Ventilation system and building

Abstract

To provide a ventilation system capable of suppressing indoors having negative pressure excessively, and to provide a building.SOLUTION: A ventilation system 1 which performs ventilation of a housing 2 includes: a range hood 31 (local exhaustion device 30) capable of executing local exhaustion of the housing 2; and a control part 50 capable of controlling the range hood 31. The control part 50 sets an air amount upper limit value Q of the range hood 31 based on a target value of a differential pressure between an outside air pressure and an indoor pressure and an effective opening area αA of the housing 2 (step S12), and can execute air amount control operation (step S15) for operating the range hood 31 by controlling the air amount equal to or less than the air amount upper limit value Q.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 discloses a technique for adjusting the operating time of an air supply fan according to the operating time of a ventilation fan (exhaust fan) in order to eliminate excessive negative pressure in a room. By eliminating excessive negative pressure in the room in this way, it is possible to prevent high humidity outside air from entering the building in summer, and thus prevent condensation and mold from occurring.

[0004] However, the technology described in Patent Document 1 does not set the ventilation fan's air volume for each building, so depending on the opening area of ​​the building, etc., there is a risk that the ventilation volume may not be appropriate and excessive negative pressure inside the room may not be sufficiently prevented. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2023-050359 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and the problem it aims to solve is to provide a ventilation system and a building that can prevent excessive negative pressure from building up indoors. [Means for solving the problem]

[0007] The problem to be solved by the present invention has been described above, and the means for solving this problem will now be described.

[0008] That is, in claim 1, a ventilation system for ventilating a building is provided, comprising a local exhaust device capable of performing local exhaust of the building, and a control unit capable of controlling the local exhaust device, wherein the control unit is capable of setting an upper airflow limit value of the local exhaust device based on a target value of the differential pressure between the outside air pressure and the indoor pressure and on the effective opening area of ​​the building, and is capable of performing an airflow control operation for operating the local exhaust device by controlling the airflow to be equal to or lower than the upper airflow limit value.

[0009] In claim 2, the control unit sets a limited operation time of the local exhaust system, and when the operation time of the local exhaust system reaches the limited operation time, stops the operation of the local exhaust system.

[0010] In claim 3, the control unit sets the limited operation time based on a target ventilation rate of the building and the upper air volume limit value.

[0011] In claim 4, the building is provided with an air quality sensor capable of detecting at least one of the odor of the indoor air or the carbon dioxide concentration, and the control unit sets the limited operation time to the time until the odor of the indoor air or the carbon dioxide concentration falls below a predetermined threshold.

[0012] In claim 5, the present invention further comprises an air supply device that supplies air indoors, and the control unit starts operation of the air supply device while the air volume control operation of the local exhaust system is being performed.

[0013] In claim 6, the local exhaust device includes a range hood and a local exhaust fan other than the range hood, and the control unit targets the air volume control operation on the range hood and stops operation of the local exhaust fan while the air volume control operation of the range hood is being performed.

[0014] In claim 7, the present invention comprises a ventilation system according to any one of claims 1 to 6. Effect of the Invention

[0015] The present invention has the following advantages.

[0016] According to claim 1, it is possible to prevent the interior of the room from becoming excessively negative pressure.

[0017] According to claim 2, excessive negative pressure inside the room can be further prevented.

[0018] According to claim 3, it is possible to prevent the inside of the room from becoming excessively negative pressure while ensuring a sufficient amount of ventilation air.

[0019] According to claim 4, it is possible to prevent excessive negative pressure in the room while removing odor from the air in the room or while suppressing an increase in the carbon dioxide concentration.

[0020] According to claim 5, it is possible to prevent the exhaust amount from becoming excessive with respect to the supply amount during operation of the local exhaust ventilation system.

[0021] According to claim 6, it is possible to prevent the exhaust amount from becoming excessive with respect to the supply amount during operation of the local exhaust system.

[0022] According to claim 7, it is possible to prevent the interior of the room from becoming excessively negative pressure. [Brief description of the drawings]

[0023] [Figure 1] 1 is a schematic diagram showing a house according to an 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 negative pressure elimination control by a control unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] 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.

