ventilation system

Abstract

To provide a ventilation system capable of preventing an indoor space from being subjected to a negative pressure even when an exhaust device and a ventilation device are operated.SOLUTION: A ventilation system comprises a ventilation device, an exhaust device, and a controller which controls operation of the ventilation device and the exhaust device. The controller has a determination section which determines whether the exhaust device is in operation. The controller executes: a first operation mode, when the determination section determines that the exhaust device is not in operation, which includes operation to control an exhaust blower so that an exhaust air flow rate becomes a first air flow rate and operation to control an air supply blower so that an air supply flow rate becomes the first air flow rate; and a second operation mode, when the determination section determines that the exhaust device is in operation, which includes operation to control the exhaust blower so that the exhaust air flow rate becomes a second air flow rate smaller than the first air flow rate and operation to control the air supply blower so that the air supply flow rate becomes a third flow rate larger than the first air flow rate.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a ventilation system for ventilating air in an indoor space. [Background technology]

[0002] Patent Document 1 discloses a ventilation system that supplies comfortable air to a room while reducing power consumption. The ventilation system includes a first ventilation device having an air supply / blower section, an air exhaust section, and a heat exchanger, and a second ventilation device that exhausts air from the bathroom. The air supply / blower section includes an air supply motor and an air supply fan. The exhaust section includes an exhaust motor and an exhaust fan. The heat exchanger exchanges heat between the air supplied into the room and the air exhausted to the outside. When the second ventilation device performs exhaust operation, the first ventilation device continues exhaust operation while reducing the rotation speed of the exhaust motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-134121 Summary of the Invention [Problem to be solved by the invention]

[0004] When the total air supply volume for an indoor space becomes smaller than the total air exhaust volume due to the operation of multiple ventilation devices, the indoor space becomes negative pressure (also called negative pressure). When the indoor space becomes negative pressure, air from the outdoor space may enter the indoor space through unintended parts such as gaps in the building. The technology disclosed in Patent Document 1 leaves room for improvement in terms of preventing the indoor space from becoming negative pressure when the exhaust device and the ventilation device are operated.

[0005] One object of the present disclosure is to provide a ventilation system that can prevent the indoor space from becoming negative pressure even when the exhaust device and the ventilation device are operating. [Means for solving the problem]

[0006] The ventilation system of the present disclosure includes a ventilation device having an exhaust fan that generates an exhaust flow that flows from an indoor space to an outdoor space and an intake fan that generates an intake air flow that flows from the outdoor space to the indoor space, an exhaust device that exhausts air from the indoor space to the outdoor space, and a controller that controls the operation of the ventilation device and the exhaust device. a first temperature sensor for measuring a temperature of the indoor space; and a humidity sensor for measuring a humidity of the indoor space; Equipped with. The ventilation system includes a heat exchange element for exchanging heat between the exhaust air flow and the intake air flow, and a second temperature sensor for measuring the temperature of the intake air flow. The controller has a determination unit that determines whether the exhaust system is in operation. Additionally, the controller The air conditioner has a dew point temperature calculation unit that calculates the dew point temperature of the air in the indoor space based on the temperature of the indoor space measured by the first temperature sensor and the humidity of the indoor space measured by the humidity sensor, and a temperature comparison unit that compares the dew point temperature calculated by the dew point temperature calculation unit with the temperature of the supply air flow measured by the second temperature sensor. When the determination unit determines that the exhaust device is not operating, the controller executes a first operating mode including an operation of controlling the exhaust fan so that the exhaust flow is a first airflow rate and an operation of controlling the intake fan so that the intake flow is a first airflow rate.When the determination unit determines that the exhaust device is operating, the controller executes a second operating mode including an operation of controlling the exhaust fan so that the exhaust flow is a second airflow rate smaller than the first airflow rate and an operation of controlling the intake fan so that the intake flow is a third airflow rate larger than the first airflow rate. Furthermore, when the second operating mode is being executed and the temperature comparison unit compares the temperature of the supply airflow to be lower than the dew point temperature, the controller stops the second operating mode and starts the first operating mode. The present disclosure also provides a ventilation system including a ventilation device having an exhaust fan that generates an exhaust air flow from an indoor space to an outdoor space and an intake fan that generates an intake air flow from the outdoor space to the indoor space, an exhaust device that exhausts air from the indoor space to the outdoor space, an intake air device that supplies air from the outdoor space to the indoor space, and a controller that controls the operation of the ventilation device and the exhaust device. The controller has a determination unit that determines whether the exhaust device is operating. When the determination unit determines that the exhaust device is not operating, the controller executes a first operating mode that includes an operation of controlling the exhaust fan to operate so that the exhaust air flow is a first airflow rate and an operation of controlling the intake fan to operate so that the intake air flow is a first airflow rate. Furthermore, when the determination unit determines that the exhaust device is operating, the controller executes a third operating mode that includes an operation of controlling the exhaust blower so that the exhaust flow becomes a second air volume that is smaller than the first air volume, an operation of controlling the intake blower so that the intake flow becomes a third air volume that is larger than the first air volume, and an operation of starting the operation of the intake device. [Effects of the Invention]

