Ventilation system and building

Abstract

To provide a ventilation system and a building that can suppress the occurrence of indoor dew condensation.SOLUTION: A ventilating system 1 for ventilating a house 2 having an LDK 3 provided with an air conditioner 7, includes: a heat-exchange ventilating device 10 capable of ventilating the house 2 for 24 hours; a local ventilation device 100 capable of locally ventilating the house 2; and a control device 120 capable of controlling the heat-exchange ventilation device 10 and the local ventilation device 100. The control device 120 compares a dew-point temperature of outside air taken into the heat-exchange ventilation device 10 with the room temperature in the LDK 3 during a cooling operation of the air conditioner 7 to determine a degree of risk of occurrence of dew condensation in the room, and if it determines that the degree of the risk of occurrence of dew condensation in the room is high (YES in step S12), it executes at least one of control (step S15) for reducing the exhaust of the heat-exchange ventilation device 10 and control (step S14) for stopping the operation of the local ventilation device 100.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to ventilation systems and building technology for providing ventilation. [Background technology]

[0002] Conventionally, ventilation systems and building technologies for performing ventilation have been publicly known, as described in, for example, Patent Document 1.

[0003] Patent Document 1 describes a technology that adjusts the exhaust volume of a heat exchange ventilator for 24-hour ventilation according to the operating status of local ventilation. In buildings, when a range hood or the like is used, the balance between the intake and exhaust volumes in the building is lost, causing negative pressure in the room, increasing the amount of outside air entering through gaps in the building and reducing comfort. In the technology described in Patent Document 1, in order to eliminate the loss of comfort caused by negative pressure in the room, excessive ventilation is eliminated by reducing the exhaust volume of the heat exchange ventilator.

[0004] In recent years, people have tended to use air conditioners for longer periods of time due to lifestyle changes such as spending more time at home. In addition, the outside air in summer is becoming more humid due to climate change, and this humid air enters buildings, increasing the risk of condensation. A common example of condensation in summer is condensation in hidden areas such as inside walls. Highly humid air enters from the attic, between floors, or under the floor through gaps such as wiring penetrations in partition walls, and condensation occurs on the back side of walls that have been cooled by long-term air conditioning.

[0005] The technology described in Patent Document 1 only adjusts the exhaust volume of the heat exchange ventilator based on information on whether local ventilation is on or off, which is insufficient to reduce the risk of condensation. Therefore, a ventilation system and a building that can suppress the occurrence of condensation indoors are desired. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6289289 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and the problem that the present invention aims to solve is to provide a ventilation system and a building that can suppress the occurrence of condensation indoors. [Means for solving the problem]

[0008] The problem to be solved by the present invention has been described above, and the means for solving this problem will now be described.

[0009] That is, in claim 1, a ventilation system for ventilating a building having a room equipped with an air conditioning unit is provided, comprising a first ventilation device capable of performing 24-hour ventilation of the building, a second ventilation device capable of performing local ventilation of the building, and a control device capable of controlling the first ventilation device and the second ventilation device, wherein during cooling operation of the air conditioning unit, the control device determines a condensation risk indicating the degree of risk of condensation occurring indoors by comparing the dew point temperature of the outside air taken in by the first ventilation device with the room temperature of the room, and if it is determined that the condensation risk is high, it executes at least one of control to reduce the exhaust volume of the first ventilation device or control to stop operation of the second ventilation device.

[0010] In claim 2, the control device determines that the risk of condensation is high when the dew point temperature of the outside air taken into the first ventilation device remains higher than the room temperature of the room for a predetermined period of time or more.

[0011] In claim 3, the control device executes a notification urging the user to increase the set temperature of the air conditioner when the dew point temperature of the outside air taken into the first ventilation device is higher than the room temperature of the room by a predetermined threshold value or more during cooling operation of the air conditioner.

[0012] In claim 4, the control device resets the exhaust volume of the first ventilation device to the original exhaust volume when a state in which the dew point temperature of the outside air taken into the first ventilation device is lower than the room temperature of the room continues for a predetermined time or more.

[0013] In claim 5, the system includes an exhaust port communicating with the interior of the room, a return air duct connecting the exhaust port and the first ventilation device, and a return air temperature sensor provided in the return air duct and capable of detecting the temperature of the return air sucked into the first ventilation device from the exhaust port, and the control device obtains the room temperature of the room based on the temperature of the return air detected by the return air temperature sensor.

