake operation, and an exhaust port through which indoor air is exhausted during exhaust operation. During intake operation, outside air is supplied into the room through the communication opening 14, and during exhaust operation, indoor air is exhausted to the outside through the communication opening 14. The communication opening 14 is a flow path through which the outside air passes during intake operation, and is a flow path through which the indoor air passes during exhaust operation.

[0042] The indoor casing 20 is installed on the wall so that the communication opening 14 faces an opening formed in the wall of the room (not shown). The communication opening 14 and the opening formed in the wall of the room are connected by an air supply and exhaust port member.

[0043] The communication opening 14 is provided upstream of the indoor heat exchanger 11 in the air flow direction formed by the indoor fan 12. Outdoor air introduced from the communication opening 14 during air supply operation passes through the indoor heat exchanger 11. For this reason, during cooling operation or dehumidification operation, the outdoor air is cooled or dehumidified by the indoor heat exchanger 11 and then supplied to the room from the air outlet 19. In addition, unhumidified outdoor air when air supply operation is performed during heating operation, and humidified outdoor air when humidification operation is performed during heating operation, are heated by the indoor heat exchanger 11 and then supplied to the room from the air outlet 19.

[0044] Various sensors are arranged in the indoor unit 2. Here, in the indoor unit 2, an indoor temperature sensor 15, an indoor humidity sensor 16, and an indoor refrigerant sensor 17 are arranged.

[0045] The indoor temperature sensor 15 detects the indoor temperature. The indoor humidity sensor 16 detects the indoor humidity. The indoor temperature sensor 15 and the indoor humidity sensor 16 may be indoor temperature and humidity sensors that detect the indoor temperature and indoor humidity.

[0046] The indoor refrigerant sensor 17 detects refrigerant leaked from the refrigerant circuit 10. Specifically, the indoor refrigerant sensor 17 is a sensor capable of detecting refrigerant when the concentration of the leaked refrigerant becomes equal to or higher than a predetermined value. In this embodiment, since the refrigerant circuit 10 is filled with a refrigerant having a higher specific gravity than air, the indoor refrigerant sensor 17 is preferably disposed, for example, below the indoor heat exchanger 11 or on the downwind side of the indoor heat exchanger 11, and may be disposed on a drain pan (not shown) disposed below the indoor heat exchanger 11.

[0047] The indoor temperature sensor 15, the indoor humidity sensor 16 and the indoor refrigerant sensor 17 may be disposed not in the indoor unit 2 but somewhere inside the room.

[0048] The indoor control unit 13 controls the operation of each part constituting the indoor unit 2. The indoor control unit 13 has a microcomputer including a processor such as a CPU (Central Processing Unit) and memories such as ROM and RAM. The indoor control unit 13 is connected to the outdoor control unit 31 via a communication line, and transmits and receives control signals and the like. The indoor control unit 13 is electrically connected to the indoor temperature sensor 15, the indoor humidity sensor 16, and the indoor refrigerant sensor 17, and receives detection information from each sensor.

[0049] (3) Outdoor unit The outdoor unit 3 has an outdoor air conditioning unit 3a, a ventilation unit 3b, and an outdoor control unit 31.

[0050] The ventilation unit 3b is provided so as to be stacked above the outdoor air-conditioning unit 3a.

[0051] The outdoor control unit 31 controls the operation of each part constituting the outdoor unit 3. The outdoor control unit 31 has a microcomputer including a processor such as a CPU (Central Processing Unit) and memories such as ROM and RAM. The outdoor control unit 31 is connected to the indoor control unit 13 via a communication line, and transmits and receives control signals and the like. The outdoor control unit 31 is electrically connected to an outdoor temperature sensor 33 and an outdoor humidity sensor 34, which will be described later, and receives detection information from each sensor.

[0052] (3-1) Outdoor air conditioning unit The outdoor air conditioning unit 3a includes a compressor 21, a four-way switching valve 22, an accumulator 23, an outdoor heat exchanger 24, an expansion valve 25, a filter 26, a liquid shut-off valve 27, a gas shut-off valve 28, and an outdoor fan 29.

[0053] The compressor 21 is a mechanism for compressing a low-pressure refrigerant in the refrigeration cycle until it becomes high pressure. The four-way switching valve 22 is connected to the discharge side of the compressor 21. The accumulator 23 is connected to the suction side of the compressor 21. The outdoor heat exchanger 24 is connected to the four-way switching valve 22. The expansion valve 25 is connected to the outdoor heat exchanger 24. The expansion valve 25 is connected to the liquid side refrigerant connection pipe 5 via a filter 26 and a liquid stop valve 27. The four-way switching valve 22 is connected to the gas side refrigerant connection pipe 4 via a gas stop valve 28. The gas side refrigerant connection pipe 4 and the liquid side refrigerant connection pipe 5, together with the ventilation duct 6 and the drain hose 8, form a collective connection pipe 9, which is a group of pipes.

