TW202246708A - Air-conditioning system, control method for air-conditioning system, and control program for air-conditioning system - Google Patents

Abstract

Provided are an air-conditioning system, a control method for the air-conditioning system, and a control program for the air-conditioning system with which the occurrence of condensation in a heat exchange element of a ventilation unit can be suppressed. An air-conditioning system is provided with 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 humidity sensors for detecting the humidity of air heading toward the heat exchange element. The indoor unit is configured to execute a first dehumidification operation that starts on the basis of a start instruction from a user, and a second dehumidification operation that is a condensation suppression operation executed to suppress condensation in the heat exchange element. The indoor unit controls the humidity of indoor air to be less than a first threshold value during the first dehumidification operation, and, when the humidity of the indoor air is equal to or greater than a second threshold value higher than the first threshold value, executes the second dehumidification operation so that the humidity of the indoor air becomes less than the second threshold value.

Description

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

The 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 and ventilation device that performs integral ventilation of total heat exchange and ventilation. The heat exchange and ventilation device includes: a heat exchanger; a body frame supporting the heat exchanger; and a liquid receiving member disposed below the heat exchanger in the body frame. In this heat exchange ventilator, water adhering to the heat exchanger due to dew condensation is dripped toward the liquid receiving member. [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2011-144995

[Problem to be solved by the invention]

In the above-mentioned heat exchange and ventilation device, although the water generated by dew condensation can be treated, no research has been conducted on the point of suppressing the generation of dew condensation itself.

The purpose of the present disclosure is to provide an air conditioning system capable of suppressing condensation on the heat exchange element of the ventilation unit, a control method of the air conditioning system, and a control program of the air conditioning system. [Technical means to solve the problem]

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

In the above-mentioned air-conditioning system, when the indoor air humidity of the indoor unit is equal to or higher than the second threshold, and the outdoor air humidity is equal to or higher than the third threshold higher than the first threshold, the above-mentioned 2nd dehumidification operation. According to the air conditioning system, it is possible to better suppress condensation on the heat exchanging element of the ventilation unit.

In the above-mentioned air-conditioning system, the second dehumidification may be performed when the indoor air humidity of the indoor unit is equal to or greater than the second threshold and the continuous operation time of the ventilation unit is equal to or greater than the first specific time. run. According to the air conditioning system, it is possible to better suppress condensation on the heat exchanging element of the ventilation unit.

The air conditioning system of the present disclosure includes: an indoor unit including an indoor heat exchanger; a ventilation unit including a heat exchanging element for exchanging heat between indoor air and outdoor air; The humidity of the air in the exchanging element; the above-mentioned indoor unit is configured to perform the second dehumidification operation as the condensation suppression operation performed to suppress the condensation of the heat exchange element, and the condensation suppression operation uses the above-mentioned indoor heat exchanger as an evaporation When the operation of the above-mentioned indoor unit is stopped, the above-mentioned indoor unit starts to start the above-mentioned condensation suppression operation when the operation start condition of the above-mentioned indoor unit is satisfied. The above-mentioned operation start condition includes the air humidity in the above-mentioned room. conditions, and at least one of the conditions related to the above-mentioned outdoor air humidity. According to this air conditioning system, it is possible to suppress condensation on the heat exchange element of the ventilation unit.

In the above-mentioned 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 the air conditioning system, it is possible to better suppress condensation on the heat exchanging element of the ventilation unit.

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 the air conditioning system, it is possible to better suppress condensation on the heat exchanging element of the ventilation unit.

In the above-mentioned air-conditioning system, when the above-mentioned indoor unit is performing the above-mentioned dew condensation suppression operation, when the time in which the air humidity in the above-mentioned room has not reached the operation stop threshold value lasts for a second specific time, or When the time of the dew condensation suppressing operation reaches the third specific time, the dew condensation suppressing operation is stopped. According to this air conditioning system, the power consumption of the indoor unit can be reduced.

In the above-mentioned air-conditioning system, the above-mentioned ventilation unit may include an air supply fan for supplying air to the above-mentioned room, and an exhaust fan for exhausting air from the above-mentioned room, and the above-mentioned air supply fan and the above-mentioned exhaust fan are implemented in the above-mentioned indoor unit. In the case of the above-mentioned dew condensation suppression operation, it is controlled in such a way that the exhaust air volume is greater than the air supply air volume. According to the air conditioning system, it is possible to better suppress condensation on the heat exchanging element of the ventilation unit.

