TWI817412B - Air conditioning system, air conditioning system control method, and air conditioning system control program - Google Patents

Abstract

The present disclosure provides an air conditioning system that can suppress condensation on a heat exchange element of a ventilation unit, a control method of the air conditioning system, and a control program of the air conditioning system. The air conditioning system of the present disclosure includes: an indoor unit including an indoor heat exchanger; a ventilation unit including a heat exchange element that exchanges heat between indoor air and outdoor air; and a humidity sensor that detects the direction of heat exchange. The humidity of the air in the element; and the indoor mechanism is configured to: execute the first dehumidification operation started based on the start instruction from the user, and the second dehumidification operation executed as a condensation suppression operation to suppress condensation on the heat exchange element, indoors The machine controls the indoor air humidity to less than the first threshold during the first dehumidification operation. When the indoor air humidity is higher than the second threshold that is higher than the first threshold, the indoor air humidity does not reach the second threshold. to execute the second dehumidification operation.

Description

Air conditioning system, air conditioning system control method, and air conditioning system control program

The present disclosure relates to an air conditioning system, a control method of the air conditioning system, and a control program of the air conditioning system.

Patent Document 1 discloses a heat exchange ventilation device that performs integral ventilation of total heat exchange ventilation. The heat exchange ventilation device includes: a heat exchanger; a body frame that supports the heat exchanger; and a liquid receiving member that is disposed below the heat exchanger in the body frame. In this heat exchange ventilation device, water attached to the heat exchanger due to dew condensation drips toward the liquid receiving member.

[Prior technical literature] [Patent Document]

[Patent Document 1] Japanese Patent Application Publication No. 2011-144995

Although the above-mentioned heat exchange ventilation device can handle water generated due to condensation, the point of suppressing the generation of condensation itself has not been studied.

The purpose of this disclosure is to provide an air conditioning system that can suppress condensation on the heat exchange element of a ventilation unit, a control method of the air conditioning system, and a control program of the air conditioning system.

The air conditioning system of the present disclosure includes: an indoor unit including an indoor heat exchanger; a ventilation unit including a heat exchange element for exchanging heat between indoor air and outdoor air; and a humidity sensor that detects the direction of the heat exchanger. The humidity of the air in the exchange element; the indoor mechanism is configured to execute a first dehumidification operation started based on a start instruction from the user, and a second dehumidification operation executed as a condensation suppression operation to suppress dew condensation on the heat exchange element. , the above-mentioned indoor unit controls the air humidity in the above-mentioned room to be less than the first threshold during the above-mentioned first dehumidification operation, and when the air humidity in the above-mentioned room is higher than the second threshold that is higher than the above-mentioned first threshold, the above-mentioned indoor unit The above-mentioned second dehumidification operation is performed when the air humidity does not reach the above-mentioned second threshold. According to this air conditioning system, condensation on the heat exchange element of the ventilation unit can be suppressed.

In the above-mentioned air conditioning system, the above-mentioned indoor unit may perform the above-mentioned operation when the indoor air humidity is above the above-mentioned second threshold, and the above-mentioned outdoor air humidity is above a third threshold that is higher than the above-mentioned first threshold. 2nd dehumidification operation. According to this air conditioning system, the generation of dew condensation on the heat exchange element of the ventilation unit can be better suppressed.

In the above air conditioning system, the indoor unit may execute the second dehumidification when the air humidity in the room is above the second threshold and the continuous operation time of the ventilation unit is above the first specific time. operation. According to this air conditioning system, the generation of dew condensation on the heat exchange element of the ventilation unit can be better suppressed.

The air conditioning system of the present disclosure includes: an indoor unit including an indoor heat exchanger; a ventilation unit including a heat exchange element for exchanging heat between indoor air and outdoor air; and a humidity sensor that detects the direction of the heat exchanger. The humidity of the air in the exchange element; the indoor unit is configured to perform a second dehumidification operation as a condensation suppression operation for suppressing dew condensation in the heat exchange element. The condensation suppression operation uses the indoor heat exchanger as an evaporator In the operation of the appliance, when the operation of the above-mentioned indoor unit is in a stopped state, when the operation start conditions of the above-mentioned indoor unit are met, the above-mentioned indoor unit starts to start the above-mentioned condensation suppression operation. The above-mentioned operation start conditions include the indoor air humidity. conditions, and at least one of the conditions related to the outdoor air humidity mentioned above. According to this air conditioning system, condensation on the heat exchange element of the ventilation unit can be suppressed.

In the above air conditioning system, the operation start conditions may include both the conditions related to the indoor air humidity and the conditions related to the outdoor air humidity. According to this air conditioning system, the generation of dew condensation on the heat exchange element of the ventilation unit can be better suppressed.

In the above-mentioned air conditioning system, the above-mentioned operation start conditions may further include conditions related to the continuous operation time of the above-mentioned ventilation unit. According to this air conditioning system, the generation of dew condensation on the heat exchange element of the ventilation unit can be better suppressed.

In the above-mentioned air conditioning system, when the above-mentioned indoor unit executes the above-mentioned dew condensation suppression operation, when the time in which the air humidity in the above-mentioned room does not reach the operation stop threshold reaches the second specific time, or the execution may be performed. The above-mentioned condensation suppression operation time reaches the third specific time time, stop the above-mentioned condensation suppression operation. According to this air conditioning system, the power consumption of the indoor unit can be reduced.

