Ventilation system and prediction measure of dew condensation

Abstract

To acquire a ventilation system which can prevent generation of dew condensation on a window beforehand, by predicting dew condensation on the window and changing an operation state of the ventilation system.SOLUTION: A ventilation system 100a includes: a ventilation fan 20 for performing ventilation in a room including a window; an environmental information acquisition part for detecting environmental information which is the information regarding the environment of the air around the window; and a determination part 2 which predicts generation of dew condensation on the window at future first time, based on a prediction value of the surface temperature of the window at the future first time and a prediction value of a dew point temperature of the indoor air at the future first time, calculated based on the environmental information detected by the environmental information acquisition part. In the case where generation of dew condensation on the window at the first time is predicted, the determination part 2 controls first dew condensation suppression operation mode in which an exhaust air amount of the ventilation fan is increased at second time before the first time. The ventilation system 100a can prevent generation of dew condensation on the window automatically beforehand, without troubling a human.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a ventilation system capable of preventing condensation on windows of a building and a method for predicting condensation. [Background technology]

[0002] As a conventional ventilation system, Patent Document 1 describes a ventilation system equipped with a calculation means for calculating the amount of water vapor contained in the room from the relationship between the temperature detected by a temperature detection means and the humidity detected by a humidity detection means, and calculating the temperature difference at which the water vapor becomes saturated and condensation occurs. When the calculation means determines that the temperature difference is such that condensation will occur, the ventilation system exhausts or supplies air using a fan to prevent condensation in the room.

[0003] Patent document 2 describes a condensation prediction system that estimates the window surface temperature based on the indoor temperature predicted by a prediction means, the forecasted outside temperature, and the virtual thermal transmittance of the window, and is equipped with a risk determination means that uses the estimated window surface temperature to determine whether or not there is a risk of condensation on the window. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-63251 A [Patent Document 2] Patent Publication No. 2021-6755 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the ventilation system described in Patent Document 1 has a problem in that it switches to an operation for preventing condensation after condensation occurs indoors, and is not sufficient to prevent condensation on windows in advance.

[0006] Furthermore, the condensation prediction system described in Patent Document 2 has the problem that it is only capable of predicting condensation on windows and is not capable of preventing condensation on windows.

[0007] The present disclosure has been made in consideration of the above, and aims to provide a ventilation system that can predict condensation on windows and change the operating state of the ventilation system to prevent the occurrence of condensation on windows in advance. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems and achieve the object, the ventilation system according to the present disclosure includes a ventilation fan for ventilating a room having a window, an environmental information acquisition unit for detecting environmental information which is information on the air environment around the window, and a determination unit for predicting the occurrence of condensation on the window at a first future time based on a predicted value of the window surface temperature at a first future time and a predicted value of the indoor air dew point temperature at the first future time calculated based on the environmental information detected by the environmental information acquisition unit. When the determination unit predicts the occurrence of condensation on the window at the first time, it controls a first condensation suppression operation mode that increases the exhaust air volume of the ventilation fan at a second time before the first time. Effect of the Invention

[0009] According to the present disclosure, it is possible to predict condensation on windows and change the operating state of a ventilation system, thereby advantageously preventing the occurrence of condensation on windows in advance. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing a configuration of a ventilation system according to a first embodiment. [Diagram 2] FIG. 1 is a block diagram showing a functional configuration of a ventilation fan provided in a ventilation system according to a first embodiment. [Diagram 3] FIG. 1 is a diagram showing an example of information used by a determination unit of the ventilation system according to the first embodiment to predict the occurrence of condensation on a window for each hour of the day; [Figure 4]FIG. 1 is a diagram showing an example of information on indoor temperatures at each time point during a predetermined period in the past, which is stored in a data storage unit of the ventilation system according to the first embodiment; [Diagram 5] FIG. 13 is a diagram showing an example of environmental information when a predicted value of the environmental information is corrected with a current value of the environmental information in the ventilation system according to the first embodiment; [Figure 6] 1 is a flowchart showing a procedure of an operation for preventing condensation on a window in the ventilation system according to the first embodiment. [Figure 7] FIG. 1 shows a configuration of a ventilation system according to a second embodiment. [Figure 8] FIG. 13 is a diagram showing a configuration of a ventilation system according to a third embodiment. [Figure 9] FIG. 11 is a block diagram showing a functional configuration of an indoor unit of an air conditioner provided in a ventilation system according to a third embodiment. [Figure 10] FIG. 11 is a block diagram showing a functional configuration of a remote controller provided in the ventilation system according to the third embodiment. [Figure 11] FIG. 13 is a diagram showing an example of a remote controller of an air conditioner provided in the ventilation system according to the third embodiment. [Figure 12] 11 is a flowchart showing a procedure of an operation in which a ventilation fan transitions to a condensation suppression operation mode when an air conditioner transitions to the condensation suppression operation mode by a user operation in a ventilation system according to a third embodiment. [Figure 13] FIG. 13 is a diagram showing a configuration of a ventilation system according to a fourth embodiment. [Figure 14] 11 is a flowchart showing a procedure for operating the air conditioner in the condensation suppression operation mode in the ventilation system according to the fourth embodiment when there is a person in the room. [Figure 15] FIG. 13 is a diagram showing a configuration of a ventilation system according to a fifth embodiment. [Figure 16] FIG. 13 is a diagram showing a configuration of a ventilation system according to a sixth embodiment. [Figure 17] FIG. 13 is a block diagram showing a functional configuration of a terminal device provided in the ventilation system according to the sixth embodiment. [Figure 18]FIG. 13 is a schematic diagram of an indoor image displayed on a terminal display unit of a terminal device provided in a ventilation system according to a sixth embodiment. [Figure 19] FIG. 13 is a first diagram showing an example of a display screen of a terminal display unit of a terminal device provided in a ventilation system according to a sixth embodiment; [Figure 20] FIG. 2 is a second diagram showing an example of a display screen of a terminal display unit of a terminal device provided in a ventilation system according to a sixth embodiment; [Figure 21] 13 is a flowchart showing a procedure for switching an air conditioner to a condensation suppression operation mode following a switch of a ventilation fan to a condensation suppression operation mode by an operation of a terminal device in a ventilation system according to a sixth embodiment. [Figure 22] 13 is a flowchart showing the procedure of an operation for canceling the condensation suppression operation mode of an air conditioner that has been switched to the condensation suppression operation mode following a ventilation fan that has been switched to the condensation suppression operation mode by an operation of a terminal device in a ventilation system according to a sixth embodiment. [Figure 23] 13 is a flowchart showing the procedure of an operation for canceling the condensation suppression operation mode of a ventilation fan that has been switched to the condensation suppression operation mode following an air conditioner that has been switched to the condensation suppression operation mode by operation of a remote controller in a ventilation system according to a sixth embodiment. [Figure 24] FIG. 13 is a diagram showing the configuration of a ventilation system according to a seventh embodiment. [Diagram 25] FIG. 23 is a diagram showing an example of a predicted value of a window surface temperature in a case where the predicted value of the window surface temperature is corrected by a current value of the predicted value of the window surface temperature in the ventilation system according to the seventh embodiment. [Figure 26] FIG. 13 is a diagram showing the configuration of a ventilation system according to an eighth embodiment. [Figure 27] A flow chart for finding an appropriate wind direction of heating air in a dew condensation suppression operation mode of an air conditioner in a ventilation system according to an eighth embodiment. [Figure 28] FIG. 13 is a diagram showing a configuration of a ventilation system according to a ninth embodiment. [Figure 29] FIG. 13 is a schematic diagram showing a state in which a window is not shown in an indoor image displayed on a terminal device included in a ventilation system according to a ninth embodiment. [Diagram 30]FIG. 13 is a diagram showing the configuration of a ventilation system according to a tenth embodiment. [Diagram 31] FIG. 13 is a schematic diagram showing the configuration of a heat exchange type ventilation fan provided in a ventilation system according to a tenth embodiment. [Diagram 32] FIG. 23 is a characteristic diagram showing an example of the relationship between the supply air volume and the exchange efficiency in a heat exchange type ventilation fan provided in the ventilation system according to the tenth embodiment. [Diagram 33] FIG. 32 is a table showing the temperature exchange efficiency and humidity exchange efficiency values ​​when the supply air volume is 100 m3 / h and when the supply air volume is 200 m3 / h. [Diagram 34] FIG. 14 is a diagram showing the configuration of a ventilation system according to an eleventh embodiment. [Diagram 35] FIG. 13 is a conceptual diagram showing an image of the flow of the exhaust air flow during the heat exchange ventilation operation of the heat exchange type ventilator provided in the ventilation system according to the eleventh embodiment. [Diagram 36] FIG. 23 is a conceptual diagram showing an image of the flow of the exhaust air flow during non-heat exchange ventilation operation of the heat exchange type ventilation fan provided in the ventilation system according to the eleventh embodiment. [Figure 37] FIG. 23 is an example of a characteristic diagram showing the relationship between the elapsed time and the indoor absolute humidity when a non-heat exchange ventilation operation and a heat exchange ventilation operation are combined in a condensation suppression operation mode in the ventilation system according to the eleventh embodiment. [Figure 38] FIG. 12 is a diagram showing the configuration of a ventilation system according to a twelfth embodiment. [Figure 39] FIG. 15 is a diagram showing a configuration in which the functions of the control unit according to the first to twelfth embodiments are realized by hardware. [Diagram 40] FIG. 15 is a diagram showing a configuration in which the functions of the control unit according to the first to twelfth embodiments are realized by software. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A ventilation system and a method for predicting condensation according to an embodiment will be described in detail below with reference to the drawings.

[0012] Embodiment 1 Fig. 1 is a diagram showing a configuration of a ventilation system according to embodiment 1. Fig. 2 is a block diagram showing a functional configuration of a ventilation fan provided in the ventilation system according to embodiment 1. The ventilation system 100a according to embodiment 1 is a ventilation system that ventilates the interior of a building, which is a ventilation target space, and is a ventilation system that can prevent condensation on windows of the building.

[0013] The ventilation system 100a includes a system main body 1, an indoor temperature acquisition unit 6, an indoor humidity acquisition unit 7, an outdoor temperature acquisition unit 8, and a ventilation fan 20. The above components constituting the ventilation system 100a are electrically connected and can transmit and receive information to and from each other. Each component of the ventilation system 100a will be described in detail below.

[0014] The system main body 1 is installed inside a building and controls the ventilation operation of the ventilation system 100a. The system main body 1 includes a judgment unit 2, a data storage unit 3, a system communication unit 4, and a system control unit 5. The above-mentioned components constituting the system main body 1 are electrically connected and can transmit and receive information to and from each other. In the first embodiment, the judgment unit 2 and the data storage unit 3 are arranged in the system main body 1, but one of the judgment unit 2 and the data storage unit 3 may be arranged outside the system main body 1.

[0015] The determination unit 2 controls, by remote management, the operation of devices such as the ventilation fan 20 included in the ventilation system 100a, such as starting, stopping, or adjusting the air volume. That is, the determination unit 2 can give an instruction to the ventilation fan 20 to increase or decrease the exhaust air volume of the ventilation fan 20.

[0016] The data storage unit 3 stores and holds various pieces of information used to control the ventilation system 100a for a predetermined retention period. The data storage unit 3 can acquire various pieces of information from outside the system main body unit 1 via the system communication unit 4. The data storage unit 3 stores and holds various pieces of information used to control the operation of devices such as the ventilation fan 20 included in the ventilation system 100a, such as indoor temperature data acquired by the indoor temperature acquisition unit 6, indoor humidity data acquired by the indoor humidity acquisition unit 7, and outdoor temperature acquired by the outdoor temperature acquisition unit 8, for a predetermined retention period.

[0017] The data storage unit 3 also stores operation state information indicating the operation state of the ventilation fan 20, which is transmitted from the ventilation fan 20. The operation state of the ventilation fan 20 is information such as stopped, operating at a low notch with a relatively low air volume, operating at a high notch with a relatively high air volume, etc.

[0018] The data holding unit 3 has a semiconductor storage medium such as a flash memory, which is a non-volatile storage unit, as a storage medium. The data holding unit 3 has a storage function for storing and holding various information. The data holding unit 3 also has a storage control function for performing processes such as acquiring various information from devices or components external to the data holding unit 3, storing and deleting various information in the storage unit, and transmitting various information stored in the storage unit to devices or components external to the data holding unit 3. The function of the data holding unit 3 as a storage unit and the storage control function may be independent components.

[0019] The system communication unit 4 communicates with devices external to the system main body 1. The system communication unit 4 communicates with the indoor temperature acquisition unit 6, the indoor humidity acquisition unit 7, the outdoor temperature acquisition unit 8, and the ventilation fan 20. The system communication unit 4 transmits information received from the communication unit of the device external to the system main body 1 to the system control unit 5 or the data holding unit 3. The system communication unit 4 transmits information received from the system control unit 5 or the data holding unit 3 to the communication unit of the device external to the indoor unit 30a.

[0020] The system control unit 5 controls the entire system main body 1 .

[0021] The indoor temperature acquisition unit 6 measures the temperature of the indoor air to detect the indoor temperature. The indoor temperature acquisition unit 6 is capable of transmitting information to the system main body unit 1. The indoor temperature acquisition unit 6 transmits the acquired indoor temperature information to the data storage unit 3. Note that the indoor temperature acquisition unit 6 may be directly and electrically connected to the data storage unit 3 and transmit the indoor temperature information directly to the data storage unit 3. The indoor temperature acquisition unit 6 is an environmental information acquisition unit that detects environmental information, which is information regarding the air environment around the window.

[0022] The indoor humidity acquisition unit 7 measures the humidity of the indoor air to detect the indoor humidity. The indoor humidity acquisition unit 7 is capable of transmitting information to the system main body unit 1. The indoor humidity acquisition unit 7 transmits the acquired indoor humidity information to the data storage unit 3. Note that the indoor humidity acquisition unit 7 may be directly and electrically connected to the data storage unit 3 and transmit the indoor humidity information directly to the data storage unit 3. The indoor humidity acquisition unit 7 may acquire the indoor absolute humidity, or may acquire the indoor relative humidity. The indoor humidity acquisition unit 7 is an environmental information acquisition unit that detects environmental information, which is information regarding the air environment around the window.

[0023] The outdoor temperature acquisition unit 8 measures the temperature of the outside air and detects the outdoor temperature, which is the temperature of the outside air. The outdoor temperature acquisition unit 8 is capable of transmitting information to the system main body unit 1. The outdoor temperature acquisition unit 8 transmits the acquired outdoor temperature information to the data storage unit 3. Note that the outdoor temperature acquisition unit 8 may be directly and electrically connected to the data storage unit 3 and may transmit the outdoor temperature information directly to the data storage unit 3. The outdoor temperature acquisition unit 8 is an environmental information acquisition unit that detects environmental information, which is information about the air environment around the window.

[0024] The ventilation fan 20 is a ventilation fan that is attached to the indoor side of a wall or ceiling of a building. The ventilation fan 20 has an exhaust air duct (not shown) and exhausts air from the room through the exhaust air duct to ventilate the room. The ventilation fan 20 and the system main body 1 are capable of communicating with each other. In other words, the ventilation fan 20 and the system main body 1 are capable of transmitting and receiving information to each other.

[0025] The ventilation fan 20 includes an exhaust blower 21, a ventilation fan memory unit 22, a ventilation fan communication unit 23, and a ventilation fan control unit 24.

[0026] The exhaust fan 21 is composed of an electric motor (not shown) and an impeller connected to the drive shaft of the electric motor. The impeller rotates when driven by the electric motor, thereby forming an airflow that exhausts indoor air. The electric motor drives the impeller. The air volume of the exhaust fan 21, i.e., the air volume of the ventilation fan 20, is controlled by controlling the rotation speed of the electric motor.

