Ventilation system

Abstract

To provide a ventilation system that can improve heat exchange efficiency while maintaining the functionality of normal ventilation. [Solution] The ventilation system 100 includes a first ventilation device 1 having an air supply passage 110, an exhaust passage 120, an outdoor temperature sensor 15, an indoor temperature sensor 8, an air supply fan 10, a first exhaust fan 9, and a heat exchange element 30 that exchanges heat between the air in the air supply passage 110 and the air in the exhaust passage 120; a second ventilation device 2 having a second exhaust fan 11; and a control unit 20 that controls the operation of the first ventilation device 1 and the second ventilation device 2. Based on the operating status of the second ventilation device 2 and the detection results from the outdoor temperature sensor 15 and the indoor temperature sensor 8, the control unit 20 reduces the airflow of the first exhaust fan 9 and increases the airflow of the second exhaust fan 11.

Description

[Technical Field]

[0001] The present invention relates to a ventilation system. [Background Art]

[0002] In recent years, with the increasing awareness of energy conservation, heat exchange ventilation devices that perform ventilation while exchanging heat between indoor air and outdoor air have become widely popular (for example, Patent Document 1). [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2023-64783 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] A conventional heat exchange ventilation device as disclosed in Patent Document 1 includes a bypass air passage for performing ventilation without passing through a heat exchange element (normal ventilation) during periods where heat exchange ventilation is unnecessary, such as intermediate seasons. Such a bypass air passage is generally formed inside the heat exchange ventilation device, as shown in Patent Document 1. However, forming the bypass air passage inside the heat exchange ventilation device increases the size of the heat exchange ventilation device. Since heat exchange ventilation devices are installed in narrow spaces such as the space above a ceiling, a reduction in size is desired.

[0005] Furthermore, heat exchange efficiency, which is the main performance of a heat exchange ventilation device, is correlated with the size of the heat exchange element. Therefore, when comparing heat exchange ventilation devices of the same overall size, a heat exchange ventilation device provided with a bypass air passage requires a smaller heat exchange element than a heat exchange ventilation device without a bypass air passage. In other words, the heat exchange efficiency becomes lower.

[0006] As described above, with conventional technology, it has been difficult to improve heat exchange efficiency by increasing the size of the heat exchange element while maintaining the function of normal ventilation using a bypass airflow path.

[0007] The present invention aims to solve the above-mentioned conventional problems and to provide a ventilation system that can improve heat exchange efficiency while maintaining the function of normal ventilation. [Means for solving the problem]

[0008] To achieve this objective, the ventilation system according to the present invention comprises: an air supply passage that guides outdoor air into the building; an exhaust passage that guides indoor air to the outside; an outdoor temperature sensor that detects the outdoor temperature; an indoor temperature sensor that detects the indoor temperature; a first ventilation device having an air supply fan, a first exhaust fan, and a heat exchange element that exchanges heat between the air in the air supply passage and the air in the exhaust passage; a second ventilation device having a second exhaust fan; and a control unit that controls the operation of the first ventilation device and the second ventilation device. Based on the operating status of the second ventilation device and the detection results from the outdoor temperature sensor and the indoor temperature sensor, the control unit reduces the airflow rate of the first exhaust fan and increases the airflow rate of the second exhaust fan. This achieves the intended objective. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a ventilation system that can improve heat exchange efficiency while maintaining the function of normal ventilation. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic diagram showing the overall configuration of the ventilation system in Embodiment 1. [Figure 2] Figure 2 is a block diagram showing the configuration of the control unit and its surroundings in Embodiment 1. [Figure 3] Figure 3 is a flowchart showing the flow of the normal ventilation determination process in Embodiment 1. [Figure 4] Figure 4 is a schematic diagram showing the overall configuration of the ventilation system in Embodiment 2. [Figure 5] Figure 5 is a schematic diagram showing the overall configuration of the ventilation system in Embodiment 3. [Figure 6] Figure 6 is a schematic diagram showing the overall configuration of the ventilation system in Embodiment 4. [Figure 7] Figure 7 is a schematic diagram showing the overall configuration of the ventilation system in Embodiment 5. [Figure 8] Figure 8 is a flowchart showing the flow of the normal ventilation determination process in a modified example. [Modes for carrying out the invention]

[0011] The embodiments for carrying out the present invention will be described below with reference to the attached drawings. The embodiments described below are all preferred specific examples of the present invention. Therefore, the numerical values, shapes, materials, and components shown in the following embodiments, as well as the arrangement and connection configurations of the components, are examples only and are not intended to limit the present invention. Accordingly, among the components in the following embodiments, those not described in the independent claim representing the highest-level concept of the present invention will be described as optional components. Furthermore, in each figure, substantially identical components are denoted by the same reference numerals, and redundant explanations are omitted or simplified.

[0012] (Embodiment 1) First, the overall configuration of the ventilation system 100 will be described with reference to Figure 1. Figure 1 is a schematic diagram showing the overall configuration of the ventilation system 100 in Embodiment 1.

[0013] The ventilation system 100 is installed in a building and is a system that exchanges indoor air with outdoor air. The ventilation system 100 comprises exhaust air passages 120a, 120b, and 120c, collectively referred to as the exhaust air passage 120, a supply air passage 110, a first ventilation device 1, a second ventilation device 2, a remote control 7, and a control unit 20. "Indoors" refers to spaces where people are present on a daily basis, such as living rooms, bedrooms, corridors, or kitchens.

[0014] The exhaust air passage 120 is an air passage that guides indoor air (including bathrooms, toilets, etc.) to the outside. The exhaust air passage 120 comprises exhaust air passage 120a, exhaust air passage 120b, and exhaust air passage 120c.

[0015] The exhaust air passage 120a is an air passage that guides indoor air to the second ventilation device 2. More specifically, the exhaust air passage 120a is an air passage that guides indoor air through duct 121, the first ventilation device 1, and duct 122 in that order, to the second ventilation device 2.

[0016] The exhaust air passage 120b is an air passage that guides bathroom air to the second ventilation device 2. More specifically, the exhaust air passage 120b is an air passage that guides bathroom air to the second ventilation device 2 via the duct 151.

[0017] The exhaust air passage 120c is an air passage that guides the air blown out by the second ventilation device 2 to the outside. More specifically, the exhaust air passage 120c is an air passage that guides the air blown out by the second ventilation device 2 to the outside via the duct 123. In other words, the exhaust air passage 120c exhausts to the outside a mixture of the air that has flowed through the exhaust air passage 120a and the air that has flowed through the exhaust air passage 120b.

[0018] The air supply passage 110 is an air passage that guides outdoor air into the building. More specifically, the air supply passage 110 circulates outdoor air in the following order: duct 111, first ventilation device 1, and duct 112. This is an air duct that directs air indoors.

[0019] The first ventilation system 1 is a ventilation system that exchanges indoor air with outdoor air while exchanging heat, and is a so-called heat exchange type ventilation system. The first ventilation system 1 is installed in the attic or under the floor. The first ventilation system 1 is connected to the interior of the building via duct 121. The first ventilation system 1 is also connected to the interior of the building via duct 112. Furthermore, the first ventilation system 1 is connected to the exterior of the building via duct 111. In addition, the first ventilation system 1 is connected to the second ventilation system 2 via duct 122.

[0020] The duct 121 forms part of the exhaust air passage 120 and is a component that draws in indoor air and guides it to the first ventilation device 1.