In the above-mentioned air-conditioning system, when the above-mentioned indoor unit is performing the above-mentioned dew condensation suppression operation, the control may be performed so that the above-mentioned exhaust fan is driven while 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 notified 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 herein is a control method of the air conditioning system, the air conditioning system 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 humidity of the air facing the heat exchange element, and the indoor mechanism is configured to perform 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 dew condensation suppression operation performed, and the control method of the air conditioning system includes: making the indoor unit perform the first dehumidification operation in such a way that the air humidity in the room does not reach the first threshold value; and the air in the room When the humidity is higher than the second threshold value above the first threshold value, the indoor unit performs the second dehumidification operation so that the air humidity in the room does not reach the second threshold value. According to the control method of the air conditioning system, it is possible to suppress condensation on the heat exchanging element of the ventilation unit.

The control program of the air conditioning system disclosed in this disclosure is the control program of the air conditioning system. The air conditioning system 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 humidity of the air facing the heat exchange element, and the indoor mechanism is configured to perform 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 dew condensation suppression operation is performed, and the control program of the air-conditioning system causes the computer to perform the following processing: make the indoor unit perform the first dehumidification operation in a manner that the air humidity in the above-mentioned room does not reach the first threshold value; and When the indoor air humidity is higher than the second threshold value above the first threshold value, the indoor unit performs the second dehumidification operation so that the indoor air humidity does not reach the second threshold value. According to the control program of the air-conditioning system, condensation on the heat exchange element of the ventilation unit can be suppressed.

The control method of the air conditioning system disclosed herein is a control method of the air conditioning system, the air conditioning system 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 for detecting 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 performed to suppress condensation of the heat exchange element, the condensation suppression The operation refers to the operation using the above-mentioned indoor heat exchanger 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 stopped, when the operation start condition of the above-mentioned indoor unit is satisfied, start the above-mentioned The indoor unit causes the indoor unit to start the dew condensation suppression operation, and the operation start condition includes at least one of conditions related to the indoor air humidity and the outdoor air humidity. According to the control method of the air conditioning system, it is possible to suppress condensation on the heat exchanging element of the ventilation unit.

The control program of the air conditioning system disclosed in this disclosure is the control program of the air conditioning system. The air conditioning system 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 for detecting 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 performed to suppress condensation of the heat exchange element, the condensation suppression The operation refers to the operation using the above-mentioned indoor heat exchanger 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 stopped, when the above-mentioned indoor unit is satisfied, the operation of the above-mentioned indoor unit is started. In the condition, the indoor unit is activated to start the dew condensation suppression operation, and the operation start condition includes at least one of conditions related to the indoor air humidity and the outdoor air humidity. According to the control program of the air-conditioning system, condensation on the heat exchange element of the ventilation unit can be suppressed.

Hereinafter, the present embodiment will be described with reference to the drawings. In addition, the same symbols are assigned to the same or corresponding parts in the drawings, and the same descriptions will not be repeated.

＜1. Composition of air conditioning system＞ Fig. 1 is a diagram showing a schematic configuration of an air-conditioning system 10 according to the present embodiment. The air conditioning system 10 is applied to any building. The buildings are, for example, individual houses, collective houses, or commercial facilities. The air conditioning system 10 includes an air conditioner 20 and a ventilation unit 50 . The air conditioner 20 includes an indoor unit 30 and an outdoor unit 40 . The indoor unit 30 is installed, for example, behind a ceiling in a building. The outdoor unit 40 is installed outdoors. The ventilation unit 50 is installed behind a ceiling, for example, in a building. 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 accommodated in the housing 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 the 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: Central Processing Unit), RAM (Random Access Memory: Random Access Memory), and ROM (Read Only Memory: Read Only Memory), etc., and controls the indoor fan 32 etc. according to 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 of 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 a 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 between the cooling cycle state and the heating cycle 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 cycle 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, and ROM, etc., and controls components such as the compressor 41, the four-way switching valve 42, and the outdoor fan 45 based on information processing. The control device 48 constitutes a part of a system control unit 70 (see FIG. 2 ).

In the air conditioner 20, the refrigerant circuit is constituted by connecting 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 accumulator 44 in a ring. RC.

The ventilation unit 50 includes a casing 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 controller 57 .