In the above air conditioning system, the ventilation unit may include an air supply fan that supplies air to the indoor unit and an exhaust fan that discharges air from the indoor unit, and the air supply fan and the exhaust fan are executed by the indoor unit. In the above-described condensation-suppressed operation, the exhaust air volume is controlled so that it exceeds the supply air volume. According to this air conditioning system, the generation of dew condensation on the heat exchange element of the ventilation unit can be better suppressed.

In the above-mentioned air conditioning system, when the above-mentioned indoor unit performs the above-mentioned dew condensation suppression operation, control may be performed in such a manner that the above-mentioned exhaust fan is driven in a state where the above-mentioned air supply fan is stopped. According to this air conditioning system, the power consumption of the ventilation unit can be reduced.

In the above-mentioned air conditioning system, when the above-mentioned dew condensation suppression operation is executed by the above-mentioned indoor unit, it may be reported that the above-mentioned dew condensation suppression operation has been executed. According to this air conditioning system, convenience is improved.

The control method of the air conditioning system disclosed in the present disclosure is a control method of the air conditioning system. The air conditioning system is provided with: an indoor unit including an indoor heat exchanger, a ventilation unit including a heat exchange element for heat exchange between indoor air and outdoor air, and a humidity sensor that detects the humidity of the air facing the heat exchange element, and the indoor mechanism is configured to execute the first dehumidification operation started based on a start instruction from the user and to suppress dew condensation on the heat exchange element. The second dehumidification operation of the condensation suppression operation is executed, and the control method of the above-mentioned air-conditioning system includes: using the above-mentioned room The above-mentioned indoor unit performs the above-mentioned first dehumidification operation when the indoor air humidity does not reach the first threshold; and when the above-mentioned indoor air humidity is higher than the second threshold above the above-mentioned first threshold, the above-mentioned indoor air When the humidity does not reach the second threshold, the indoor unit executes the second dehumidification operation. According to the control method of the air conditioning system, condensation on the heat exchange element of the ventilation unit can be suppressed.

The control program of the air conditioning system disclosed in this disclosure is a control program of the air conditioning system. The air conditioning system is provided with: an indoor unit including an indoor heat exchanger, a ventilation unit including a heat exchange element for heat exchange between indoor air and outdoor air, and a humidity sensor that detects the humidity of the air facing the heat exchange element, and the indoor mechanism is configured to execute the first dehumidification operation started based on a start instruction from the user and to suppress dew condensation on the heat exchange element. The second dehumidification operation of the condensation suppression operation is executed, and the control program of the above-mentioned air conditioning system causes the computer to perform the following processing: causing the above-mentioned indoor unit to execute the above-mentioned first dehumidification operation in such a manner that the air humidity in the above-mentioned room does not reach the first threshold; and When the air humidity in the room is greater than the second threshold value which is higher than the first threshold value, the indoor unit is caused to perform the second dehumidification operation in such a manner that the air humidity in the room does not reach the second threshold value. According to the control program of the air conditioning system, condensation on the heat exchange elements of the ventilation unit can be suppressed.

The control method of the air conditioning system disclosed in the present disclosure is a control method of the air conditioning system. The air conditioning system is provided with: an indoor unit including an indoor heat exchanger, a ventilation unit including a heat exchange element for heat exchange between indoor air and outdoor air, and a humidity sensor that detects the humidity of the air facing the heat exchange element. The indoor unit is configured to perform a second dehumidification operation as a condensation suppression operation for suppressing condensation of the heat exchange element. The dew condensation suppression operation is performed Operation system The above-mentioned indoor heat exchanger is operated as an evaporator, and the control method of the above-mentioned air conditioning system includes: when the operation of the above-mentioned indoor unit is in a stopped state, when the operation start condition of the above-mentioned indoor unit is met, starting the above-mentioned indoor unit The indoor unit is caused to start the dew condensation suppressing operation, and the operation starting conditions include at least one of the conditions related to the indoor air humidity and the conditions related to the outdoor air humidity. According to the control method of the air conditioning system, condensation on the heat exchange element of the ventilation unit can be suppressed.

The control program of the air conditioning system disclosed in this disclosure is a control program of the air conditioning system. The air conditioning system is provided with: an indoor unit including an indoor heat exchanger, a ventilation unit including a heat exchange element for heat exchange between indoor air and outdoor air, and a humidity sensor that detects the humidity of the air facing the heat exchange element. The indoor unit is configured to perform a second dehumidification operation as a condensation suppression operation for suppressing condensation of the heat exchange element. The dew condensation suppression operation is performed The operation is an operation in which the above-mentioned indoor heat exchanger is used as an evaporator, and the control program of the above-mentioned air-conditioning system includes causing the computer to execute the following processing: when the operation of the above-mentioned indoor unit is in a stopped state, when the conditions are met, the operation of the above-mentioned indoor unit is started. When the conditions are met, the indoor unit is started to start the dew condensation suppressing operation, and the operation starting conditions include at least one of the conditions related to the indoor air humidity and the conditions related to the outdoor air humidity. According to the control program of the air conditioning system, condensation on the heat exchange elements of the ventilation unit can be suppressed.

10:Air conditioning system

20:Air conditioning device

30: Indoor unit

30A: Shell

31:Indoor heat exchanger

32:Indoor fan

33:Temperature sensor

34:Humidity sensor

35: Electric expansion valve

36:Control device

40:Outdoor unit

41:Compressor

42: Four-way switching valve

43: Outdoor heat exchanger

44:Pressure accumulator

45:Outdoor fan

46:Temperature sensor

47:Humidity sensor

48:Control device

50: Ventilation unit

51: Shell

51A: Outside air suction port

51B: Indoor air supply port

51C:Exhaust suction port

51D:Exhaust blower outlet

52:Air supply fan

53:Exhaust fan

54:Heat exchange element

55:Control device

56:Memory device

57:Remote control

60:Remote control

70:System Control Department

71:Memory device

71A:Control program

81: Suction tube

82: Supply pipe

83: Suction tube

84:Exhaust pipe

RC: refrigerant circuit

S11~S17: Steps

S21~S26: Steps

FIG. 1 is a diagram showing the schematic configuration of the air conditioning system according to the embodiment.