[0007] The ventilation system of the present disclosure can adjust the intake airflow rate and exhaust airflow rate of the ventilation device depending on whether the exhaust device is operating or not, thereby preventing the indoor space from becoming negative pressure even when the exhaust device and the ventilation device are operating. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a ventilation system according to the first embodiment. [Figure 2] FIG. 2 is a schematic diagram showing the configuration of the ventilation device according to the first embodiment. [Figure 3] FIG. 3 is a circuit block diagram showing a configuration of the controller according to the first embodiment. [Figure 4] FIG. 4 is a flowchart showing the flow of operational control of the ventilation device and the exhaust device in the first embodiment. [Figure 5] FIG. 5 is a schematic diagram showing the configuration of a ventilation system according to the second embodiment. [Figure 6] FIG. 6 is a schematic diagram showing the configuration of a ventilation device according to the second embodiment. [Figure 7] FIG. 7 is a circuit block diagram showing the configuration of the controller according to the second embodiment. [Figure 8] FIG. 8 is a flowchart showing the flow of operational control of the ventilation device, the exhaust device, and the air supply device in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described in detail with reference to the drawings. However, unnecessary detailed description may be omitted. For example, detailed description of well-known matters or redundant description of substantially the same configuration may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art.

[0010] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0011] (Embodiment 1) Hereinafter, the first embodiment will be described with reference to FIGS.

[0012] [1-1.Configuration] As shown in FIG. 1, a ventilation system 1 adjusts the volume of air exhausted from an indoor space S such as a house and the volume of air supplied to the indoor space S by interlocking a ventilation device 10 and an exhaust device 20. The indoor space S indicates a living space such as a living room. The air volume is the volume of air exhausted from the indoor space S per unit time (unit: m3 / h) / the volume of air supplied to the indoor space S per unit time (unit: m3 / h). The ventilation system 1 includes a first temperature sensor 3, a humidity sensor 4, the ventilation device 10, the exhaust device 20, and a controller 30.

[0013] The first temperature sensor 3 measures the temperature T1 (unit: ° C.) of the indoor space S. The first temperature sensor 3 is provided integrally with the controller 30.

[0014] The humidity sensor 4 measures the humidity H1 (unit: %) of the indoor space S. The humidity sensor 4 is provided integrally with the controller 30.

[0015] As shown in FIG. 1, a ventilation device 10 ventilates the air in an indoor space S with an exhaust air flow AF1 and an intake air flow AF2. The exhaust air flow AF1 is an air flow generated by an exhaust air blower 11 (described later) and directed from the indoor space S to the outdoor space. The intake air flow AF2 is an air flow generated by an intake air blower 12 (described later) and directed from the outdoor space to the indoor space S. The ventilation device 10 is connected to a duct 2a through which the exhaust air flow AF1 and the intake air flow AF2 circulate, thereby communicating with the indoor space S and the outdoor space. The ventilation device 10 is placed above the ceiling of the indoor space S using a hanging bracket.

[0016] As shown in FIG. 2, the ventilation device 10 has an exhaust fan 11, an intake fan 12, a heat exchange element 13, an RA opening 14, an EA opening 15, an OA opening 16, an SA opening 17, and a second temperature sensor 18.