[0021] Duct 112 forms part of the air supply passage 110 and is a component that guides the air blown out by the first ventilation device 1 into the interior of the building. More specifically, duct 112 guides the outdoor air that the first ventilation device 1 has drawn in through duct 111 into the interior of the building.

[0022] The duct 111 forms part of the air supply passage 110 and is a component that guides outdoor air to the first ventilation device 1.

[0023] Duct 122 forms part of the exhaust air passage 120 and is a component that guides the air blown out by the first ventilation device 1 to the second ventilation device 2. More specifically, duct 122 guides the indoor air that the first ventilation device 1 has drawn in through duct 121 to the second ventilation device 2.

[0024] The first ventilation system 1 more specifically comprises a first exhaust fan 9, a supply fan 10, a heat exchange element 30, an outdoor temperature sensor 15, and a damper 12.

[0025] The first exhaust fan 9 is a fan that generates an exhaust flow (dashed arrow in Figure 1) from indoors to outdoors. The first exhaust fan 9 is installed between the heat exchange element 30 and the duct 122. In other words, the first exhaust fan 9 is installed downstream of the heat exchange element 30 in the exhaust air passage 120. The first exhaust fan 9 is also communicated with the control unit 20. In other words, the control unit 20 controls the operation of the first exhaust fan 9. In other words, the airflow of the first exhaust fan 9 is controlled by the control unit 20.

[0026] The supply air blower 10 is a blower that generates an airflow (solid arrow in Figure 1) from outdoors to indoors. The supply air blower 10 is installed between the heat exchange element 30 and the duct 112. In other words, the supply air blower 10 is installed downstream of the heat exchange element 30 in the supply air passage 110. The supply air blower 10 is also communicated with the control unit 20. In other words, the control unit 20 controls the operation of the supply air blower 10. In other words, the airflow rate of the supply air blower 10 is controlled by the control unit 20.

[0027] The heat exchange element 30 is a component that exchanges heat between air moving from indoors to outdoors and air moving from outdoors to indoors. The heat exchange element 30 exchanges heat between the supply airflow circulating in the supply air passage 110 and the exhaust airflow circulating in the exhaust air passage 120. Known technologies can be used for the heat exchange element 30.

[0028] The outdoor temperature sensor 15 is a sensor that detects the temperature of the outdoor air. The outdoor temperature sensor 15 is installed between the heat exchange element 30 and the duct 111. In other words, the outdoor temperature sensor 15 is installed upstream of the heat exchange element 30 in the air supply passage 110. The outdoor temperature sensor 15 only needs to be able to detect the temperature of the outdoor air. Specifically, the outdoor temperature sensor 15 may be installed inside the duct 111 or outdoors.

[0029] The damper 12 adjusts the amount of air flowing through the exhaust air passage 120 inside the first ventilation device 1. The damper 12 prevents air from flowing into the first ventilation device 1 during normal ventilation operation. In other words, the damper 12 prevents air from being blown out of the first ventilation device 1 during normal ventilation operation. To put it another way, the damper 12 prevents airflow from being generated in the exhaust air passage 120a during normal ventilation operation.

[0030] Furthermore, the damper 12 ensures that air flows into the first ventilation system 1 during heat exchange operation. In other words, the damper 12 ensures that air is blown out of the first ventilation system 1 during heat exchange operation. To put it another way, it ensures that airflow is generated in the exhaust air passage 120a during heat exchange operation.

[0031] In this embodiment, the damper 12 is installed at the connection point between the first ventilation device 1 and the duct 121. The damper 12 may be installed anywhere as long as it can adjust the amount of air flowing through the exhaust air passage 120 within the first ventilation device 1. Specifically, the damper 12 may be installed in the exhaust air passage 120 upstream of the second ventilation device 2 or the second ventilation device 2. More specifically, the damper 12 may be installed inside the second ventilation device 2, inside the duct 121, inside the duct 122, at the connection point between the duct 122 and the first ventilation device 1, or at the connection point between the duct 122 and the second ventilation device 2.

[0032] The second ventilation device 2 is a ventilation device that exhausts bathroom air to the outside. The second ventilation device 2 is installed in the space above the ceiling of the bathroom. In this embodiment, the second ventilation device 2 is connected to the bathroom via a bathroom intake port 150 and a duct 151. Furthermore, the second ventilation device 2 is connected to the first ventilation device 1 via a duct 122. In addition, the second ventilation device 2 is connected to the outside via a duct 123. The second ventilation device 2 also includes a second exhaust fan 11.

[0033] The bathroom intake vent 150 is an opening that draws in air from the bathroom and is installed, for example, in the ceiling of the bathroom. The bathroom intake vent 150 may also be installed in the second ventilation system 2. In other words, the bathroom intake vent 150 may serve as both the opening for the second ventilation system 2 and the opening in the ceiling. In this case, the installation of the duct 151 becomes unnecessary.

[0034] The duct 151 is a component that guides the bathroom air drawn in by the bathroom intake 150 to the second ventilation device 2.

[0035] As described above, duct 122 is a component that guides the air blown out by the first ventilation device 1 to the second ventilation device 2.

[0036] The duct 123 forms part of the exhaust air passage 120 and is a component that exhausts the air blown out by the second ventilation device 2 to the outside via the outdoor outlet 74.

[0037] The outdoor air outlet 74 is an opening that blows the air flowing through the duct 123 to the outside. The outdoor air outlet 74 is installed on the exterior wall of the building.

[0038] The second exhaust fan 11 is a fan that generates airflow from the bathroom to the outside. The second exhaust fan 11 is also a fan that generates airflow from the inside to the outside. The second exhaust fan 11 is installed between duct 122 and duct 123. In other words, the second exhaust fan 11 is installed downstream of the heat exchange element 30 in the exhaust air passage 120. To put it another way, the second exhaust fan 11 is installed inside the second ventilation device 2. Furthermore, the second exhaust fan 11 is communicatively connected to the control unit 20. In other words, the control unit The control unit 20 controls the operation of the second exhaust fan 11. More specifically, the airflow of the second exhaust fan 11 is controlled by the control unit 20.

[0039] The remote control 7 is a controller for the user to set the desired airflow for the first ventilation device 1 and the second ventilation device 2. The remote control 7 is installed, for example, on an indoor wall. The remote control 7 is communicatively connected to the control unit 20. More specifically, the remote control 7 sets the operating status of the first ventilation device 1 and the second ventilation device 2 via the control unit 20. In this embodiment, the remote control 7 includes an indoor temperature sensor 8.

[0040] The indoor temperature sensor 8 is a sensor that detects the temperature of the indoor air. In this embodiment, the indoor temperature sensor 8 is installed on the remote control 7, but is not limited to this. The indoor temperature sensor 8 may be installed anywhere as long as it can detect the indoor temperature. Specifically, the indoor temperature sensor 8 may be installed inside the duct 121, or between the heat exchange element 30 and the duct 121, etc.

[0041] The control unit 20 controls the operating status of the first ventilation system 1 and the second ventilation system 2. Specifically, the control unit 20 controls the operation of the first exhaust fan 9, the supply fan 10, and the second exhaust fan 11. More specifically, the control unit 20 controls the airflow rates of the first exhaust fan 9, the supply fan 10, and the second exhaust fan 11. Even more specifically, based on the operating status of the second ventilation system 2 and the detection results from the outdoor temperature sensor 15 and the indoor temperature sensor 8, the control unit 20 decreases the airflow rate of the first exhaust fan 9 and increases the airflow rate of the second exhaust fan 11. In other words, the control unit 20 controls the switching between heat exchange ventilation operation and normal ventilation operation.