[0014] In claim 6, the present invention comprises the ventilation system according to any one of claims 1 to 5. Effect of the Invention

[0015] The present invention has the following advantages.

[0016] According to claim 1, the occurrence of condensation indoors can be suppressed.

[0017] According to claim 2, the accuracy of determining the risk of condensation can be improved.

[0018] According to claim 3, the occurrence of condensation indoors can be further suppressed.

[0019] According to claim 4, it is possible to promote ventilation while further suppressing the occurrence of condensation indoors.

[0020] According to claim 5, it is possible to reduce the variation in the detected room temperature of the room in which the air conditioner is installed.

[0021] According to claim 6, the occurrence of condensation indoors can be suppressed. [Brief description of the drawings]

[0022] [Figure 1] 1 is a front view showing a house according to one embodiment of the present invention. [Diagram 2] FIG. 1 is a block diagram showing the configuration of a ventilation system according to an embodiment of the present invention. [Diagram 3] 5 is a flowchart showing condensation risk reduction control performed by the control device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] In the following, a ventilation system 1 and a house 2 according to one embodiment of the present invention will be described with reference to Figs.

[0024] The ventilation system 1 is provided in a house 2, and ventilates the room (internal space) of the house 2. The house 2 has multiple rooms. In this embodiment, the house 2 has a living / dining / kitchen 3 (hereinafter referred to as LDK3), a hallway 4, and a bathroom / washroom 5. The LDK3 and the bathroom / washroom 5 are separated by the hallway 4. The LDK3 and the hallway 4 are separated by a partition wall 6. An air conditioner 7 is provided in the LDK3.

[0025] The air conditioner 7 conditions the indoor space. The air conditioner 7 is provided in an appropriate location in the living / dining kitchen 3, and can be operated (cooling operation and heating operation) to adjust the indoor temperature of the living / dining kitchen 3. The air conditioner 7 is connected to an outdoor unit (not shown), and can circulate a refrigerant between the outdoor unit and the air conditioner 7. The air conditioner 7 is configured to draw in indoor air of the living / dining kitchen 3, adjust the temperature of the air by exchanging heat between the drawn-in air and the refrigerant, and discharge the air.

[0026] The air conditioner 7 is equipped with a control panel (not shown) that can be operated by the user, and is configured so that the set temperature can be input via the control panel. A temperature sensor (not shown) is provided near the air intake of the air conditioner 7. The air conditioner 7 can be operated based on the set temperature and the detection result of the temperature sensor.

[0027] The house 2 configured in this manner is provided with a ventilation system 1. The ventilation system 1 mainly includes a heat exchange ventilator 10, an intake pipe 20, an exhaust pipe 30, an intake duct 40, a return air duct 50, an intake grill 60, an exhaust grill 70, an outside air temperature and humidity sensor 80, a return air temperature sensor 90, a local ventilation device 100, a notification unit 110, and a control device 120.

[0028] The heat exchange ventilator 10 is for supplying air to the room of the house 2 and exhausting air to the outside. The heat exchange ventilator 10 is a heat recovery type ventilator that performs the first type of ventilation. Specifically, the heat exchange ventilator 10 is configured to recover heat from the air taken in from the room during exhaust, for example, in winter, and to transfer heat to the air taken in from the outside during supply. Also, the heat exchange ventilator 10 is configured to recover heat from the air taken in from the outside during supply, for example, in summer, and to transfer heat to the air taken in from the room during exhaust. The heat exchange ventilator 10 can perform 24-hour ventilation in the room of the house 2 by supplying and exhausting air. The heat exchange ventilator 10 is installed in an appropriate location above the ceiling. In this embodiment, the heat exchange ventilator 10 is installed above the ceiling of the bathroom washroom 5. One end of an air supply pipe 20 and an exhaust pipe 30 that communicate with the outside are connected to the heat exchange ventilator 10.

[0029] The heat exchange ventilator 10 includes an intake fan and an exhaust fan, not shown. By rotating the intake fan, the heat exchange ventilator 10 can perform an intake operation in which it takes in outside air through an intake pipe 20 and supplies (blows) the outside air into the room through an intake duct 40, which will be described later. In addition, by rotating the exhaust fan, the heat exchange ventilator 10 can perform an exhaust operation in which it takes in indoor air through a return air duct 50, which will be described later, and exhausts the air to the outside through an exhaust pipe 30.