[0017] Exhaust fan 11 generates exhaust flow AF1. Exhaust fan 11 is disposed in an exhaust air passage through which exhaust flow AF1 flows, downstream of heat exchange element 13. Exhaust fan 11 has a fan that pressurizes the air and a motor that rotatably supports the fan, and employs a known centrifugal fan.

[0018] Intake air blower 12 generates intake airflow AF2. Intake air blower 12 is disposed in an intake airflow path through which intake airflow AF2 flows, downstream of heat exchange element 13. Intake air blower 12 has a fan that pressurizes the air and a motor that rotatably supports the fan, and employs a known centrifugal blower.

[0019] Heat exchange element 13 exchanges total heat contained in exhaust airflow AF1 with total heat contained in intake airflow AF2. Heat exchange element 13 constitutes a part of an exhaust airflow path through which exhaust airflow AF1 flows and a part of an intake airflow path through which intake airflow AF2 flows.

[0020] The RA opening 14 is an opening for drawing the exhaust air flow AF1 into the ventilation device 10. The RA opening 14 constitutes a part of the exhaust air passage through which the exhaust air flow AF1 flows. The RA opening 14 is connected to the duct 2a and thereby communicates with the indoor space S. RA is an abbreviation for Return Air.

[0021] The EA opening 15 is an opening for blowing out the exhaust airflow AF1 from the ventilation device 10. The EA opening 15 constitutes a part of an exhaust air passage through which the exhaust airflow AF1 flows. The EA opening 15 is connected to the duct 2a and thereby communicates with the outdoor space. EA is an abbreviation for Exhaust Air.

[0022] The OA opening 16 is an opening for drawing the supply airflow AF2 into the ventilation device 10. The OA opening 16 constitutes a part of the supply air passage through which the supply airflow AF2 flows. The OA opening 16 is connected to the duct 2a and communicates with the outdoor space. OA stands for Outside Air.

[0023] The SA opening 17 is an opening for blowing out the supply airflow AF2 from the ventilation device 10. The SA opening 17 constitutes a part of the supply air passage through which the supply airflow AF2 flows. The SA opening 17 is connected to the duct 2a and thereby communicates with the indoor space S. SA is an abbreviation for Supply Air.

[0024] The second temperature sensor 18 measures the temperature T2 (unit: °C) of the intake airflow AF2. The second temperature sensor 18 is disposed downstream of the heat exchange element 13 in the intake airflow path through which the intake airflow AF2 flows. That is, the second temperature sensor 18 measures the temperature T2 of the intake airflow AF2 after exchanging thermal energy with the exhaust airflow AF1.

[0025] As shown in FIG. 1 , the exhaust device 20 exhausts air from the indoor space S via an exhaust flow AF3. The exhaust flow AF3 is an airflow generated by a blower (not shown) included in the exhaust device 20 and directed from the indoor space S to the outdoor space. The exhaust device 20 is connected to a duct 2b through which the exhaust flow AF3 flows, thereby communicating between the indoor space S and the outdoor space. The exhaust device 20 is fixed by a hanging bracket above a cooking appliance. The exhaust device 20 is a range hood that exhausts air containing oily smoke generated by cooking from the indoor space S to the outdoor space. Note that the cooking appliance is not included in the ventilation system 1.

[0026] The controller 30 is electrically and communicatively connected to the first temperature sensor 3, the humidity sensor 4, the ventilation device 10, and the exhaust device 20, and comprehensively controls the ventilation system 1. The controller 30 is provided integrally with the first temperature sensor 3 and the humidity sensor 4. The controller 30 is installed on a wall surface of the indoor space S.

[0027] 3 can be realized in hardware by elements and mechanical devices such as a computer CPU (Central Processing Unit), and in software by a computer program, etc., but here, the functional blocks are depicted as being realized by the cooperation of these. Therefore, those skilled in the art who have read this specification will understand that these functional blocks can be realized in various ways by combining hardware and software.