[0042] Heat exchange ventilation operation is an operating mode in which supply airflow and exhaust airflow are circulated to the heat exchange element 30. Specifically, the supply airflow is supplied from outdoors to the indoors via duct 111, the first ventilation device 1, and duct 112. The exhaust airflow from indoors is led from indoors to the second ventilation device 2 via duct 121, the first ventilation device 1, and duct 122, where it merges with the exhaust airflow from the bathroom and is then exhausted outdoors via duct 123. The exhaust airflow from the bathroom is also led to the second ventilation device 2 via duct 151, where it merges with the exhaust airflow from indoors and is then exhausted outdoors via duct 123. In heat exchange ventilation operation, the damper 12 is open. In other words, in heat exchange ventilation operation, the damper 12 connects the inside of the first ventilation device 1 with the inside of the second ventilation device 2. To put it another way, the damper 12 allows airflow from the first ventilation device 1 to the second ventilation device 2 to pass through.

[0043] During heat exchange ventilation operation, the air in exhaust air passage 120a merges with the air in exhaust air passage 120b and is then exhausted outdoors via exhaust air passage 120c.

[0044] Furthermore, the airflow rate of the supply air blower 10 during heat exchange ventilation operation is A1[m³ 3 [h], the airflow of the first exhaust blower 9 is B1[m 3 If we set it to [ / h], it is preferable that A1 and B1 have roughly the same airflow. Specifically, for example, A1 and B1 should be "105m 3 For example, " / h". Furthermore, the airflow rate of the second exhaust fan 11 during heat exchange operation is, for example, "0m 3 It is " / h".

[0045] Normal ventilation operation is an operating mode in which exhaust airflow is not allowed to flow through the heat exchange element 30. In other words, the supply airflow is supplied indoors from outdoors via duct 111, the first ventilation device 1, and duct 112. Also, the exhaust airflow from indoors does not flow inside the first ventilation device 1 due to the damper 12. In other words, the exhaust airflow from indoors is not exhausted to the second ventilation device 2 or outdoors. On the other hand, the exhaust airflow from the bathroom is exhausted via duct 151, the second ventilation device 2, and duct 12. The exhaust is directed outdoors via 3.

[0046] During normal ventilation operation, the air in exhaust duct 120b is exhausted outdoors via exhaust duct 120c without mixing with the air in exhaust duct 120a. Furthermore, the airflow rate of the first exhaust fan 9 during normal ventilation operation is set lower than that of the first exhaust fan 9 during heat exchange ventilation operation. Specifically, the airflow rate of the first exhaust fan 9 during normal ventilation operation is set to, for example, "0 m 3 It is set to " / h". Also, during normal ventilation operation, the airflow rate of the second exhaust fan 11 is C1[m 3 It is set to [ / h]. In other words, when switching from heat exchange ventilation operation to normal ventilation operation, the airflow of the first exhaust fan 9 decreases and the airflow of the second exhaust fan 11 increases. For example, the airflow of the supply air fan 10 is set to [105m / h]. 3 Maintaining " / h", the airflow of the first exhaust blower 9 is "105m3 / h" to "0 m 3 / h", and the air volume of the second exhaust blower 11 changes from "0 m 3 / h" to "105 m 3 / h".

[0047] Next, the configuration of the control unit 20 will be described with reference to FIG. 1 and FIG. 2. FIG. 2 is a block diagram showing the configuration of the control unit 20 and the periphery of the control unit 20 in Embodiment 1.

[0048] The control unit 20 determines whether heat exchange using the heat exchange element 30 is effective based on the temperature of outdoor air (outdoor temperature To) and the temperature of indoor air (indoor temperature Ti), and instructs the first ventilation device 1 and the second ventilation device 2 to perform normal ventilation operation when the heat exchange is not effective.

[0049] Specifically, the control unit 20 causes the first exhaust blower 9 to reduce or stop its air volume and increases the air volume of the second exhaust blower 11 based on the operating status of the second ventilation device 2 and the detection results of the outdoor temperature sensor 15 and the indoor temperature sensor 8.

[0050] More specifically, when the second exhaust blower 11 is not in operation, the control unit 20 reduces the air volume of the first exhaust blower 9 and starts the operation of the second exhaust blower 11 based on the detection results of the outdoor temperature sensor 15 and the indoor temperature sensor 8.

[0051] More specifically, when the second exhaust fan 11 is operating, the control unit 20 ensures that the airflow of the second exhaust fan 11 is less than or equal to the airflow of the supply fan 10. When the second exhaust fan 11 is not operating, the control unit 20 acquires the detection results from the outdoor temperature sensor 15 and the indoor temperature sensor 8 and determines whether the outdoor temperature To is above a predetermined temperature and whether the indoor temperature Ti is above or equal to the outdoor temperature To. Furthermore, if the outdoor temperature To is above a predetermined temperature and the indoor temperature Ti is above or equal to the outdoor temperature To, the control unit 20 starts operating the second exhaust fan 11 and ensures that the airflow of the second exhaust fan 11 is less than or equal to the airflow of the supply fan 10. On the other hand, if the outdoor temperature To is above a predetermined temperature and the indoor temperature Ti is not above or equal to the outdoor temperature To, the control unit 20 maintains the airflow of the first exhaust fan 9 and the supply fan 10.

[0052] More specifically, when the second exhaust fan 11 is operating, the control unit 20 ensures that the airflow of the second exhaust fan 11 is less than or equal to the airflow of the supply fan 10, and uses the damper 12 to close the exhaust air passage 120 inside the first ventilation device 1. When the second exhaust fan 11 is not operating, the control unit 20 acquires the detection results from the outdoor temperature sensor 15 and the indoor temperature sensor 8, and determines whether the outdoor temperature To is above a predetermined temperature and whether the indoor temperature Ti is above or equal to the outdoor temperature To. If the result is that the outdoor temperature To is above a predetermined temperature and the indoor temperature Ti is above or equal to the outdoor temperature To, the control unit 20 starts operating the second exhaust fan 11, ensures that the airflow of the second exhaust fan 11 is less than or equal to the airflow of the supply fan 10, and uses the damper 12 to close the exhaust air passage 120 inside the first ventilation device 1. On the other hand, if the outdoor temperature To is above a predetermined temperature and the indoor temperature Ti is not above or equal to the outdoor temperature To, the control unit 20 maintains the airflow of the first exhaust fan 9 and the supply fan 10.

[0053] The control unit 20 includes an operating state acquisition unit 21, a temperature acquisition unit 22, an operation determination unit 23, and an operation instruction unit 24.

[0054] The operating status acquisition unit 21 determines the operating status of the second ventilation device 2. More specifically, the operating status acquisition unit 21 acquires whether or not the second ventilation device 2 is operating. In other words, the operating status acquisition unit 21 acquires information on whether or not air is being supplied by the second exhaust fan 11, and inputs the result to the temperature acquisition unit 22.

[0055] The temperature acquisition unit 22 acquires the temperatures detected by the outdoor temperature sensor 15 and the indoor temperature sensor 8. In other words, the temperature acquisition unit 22 acquires the outdoor temperature To and the indoor temperature Ti. More specifically, the temperature acquisition unit 22 acquires the outdoor temperature To and the indoor temperature Ti when the second exhaust fan 11 is not operating, as determined by the operating status acquisition unit 21. In addition, the temperature acquisition unit 22 acquires the outdoor temperature To and the indoor temperature Ti during normal ventilation operation. More precisely, the temperature acquisition unit 22 acquires the outdoor temperature To and the indoor temperature Ti in order to determine the timing to end normal ventilation operation.