[0030] The air supply duct 40 constitutes an air supply path for supplying air from the heat exchange ventilator 10 to the room. The air supply duct 40 is formed in a cylindrical shape that allows air to flow inside. One end of the air supply duct 40 is connected to the heat exchange ventilator 10. The other end of the air supply duct 40 is connected to an air supply grill 60, which will be described later. The air supply duct 40 is formed so as to branch off midway from the heat exchange ventilator 10 and extend to each air supply grill 60.

[0031] The return air duct 50 constitutes an exhaust path for supplying indoor air to the heat exchange ventilator 10. The return air duct 50 is formed in a cylindrical shape through which air can flow. One end of the return air duct 50 is connected to an exhaust grill 70, which will be described later. The other end of the return air duct 50 is connected to the heat exchange ventilator 10.

[0032] The air intake grill 60 is an air intake port that communicates with the living / dining kitchen 3, and is an outlet (blowout port) for air sent in through the air intake duct 40. The air intake grill 60 is provided in the ceiling part of the living / dining kitchen 3. In this embodiment, two air intake grills 60 are provided. The air intake grill 60 is connected to the other end of the air intake duct 40 (the end opposite to the connection part with the heat exchange ventilator 10).

[0033] The exhaust grill 70 is an exhaust port communicating with the living / dining kitchen 3, and is an inlet (suction port) for indoor air to the return air duct 50. The exhaust grill 70 is connected to the other end of the return air duct 50 (the end opposite to the connection with the heat exchange ventilator 10).

[0034] The outside air temperature and humidity sensor 80 detects the temperature and humidity of the outside air taken into the air intake pipe 20 from outdoors. The outside air temperature and humidity sensor 80 is provided in the middle of the air intake pipe 20.

[0035] The return air temperature sensor 90 detects the temperature of the return air returning to the heat exchange ventilator 10 from the exhaust grill 70. The return air temperature sensor 90 is provided in the middle of the return air duct 50. More specifically, the return air temperature sensor 90 is provided in the vicinity of the exhaust grill 70.

[0036] The local ventilation device 100 performs local ventilation by performing ventilation at a required volume when necessary in order to remove moisture and odors. The local ventilation device 100 includes a range hood 101 and a ventilator fan 102.

[0037] The range hood 101 exhausts air to the outdoors. The range hood 101 is provided on a wall of the living / dining / kitchen area 3 facing the outdoors, and can perform an exhaust operation to exhaust air from inside the living / dining / kitchen area 3, etc., to the outdoors via a duct 101a that communicates with the outdoors.

[0038] Ventilation fan 102 exhausts air to the outdoors. Ventilation fan 102 is provided on the wall of bathroom vanity room 5, and can perform an exhaust operation to exhaust air from within a room such as bathroom vanity room 5 to the outdoors.

[0039] The notification unit 110 notifies information by voice. For example, a speaker is used as the notification unit 110. The notification unit 110 is provided at an appropriate location in the living / dining / kitchen area 3, for example, near the air conditioner 7.

[0040] 2 controls various components of the ventilation system 1. The control device 120 includes a storage unit such as a RAM, a ROM, and a HDD, and an arithmetic processing unit such as a CPU. The control device 120 stores various information and programs for controlling the various components of the ventilation system 1.

[0041] The control device 120 is electrically connected to the outdoor temperature and humidity sensor 80, and can acquire information (outdoor temperature and humidity) detected by the outdoor temperature and humidity sensor 80. The control device 120 is also electrically connected to the return air temperature sensor 90, and can acquire information (return air temperature) detected by the return air temperature sensor 90. The control device 120 can control the operation of the heat exchange ventilator 10 and the local ventilator 100 (the range hood 101 and the exhaust fan 102) based on the outdoor air temperature and humidity measured by the outdoor temperature and humidity sensor 80, and the return air temperature measured by the return air temperature sensor 90, and the like. The control device 120 is also electrically connected to the notification unit 110, and can control the operation of the notification unit 110.