[0054] The outdoor fan 29 discharges to the outside the outdoor air after heat exchange in the outdoor heat exchanger 24. The outdoor fan 29 is, for example, a propeller fan. The outdoor fan 29 generates an air flow that passes through the outdoor heat exchanger 24 by driving a fan motor 29a.

[0055] The outdoor unit 3 is provided with various sensors, such as an outdoor temperature sensor 33, an outdoor humidity sensor 34, and an outdoor refrigerant sensor 35. The outdoor temperature sensor 33 detects the outdoor temperature. The outdoor humidity sensor 34 detects the outdoor humidity. The outdoor refrigerant sensor 35 detects refrigerant leaked from the refrigerant circuit 10. Specifically, the outdoor refrigerant sensor 35 is a sensor capable of detecting refrigerant when the concentration of the leaked refrigerant becomes equal to or greater than a predetermined value. In this embodiment, since the refrigerant circuit 10 is filled with a refrigerant having a higher specific gravity than air, the outdoor refrigerant sensor 35 is preferably disposed, for example, below the outdoor heat exchanger 24.

[0056] (3-2) Ventilation unit The ventilation unit 3b is connected to a ventilation duct 6 extending from the indoor unit 2, and is integrated with the outdoor air conditioning unit 3a by being stacked on top of the outdoor air conditioning unit 3a.

[0057] The ventilation unit 3b performs an air supply operation to supply outdoor air to the room, an exhaust operation to exhaust indoor air to the outside, and a humidification operation to supply humidified air to the room. The air supply operation and the humidification operation are the same in that they supply outdoor air to the room, but the air supply operation differs from the humidification operation in that the outdoor air is supplied to the room without being humidified, in that the outdoor air is supplied to the room without being humidified.

[0058] The ventilation unit 3b has a ventilation casing 40, an adsorption / humidification rotor 41, a heater 42, an adsorption / humidification duct 45, an adsorption-side duct 47, a radial fan assembly 43, and an adsorption fan 46.

[0059] The ventilation casing 40 covers the front, rear, both sides and the top surface of the ventilation unit 3b. The ventilation casing 40 is provided with an adsorption air intake port 40b, an adsorption air outlet 40a, and an air supply and exhaust port 40c. The adsorption air intake port 40b is an opening through which air taken in from the outside passes in order to adsorb moisture to the adsorption and humidification rotor 41. The adsorption air outlet 40a is an opening through which air that has passed through the adsorption and humidification rotor 41 is exhausted to the outside. The air supply and exhaust port 40c is an opening through which air taken in to be sent to the indoor unit 2 passes, or through which air taken in from the indoor unit 2 is exhausted to the outside. The adsorption and humidification rotor 41, a heater 42, a radial fan assembly 43, an adsorption fan 46, and the like are arranged inside the ventilation casing 40.

[0060] The adsorption / humidification rotor 41 is a ceramic rotor with a honeycomb structure having a disk shape in a plan view, and is structured so that air can easily pass through it. The adsorption / humidification rotor 41 has a honeycomb-shaped cross section cut on a horizontal plane. The many cylindrical parts of the adsorption / humidification rotor 41, which have polygonal cross sections, extend in the vertical direction, and air passes through them. The main part of the adsorption / humidification rotor 41 is fired from an adsorbent such as zeolite, silica gel, or alumina. This adsorbent has the property of adsorbing moisture in the air it comes into contact with and releasing the moisture when heated. The adsorption / humidification rotor 41 is rotatably supported by a rotating shaft 41a extending in the vertical direction inside the ventilation casing 40. The adsorption / humidification rotor 41 has a rotation drive power unit (not shown), and rotates around the rotating shaft 41a by controlling the power unit by the controller 7.

[0061] The heater 42 heats air that is taken in from outside the room and sent to the adsorption / humidification rotor 41. The heater 42 is attached above the adsorption / humidification rotor 41, and covers a part of the adsorption / humidification rotor 41 from above in a plan view.

[0062] The air intake and humidification duct 45 forms a flow path for sending air taken into the ventilation unit 3b through the air intake and exhaust port 40c to the radial fan assembly 43 via the heater 42 and the air intake and humidification rotor 41, or for passing air that has been sent to the radial fan assembly 43 via the ventilation duct 6 through the air intake and humidification rotor 41 and heater 42, and then discharging it to the outside of the ventilation unit 3b through the air intake and exhaust port 40c.

[0063] The adsorption-side duct 47 constitutes a flow path for passing the outdoor air taken into the ventilation unit 3b through the adsorption air intake port 40b through a portion of the adsorption / humidification rotor 41 where the heater 42 is not located, and then through the adsorption fan 46, and discharging the air from the adsorption air outlet 40a to the outside of the ventilation unit 3b. The air flow in the adsorption-side duct 47 is formed by driving the fan motor 46a of the adsorption fan 46. This allows the moisture contained in the outdoor air to be adsorbed by the adsorption / humidification rotor 41. Then, the dry air after the moisture is adsorbed by the adsorption / humidification rotor 41 can be discharged to the outside of the ventilation unit 3b.