[0056] The operation determination unit 23 determines whether or not to perform normal ventilation operation based on the detection results of the outdoor temperature sensor 15 and the indoor temperature sensor 8. Specifically, the operation determination unit 23 determines whether or not to perform normal ventilation operation through two types of processing.

[0057] First, the operation determination unit 23 determines whether the current season is an intermediate season or not. Specifically, the operation determination unit 23 determines whether the current season is an intermediate season or not based on the detection result (outdoor temperature To) of the outdoor temperature sensor 15. More specifically, the operation determination unit 23 determines whether the outdoor temperature To is above a predetermined temperature. An "intermediate season" refers to a period of transition between seasons, such as from spring to summer or from summer to autumn, for example, May, June, or September. A "predetermined temperature" is the temperature of the outdoor air during an intermediate season, for example, 15°C.

[0058] Furthermore, if the outdoor temperature To is above a predetermined temperature, the operation determination unit 23 determines whether the indoor temperature Ti is equal to or greater than the outdoor temperature To. More specifically, if the indoor temperature Ti is equal to or greater than the outdoor temperature To, the operation determination unit 23 determines that normal ventilation operation is necessary. In other words, during the transitional season, if the outdoor temperature To is lower than the indoor temperature Ti, the control unit 20 determines that normal ventilation operation is necessary because directly taking in outdoor air without heat exchange can cool the indoor air Ti more efficiently.

[0059] On the other hand, the operation determination unit 23 determines that normal ventilation operation is unnecessary if the indoor temperature Ti is not equal to or greater than the outdoor temperature To. In other words, the operation determination unit 23 determines that normal ventilation operation is unnecessary if the indoor temperature Ti is less than the outdoor temperature To.

[0060] Based on the above configuration, the operation determination unit 23 determines whether or not normal ventilation operation is necessary.

[0061] In addition, while normal ventilation is in operation, the operation determination unit 23 determines whether the outdoor temperature To is equal to or greater than the indoor temperature Ti in order to determine when to terminate the normal ventilation. More specifically, the operation determination unit 23 determines to terminate the normal ventilation operation if the outdoor temperature To is equal to or greater than the indoor temperature Ti. On the other hand, the operation determination unit 23 determines not to terminate the normal ventilation operation if the outdoor temperature To is not equal to or greater than the indoor temperature Ti. In other words, the operation determination unit 23 determines not to terminate the normal ventilation operation if the outdoor temperature To is less than the indoor temperature Ti.

[0062] The operation instruction unit 24, based on the output results of the operation status acquisition unit 21 and the operation determination unit 23, The operation instruction unit 24 instructs the first ventilation system 1 and the second ventilation system 2 to operate. More specifically, the operation instruction unit 24 instructs the first exhaust fan 9, the supply fan 10, and the second exhaust fan 11 to operate.

[0063] The operation instruction unit 24 instructs each ventilation device to perform normal ventilation operation when the second exhaust fan 11 is operating. Specifically, when the second exhaust fan 11 is operating, the operation instruction unit 24 instructs the exhaust air volume from the first exhaust fan 9 to be B2 [m³ 3 / h], the amount of air supplied by the supply air blower 10 is A1[m³ 3 Set the setting so that the exhaust air volume from the second exhaust fan 11 is C1[m 3 Set it so that it becomes [ / h]. Here, the relationship between A1, B2, and C1 is preferably set so that A1 ≥ (B2 + C1) in order to suppress negative pressure indoors. Specifically, A1 is set to "105m 3 / h", B2 is "0m 3 / h", C1 is "105m 3 This includes " / h" and so on. Note that B2 is not necessarily "0m 3 It is not necessary to set it to " / h", but during normal ventilation operation, the damper 12 blocks the exhaust air passage 120 in the first ventilation device 1, so almost no air can circulate. For this reason, B2 is set to "0m 3 It is preferable to use " / h".

[0064] Furthermore, if the second exhaust fan 11 is not operating and the operation determination unit 23 determines that normal ventilation operation is necessary, the operation instruction unit 24 instructs each ventilation device to perform normal ventilation operation. Specifically, if the second exhaust fan 11 is not operating and the operation determination unit 23 determines that normal ventilation operation is necessary, the operation instruction unit 24 starts the operation of the second exhaust fan 11, and the exhaust air volume from the first exhaust fan 9 is set to B2 [m³ 3 / h], the amount of air supplied by the supply air blower 10 is A1[m³ 3 / h], the exhaust air volume from the second exhaust blower 11 is C1[m 3 Set it to / h]

[0065] Furthermore, if the second exhaust fan 11 is not operating and the operation determination unit 23 determines that normal ventilation operation is unnecessary, the operation instruction unit 24 instructs the first ventilation device 1 and the second ventilation device 2 to perform heat exchange ventilation operation. Specifically, if the second exhaust fan 11 is not operating and the operation determination unit 23 determines that normal ventilation operation is unnecessary, the operation instruction unit 24 instructs the exhaust air volume from the first exhaust fan 9 to be B1 [m³ 3 / h], the amount of air supplied by the supply air blower 10 is A1[m³ 3 Set it so that it becomes [ / h]. Here, the relationship between A1 and B1 is preferably set so that A1 ≥ B1 in order to suppress negative pressure indoors. Specifically, A1 is set to [105m 3 / h", B1 is "105m 3 Examples include " / h".

[0066] The above describes the configuration of the ventilation system 100 according to Embodiment 1.

[0067] Next, the operation of the ventilation system 100 will be described with reference to Figures 1, 2, and 3. Figure 3 is a flowchart showing the flow of the normal ventilation determination process S100 in Embodiment 1.

[0068] First, the normal ventilation determination process S100 is performed while the ventilation system 100 is in operation. Based on the operating state of the second ventilation device 2, the indoor temperature Ti, and the outdoor temperature To, the normal ventilation determination process S100 reduces the exhaust air volume from the first ventilation device 1 (first exhaust fan 9) and increases the exhaust air volume from the second ventilation device 2 (second exhaust fan 11). In other words, normal ventilation can be performed without forming a bypass air passage inside the heat exchange ventilation device (first ventilation device 1). This makes it possible to increase the size of the heat exchange element 30 while maintaining the function of normal ventilation, thereby improving the heat exchange efficiency.

[0069] As shown in Figure 3, when the normal ventilation determination process S100 is started, the operation instruction unit 24 sets the airflow rate of the first exhaust fan 9 to B1[m 3 Set the airflow rate of the supply air blower 10 to A1[m 3Set to / h] (S101). As mentioned above, as an example, A1 is "105m 3 / h is ", and B1 is "105m 3 This means that the control unit 20 sets the first ventilation device 1 (ventilation system 100) to heat exchange ventilation operation.

[0070] Next, the operation control unit 24 opens the damper 12 to "open," allowing the air blown out from the first ventilation device 1 to flow to the second ventilation device 2 (S102).

[0071] Next, the operating status acquisition unit 21 acquires information regarding the operating status of the second ventilation device 2 (second exhaust fan 11) (S103).

[0072] If the second exhaust fan 11 is not operating, that is, if the second exhaust fan 11 is OFF (Yes in S103), the temperature acquisition unit 22 acquires the outdoor temperature To detected by the outdoor temperature sensor 15 and the indoor temperature Ti detected by the indoor temperature sensor 8 (S104). In other words, the airflow from the second exhaust fan 11 is "0 m 3 If the value is " / h", the temperature acquisition unit 22 acquires the detection results from the outdoor temperature sensor 15 and the indoor temperature sensor 8. Here, as an example, let's assume that the outdoor temperature To is 18°C ​​and the indoor temperature Ti is 20°C.