[0042] In the house 2 equipped with the ventilation system 1 configured in this manner, the heat exchange ventilator 10 operates in an air supply mode to take in outdoor air through the air supply pipe 20 and supply (supply) the air into the room through the air supply duct 40 and the air supply grill 60. More specifically, when the heat exchange ventilator 10 operates in an air supply mode, outdoor air is first supplied to the living / dining / kitchen area 3 through the air supply pipe 20 and the air supply duct 40. The air supplied to the living / dining / kitchen area 3 is supplied to the hallway 4 through a gap such as an undercut under the door of the living / dining / kitchen area 3. The air supplied to the hallway 4 is supplied to the bathroom / washroom 5 through a gap such as an undercut under the door of the bathroom / washroom 5.

[0043] Furthermore, when the heat exchange ventilator 10 is in exhaust operation, it takes in indoor air through the exhaust grille 70 and the return air duct 50 and exhausts (discharges) the air to the outdoors through the exhaust pipe 30. More specifically, when the heat exchange ventilator 10 is in exhaust operation, the indoor air in the bathroom / vanity room 5 is drawn into the hallway 4 through a gap such as an undercut under the door of the bathroom / vanity room 5. The air drawn into the hallway 4 is drawn into the living / dining / kitchen kitchen 3 through a gap such as an undercut under the door of the living / dining / kitchen kitchen 3. The air drawn into the living / dining / kitchen kitchen 3 is drawn into the heat exchange ventilator 10 through the exhaust grille 70 and the return air duct 50 and is exhausted to the outdoors through the exhaust pipe 30.

[0044] In this manner, the heat exchange ventilator 10 performs the exhaust operation and the supply operation, so that the interior of the house 2 can be ventilated.

[0045] Here, when the local ventilation device 100 (range hood 101 and exhaust fan 102) is in use, the balance between the amount of air supplied and the amount of air exhausted inside the house 2 may be lost, causing negative pressure inside the house 2. When negative pressure occurs inside the house, humid outside air in summer is taken inside the house and may enter the inside of the partition wall 6 between the living / dining / kitchen area 3 and the hallway 4 through gaps such as through holes for inserting wiring. When this happens, the partition wall 6 adjacent to the living / dining / kitchen area 3 is cooled by the long-term cooling operation of the air conditioner 7, making it easy for condensation to occur on the back side of the wall surface of the partition wall 6, etc.

[0046] Therefore, in the ventilation system 1 according to this embodiment, condensation risk reduction control for reducing the risk of condensation is performed by the control device 120. Here, the "risk of condensation" indicates the degree of risk of condensation occurring indoors.

[0047] Hereinafter, the flow of the condensation risk reduction control will be described with reference to the flowchart of Fig. 3. The condensation risk reduction control shown in Fig. 3 is repeatedly executed at all times.

[0048] In step S11, the control device 120 acquires the outdoor air temperature and humidity, and the return air temperature. Specifically, the control device 120 acquires the outdoor air temperature (outdoor air temperature) and humidity (outdoor air humidity) detected by the outdoor air temperature and humidity sensor 80. The control device 120 also acquires the return air temperature (return air temperature) detected by the return air temperature sensor 90.

[0049] After performing the process of step S11, the control device 120 proceeds to step S12.

[0050] In step S12, the control device 120 determines whether the state of "outdoor air dew point temperature" ≧ "return air temperature -1°C" has continued for 30 minutes or more. Specifically, the control device 120 calculates the outdoor air dew point temperature (the temperature at which condensation occurs when gas is cooled) based on the outdoor air temperature and outdoor air humidity acquired in step S11. Then, the control device 120 compares the "outdoor air dew point temperature" with the "return air temperature -1°C" to determine whether the state of "outdoor air dew point temperature" ≧ "return air temperature -1°C" has continued for 30 minutes or more.

[0051] It should be noted that the "return air temperature -1°C" is acquired as the room temperature of the LDK 3. That is, the control device 120 acquires the room temperature of the LDK 3 based on the return air temperature detected by the return air temperature sensor 90.

[0052] Here, the room temperature in the LDK 3 varies depending on the location of the LDK 3 due to factors such as the distance from the installation location of the air conditioner 7 and the wind direction of the air conditioner 7. For this reason, if a temperature sensor were installed in the LDK 3, the detected temperature would vary depending on the installation location of the temperature sensor. Therefore, by installing the return air temperature sensor 90 in the return air duct 50 through which the air from the entire room of the LDK 3 is sucked in, it is possible to reduce the variation in the detected temperature depending on the installation location of the temperature sensor.