The casing 51 is, for example, box-shaped, and houses the air supply fan 52 , the exhaust fan 53 , and the heat exchange element 54 . The casing 51 includes an outside air intake port 51A, an indoor air supply port 51B, an exhaust intake port 51C, and an exhaust blowing port 51D.

The outside air inlet 51A is for passing the air flowing into the housing 51 from the outside. A suction pipe 81 for taking outdoor air into the casing 51 is connected to the outside air suction port 51A. The indoor air supply port 51B passes the air heat-exchanged by the heat exchange element 54 . A supply pipe 82 for supplying the air heat-exchanged by the heat exchange element 54 into the room is connected to the indoor air supply port 51B. The exhaust suction port 51C passes the air flowing from the room into the casing 51 . A suction pipe 83 for taking indoor air into the casing 51 is connected to the exhaust suction port 51C. The exhaust outlet 51D passes the air heat-exchanged by the heat exchange element 54 . An exhaust pipe 84 for exhausting the air heat-exchanged by the heat exchange element 54 to the outside is connected to the exhaust outlet 51D.

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

The exhaust fan 53 is provided near the exhaust outlet 51D. By driving the exhaust fan 53 , an air flow path through which the exhaust air inlet 51C, the heat exchange element 54 , and the exhaust air outlet 51D flow sequentially is formed in the housing 51 .

The heat exchange element 54 exchanges the temperature and humidity between the outdoor and indoor. The heat exchange element 54 is, for example, a stationary heat exchange element. The heat exchange element 54 is of the cross-flow type. The heat exchange element 54 may also be of the counterflow type.

The control device 55 includes a CPU, RAM, and 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 operates continuously, that is, the continuous operation time. The control device 55 sends 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: Electronically Erasable Programmable Read-Only Memory). The memory device 56 is communicably connected to the control device 55 , for example via a bus bar. The memory device 56 memorizes the control program. A control program consists of one or more programs. The control device 55 controls various components by executing the control program.

The remote controller 57 is installed indoors, for example. The user switches between starting and stopping the operation of the ventilation unit 50 by operating the remote controller 57 . The user can set the operation time of the ventilation unit 50 and the like by operating the remote controller 57 .

The air conditioner 20 further includes a remote controller 60 . By operating the remote controller 60 , the user switches, for example, the operation mode of the air conditioner 20 . The operation modes of the air conditioner 20 that can be switched by the user's operation of the remote controller 60 include, for example, cooling operation, heating operation, and first dehumidification operation. If the air-conditioning operation is performed, the indoor temperature drops to the temperature set by the user. If the heating operation is performed, the indoor temperature rises to the temperature set by the user. If the first dehumidification operation is performed, the indoor humidity will decrease. In the first dehumidification operation, control is performed so that the humidity of the air in the room does not reach the first threshold value XA. The first threshold value XA is a humidity value set so that the user does not feel uncomfortable when staying indoors. The first threshold XA is, for example, 65%. The first threshold XA is preferably 55%. More preferably, the first threshold XA is 45%.

The operation mode of the air conditioner 20 further includes a second dehumidification operation as a dew condensation suppression operation executed to suppress dew condensation on the heat exchange element 54 . The system control unit 70 (see FIG. 2 ) of the air conditioner 20 executes dew condensation suppression control that automatically executes the second dehumidification operation when the operation start condition is satisfied. Details about the condensation suppression control will be described later. In addition, hereinafter, the second dehumidification operation may be referred to as dew condensation suppression operation.

When the air conditioner 20 is performing the cooling operation, the first dehumidification operation, or the second dehumidification operation, the refrigerant circuit RC is in a cooling cycle 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 accumulator in sequence 44.

When the air conditioner 20 is performing a heating operation, the refrigerant circuit RC is in a heating cycle state. In the heating cycle 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 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 from the remote controller 60 to display the user's instruction. The control device 36 sends a signal to the remote controller 60 to control the display state of the screen (not shown) of the remote controller 60 . The control device 36 sends the first signal to the control device 55 (see FIG. 1 ) when the air conditioner 20 starts the second dehumidification operation. The control device 36 sends the second signal to the control device 55 when the air conditioner 20 stops the second dehumidification operation.