FIG. 2 is a diagram showing the schematic structure of the system control unit.

FIG. 3 is a flowchart showing an example of a processing sequence for condensation suppression control.

FIG. 4 is a flowchart showing an example of a processing sequence of fan drive control.

Hereinafter, this embodiment will be described with reference to the drawings. In addition, the same or equivalent parts in the figures are given the same symbols, and the same descriptions are not repeated.

<1. Composition of air conditioning system>

FIG. 1 is a diagram showing the schematic configuration of the air conditioning system 10 of this embodiment. The air conditioning system 10 can be used in any building. The building is, for example, an individual residence, a collective residence, or a commercial facility. The air conditioning system 10 includes an air conditioning device 20 and a ventilation unit 50 . The air conditioning device 20 includes an indoor unit 30 and an outdoor unit 40 . The indoor unit 30 is installed behind a ceiling in a building, for example. The outdoor unit 40 is installed outdoors. The ventilation unit 50 is installed in a building, for example, behind a ceiling. The ventilation unit 50 performs overall ventilation, for example. In the air conditioning system 10, the indoor unit 30 and the outdoor unit 40 constitute a refrigerant circuit RC (Refrigerant Circuit).

The indoor unit 30 includes an indoor heat exchanger 31 , an indoor fan 32 , a temperature sensor 33 , a humidity sensor 34 , an electric expansion valve 35 , and a control device 36 . The indoor heat exchanger 31, the indoor fan 32, the temperature sensor 33, the humidity sensor 34, and the electric expansion valve 35 are housed in the casing 30A.

The indoor heat exchanger 31 is used for heat exchange between indoor air and refrigerant. The indoor heat exchanger 31 functions as an evaporator or a condenser of the refrigerant. The indoor fan 32 supplies indoor air to the indoor heat exchanger 31 .

The temperature sensor 33 detects the indoor temperature. The humidity sensor 34 detects the humidity of indoor air. The humidity of the air detected by the humidity sensor 34 includes the humidity of the air facing the heat exchange element 54 of the ventilation unit 50 . The electric expansion valve 35 decompresses the refrigerant.

The control device 36 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), etc., and controls the indoor fan 32 etc. based on information processing. its constituent elements. The control device 36 is communicably connected to the control device 48 of the indoor unit 40 and the control device 55 of the ventilation unit 50 . The communication form between the control device 36, the control device 48 and the control device 55 is wireless communication or wired communication. The control device 36 constitutes a part of the system control unit 70 (see FIG. 2 ).

The outdoor unit 40 includes a compressor 41 , a four-way switching valve 42 , an outdoor heat exchanger 43 , a pressure accumulator 44 , an outdoor fan 45 , a temperature sensor 46 , a humidity sensor 47 , and a control device 48 .

The compressor 41 compresses the refrigerant. The outdoor heat exchanger 43 is used for heat exchange between outdoor air and refrigerant. The outdoor heat exchanger 43 functions as an evaporator or a condenser of the refrigerant. The outdoor fan 45 supplies outdoor air to the outdoor heat exchanger 43 .

The four-way switching valve 42 switches the cold air circulation state and the warm air circulation state in the refrigerant circuit RC. In the cold air circulation state, the outdoor heat exchanger 43 functions as a condenser, and the indoor heat exchanger 31 functions as an evaporator. In the heating circulation state, the outdoor heat exchanger 43 functions as an evaporator, and the indoor heat exchanger 31 functions as a condenser.

The accumulator 44 separates the refrigerant liquid mixed in the vapor generated by the evaporator. The temperature sensor 46 detects the outdoor temperature. The humidity sensor 47 detects the humidity of the outdoor air. The humidity of the air detected by the humidity sensor 47 includes the humidity of the air facing the heat exchange element 54 of the ventilation unit 50 .

The control device 48 includes a CPU, RAM, ROM, etc., and controls components such as the compressor 41, the four-way switching valve 42, the outdoor fan 45, etc. based on information processing. The control device 48 constitutes a part of the system control unit 70 (see FIG. 2 ).

In the air conditioning device 20, the indoor heat exchanger 31, the compressor 41, the four-way switching valve 42, the outdoor heat exchanger 43, the electric expansion valve 35, and the pressure accumulator 44 are connected in a ring to form a refrigerant circuit. RC.

The ventilation unit 50 includes a housing 51 , an air supply fan 52 , an exhaust fan 53 , a heat exchange element 54 , a control device 55 , a memory device 56 , and a remote control 57 .

The casing 51 is, for example, box-shaped, and accommodates the air supply fan 52 , the exhaust fan 53 , and the heat exchange element 54 . The casing 51 includes an outdoor air suction port 51A, an indoor air supply port 51B, an exhaust suction port 51C, and an exhaust blower outlet 51D.