[0073] Next, the operation determination unit 23 determines whether the outdoor temperature To is above a predetermined temperature and whether the indoor temperature Ti is above the outdoor temperature To (S105). Here, as an example, let's assume the predetermined temperature is 15°C. That is, the outdoor temperature To (18°C) is above the predetermined temperature (15°C). Also, the indoor temperature Ti (20°C) is above the outdoor temperature To (18°C). That is, the outdoor temperature To is above the predetermined temperature and the indoor temperature Ti is above the outdoor temperature To.

[0074] In this case (Yes in S105), the operation instruction unit 24 indicates that the exhaust air volume from the first exhaust fan 9 is B2 [m³ 3 / h], the amount of air supplied by the supply air blower 10 is A1[m³ 3Set it so that it becomes / h] (S106). Here, as an example, A1 is "105m 3 / h", B2 is "0m 3 Let's assume it's " / h".

[0075] Next, the operation instruction unit 24 starts the operation of the second exhaust fan 11, and the exhaust air volume from the second exhaust fan 11 is set to C1[m³ 3 Set it so that it becomes / h] (S107). Here, as an example, C1 is "105m 3 Let's assume the airflow from the first exhaust fan 9 is "105 m³ / h". 3 / h" to "0m 3 The airflow from the second exhaust blower 11 is reduced to "0m / h", and the airflow from the second exhaust blower 11 is reduced to "0m 3 From " / h" to "105m 3 Increase it to " / h". As mentioned above, the relationship between A1, B2, and C1 is preferably set so that A1 ≥ (B2 + C1) in order to suppress negative pressure indoors.

[0076] Next, the operation instruction unit 24 uses the damper 12 to prevent the air blown out from the first ventilation device 1 from flowing into the second ventilation device 2 (S108). In other words, the damper 12 is closed, blocking the exhaust air passage 120a.

[0077] Next, the temperature acquisition unit 22 acquires the outdoor temperature To and the indoor temperature Ti, and the operation determination unit 23 determines whether the outdoor temperature To is equal to or greater than the indoor temperature Ti (S109). If the outdoor temperature To is not equal to or greater than the indoor temperature Ti (No. in S109), the operation instruction unit 24 instructs the first ventilation device 1 and the second ventilation device 2 to continue normal ventilation operation. In other words, the temperature acquisition unit 22 and the operation determination unit 23 repeat the acquisition and comparison of each temperature until the outdoor temperature To becomes equal to or greater than the indoor temperature Ti.

[0078] Next, after a certain period of time has elapsed, the outdoor temperature To remains at 18°C, and the indoor temperature Ti has decreased to 16°C due to the effect of the air conditioner, etc. In other words, if the outdoor temperature To (18°C) becomes higher than or equal to the indoor temperature Ti (16°C) (Yes in S109), the operation instruction unit 24 stops the operation of the second exhaust fan 11 (S110). In other words, the operation instruction unit 24 stops the operation of the second exhaust fan The airflow of machine 11 is set to "0 m 3 Set it to " / h".

[0079] Next, returning to S101, the operation instruction unit 24 sets the airflow rate of the first exhaust fan 9 to B1[m 3 Set the airflow rate of the supply air blower 10 to A1[m 3 Set to / h (S101). In other words, the operation instruction unit 24 switches the first ventilation device 1 (ventilation system 100) to heat exchange ventilation operation.

[0080] From this point onward, the same process is repeated, for example, until the power to the ventilation system 100 is turned off.

[0081] Next, let's explain the branching in S103. When the second exhaust fan 11 is operating, that is, when the second exhaust fan 11 is not OFF (No. in S103), the operation indicator 24 sets the exhaust air volume from the first exhaust fan 9 to B2 [m³ 3 / h], the amount of air supplied by the supply air blower 10 is A1[m³ 3 Set it so that it becomes / h] (S111). For example, A1 is "105m 3 / h", B2 is "0m 3 Let's assume it's " / h".

[0082] Next, the operation instruction unit 24 sets the exhaust air volume from the second exhaust fan 11 to C1[m³ 3 Set it so that it becomes / h] (S112). Here, as an example, C1 is "105m 3 Let's assume it's " / h".

[0083] Next, the operation instruction unit 24 closes the damper 12, preventing air blown out from the first ventilation device 1 from flowing to the second ventilation device 2 (S113). In other words, the damper 12 is closed, blocking the exhaust air passage 120a. In other words, the control unit 20 switches the first ventilation device 1 and the second ventilation device 2 (ventilation system 100) to normal ventilation operation.

[0084] Next, returning to S103, the operating status acquisition unit 21 acquires information regarding the operating status of the second exhaust fan 11 (second ventilation device 2) (S103). In other words, while the second exhaust fan 11 is operating, each ventilation device has an air supply volume of A1 [m³] from the supply air fan 10. 3 [h], the exhaust air volume from the first exhaust blower 9 is B2[m 3 / h], exhaust air volume C1[m 3 Drive so that it becomes / h].

[0085] Next, let's explain the branching in S105. If the outdoor temperature To is 15°C or higher, and the indoor temperature Ti is not equal to or higher than the outdoor temperature To (No. in S105), the process returns to S101, and the operation instruction unit 24 sets the airflow rate of the first exhaust fan 9 to B1[m 3 Set the airflow rate of the supply air blower 10 to A1[m 3 Set to / h (S101). In other words, the operation instruction unit 24 maintains the first ventilation device 1 (ventilation system 100) in heat exchange ventilation operation.

[0086] As described above, the ventilation system 100 reduces the exhaust airflow from the first ventilation device 1 and increases the exhaust airflow from the second ventilation device 2 based on the operating state of the second ventilation device 2, the indoor temperature Ti, and the outdoor temperature To. Therefore, normal ventilation operation can be performed without forming a bypass air passage inside the heat exchange ventilation device (first ventilation device 1). This allows the heat exchange element 30 to be enlarged while maintaining the function of normal ventilation, thereby improving heat exchange efficiency.

[0087] Furthermore, as mentioned above, the relationship between the airflow volumes from each fan is set so that A1 ≥ (B1 + C1). This prevents negative pressure from forming indoors, making it difficult to open doors and preventing dust from entering the building along with drafts. As a result, comfort can be maintained.

[0088] Furthermore, since the second ventilation system 2 mixes the air drawn in from the bathroom with the air blown out by the first ventilation system 1 and exhausts it outdoors, there is no need to install multiple outdoor outlets 74.

[0089] This configuration allows exhaust from two ventilation devices to be combined and exhausted into a single outlet. This means that it can be used in situations where the exterior walls of apartment buildings or other structures are narrow and multiple outdoor outlets 74 cannot be secured, thus increasing the flexibility of installation.

[0090] The above is a description of Embodiment 1. (Embodiment 2) Next, Embodiment 2 will be described with reference to Figure 4. Figure 4 is a schematic diagram showing the overall configuration of the ventilation system 100a in Embodiment 2. In the following description, components that are substantially the same as those in Embodiment 1 will be given the same reference numerals, and their descriptions will be simplified or omitted.