[0064] The radial fan assembly 43 has an intake / exhaust fan 43a and a flow path switching damper 44. When the fan motor 43b is driven, the intake / exhaust fan 43a generates an air flow that passes through the intake / humidification duct 45 and the ventilation duct 6. Here, the direction of the air flow that passes through the intake / humidification duct 45 and the ventilation duct 6 is switched by flow path switching of the flow path switching damper 44.

[0065] When performing exhaust operation in which air that has passed through the indoor unit 2 via the ventilation duct 6 is passed through the intake and humidification duct 45 and discharged to the outside of the outdoor unit 3 from the intake and exhaust port 40c via the intake and humidification rotor 41, the state of the flow path switching damper 44 is switched so that the flow path through which the air that has passed through the ventilation duct 6 flows is connected to the suction side of the intake and exhaust fan 43a and the blowing side of the intake and exhaust fan 43a is connected to the intake and humidification duct 45. In this state, the flow path switching damper 44 closes the flow path so that the suction side of the intake and exhaust fan 43a does not communicate with the intake and humidification duct 45 and the blowing side of the intake and exhaust fan 43a does not communicate with the ventilation duct 6.

[0066] When performing air supply operation in which air taken into the ventilation unit 3b from the air supply and exhaust port 40c and passed through the air intake and humidification rotor 41 is supplied to the indoor unit 2 via the ventilation duct 6, the state of the flow path switching damper 44 is switched so that the air intake and humidification duct 45 is connected to the suction side of the air intake and exhaust fan 43a and the blowing side of the air intake and exhaust fan 43a is connected to the ventilation duct 6. In this state, the flow path switching damper 44 closes the flow path so that the air intake side of the air intake and exhaust fan 43a does not communicate with the ventilation duct 6 and the blowing side of the air intake and exhaust fan 43a does not communicate with the air intake and humidification duct 45.

[0067] (4) Remote Control The remote control 61 is provided in the room. The remote control 61 may be connected to the controller 7 by wire via a transmission line, a communication line, or the like, or may be connected wirelessly.

[0068] The remote control 61 has buttons for selecting heating operation, cooling operation, and dehumidification operation as air conditioning operations, supply air operation, exhaust operation, and humidification operation as ventilation operations, settings of air conditioning operations, etc., and receives instructions for various operations of air conditioning operations and ventilation operations from the user. The remote control 61 also has a display unit 61a such as a liquid crystal display on which the selected operation, set temperature, humidity, messages, etc. are displayed.

[0069] (5) Controller The controller 7 includes an indoor control unit 13 and an outdoor control unit 31, and a wired or wireless connection between them, and includes a computer. The computer has a microcomputer including a processor such as a CPU (Central Processing Unit) and memories such as ROM and RAM. The processor of the controller 7 reads and executes programs stored in the memory to perform predetermined operation control and other processes.

[0070] When fan operation and ventilation operation are being performed after a refrigerant leak is detected, even if the controller 7 receives an instruction from the remote control 61 to stop the fan operation, the ventilation operation, or the operation of the air conditioning device 1, the controller 7 causes the display unit 61a of the remote control 61 to display information that the fan operation and ventilation operation cannot be stopped because a refrigerant leak is occurring.

[0071] (6) Driving behavior Next, the operation of the air conditioner 1 will be described. The air conditioner 1 of this embodiment performs heating operation, cooling operation, and dehumidification operation as air conditioning operations, and performs air supply operation, exhaust operation, and humidification operation as ventilation operations. The various operations are performed by the controller 7 that receives commands from the user via the remote control 61 and controls each component device.

[0072] (6-1) Cooling operation When performing a cooling operation, the controller 7 switches the four-way switching valve 22 to a state in which the outdoor heat exchanger 24 functions as a radiator of the refrigerant and the indoor heat exchanger 11 functions as an evaporator of the refrigerant.

[0073] In the refrigerant circuit in this state, the low-pressure refrigerant in the refrigeration cycle is sucked into the compressor 21, compressed to the high pressure in the refrigeration cycle, and then discharged. The high-pressure refrigerant discharged from the compressor 21 is sent to the outdoor heat exchanger 24 through the four-way switching valve 22. In the outdoor heat exchanger 24, the high-pressure refrigerant exchanges heat with the outdoor air supplied by the outdoor fan 29 and dissipates heat. The high-pressure refrigerant that has dissipated heat in the outdoor heat exchanger 24 is sent to the expansion valve 25 and reduced in pressure to the low pressure in the refrigeration cycle. The low-pressure refrigerant reduced in pressure in the expansion valve 25 is sent to the indoor heat exchanger 11 through the filter 26, the liquid stop valve 27, and the liquid-side refrigerant connection pipe 5. In the indoor heat exchanger 11, the low-pressure refrigerant exchanges heat with the indoor air supplied by the indoor fan 12 and evaporates. As a result, the indoor air is cooled and blown out into the room. The low-pressure refrigerant evaporated in the indoor heat exchanger 11 passes through the gas side refrigerant communication pipe 4, the gas stop valve 28, the four-way switching valve 22, and the accumulator 23, and is sucked into the compressor 21 again.