[0027] The ventilation fan memory unit 22 stores various information used for operating the ventilation fan 20.

[0028] The ventilation fan communication unit 23 communicates with devices external to the ventilation fan 20. The ventilation fan communication unit 23 communicates with the system communication unit 4 of the system main body 1. The ventilation fan communication unit 23 transmits information received from a communication unit of a device external to the ventilation fan 20 to the ventilation fan control unit 24. The ventilation fan communication unit 23 transmits information received from the ventilation fan control unit 24 to the communication unit of the device external to the ventilation fan 20. The communication method between the ventilation fan communication unit 23 and the system communication unit 4 may be wired communication or wireless communication.

[0029] The ventilation fan control unit 24 controls the operation of the ventilation fan 20. That is, the ventilation fan control unit 24 controls the operation of the exhaust blower 21 by controlling the driving of the electric motor. The ventilation fan control unit 24 also switches the operation mode of the ventilation operation of the ventilation fan 20 and the air volume of the ventilation operation in accordance with an instruction from the determination unit 2. The ventilation fan control unit 24 adjusts the output of the electric motor to control the rotation speed of the electric motor, thereby controlling the air volume of the exhaust blower 21, i.e., the air volume of the ventilation fan 20.

[0030] Next, an overview of the operation of the ventilation system 100a for preventing condensation on windows of a building will be described. Fig. 3 is a diagram showing an example of information used by the determination unit of the ventilation system according to the first embodiment to predict the occurrence of condensation on a window for each time. The various information shown in Fig. 3 is stored in the data storage unit 3. As shown in Fig. 3, the data storage unit 3 stores, in table format, information on the predicted value of the window surface temperature [°C], the predicted value of the indoor air dew point temperature [°C], and the result of the prediction of condensation on the window for each predetermined time.

[0031] The determination unit 2 compares, for each time, the predicted value of the window surface temperature and the predicted value of the indoor air dew point temperature stored in the data storage unit 3. The method of calculating the predicted value of the window surface temperature and the predicted value of the indoor air dew point temperature will be described later.

[0032] If the predicted value of the window surface temperature at a specific future time is smaller than the predicted value of the indoor air dew point temperature, i.e., if the relationship "predicted value of the window surface temperature < predicted value of the indoor air dew point temperature" is established, the judgment unit 2 judges that condensation will occur on the window at that time.

[0033] If the predicted value of the window surface temperature at a specific future time is equal to or higher than the predicted value of the indoor air dew point temperature, i.e., if the relationship "predicted value of the window surface temperature ≧ predicted value of the indoor air dew point temperature" holds, the judgment unit 2 judges that condensation will not occur on the window at that time.

[0034] When the determination unit 2 determines that condensation will occur on the window at a specific time in the future, the determination unit 2 controls the ventilation fan 20 to increase the exhaust air volume at a pre-control time that is a predetermined advance time before the specific time. That is, when the determination unit 2 determines that condensation will occur on the window at a specific time in the future, the determination unit 2 transmits to the ventilation fan 20 air volume increase instruction information instructing the ventilation fan 20 to increase the exhaust air volume at a pre-control time that is a predetermined advance time before the specific time. When the ventilation fan 20 receives the air volume increase instruction information, the ventilation fan 20 increases the exhaust air volume based on the air volume increase instruction information. Here, increasing the exhaust air volume includes starting the operation of the ventilation fan 20 when the ventilation fan 20 is stopped. If the specific time in the future is a first time in the future, the pre-control time can be said to be a second time that is a time after the present and a time before the first time.

[0035] Here, when increasing the exhaust air volume, for example, if the exhaust fan 20 is a model having two notches such as switching between strong and weak notches, the fan is increased by one notch. Also, for example, if the difference between the predicted window surface temperature and the predicted dew point temperature of the indoor air is equal to or greater than a predetermined value, the fan is operated at the strongest notch rather than increased by one notch. Also, when the exhaust fan 20 is stopped and is to be started, the fan is increased by one notch, for example.

[0036] As a result, the ventilation system 100a dehumidifies the room before condensation occurs on the windows, and maintains a space in which condensation is less likely to occur on the windows, thereby making it possible to prevent condensation on the windows.

[0037] The forward shift time is a time during which it is possible to prevent condensation on a window at a specific future time when it is predicted that condensation will occur by increasing the exhaust air volume of the ventilation fan 20 in advance, and is, for example, one hour. Information about the forward shift time is determined in advance and stored in the determination unit 2. Here, the forward shift time is only required to be a time during which it is possible to prevent condensation on a window at a specific future time when it is predicted that condensation will occur by increasing the exhaust air volume of the ventilation fan 20 in advance, and is not limited to one hour and can be changed to any time. Note that information about the forward shift time may be stored in the data storage unit 3.

[0038] The operating state of the above-mentioned ventilation fan 20 after switching to increase the exhaust airflow rate to prevent condensation on the window is referred to as the condensation suppression operating mode of the ventilation fan 20. In other words, the condensation suppression operating mode of the ventilation fan 20 is an operating mode of the ventilation fan 20 in which the exhaust airflow rate is increased when condensation is predicted to occur on the window at a specific time in the future.

[0039] Next, a method for calculating a predicted value of the window surface temperature and a predicted value of the indoor air dew point temperature used by the determination unit 2 to predict the occurrence of condensation on a window at a specific time in the future will be described.

[0040] (How to calculate the predicted window surface temperature) The determination unit 2 determines the window surface temperature t gi Calculate.

[0041]

number

[0042] In the above formula (1), the heat transfer coefficient depends on the conditions such as the material of the window, but for example, if the window glass is a single piece of float glass with a thickness of 5 mm, it can be calculated assuming that it is 5.9. In the above formula (1), the indoor heat transfer coefficient can be calculated assuming that it is 8.6. Information on the heat transfer coefficient and the indoor heat transfer coefficient, for example, the above values, are stored in advance in the determination unit 2. Note that the information on the heat transfer coefficient and the indoor heat transfer coefficient can be input and changed by the user using an external device of the system main body 1 that can access the system main body 1. Also, the information on the heat transfer coefficient and the indoor heat transfer coefficient may be stored in the data storage unit 3. Also, the heat transfer coefficient and the indoor heat transfer coefficient may be automatically set in the data storage unit 3 by selecting window glass conditions such as the material and number of window glass using an external device, etc.

[0043] Therefore, the determination unit 2 determines the indoor temperature t i and the outdoor temperature t o By acquiring the above data, the surface temperature of the window on the indoor side can be calculated.

[0044] The determination unit 2 can then calculate the predicted value of the window surface temperature at a specific time in the future by taking the indoor temperature as the predicted value of the indoor temperature at a specific time in the future and the outdoor temperature as the predicted value of the outdoor temperature at a specific time in the future. The method of calculating the predicted value of the indoor temperature and the predicted value of the outdoor temperature will be described later.

[0045] (How to calculate the predicted value of indoor air dew point temperature) The determination unit 2 calculates the dew point temperature of the indoor air using the following formulas (2) to (7). The information of formulas (2) to (7) is stored in the determination unit 2 in advance.

[0046] (First calculation method: When the absolute indoor temperature T [℃] and the indoor relative humidity U [%RH] are known) The determination unit 2 calculates the dew point temperature of the indoor air using the following formulas (2) to (6).

[0047]

number

[0048]

number

[0049]

number

[0050] (When y≧0)

number

[0051] (When y<0)

number

[0052] (Second calculation method: When the indoor relative humidity U [%RH] is unknown and the indoor absolute humidity D [kg / kg (DA)] is known) The second calculation method differs from the first calculation method described above only in the method of calculating the water vapor pressure. That is, the determination unit 2 calculates the dew point temperature of the indoor air using the above formulas (2), (4), (5), and (6) and the following formula (7), which is a method of calculating the water vapor pressure. The atmospheric pressure may be calculated assuming that it is, for example, 1013 hPa.

[0053]

number

[0054] Therefore, the judgment unit 2 can calculate the dew point temperature of the indoor air by acquiring the absolute indoor temperature T acquired by the indoor temperature acquisition unit 6 and the indoor humidity acquired by the indoor humidity acquisition unit 7, which is the indoor relative humidity U [% RH] or the indoor absolute humidity D.

[0055] The determination unit 2 can calculate the predicted value of the indoor air dew point temperature at a specific time in the future by taking the indoor temperature as the predicted value of the indoor temperature at a specific time in the future and taking the indoor humidity as the predicted value of the indoor humidity at a specific time in the future. The method of calculating the predicted value of the indoor temperature and the predicted value of the indoor humidity will be described later.

[0056] Next, a method for calculating the predicted values ​​of the indoor temperature, the indoor humidity, and the outdoor temperature will be described. In the following, a method for calculating the predicted value of the indoor temperature will be described as a representative example.

[0057] 4 is a diagram showing an example of information on indoor temperature at each time of a predetermined past period stored in the data storage unit of the ventilation system according to the first embodiment. Here, the predetermined past period is the most recent one week. As shown in FIG. 4, the data storage unit 3 stores, for example, data on indoor temperature at 9:00 for the most recent one week.

[0058] The determination unit 2 calculates the average value of the indoor temperature at 9:00 for the most recent past week stored in the data storage unit 3. The determination unit 2 sets the calculated average value of the indoor temperature as the predicted value of the indoor temperature at 9:00.

[0059] As described above, the determination unit 2 sets the average indoor temperature for the most recent past week at 9:00 as the predicted indoor temperature at 9:00. In other words, the determination unit 2 sets the average indoor temperature for a specific time during a predetermined period in the past as the predicted indoor temperature at the specific time.

[0060] In addition, when indoor temperature data for the past year is stored in the data retention unit 3 instead of indoor temperature data for the past week, the judgment unit 2 may use the indoor temperature at the corresponding specific time on the same day one year ago, or the average indoor temperature at the specific time during the same week one year ago, as the predicted value of the indoor temperature at that specific time.

[0061] The determination unit 2 can also determine the predicted value of the indoor humidity and the predicted value of the outdoor temperature in the same manner as the predicted value of the indoor temperature described above.

[0062] The indoor temperature, indoor humidity, and outdoor temperature are collectively referred to as environmental information.

[0063] The environmental information is information about the environment around the window, which is used to calculate a predicted value of the window surface temperature and a predicted value of the indoor air dew point temperature, which are used by the determination unit 2 to predict the occurrence of condensation on the window at a specific time in the future. The environmental information may include items other than the indoor temperature, indoor humidity, and outdoor temperature.

[0064] The environmental information is stored in the data storage unit 3. The environmental information stored in the data storage unit 3 may be limited to a predetermined storage period. That is, environmental information stored in the data storage unit 3 that is older than the predetermined storage period may be deleted, and the environmental information stored in the data storage unit 3 may be overwritten with relatively new environmental information. This allows the predicted value of the environmental information to be updated to a relatively new value even if the season changes and the trend of the environmental information changes. That is, by limiting the environmental information stored in the data storage unit 3 to a predetermined fixed period, the predicted value of the environmental information can be automatically made to follow seasonal changes.

[0065] The predicted value of the outdoor temperature may be based on the predicted value of the outdoor temperature in the weather information. When the predicted value of the outdoor temperature in the weather information is used as the predicted value of the outdoor temperature, the predicted value of the outdoor temperature is based on the actual weather forecast at the present time. In this case, the predicted value of the outdoor temperature can also handle sudden temperature changes such as typhoons, and a more accurate predicted value can be obtained than the above-mentioned predicted value of the outdoor temperature that simply uses past data, improving the accuracy of the prediction of the predicted value of the outdoor temperature.

[0066] In addition, the predicted value of the environmental information may be corrected using the current value of the environmental information. That is, the determination unit 2 may calculate the predicted value of the environmental information by correcting it using the current value of the environmental information. Fig. 5 is a diagram showing an example of the environmental information when the predicted value of the environmental information is corrected by the current value of the environmental information in the ventilation system according to the first embodiment.

[0067] As shown in FIG. 5, for example, the average value of the indoor temperature at 7:00 for the past week is 22°C. The average value of the indoor temperature at 6:00 for the past week is 21°C. The indoor temperature at 6:00 acquired by the indoor temperature acquisition unit 6 is 23°C. The indoor temperature at 6:00 acquired by the indoor temperature acquisition unit 6 is the current value of the indoor temperature. In this case, the difference between the average value of the indoor temperature at 6:00 acquired by the indoor temperature acquisition unit 6 and the average value of the indoor temperature at 6:00 for the past week is +2°C. The determination unit 2 adds the difference from the average value +2°C to the average value of the indoor temperature at 7:00 one hour later, which is 22°C, to calculate 24°C as the predicted value of the indoor temperature at 7:00.

[0068] As shown in FIG. 5, for example, the average value of the indoor temperature at 8:00 for the past week is 20° C. The average value of the indoor temperature at 7:00 for the past week is 22° C. The indoor temperature at 7:00 acquired by the indoor temperature acquisition unit 6 is 25° C. The indoor temperature at 7:00 acquired by the indoor temperature acquisition unit 6 is the current value of the indoor temperature. In this case, the difference between the average value of the indoor temperature at 7:00 acquired by the indoor temperature acquisition unit 6 and the average value of the indoor temperature at 7:00 for the past week is +3° C. The determination unit 2 adds the difference from the average value +3° C. to the average value of the indoor temperature at 8:00 one hour later, which is 20° C., to calculate 23° C. as the predicted value of the indoor temperature at 8:00.

[0069] The predicted value of the indoor temperature corrected using the current value of the environmental information as described above is based on the actual indoor temperature at the present time. Therefore, by correcting the predicted value of the indoor temperature with the current value of the indoor temperature, a more accurate predicted value of the indoor temperature can be obtained than a predicted value of the indoor temperature that simply uses past indoor temperature data. In other words, by correcting the predicted value of the environmental information calculated based on past environmental information data with the current value of the environmental information, a more accurate predicted value of the environmental information can be obtained than a predicted value of the environmental information that simply uses past data, and the accuracy of the prediction of the predicted value of the environmental information is improved.

[0070] Next, the operation and effect of preventing condensation on a window in the ventilation system 100a will be described. Fig. 6 is a flowchart showing the procedure of the operation for preventing condensation on a window in the ventilation system according to the first embodiment.

[0071] In step S110, the data storage unit 3 stores the environmental information. Specifically, the data storage unit 3 acquires and stores environmental information such as indoor temperature data acquired by the indoor temperature acquisition unit 6, indoor humidity data acquired by the indoor humidity acquisition unit 7, and outdoor temperature data acquired by the outdoor temperature acquisition unit 8 at predetermined times.

[0072] In step S120, the determination unit 2 calculates a predicted value of environmental information at a specific time in the future for a predetermined future period. The determination unit 2 calculates a predicted value of indoor temperature, a predicted value of indoor humidity, and a predicted value of outdoor temperature, which are environmental information, as described above, using the environmental information for the predetermined storage period stored in the data storage unit 3.

[0073] In step S130, the determination unit 2 calculates a predicted value of the window surface temperature and a predicted value of the indoor air dew point temperature using the predicted value of the environmental information at a specific future time calculated in step S120.

[0074] In step S140, the determination unit 2 determines whether or not condensation will occur on the window at a specific time in the future.

[0075] When the predicted value of the window surface temperature at a specific future time is smaller than the predicted value of the indoor air dew point temperature, the determination unit 2 determines that condensation will occur on the window at that time. In other words, when the relationship "predicted value of the window surface temperature < predicted value of the indoor air dew point temperature" is established, the determination unit 2 predicts that condensation will occur on the window at that time.

[0076] Furthermore, when the predicted value of the window surface temperature at a specific future time is equal to or higher than the predicted value of the indoor air dew point temperature, the determination unit 2 determines that condensation will not occur on the window at that time. In other words, when the relationship "predicted value of the window surface temperature ≧ predicted value of the indoor air dew point temperature" is established, the determination unit 2 predicts that condensation will not occur on the window at that time.