[0091] In Embodiment 1, an example was described in which the second ventilation device 2 is arranged in series with the first ventilation device 1 and downstream of the first ventilation device 1 in the exhaust air passage 120. On the other hand, in Embodiment 2, in order to further improve the degree of freedom of installation, an example is described in which the first ventilation device 1 and the second ventilation device 2 are installed in parallel, and the air blown out by each is mixed in the mixing section 70 before being exhausted.

[0092] The ventilation system 100a comprises exhaust air passages 120d, 120e, and 120f, collectively referred to as the exhaust air passage 120.

[0093] The exhaust air passage 120d is an air passage that guides indoor air to the mixing section 70. More specifically, the exhaust air passage 120d is an air passage that guides indoor air through the duct 121, the first ventilation device 1, and the duct 124 in that order to the mixing section 70.

[0094] The exhaust air passage 120e is an air passage that guides bathroom air to the mixing unit 70. More specifically, the exhaust air passage 120b is an air passage that guides bathroom air through duct 151, second ventilation device 2, and duct 125 in that order to the mixing unit 70.

[0095] The exhaust air passage 120f is an air passage that guides the air blown out from the mixing unit 70 to the outside. More specifically, the exhaust air passage 120f exhausts the air blown out from the mixing unit 70 to the outside via the duct 126. In addition, the air in the exhaust air passage 120f is a mixture of the air in the exhaust air passages 120d and 120e.

[0096] The ventilation system 100a comprises a mixing unit 70, a duct 124, a duct 126, a duct 125, and an outdoor outlet 75.

[0097] The mixing unit 70 is a component that draws in air blown out from the first ventilation device 1 and air blown out from the second ventilation device 2, mixes them, and exhausts them outdoors. The mixing unit 70 is connected to the first ventilation device 1 via duct 124. The mixing unit 70 is also connected to the second ventilation device 2 via duct 125. Furthermore, the mixing unit 70 is connected to the outdoors via duct 126.

[0098] The duct 124 forms part of the exhaust air passage 120 and is a component that guides the air blown out from the first ventilation device 1 to the mixing section 70.

[0099] The duct 126 forms part of the exhaust air passage 120 and is a component that exhausts the air blown out from the mixing section 70 to the outside.

[0100] Duct 125 forms part of the exhaust air passage 120 and air blown out from the second ventilation device 2 This component guides the air to the mixing section 70.

[0101] The outdoor air outlet 75 is an opening that blows the air flowing through the duct 126 to the outside. The outdoor air outlet 75 is installed on the exterior wall of the building.

[0102] As described above, Embodiment 2 includes a mixing unit 70 that mixes the air blown out by the first ventilation device 1 and the air blown out by the second ventilation device 2 and exhausts them to the outside.

[0103] This configuration improves the flexibility of placement between the first ventilation device 1 and the second ventilation device 2. More specifically, even if the second ventilation device 2 is not installed on the outdoor side of the first ventilation device 1, the exhaust from both ventilation devices can be combined and exhausted into a single outlet. In other words, it can accommodate situations where the exterior walls of apartment buildings and other structures are narrow and multiple outdoor outlets 75 cannot be secured, thus improving the flexibility of installation. (Embodiment 3) Next, Embodiment 3 will be described with reference to Figure 5. Figure 5 is a schematic diagram showing the overall configuration of the ventilation system 100b in Embodiment 3. In the following description, components that are substantially the same as those in Embodiment 1 will be given the same reference numerals, and their descriptions will be simplified or omitted.

[0104] In Embodiment 1, an example was described in which the second ventilation device 2 is positioned downstream of the first ventilation device 1 in the exhaust air passage 120. On the other hand, in Embodiment 2, in order to further improve the degree of freedom of installation, an example is described in which the first ventilation device 1 and the second ventilation device 2 are installed in parallel, and the air blown out by each is exhausted outdoors.

[0105] The ventilation system 100b comprises an exhaust air passage 120g and an exhaust air passage 120h, collectively referred to as the exhaust air passage 120.

[0106] The exhaust air passage 120g is an air passage that guides indoor air to the outdoors. More specifically, the exhaust air passage 120g is an air passage that guides indoor air to the outdoors by circulating it in the following order: duct 121, first ventilation device 1, duct 127.

[0107] The exhaust air passage 120h is an air passage that guides bathroom air to the outside. More specifically, the exhaust air passage 120h is an air passage that guides bathroom air to the outside by circulating it in the following order: duct 151, second ventilation device 2, and duct 128.

[0108] The ventilation system 100b includes a duct 127 and a duct 128.

[0109] Duct 127 forms part of the exhaust air passage 120 (exhaust air passage 120g) and is a component that guides the air blown out from the first ventilation device 1 to the outside. In other words, duct 127 does not guide the air blown out from the first ventilation device 1 to the second ventilation device 2. To put it another way, the air blown out from the first ventilation device 1 is exhausted to the outside without passing through the second ventilation device 2.

[0110] Duct 128 forms part of the exhaust air passage 120 (exhaust air passage 120h) and is a component that guides the air blown out from the second ventilation device 2 to the outside. In other words, duct 128 does not guide the air blown out from the first ventilation device 1. To put it another way, the air blown out from the second ventilation device 2 is exhausted to the outside without mixing with the air blown out from the first ventilation device 1.

[0111] As described above, in the ventilation system 100b of Embodiment 3, the air blown out by the first ventilation device 1 toward the outside is exhausted to the outside without passing through the second ventilation device 2.

[0112] This configuration allows the first ventilation device 1 and the second ventilation device 2 to be installed without being constrained by their relative positions. In other words, it improves the flexibility of the installation of the first ventilation device 1 and the second ventilation device 2.

[0113] Furthermore, the air blown out by the first ventilation device 1 and the air blown out by the second ventilation device 2 are guided outdoors without mixing. This reduces the risk of air drawn in from the bathroom flowing back into the first ventilation device 1. As a result, condensation on the heat exchange element 30 due to the high humidity air in the bathroom is suppressed. In other words, a decrease in heat exchange efficiency and an increase in pressure loss due to condensation are suppressed. Moreover, the inflow of high humidity air from the bathroom into the building is suppressed. In other words, the risk of compromising indoor comfort is reduced. (Embodiment 4) Next, Embodiment 4 will be described with reference to Figure 6. Figure 6 is a schematic diagram showing the overall configuration of the ventilation system 100c in Embodiment 4. In the following description, components that are substantially the same as those in Embodiment 1 will be given the same reference numerals, and their descriptions will be simplified or omitted.

[0114] In Embodiment 1, an example was shown in which the ventilation system 100 is composed of a first ventilation device 1 and a second ventilation device 2. However, in a typical house, additional ventilation devices such as a range hood and a toilet exhaust fan are usually installed, and each of these is typically equipped with a blower. Therefore, in Embodiment 3, in order to construct a ventilation system at a lower cost by reducing the number of blowers used for ventilation of the building, an example is described in which exhaust from the toilet is exhausted by a first exhaust blower 9 and a second exhaust blower 11.

[0115] The ventilation system 100c comprises exhaust air passages 120i, 120j, 120k, 120l, and 120m, collectively referred to as the exhaust air passage 120.

[0116] The exhaust air passage 120i is an air passage that guides indoor air to the confluence point 80. More specifically, the exhaust air passage 120i is an air passage that guides indoor air through the duct 121 and the heat exchange element 30 in that order to the confluence point 80.

[0117] The confluence point 80 is the position where the air from the exhaust air passage 120i and the air from the exhaust air passage 120j merge. The confluence point 80 is a space located downstream of the heat exchange element 30 and upstream of the duct 130 in the exhaust air passage 120. In other words, the confluence point 80 is the space downstream of the heat exchange element 30 in the exhaust air passage 120 within the first ventilation system 1.