[0025] The ventilation system 1 is provided in a house 2, and ventilates the room (internal space) of the house 2. The house 2 has a plurality of rooms. In this embodiment, the house 2 has a plurality of rooms including a living / dining / kitchen 3 (hereinafter referred to as LDK3) and a living room 4 on the first floor. The house 2 also has a plurality of rooms including a living room 5 on the second floor. The rooms (LDK3, living room 4, living room 5, etc.) of the house 2 communicate with each other through gaps such as undercuts under doors. The ventilation system 1 mainly includes an input unit 10, an air quality sensor 20, a local exhaust device 30, an air supply device 40, and a control unit 50.

[0026] Various information is input to the input unit 10. A keyboard, a mouse, or the like is used as the input unit 10. For example, the opening area of ​​the house 2 and the air volume of a range hood 31, which will be described later, are input to the input unit 10.

[0027] The air quality sensor 20 detects the quality of indoor air. The air quality sensor 20 is provided in the living / dining kitchen 3. The air quality sensor 20 can detect, for example, the odor and CO2 concentration of the air in the living / dining kitchen 3.

[0028] The local exhaust device 30 performs local exhaust by exhausting air at a required volume when necessary in order to remove moisture and odors. The local exhaust device 30 includes a range hood 31 and a local exhaust fan 32.

[0029] The range hood 31 exhausts air to the outdoors. The range hood 31 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 31a that communicates with the outdoors.

[0030] The local exhaust fan 32 exhausts air to the outdoors. The local exhaust fan 32 is provided on the wall of the living room 4, and can perform an exhaust operation to exhaust air inside the living room 4 or the like to the outdoors.

[0031] The air supply device 40 supplies air indoors. For example, an air supply device that can automatically switch between natural air supply and mechanical air supply depending on the room temperature can be used as the air supply device 40. Such an air supply device 40 can perform natural air supply in summer (spring to fall) and perform mechanical air supply (air supply operation) to forcibly supply air indoors in winter when natural air supply is difficult. The air supply device 40 is installed on the ceiling of the living room 5 on the second floor, and can perform air supply operation to supply outside air into the room via a duct 40a. In this embodiment, the air volume during air supply operation of the air supply device 40 is constant.

[0032] 2 controls various components of the ventilation system 1. The control unit 50 includes a storage unit such as a RAM, a ROM, and a HDD, and an arithmetic processing unit such as a CPU. The control unit 50 stores various information and programs for controlling the various components of the ventilation system 1.

[0033] The control unit 50 is electrically connected to the input unit 10 and can acquire information input to the input unit 10. The control unit 50 is also electrically connected to the air quality sensor 20 and can acquire information detected by the air quality sensor 20 (the odor and CO2 concentration of the air in the living room 3). The control unit 50 can control the operation of the local exhaust device 30 (the range hood 31 and the local exhaust fan 32) and the air supply device 40 based on the odor and CO2 concentration of the air in the living room 3 measured by the air quality sensor 20.

[0034] In the house 2 equipped with the ventilation system 1 configured in this way, the resident can operate the range hood 31 as necessary, for example, when cooking in the living / dining / kitchen area 3. At this time, depending on the air volume and operation time of the range hood 31, the balance between the amount of air supplied and the amount of air exhausted within the house 2 may be lost, causing excessive negative pressure inside the house 2. When the indoor pressure becomes excessively negative in summer, humid outside air is taken inside the house, and the outside air is cooled by the cooling operation of the air conditioner, creating a state in which condensation is likely to occur.

[0035] Therefore, in the ventilation system 1 according to this embodiment, the control unit 50 performs negative pressure removal control for removing the generation of excessive negative pressure indoors of the house 2.

[0036] The flow of the negative pressure eliminating control will be described below with reference to the flowchart of Fig. 3. The negative pressure eliminating control shown in Fig. 3 is constantly executed repeatedly in the summer.

[0037] In step S11, the control unit 50 acquires the effective opening area αA of the house 2 via the input unit 10. The "effective opening area αA" can be calculated from the air intake area (the opening area for the air intake of the air intake device 40, etc.) and the gap of the house 2 (C value).