The outdoor air inlet 51A allows air flowing from the outside into the housing 51 to pass. The outside air suction port 51A is connected to a suction pipe 81 that extracts outdoor air to the casing 51 . The indoor air supply port 51B allows air heat-exchanged by the heat exchange element 54 to pass therethrough. At the indoor air supply port 51B, connect the The air heat-exchanged by the heat exchange element 54 is supplied to the indoor supply pipe 82 . The exhaust suction port 51C allows air flowing from the room into the housing 51 to pass. The exhaust suction port 51C is connected to a suction pipe 83 that extracts indoor air to the casing 51 . The exhaust air outlet 51D allows the air heat-exchanged by the heat exchange element 54 to pass therethrough. The exhaust air outlet 51D is connected to an exhaust pipe 84 for exhausting the air heat-exchanged by the heat exchange element 54 to the outside.

The air supply fan 52 is installed near the indoor air supply port 51B. By driving the air supply fan 52, an air flow path is formed in the casing 51 in which the outdoor air suction port 51A, the heat exchange element 54, and the indoor air supply port 51B sequentially circulate.

The exhaust fan 53 is provided near the exhaust outlet 51D. By driving the exhaust fan 53, an air flow path is formed in the casing 51 in which the exhaust suction port 51C, the heat exchange element 54, and the exhaust blower outlet 51D sequentially circulate.

The heat exchange element 54 exchanges the temperature and humidity between the outside and the inside. The heat exchange element 54 is, for example, a stationary heat exchange element. The heat exchange element 54 is of the orthogonal AC type. The heat exchange element 54 may also be of the counter-flow type.

The control device 55 includes a CPU, RAM, ROM, etc., and controls components such as the air supply fan 52 and the exhaust fan 53 based on information processing. The control device 55 measures the time during which the ventilation unit 50 continues to operate, that is, the continuous operation time. The control device 55 sends the information related to the measured continuous operation time to the control device 36 .

The memory device 56 is composed of a non-volatile memory such as EEPROM (Electrically Erasable Programmable Read-Only Memory). The memory device 56 is communicatively connected to the control device 55 via a bus, for example. The memory device 56 stores the control program. The control program consists of one or multiple programs. The control device 55 controls various components by executing a control program.

The remote controller 57 is installed indoors, for example. The user switches the start and stop of the operation of the ventilation unit 50 by operating the remote control 57 . By operating the remote control 57, the user can set the operation time of the ventilation unit 50, etc.

The air conditioning device 20 further includes a remote control 60 . The user operates the remote control 60 to, for example, switch the operation mode of the air-conditioning device 20 . The operation modes of the air-conditioning device 20 that can be switched by the user operating the remote control 60 include, for example, air-conditioning operation, heating operation, and first dehumidification operation. If the air-conditioning operation is executed, the indoor temperature will drop to the temperature set by the user. If the heating operation is executed, the indoor temperature will rise to the temperature set by the user. If the first dehumidification operation is executed, the indoor humidity will decrease. In the first dehumidification operation, control is performed so that the indoor air humidity does not reach the first threshold XA. The first threshold XA is a humidity value set in such a way that the user will not feel uncomfortable when staying indoors. The first threshold XA is, for example, 65%. The first threshold XA is preferably 55%. The first threshold XA is preferably 45%.

The operation mode of the air-conditioning apparatus 20 further includes a second dehumidification operation as a condensation suppression operation performed to suppress dew condensation on the heat exchange element 54 . The system control unit 70 (refer to FIG. 2 ) of the air-conditioning device 20 automatically executes the dew condensation suppression operation of the second dehumidification operation when the operation start conditions are met. control. Details on the condensation suppression control will be described later. In the following, the second dehumidification operation may be referred to as the dew condensation suppression operation.

When the air-conditioning device 20 performs the cooling operation, the first dehumidification operation, or the second dehumidification operation, the refrigerant circuit RC enters the cooling air circulation state. In the cold air circulation state, the four-way switching valve 42 is in the state shown by the solid line in FIG. 1 . In the cold air circulation state, the refrigerant discharged from the compressor 41 flows through the four-way switching valve 42, the outdoor heat exchanger 43, the electric expansion valve 35, the indoor heat exchanger 31, the four-way switching valve 42, and the pressure accumulator in sequence. 44.

When the air-conditioning device 20 performs heating operation, the refrigerant circuit RC enters the heating circulation state. In the heating circulation state, the four-way switching valve 42 is in the state shown by the dotted line in FIG. 1 . The refrigerant discharged from the compressor 41 flows through the four-way switching valve 42, the indoor heat exchanger 31, the electric expansion valve 35, the outdoor heat exchanger 43, the four-way switching valve 42, and the pressure accumulator 44 in sequence.

FIG. 2 is a diagram for explaining the outline of the system control unit 70. The system control unit 70 includes the control device 36 and the control device 48 .

The control device 36 obtains the detection results of the temperature sensor 33 and the humidity sensor 34 . The control device 36 controls the indoor fan 32 and the electric expansion valve 35 based on all or part of the detection results of the temperature sensor 33 and the humidity sensor 34 . The control device 36 receives a signal indicating the user's instruction from the remote controller 60 . The control device 36 sends a signal for controlling the display state of the screen (not shown) of the remote controller 60 to the remote controller 60 . When the air-conditioning device 20 starts the second dehumidification operation, the control device 36 sends the first signal to the control device 55 (see FIG. 1 ). The control device 36 is used for air conditioning When the device 20 stops the second dehumidification operation, the second signal is sent to the control device 55 .

The control device 48 obtains the detection results of the temperature sensor 46 and the humidity sensor 47 . The control device 48 controls the compressor 41 , the four-way switching valve 42 , and the outdoor fan 45 based on all or part of the detection results of the temperature sensor 46 and the humidity sensor 47 .