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 is communicably connected to the memory device 71 . The memory device 71 is constituted by a non-volatile memory such as EEPROM, for example. The storage device 71 stores the control program 71A. The control program 71A consists 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> The system control unit 70 of the air conditioner 20 executes the condensation suppression operation so that the humidity of the room air does not reach the second threshold value XB when the operation start condition is satisfied during the condensation suppression control. Even when the cooling operation is performed when the operation start condition is satisfied, the air conditioner 20 stops the cooling operation and performs the dew condensation suppression operation. When the air-conditioning apparatus 20 is in an operation stop state, when the operation start condition is satisfied, the air-conditioning apparatus 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 more preferably 70%. The operation stop state of the air conditioner 20 includes, for example, a state in which the power supply is turned off by sending an operation stop instruction from the remote controller 60 . In another example, the stop state of the air conditioner 20 includes a state in which the power supply is turned on, but the drive of the compressor 41 is temporarily stopped due to thermal shutdown, for example.

The operation start conditions of 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 greater 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 greater 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 or different from the second threshold XB. Even when the indoor air humidity is high, and the outdoor air humidity is low, it is not easy for the heat exchange element 54 to condense. The higher the indoor air humidity and the higher outdoor air humidity, and the smaller the difference between the indoor air humidity and the outdoor air humidity, the easier it is to generate condensation 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 longer than the first specific time TA. The first specific time TA is the time when dew condensation is expected to occur on the heat exchange element 54 . The first specific time TA is, for example, 48 hours.

The air conditioner 20 stops the condensation suppression operation when the operation stop condition is satisfied when the condensation suppression operation is performed under the condensation suppression control. The operation stop condition is satisfied, for example, when the time period in which the indoor air humidity is below the operation stop threshold value XZ reaches the second specific time TB. The control device 36 measures the duration of the state in which the indoor air humidity does not reach the operation stop threshold value XZ. 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 heat exchange element 54 is in a state where dew condensation is suppressed as the indoor air humidity continues to be in a low state. The second specific time TB is, for example, 4 hours.

The air-conditioning system 10 notifies that the condensation suppression operation has been executed when the condensation suppression operation has been executed under the condensation suppression control. The timing of notifying that the dew condensation suppression operation has been executed is when the dew condensation suppression operation is started, during execution of the dew condensation suppression operation, or when the dew condensation suppression operation is stopped. The air conditioning system 10 notifies that the dew condensation suppression operation has been performed, for example, by turning on a lamp provided in the indoor unit 30 . The air-conditioning system 10 can notify that the dew condensation suppression operation has been performed, for example, by turning on a lamp provided on the casing 51 of the ventilation unit 50 . The air conditioning system 10 can notify that the dew condensation suppression operation has been executed by sending information to the user's mobile terminal. The air conditioning system 10 can also notify that the dew condensation suppression operation has been executed 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 apparatus 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 dew condensation suppression operation from the stop state, it is preferable to notify that the dew condensation suppression operation has been executed by sending information to the user's mobile terminal.

＜3. Fan drive control＞ The control device 55 of the ventilation unit 50 executes the fan drive control in parallel with the dew condensation suppression control executed by the system control unit 70 of the air conditioner 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 fan in such a way that the exhaust air volume from the room is greater than the air supply air volume to the room. Air fan 53. When the control device 55 receives the first signal, for example, the air supply fan 52 is stopped, and the exhaust fan 53 is driven at a higher rotational speed than before receiving the first signal. When the control device 55 receives the first signal, for example, the air supply fan 52 may be stopped, and the exhaust fan 53 may be driven to maintain the number of rotations before the first signal was received. When the control device 55 receives the second signal, the drive state of the air supply fan 52 and the exhaust fan 53 is restored to the state before receiving the first signal.

<4. Processing procedure of condensation suppression control> An example of the processing procedure of the dew condensation suppression control will be described with reference to FIG. 3 . The system control unit 70 repeatedly executes the dew condensation suppression control at predetermined time intervals regardless of whether the air conditioner 20 is operating or not.

In step S11, the control device 36 determines whether the indoor air humidity is equal to or greater than the second threshold value XB. In the case of an affirmative determination in step S11, the control device 36 executes the processing of step S12. In the case of negative determination in step S11, the control device 36 executes the processing of step S11 again.

In step S12, the control device 36 determines whether the outdoor air humidity is equal to or greater than the third threshold value XC. In the case of an affirmative determination in step S12, the system control unit 70 executes the process of step S13. In the case of negative determination in step S13, the system control unit 70 executes the process of step S11 again.