[0053] In addition, since warm air tends to gather at the top in the living / dining kitchen 3, relatively warm air from the upper part of the living / dining kitchen 3 is likely to be sucked into the return air duct 50 from the exhaust grill 70 installed on the ceiling surface of the living / dining kitchen 3. Taking this temperature difference between the top and bottom into consideration, "-1°C" is added to the return air temperature.

[0054] When the control device 120 determines that the state of "outdoor dew point temperature" ≧ "return air temperature -1°C" has continued for 30 minutes or more ("YES" in step S12), it proceeds to step S13. On the other hand, when the control device 120 determines that the state of "outdoor dew point temperature" ≧ "return air temperature -1°C" has not continued for 30 minutes or more ("NO" in step S12), it ends the flow of condensation risk reduction control shown in FIG. 3.

[0055] Note that the state of "outdoor dew point temperature" ≧ "return air temperature -1°C" means that there is a high possibility of condensation occurring when the outdoor air taken indoors is cooled to the room temperature of the living / dining kitchen 3 (i.e., the risk of condensation is high and condensation is likely to occur). Therefore, if the state of "outdoor dew point temperature" ≧ "return air temperature -1°C" continues for 30 minutes or more ("YES" in step S12), the process from step S13 onwards is carried out to take measures against condensation.

[0056] In step S13, the control device 120 determines whether the local ventilation device 100 is in operation. Specifically, when at least one of the range hood 101 or the exhaust fan 102 is in exhaust operation (ON), the control device 120 determines that the local ventilation device 100 is in operation. On the other hand, when both the range hood 101 and the exhaust fan 102 are not in operation (OFF), the control device 120 determines that the local ventilation device 100 is not in operation.

[0057] If the control device 120 determines that the local ventilation device 100 is in operation ("YES" in step S13), the process proceeds to step S14. On the other hand, if the control device 120 determines that the local ventilation device 100 is not in operation ("NO" in step S13), the process proceeds to step S15.

[0058] In step S14, the control device 120 turns off the local ventilation device 100. Specifically, if the range hood 101 is in operation, the control device 120 turns off the operating range hood 101. Also, if the exhaust fan 102 is in operation, the control device 120 turns off the operating exhaust fan 102.

[0059] After performing the process of step S14, the control device 120 proceeds to step S15.

[0060] In step S15, the control device 120 reduces the amount of exhaust air from the heat exchanger ventilator 10. Specifically, the control device 120 reduces the air volume of an exhaust fan (not shown) of the heat exchanger ventilator 10, thereby reducing the amount of exhaust air discharged from the heat exchanger ventilator 10 to the outdoors through the exhaust pipe 30.

[0061] In this way, when the risk of condensation is high and conditions are favorable for condensation to occur indoors, the local ventilation device 100 (range hood 101, ventilation fan 102) in operation is turned off to eliminate the negative pressure indoors (steps S14, S15), thereby preventing high humidity outside air from being taken into the room. This makes it possible to alleviate conditions favorable for condensation to occur.

[0062] After performing the process of step S15, the control device 120 proceeds to step S16.

[0063] In step S16, the control device 120 determines whether the "outdoor dew point temperature" is 2° C. or more higher than the "return air temperature -1° C.." Specifically, the control device 120 again acquires the outdoor air temperature, outdoor air humidity, and return air temperature (see step S11), and compares the "outdoor dew point temperature" with the "return air temperature -1° C.," to determine whether the "outdoor dew point temperature" is 2° C. or more higher than the "return air temperature -1° C.."

[0064] If the control device 120 determines that the "outdoor dew point temperature" is 2°C or more higher than the "return air temperature -1°C" ("YES" in step S16), it proceeds to step S17. On the other hand, if the control device 120 determines that the "outdoor dew point temperature" is not 2°C or more higher than the "return air temperature -1°C" ("NO" in step S16), it proceeds to step S18.

[0065] When the "outdoor dew point temperature" is 2°C or more higher than the "return air temperature -1°C" (YES in step S16), it means that the state is prone to condensation, for example because the room temperature of LDK3 is too low compared to the outdoor air temperature (the air conditioning is too effective). On the other hand, when the "outdoor dew point temperature" is not 2°C or more higher than the "return air temperature -1°C" (NO in step S16), it means that the room temperature of LDK3 is close to the outdoor air temperature, and the state is not prone to condensation.