[0077] In step S140, the determination unit 2 determines whether or not condensation will occur on the window for each of a plurality of predetermined future specific times, for example, in ascending order of time.

[0078] If it is determined that condensation will not occur on the window at the specific time in the future, the result in step S140 is No, and the process returns to step S140 and repeats the determination. If it is determined that condensation will occur on the window at the specific time in the future, the result in step S140 is Yes, and the process proceeds to step S150.

[0079] In step S150, determination unit 2 controls ventilation fan 20 in the condensation suppression operation mode of ventilation fan 20 at a pre-control time that is a predetermined advance time before the specific future time at which it is determined that condensation will occur on the window. That is, determination unit 2 transmits airflow increase instruction information to ventilation fan 20 instructing it to increase the exhaust airflow at a pre-control time that is a predetermined advance time before the specific future time at which it is determined that condensation will occur on the window, and controls ventilation fan 20 in the condensation suppression operation mode of ventilation fan 20.

[0080] In step S160, the determination unit 2 determines whether or not condensation will occur on the window at a specific time in the future. After the exhaust fan 20 starts operating in the condensation suppression operation mode of the exhaust fan 20, the determination unit 2 determines whether or not condensation will occur on the window at a specific time in the future in the same manner as in steps S120 to S140 described above. New environmental information is stored in the data retention unit 3 even after the exhaust fan 20 transitions to the condensation suppression operation mode of the exhaust fan 20.

[0081] If it is determined that condensation will occur on the window at the specific time in the future, the result in step S160 is Yes, and the process returns to step S160 and repeats the determination. If it is determined that condensation will not occur on the window at the specific time in the future, the result in step S160 is No, and the process proceeds to step S170.

[0082] In step S170, at a specific future time when it is determined that condensation will not occur on the window, the determination unit 2 cancels the condensation suppression operation mode of the ventilation fan 20. That is, at a specific future time when it is determined that condensation will not occur on the window, the determination unit 2 transmits cancellation instruction information to the ventilation fan 20 instructing it to cancel the condensation suppression operation mode of the ventilation fan 20. In accordance with the cancellation instruction information, the ventilation fan 20 switches the operation of the ventilation fan 20 back to its original operation state before it transitioned to the condensation suppression operation mode of the ventilation fan 20.

[0083] As described above, in the ventilation system 100a according to the first embodiment, when the determination unit 2 predicts the occurrence of condensation on a window at a specific time in the future, it controls the ventilation fan 20 to operate in the condensation suppression operation mode of the ventilation fan 20 at an advance control time that is a predetermined advance time before the specific time, and controls to increase the exhaust air volume of the ventilation fan 20. In this way, the ventilation system 100a dehumidifies the room before condensation occurs on the window, and maintains a space in which condensation is unlikely to occur on the window, thereby making it possible to prevent condensation on the window.

[0084] Furthermore, when the determination unit 2 predicts that condensation will not occur on the windows at a specific time in the future, it cancels the condensation suppression operation mode of the ventilator fan 20 at that time and performs control to restore the exhaust air volume of the ventilator fan 20. In this way, the ventilation system 100a can prevent an unnecessary increase in the exhaust air volume of the ventilator fan 20, and can prevent condensation on the windows while realizing energy savings.

[0085] Therefore, according to the ventilation system 100a of the first embodiment, it is possible to predict condensation on the windows and change the operating state of the ventilation system to prevent condensation from occurring on the windows in advance. The ventilation system 100a can automatically prevent condensation from occurring on the windows in advance without requiring human intervention.

[0086] Embodiment 2 7 is a diagram showing a configuration of a ventilation system according to a second embodiment. In the second embodiment, a modified example of the ventilation system 100a according to the first embodiment will be described. The ventilation system 100b according to the second embodiment differs from the ventilation system 100a according to the first embodiment in that a server 1a is provided instead of the system main body 1.

[0087] The ventilation fan 20 and the server 1a are capable of communicating with each other. The ventilation fan 20 and the server 1a are also connected to each other via a network such as the Internet 200, which is a global information and communication network, so that they can communicate with each other. That is, the ventilation fan 20 and the server 1a are connected to the network and can transmit and receive information to each other. A cloud server or an on-premise server can be used for the server 1a. Whether a cloud server or an on-premise server is used, the server 1a is connected to each other via a network such as the Internet 200 so that they can communicate with each other.

[0088] The server 1a includes a determination unit 2, a data storage unit 3, a server communication unit 4a, and a server control unit 5b. The above components constituting the server 1a are electrically connected to each other and can transmit and receive information to and from each other.

[0089] The server communication unit 4a communicates with devices external to the server 1a. The server communication unit 4a communicates with the ventilation fan 20.

[0090] The server control unit 5b controls the entire server 1a.

[0091] That is, in the ventilation system 100b, the determination unit 2 and the data storage unit 3 are provided not in the system main body 1 but in the server 1a functioning as the system main body 1. The ventilation system 100b configured as described above has the same configuration and function as the ventilation system 100a according to the first embodiment, except that the determination unit 2 and the data storage unit 3 are provided in the server 1a.

[0092] The ventilation system 100b according to the second embodiment described above has the same effects as the ventilation system 100a according to the first embodiment described above.

[0093] In addition, in the ventilation system 100b, the determination unit 2 and the data storage unit 3 are arranged in the server 1a accessible via a network such as the Internet 200, so there is no need to physically install the determination unit 2 and the data storage unit 3 near the ventilation fan 20. This reduces the amount of equipment installed in the building, improving the flexibility of installing the ventilation system 100b in the building. In addition, the ventilation system 100b can expand the function of remotely controlling the ventilation fan 20 by linking a terminal device such as a smartphone installed with control application software for remotely controlling the operation of the ventilation fan 20 to the server 1a.

[0094] Embodiment 3 Fig. 8 is a diagram showing the configuration of a ventilation system according to a third embodiment. In the third embodiment, a modified example of the ventilation system 100a according to the first embodiment will be described. The ventilation system 100c according to the third embodiment differs from the ventilation system 100a according to the first embodiment in that the ventilation system 100c according to the third embodiment further includes an air conditioner 30 and a remote controller 40 in addition to the configuration of the ventilation system 100a according to the first embodiment.

[0095] The air conditioner 30 and the remote controller 40 are capable of communicating with the system main body 1. In other words, the air conditioner 30, the remote controller 40, and the system main body 1 are capable of transmitting and receiving information to and from each other.

[0096] The air conditioner 30 is installed in a room in a building in which the ventilation fan 20 is installed. Note that the air conditioner 30 may also be installed in another room that communicates with the room in which the ventilation fan 20 is installed.

[0097] The air conditioner 30 comprises an indoor unit 30a installed indoors, an outdoor unit (not shown) installed outdoors, and a remote controller 40. The indoor unit 30a is capable of communicating with the outdoor unit via a communication line. The remote controller 40 is an operation device operated by a user to set control instructions for the air conditioner 30 in order for the user to remotely control the air conditioner 30, and transmits the control instructions operated by the user to the indoor unit 30a of the air conditioner 30. Hereinafter, the remote controller may be referred to as a remote control.

[0098] Fig. 9 is a block diagram showing the functional configuration of an indoor unit of an air conditioner provided in a ventilation system according to embodiment 3. As shown in Fig. 9, the indoor unit 30a includes an indoor unit sensor 31, an airflow direction adjustment unit 32, an indoor unit storage unit 33, an indoor unit communication unit 34, and an indoor unit control unit 35. The above-mentioned components of the indoor unit 30a can exchange information with each other.

[0099] The indoor unit sensor 31 is a detector that detects the state of the air conditioner 30 and the state of the environment in which the air conditioner 30 is used in order to control the air conditioner 30. Examples of the indoor unit sensor 31 include various sensors such as an indoor temperature sensor 311 that detects the indoor temperature, and an indoor humidity sensor 312 that detects the indoor humidity.

[0100] The airflow direction adjustment unit 32 adjusts the direction in which the conditioned air is sent out from the indoor unit 30a. The airflow direction adjustment unit 32 adjusts the direction in which the conditioned air is sent out from the indoor unit 30a in accordance with the control of the indoor unit control unit .

[0101] The indoor unit storage unit 33 is a storage unit that stores various control setting values ​​and control programs for controlling the air conditioner 30. The indoor unit storage unit 33 is a non-volatile storage unit, and is configured with a semiconductor storage medium such as a flash memory.

[0102] The indoor unit communication unit 34 communicates with devices external to the indoor unit 30a. The indoor unit communication unit 34 communicates with the system communication unit 4 of the system main body 1. The indoor unit communication unit 34 transmits information received from the communication unit of the device external to the indoor unit 30a to the indoor unit control unit 35. The indoor unit communication unit 34 transmits information received from the indoor unit control unit 35 to the communication unit of the device external to the indoor unit 30a.

[0103] The communication method between the communication unit of the external device and the indoor unit communication unit 34 may be wired communication, or wireless communication using infrared communication, Wi-Fi (registered trademark) (Wireless Fidelity), Bluetooth (registered trademark), etc.

[0104] The indoor unit control unit 35 is a control unit that controls the overall operation of the indoor unit 30a, and controls the operation of the indoor unit 30a and the outdoor unit to control the operation of the air conditioner 30. The indoor unit control unit 35 receives various information transmitted from the communication unit of the device external to the indoor unit 30a via the indoor unit communication unit 34. The indoor unit control unit 35 transmits various information related to the air conditioner 30 to the device external to the indoor unit 30a via the indoor unit communication unit 34. The indoor unit control unit 35 transmits information such as information on the current operation mode of the air conditioner 30 and information on the operation state of the air conditioner 30 to the system control unit 5 or data holding unit 3 of the system main body 1 via the indoor unit communication unit 34.

[0105] Furthermore, the indoor unit control unit 35 controls the airflow direction adjustment unit 32 to adjust the direction in which the conditioned air is sent out from the indoor unit 30a. When the indoor unit control unit 35 receives airflow direction change instruction information from the determination unit 2 instructing a change in the airflow direction of the heated air, which is the conditioned air, the indoor unit control unit 35 controls the airflow direction adjustment unit 32 in accordance with the airflow direction change instruction information to adjust the blowing direction of the heated air sent out from the indoor unit 30a so that the heated air, which is the conditioned air, is blown against the window to raise the surface temperature of the window.

[0106] Fig. 10 is a block diagram showing the functional configuration of a remote controller provided in the ventilation system according to the third embodiment. The remote controller 40 includes a remote controller operation unit 41, a remote controller display unit 42, a remote controller storage unit 43, a remote controller communication unit 44, and a remote controller control unit 45. The above components of the remote controller 40 can exchange information with each other.

[0107] The remote control operation unit 41 is an interface for remotely controlling the operation of the air conditioner 30, and accepts operations from the user related to the operation of the air conditioner 30. When the remote control operation unit 41 accepts an operation from the user, it transmits operation information, which is information corresponding to the user's operation, to the remote control control unit 45.

[0108] The remote control display unit 42 displays various types of information related to the air conditioner 30. The remote control display unit 42 receives information transmitted from the remote control control unit 45, and displays various types of information based on the received information.

[0109] The remote control memory unit 43 stores various information related to ventilation operation in the air conditioner 30, and temporarily or long-term stores information such as the settings to be displayed on the remote control display unit 42 and image data related to the settings.

[0110] The remote control communication unit 44 communicates with a device external to the remote control 40. The remote control communication unit 44 communicates with the indoor unit communication unit 34 of the indoor unit 30a. The remote control communication unit 44 transmits information received from the communication unit of the device external to the remote control 40 to the remote control control unit 45. The remote control communication unit 44 transmits information received from the remote control control unit 45 to the communication unit of the device external to the remote control 40.

[0111] Note that the communication between the external device of the remote control 40 and the remote control communication unit 44 may be wireless communication or wired communication. In the third embodiment, the external device of the remote control 40 and the remote control 40 are wirelessly connected, and the communication between the external device of the remote control 40 and the remote control communication unit 44 is wireless communication.

[0112] The remote control control unit 45 controls the overall operation of the remote control 40. The remote control control unit 45 controls the remote control 40 based on operation information transmitted from the remote control operation unit 41. The remote control control unit 45 controls the transmission of control instruction commands related to the control of the air conditioner 30 based on operations by the user to the data storage unit 3 of the system main body 1. The remote control control unit 45 controls the display of various information on the remote control display unit 42.

[0113] In the ventilation system 100c according to the third embodiment having the above-mentioned configuration, the ventilation fan 20 shifts to the condensation suppression operation mode of the ventilation fan 20, and at the same time, the air conditioner 30 changes the direction of the heating air so as to raise the surface temperature of the window. In this way, the heated air of the air conditioner 30 is directed at the window to raise the surface temperature of the window, thereby further reducing the possibility that the indoor air will reach the dew point temperature. Therefore, the ventilation system 100c according to the third embodiment has a further improved effect of preventing condensation on the window compared to the ventilation system 100a according to the first embodiment.

[0114] The operating state of the air conditioner 30 after the air conditioner 30 has been switched to raise the surface temperature of the window by blowing heated air onto the window in order to prevent condensation on the window is referred to as the condensation suppression operating mode of the air conditioner 30. Therefore, in the ventilation system 100c, the exhaust fan 20 transitions to the condensation suppression operating mode of the exhaust fan 20 at the same time that the air conditioner 30 transitions to the condensation suppression operating mode of the air conditioner 30.

[0115] If the condensation prevention operation mode of the exhaust fan 20 is considered to be a first condensation prevention operation mode in the ventilation system 100c, the condensation prevention operation mode of the air conditioner 30 can be said to be a second condensation prevention operation mode in the ventilation system 100c.

[0116] Furthermore, the air conditioner 30 can be switched to the condensation suppression operation mode at any timing by the user inputting operation switch instruction information instructing the air conditioner 30 to switch to the condensation suppression operation mode into the remote control 40. That is, in the ventilation system 100c, the air conditioner 30 can be switched to the condensation suppression operation mode not only when the determination unit 2 predicts the occurrence of condensation on a window and the exhaust fan 20 transitions to the condensation suppression operation mode of the exhaust fan 20, but also at any timing instructed by the user.

[0117] Fig. 11 is a diagram showing an example of a remote controller of an air conditioner provided in the ventilation system according to embodiment 3. As shown in Fig. 11, a remote control operation unit 41 of a remote control 40 is provided with a condensation suppression button 411. The condensation suppression button 411 is a button that a user inputs into the remote control 40 operation switching instruction information that instructs the air conditioner 30 to switch to the condensation suppression operation mode.

[0118] When the user presses the condensation suppression button 411, the air conditioner 30 transitions to the condensation suppression operation mode of the air conditioner 30. That is, when the user presses the condensation suppression button 411, operation switch instruction information instructing the air conditioner 30 to switch to the condensation suppression operation mode is transmitted from the remote control 40 to the indoor unit control unit 35 of the indoor unit 30a. The indoor unit control unit 35 switches the operation of the air conditioner 30 to the condensation suppression operation mode of the air conditioner 30 in accordance with the operation switch instruction information.

[0119] When the user presses the condensation suppression button 411 again, the air conditioner 30 cancels the condensation suppression operation mode of the air conditioner 30. When the user presses the condensation suppression button 411 again, cancellation instruction information instructing the air conditioner 30 to cancel the condensation suppression operation mode is transmitted from the remote control 40 to the indoor unit control unit 35 of the indoor unit 30a. The indoor unit control unit 35 cancels the condensation suppression operation mode of the air conditioner 30 in accordance with the cancellation instruction information, and switches the operation of the air conditioner 30 to the original operation mode before transitioning to the condensation suppression operation mode of the air conditioner 30. In other words, when the condensation suppression button 411 on the remote control 40 is pressed while the air conditioner 30 is operating in the condensation suppression operation mode, the air conditioner 30 cancels the condensation suppression operation mode of the air conditioner 30.