In step S13 , the control device 36 determines whether or not the continuous operation time of the ventilation unit 50 is longer than or equal to the first specific time TA based on the signal sent from the control device 55 . In the case of an affirmative determination in step S13, the control device 36 executes the processing of step S14. In the case of negative determination in step S13, 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 or not the time in which the indoor air humidity has not reached the operation stop threshold XZ has reached the second specific time TB. In the case of an affirmative determination in step S16, the control device 36 executes the processing of step S17. In the case of negative determination in step S16, 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 the processing procedure of the fan drive control executed by the control device 55 of the ventilation unit 50 will be described. The control device 55 always executes the fan drive control during the operation of the ventilation unit 50, for example. For example, the control device 55 starts fan drive control by transmitting an operation start instruction from the remote controller 57 . For example, the control device 55 terminates the fan drive control by sending an operation stop instruction from the remote controller 57 .

In step S21, the control device 55 drives the air supply fan 52 and the exhaust fan 53 so as to have a preset rotation speed for ventilation.

In step S22, the control apparatus 55 judges whether the 1st signal was received, ie, whether the air conditioner 20 has started the 2nd dehumidification operation. In the case of an affirmative determination in step S22, the control device 55 executes the processing of step S23. In the case of negative determination in step S22, 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 apparatus 55 judges whether the 2nd signal was received, ie, whether the air conditioner 20 stopped the 2nd dehumidification operation. In the case of an affirmative determination in step S24, the control device 55 executes the processing of step S25. In the case of negative determination in step S25, the control device 55 executes the process of step S24 again.

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

In step S26 , the control device 55 determines whether or not an operation stop instruction sent from the remote controller 57 has been received. In the case of an affirmative determination in step S26, the control device 55 ends the fan drive control. In the case of negative determination in step S26, the control device 55 executes the process of step S22 again.

According to the air conditioning system 10 , when the operation start condition is satisfied, the air conditioner 20 executes the dew condensation suppression operation. Therefore, the indoor air humidity is reduced. Since the dry air is extracted from the room to the air blowing unit 50, condensation on the heat exchange element 54 is suppressed.

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, generation of dew condensation on the heat exchange element 54 can be suppressed more preferably.

Even when the indoor air humidity is relatively high, when the continuous operation time of the ventilation unit 50 is short, sometimes condensation does not occur on the heat exchange element 54 . 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 , it is possible to more preferably suppress the generation of dew condensation on the heat exchange element 54 .

The air conditioner 20 stops the dew condensation suppressing operation when the operation stop condition is satisfied. Therefore, the power consumption of the air conditioner 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, dew condensation on the heat exchange element 54 can be suppressed more preferably.

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

The air-conditioning system 10 notifies that the condensation suppression operation has been executed when the condensation suppression operation is executed during the condensation suppression control. Therefore, convenience is improved.

According to the air conditioning system 10, since the air conditioner 20 performs the dew condensation suppression operation under the condition that condensation may be generated on the heat exchanging element 54, the operating state of the ventilation unit 50 can be maintained. Since the indoor ventilation can be continued, the indoor air can be kept in a hygienic state.

＜6. Variations＞ The above-mentioned embodiments are examples of possible forms of the air-conditioning system, the control method of the air-conditioning system, and the control program of the air-conditioning system related to this disclosure, 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 an aspect in which a part of the configuration of the embodiment is replaced, changed, or omitted, or a configuration in which a new configuration is added to the embodiment. Some examples of modification examples of the embodiment are shown below.

<6-1> In the above embodiment, although the indoor air humidity is detected by the humidity sensor 34 of the indoor unit 30, the method of detecting the indoor air humidity can be changed arbitrarily. The indoor air humidity can also be detected by a humidity sensor disposed near the exhaust suction port 51C in the casing 51 of the ventilation unit 50 . In another example, the indoor air humidity can also be detected by a humidity sensor installed anywhere in the room. In this variation example, the humidity sensor sends the detection result to the control device 36 at specific time intervals, for example.

<6-2> In the above embodiment, although the outdoor air humidity is detected by the humidity sensor 47 of the outdoor unit 40, the method of detecting the outdoor air humidity can be changed arbitrarily. The humidity of the outdoor air can be detected by a humidity sensor disposed near the outside 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 position outdoors.