The system control unit 70 and the memory device 71 are connected in a communicable manner. The memory device 71 is composed of a non-volatile memory such as EEPROM. The memory device 71 stores the control program 71A. The control program 71A is composed of one or a plurality of programs. The control device 36 and the control device 48 control various components by executing the control program 71A.

<2.Condensation suppression control>

During the dew condensation suppression control, the system control unit 70 of the air-conditioning device 20 executes the dew condensation suppression operation so that the humidity of the indoor air does not reach the second threshold XB when the operation start condition is satisfied. Even when the cooling operation is performed when the operation start conditions are satisfied, the air conditioning device 20 stops the cooling operation and performs the dew condensation suppression operation. When the air-conditioning device 20 is in the stopped state, when the operation start conditions are satisfied, the air-conditioning device 20 starts to perform the dew condensation suppression operation. The second threshold value XB is a value set to suppress dew condensation on the heat exchange element 54 . The second threshold XB is higher than the first threshold XA. The second threshold XB is, for example, 90%. The second threshold XB is preferably 80%. The second threshold XB is preferably 70%. The operation stop state of the air-conditioning apparatus 20 includes, for example, a state in which the power is turned off by sending an operation stop instruction from the remote controller 60 . In another example, the operation stop state of the air-conditioning device 20 includes a state in which the power is turned on but the compressor 41 is temporarily stopped due to thermal shutdown, for example.

The conditions for starting the dew condensation suppression operation include conditions related to indoor air humidity, conditions related to outdoor air humidity, and conditions related to the continuous operation time of the ventilation unit 50 . The conditions related to the indoor air humidity are satisfied when the indoor air humidity detected by the humidity sensor 34 is equal to or higher than the second threshold value XB.

The conditions related to the outdoor air humidity are satisfied when the indoor air humidity detected by the humidity sensor 47 is equal to or higher than the third threshold value XC. The third threshold XC is higher than the first threshold XA. The third threshold XC may be the same as the second threshold XB, or may be different. Even when the indoor air humidity is high, or when the outdoor air humidity is low, condensation is less likely to occur on the heat exchange element 54 . The higher the indoor air humidity and the outdoor air humidity are, and the smaller the difference between the indoor air humidity and the outdoor air humidity is, the easier it is for condensation to occur on the heat exchange element 54 . Therefore, the third threshold XC is preferably the same value as the second threshold XB, or a value close to the second threshold XB.

The conditions related to the continuous operation time of the ventilation unit 50 are satisfied when the continuous operation time of the ventilation unit 50 measured by the control device 55 is equal to or greater than the first specific time TA. The first specific time TA is the time when condensation is predicted to occur on the heat exchange element 54 . The first specific time TA is, for example, 48 hours.

When the air-conditioning apparatus 20 performs the condensation suppression operation under the condensation suppression control, the dew condensation suppression operation is stopped when the operation stop condition is satisfied. The operation stop condition is satisfied when, for example, the time in which the indoor air humidity does not reach the operation stop threshold XZ reaches the second specific time TB. The indoor air humidity measured by the control device 36 does not reach the operation stop threshold XZ. The duration of the state. The operation stop threshold XZ is preferably the same value as the second threshold XB, or a value lower than the second threshold XB. The operation stop threshold XZ may be a value higher than the second threshold XB. The second specific time TB is considered to be the time during which the indoor air humidity remains in a low state and becomes a state in which dew condensation is suppressed on the heat exchange element 54 . The second specific time TB is, for example, 4 hours.

When the condensation suppression operation has been executed under the dew condensation suppression control, the air conditioning system 10 notifies that the condensation suppression operation has been executed. The timing for reporting that the condensation suppression operation has been executed is when the condensation suppression operation is started, in the middle of the condensation suppression operation, or when the condensation suppression operation is stopped. The air conditioning system 10 notifies that the dew condensation suppression operation has been executed, for example, by lighting a lamp provided in the indoor unit 30 . For example, the air conditioning system 10 can notify that the dew condensation suppression operation has been performed by lighting a lamp provided on the housing 51 of the ventilation unit 50 . The air conditioning system 10 can notify the user that the condensation suppression operation has been performed by sending information to the user's mobile terminal. The air conditioning system 10 may also notify that the condensation suppression operation has been performed by sending information to at least one of the remote controller 57 of the ventilation unit 50 and the remote controller 60 of the air conditioning device 20 . When the air-conditioning device 20 is in a stopped state, there is a high possibility that the user is not in the room. Therefore, when the air conditioning system 10 starts to perform the condensation suppression operation from the stopped state, it is preferable to notify the user that the condensation suppression operation has been performed by sending information to the user's mobile terminal.

<3.Fan drive control>

The control device 55 of the ventilation unit 50 executes fan drive control in parallel with the condensation suppression control executed by the system control unit 70 of the air-conditioning device 20 . In the fan drive control, when the control device 55 receives the first signal sent from the control device 36, it controls the air supply fan 52 and the exhaust air volume so that the exhaust air volume from the room is greater than the air supply air volume to the room. Air fan 53. control device When setting 55 receives the first signal, for example, the air supply fan 52 is stopped and the exhaust fan 53 is driven at a higher speed than before the first signal is received. When the control device 55 receives the first signal, for example, it may also stop the air supply fan 52 and drive the exhaust fan 53 to maintain the rotation speed before receiving the first signal. When the control device 55 receives the second signal, the driving state of the air supply fan 52 and the exhaust fan 53 is restored to the state before receiving the first signal.