[0120] Furthermore, when the air conditioner 30 switches to the condensation suppression operation mode of the air conditioner 30 at the instruction of the user, the ventilation fan 20 may automatically switch to the condensation suppression operation mode of the ventilation fan 20 accordingly. Fig. 12 is a flowchart showing the procedure of the operation of the ventilation fan to switch to the condensation suppression operation mode when the air conditioner switches to the condensation suppression operation mode at the instruction of the user in the ventilation system according to the third embodiment. In the example shown in Fig. 12, the condensation suppression button 411 on the remote control 40 is pressed twice to release the condensation suppression operation mode of the air conditioner 30.

[0121] In step S210, the remote control operation unit 41 of the remote control 40 accepts operation of the condensation suppression button 411 from the user. The remote control operation unit 41 transmits operation switch instruction information, which instructs the air conditioner 30 to switch to the condensation suppression operation mode, to the indoor unit control unit 35 of the indoor unit 30a as operation information corresponding to the operation of the condensation suppression button 411.

[0122] In step S220, the air conditioner 30 transitions to the condensation suppression operation mode of the air conditioner 30. Specifically, the indoor unit control unit 35 switches the operation of the air conditioner 30 to the condensation suppression operation mode of the air conditioner 30 in accordance with the operation switching instruction information.

[0123] In step S230, the indoor unit control unit 35 transmits state switching information for the air conditioner 30 to the condensation suppression operation mode to the data storage unit 3 of the system main body 1. The state switching information for the air conditioner 30 to the condensation suppression operation mode is information indicating that the operating state of the air conditioner 30 has switched to the condensation suppression operation mode of the air conditioner 30.

[0124] In step S240, the data holding unit 3 transmits operating state information of the air conditioner 30 in the condensation suppression operation mode to the determination unit 2, based on the state switching information of the air conditioner 30 to the condensation suppression operation mode transmitted from the indoor unit control unit 35. The operating state information of the air conditioner 30 in the condensation suppression operation mode is information indicating that the operating state of the air conditioner 30 is in the condensation suppression operation mode of the air conditioner 30.

[0125] In step S250, the determination unit 2 transmits, to the ventilation fan control unit 24 of the ventilation fan 20, operation switch instruction information for instructing the ventilation fan 20 to switch to the condensation suppression operation mode.

[0126] In step S260, the ventilation fan 20 transitions to the condensation suppression operation mode of the ventilation fan 20. Specifically, the ventilation fan control unit 24 switches the operation of the ventilation fan 20 to the condensation suppression operation mode of the ventilation fan 20 in accordance with the operation switch instruction information transmitted from the determination unit 2.

[0127] In step S270, the remote control operation unit 41 of the remote control 40 again accepts operation of the condensation suppression button 411 from the user. The remote control operation unit 41 transmits release instruction information, which instructs the air conditioner 30 to release the condensation suppression operation mode, to the indoor unit control unit 35 of the indoor unit 30a as operation information corresponding to the second operation of the condensation suppression button 411.

[0128] In step S280, the condensation suppression operation mode of the air conditioner 30 is cancelled. Specifically, the indoor unit control unit 35 cancels the condensation suppression operation mode of the air conditioner 30 in accordance with the cancellation instruction information, and switches the operation of the air conditioner 30 to the original operating state before the air conditioner 30 transitioned to the condensation suppression operation mode.

[0129] In step S290, the condensation suppression operation mode of the ventilation fan 20 is cancelled. Specifically, the indoor unit control unit 35 transmits cancellation information for the condensation suppression operation mode of the air conditioner 30 to the data retention unit 3 of the system main body 1. The cancellation information for the condensation suppression operation mode of the air conditioner 30 is information indicating that the condensation suppression operation mode of the air conditioner 30 has been cancelled. Upon receiving the cancellation information for the condensation suppression operation mode of the air conditioner 30, the data retention unit 3 transmits the cancellation information for the condensation suppression operation mode of the air conditioner 30 to the determination unit 2.

[0130] When the determination unit 2 receives the cancellation information of the condensation suppression operation mode of the air conditioner 30, it transmits cancellation instruction information to the ventilation fan control unit 24 of the ventilation fan 20 to instruct the ventilation fan 20 to cancel the condensation suppression operation mode. In accordance with the cancellation instruction information transmitted from the determination unit 2, the ventilation fan control unit 24 switches the operation of the ventilation fan 20 to the original operating state before the ventilation fan 20 transitioned to the condensation suppression operation mode.

[0131] The ventilation system 100c according to the third embodiment described above has the same effects as the ventilation system 100a according to the first embodiment described above.

[0132] Moreover, in the ventilation system 100c, the air conditioner 30 transitions to its condensation suppression operation mode at the same time that the ventilation fan 20 transitions to its condensation suppression operation mode. That is, in the ventilation system 100c, the ventilation fan 20 transitions to its condensation suppression operation mode and starts dehumidifying the room, and at the same time, the heated air of the air conditioner 30 is directed at the window to raise the surface temperature of the window, thereby further reducing the possibility that the indoor air will reach the dew point temperature. As a result, the ventilation system 100c further improves the effect of preventing condensation on the window compared to the ventilation system 100a according to the first embodiment.

[0133] Embodiment 4 Fig. 13 is a diagram showing the configuration of a ventilation system according to the fourth embodiment. In the fourth embodiment, a modified example of the ventilation system 100c according to the third embodiment will be described. The ventilation system 100d according to the fourth embodiment is different from the ventilation system 100c according to the third embodiment in that the ventilation system 100d according to the fourth embodiment further includes an indoor image acquisition unit 9 in addition to the configuration of the ventilation system 100c according to the third embodiment.

[0134] The indoor image acquisition unit 9 is equipped with an imaging device, captures images of objects in a room that is the monitoring range, and acquires information about the objects in the room as indoor images. The indoor image acquisition unit 9 periodically captures images of objects in the room at a predetermined cycle and acquires indoor images. The indoor image acquisition unit 9 is electrically connected to the data storage unit 3 of the system main body unit 1 and can transmit information to the data storage unit 3. The indoor image acquisition unit 9 transmits the acquired indoor image data to the data storage unit 3. The data storage unit 3 transmits the indoor image data to the determination unit 2.

[0135] The determination unit 2 can identify the positions of windows in the room and the positions of people in the room based on the indoor image data acquired from the data storage unit 3. Then, the determination unit 2 can generate airflow direction change instruction information that instructs the air conditioner 30 to send heated air toward the positions of the windows in the room, based on the information on the positions of the windows in the room acquired from the image data. This allows the determination unit 2 to adjust the direction of the heated air from the air conditioner 30 so that the air conditioner 30 sends heated air toward the positions of the windows in the room when the air conditioner 30 switches to the condensation suppression operation mode of the air conditioner 30.

[0136] Furthermore, when there are people in the room, the ventilation system 100d can turn off the condensation suppression operation mode of the air conditioner 30 and direct heated air at the people in the room. This allows the air conditioner 30 to prioritize heating over the windows even when it is operating in the condensation suppression operation mode of the air conditioner 30, preventing the people from feeling cold.

[0137] FIG. 14 is a flowchart showing the procedure for operating the air conditioner in the condensation suppression operation mode in the air conditioner in the ventilation system according to the fourth embodiment when there is a person in the room.

[0138] In step S310, the air conditioner 30 operates in the condensation suppression operation mode of the air conditioner 30.

[0139] In step S320, the indoor image acquisition unit 9 acquires indoor images at a predetermined cycle, and transmits data of the indoor images to the data storage unit 3.

[0140] In step S330, the data holding unit 3 transmits the data of the indoor image to the determination unit 2.

[0141] In step S340, the determination unit 2 determines whether or not a person is present in the indoor image.

[0142] If it is determined that no person is present in the indoor image, the result in step S340 is No, and the process returns to step S340 to repeat the determination for a new indoor image transmitted from the data storage unit 3. If it is determined that a person is present in the indoor image, the result in step S340 is Yes, and the process proceeds to step S350.

[0143] In step S350, the air conditioner 30 cancels the condensation suppression operation mode of the air conditioner 30 and adjusts the direction of the heated air so that the heated air is directed at the people in the room. Specifically, the determination unit 2 transmits cancellation instruction information to the indoor unit control unit 35 of the indoor unit 30a, which instructs the air conditioner 30 to cancel the condensation suppression operation mode. In addition, based on information about the positions of the people in the room acquired from the indoor image, the determination unit 2 transmits air direction change instruction information to the indoor unit control unit 35, which instructs the indoor unit control unit 35 to send the heated air toward the positions of the people in the room, thereby controlling the direction of the heated air.

[0144] The indoor unit control unit 35 cancels the condensation suppression operation mode of the air conditioner 30 in accordance with the cancellation instruction information, and switches the operation of the air conditioner 30 to the original operating state before the air conditioner 30 switched to the condensation suppression operation mode. Also, the indoor unit control unit 35 controls the air direction adjustment unit 32 to send heating air towards the positions of people in the room in accordance with the air direction change instruction information.

[0145] In step S360, the determination unit 2 determines whether or not a person is present in the indoor image during a predetermined waiting time. The determination unit 2 monitors the indoor image data transmitted from the data storage unit 3 at a predetermined cycle, and determines whether or not a person is present in the indoor image during the predetermined waiting time.

[0146] If it is determined that a person is present in the indoor image during the predetermined waiting time, the result in step S360 is Yes, and the process returns to step S360. The determination unit 2 repeats the determination for new indoor images transmitted from the data storage unit 3, using the time point at which it was determined that a person is present in the indoor image during the waiting time as a reference point. If it is determined that a person is not present in the indoor image during the predetermined waiting time, the result in step S360 is No, and the process proceeds to step S370.

[0147] In step S370, the air conditioner 30 transitions to the condensation suppression operation mode of the air conditioner 30. Specifically, the determination unit 2 transmits operation switch instruction information instructing the air conditioner 30 to switch to the condensation suppression operation mode to the indoor unit control unit 35 of the indoor unit 30a of the air conditioner 30. The indoor unit control unit 35 switches the operation of the air conditioner 30 to the condensation suppression operation mode of the air conditioner 30 in accordance with the operation switch instruction information.

[0148] The ventilation system 100d according to the above-described fourth embodiment has the same effects as the ventilation system 100c according to the above-described third embodiment.

[0149] Furthermore, when there are people in the room, the ventilation system 100d can turn off the condensation suppression operation mode of the air conditioner 30 and direct heated air at the people in the room. This allows the ventilation system 100d to prioritize heating of people rather than windows even when the air conditioner 30 is operating in the condensation suppression operation mode of the air conditioner 30, and can prevent people from feeling cold due to the air conditioner 30 operating in the condensation suppression operation mode of the air conditioner 30.

[0150] Embodiment 5. Fig. 15 is a diagram showing a configuration of a ventilation system according to a fifth embodiment. In the fifth embodiment, a modified example of the ventilation system 100d according to the fourth embodiment will be described. The ventilation system 100e according to the fifth embodiment is different from the ventilation system 100d according to the fourth embodiment in that the ventilation system 100e according to the fifth embodiment includes an infrared sensor 10 instead of the indoor image acquisition unit 9.

[0151] The infrared sensor 10 measures the surface temperature inside a room, which is a monitoring range. The infrared sensor 10 periodically detects the infrared intensity inside the monitoring range at a predetermined cycle. The infrared sensor 10 performs a predetermined conversion process on the detection result of the infrared intensity, thereby converting the detected infrared intensity inside the monitoring range into temperature and generating temperature distribution information indicating the temperature distribution of the surface temperature inside the room. Then, the infrared sensor 10 generates thermal image information, which is information of a thermal image that expresses the temperature distribution of the surface temperature inside the room by color temperature, from the temperature distribution information. The thermal image information is information that indicates the temperature information inside the room as an image.

[0152] The infrared sensor 10 is electrically connected to the data storage unit 3 of the system main body 1 and is capable of transmitting information to the data storage unit 3. The infrared sensor 10 transmits the acquired thermal image information to the data storage unit 3. The data storage unit 3 transmits the acquired thermal image information to the determination unit 2.

[0153] The determination unit 2 compares the temperature in the thermal image shown by the thermal image information acquired from the data storage unit 3 with the predicted value of the window surface temperature, and determines that the location in the room where the difference between the two is within a predetermined range is the location of the window. In other words, the determination unit 2 can determine and identify the location of the window in the room based on the thermal image information and the predicted value of the window surface temperature.

[0154] The determination unit 2 can generate airflow direction change instruction information that instructs the air conditioner 30 to send heated air toward the position of the window in the room based on information on the position of the window in the room acquired from the thermal image information. This allows the determination unit 2 to adjust the direction of the heated air from the air conditioner 30 so that the air conditioner 30 sends heated air toward the position of the window in the room when the air conditioner 30 switches to the condensation suppression operation mode of the air conditioner 30.

[0155] The ventilation system 100e according to the above-described fifth embodiment has the same effects as the ventilation system 100d according to the above-described fourth embodiment.

[0156] Embodiment 6 Fig. 16 is a diagram showing the configuration of a ventilation system according to a sixth embodiment. In the sixth embodiment, a modified example of the ventilation system 100d according to the fourth embodiment will be described. The ventilation system 100f according to the sixth embodiment is different from the ventilation system 100d according to the fourth embodiment in that a terminal device 50 is further provided in addition to the configuration of the ventilation system 100d according to the fourth embodiment.

[0157] The terminal device 50 and the system main body 1 are capable of communicating with each other. The terminal device 50 and the system main body 1 are also connected to each other so as to be able to communicate with each other via a network such as the Internet 200, which is a global information and communication network. In other words, the terminal device 50 and the system main body 1 are connected to the network and are capable of transmitting and receiving information to and from each other.

[0158] Terminal device 50 allows a user to operate and set a control instruction command for ventilation fan 20 in order to control ventilation fan 20, and transmits the control instruction command operated by the user to data storage unit 3 of system main body 1. Data storage unit 3 transmits the control instruction command transmitted from terminal device 50 to determination unit 2 of system main body 1. Determination unit 2 transmits the control instruction command transmitted from data storage unit 3 to ventilation fan control unit 24 of ventilation fan 20. Ventilation fan control unit 24 controls exhaust blower 21 in accordance with the control instruction command transmitted from determination unit 2 to control the operation of ventilation fan 20.

[0159] Furthermore, the terminal device 50 allows the user to operate and set control instructions for the air conditioner 30 in order to control the air conditioner 30, and transmits the control instructions operated by the user to a data storage unit 3 of the system main body 1. The data storage unit 3 transmits the control instructions transmitted from the terminal device 50 to a determination unit 2 of the system main body 1. The determination unit 2 transmits the control instructions transmitted from the data storage unit 3 to an indoor unit control unit 35 of the indoor unit 30a of the air conditioner 30. The indoor unit control unit 35 controls the operation of the air conditioner 30 in accordance with the control instructions transmitted from the determination unit 2.

[0160] The terminal device 50 has installed therein a control application software for remotely controlling the operation of the ventilation fan 20 and a control application software for remotely controlling the operation of the air conditioner 30. By using the control application software, the terminal device 50 can receive control operations for remotely controlling the operation of the ventilation fan 20 or the air conditioner 30 from a user and transmit the received control operations to the system main body 1. In other words, the terminal device 50 functions as a remote operation terminal for the ventilation system 100f.

[0161] The terminal device 50 displays various information acquired from the system main body 1 to present the various information to the user, and also receives various instruction information related to the operation of the ventilation fan 20 or the air conditioner 30 from the user. A mobile terminal such as a smartphone can be used as the terminal device 50. The functions of the terminal device 50 can be realized by, for example, a smartphone application or a communication device connectable to the World Wide Web.