<6-3> In the above embodiment, the operation start conditions of the 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 only include conditions related to outdoor air humidity. In this modification, in the dew condensation suppression control, steps S11 and S13 shown in FIG. 3 are omitted. The operation start conditions may include only conditions related to indoor air humidity or conditions related to outdoor air humidity. In this modification, in the dew condensation suppression control, step S11 or step S12 and step S13 shown in FIG. 3 are omitted.

<6-4> The conditions related to the indoor air humidity of the operation start condition can be changed arbitrarily. The conditions related to the indoor air humidity can also be satisfied, for example, when the indoor air humidity detected by the humidity sensor 34 is equal to or higher than the fourth threshold value XD. The fourth threshold value 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 value XD is a value that becomes lower as the indoor temperature becomes higher. The fourth threshold value 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 value XD at any time based on the preset relational expression including the indoor temperature and the continuous operating 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, for example, when 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 indoor air humidity is expected to drop to such a level that condensation on the heat exchange element 54 can be suppressed.

<6-6> In the above embodiment, the operation modes of the air conditioner 20 include cooling operation, heating operation, first dehumidification operation, and dew condensation suppression operation, but at least one of the heating operation and the first dehumidification operation may be omitted.

<6-7> In the above-mentioned embodiment, although the control device 36 has notified that the dew condensation suppression operation is executed, it may also notify that the dew condensation suppression operation has been completed.

<6-8> Although the ventilation unit 50 stops the drive of the air supply fan 52 in step S22 of the fan drive control, the air supply fan 52 may be driven at a lower speed than the exhaust fan 53 .

<6-9> In the above embodiments, the form of the indoor unit 30 is not limited. The indoor unit 30 may be, for example, a ceiling-mounted type or a wall-mounted type.

<6-10> In the above embodiments, the form of the ventilation unit 50 is not limited. The ventilation unit 50 may also be, for example, a ceiling shape, or an exposed shape installed in any part of the room.

<6-11> In the above embodiment, the air conditioner 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 conditioner 20 is not limited to this. The air conditioner 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 and details can be made without departing from the gist and scope of the claims.

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: Accumulator 45:Outdoor fan 46:Temperature sensor 47:Humidity sensor 48: Control device 50: ventilation unit 51: shell 51A: External air suction port 51B: Indoor air supply port 51C: Exhaust suction port 51D: Exhaust 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 pipe 82: supply pipe 83: suction pipe 84: exhaust pipe RC: refrigerant circuit S11～S17: Steps S21～S26: Steps

Fig. 1 is a diagram showing a schematic configuration of an air-conditioning system according to an embodiment. Fig. 2 is a diagram showing a schematic configuration of a system control unit. Fig. 3 is a flowchart showing an example of the processing procedure of dew condensation suppression control. FIG. 4 is a flow chart showing an example of the processing procedure of fan drive control.

S11~S17: Steps

Claims (14)