[0074] In this manner, in the cooling operation, the controller 7 causes the refrigerant sealed in the refrigerant circuit 10 to circulate through the compressor 21, the outdoor heat exchanger 24, the expansion valve 25, and the indoor heat exchanger 11 in this order.

[0075] (6-2) Dehumidification operation When performing the dehumidifying operation, the controller 7 switches the four-way switching valve 22 so that the outdoor heat exchanger 24 functions as a refrigerant radiator and the indoor heat exchanger 11 functions as a refrigerant evaporator, similar to the cooling operation. In the dehumidifying operation, the controller 7 circulates the refrigerant sealed in the refrigerant circuit 10 through the compressor 21, the outdoor heat exchanger 24, the expansion valve 25, and the indoor heat exchanger 11 in this order, similar to the cooling operation.

[0076] (6-3) Heating operation When the heating operation is performed, the controller 7 switches the four-way switching valve 22 to a state in which the outdoor heat exchanger 24 functions as an evaporator of the refrigerant and the indoor heat exchanger 11 functions as a radiator of the refrigerant.

[0077] In the refrigerant circuit 10 in this state, the low-pressure refrigerant in the refrigeration cycle is sucked into the compressor 21, compressed to the high pressure in the refrigeration cycle, and then discharged. The high-pressure refrigerant discharged from the compressor 21 is sent to the indoor heat exchanger 11 through the four-way switching valve 22, the gas shutoff valve 28, and the gas side refrigerant communication pipe 4. In the indoor heat exchanger 11, the high-pressure refrigerant exchanges heat with the indoor air supplied by the indoor fan 12 and dissipates heat. As a result, the indoor air is heated and blown out into the room. The high-pressure refrigerant that has dissipated heat in the indoor heat exchanger 11 is sent to the expansion valve 25 through the liquid side refrigerant communication pipe 5, the liquid shutoff valve 27, and the filter 26, and is reduced in pressure to the low pressure in the refrigeration cycle. The low-pressure refrigerant reduced in pressure in the expansion valve 25 is sent to the outdoor heat exchanger 24. In the outdoor heat exchanger 24, the low-pressure refrigerant exchanges heat with the outdoor air supplied by the outdoor fan 29 and evaporates. The low-pressure refrigerant evaporated in the exterior heat exchanger 24 passes through the four-way switching valve 22 and the accumulator 23 and is sucked back into the compressor 21 .

[0078] In this manner, in the heating operation, the controller 7 controls the refrigerant sealed in the refrigerant circuit to circulate through the compressor 21, the indoor heat exchanger 11, the expansion valve 25, and the outdoor heat exchanger 24 in this order.

[0079] (6-4) Air supply operation When performing air supply operation, the controller 7 switches the state of the flow path switching damper 44 so that the intake / humidification duct 45 is connected to the suction side of the intake / exhaust fan 43a, and the blowing side of the intake / exhaust fan 43a is connected to the ventilation duct 6.

[0080] In this state, when the intake and exhaust fan 43a is driven to form an air flow, outdoor air is taken into the ventilation casing 40 from the intake and exhaust port 40c, and as the outdoor air flows through the intake and humidification duct 45, it passes through approximately the right half of the intake and humidification rotor 41 and is introduced into the heater 42. The outdoor air that has entered the heater 42 passes through approximately the right half of the intake and humidification rotor 41 and reaches the radial fan assembly 43. The radial fan assembly 43 sends the outdoor air that has passed through the intake and humidification duct 45 and the intake and humidification rotor 41 as described above through the ventilation duct 6 and from the communication opening 14 to the indoor unit 2. The outdoor air supplied to the indoor unit 2 passes through the indoor heat exchanger 11 and is blown out into the room from the air outlet 19.

[0081] In this manner, the outdoor air taken in from the outside is guided into the room through a flow path connecting the air supply / exhaust port 40c, the adsorption / humidification rotor 41, the heater 42, the radial fan assembly 43, and the ventilation duct 6.

[0082] (6-5) Exhaust operation When exhaust operation is performed, the controller 7 switches the state of the flow path switching damper 44 so that the flow path through which the air that has passed through the ventilation duct 6 flows is connected to the suction side of the intake and exhaust fan 43a, and the blowing side of the intake and exhaust fan 43a is connected to the intake and humidification duct 45.

[0083] In this state, when the intake and exhaust fan 43a is driven to form an air flow, the indoor air taken in through the suction port 18 of the indoor unit 2 passes through the connecting opening 14, the ventilation duct 6 and reaches the radial fan assembly 43.

[0084] The indoor air that has reached the radial fan assembly 43 passes through approximately the right half of the absorption / humidification rotor 41 as it flows through the absorption / humidification duct 45, and is introduced into the heater 42. Then, the indoor air that has entered the heater 42 passes through approximately the right half of the absorption / humidification rotor 41, and is exhausted to the outside through the air supply / exhaust port 40c.