[0162] Fig. 17 is a block diagram showing the functional configuration of a terminal device included in the ventilation system according to the sixth embodiment. The terminal device 50 includes a terminal operation unit 51, a terminal display unit 52, a terminal storage unit 53, a terminal communication unit 54, and a terminal control unit 55. The components of the terminal device 50 can exchange information with each other.

[0163] The terminal operation unit 51 is an operation reception unit that receives user operations, i.e., operations from the user. When the terminal operation unit 51 receives an operation by the user, it transmits operation information, which is information corresponding to the user's operation, to the terminal control unit 55. When the terminal operation unit 51 receives an operation for remotely controlling the operation of the ventilation fan 20 or the air conditioner 30, it transmits operation information corresponding to the operation to the terminal control unit 55. The terminal operation unit 51 is composed of input devices such as a keyboard, a mouse, and a touch panel display equipped with a touch panel function, and operations on the terminal device 50 are performed by the user.

[0164] The terminal display unit 52 is a display unit that displays various types of information inside the terminal device 50. The terminal display unit 52 also displays various types of information acquired from devices external to the terminal device 50. In the sixth embodiment, the terminal display unit 52 is configured by a touch panel display together with the terminal operation unit 51. The touch panel display of the terminal display unit 52 allows general operations on a touch panel display, such as a touch operation in which a finger touches the screen and a tap operation in which a finger taps the screen.

[0165] The terminal storage unit 53 is a storage unit that stores various types of information within the terminal device 50.

[0166] The terminal communication unit 54 is connected to the Internet 200 and communicates with the system main body 1. The terminal communication unit 54 transmits various information transmitted from the system main body 1 to the terminal control unit 55. The terminal communication unit 54 transmits operation information transmitted from the terminal control unit 55 to the data storage unit 3 of the system main body 1.

[0167] The terminal control unit 55 controls the overall processing of the terminal device 50. The terminal control unit 55 also controls the transmission of operation information based on an operation from a user to the system main body 1. The terminal control unit 55 also controls the transmission of a control instruction command related to the control of the ventilation fan 20 based on an operation from a user or a control instruction command related to the control of the air conditioner 30 based on an operation from a user to the data storage unit 3 of the system main body 1. The terminal control unit 55 also functions as a display control unit that controls the display of information on the terminal display unit 52.

[0168] The terminal device 50 having the above-mentioned configuration can acquire data of an indoor image acquired by the indoor image acquisition unit 9 from the system main body 1, and display the indoor image. Then, the user can specify the position of a window in the indoor image displayed on the terminal display unit 52 of the terminal device 50.

[0169] Fig. 18 is a schematic diagram of an indoor image displayed on a terminal display unit of a terminal device included in the ventilation system according to the sixth embodiment. For example, as shown in Fig. 18, an indoor image 521 displayed on the terminal display unit 52 is virtually divided into nine regions, from region R1 to region R9, by dashed lines. Each of the regions R1 to R9 can be selected by a user by touching the screen of the terminal display unit 52. The indoor image 521 is acquired by the indoor image acquisition unit 9 and transmitted to the terminal device 50 via the data storage unit 3.

[0170] For example, as shown in FIG. 18, if a window in the indoor image 521 is shown in the position of area R3 marked "window" among areas R1 to R9 on the terminal display unit 52, the user can select an area of ​​area R3 to adjust the air direction so that the air conditioner 30 blows heated air toward the position of area R3.

[0171] That is, when the user selects region R3 on the touch panel, terminal operation unit 51 generates position information of a position corresponding to region R3 in indoor image 521 as window position information, and transmits the window position information to data storage unit 3. Data storage unit 3 transmits the window position information to determination unit 2.

[0172] The determination unit 2 can identify the position of the window in the room based on the window position information and the data of the indoor image acquired from the data storage unit 3. Then, the determination unit 2 generates airflow direction change instruction information that instructs the air conditioner 30 to send heated air toward the position of the window in the room based on the window position information. This allows the determination unit 2 to adjust the direction of the heated air from the air conditioner 30 so that the air conditioner 30 sends heated air toward the position of the window in the room when the air conditioner 30 switches to the condensation suppression operation mode of the air conditioner 30.

[0173] As described above, the ventilation system 100f according to the sixth embodiment can generate position information of a position corresponding to the region R3 in the indoor image 521 showing the interior of the room as window position information. Then, the determination unit 2 generates airflow direction change instruction information that instructs the airflow to be sent toward the position of the window in the room, based on the window position information. As a result, the ventilation system 100f according to the sixth embodiment can send the heated air from the air conditioner 30 toward the window more accurately than the ventilation system 100d according to the fourth embodiment.

[0174] Furthermore, the ventilation system 100f can switch the ventilation fan 20 to the condensation suppression operation mode at any timing by the user inputting switching instruction information instructing the user to switch the ventilation fan 20 to the condensation suppression operation mode into the terminal device 50. That is, in the ventilation system 100f, the ventilation fan 20 can be switched to the condensation suppression operation mode not only when the determination unit 2 predicts the occurrence of condensation on the window, but also at any timing instructed by the user.

[0175] FIG. 19 is a first diagram showing an example of a display screen of the terminal display unit of the terminal device provided in the ventilation system according to the sixth embodiment. FIG. 20 is a second diagram showing an example of a display screen of the terminal display unit of the terminal device provided in the ventilation system according to the sixth embodiment. As shown in FIG. 19, an operation switching button 522 is displayed on the touch panel which is the terminal display unit 52 of the terminal device 50. The operation switching button 522 is a button with which the user inputs operation switching instruction information for instructing switching of the operation mode of the ventilation fan 20 into the terminal device 50. When the user presses the operation switching button 522, a selection screen 523 is displayed on which the user can select the operation state of the ventilation fan 20 to be instructed, as shown in FIG. 20.

[0176] 20, a strong ventilation button 524, a weak ventilation button 525, a condensation suppression button 526, and a stop button 527 are displayed. The strong ventilation button 524 is a button that the user uses to input into the terminal device 50 operation switching instruction information that instructs the ventilation fan 20 to switch to ventilation operation with the strong notch. The weak ventilation button 525 is a button that the user uses to input into the terminal device 50 operation switching instruction information that instructs the ventilation fan 20 to switch to ventilation operation with the weak notch. The condensation suppression button 526 is a button that the user uses to input into the terminal device 50 operation switching instruction information that instructs the ventilation fan 20 to switch to a condensation suppression operation mode. The stop button 527 is a button that the user uses to input into the terminal device 50 operation switching instruction information that instructs the ventilation fan 20 to stop.

[0177] When the user selects the condensation suppression button 526, the ventilation fan 20 can be switched to a condensation suppression operation mode of the ventilation fan 20. In addition, when the ventilation fan 20 is operating in the condensation suppression operation mode of the ventilation fan 20, the user can cancel the condensation suppression operation mode of the ventilation fan 20 by selecting a button other than the condensation suppression button 526 on the selection screen 523.

[0178] 20, when the user presses condensation suppression button 526, the ventilation fan 20 transitions to the condensation suppression operation mode of the ventilation fan 20. That is, when the user presses condensation suppression button 526, operation switch instruction information instructing switching to the condensation suppression operation mode of the ventilation fan 20 is transmitted from the terminal device 50 to the data storage unit 3 of the system main body 1. The data storage unit 3 transmits the operation switch instruction information to the determination unit 2. The determination unit 2 transmits the operation switch instruction information to the ventilation fan control unit 24 of the ventilation fan 20. The ventilation fan control unit 24 switches the operation of the ventilation fan 20 to the condensation suppression operation mode of the ventilation fan 20 in accordance with the operation switch instruction information.

[0179] As a result, the ventilation system 100f can switch the operation of the ventilation fan 20 to the condensation suppression operation mode of the ventilation fan 20 not only at the timing when the occurrence of condensation on the window is predicted by the judgment unit 2, but also at any timing instructed by the user.

[0180] In the ventilation system 100f, when the user switches the ventilation fan 20 to the condensation suppression operation mode of the ventilation fan 20 by operating the terminal device 50, the air conditioner 30 automatically switches accordingly to the condensation suppression operation mode of the air conditioner 30. Furthermore, in the ventilation system 100f, the user can select an operation mode other than the condensation suppression operation mode of the ventilation fan 20 from the terminal device 50 to cancel the condensation suppression operation mode of the ventilation fan 20.

[0181] When the user presses an operation button other than the condensation suppression button 526 on the selection screen 523 shown in Fig. 20, the ventilation fan 20 cancels the condensation suppression operation mode of the ventilation fan 20. That is, when the user presses an operation button other than the condensation suppression button 526, operation switch instruction information instructing a switch to an operation mode corresponding to the operation button is transmitted from the terminal device 50 to the data storage unit 3 of the system main body 1. The data storage unit 3 transmits the operation switch instruction information to the determination unit 2. The determination unit 2 transmits the operation switch instruction information to the ventilation fan control unit 24 of the ventilation fan 20. In accordance with the operation switch instruction information, the ventilation fan control unit 24 controls the operation of the ventilation fan 20 to the operation mode corresponding to the operation button operated by the user. Therefore, in this case, the condensation suppression operation mode of the ventilation fan 20 is canceled.

[0182] FIG. 21 is a flowchart showing an operational procedure in which, when the ventilation fan is switched to the condensation suppression operation mode by operation of a terminal device, the air conditioner subsequently switches to the condensation suppression operation mode in the ventilation system according to the sixth embodiment.

[0183] In step S410, the terminal operation unit 51 of the terminal device 50 accepts operation of the condensation suppression button 526 from the user on the selection screen 523 shown in FIG.

[0184] In step S420, the ventilation fan 20 transitions to a condensation suppression operation mode for the ventilation fan 20.

[0185] In step S430, the ventilation fan control unit 24 of the ventilation fan 20 transmits state switching information for switching the ventilation fan 20 to the condensation suppression operation mode to the data holding unit 3 of the system main body 1. The state switching information for switching the ventilation fan 20 to the condensation suppression operation mode is information indicating that the operation state of the ventilation fan 20 has switched to the condensation suppression operation mode of the ventilation fan 20.

[0186] In step S440, the data holding unit 3 transmits operation state information of the condensation suppression operation mode of the ventilation fan 20 to the determination unit 2, based on the state switching information of the ventilation fan 20 to the condensation suppression operation mode transmitted from the ventilation fan control unit 24. The operation state information of the condensation suppression operation mode of the ventilation fan 20 is information indicating that the operation state of the ventilation fan 20 is the condensation suppression operation mode of the ventilation fan 20.

[0187] In step S450, the determination unit 2 transmits operation switch instruction information to the indoor unit control unit 35 of the indoor unit 30a of the air conditioner 30, instructing the air conditioner 30 to switch to the condensation suppression operation mode.

[0188] In step S460, the air conditioner 30 transitions to a condensation suppression operation mode of the air conditioner 30. Specifically, the indoor unit control unit 35 switches the operation of the air conditioner 30 to the condensation suppression operation mode of the air conditioner 30 in accordance with the operation switching instruction information transmitted from the determination unit 2.

[0189] In step S470, the terminal operation unit 51 of the terminal device 50 accepts an operation of an operation button other than the condensation suppression button 526 from the user on the selection screen 523 shown in FIG.

[0190] In step S480, the ventilation fan 20 cancels the condensation suppression operation mode of the ventilation fan 20.

[0191] In step S490, the air conditioner 30 subsequently cancels the condensation prevention operation mode of the air conditioner 30, and switches the operation of the air conditioner 30 to the original operation mode before the air conditioner 30 switched to the condensation prevention operation mode.

[0192] Furthermore, in the ventilation system 100f, the dew condensation suppression operation mode of the air conditioner 30 can also be released from the remote control 40 of the air conditioner 30.

[0193] FIG. 22 is a flowchart showing the steps of the operation to cancel the condensation prevention operation mode of an air conditioner that has switched to the condensation prevention operation mode following a ventilation fan that has switched to the condensation prevention operation mode by operation of a terminal device in a ventilation system according to the sixth embodiment.

[0194] First, the above-mentioned steps S410 to S460 are carried out, and then the process proceeds to step S510.

[0195] In step S510, the remote control operation unit 41 of the remote control 40 accepts operation of the condensation suppression button 411 shown in FIG.

[0196] In step S520, the air conditioner 30 cancels the condensation prevention operation mode of the air conditioner 30, and switches the operation of the air conditioner 30 to the original operation mode before the air conditioner 30 transitioned to the condensation prevention operation mode.

[0197] In step S530, the ventilation fan 20 accordingly cancels the condensation suppression operation mode of the ventilation fan 20.

[0198] Furthermore, in the ventilation system 100f, as shown in the flowchart of FIG. 12, the user can switch the air conditioner 30 to the condensation prevention operation mode at any time by operating the remote control 40, and then cancel the condensation prevention operation mode of the ventilation fan 20 by selecting the operation mode of the ventilation fan 20 using an operation button other than the condensation prevention button 526 on the selection screen 523 of the terminal device 50 shown in FIG. 20.

[0199] FIG. 23 is a flowchart showing the steps of the operation to cancel the condensation prevention operation mode of a ventilation fan that has entered the condensation prevention operation mode following an air conditioner that has entered the condensation prevention operation mode by operation of a remote controller in a ventilation system according to the sixth embodiment.

[0200] First, the above-mentioned steps S210 to S260 are carried out, and then the process proceeds to step S610.

[0201] In step S610, the terminal operation unit 51 of the terminal device 50 accepts an operation of an operation button other than the condensation suppression button 526 from the user on the selection screen 523 shown in FIG.

[0202] In step S620, the ventilation fan 20 cancels the condensation suppression operation mode of the ventilation fan 20.

[0203] In step S630, the air conditioner 30 subsequently cancels the condensation prevention operation mode of the air conditioner 30, and switches the operation of the air conditioner 30 to the original operation mode before the air conditioner 30 switched to the condensation prevention operation mode.

[0204] The ventilation system 100f according to the sixth embodiment described above has the same effects as the ventilation system 100d according to the fourth embodiment described above.

[0205] Furthermore, in the ventilation system 100f, the operation of the ventilation fan 20 can be controlled using the terminal device 50, which improves the ease of use of the ventilation system 100f for the user.

[0206] Embodiment 7 Fig. 24 is a diagram showing the configuration of a ventilation system according to a seventh embodiment. In the seventh embodiment, a modified example of the ventilation system 100a according to the first embodiment will be described. The ventilation system 100g according to the seventh embodiment is different from the ventilation system 100a according to the first embodiment in that a thermometer 11 is further provided in addition to the configuration of the ventilation system 100a according to the first embodiment.

[0207] Thermometer 11 is installed so as to be in contact with the window on the indoor side, and detects the surface temperature of the window on the indoor side. Thermometer 11 is capable of transmitting information to system main body 1. Thermometer 11 transmits the acquired window surface temperature information to data holding unit 3. Data holding unit 3 transmits the window surface temperature information to judgment unit 2. Note that thermometer 11 may be directly and electrically connected to data holding unit 3, and may transmit window surface temperature information directly to data holding unit 3.

[0208] The determination unit 2 can improve the accuracy of prediction of the window surface temperature by correcting the predicted value of the window surface temperature calculated using the above-mentioned formula (1) with the current value of the window surface temperature detected by the thermometer 11. Correction of the predicted value of the window surface temperature with the current value of the window surface temperature detected by the thermometer 11 can be performed by the same method as the method shown in Fig. 5 above. That is, the predicted value of the window surface temperature is corrected using the difference between the predicted value of the window surface temperature calculated in the data storage unit 3 and the current value of the window surface temperature acquired by the thermometer 11.

[0209] FIG. 25 is a diagram showing an example of a predicted value of a window surface temperature in a case where the predicted value of the window surface temperature is corrected by a current value of the predicted value of the window surface temperature in the ventilation system according to the seventh embodiment.