<4. Processing sequence of condensation suppression control>

An example of the processing sequence of the condensation suppression control will be described with reference to FIG. 3 . The system control unit 70 repeatedly executes the dew condensation suppression control at specific time intervals regardless of whether the air-conditioning device 20 is operating, for example.

In step S11, the control device 36 determines whether the indoor air humidity is above the second threshold XB. When the determination in step S11 is positive, the control device 36 executes the process of step S12. When step S11 is a negative determination, the control device 36 executes the process of step S11 again.

In step S12, the control device 36 determines whether the outdoor air humidity is above the third threshold XC. When the determination in step S12 is affirmative, the system control unit 70 executes the process of step S13. When the determination in step S13 is negative, the system control unit 70 executes the process of step S11 again.

In step S13, the control device 36 determines whether the continuous operation time of the ventilation unit 50 is greater than or equal to the first specific time TA based on the signal sent from the control device 55. A positive determination in step S13 In this case, the control device 36 executes the process of step S14. When the determination in step S13 is negative, the control device 36 executes the process of step S11 again.

In step S14, the system control unit 70 executes the dew condensation suppression operation. The control device 36 sends the first signal to the control device 55 of the ventilation unit 50 . In step S15, the control device 36 notifies the user that the dew condensation suppression operation has been executed.

In step S16, the control device 36 determines whether the duration of the state in which the indoor air humidity does not reach the operation stop threshold XZ reaches the second specific time TB. When the determination in step S16 is positive, the control device 36 executes the process of step S17. When step S16 is a negative determination, the control device 36 executes the process of step S16 again.

In step S17, the system control unit 70 stops the dew condensation suppression operation. The control device 36 sends the second signal to the control device 55 .

<5. Processing sequence of fan drive control of ventilation unit>

Referring to FIG. 4 , an example of a process sequence of fan drive control executed by the control device 55 of the ventilation unit 50 will be described. For example, the control device 55 always performs fan drive control during operation of the ventilation unit 50 . The control device 55 starts fan drive control by sending an operation start instruction from the remote controller 57, for example. The control device 55 ends the fan drive control by sending an operation stop instruction from the remote controller 57 , for example.

In step S21, the control device 55 is driven to achieve a preset rotation speed for ventilation. The air supply fan 52 and the exhaust fan 53 are operated.

In step S22, the control device 55 determines whether the first signal is received, that is, whether the air-conditioning device 20 has started the second dehumidification operation. When the determination in step S22 is positive, the control device 55 executes the process of step S23. When the determination in step S22 is negative, the control device 55 executes the process of step S22 again. In step S23, the control device 55 stops the air supply fan 52.

In step S24, the control device 55 determines whether the second signal is received, that is, whether the air-conditioning device 20 has stopped the second dehumidification operation. When the determination in step S24 is positive, the control device 55 executes the process of step S25. When the determination in step S25 is negative, the control device 55 executes the process of step S24 again.

In step S25, the control device 55 restores the driving status of the air supply fan 52 and the exhaust fan 53 to the status before receiving the first signal.

In step S26, the control device 55 determines whether the operation stop instruction sent from the remote controller 57 is received. When the determination in step S26 is affirmative, the control device 55 ends the fan drive control. When the determination in step S26 is negative, the control device 55 executes the process of step S22 again.

According to the air conditioning system 10, when the operation start conditions are satisfied, the air conditioning device 20 executes the dew condensation suppression operation. Therefore, the indoor air humidity decreases. Because dry air is extracted from indoors to The ventilation unit 50 suppresses dew condensation on the heat exchange element 54 .

According to the air conditioning system 10, since the operation start conditions include both conditions related to indoor air humidity and conditions related to outdoor air humidity, the occurrence of condensation on the heat exchange element 54 can be better suppressed.

Even when the indoor air humidity is high, when the continuous operation time of the ventilation unit 50 is short, dew condensation may not occur on the heat exchange element 54 sometimes. According to the air conditioning system 10, since the operation start conditions include conditions related to the continuous operation time of the ventilation unit 50, the occurrence of dew condensation on the heat exchange element 54 can be better suppressed.

When the operation stop condition is satisfied, the air-conditioning device 20 stops the dew condensation suppression operation. Therefore, the power consumption of the air-conditioning device 20 can be reduced.

When the control device 55 receives the first signal sent from the control device 36, it controls the air supply fan 52 and the exhaust fan 53 so that the exhaust air volume from the room is greater than the air supply air volume to the room. Therefore, the occurrence of condensation on the heat exchange element 54 can be more preferably suppressed.

The ventilation unit 50 stops the air supply fan 52 when receiving the first signal during fan drive control. Therefore, the power consumption of the ventilation unit 50 can be reduced.

When the air conditioning system 10 performs the condensation suppression operation in the dew condensation suppression control, it reports that the condensation suppression operation has been performed. Therefore, convenience is improved.

According to the air conditioning system 10, since the air conditioning device 20 performs the dew condensation suppression operation under a condition where condensation may occur on the heat exchange element 54, the ventilation unit 50 can be maintained in an operating state. Since indoor ventilation can continue, the indoor air can be maintained in a hygienic state.

<6.Example of changes>

The above embodiments are examples of the forms that the air-conditioning system, the control method of the air-conditioning system, and the control program of the air-conditioning system related to the present disclosure can take, and are not intended to limit the forms. The air-conditioning system, the control method of the air-conditioning system, and the control program of the air-conditioning system related to the present disclosure may take forms different from those illustrated in the embodiments. One example is a form in which a part of the components of the embodiment is replaced, changed, or omitted, or a new component is added to the embodiment. Some examples of modifications of the embodiment are shown below.