[0038] After performing the process of step S11, the control unit 50 proceeds to step S12.

[0039] In step S12, the control unit 50 calculates and sets the upper airflow limit Q of the range hood 31. Here, the "upper airflow limit Q" is the upper airflow limit [m 2 / s]. The upper airflow limit Q is calculated using the following formula 1.

[0040] Q=αA√(2 / ρ0×Δp) (Formula 1)

[0041] "αA" in the above formula 1 is the effective opening area [m 2 ]. Also, "ρ0" is the air density [kg / m3 In this embodiment, the air density ρ0 is a fixed value (1.2 [kg / m 3 ]). Also, "Δp" refers to the target value (upper limit) [Pa] of the pressure difference between the outside air pressure and the indoor pressure (the pressure difference between the outside air and the indoor air of the house 2). The target pressure difference value Δp is set taking into consideration the ease of condensation in the room and the ease of opening and closing the door, and is set to 4.0 [Pa] in this embodiment.

[0042] After performing the process of step S12, the control unit 50 proceeds to step S13.

[0043] In step S13, the control unit 50 calculates and sets the limited operation time of the range hood 31, which has a relatively large air volume among the local exhaust ventilation devices 30. Here, the "limited operation time" refers to the limit value (longest operation time) [min] of the operation time of the range hood 31. The limited operation time is calculated by the following formula 2.

[0044] Limited operation time = {(air volume of the space to be ventilated × target ventilation rate) / upper air volume limit Q} × 60 (Formula 2)

[0045] The target ventilation rate in the formula 2 means a targeted ventilation rate [times / h]. The target ventilation rate is set to a rate that ensures a sufficient ventilation air volume (without excessive ventilation air volume), and is set to 5 times / h in this embodiment.

[0046] After performing the process of step S13, the control unit 50 proceeds to step S14.

[0047] In step S14, the control unit 50 determines whether the range hood 31 is in operation.

[0048] If the control unit 50 determines that the range hood 31 is in operation ("YES" in step S14), the process proceeds to step S15. On the other hand, if the control unit 50 determines that the range hood 31 is not in operation ("NO" in step S14), the process of step S14 is performed again. That is, the process does not proceed further until step S14 becomes YES.

[0049] In step S15, the control unit 50 starts the air volume control operation of the range hood 31. Specifically, the control unit 50 sets the air volume of the range hood 31 to an arbitrary value (for example, the upper air volume limit Q) equal to or less than the upper air volume limit Q, and operates the range hood 31. In this way, by limiting the air volume of the range hood 31 to or less than the upper air volume limit Q, it is possible to prevent the exhaust volume from becoming extremely large compared to the supply air volume.

[0050] After performing the process of step S15, the control unit 50 proceeds to step S16.

[0051] In step S16, the control unit 50 starts the operation of the air supply device 40. The air supply device 40 performs an air supply operation at a predetermined air volume.

[0052] After performing the process of step S16, the control unit 50 proceeds to step S17.

[0053] In step S17, if the local exhaust fan 32 is in operation, the control unit 50 stops the operation of the local exhaust fan 32.

[0054] In this way, during exhaust operation of the range hood 31, the air supply device 40 is operated (step S16) and the local exhaust fan 32 is stopped (step S17), thereby preventing the exhaust volume from becoming extremely large compared to the supply air volume.

[0055] After performing the process of step S17, the control unit 50 proceeds to step S18.

[0056] In step S18, the control unit 50 determines whether or not the operation time of the range hood 31 has reached the limited operation time set in step S13.

[0057] The method of determination in step S18 is not limited to the above-mentioned method, and the control unit 50 may perform the determination in step S18 based on the detection result by the air quality sensor 20. For example, the control unit 50 may determine that the operation time of the range hood 31 has reached the limited operation time when the odor or CO2 concentration of the air in the LDK 3 detected by the air quality sensor 20 falls below a predetermined threshold. On the other hand, the control unit 50 may determine that the operation time of the range hood 31 has not reached the limited operation time when the odor or CO2 concentration of the air in the LDK 3 detected by the air quality sensor 20 does not fall below a predetermined threshold. In other words, the limited operation time may be set to the time until the odor or CO2 concentration of the air in the LDK 3 detected by the air quality sensor 20 falls below a predetermined threshold.