[0210] As shown in FIG. 25, for example, the predicted value of the window surface temperature at 7:00 is 7.7°C. The predicted value of the window surface temperature at 6:00 is 6.7°C. The window surface temperature at 6:00 acquired by thermometer 11 is 6.0°C. The window surface temperature at 6:00 acquired by thermometer 11 is the current value of the window surface temperature. In this case, the difference between the predicted value of the window surface temperature at 6:00 and the window surface temperature at 6:00 acquired by thermometer 11 is −0.7°C. The determination unit 2 adds the difference of −0.7°C to 7.7°C, which is the predicted value of the window surface temperature at 7:00 one hour later, to calculate 7.0°C as the predicted value of the window surface temperature at 7:00.

[0211] The predicted value of the window surface temperature corrected using the current value of the window surface temperature as described above is based on the actual window surface temperature at the present time. Therefore, by correcting the predicted value of the window surface temperature with the current value of the window surface temperature, a more accurate predicted value of the window surface temperature can be obtained than a predicted value of the window surface temperature calculated simply using a predicted value of the indoor temperature and a predicted value of the outdoor temperature. In other words, by correcting the predicted value of the window surface temperature calculated using the above-mentioned formula (1) with the current value of the window surface temperature, a more accurate predicted value of the window surface temperature can be obtained, and the prediction accuracy of the predicted value of the window surface temperature is improved.

[0212] The ventilation system 100g according to the seventh embodiment described above has the same effects as the ventilation system 100a according to the first embodiment described above.

[0213] In addition, the ventilation system 100g can obtain a more accurate prediction value of the window surface temperature by correcting the prediction value of the window surface temperature calculated using the above-mentioned equation (1) with the current value of the window surface temperature, and the prediction accuracy of the predicted value of the window surface temperature is improved compared to the ventilation system 100a of embodiment 1.

[0214] Embodiment 8 Fig. 26 is a diagram showing the configuration of a ventilation system according to an eighth embodiment. In the eighth embodiment, a modified example of the ventilation system 100g according to the seventh embodiment will be described. The ventilation system 100h according to the eighth embodiment differs from the ventilation system 100g according to the seventh embodiment in that the ventilation system 100h according to the eighth embodiment further includes an air conditioner 30 and a remote control 40 in addition to the configuration of the ventilation system 100g according to the seventh embodiment.

[0215] The ventilation system 100h according to the eighth embodiment can find an appropriate wind direction of the heating air of the air conditioner 30 to raise the surface temperature of the window even when the air conditioner 30 cannot directly blow the heating air onto the window. As a result, the ventilation system 100h can effectively raise the surface temperature of the window by setting the wind direction of the heating air of the air conditioner 30 to an optimal wind direction in the condensation suppression operation mode of the air conditioner 30 even when the air conditioner 30 cannot directly blow the heating air onto the window.

[0216] 27 is a flowchart for finding an appropriate wind direction of the heating air in the condensation prevention operation mode of the air conditioner in the ventilation system according to embodiment 8. When the heating air cannot be blown directly onto the window, the air conditioner 30 performs heating operation in a plurality of predetermined wind directions to find an appropriate wind direction of the heating air of the air conditioner 30 for raising the surface temperature of the window.

[0217] In step S710, the air conditioner 30 starts operation in the condensation prevention operation mode of the air conditioner 30.

[0218] In step S720, the air conditioner 30, under the control of the determination unit 2, starts the heating operation for a predetermined air blowing time with an arbitrary wind direction that does not blow the heating wind directly against the window.

[0219] In step S730, the thermometer 11 detects the surface temperature of the window, and transmits information on the detected surface temperature of the window to the data holding unit 3. The data holding unit 3 transmits the information on the surface temperature of the window to the determination unit 2.

[0220] In step S740, the air conditioner 30, under the control of the determination unit 2, starts the heating operation for a predetermined air blowing time with another air direction that does not allow the heating air to be blown directly against the window.

[0221] In step S750, the thermometer 11 detects the surface temperature of the window, and transmits information on the detected surface temperature of the window to the data holding unit 3. The data holding unit 3 transmits the information on the surface temperature of the window to the determination unit 2.

[0222] In step S760, the determination unit 2 determines whether or not the heating operation has been performed in all of the predetermined airflow directions.

[0223] If it is determined that the heating operation has not been performed in all of the predetermined airflow directions, the result in step S760 is No, and the process returns to step S740. If it is determined that the heating operation has been performed in all of the predetermined airflow directions, the result in step S760 is Yes, and the process proceeds to step S770.

[0224] In step S770, the determination unit 2 determines the wind direction in which the window surface temperature was highest among the multiple wind directions as the appropriate wind direction that is the appropriate wind direction for the heating wind of the air conditioner 30 to increase the window surface temperature.

[0225] In step S780, the air conditioner 30 starts heating operation in an appropriate wind direction that does not blow the heating wind directly against the window under the control of the determination unit 2. That is, the determination unit 2 controls the wind direction of the heating wind to the wind direction in which the surface temperature of the window is the highest among multiple wind directions.

[0226] Thermometer 11 may be able to acquire position information of thermometer 11. Thermometer 11 transmits the acquired thermometer position information to data holding unit 3. Data holding unit 3 transmits the thermometer position information acquired from thermometer 11 to determination unit 2. Determination unit 2 controls air conditioner 30 to send heating air in the direction in which the thermometer position acquired from thermometer 11 is facing, assuming that this is the appropriate air direction. This makes it easier to find the optimal air direction for the heating air. Thermometer 11 is installed so as to be in contact with a window on the indoor side. Therefore, the position information of thermometer 11 can be treated as window position information.

[0227] The ventilation system 100h according to the above-described eighth embodiment has the same effects as the ventilation system 100g according to the above-described seventh embodiment.

[0228] Furthermore, even if the heated air from the air conditioner 30 cannot be directed directly at the window, the ventilation system 100h can effectively raise the surface temperature of the window by performing heating operation in an appropriate wind direction in the condensation prevention operation mode of the air conditioner 30, which is an appropriate wind direction for the heated air from the air conditioner 30 to raise the surface temperature of the window.

[0229] Embodiment 9 FIG. 28 is a diagram showing the configuration of a ventilation system according to the ninth embodiment. In the ninth embodiment, a modified example of the ventilation system 100h according to the eighth embodiment will be described. The ventilation system 100i according to the ninth embodiment is different from the ventilation system 100h according to the eighth embodiment in that the ventilation system 100i according to the ninth embodiment further includes an indoor image acquisition unit 9 and a terminal device 50 in addition to the configuration of the ventilation system 100h according to the eighth embodiment. That is, the ventilation system 100i according to the ninth embodiment has a configuration obtained by combining the ventilation system 100f according to the sixth embodiment and the ventilation system 100h according to the eighth embodiment.

[0230] The ventilation system 100i of the ninth embodiment is capable of quickly finding the optimal direction of the heating air from the air conditioner 30 in the condensation suppression operation mode of the air conditioner 30 in accordance with the flowchart of FIG. 27 when no windows are shown in the indoor image 521 shown in FIG. 18 displayed on the terminal device 50.

[0231] Fig. 29 is a schematic diagram showing a state in which a window is not shown in an indoor image displayed on a terminal device included in the ventilation system according to the ninth embodiment. In Fig. 18 described above, a window is shown in the indoor image 521 at the position of the region R3 displayed as "window". On the other hand, in the example of Fig. 29, a window is not shown in the indoor image 521. In Fig. 29, for example, when the indoor image 521 is virtually expanded, it is assumed that there is a window further to the right of the position of the region R6 of the indoor image 521, that is, around the position of the star in Fig. 29.

[0232] At this time, when area R6 is selected by the user on the touch panel, the air conditioner 30 first blows heated air toward a position in the room corresponding to area R6 in the indoor image 521 in Fig. 29. Area R6 is the area of ​​the indoor image 521 that is closest to the position marked with a star in Fig. 29, where it is assumed that a virtual window is present.

[0233] As described above, in the eighth embodiment, in order to find the optimum wind direction of the heated air of the air conditioner 30, the air conditioner 30 is controlled according to the flowchart in Fig. 27. On the other hand, in the ninth embodiment, in order to find the optimum wind direction of the heated air of the air conditioner 30, the air conditioner 30 is controlled according to the flowchart in Fig. 27, but because the user specifies the approximate position of the window in the room using the terminal device 50, the air conditioner 30 first blows the heated air towards the indoor position specified by the user.

[0234] Then, in the ventilation system 100i, for example, after blowing the heating air toward the indoor area corresponding to the area R6 in the indoor image 521 of FIG. 29, the wind direction of the heating air is changed to the indoor areas corresponding to the areas R3, R5, and R9 adjacent to the area R6 in the indoor image 521, and the surface temperatures of the windows are compared to find the optimal wind direction of the heating air of the air conditioner 30. That is, when the window is not shown in the indoor image, the determination unit 2 acquires information on the position of the area 6 in the indoor image 521, which is information on the position close to the window in the indoor image, from the terminal device 50. Also, the air conditioner performs heating operation with a plurality of different wind directions of the heating air toward the surrounding area of ​​the area corresponding to the position of the area 6, which is the position close to the window in the room. Then, the determination unit 2 controls the wind direction of the heating air to the wind direction in which the surface temperature of the window is the highest among the plurality of wind directions.

[0235] As a result, the ventilation system 100i can quickly find the optimal wind direction for the heating air of the air conditioner 30 without having to blow heating air in all wind directions that the air conditioner 30 can control. That is, when controlling the air conditioner 30 according to the flowchart in Fig. 27 to find the optimal wind direction for the heating air of the air conditioner 30, the ventilation system 100i can efficiently find the optimal wind direction for the heating air of the air conditioner 30 without having to blow heating air in all wind directions that the air conditioner 30 can control.

[0236] The ventilation system 100i according to the ninth embodiment described above has the same effects as the ventilation system 100f according to the sixth embodiment and the ventilation system 100h according to the eighth embodiment described above.

[0237] Furthermore, the ventilation system 100i can find the optimal wind direction for the heating air of the air conditioner 30 more quickly than the ventilation system 100h according to the eighth embodiment.

[0238] Embodiment 10 30 is a diagram showing a configuration of a ventilation system according to a tenth embodiment. In the tenth embodiment, a modified example of the ventilation system 100a according to the first embodiment will be described. The ventilation system 100j according to the tenth embodiment differs from the ventilation system 100a according to the first embodiment in that a heat exchange type ventilation fan 60 is provided instead of the ventilation fan 20.

[0239] Fig. 31 is a schematic diagram showing the configuration of a heat exchanger ventilation fan included in the ventilation system according to embodiment 10. Note that in Fig. 31, the heat exchanger ventilation fan 60 is shown in a simplified form.

[0240] As shown in Fig. 31, a heat exchange type ventilation fan 60 includes a main body 61. The main body 61 has a heat exchanger 66 inside a rectangular parallelepiped housing 61a made of sheet metal. The heat exchanger 66 exchanges heat or humidity between an intake air flow and an exhaust air flow. The heat exchanger 66 may be a sensible heat exchanger or a total heat exchanger.

[0241] In addition to the above-mentioned heat exchanger 66, the main body 61 includes an exhaust air outlet 61g and an outside air inlet 61d arranged side by side on one end face 61b in the longitudinal direction of the housing 61a, and an air supply outlet 61e and an indoor air inlet 61f arranged side by side on the other end face 61c opposite to the one end face 61b in the longitudinal direction of the housing 61a. The main body 61 includes an air supply duct 62 connecting the outside air inlet 61d and the air supply outlet 61e via the heat exchanger 66, and an exhaust duct 63 connecting the indoor air inlet 61f and the exhaust outlet 61g via the heat exchanger 66. The air supply duct 62 and the exhaust duct 63 intersect at the heat exchanger 66.

[0242] The main body 61 is provided with an intake air blower 64 in the intake air duct 62, which generates an intake air flow from the inlet end to the outlet end of the intake air duct 62, i.e., an intake air flow from the outside air inlet 61d to the intake air outlet 61e. The intake air blower 64 operates to generate an intake air flow, and outside air can be taken into the room via the heat exchange type ventilation fan 60. In other words, the intake air blower 64 is a blower that draws in outside air from outside the building and blows the outside air after heat exchange into the room for heat exchange intake. An intake motor (not shown) for driving the intake air blower 64 is provided inside.

[0243] The main body 61 also includes an exhaust fan 65 in the exhaust air duct 63, which generates an exhaust air flow from the inlet end to the outlet end of the exhaust air duct 63, i.e., an exhaust air flow from the indoor air intake port 61f to the exhaust air discharge port 61g. The exhaust fan 65 operates to generate an exhaust air flow, and the indoor air can be discharged to the outside via the heat exchange type ventilation fan 60. That is, the exhaust fan 65 is a fan that performs air blowing for heat exchange exhaust, sucking in air inside the building and sending the air inside the building after heat exchange to the outside of the building for discharge. The exhaust fan 65 includes an exhaust motor (not shown) for driving the exhaust fan 65.

[0244] The main body 61 is also provided with a heat exchanger fan control unit 67, which is a control unit that controls the overall operation of the heat exchanger fan 60. The heat exchanger fan control unit 67 controls the operation of components including the intake air blower 64 and the exhaust air blower 65, thereby controlling the operation of the heat exchanger fan 60.

[0245] In the tenth embodiment, the condensation suppression operation mode of the ventilation fan 20 in the ventilation system 100a according to the first embodiment becomes the condensation suppression operation mode of the heat exchanger ventilation fan 60 of the ventilation system 100j according to the tenth embodiment. That is, the condensation suppression operation mode of the heat exchanger ventilation fan 60 is an operation mode of the heat exchanger ventilation fan 60 in which the exhaust air volume is increased when the occurrence of condensation on a window is predicted at a specific time in the future.

[0246] The condensation suppression operation mode of the heat exchanger fan 60 is an operation mode in which the exhaust air volume is larger than the supply air volume in the heat exchanger fan 60, that is, exhaust air volume > supply air volume.

[0247] In the condensation suppression operation mode of the heat exchange type ventilation fan 60, the method of making the exhaust air volume larger than the supply air volume, i.e., making the exhaust air volume > supply air volume, may be any of the following: increasing only the exhaust air volume, decreasing only the supply air volume, or increasing the exhaust air volume and decreasing the supply air volume at the same time.

[0248] Then, when the judgment unit 2 predicts the occurrence of condensation on a window at a specific time in the future, it controls the heat exchanger type ventilation fan 60 to operate in the condensation suppression operation mode of the heat exchanger type ventilation fan 60 at a pre-control time that is a predetermined advance time before the specific time.

[0249] As a result, in the ventilation system 100j of embodiment 10, like the ventilation system 100a of embodiment 1, it is possible to prevent condensation on the windows by dehumidifying the room before condensation occurs and maintaining a space in which condensation is less likely to occur.

[0250] Furthermore, when the determination unit 2 predicts that condensation will not occur on the window at a specific time in the future, it performs control to return the exhaust air volume of the heat exchanger ventilation fan 60 to the original volume at that time. That is, when the determination unit 2 predicts that condensation will not occur on the window at a specific time in the future, it performs control to cancel the condensation suppression operation mode of the heat exchanger ventilation fan 60 at that time.

[0251] The ventilation system 100j according to the tenth embodiment is capable of preventing condensation on windows while suppressing a decrease in indoor temperature, as compared with the ventilation system 100a according to the first embodiment.

[0252] 32 is a characteristic diagram showing an example of the relationship between the supply air volume and the exchange efficiency in the heat exchanger fan included in the ventilation system according to the tenth embodiment. In FIG. 32, for example, when the exhaust air volume of the heat exchanger fan 60 is 150 m 3 33 shows the change in temperature exchange efficiency and humidity exchange efficiency when the supply air volume of the heat exchange type ventilation fan 60 is changed while keeping the supply air volume constant at 100 m3 / h. 3 / h and when the supply air volume is 200 m 3 This is a table showing the temperature exchange efficiency and humidity exchange efficiency at 200 / hr and 200 / hr.