[0085] In this way, the indoor air taken in from the indoor unit 2 passes through the flow path in the opposite direction to that during the air supply operation, and is exhausted to the outside from the ventilation unit 3b.

[0086] (6-6) Humidification operation The humidification operation is basically similar to the flow path in which outdoor air is supplied to the room air during the air supply operation, but differs in that the outdoor air is humidified.

[0087] Specifically, the ventilation unit 3b rotates the adsorption fan 46 to take in air from outside the room through the adsorption air suction port 40b into the ventilation casing 40. The air that has entered the ventilation casing 40 passes through approximately the left half of the adsorption / humidification rotor 41, and then passes through the adsorption side duct 47 and the adsorption fan 46, before being discharged to the outside of the ventilation unit 3b through the adsorption air outlet 40a. When the air taken in from outside the room into the ventilation casing 40 passes through approximately the left half of the adsorption / humidification rotor 41, the adsorption / humidification rotor 41 adsorbs moisture contained in the air.

[0088] The approximately left half of the adsorption / humidification rotor 41 that has adsorbed moisture in this adsorption process becomes approximately the right half of the adsorption / humidification rotor 41 as the adsorption / humidification rotor 41 rotates. The moisture that has moved to the approximately right half of the adsorption / humidification rotor 41 is then released into the airflow generated by the intake / exhaust fan 43a by the heat from the heater 42. As a result, the air sent toward the indoor unit 2 becomes humidified air.

[0089] (6-7) Air supply operation during cooling or dehumidification operation The controller 7 performs a cooling operation or a dehumidifying operation, and also controls the ventilation unit 3b to perform the above-mentioned air supply operation.

[0090] Specifically, in accordance with the above-mentioned air supply operation, the ventilation unit 3b supplies outdoor air to the communication opening 14 of the indoor unit 2 via the ventilation duct 6. This outdoor air passes through the indoor heat exchanger 11, where it is cooled or dehumidified, and then supplied to the room. Therefore, the outdoor air supplied by the outdoor air supply unit 3a is supplied to the room together with the indoor air that has been cooled or dehumidified by the outdoor air-conditioning unit 3a.

[0091] (6-8) Exhaust operation during cooling or dehumidification operation The controller 7 performs a cooling operation or a dehumidifying operation, and also controls the ventilation unit 3b to perform the exhaust operation described above.

[0092] Specifically, in accordance with the above exhaust operation, the ventilation unit 3b supplies the indoor air taken in through the suction port 18 of the indoor unit 2 to the ventilation unit 3b through the communication opening 14 of the indoor unit 2 and the ventilation duct 6. The air supplied to the ventilation unit 3b is exhausted to the outside from the ventilation unit 3b. Therefore, a part of the indoor air taken in through the suction port 18 of the indoor unit 2 is exhausted to the outside by the ventilation unit 3b, and another part of the indoor air taken in through the suction port 18 of the indoor unit 2 is cooled or dehumidified through the indoor heat exchanger 11 and supplied to the room.

[0093] (6-9) Air supply operation or humidification operation during heating operation The controller 7 performs the heating operation and also controls the ventilation unit 3b to perform the above-mentioned air supply operation or humidification operation.

[0094] Specifically, the ventilation unit 3b supplies outdoor air that has not been humidified according to the above-mentioned air supply operation, or outdoor air that has been humidified according to the above-mentioned humidification operation, to the communication opening 14 of the indoor unit 2 via the ventilation duct 6. This outdoor air passes through the indoor heat exchanger 11, is heated, and is supplied to the indoor space. Therefore, the outdoor air introduced by the ventilation unit 3b is supplied to the room together with the heated indoor air.

[0095] (6-10) Exhaust operation during heating operation The controller 7 performs the heating operation and also controls the ventilation unit 3b to perform the exhaust operation described above.

[0096] Specifically, in accordance with the above exhaust operation, the ventilation unit 3b supplies indoor air from the communication opening 14 of the indoor unit 2 through the ventilation duct 6 to the ventilation unit 3b. This indoor air is exhausted to the outside from the ventilation unit 3b. Therefore, a part of the indoor air is exhausted to the outside by the ventilation unit 3b, and another part of the indoor air is heated by the outdoor air-conditioning unit 3a through the indoor heat exchanger 11 and supplied to the room.

[0097] (6-11) Fan operation When refrigerant leaks from the refrigerant circuit 10, the controller 7 stops the compressor 21 and performs a blowing operation by continuing to drive the indoor fan 12. Specifically, when the indoor refrigerant sensor 17 or the outdoor refrigerant sensor 35 detects refrigerant leakage, the controller 7 stops the compressor 21 and continues to drive the indoor fan 12 until the indoor refrigerant sensor 17 or the outdoor refrigerant sensor 35 no longer detects refrigerant.