[0028] The controller 30 has an operation information receiving unit 31, a judgment unit 32, a temperature and humidity information receiving unit 33, a dew point temperature calculation unit 34, a temperature comparison unit 35, a processing unit 36, a first operation control unit 37, and a second operation control unit 38.

[0029] The operation information receiving unit 31 receives information related to the operation of the exhaust device 20. The information related to the operation of the exhaust device 20 is a signal indicating ON / OFF of the operation of the exhaust device 20. The operation information receiving unit 31 transmits the received information related to the operation of the exhaust device 20 to the determination unit 32.

[0030] The determination unit 32 determines whether or not the exhaust device 20 is in operation based on the information received from the operation information receiving unit 31. The determination unit 32 transmits information relating to the determination result as to whether or not the exhaust device 20 is in operation to the processing unit 36.

[0031] The temperature and humidity information receiving unit 33 receives information related to the temperature T1 of the indoor space S measured by the first temperature sensor 3, information related to the humidity H1 of the indoor space S measured by the humidity sensor 4, and information related to the temperature T2 of the supply airflow AF2 measured by the second temperature sensor 18. The information related to the temperature T1 may be the temperature value itself or a value converted into another value such as a voltage value. The information related to the humidity H1 may be the humidity value itself or a value converted into another value such as a voltage value. The information related to the temperature T2 may be the temperature value itself or a value converted into another value such as a voltage value. The temperature and humidity information receiving unit 33 transmits the information related to the temperature T1 and the information related to the humidity H1 to the dew point temperature calculation unit 34 and transmits the information related to the temperature T2 to the temperature comparison unit 35.

[0032] The dew-point temperature calculation unit 34 calculates the dew-point temperature DP of the indoor space S based on the information related to the temperature T1 of the indoor space S and the information related to the humidity H1 of the indoor space S transmitted from the temperature and humidity information receiving unit 33. The dew-point temperature DP is the temperature (unit: °C) at which condensation of moisture contained in the air in the indoor space S begins. When the temperature T1 becomes lower than the dew-point temperature DP, condensation of moisture in the air begins, increasing the possibility of condensation occurring in the indoor space S. The dew-point temperature calculation unit 34 transmits information related to the calculated dew-point temperature DP of the indoor space S to the temperature comparison unit 35. The information related to the dew-point temperature DP of the indoor space S may be a temperature value itself, or may be a value converted into another value such as a voltage value.

[0033] The temperature comparison unit 35 receives information related to the temperature T2 of the supply airflow AF2 transmitted from the temperature and humidity information receiving unit 33, and information related to the dew-point temperature DP of the indoor space S transmitted from the dew-point temperature calculation unit. Based on the received information related to the temperature T2 and the dew-point temperature DP, the temperature comparison unit 35 compares the magnitude relationship between the temperature T2 and the dew-point temperature DP. The temperature comparison unit 35 transmits the result of comparing the magnitude relationship between the temperature T2 and the dew-point temperature DP to the processing unit 36.

[0034] The processing unit 36 ​​executes processing based on the information transmitted from the judgment unit 32 and the information transmitted from the temperature comparison unit 35, and outputs the results of the processing to either or both of the first operation control unit 37 and the second operation control unit 38.

[0035] The first operation control unit 37 controls the operation of the exhaust fan 11 based on the information output from the processing unit 36. The information output from the processing unit 36 ​​includes information related to the operation output of the exhaust fan 11, including whether the operation is ON or OFF.

[0036] Second operation control unit 38 controls the operation of air supply fan 12 based on information output from processing unit 36. The information output from processing unit 36 ​​includes information related to the operation output of air supply fan 12, including whether the operation is ON or OFF.

[0037] [1-2. Operation] In the ventilation system 1 configured as above, the operation control of the ventilation device 10 and the exhaust device 20 by the controller 30 will be described with reference to FIG.

[0038] (Step S1) When the operation of the ventilation device 10 is started, the controller 30 executes a first operation mode including an operation of controlling the operation of the exhaust fan 11 so that the exhaust flow AF1 is at a first airflow rate Q1 [m3 / h] and an operation of controlling the operation of the intake fan 12 so that the intake flow AF2 is at the first airflow rate Q1 [m3 / h]. After executing the first operation mode, the controller 30 executes step S2.