<6-1>

In the above embodiment, the indoor air humidity is detected by the humidity sensor 34 of the indoor unit 30, but the method of detecting the indoor air humidity can be changed arbitrarily. The indoor air humidity can also be detected by a humidity sensor located near the exhaust inlet 51C in the housing 51 of the ventilation unit 50 . In another example, the indoor air humidity can also be detected by a humidity sensor installed at any position indoors. In this variation, the humidity sensor sends the detection result to the control device 36 at specific intervals, for example.

<6-2>

In the above embodiment, the outdoor air humidity is measured through the humidity sensor 47 of the outdoor unit 40 Detection, but the method of detecting outdoor air humidity can be changed at will. The outdoor air humidity can be detected by a humidity sensor located near the outdoor air inlet 51A in the housing 51 of the ventilation unit 50 . In another example, the outdoor air humidity can also be detected by a humidity sensor installed at any location outdoors.

<6-3>

In the above embodiment, the operation start conditions of the dew condensation suppression control include conditions related to indoor air humidity, conditions related to outdoor air humidity, and conditions related to the continuous operation time of the ventilation unit 50 . The operation start conditions may also only include conditions related to outdoor air humidity. In this variation, in the dew condensation suppression control, steps S11 and S13 shown in FIG. 3 are omitted. The operation start conditions may only include conditions related to indoor air humidity or conditions related to outdoor air humidity. In this variation, in the dew condensation suppression control, step S11, step S12, and step S13 shown in FIG. 3 are omitted.

<6-4>

The conditions related to the indoor air humidity as the operation start conditions can be changed arbitrarily. The conditions related to indoor air humidity may also be satisfied when, for example, the indoor air humidity detected by the humidity sensor 34 is above the fourth threshold XD. The fourth threshold XD is a value determined based on, for example, the indoor temperature and the continuous operation time of the ventilation unit 50 . The fourth threshold XD is a value that becomes lower as the indoor temperature increases. The fourth threshold XD is a value that becomes lower as the continuous operation time of the ventilation unit 50 becomes longer. The control device 36 updates the fourth threshold XD at any time based on a preset relational expression including the indoor temperature and the continuous operation time of the ventilation unit 50 as parameters. The control device 36 executes the process of step S11 of the dew condensation suppression control based on the fourth threshold value XD.

<6-5>

The operation stop conditions can be changed arbitrarily. The operation stop condition may be satisfied when, for example, the time during which the air-conditioning apparatus 20 performs the dew condensation suppression operation reaches the third specific time TC. The third specific time TC is the time when the air humidity in the room is predicted to drop to a level that can inhibit the generation of dew condensation on the heat exchange element 54 .

<6-6>

In the above embodiment, the operation mode of the air-conditioning device 20 includes the cooling operation, the heating operation, the first dehumidification operation, and the dew condensation suppression operation. However, at least one of the heating operation and the first dehumidification operation may be omitted.

<6-7>

In the above embodiment, although the control device 36 has notified the execution of the dew condensation suppression operation, it may also notify the completion of the dew condensation suppression operation.

<6-8>

Although the ventilation unit 50 stops driving the air supply fan 52 in step S22 of the fan drive control, the air supply fan 52 may be driven so that the rotation speed of the air supply fan 52 is lower than the rotation speed of the exhaust fan 53 .

<6-9>

In the above embodiment, the form of the indoor unit 30 is not limited. The indoor unit 30 may be, for example, Ceiling-shaped or wall-mounted.

<6-10>

In the above embodiment, the form of the ventilation unit 50 is not limited. For example, the ventilation unit 50 may be in a ceiling-shaped shape, or may be in an exposed-type shape installed at any location indoors.

<6-11>

In the above embodiment, the air conditioning device 20 includes one indoor unit 30 and one outdoor unit 40 . The number of indoor units 30 and outdoor units 40 included in the air conditioning device 20 is not limited to this. The air conditioning device 20 may include, for example, one outdoor unit 40 and a plurality of indoor units 30 .

Although the embodiment has been described above, it should be understood that various changes in the form or details can be made without departing from the spirit and scope of the patent application.

S11~S17: Steps

Claims (14)