[0066] In step S17, the control device 120 issues an announcement via the notification unit 110 encouraging the raising of the set temperature of the air conditioner 7. The residents in the living / dining kitchen 3 can raise the set temperature of the air conditioner 7 upon receiving the announcement from the notification unit 110. By raising the set temperature of the air conditioner 7, the room temperature of the living / dining kitchen 3 can be raised (closer to the outside air temperature).

[0067] After performing the process of step S17, the control device 120 proceeds to step S18.

[0068] In step S18, the control device 120 judges whether the state where "outdoor dew point temperature"<"return air temperature-1°C" has continued for 30 minutes or more. Specifically, the control device 120 again acquires the outdoor air temperature, outdoor air humidity, and return air temperature (see step S11), and compares the "outdoor dew point temperature" with the "return air temperature-1°C" to judge whether the state where "outdoor dew point temperature"<"return air temperature-1°C" has continued for 30 minutes or more.

[0069] If the control device 120 determines that the state where "outdoor dew point temperature"<"return air temperature-1°C" has continued for 30 minutes or more ("YES" in step S18), it proceeds to step S19. On the other hand, if the control device 120 determines that the state where "outdoor dew point temperature"<"return air temperature-1°C" has not continued for 30 minutes or more ("NO" in step S18), it performs the process of step S18 again. In other words, it does not proceed further until it becomes YES in step S18.

[0070] Note that the state where "outdoor dew point temperature"<"return air temperature -1°C" means that even if the outdoor air taken into the house is cooled to the room temperature of the living / dining kitchen 3, there is a low possibility of condensation occurring (i.e., the risk of condensation is low and condensation is unlikely to occur). Therefore, if the state where "outdoor dew point temperature"<"return air temperature -1°C" continues for 30 minutes or more ("YES" in step S18), the process of step S19 is executed to end the anti-condensation measures.

[0071] In step S19, the control device 120 restores the exhaust volume of the heat exchanger ventilator 10. Specifically, the control device 120 restores the air volume of the exhaust fan (not shown) of the heat exchanger ventilator 10 to the original air volume, and restores the exhaust volume discharged from the heat exchanger ventilator 10 to the outdoors via the exhaust pipe 30 to the original exhaust volume (the exhaust volume before being reduced in step S15).

[0072] After performing the process of step S19, the control device 120 ends the flow of the condensation risk reduction control shown in FIG.

[0073] As described above, in the ventilation system 1 according to the present embodiment, during cooling operation of the air conditioner 7 in the summer when the outdoor temperature is high, the risk of condensation occurring indoors (condensation risk) is determined based on the dew point temperature of the outdoor air taken into the heat exchange ventilator 10 through the air supply pipe 20 and the room temperature of the living room / dining kitchen 3 (the return air temperature acquired by the return air temperature sensor 90) (step S12). If the dew point temperature of the outdoor air is higher than the room temperature of the living room / dining kitchen 3 and the risk of condensation is determined to be high (YES in step S12), the local ventilation device 100 (range hood 101, exhaust fan 102) in operation is turned off and the exhaust volume of the heat exchange ventilator 10 is reduced (steps S13 to S15), thereby eliminating the negative pressure indoors.

[0074] In this way, by eliminating the negative pressure indoors when the risk of condensation is high, the amount of humid outside air taken into the room is reduced. This makes it possible to prevent condensation from occurring on the back surface of the partition wall 6, which is caused by the humid outside air coming into contact with the back surface of the partition wall 6 that has been cooled by the long-term cooling operation of the air conditioner 7.

[0075] Furthermore, if the room temperature in the living / dining / kitchen area 3 is low and there is a high risk of condensation (YES in step S16), an announcement is made encouraging residents to raise the temperature setting of the air conditioner 7 (step S17), and the residents who hear the announcement can raise the temperature setting of the air conditioner 7 to prevent the living / dining / kitchen area 3 from becoming too cold. This makes it possible to raise the surface temperature of the partition wall 6 (to bring it closer to the outside temperature), and thus makes it possible to prevent condensation from occurring on the rear surface of the partition wall 6.