[0098] (7) Leak control When a refrigerant leak is detected by the indoor refrigerant sensor 17 or the outdoor refrigerant sensor 35, the controller 7 performs control in response to the leak, as shown in the flowchart of Fig. 4. Note that, here, an example will be described in which processing is performed from a state in which normal operation is being performed, including air conditioning operations such as the cooling operation, dehumidification operation, and heating operation, ventilation operations such as air supply operation, exhaust operation, and humidification operation, and combinations of these.

[0099] In step S11, the controller 7 judges whether the indoor refrigerant sensor 17 detects a leaked refrigerant. Here, if the indoor fan 12 is in operation, it is maintained in operation, and if the indoor fan 12 is not in operation, the indoor fan 12 is operated to generate a predetermined air volume, and then the indoor refrigerant sensor 17 performs detection. As a result, even if refrigerant is leaking outside the vicinity of the indoor refrigerant sensor 17, the indoor refrigerant sensor 17 can detect it by generating an air flow. Note that the air volume of the indoor fan 12 here may be half or less of the predetermined maximum air volume, or may be one-fourth or less. If the indoor refrigerant sensor 17 detects a leaked refrigerant, the process proceeds to step S19 to start each process when a refrigerant leaks indoors. If the indoor refrigerant sensor 17 does not detect a leaked refrigerant, the process proceeds to step S12.

[0100] In step S12, the controller 7 determines whether or not the outdoor refrigerant sensor 35 has detected a leaking refrigerant. If the outdoor refrigerant sensor 35 has detected a leaking refrigerant, the process proceeds to step S13 to start various processes to be performed when a refrigerant leaks outdoors. If the outdoor refrigerant sensor 35 has not detected a leaking refrigerant, the process returns to step S11.

[0101] In step S13, the controller 7 stops the compressor 21 if it is operating, and maintains the compressor 21 in a stopped state if it is stopped. This stops the circulation of the refrigerant in the refrigerant circuit 10, making it possible to suppress further leakage of the refrigerant from the leakage point.

[0102] In step S14, the controller 7 notifies that a refrigerant leak has occurred outdoors. Here, the controller 7 displays on the display unit 61a of the remote control 61 that a refrigerant leak has occurred outdoors and that the operation of the compressor 21 has been stopped as a result. If the remote control 61 is configured to include a speaker or the like and to be capable of outputting audio, the notification may also be made by audio output.

[0103] In step S15, the controller 7 maintains the outdoor fan 29 in a driven state. Specifically, here, the controller 7 controls the outdoor fan 29 so that the air volume is maintained at a predetermined maximum air volume. Even if the user issues an instruction to stop the air blowing operation of the outdoor fan 29 by operating the remote control, the controller 7 does not accept the instruction and maintains the outdoor fan 29 in the air blowing operation state.

[0104] In step S16, the controller 7 sets the flow path switching damper 44 to an exhaust operation state, and controls the intake and exhaust fan 43a to maintain a predetermined maximum air volume. This performs exhaust operation in which air that has passed through the ventilation duct 6, the radial fan assembly 43, and the intake and humidification duct 45 from the indoor unit 2 is exhausted from the intake and exhaust port 40c to the outside of the outdoor unit 3. Even if the user issues an instruction to stop the exhaust operation by operating the remote control, the controller 7 does not accept the instruction and maintains the state of exhaust operation by the intake and exhaust fan 43a.

[0105] In step S17, similarly to step S12, the controller 7 determines whether or not a leaking refrigerant has been detected by the outdoor refrigerant sensor 35. If a leaking refrigerant has been detected by the outdoor refrigerant sensor 35, the process returns to step S15 and continues the processing of steps S15 and S16. If a leaking refrigerant is no longer detected by the outdoor refrigerant sensor 35, the process proceeds to step S18.

[0106] In step S18, the controller 7 stops the blowing operation of the outdoor fan 29, and stops the exhaust operation by the intake and exhaust fan 43a.

[0107] In step S19, the controller 7 stops the compressor 21 if it is operating, and maintains the compressor 21 in a stopped state if it is in a stopped state. This stops the circulation of the refrigerant in the refrigerant circuit 10, making it possible to suppress further leakage of the refrigerant from the leakage point.

[0108] In step S20, the controller 7 notifies the user that a refrigerant leak has occurred indoors. Here, the controller 7 displays on the display unit 61a of the remote control 61 that a refrigerant leak has occurred indoors and that the operation of the compressor 21 has been stopped as a result. If the remote control 61 is configured to include a speaker or the like and to be capable of outputting audio, the controller 7 may also notify the user by audio output.

[0109] In step S21, the controller 7 maintains the indoor fan 12 in a driven state. Specifically, here, the controller 7 controls the air volume of the indoor fan 12 to be maintained at a predetermined maximum air volume. Even if the user issues an instruction to stop the air blowing operation of the indoor fan 12 by operating the remote control, the controller 7 does not accept the instruction and maintains the air blowing operation state of the indoor fan 12.