[0118] The exhaust air passage 120j is an air passage that guides the toilet air to the first ventilation device 1. More specifically, the exhaust air passage 120j is an air passage that guides the toilet air to the first ventilation device 1 via the duct 129.

[0119] The exhaust air passage 120k is an air passage that guides the air blown out from the first ventilation device 1 to the second ventilation device 2. More specifically, the exhaust air passage 120k guides the air blown out from the first ventilation device 1 to the second ventilation device 2 via the duct 130.

[0120] The exhaust air passage 120l is an air passage that guides bathroom air to the second ventilation device 2. More specifically, the exhaust air passage 120l guides bathroom air to the second ventilation device 2 via duct 151.

[0121] The exhaust air passage 120m is an air passage that guides the air blown out from the second ventilation device 2 to the outside. More specifically, the exhaust air passage 120m guides the air blown out from the second ventilation device 2 to the outside via a duct. The exhaust is directed outdoors via port 131.

[0122] The ventilation system 100c includes a toilet intake port 3, a duct 129, a duct 130, a duct 131, and a damper 12.

[0123] The toilet intake port 3 is an opening for drawing in air from the toilet. The toilet intake port 3 is installed, for example, on the ceiling of the toilet.

[0124] The duct 129 forms part of the exhaust air passage 120 and is a component that guides the air drawn in by the toilet intake 3 into the interior of the first ventilation device 1. More specifically, the duct 129 guides the air downstream of the heat exchange element 30 in the exhaust air passage 120 within the first ventilation device 1.

[0125] The duct 130 forms part of the exhaust air passage 120 and is a component that guides the air blown out by the first ventilation device 1 to the second ventilation device 2. More specifically, the duct 130 guides the indoor air and toilet air, which have been mixed in the first ventilation device 1, to the second ventilation device 2.

[0126] Duct 131 forms part of the exhaust air passage 120 and is a component that guides the air blown out from the second ventilation device 2 to the outside. Duct 131 mixes the air from the indoors, toilet, and bathroom before exhausting it to the outside.

[0127] The damper 12 is provided at the connection point between the duct 121 and the first ventilation device 1. The damper 12 operates in the same manner as the damper 12 in Embodiment 1. Specifically, the damper 12 allows exhaust gas to flow into the first ventilation device 1 during heat exchange ventilation operation, and prevents exhaust gas from flowing into the first ventilation device 1 during normal ventilation operation.

[0128] As described above, in Embodiment 4, the first ventilation device 1 draws in exhaust air from the toilet downstream of the heat exchange element 30 in the exhaust air passage 120 and blows it out toward the second ventilation device 2. The second ventilation device 2 mixes the air blown out by the first ventilation device 1 with the air drawn in from the bathroom and exhausts it outdoors.

[0129] With this configuration, the air in the toilet can be exhausted by the first exhaust fan 9 and the second exhaust fan 11 without the need to install a separate fan in the toilet. In other words, a building ventilation system can be constructed at a lower cost.

[0130] Furthermore, since the exhaust from the toilet flows downstream of the heat exchange element 30 within the first ventilation device 1, toilet odors are less likely to adhere to the heat exchange element 30. Therefore, it is possible to suppress the supply of odors attached to the heat exchange element 30 into the room, for example, during heat exchange. In other words, a ventilation system can be constructed more inexpensively without compromising comfort. (Embodiment 5) Next, Embodiment 5 will be described with reference to Figure 7. Figure 7 is a schematic diagram showing the overall configuration of the ventilation system 100d in Embodiment 5. In the following description, components that are substantially the same as those in Embodiment 1 will be given the same reference numerals, and their descriptions will be simplified or omitted.

[0131] In Embodiment 1, an example was shown in which the ventilation system 100 is composed of a first ventilation device 1 and a second ventilation device 2. However, as mentioned above, in a typical house, additional ventilation systems such as a range hood and a toilet exhaust fan are usually installed, and each of these is typically equipped with a blower. Therefore, in Embodiment 5, in order to construct a ventilation system at a lower cost by reducing the number of blowers used for ventilation of the building, an example is described in which exhaust from the toilet is exhausted using a second exhaust blower 11 of the second ventilation device 2.

[0132] The ventilation system 100d includes an exhaust air passage 120n, an exhaust air passage 120o, an exhaust air passage 120p, and an exhaust air passage 120q.

[0133] The exhaust air passage 120n is an air passage that guides indoor air to the second ventilation device 2. More specifically, the exhaust air passage 120n is an air passage that circulates indoor air in the order of duct 121, first ventilation device 1, and duct 132, and guides it to the second ventilation device 2.

[0134] The exhaust air passage 120o is an air passage that guides the toilet air to the second ventilation device 2. More specifically, the exhaust air passage 120o is an air passage that guides the toilet air to the second ventilation device 2 via the duct 134.

[0135] The exhaust air passage 120p is an air passage that guides bathroom air to the second ventilation device 2. More specifically, the exhaust air passage 120p guides bathroom air to the second ventilation device 2 via the duct 151.

[0136] The exhaust air passage 120q is an air passage that guides the air blown out by the second ventilation device 2 to the outside. More specifically, the exhaust air passage 120q exhausts the air blown out by the second ventilation device 2 to the outside via the duct 133.

[0137] The ventilation system 100d includes a toilet intake port 3, duct 132, duct 134, and duct 133.

[0138] The toilet intake port 3 is an opening for drawing in air from the toilet. The toilet intake port 3 is installed, for example, on the ceiling of the toilet.

[0139] Duct 132 forms part of the exhaust air passage 120 and is a component that guides the air blown out by the first ventilation device 1 to the second ventilation device 2. More specifically, it guides the indoor air drawn in by the first ventilation device 1 via duct 121 to the second ventilation device 2.

[0140] The duct 134 forms part of the exhaust air passage 120 and is a component that guides the air drawn in by the toilet intake 3 into the interior of the second ventilation device 2.

[0141] Duct 133 forms part of the exhaust air passage 120 and is a component that guides the air blown out from the second ventilation device 2 to the outside. More specifically, duct 133 mixes the indoor, toilet, and bathroom air before exhausting it to the outside.

[0142] As described above, in Embodiment 5, the second ventilation device 2 draws in air from the toilet and the bathroom. The second ventilation device 2 also mixes the air drawn in from the toilet and bathroom with the air blown out by the first ventilation device 1 and exhausts it outdoors.

[0143] With this configuration, the air in the toilet can be exhausted by the first exhaust fan 9 and the second exhaust fan 11 without the need to install a separate fan in the toilet. In other words, a building ventilation system can be constructed at a lower cost. (modified version) The embodiments described so far are illustrative, and it will be understood by those skilled in the art that various modifications are possible for each component or combination of processing steps, and that such modifications are also within the scope of this disclosure. Modifications of the configurations shown in Embodiments 1 to 5 will now be described.

[0144] In Embodiment 1, when the second ventilation device 2 is operating (No. S103 in Figure 3) An example of performing normal ventilation operation is shown in ( ), but it is not limited to this. For example, when the second ventilation device 2 is operating, the ventilation system 100 may adjust the airflow balance of each fan to perform heat exchange ventilation operation. Details will be explained with reference to Figure 8. Figure 8 is a flowchart showing the flow of the normal ventilation determination process S200 in a modified example. In the following description, only the differences from Embodiment 1 will be explained.