[0058] If the control unit 50 determines that the operation time of the range hood 31 has not reached the limited operation time ("NO" in step S18), the process proceeds to step S19. On the other hand, if the control unit 50 determines that the operation time of the range hood 31 has reached the limited operation time ("YES" in step S18), the process proceeds to step S20.

[0059] In step S19, the control unit 50 causes the range hood 31 to continue operating.

[0060] After performing the process of step S19, the control unit 50 ends the flow of the negative pressure elimination control shown in FIG.

[0061] Meanwhile, in step S20, the control unit 50 stops the operation of the range hood 31. In this way, when the operation time of the range hood 31 reaches the limited operation time due to forgetting to turn off the range hood 31 or the like, stopping the operation of the range hood 31 can prevent the exhaust volume from becoming extremely large compared to the supply air volume.

[0062] After performing the process of step S20, the control unit 50 proceeds to step S21.

[0063] In step S21, the control unit 50 stops the operation of the air supply device 40.

[0064] After performing the process of step S21, the control unit 50 proceeds to step S22.

[0065] In step S22, the control unit 50 starts the operation of the local exhaust fan 32.

[0066] After performing the process of step S22, the control unit 50 ends the flow of the negative pressure elimination control shown in FIG.

[0067] As described above, in the ventilation system 1 according to the present embodiment, by limiting the air volume and operation time of the range hood 31, it is possible to prevent the exhaust volume from becoming extremely large compared to the supply volume, and thus to suppress excessive negative pressure in the room. In this way, by eliminating the excessive negative pressure in the room, the amount of humid outdoor air taken into the room is reduced. This makes it possible to suppress the occurrence of condensation due to cooling of the humid outdoor air.

[0068] Furthermore, the upper limit of the air volume of the range hood 31 (upper air volume Q) is set according to the effective opening area αA of the house 2 (step S12). For this reason, for example, if the effective opening area αA of one house 2 is different from the effective opening area αA of another house 2, the air volume of the range hood 31 during air volume control operation is also set to a different value. In this way, by setting the air volume of the range hood 31 to an appropriate value according to the effective opening area αA of the house 2, it is possible to prevent excessive negative pressure in the room while ensuring sufficient ventilation in each house 2.

[0069] 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), A range hood 31 (local exhaust device 30) capable of performing local exhaust of the house 2; A control unit 50 capable of controlling the range hood 31; Equipped with The control unit 50 An upper airflow limit Q of the range hood 31 is set based on a target pressure difference between the outside air pressure and the indoor pressure and an effective opening area αA of the house 2 (step S12). An air volume control operation (step S15) can be executed in which the air volume is controlled to be equal to or lower than the air volume upper limit value Q and the range hood 31 is operated.

[0070] This configuration can prevent the interior of the room from becoming excessively negative pressure. Specifically, by controlling the air volume of range hood 31 to be equal to or less than upper air volume limit Q, it is possible to prevent the exhaust volume from becoming excessive relative to the supply volume, and therefore to prevent the pressure in the room from becoming too negative. Furthermore, by setting the airflow upper limit value Q based on the effective opening area αA of the house 2, the airflow of the range hood 31 can be set to a value suited to the house 2.

[0071] In addition, the control unit 50 Set the limit operation time of the range hood 31 (step S13), When the operation time of the range hood 31 reaches the limited operation time (YES in step S18), the operation of the range hood 31 is stopped (step S20).

[0072] With this configuration, excessive negative pressure in the room can be prevented. Specifically, it is possible to prevent the range hood 31 from running for a long time due to forgetting to turn it off, and it is also possible to prevent the pressure in the room from becoming too negative.

[0073] In addition, the control unit 50 The restricted operation time is set based on the target ventilation frequency and the upper air volume limit value of the house 2 (step S13).