An air conditioning system is provided with: an indoor unit including an indoor heat exchanger; a ventilation unit including a heat exchange element that exchanges heat between indoor air and outdoor air; and a humidity sensor that detects the direction of the heat exchanger. The humidity of the air in the heat exchange element is exchanged; and the indoor mechanism is configured to execute a first dehumidification operation started based on a start instruction from the user, and a second dehumidification operation executed as a condensation suppression operation to suppress condensation on the heat exchange element. operation, the above-mentioned indoor unit controls the air humidity in the above-mentioned room to be less than the first threshold during the above-mentioned first dehumidification operation, and when the air humidity in the above-mentioned room is above the second threshold that is higher than the above-mentioned first threshold, the above-mentioned The above-mentioned second dehumidification operation is performed when the indoor air humidity does not reach the above-mentioned second threshold. For example, in the air conditioning system of claim 1, when the air humidity in the indoor unit of the above-mentioned indoor unit is above the above-mentioned second threshold, and the above-mentioned outdoor air humidity is above the third threshold that is higher than the above-mentioned first threshold, the above-mentioned step is executed 2 Dehumidification operation. If the air conditioning system of claim 1 or 2 is used, when the air humidity of the above-mentioned indoor unit in the above-mentioned room is above the above-mentioned second threshold, and the continuous operation time of the above-mentioned ventilation unit is above the first specific time, the above-mentioned second step is performed. Dehumidification operation. An air conditioning system is provided with: an indoor unit including an indoor heat exchanger; a ventilation unit including a heat exchange element that exchanges heat between indoor air and outdoor air; and a humidity sensor that detects the direction of the heat exchanger. The indoor unit is configured to perform a second dehumidification operation as a dew condensation suppression operation to suppress dew condensation on the heat exchange element. The dew condensation suppression operation uses the indoor heat exchanger as a When the operation of the evaporator is stopped and the operation start condition of the indoor unit is satisfied, the indoor unit is started to start the dew condensation suppression operation. The operation start condition includes the air in the room. Humidity-related conditions, and at least one of the above-mentioned outdoor air humidity-related conditions. The air conditioning system of Claim 4, wherein the operation start conditions include both the conditions related to the indoor air humidity and the conditions related to the outdoor air humidity. Such as the air conditioning system of claim 4 or 5, wherein the above-mentioned operation start conditions further include conditions related to the continuous operation time of the above-mentioned ventilation unit. The air conditioning system of Claim 1 or 4, wherein the indoor unit is executing the condensation suppression operation when the duration of the state in which the indoor air humidity does not reach the operation stop threshold reaches the second specific time, or, The time for executing the above condensation suppression operation reaches the third specified time, stop the above-mentioned condensation suppression operation. The air conditioning system according to claim 1 or 4, wherein the ventilation unit includes an air supply fan that supplies air to the indoor space and an exhaust fan that discharges air from the indoor space. The air supply fan and the exhaust fan When the above-mentioned indoor unit performs the above-mentioned condensation suppression operation, the exhaust air volume is controlled in such a manner that it exceeds the supply air volume. The air-conditioning system according to claim 8, wherein when the indoor unit performs the dew condensation suppression operation, the exhaust fan is controlled to be driven while the air supply fan is stopped. The air conditioning system of claim 1 or 4, wherein when the indoor unit executes the dew condensation suppressing operation, it is reported that the dew condensing suppressing operation has been executed. A control method for an air conditioning system, which is provided with: an indoor unit including an indoor heat exchanger, a ventilation unit including a heat exchange element for heat exchange between indoor air and outdoor air, and a sensor that detects the direction of the heat exchange element. A humidity sensor of air humidity, and the indoor mechanism is configured to execute a first dehumidification operation started based on a start instruction from a user, and a second dew condensation suppression operation executed to suppress dew condensation on the heat exchange element. 2. Dehumidification operation, and the control method of the above-mentioned air conditioning system includes: causing the above-mentioned indoor unit to perform the above-mentioned first dehumidification operation in such a manner that the air humidity in the above-mentioned room does not reach the first threshold; and the air humidity in the above-mentioned room is higher than the above-mentioned first threshold. Situations above the second threshold of the threshold When the indoor air humidity does not reach the second threshold, the indoor unit is caused to perform the second dehumidification operation. A control program for an air conditioning system. The air conditioning system is provided with: an indoor unit including an indoor heat exchanger, a ventilation unit including a heat exchange element that heats indoor air and outdoor air, and a sensor that detects the direction of the heat exchange element. A humidity sensor of air humidity, and the indoor mechanism is configured to execute a first dehumidification operation started based on a start instruction from a user, and a second dew condensation suppression operation executed to suppress dew condensation on the heat exchange element. 2. Dehumidification operation, and the control program of the above-mentioned air-conditioning system causes the computer to perform the following processing: causing the above-mentioned indoor unit to perform the above-mentioned first dehumidification operation in such a manner that the humidity of the air in the above-mentioned room does not reach the first threshold; and the humidity of the air in the above-mentioned room is In the case of a second threshold value higher than the above-mentioned first threshold value, the indoor unit is caused to perform the above-mentioned second dehumidification operation so that the humidity of the indoor air does not reach the above-mentioned second threshold value. A control method for an air conditioning system, which is provided with: an indoor unit including an indoor heat exchanger, a ventilation unit including a heat exchange element for heat exchange between indoor air and outdoor air, and a sensor that detects the direction of the heat exchange element. a humidity sensor of air humidity, and the indoor unit is configured to perform a second dehumidification operation as a condensation suppression operation for suppressing dew condensation on the heat exchange element. The condensation suppression operation is to convert the indoor heat exchange element into a second dehumidification operation. The air-conditioning system operates as an evaporator, and the control method of the above-mentioned air-conditioning system includes: when the operation of the above-mentioned indoor unit is in a stopped state, when the operation of the above-mentioned indoor unit is satisfied. When the start condition is turned, the indoor unit is started to start the dew condensation suppression operation, and the operation start condition includes at least one of a condition related to the indoor air humidity and a condition related to the outdoor air humidity. A control program for an air conditioning system. The air conditioning system is provided with: an indoor unit including an indoor heat exchanger, a ventilation unit including a heat exchange element that heats indoor air and outdoor air, and a sensor that detects the direction of the heat exchange element. a humidity sensor of air humidity, and the indoor unit is configured to perform a second dehumidification operation as a condensation suppression operation for suppressing dew condensation on the heat exchange element. The condensation suppression operation is to convert the indoor heat exchange element into a second dehumidification operation. The control program of the above-mentioned air-conditioning system includes causing the computer to perform the following processing: when the operation of the above-mentioned indoor unit is in a stopped state, when the conditions for starting the operation of the above-mentioned indoor unit are met, the above-mentioned indoor unit is started. The indoor unit is caused to start the dew condensation suppressing operation, and the operation starting conditions include at least one of the conditions related to the indoor air humidity and the conditions related to the outdoor air humidity.