[0110] In step S22, the controller 7 selects and executes either the ventilation operation performed when step S11 was performed, or the ventilation operation performed last, which is either the supply operation or the exhaust operation. Then, the controller 7 controls the intake and exhaust fan 43a so as to maintain a predetermined maximum air volume. As a result, when the exhaust operation is performed, air that has passed through the ventilation duct 6, the radial fan assembly 43, and the intake and humidification duct 45 from the indoor unit 2 is exhausted to the outside of the outdoor unit 3 from the intake and exhaust port 40c. When the supply operation is performed, the outdoor air taken into the outdoor unit 3 from the intake and exhaust port 40c is supplied from the indoor unit 2 to the room through the intake and humidification duct 45, the radial fan assembly 43, the ventilation duct 6, and the communication opening 14. Even if the user operates the remote control to instruct the supply operation or exhaust operation, which is a ventilation operation, the controller 7 does not accept the instruction and maintains the state of the ventilation operation by the intake and exhaust fan 43a.

[0111] In step S23, the controller 7 determines whether or not the indoor refrigerant sensor 17 has detected a leaking refrigerant, similar to step S11. If the indoor refrigerant sensor 17 has detected a leaking refrigerant, the process returns to step S21 and continues the processing of steps S21 and S22. If the indoor refrigerant sensor 17 has not detected a leaking refrigerant, the process proceeds to step S24.

[0112] In step S24, the controller 7 stops the air blowing operation of the indoor fan 12, and stops the ventilation operation by the intake / exhaust fan 43a.

[0113] (8) Features In the air conditioning device 1 of this embodiment, when the indoor refrigerant sensor 17 detects a leaking refrigerant, the indoor fan 12 maintains the blowing operation. This makes it possible to suppress an increase in the refrigerant concentration around the leaking point in the room. In addition, when the indoor refrigerant sensor 17 detects a leaking refrigerant, the indoor fan 12 performs the blowing operation and the ventilation operation, which is the supply operation or exhaust operation, by the intake and exhaust fan 43a. This makes it possible to prevent the refrigerant from accumulating in the room by continuing to supply outdoor air to the room where the leak is occurring when the supply operation is performed as the ventilation operation, and to maintain the refrigerant concentration low. In addition, when the exhaust operation is performed as the ventilation operation, the air in the room where the leak is occurring is exhausted to the outside, making it possible to prevent the refrigerant from accumulating in the room and to maintain the refrigerant concentration low.

[0114] Furthermore, the air conditioner 1 of this embodiment is equipped with an outdoor refrigerant sensor 35, and can detect outdoor refrigerant leakage. If refrigerant leaks outdoors, exhaust operation is performed. This prevents the refrigerant leaking outdoors from being introduced indoors.

[0115] In addition, in the ventilation operation when a refrigerant leaks, it is possible to use the ventilation flow passages such as the ventilation duct 6 that are used in the ventilation operation during normal operation when no leakage occurs.

[0116] In addition, when a refrigerant leaks, the blowing operation by the indoor fan 12 and the outdoor fan 29, and the supply operation or exhaust operation, which is a ventilation operation by the intake and exhaust fan 43a, are maintained. Specifically, even if the user issues an instruction to stop the blowing operation or the ventilation operation by operating the remote control, the instruction is not accepted, and the blowing operation by the indoor fan 12 and the outdoor fan 29, and the supply operation or exhaust operation, which is a ventilation operation by the intake and exhaust fan 43a, are maintained. As the indoor fan 12, the outdoor fan 29, and the intake and exhaust fan 43a continue to be driven even though the operation of the compressor 21 has stopped due to the refrigerant leak, the user may try to stop them. However, by continuing the blowing operation or the ventilation operation without accepting an instruction from the user, the occurrence of a location with a high refrigerant concentration is reliably suppressed.

[0117] (9) Other embodiments (9-1) Other embodiment A In the above embodiment, an example has been described in which, when a refrigerant leak occurs indoors, the ventilation operation that was being performed immediately before in step S22 is continued.

[0118] In contrast to this, for example, as shown in the flowchart of FIG. 5, step S22 in the above embodiment may be replaced by step S22a in which the air supply operation is performed, and step S24 in the above embodiment may be replaced by step S24a in which the air supply operation is terminated.

[0119] In this case, the flow direction of the ventilation air flowing through the ventilation duct 6 will be reversed between when a refrigerant leak is detected by the outdoor refrigerant sensor 35 and when a refrigerant leak is detected by the indoor refrigerant sensor 17. Even in this case, it is possible to prevent the refrigerant that leaks outdoors from being led indoors, while preventing the refrigerant that leaks indoors from continuing to stagnate indoors.

[0120] (9-2) Other embodiment B In the above embodiment, an example has been described in which, when a refrigerant leak occurs indoors, the ventilation operation that was performed immediately before in step S22 is continued, and, when a refrigerant leak occurs outdoors, the blowing operation by the outdoor fan 29 and the exhaust operation by the intake and exhaust fan 43a are maintained.

[0121] Alternatively, for example, as shown in the flowchart of FIG. 6, step S22 in the above embodiment may be replaced by step S22b in which exhaust operation is performed, and step S24 in the above embodiment may be replaced by step S24b in which exhaust operation is terminated.