[0076] As described above, the ventilation system 1 according to this embodiment has the following features: A ventilation system 1 for ventilating a house 2 (building) having an LDK 3 (room) in which an air conditioner 7 is installed, A heat exchange ventilation device 10 (first ventilation device) capable of performing 24-hour ventilation of the house 2; A local ventilation device 100 (second ventilation device) capable of performing local ventilation of the house 2; A control device 120 capable of controlling the heat exchange ventilation device 10 and the local ventilation device 100; Equipped with The control device 120 is During the cooling operation of the air conditioner 7, a dew point temperature of the outside air taken in by the heat exchange ventilation device 10 is compared with the room temperature of the living / dining / kitchen area 3 to determine a dew condensation risk indicating the degree of risk of dew condensation occurring indoors; If it is determined that the risk of condensation is high (YES in step S12), at least one of control to reduce the exhaust volume of the heat exchange ventilation device 10 (step S15) or control to stop operation of the local ventilation device 100 (step S14) is executed.

[0077] With this configuration, it is possible to suppress the occurrence of condensation indoors. Specifically, when the air conditioner 7 is in cooling operation, if the dew point temperature of the outside air taken in by the heat exchanger ventilator 10 is higher than the room temperature of the living / dining / kitchen area 3 and it is determined that there is a high risk of condensation, the local ventilation device 100 (range hood 101, exhaust fan 102) that is in operation is turned off (step S14) and the exhaust volume of the heat exchanger ventilator 10 is reduced (step S15), thereby eliminating the negative pressure indoors. By eliminating the negative pressure indoors, it is possible to prevent humid outside air from entering the interior of the partition wall 6 adjacent to the living / dining / kitchen area 3, and in turn to prevent condensation from forming on the back side of the partition wall 6 that has been cooled by the air conditioning unit 7 in cooling operation.

[0078] In addition, the control device 120 If the dew point temperature of the outside air taken in by the heat exchange ventilation device 10 remains higher than the room temperature of the LDK 3 for a predetermined period of time (e.g., 30 minutes) or more (YES in step S12), it is determined that the risk of condensation is high.

[0079] With this configuration, the accuracy of determining the risk of condensation can be improved. Specifically, when the dew point temperature of the outside air has only risen temporarily and the conditions are not conducive to condensation, it is possible to prevent the risk of condensation from being determined to be high.

[0080] In addition, the control device 120 During cooling operation of the air conditioner 7, if the dew point temperature of the outside air taken in by the heat exchange ventilation device 10 is higher than the room temperature of the LDK 3 by a predetermined threshold value (e.g., 2°C) or more (YES in step S16), a notification is issued to encourage the user to increase the set temperature of the air conditioner 7 (step S17).

[0081] With this configuration, the occurrence of condensation indoors can be further suppressed. Specifically, it is possible to encourage the room temperature of the living / dining / kitchen area 3 to approach the outside air temperature (preventing the living / dining / kitchen area 3 from becoming too cold), and in turn, it is possible to further suppress the occurrence of condensation on the rear surface of the partition wall 6, etc.

[0082] In addition, the control device 120 If the dew point temperature of the outside air taken in by the heat exchanger ventilator 10 remains lower than the room temperature of the LDK 3 for a predetermined period of time (e.g., 30 minutes) or more (YES in step S18), the exhaust volume of the heat exchanger ventilator 10 is reset to the original exhaust volume (step S19).

[0083] With this configuration, it is possible to further suppress the occurrence of condensation indoors while promoting ventilation. Specifically, if the dew point temperature of the outside air taken into the heat exchange ventilator 10 is lower than the room temperature of the LDK 3 for a predetermined period of time or more (YES in step S18), it is considered that the high risk of condensation occurring has been eliminated. When the high risk of condensation occurring has been eliminated, the exhaust volume of the heat exchange ventilator 10 can be restored to its original level to promote ventilation in the room.

[0084] In addition, the ventilation system 1 according to this embodiment is An exhaust grille 70 (exhaust port) communicating with the room of the living / dining / kitchen kitchen 3; A return air duct 50 connecting the exhaust grill 70 and the heat exchange ventilation device 10; A return air temperature sensor 90 is provided in the return air duct 50 and capable of detecting the temperature of the return air sucked into the heat exchange ventilation device 10 from the exhaust grille 70. The control device 120 obtains the room temperature of the LDK 3 based on the temperature of the return air detected by the return air temperature sensor 90.