[0253] As shown in the rightmost column of the table in Figure 33, the supply air volume is 200 m 3 / h, the supply air volume is 100m 3 / h, the increase rate is 1.5 times for the temperature exchange efficiency and 1.4 times for the humidity exchange efficiency. As described above, in the heat exchanger type ventilator 60, by making the exhaust rich, both the temperature exchange efficiency and the humidity exchange efficiency are improved, but the increase rate of the temperature exchange efficiency is greater. Therefore, the heat exchanger type ventilator 60 is capable of exhausting moisture from the room while maintaining the room temperature. This allows the ventilation system 100j to prevent condensation on the windows while suppressing a drop in the room temperature.

[0254] Exhaust rich is a state in which the exhaust air volume is greater than the supply air volume, i.e., exhaust air volume > supply air volume. Supply rich is a state in which the exhaust air volume is smaller than the supply air volume, i.e., exhaust air volume < supply air volume.

[0255] The ventilation system 100j according to the tenth embodiment described above has the same effects as the ventilation system 100a according to the first embodiment described above.

[0256] Furthermore, compared to the ventilation system 100a according to the first embodiment, the ventilation system 100j is capable of preventing condensation on windows while suppressing a drop in indoor temperature.

[0257] Embodiment 11 34 is a diagram showing a configuration of a ventilation system according to an eleventh embodiment. In the eleventh embodiment, a modified example of the ventilation system 100j according to the tenth embodiment will be described. The ventilation system 100k according to the eleventh embodiment is different from the ventilation system 100j according to the tenth embodiment in that a heat exchanger type ventilation fan 60a is provided instead of the heat exchanger type ventilation fan 60.

[0258] FIG. 35 is a conceptual diagram showing an image of the flow of the exhaust air flow during the heat exchange ventilation operation of the heat exchange type ventilation fan provided in the ventilation system according to the eleventh embodiment. FIG. 36 is a conceptual diagram showing an image of the flow of the exhaust air flow during the non-heat exchange ventilation operation of the heat exchange type ventilation fan provided in the ventilation system according to the eleventh embodiment. The arrows in FIG. 35 and FIG. 36 indicate the flow of the air flow. Note that in FIG. 35 and FIG. 36, the heat exchange type ventilation fan 60a is shown in a simplified form. In FIG. 35 and FIG. 36, the same components as those in FIG. 31 are denoted by the same reference numerals as in FIG. 31, and detailed description thereof will be omitted.

[0259] Inside the housing 61a, an exhaust side bypass air duct 68 is formed, which is a bypass air duct that bypasses the heat exchanger 66 and is disposed adjacent to the air duct that passes through the heat exchanger 66 in the exhaust air duct 63 that is a heat exchange exhaust air duct. The exhaust side bypass air duct 68 is an air duct that bypasses the heat exchanger 66 and connects the indoor air intake port 61f and the exhaust outlet port 61g, and is a bypass air duct for flowing the exhaust flow to the exhaust outlet port 61g without passing through the heat exchanger 66. The exhaust side bypass air duct 68 is a non-heat exchange air duct that does not pass through the heat exchanger 66.

[0260] The heat exchange type ventilation fan 60a can perform heat exchange ventilation involving heat exchange between the intake air flow and the exhaust air flow by passing the exhaust air flow, which is the airflow of indoor air sucked in from the indoor air intake port 61f, through the exhaust air duct 63, which is a heat exchange exhaust air duct, and passing it through the heat exchanger 66. On the other hand, the heat exchange type ventilation fan 60a can perform normal ventilation without heat exchange between the intake air flow and the exhaust air flow by passing the exhaust air flow, which is the airflow of indoor air sucked in from the indoor air intake port 61f, through the exhaust side bypass air duct 68 and not through the heat exchanger 66. Normal ventilation is non-heat exchange ventilation, which is ventilation without heat exchange between the intake air flow and the exhaust air flow.

[0261] Inside housing 61a, at a portion where exhaust air passage 63 and exhaust-side bypass air passage 68 branch off, there is provided an electrically-operated exhaust air passage switching damper 69 which is a damper for switching between the air passage passing through heat exchanger 66 in exhaust air passage 63 and exhaust-side bypass air passage 68. In other words, exhaust air passage switching damper 69 is a damper for switching between exhaust air passage 63 and exhaust-side bypass air passage 68.

[0262] The exhaust airflow duct switching damper 69 can reduce or eliminate the ratio of the air volume of the exhaust airflow passing through the heat exchanger 66. The exhaust airflow duct switching damper 69 has a rotating shaft at the branch point between the exhaust airflow duct 63 and the exhaust side bypass airflow duct 68, and constitutes an airflow duct switching unit that switches between the exhaust airflow duct 63 and the exhaust side bypass airflow duct 68 by switching whether or not the indoor air sucked from the indoor air intake port 61f passes through the heat exchanger 66. The exhaust airflow duct switching damper 69 is made of, for example, a rotating plate, and can switch between the exhaust airflow duct 63 and the exhaust side bypass airflow duct 68 by changing its orientation. The operation of the exhaust airflow duct switching damper 69 is controlled by the heat exchange type ventilation fan control unit 67.

[0263] 35 shows a state in which exhaust air passage switching damper 69 is disposed in a blocking position for blocking exhaust-side bypass air passage 68, and the exhaust air passage through which the exhaust flow passes is switched to exhaust air passage 63. When exhaust air passage switching damper 69 is disposed in the blocking position as shown in FIG. 35, exhaust air passage 63 is opened and exhaust-side bypass air passage 68 is blocked. As a result, the exhaust flow flows into heat exchanger 66, and heat exchange type ventilation fan 60a can perform heat exchange ventilation operation in which heat exchange is performed between the supply air flow and the exhaust air flow in heat exchanger 66.

[0264] 36 shows a state in which exhaust air duct switching damper 69 is disposed in an open position that opens exhaust-side bypass air duct 68, and the exhaust air duct through which the exhaust flow passes is switched to exhaust-side bypass air duct 68. When exhaust air duct switching damper 69 is disposed in the open position as shown in FIG. 36, exhaust air duct 63 is closed and exhaust-side bypass air duct 68 is opened. As a result, the exhaust flow does not pass through heat exchanger 66, and heat exchange type ventilation fan 60a can perform normal ventilation operation, which is a non-heat exchange ventilation operation in which heat exchanger 66 does not exchange heat between the intake air flow and the exhaust air flow.

[0265] Furthermore, by disposing the exhaust air passage switching damper 69 at a position between the closed position and the open position, the proportion of the exhaust air flow passing through the heat exchanger 66 can be reduced to perform heat exchange ventilation operation.

[0266] The normal ventilation operation can be said to be a bypass ventilation operation in which the exhaust air flows around the heat exchanger 66 and the indoor air is exhausted to the outside without passing through the heat exchanger 66.

[0267] In the eleventh embodiment, the condensation suppression operation mode of the ventilation fan 20 in the ventilation system 100a according to the first embodiment becomes the condensation suppression operation mode of the heat exchanger ventilation fan 60a of the ventilation system 100k according to the eleventh embodiment. That is, the condensation suppression operation mode of the heat exchanger ventilation fan 60a is an operation mode of the heat exchanger ventilation fan 60a in which the exhaust air volume is increased when the occurrence of condensation on a window is predicted at a specific time in the future.

[0268] The condensation suppression operation mode of the heat exchanger fan 60a is an operation mode in which the exhaust air volume is larger than the supply air volume in the heat exchanger fan 60a, that is, exhaust air volume > supply air volume.

[0269] In the condensation suppression operation mode of the heat exchange type ventilation fan 60a, the method of making the exhaust air volume larger than the supply air volume, i.e., making the exhaust air volume > supply air volume, may be any of the following: increasing only the exhaust air volume, decreasing only the supply air volume, or increasing the exhaust air volume and decreasing the supply air volume at the same time.

[0270] In the ventilation system 100k according to the eleventh embodiment, when the determination unit 2 predicts the occurrence of condensation on the window and the heat exchanger ventilator 60a transitions to the condensation suppression operation mode of the heat exchanger ventilator 60a, a bypass ventilation operation in which indoor air is exhausted to the outside without passing through the heat exchanger 66, i.e., a non-heat exchange ventilation operation, may be performed. By performing the bypass ventilation operation when the heat exchanger ventilator 60a transitions to the condensation suppression operation mode of the heat exchanger ventilator 60a, the heat exchanger ventilator 60a fulfills the same function as the ventilator 20 according to the first embodiment.

[0271] In addition, in the ventilation system 100k, when the determination unit 2 predicts the occurrence of condensation on the window and the heat exchanger ventilator 60a transitions to the condensation suppression operation mode of the heat exchanger ventilator 60a, the bypass ventilation operation can be performed and the exhaust rich state in which the exhaust air volume is larger than the supply air volume can be set. In this case, when the heat exchanger ventilator 60a transitions to the condensation suppression operation mode of the heat exchanger ventilator 60a, the indoor humidity is dehumidified without performing humidity exchange, so that the indoor humidity can be dehumidified more quickly than when the heat exchanger ventilator 60a transitions to the condensation suppression operation mode of the heat exchanger ventilator 60a and the exhaust rich state.

[0272] Furthermore, in the ventilation system 100k, in the condensation suppression operation mode of the heat exchange type ventilation fan 60a, a bypass ventilation operation, that is, a non-heat exchange ventilation operation, can be combined with a heat exchange ventilation operation.

[0273] Fig. 37 is a diagram showing an example of a characteristics diagram showing the relationship between the elapsed time and the indoor absolute humidity when the non-heat exchange ventilation operation and the heat exchange ventilation operation are combined in the condensation suppression operation mode in the ventilation system according to embodiment 11. Fig. 37 shows a case where, when the heat exchanger type ventilation fan 60a transitions to the condensation suppression operation mode, the bypass ventilation operation is first performed for a predetermined time, and then the heat exchange ventilation operation is performed in exhaust rich mode.

[0274] As can be seen from Fig. 37, the absolute humidity in the room can be quickly reduced by first performing bypass ventilation operation for a predetermined period of time with the heat exchanger type ventilation fan 60a. After that, by switching the operation of the heat exchanger type ventilation fan 60a to heat exchange ventilation operation and performing exhaust rich operation, moisture can be removed while suppressing a drop in the room temperature, and a space in which condensation is unlikely to form on the windows can be maintained.

[0275] The ventilation system 100k according to the eleventh embodiment described above has the same effects as the ventilation system 100j according to the tenth embodiment described above.

[0276] In addition, when the heat exchange type ventilation fan 60a transitions to the condensation suppression operation mode, the ventilation system 100k performs heat exchange ventilation operation in exhaust rich mode, thereby dehumidifying the room without performing humidity exchange, and therefore can dehumidify the room more quickly than the ventilation system 100j of embodiment 10.

[0277] Embodiment 12 FIG. 38 is a diagram showing the configuration of a ventilation system according to a twelfth embodiment. In the twelfth embodiment, a modified example of the ventilation system 100a according to the first embodiment will be described. The ventilation system 100l according to the twelfth embodiment is different from the ventilation system 100a according to the first embodiment in that the ventilation system 100l according to the twelfth embodiment further includes an air pressure acquisition unit 12 in addition to the configuration of the ventilation system 100a according to the first embodiment. The environmental information may include air pressure information.

[0278] The air pressure acquisition unit 12 detects the air pressure inside the room. The air pressure acquisition unit 12 is capable of transmitting information to the system main body unit 1. The air pressure acquisition unit 12 transmits the acquired information on the air pressure inside the room to the data storage unit 3. The air pressure acquisition unit 12 may be electrically connected directly to the data storage unit 3 and transmit the information on the air pressure inside the room directly to the data storage unit 3. The air pressure acquisition unit 12 is an environmental information acquisition unit that detects environmental information, which is information on the air environment around the window.

[0279] When the indoor humidity acquisition unit 7 acquires the absolute humidity of the indoor air, the judgment unit 2 can use the acquired value of the atmospheric pressure in the atmospheric pressure acquisition unit 12 to calculate the water vapor pressure by the above-mentioned formula (7) using the absolute humidity D. When the judgment unit 2 calculates the water vapor pressure by the above-mentioned formula (7), by using the acquired value of the atmospheric pressure in the atmospheric pressure acquisition unit 12, which is the current atmospheric pressure, rather than calculating under an assumption that the atmospheric pressure is 1013 hPa, the accuracy of the prediction of the predicted value of the indoor air dew point temperature is improved, and the accuracy of the prediction of the occurrence of condensation on the windows is also improved.

[0280] In addition, the predicted value of the indoor air pressure may be the predicted value of the air pressure in the weather information in accordance with the predicted value of the outdoor temperature. When the predicted value of the air pressure in the weather information is used for the predicted value of the air pressure, the predicted value of the water vapor pressure is based on the actual weather forecast at the present time. In this case, the predicted value of the indoor air dew point temperature can also handle sudden changes in air pressure such as typhoons, and a more accurate predicted value can be obtained, improving the accuracy of the prediction of the indoor air dew point temperature.

[0281] The ventilation system 100l according to the twelfth embodiment described above has the same effects as the ventilation system 100a according to the first embodiment described above.

[0282] In addition, when the determination unit 2 of the ventilation system 100l calculates the water vapor pressure using the above-mentioned equation (7), the determination unit 2 uses the air pressure acquired by the air pressure acquisition unit 12, which is the current air pressure, thereby improving the accuracy of prediction of the dew point temperature of the indoor air and improving the accuracy of prediction of the occurrence of condensation on the windows.

[0283] Next, the hardware configuration of each of the control units 80 according to the first to twelfth embodiments will be described. The control units 80 according to the first to twelfth embodiments correspond to the system control unit 5 of the system main body unit 1, the ventilation fan control unit 24 of the ventilation fan 20, the server control unit 5b of the server 1a, the indoor unit control unit 35 of the indoor unit 30a of the air conditioner 30, the remote control control unit 45 of the remote control 40, and the terminal control unit 55 of the terminal device 50. Each function of the control unit 80 according to the first to twelfth embodiments is realized by a processing circuit. The processing circuit may be dedicated hardware, or may be a processing device that executes a program stored in a storage device.

[0284] When the processing circuit is a dedicated hardware, the processing circuit may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an application specific integrated circuit, a field programmable gate array, or a combination of these. Figure 39 is a diagram showing a configuration in which the functions of the control unit according to the first to twelfth embodiments are realized by hardware. A logic circuit 81a that realizes the function of the control unit 80 is incorporated in the processing circuit 81.

[0285] When the processing circuit 81 is a processing device, the functions of the control unit 80 are realized by software, firmware, or a combination of software and firmware.

[0286] FIG. 40 is a diagram showing a configuration in which the functions of the control unit according to the first to twelfth embodiments are realized by software. The processing circuit 81 has a processor 811 that executes a program 81b, a random access memory 812 that the processor 811 uses as a work area, and a storage device 813 that stores the program 81b. The processor 811 deploys the program 81b stored in the storage device 813 on the random access memory 812 and executes it, thereby realizing the function of the control unit 80. The software or firmware is written in a program language and stored in the storage device 813. The processor 811 can be exemplified by a central processing unit, but is not limited to this. The storage device 813 can be a semiconductor memory such as a random access memory (RAM), a read only memory (ROM), a flash memory, an erasable programmable read only memory (EPROM), or an electrically erasable programmable read only memory (EEPROM (registered trademark)). The semiconductor memory may be a non-volatile memory or a volatile memory. Further, in addition to a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc) can be applied to the storage device 813. The processor 811 may output data such as a calculation result to the storage device 813 for storage, or may store the data in an auxiliary storage device (not shown) via the random access memory 812. By integrating the processor 811, the random access memory 812, and the storage device 813 on one chip, the functions of the control unit 80 can be realized by a microcomputer.