[0074] This configuration can prevent the room from becoming overly negative pressure while ensuring a sufficient amount of ventilation air.

[0075] The house 2 further includes an air quality sensor 20 capable of detecting at least one of the odor and the carbon dioxide concentration of the air in the room of the house 2. The control unit 50 The time until the odor of the indoor air or the carbon dioxide concentration falls below a predetermined threshold is set as the limited operation time (step S13).

[0076] With this configuration, it is possible to prevent excessive negative pressure in the room while removing odors from the air in the room or while suppressing an increase in the carbon dioxide concentration.

[0077] In addition, the ventilation system 1 according to this embodiment is The system is provided with an air supply device 40 for supplying air to the indoor space, The control unit 50 During the air volume control operation of the range hood 31, the operation of the air supply device 40 is started (step S16).

[0078] With this configuration, it is possible to prevent the exhaust volume from becoming excessive relative to the supply volume while the range hood 31 is in operation.

[0079] The local exhaust device 30 includes a range hood 31 and a local exhaust fan 32 other than the range hood, The control unit 50 The range hood 31 is set as a target of the air volume control operation, During the air volume control operation of the range hood 31, the operation of the local exhaust fan 32 is stopped (step S17).

[0080] With this configuration, it is possible to prevent the exhaust volume from becoming excessive relative to the supply volume while the range hood 31 is in operation.

[0081] The house 2 according to this embodiment is equipped with the ventilation system 1.

[0082] This configuration can prevent the interior of the room from becoming excessively negative pressure.

[0083] 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.

[0084] 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.

[0085] In addition, in this embodiment, the air volume and operation time of the range hood 31 of the local exhaust devices 30 are controlled, but the air volume and operation time of other local exhaust devices 30 (for example, the local exhaust fan 32) may be controlled, or the air volume and operation time of all the local exhaust devices 30 may be controlled. Furthermore, when the local exhaust device 30 includes local exhaust devices other than the range hood 31 and the local exhaust fan 32 (i.e., three or more local exhaust devices), the air volume and operation time of some of the two or more local exhaust devices 30 may be controlled.

[0086] Furthermore, in the case where the local exhaust device 30 includes other local exhaust devices in addition to the range hood 31 and the local exhaust fan 32, it is preferable that the operation of the other local exhaust devices is also stopped in step S17. [Explanation of symbols]

[0087] 1. Ventilation system 2. Housing 20 Air Quality Sensor 30 Local exhaust ventilation system 31 Range Hood 32 Local exhaust fan 40 Air supply system 50 Control section

Claims

1. A ventilation system for ventilating a building, comprising: A local exhaust system capable of performing local exhaust of the building; A control unit capable of controlling the local exhaust device; Equipped with The control unit is setting an upper airflow limit value of the local exhaust ventilation device based on a target value of the pressure difference between the outside air pressure and the indoor pressure and an effective opening area of ​​the building; An air volume control operation can be performed to operate the local exhaust device by controlling the air volume to be equal to or lower than the air volume upper limit value. Ventilation system.

2. The control unit is Setting a limited operation time of the local exhaust ventilation system, When the operation time of the local exhaust ventilation system reaches the limited operation time, the operation of the local exhaust ventilation system is stopped.

2. The ventilation system of claim 1.

3. The control unit is setting the restricted operation time based on the target ventilation rate and the upper airflow limit value of the building; 3. The ventilation system of claim 2.

4. An air quality sensor capable of detecting at least one of an odor or a carbon dioxide concentration of air in the room of the building is provided, The control unit is The time until the odor of the indoor air or the carbon dioxide concentration falls below a predetermined threshold is set as the limited operation time.

3. The ventilation system of claim 2.

5. Equipped with an air supply device that supplies air indoors, The control unit is starting operation of the air supply device while the air volume control operation of the local exhaust system is being performed; 2. The ventilation system of claim 1.

6. The local exhaust device includes a range hood and a local exhaust fan other than the range hood, The control unit is The range hood is the target of the airflow control operation, stopping the operation of the local exhaust fan while the air volume control operation of the range hood is being performed; 2. The ventilation system of claim 1.

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

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