[0085] With this configuration, it is possible to reduce the variation in the detected room temperature of the living / dining kitchen 3 in which the air conditioner 7 is installed. Specifically, by providing the return air temperature sensor 90 in the return air duct 50 through which the air from the entire room of the living / dining / kitchen area 3 is drawn in, it is possible to reduce variation in the detected temperature due to the location of the temperature sensor.

[0086] The house 2 according to this embodiment is equipped with the ventilation system 1.

[0087] With this configuration, it is possible to suppress the occurrence of condensation indoors.

[0088] Although the embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0089] For example, in this embodiment, the building according to the present invention is not limited to the house 2, but may be other buildings such as a department store, a shopping mall, a school, or a building.

[0090] In addition, in this embodiment, the notification unit 110 notifies the resident by voice to encourage him / her to increase the set temperature of the air conditioner 7, but the form of notification is not limited to voice, and the notification may be made, for example, by sending an email to a terminal held by the resident.

[0091] In addition, in this embodiment, when the indoor conditions are such that condensation is likely to occur (YES in step S16), the control device 120 issues a notification via the notification unit 110 to encourage the user to increase the set temperature of the air conditioner 7, but the control device 120 may also directly increase the set temperature of the air conditioner 7.

[0092] In addition, in this embodiment, when the indoor conditions are such that condensation is likely to occur (YES in step S12), the control device 120 executes both control to reduce the exhaust amount of the heat exchange ventilator 10 (step S15) and control to stop the operation of the local ventilation device 100 (step S14), but it may execute only one of them. In addition, in the control to stop the operation of the local ventilation devices 100 (step S14), all of the local ventilation devices 100 (range hoods 101 and exhaust fans 102) that are in operation are stopped, but it may be configured to stop some of the local ventilation devices 100 that are in operation.

[0093] In the present embodiment, the air conditioner 7 is provided in the living / dining / kitchen area 3, but may be provided in another room.

[0094] In the present embodiment, the heat exchange ventilator 10 of the heat recovery type is used as the first ventilator of the present invention, but it does not have to be of the heat recovery type. [Explanation of symbols]

[0095] 1. Ventilation system 2. Housing 3 bedrooms 7 Air conditioner 10. Ventilation system 40 Air supply duct 50 Return Air Duct 60 Air Intake Grill 70 Exhaust Grill 80 Outside temperature and humidity sensor 90 Return air temperature sensor 100 Local ventilation equipment 110 Notification Department 120 Control device

Claims

1. A ventilation system for ventilating a building having a room equipped with an air conditioning device, A first ventilation device capable of performing 24-hour ventilation of the building; A second ventilation device capable of performing local ventilation of the building; A control device capable of controlling the first ventilation device and the second ventilation device; Equipped with The control device includes: During cooling operation of the air conditioner, a dew point temperature of the outside air taken into the first ventilation device is compared with a room temperature of the room to determine a condensation risk indicating a degree of risk of condensation occurring indoors; When it is determined that the risk of condensation is high, at least one of a control to reduce an exhaust amount of the first ventilation device or a control to stop operation of the second ventilation device is executed. Ventilation system.

2. The control device includes: When a state in which a dew point temperature of the outside air taken into the first ventilation device is equal to or higher than a room temperature of the room continues for a predetermined time or more, it is determined that the risk of condensation is high.

2. The ventilation system of claim 1.

3. The control device includes: When a dew point temperature of the outside air taken into the first ventilation device is higher than a room temperature of the room by a predetermined threshold value or more during a cooling operation of the air conditioner, a notification is executed to prompt the user to increase the set temperature of the air conditioner.

2. The ventilation system of claim 1.

4. The control device includes: When a state in which the dew point temperature of the outside air taken into the first ventilation device is lower than the room temperature of the room continues for a predetermined time or more, the exhaust volume of the first ventilation device is returned to the original exhaust volume.

2. The ventilation system of claim 1.

5. an exhaust port communicating with the interior of the room; A return air duct connecting the exhaust port and the first ventilation device; A return air temperature sensor is provided in the return air duct and capable of detecting the temperature of the return air sucked into the first ventilation device from the exhaust port, The control device acquires the room temperature of the room based on the return air temperature detected by the return air temperature sensor.

2. The ventilation system of claim 1.

6. A building comprising a ventilation system according to any one of claims 1 to 5.

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