[0287] The processing circuit 81 realizes the functions of the control unit 80 by reading and executing the program 81b stored in the storage device 813. It can also be said that the program 81b causes a computer to execute procedures and methods for realizing the functions of the control unit 80.

[0288] In addition, the processing circuit 81 may be configured so that some of the functions of the control unit 80 are realized by dedicated hardware, and some of the functions of the control unit 80 are realized by software or firmware.

[0289] Thus, the processing circuitry 81 can realize each of the above-described functions by hardware, software, firmware, or a combination of these.

[0290] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, or the embodiments may be combined with each other. Also, parts of the configurations may be omitted or modified without departing from the spirit of the invention.

[0291] Various aspects of the present disclosure are summarized below as appendices.

[0292] (Appendix 1) A ventilation fan for ventilating a room equipped with a window; An environmental information acquisition unit that detects environmental information, which is information regarding the air environment around the window; a determination unit that predicts the occurrence of condensation on the window at a first future time based on a predicted value of a surface temperature of the window at a first future time and a predicted value of a dew point temperature of the indoor air at the first future time, the predicted value being calculated based on the environmental information detected by the environmental information acquisition unit; and Equipped with when the determination unit predicts the occurrence of condensation on the window at the first time, control a first condensation suppression operation mode in which an exhaust air volume of the ventilation fan is increased at a second time before the first time; A ventilation system characterized by: (Appendix 2) The environmental information acquisition unit An indoor temperature acquisition unit that detects an indoor temperature in the room; An indoor humidity acquisition unit that detects indoor humidity in the room; an outdoor temperature acquisition unit that detects an outdoor temperature; 2. The ventilation system of claim 1, comprising: (Appendix 3) The determination unit is disposed in a server capable of communicating with the ventilation fan via the Internet; 2. The ventilation system of claim 1, (Appendix 4) An air conditioner is provided in the room, when the exhaust fan increases an exhaust air volume at the second time, the determination unit controls a second condensation suppression operation mode in which a direction of the heated air blown out by the air conditioner into the room is adjusted so that the heated air is directed toward the window; 2. The ventilation system of claim 1, (Appendix 5) a remote controller that transmits to the air conditioner a control instruction command for remotely controlling the air conditioner; when the air conditioner receives operation switching instruction information from the remote controller instructing the air conditioner to switch its operating state to the second condensation prevention operation mode, the air conditioner transitions to the second condensation prevention operation mode; 5. The ventilation system of claim 4, (Appendix 6) the ventilation fan transitions to the first condensation suppression operation mode when the air conditioner transitions to the second condensation suppression operation mode; 6. The ventilation system according to claim 4 or 5, (Appendix 7) A terminal device for remotely controlling the ventilation fan is provided, the determination unit controls the first condensation prevention operation mode when operation switch instruction information instructing a switch of the operation state to the first condensation prevention operation mode is received from the terminal device; 5. The ventilation system of claim 4, (Appendix 8) when the ventilation fan has shifted to the first condensation suppression operation mode, the air conditioner shifts to the second condensation suppression operation mode; 8. The ventilation system of claim 7, (Appendix 9) an indoor image acquisition unit that acquires information about an object in the room as an indoor image; the determination unit identifies a position of the window based on the indoor image and controls the second condensation suppression operation mode; 9. The ventilation system according to any one of claims 4 to 8, (Appendix 10) an indoor image acquisition unit that acquires information about objects in the room as an indoor image; when it is determined that a person is present in the room based on the indoor image, the determination unit cancels the second condensation suppression operation mode and controls a wind direction of the heated air so as to blow the heated air toward the person; 10. The ventilation system according to any one of claims 4 to 9, (Appendix 11) A terminal device for remotely controlling the ventilation fan is provided, the terminal device displays the indoor image, and acquires window position information that is information on the position of the window in the indoor image; the determination unit identifies a position of a window in the room based on the indoor image and the window position information, and controls the second condensation suppression operation mode; 10. The ventilation system of claim 9, (Appendix 12) an infrared sensor for measuring a surface temperature within the room and generating a thermal image of the room; the determining unit determines that a location in the room where a difference between a temperature in the thermal image and a predicted value of a surface temperature of a window is within a predetermined range is the location of the window; 11. The ventilation system according to any one of claims 4 to 10, (Appendix 13) A thermometer is provided to detect the surface temperature of the window on the indoor side, the determination unit corrects the predicted value of the window surface temperature with a current value of the window surface temperature detected by the thermometer; 10. The ventilation system according to any one of claims 1 to 9, (Appendix 14) A thermometer is provided to detect the surface temperature of the window on the indoor side, The air conditioner performs a heating operation with a plurality of different wind directions of the heating air, the determination unit controls the direction of the heating airflow based on a direction in which the surface temperature of the window is the highest among a plurality of directions; 14. The ventilation system according to any one of claims 4 to 13, (Appendix 15) an indoor image acquisition unit that acquires information about objects in the room as indoor images; A terminal device that remotely controls the ventilation fan; Equipped with When the window is not shown in the indoor image, the determination unit acquires information on a position close to the window in the indoor image from the terminal device; and The air conditioner performs a heating operation with a plurality of different wind directions of the heating air toward a peripheral area close to the window in the room, the determination unit controls the direction of the heating airflow based on a direction in which the surface temperature of the window is the highest among a plurality of directions; 15. The ventilation system of claim 14. (Appendix 16) The thermometer acquires position information of the thermometer and transmits it to the determination unit; the determination unit determines a position of the thermometer as a position of the window; 16. The ventilation system according to any one of claims 13 to 15, (Appendix 17) The ventilator is a heat exchange type ventilator, the determination unit controls the heat exchange type ventilation fan so that an exhaust air volume is greater than an intake air volume in the first condensation prevention operation mode; 17. The ventilation system according to any one of claims 1 to 16, (Appendix 18) The heat exchange type ventilation fan is a heat exchanger for exchanging heat or humidity between the intake air flow and the exhaust air flow; a damper for reducing a proportion of the exhaust airflow passing through the heat exchanger; 18. The ventilation system of claim 17, comprising: (Appendix 19) 1. A method for predicting the occurrence of condensation on a window in a ventilation system, comprising: A step in which the ventilation system acquires and stores environmental information, which is information about the air environment around the window, at predetermined times; A step in which the ventilation system calculates a predicted value of the environmental information at a specific time in the future using the environmental information for a predetermined retention period; A ventilation system calculates a predicted value of a surface temperature of the window and a predicted value of a dew point temperature of indoor air by using the predicted value of the environmental information at the specific time; a ventilation system predicting that condensation will occur on the window at the specific time when a predicted value of the surface temperature of the window is lower than a predicted value of a dew point temperature of the indoor air at the specific time; A method for predicting condensation comprising: (Appendix 20) The environmental information is information on indoor temperature, indoor humidity, and outdoor temperature; 20. The method for predicting condensation according to claim 19, (Appendix 21) The environmental information further includes atmospheric pressure information; 21. The method for predicting condensation according to claim 20, (Appendix 22) Use of meteorological information as information on outdoor temperature and air pressure; 22. The method for predicting condensation according to claim 21, (Appendix 23) The ventilation system stores the environmental information for a predetermined retention period only; 23. The method for predicting condensation according to any one of claims 19 to 22. (Appendix 24) correcting the predicted value of the environmental information with a current value of the environmental information; The method for predicting condensation according to any one of claims 19 to 23, [Explanation of symbols]

[0293] 1 System main body, 1a Server, 2 Determination unit, 3 Data storage unit, 4 System communication unit, 4a Server communication unit, 5 System control unit, 5b Server control unit, 6 Indoor temperature acquisition unit, 7 Indoor humidity acquisition unit, 8 Outdoor temperature acquisition unit, 9 Indoor image acquisition unit, 10 Infrared sensor, 11 Thermometer, 12 Air pressure acquisition unit, 20 Ventilator, 21 Exhaust blower, 22 Ventilator fan memory unit, 23 Ventilator fan communication unit, 24 Ventilator fan control unit, 30 Air conditioner, 30a Indoor unit, 31 Indoor unit sensor, 32 Air direction adjustment unit, 33 Indoor unit memory unit, 34 Indoor unit communication unit, 35 Indoor unit control unit, 40 Remote controller, 41 Remote controller operation unit, 42 Remote controller display unit, 43 Remote controller memory unit, 44 Remote controller communication unit, 45 Remote controller control unit, 50 Terminal device, 51 Terminal operation unit, 52 Terminal display unit, 53 Terminal memory unit, 54 terminal communication unit, 55 terminal control unit, 60, 60a heat exchange type ventilation fan, 61 main body, 61a housing, 61b one end surface, 61c other end surface, 61d outside air intake port, 61e supply air outlet port, 61f indoor air intake port, 61g exhaust air outlet port, 62 supply air duct, 63 exhaust air duct, 64 supply air blower, 65 exhaust air blower, 66 heat exchanger, 67 heat exchange type ventilation fan control unit, 68 exhaust side bypass air duct, 69 exhaust air duct switching damper, 80 control unit, 81 processing circuit, 81a logic circuit, 81b program, 100a, 100b, 100c, 100d, 100e, 100f, 100g, 100h, 100i, 100j, 100k, 100l Ventilation system, 200 Internet, 311 indoor temperature sensor, 312 indoor humidity sensor, 411 condensation suppression button, 521 indoor image, 522 operation switch button, 523 selection screen, 524 strong ventilation button, 525 weak ventilation button, 526 condensation suppression button, 527 stop button, 811 processor, 812 random access memory, 813 storage device, R1, R2, R3, R4, R5, R6, R7, R8, R9 areas.

Claims

1. A ventilation fan for ventilating a room equipped with a window; An environmental information acquisition unit that detects environmental information, which is information regarding the air environment around the window; a determination unit that predicts the occurrence of condensation on the window at a first future time based on a predicted value of a surface temperature of the window at a first future time and a predicted value of a dew point temperature of the air in the room at the first future time, the predicted value being calculated based on the environmental information detected by the environmental information acquisition unit; and Equipped with when the determination unit predicts the occurrence of condensation on the window at the first time, control a first condensation suppression operation mode in which an exhaust air volume of the ventilation fan is increased at a second time before the first time; A ventilation system characterized by:

2. The environmental information acquisition unit An indoor temperature acquisition unit that detects an indoor temperature in the room; An indoor humidity acquisition unit that detects indoor humidity in the room; an outdoor temperature acquisition unit that detects an outdoor temperature; 2. The ventilation system of claim 1, comprising:

3. The determination unit is disposed in a server capable of communicating with the ventilation fan via the Internet; The ventilation system according to claim 1 .

4. An air conditioner is provided in the room, the determination unit controls a second condensation suppression operation mode in which, when the exhaust fan increases an exhaust air volume at the second time, a direction of the heated air blown out by the air conditioner into the room is adjusted so that the heated air is directed toward the window; The ventilation system according to claim 1 .

5. a remote controller that transmits to the air conditioner a control instruction command for remotely controlling the air conditioner; the air conditioner transitions to the second condensation prevention operation mode when operation switching instruction information instructing a switch of an operation state to the second condensation prevention operation mode is received from the remote controller; 5. The ventilation system according to claim 4,

6. the ventilation fan transitions to the first condensation suppression operation mode when the air conditioner transitions to the second condensation suppression operation mode; The ventilation system according to claim 5 .

7. A terminal device for remotely controlling the ventilation fan is provided, the determination unit controls the first condensation prevention operation mode when operation switch instruction information instructing a switch of the operation state to the first condensation prevention operation mode is received from the terminal device; 5. The ventilation system according to claim 4,

8. the air conditioner transitions to the second condensation suppression operation mode when the ventilation fan transitions to the first condensation suppression operation mode; 8. The ventilation system according to claim 7,

9. an indoor image acquisition unit that acquires information about objects in the room as an indoor image; the determination unit identifies a position of the window based on the indoor image and controls the second condensation suppression operation mode; 5. The ventilation system according to claim 4,

10. When the determination unit determines that a person is present in the room based on the indoor image, the determination unit cancels the second condensation suppression operation mode and controls the direction of the heated air so as to direct the heated air at the person.

10. The ventilation system according to claim 9,

11. A terminal device for remotely controlling the ventilation fan is provided, the terminal device displays the indoor image, and acquires window position information that is information on the position of the window in the indoor image; the determination unit identifies a position of a window in the room based on the indoor image and the window position information, and controls the second condensation suppression operation mode; 10. The ventilation system according to claim 9,

12. an infrared sensor for measuring a surface temperature within the room and generating a thermal image of the room; the determining unit determines that a location in the room where a difference between a temperature in the thermal image and a predicted value of a surface temperature of a window is within a predetermined range is the location of the window; 5. The ventilation system according to claim 4,

13. A thermometer is provided to detect the surface temperature of the window on the indoor side, the determination unit corrects the predicted value of the window surface temperature with a current value of the window surface temperature detected by the thermometer; The ventilation system according to claim 1 .

14. A thermometer is provided to detect the surface temperature of the window on the indoor side, The air conditioner performs a heating operation with a plurality of different wind directions of the heating air, the determination unit controls the direction of the heating airflow based on a direction in which the surface temperature of the window is the highest among a plurality of directions; 5. The ventilation system according to claim 4,

15. an indoor image acquisition unit that acquires information about objects in the room as an indoor image; A terminal device that remotely controls the ventilation fan; Equipped with When the window is not shown in the indoor image, the determination unit acquires information on a position close to the window in the indoor image from the terminal device; and The air conditioner performs a heating operation with a plurality of different wind directions of the heating air toward a peripheral area close to the window in the room, the determination unit controls the direction of the heating airflow based on a direction in which the surface temperature of the window is the highest among a plurality of directions; 15. The ventilation system according to claim 14,

16. The thermometer acquires position information of the thermometer and transmits it to the determination unit; the determination unit determines a position of the thermometer as a position of the window; 15. The ventilation system of claim 14.

17. The ventilator is a heat exchange type ventilator, the determination unit controls the heat exchanger-type ventilation fan so that an exhaust air volume is greater than an intake air volume in the first condensation suppression operation mode; The ventilation system according to claim 1 .

18. The heat exchange type ventilator includes: a heat exchanger for exchanging heat or humidity between the intake air flow and the exhaust air flow; a damper for reducing a proportion of the exhaust airflow passing through the heat exchanger; 20. The ventilation system according to claim 17, comprising:

19. 1. A method for predicting the occurrence of condensation on a window in a ventilation system, comprising: A step in which the ventilation system acquires and stores environmental information, which is information about the air environment around the window, at predetermined times; A step in which the ventilation system calculates a predicted value of the environmental information at a specific time in the future using the environmental information for a predetermined retention period; A ventilation system calculates a predicted value of a surface temperature of the window and a predicted value of a dew point temperature of indoor air by using the predicted value of the environmental information at the specific time; a ventilation system predicting that condensation will occur on the window at the specific time when a predicted value of the surface temperature of the window is lower than a predicted value of a dew point temperature of the indoor air at the specific time; A method for predicting condensation comprising:

20. The environmental information is information on indoor temperature, indoor humidity, and outdoor temperature; The method for predicting condensation according to claim 19 .

21. The environmental information further includes atmospheric pressure information; The method for predicting condensation according to claim 20 .

22. Use of meteorological information as information on outdoor temperature and air pressure; The method for predicting condensation according to claim 21 .

23. The ventilation system stores the environmental information for a predetermined retention period only; The method for predicting condensation according to claim 19 .

24. correcting the predicted value of the environmental information with a current value of the environmental information; The method for predicting condensation according to claim 19 .

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