[0145] In the normal ventilation determination process S200, if the second ventilation device 2 is operating (No. in S103), the control unit 20 sets the airflow rate of the supply air blower 10 to A1 [m³ 3 Let the airflow of the first exhaust blower 9 be B3[m³ / h], and set the airflow of the first exhaust blower 9 to B3[m³ / h]. 3 Let / h] (S120). Note that B3 is, for example, "15m 3 It is " / h".

[0146] Next, the control unit 20 controls the airflow of the second exhaust fan 11 to C2[m 3 Let / h] (S121). It is preferable that the relationship between C2 and B3 be C2 > B3. Specifically, C2 is, for example, "90m 3 The value is " / h". Furthermore, the relationship between A1, B3, and C2 should preferably be A1 ≥ (B3 + C2) in order to suppress negative pressure indoors.

[0147] Next, the process returns to S103 to determine the operating status of the second ventilation device 2. In other words, the control unit 20 maintains the settings of S120 and S121 as long as the second ventilation device 2 is operating, that is, as long as the second ventilation device 2 is not OFF. To put it another way, the control unit 20 sets the airflow rate of the supply air blower 10 to A1[m 3 / h], the airflow of the first exhaust blower 9 is B3[m 3 / h], the airflow of the second exhaust blower 11 is C2[m 3 Maintain the airflow rate of the air supply fan 10 at "105m / h". In other words, the control unit 20 controls the airflow rate of the air supply fan 10 at "105m / h". 3 / h", the airflow of the first exhaust fan 9 is "15m 3 / h", the airflow of the second exhaust blower 11 is "90m 3 Maintain " / h"

[0148] In Embodiment 1, as shown in Figure 1, the damper 12 is installed at the connection point between the duct 121 and the first ventilation device 1, but the embodiment is not limited to this. The damper 12 may also be installed in the exhaust air passage 120 between the heat exchange element 30 and the second ventilation device 2.

[0149] With this configuration, when the damper 12 blocks the airflow from the first ventilation device 1 to the second ventilation device 2 (normal ventilation operation), it is possible to suppress the intrusion of air drawn in from the bathroom into the room via the heat exchange element 30. In other words, it is possible to suppress the decrease in heat exchange efficiency due to condensation on the heat exchange element 30. In addition, it is possible to make it difficult for high-humidity air to flow into the room, thus maintaining indoor comfort.

[0150] In embodiments 4 and 5, a configuration without a toilet fan was described in order to construct a ventilation system at a lower cost, but the system is not limited to this. In other words, a toilet fan may be provided and a normal ventilation operation process as shown in Figure 3 may be performed. In this case, it is preferable that the airflow of each fan during normal ventilation operation be designed such that the airflow from the supply fan 10 is equal to or greater than the total airflow of the first exhaust fan 9, the second exhaust fan 11, and the toilet fan. [Industrial applicability]

[0151] This invention can be used in ventilation systems for ventilating buildings. [Explanation of Symbols]

[0152] 1. First ventilation system 2. Second ventilation system 3. Toilet intake 7 Remote control 8. Indoor temperature sensor 9. First exhaust fan 10. Air supply fan 11. Second exhaust fan 12 dampers 15 Outdoor temperature sensor 20 Control Unit 21 Operating status acquisition unit 22 Temperature acquisition section 23 Operation Judgment Unit 24. Operation control unit 30 Heat exchange element 70 Mixing section 74, 75 Outdoor outlet 80 Confluence 100, 100a, 100b, 100c, 100d Ventilation System 110 Air intake duct 120, 120a, 120b, 120c, 120d, 120e, 120f, 120g, 120h, 120i, 120j, 120k, 120l, 120m, 120n, 120o, 120p, 120q Exhaust air passage 111, 112, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 151 ducts 150 Bathroom intake

Claims

1. An air intake duct that guides outdoor air into the building, An exhaust duct that guides indoor air to the outside, An outdoor temperature sensor that detects the outdoor temperature, An indoor temperature sensor that detects indoor temperature, A first ventilation system having an air supply fan, a first exhaust fan, and a heat exchange element that exchanges heat between the air in the air supply passage and the air in the exhaust passage, A second ventilation system having a second exhaust fan, A control unit that controls the operation of the first ventilation device and the second ventilation device, Equipped with, The control unit, based on the operating status of the second ventilation system and the detection results of the outdoor temperature sensor and the indoor temperature sensor, reduces the airflow of the first exhaust fan without stopping the first exhaust fan and increases the airflow of the second exhaust fan. Ventilation system.

2. The control unit, When the second exhaust fan is not operating, Based on the detection results of the outdoor temperature sensor and the indoor temperature sensor, The airflow of the first exhaust fan is reduced, and the operation of the second exhaust fan is started. The ventilation system according to claim 1.

3. The control unit, When the second exhaust fan is in operation, The airflow rate of the second exhaust fan is set to be less than or equal to the airflow rate of the supply fan. When the second exhaust fan is not operating, The detection results of the outdoor temperature sensor and the indoor temperature sensor are acquired. Determine whether the outdoor temperature is above a predetermined temperature and whether the indoor temperature is above the outdoor temperature. If the outdoor temperature is above a predetermined temperature and the indoor temperature is above the outdoor temperature, Start the operation of the second exhaust fan, The airflow rate of the second exhaust fan is set to be less than or equal to the airflow rate of the supply fan. If the outdoor temperature is above a predetermined temperature and the indoor temperature is not above the outdoor temperature, Maintain the airflow of the first exhaust fan and the supply fan. The ventilation system according to claim 1.

4. The first ventilation device is equipped with a damper that adjusts the amount of air flowing through the exhaust air passage inside the first ventilation device, The control unit, When the second exhaust fan is in operation, The airflow rate of the second exhaust fan is set to be less than or equal to the airflow rate of the supply fan. The damper blocks the exhaust air passage inside the first ventilation device. When the second exhaust fan is not operating, The detection results of the outdoor temperature sensor and the indoor temperature sensor are acquired. Determine whether the outdoor temperature is above a predetermined temperature and whether the indoor temperature is above the outdoor temperature. If the outdoor temperature is above a predetermined temperature and the indoor temperature is above the outdoor temperature, Start the operation of the second exhaust fan, The airflow rate of the second exhaust fan is set to be less than or equal to the airflow rate of the supply fan. The damper blocks the exhaust air passage inside the first ventilation device. If the outdoor temperature is above a predetermined temperature and the indoor temperature is not above the outdoor temperature, Maintain the airflow of the first exhaust fan and the supply fan. The ventilation system according to claim 1.

5. The ventilation system according to claim 1, wherein the second ventilation device mixes the air drawn in from the bathroom with the air blown out by the first ventilation device and exhausts the mixture to the outside.

6. The ventilation system according to claim 1, further comprising a mixing unit that mixes the air blown out by the first ventilation device and the air blown out by the second ventilation device and exhausts the mixture to the outside.

7. The ventilation system according to claim 1, wherein the air blown out of the first ventilation device toward the outside is exhausted to the outside without passing through the second ventilation device.

8. The first ventilation device draws in exhaust air from the toilet downstream of the heat exchange element in the exhaust air passage and blows it out toward the second ventilation device. The second ventilation device mixes the air blown out by the first ventilation device with the air drawn in from the bathroom and exhausts it outdoors. The ventilation system according to claim 1.

9. The aforementioned second ventilation device is, It sucks in the air from the toilet and the bathroom. The air drawn in from the toilet and bathroom is mixed with the air blown out by the first ventilation device and exhausted outdoors. The ventilation system according to claim 1.

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