An air conditioning system comprising: an indoor unit comprising an indoor heat exchanger; A ventilation unit comprising a heat exchange element for exchanging heat 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 performs a first dehumidification operation started based on a start instruction from a user, and a second dehumidification operation as a dew condensation suppression operation performed to suppress dew condensation on the heat exchange element, The above indoor unit During the above-mentioned first dehumidification operation, the air humidity in the above-mentioned room is controlled so as not to reach the first threshold value, When the indoor air humidity is higher than the second threshold value above the first threshold value, the second dehumidification operation is performed so that the indoor air humidity does not reach the second threshold value. The air-conditioning system according to claim 1, wherein when the indoor air humidity of the indoor unit is above the second threshold, and the outdoor air humidity is above the third threshold higher than the first threshold, the above first threshold is executed. 2 dehumidification operation. The air-conditioning system according to claim 1 or 2, wherein when the indoor air humidity of the indoor unit is above the second threshold and the continuous operation time of the ventilation unit is above the first specific time, the above-mentioned second Dehumidification operation. An air conditioning system comprising: an indoor unit comprising an indoor heat exchanger; A ventilation unit comprising a heat exchange element for exchanging heat 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 unit is configured to perform a second dehumidification operation as a condensation suppression operation performed to suppress condensation of the heat exchange element, The dew condensation suppression operation mentioned above is an operation using the indoor heat exchanger as an evaporator, When the operation of the indoor unit is stopped, when the operation start condition of the indoor unit is satisfied, the indoor unit is started and the dew condensation suppression operation is started, The operation start conditions include at least one of conditions related to the indoor air humidity and conditions related to the outdoor air humidity. The air conditioning system according to 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. The air-conditioning system according to 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 according to claim 1 or 4, wherein when the indoor unit is performing the dew condensation suppression operation, the time in which the indoor air humidity has not reached the operation stop threshold continues for a second specific time, or, When the time during which the dew condensation suppression operation is performed reaches a third specific time, the dew condensation suppression operation is stopped. The air-conditioning system according to any one of claim 1 or 4, wherein the ventilation unit includes an air supply fan for supplying air to the above-mentioned room, and an exhaust fan for exhausting air from the above-mentioned room, The air supply fan and the exhaust fan are controlled so that the exhaust air volume is greater than the air supply air volume when the indoor unit is performing the dew condensation suppression operation. The air conditioning system according to claim 8, wherein when the indoor unit is performing the dew condensation suppression operation, the exhaust fan is controlled to be driven while the air supply fan is stopped. The air conditioning system according to claim 1 or 4, wherein when the indoor unit executes the condensation suppression operation, it is reported that the condensation suppression operation has been executed. A method for controlling an air conditioning system, the air conditioning system comprising: an indoor unit including an indoor heat exchanger, a ventilation unit including a heat exchanging element for exchanging heat between indoor air and outdoor air, and detecting a humidity sensor for the humidity of the air, and The indoor unit executes a first dehumidification operation started based on a start instruction from a user, and a second dehumidification operation as a dew condensation suppression operation performed to suppress dew condensation of the heat exchange element, and the control of the air conditioning system Methods include: Make the above-mentioned indoor unit perform the above-mentioned first dehumidification operation in such a way that the air humidity in the above-mentioned room does not reach the first threshold value; and When the indoor air humidity is higher than the second threshold above the first threshold, the indoor unit performs the second dehumidification operation so that the indoor air humidity does not reach the second threshold. A control program for an air conditioning system comprising: an indoor unit including an indoor heat exchanger, a ventilation unit including a heat exchanging element for exchanging heat between indoor air and outdoor air, and detecting a humidity sensor for the humidity of the air, and The indoor unit executes a first dehumidification operation started based on a start instruction from a user, and a second dehumidification operation as a dew condensation suppression operation performed to suppress dew condensation of the heat exchange element, and the control of the air conditioning system The program causes the computer to perform the following processes: Make the above-mentioned indoor unit 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 value; and When the humidity of the indoor air is higher than the second threshold above the first threshold, the indoor unit performs the second dehumidification operation so that the humidity of the indoor air does not reach the second threshold. A method for controlling an air conditioning system, the air conditioning system comprising: an indoor unit including an indoor heat exchanger, a ventilation unit including a heat exchanging element for exchanging heat between indoor air and outdoor air, and detecting a humidity sensor for the humidity of the air, and The indoor unit is configured to perform a second dehumidification operation as a condensation suppression operation performed to suppress condensation of the heat exchange element, The aforementioned dew condensation suppression operation is an operation using the aforementioned indoor heat exchanger as an evaporator, and the control method of the aforementioned air conditioning system includes: When the operation of the indoor unit is stopped, when the operation start condition of the indoor unit is satisfied, the indoor unit is activated so that the indoor unit starts the dew condensation suppression operation, and The operation start conditions include at least one of conditions related to the indoor air humidity and conditions related to the outdoor air humidity. A control program for an air conditioning system comprising: an indoor unit including an indoor heat exchanger, a ventilation unit including a heat exchanging element for exchanging heat between indoor air and outdoor air, and detecting a humidity sensor for the humidity of the air, and The indoor unit is configured to perform a second dehumidification operation as a condensation suppression operation performed to suppress condensation of the heat exchange element, The above-mentioned dew condensation suppression operation is an operation using the above-mentioned indoor heat exchanger as an evaporator, and the control program of the above-mentioned air-conditioning system includes causing the computer to execute the following processes: When the operation of the indoor unit is stopped, when the operation start condition of the indoor unit is satisfied, the indoor unit is activated so that the indoor unit starts the dew condensation suppression operation, and The operation start conditions include at least one of conditions related to the indoor air humidity and conditions related to the outdoor air humidity.

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