[0122] Furthermore, when a refrigerant leak is detected by the outdoor refrigerant sensor 35, natural ventilation is performed outdoors, so that the outdoor fan 29 may not be operated to blow air, and exhaust operation from inside the room may also not be performed.

[0123] (9-3) Other embodiment C In the above embodiment, the process when a refrigerant leak is detected either indoors or outdoors has been described as an example.

[0124] On the other hand, when a refrigerant leakage is detected simultaneously by the indoor refrigerant sensor 17 and the outdoor refrigerant sensor 35, the indoor fan 12 may perform air blowing operation and the intake / exhaust fan 43a may perform exhaust operation simultaneously. In this case, the outdoor fan 29 may or may not perform air blowing operation.

[0125] (Additional Note) Although the embodiments of the present disclosure 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 present disclosure described in the claims. [Explanation of symbols]

[0126] 1. Air conditioning equipment 2 Indoor unit 3 Outdoor unit 3a Outdoor air conditioning unit 3b Ventilation unit 4 Gas side refrigerant connection piping 5 Liquid refrigerant connection pipe 6 Ventilation duct (ventilation channel) 7 Controller 8 Drain hose 9 Collector Pipe 10 Refrigerant circuit 11 Indoor heat exchanger 12 Indoor fan (indoor blower) 13 Indoor control unit 14 Access opening 15 Indoor temperature sensor 16 Indoor Humidity Sensor 17 Indoor refrigerant sensor (indoor detector) 18 Intake port 19 Air outlet 20 Indoor casing 21 Compressor 22 Four-way valve 24 Outdoor heat exchanger 25 Expansion valve 29 Outdoor fan 31 Outdoor control unit 33 Outdoor temperature sensor 34 Outdoor humidity sensor 35 Outdoor refrigerant sensor (outdoor detection section) 40 Ventilation casing 40a Air outlet for suction 40b Air intake for suction 40c supply / exhaust port 41 Moisture absorption rotor 42 Heater 43 Radial fan assembly 43a Intake and exhaust fan 44 Flow path switching damper 45 Humidification duct (ventilation channel) 46 Adsorption fan 47 Suction side duct 61 Remote control (controller) 61a Display unit (notification unit) [Prior art documents] [Patent documents]

[0127] [Patent Document 1] JP 2016-166680 A

Claims

1. An indoor heat exchanger (11); an indoor blower (12) capable of blowing air to supply air to the indoor heat exchanger for heat exchange with a refrigerant flowing inside the indoor heat exchanger; A ventilation flow path (6, 45) used for at least one of ventilation operations for exhausting indoor air to the outside of the room or supplying the outdoor air to the room; an indoor detection unit (17) that detects the refrigerant leaked into the room; a flow path switching damper (44) that switches the direction of air flow in the ventilation flow path between the exhaust direction and the supply direction; an outdoor detection unit (35) that detects the refrigerant leaked to the outside of the room; Equipped with The refrigerant is a flammable refrigerant, When the indoor detection unit detects a leak of the refrigerant, the air blowing operation and the ventilation operation can be performed simultaneously, When the indoor detection unit detects a leakage of the refrigerant and when the outdoor detection unit detects a leakage of the refrigerant, the direction of the air flow in the ventilation flow path in the ventilation operation is switched, When the indoor detection unit detects a leakage of the refrigerant, the indoor blower unit is operated in the blowing operation, and in the ventilation operation, the outdoor air is supplied to the room through the ventilation flow path, When the outdoor detection unit detects leakage of the refrigerant, an outdoor fan that generates an air flow passing through an outdoor heat exchanger is driven, and in the ventilation operation, air in the room is exhausted to the outside through the ventilation flow path. Air conditioning unit (1).

2. The air conditioner further includes a controller (61, 7) that receives a stop operation for stopping the air blowing operation or the ventilation operation when the indoor detection unit does not detect the leakage of the refrigerant, The controller does not accept the stop operation while the air blowing operation and the ventilation operation are being performed due to the detection of the refrigerant leakage. The air conditioning apparatus according to claim 1.

3. The indoor detection unit detects leakage of the refrigerant while performing the air blowing operation.

3. An air conditioning apparatus according to claim 1 or 2.

4. The ventilation operation can be performed in a state where the indoor detection unit does not detect the leakage of the refrigerant. An air-conditioning apparatus according to any one of claims 1 to 3.

5. The indoor heat exchanger is further provided with a compressor (21) connected to the indoor heat exchanger via a refrigerant pipe, When the indoor detection unit detects a leakage of the refrigerant, the operation of the compressor is stopped. An air-conditioning apparatus according to any one of claims 1 to 4.

6. Further provided with an alarm unit (61a) that notifies the leakage of the refrigerant when the indoor detection unit detects the leakage of the refrigerant, An air-conditioning apparatus according to any one of claims 1 to 5.

7. The flammable refrigerant includes one or more selected from the group consisting of R290, R600, and R600a. An air-conditioning apparatus according to any one of claims 1 to 6.

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