[0039] (Step S2) The controller 30 uses the determination unit 32 to determine whether or not the exhaust device 20 is currently operating. If the determination unit 32 determines that the exhaust device 20 is not currently operating (N in step S2), the controller 30 repeats step S2. If the determination unit 32 determines that the exhaust device 20 is currently operating (Y in step S2), the controller 30 executes step S3.

[0040] (Step S3) The controller 30 executes a second operation mode including an operation of controlling the operation of the exhaust blower 11 so that the exhaust air flow AF1 becomes a second air volume Q2 [m3 / h] smaller than the first air volume Q1 [m3 / h], and an operation of controlling the operation of the supply blower 12 so that the supply air flow AF2 becomes a third air volume Q3 [m3 / h] larger than the first air volume Q1 [m3 / h]. The magnitude relationship among the first air volume Q1, the second air volume Q2, and the third air volume Q3 is Q2 < Q1 < Q3. After executing the second operation mode, the controller 30 executes step S4.

[0041] (Step S4) The controller 30 compares the temperature T2 of the supply air flow AF2 with the dew point temperature DP of the indoor space S using the temperature comparison unit 35. When the temperature T2 is equal to or higher than the dew point temperature DP as a result of the comparison by the temperature comparison unit 35 (N in step S4), the controller 30 continues to execute the second operation mode (returns to step S3). When the temperature T2 is lower than the dew point temperature DP as a result of the comparison by the temperature comparison unit 35, the controller 30 executes step S5.

[0042] (Step S5) The controller 30 stops the execution of the second operation mode and executes the first operation mode.

[0043] [1-3. Effects, etc.] As described above, in the present embodiment, the ventilation system 1 includes the ventilation device 10 having the exhaust fan 11 that generates the exhaust air flow AF1 that flows from the indoor space S to the outdoor space and the supply air fan 12 that generates the supply air flow AF2 that flows from the outdoor space to the indoor space S, the exhaust device 20 that exhausts air from the indoor space S to the outdoor space, and the controller 30 that controls the operation of the ventilation device 10 and the exhaust device 20. The controller 30 has a determination unit 32 that determines whether the exhaust device 20 is operating. When the determination unit 32 determines that the exhaust device 20 is not operating, the controller 30 executes a first operating mode that includes an operation of controlling the exhaust fan 11 so that the exhaust air flow AF1 has a first airflow rate Q1 [m3 / h] and an operation of controlling the supply air fan 12 so that the supply air flow AF2 has the first airflow rate Q1 [m3 / h]. When the determination unit 32 determines that the exhaust device 20 is currently operating, the controller 30 executes a second operating mode that includes an operation of controlling the exhaust fan 11 so that the exhaust flow AF1 becomes a second air volume Q2 [m3 / h] that is smaller than the first air volume Q1 [m3 / h], and an operation of controlling the intake fan 12 so that the intake flow AF2 becomes a third air volume Q3 [m3 / h] that is larger than the first air volume Q1 [m3 / h].

[0044] As a result, the sum of the air volumes of the exhaust airflows AF1 and AF3 in the second operating mode is smaller than when the air volume of the exhaust airflow AF1 is maintained at the first air volume Q1 [m3 / h]. Furthermore, the air volume of the supply airflow AF2 increases from the first air volume Q1 [m3 / h] to the third air volume Q3 [m3 / h] in the second operating mode. Therefore, by bringing the air volume of the supply airflow AF2 closer to the sum of the air volumes of the exhaust airflows AF1 and AF3, the negative pressure state in the indoor space S can be alleviated. Alternatively, by making the air volume of the supply airflow AF2 greater than the sum of the air volumes of the exhaust airflows AF1 and AF3, the indoor space S can be brought to a positive pressure (also referred to as positive pressure). In other words, the ventilation system 1 can prevent the indoor space S from becoming negative pressure even when the exhaust device 20 and the ventilation device 10 are operating.

[0045] In this embodiment, the ventilation system 1 includes a first temperature sensor 3 that measures the temperature T1 of the indoor space S and a humidity sensor 4 that measures the humidity H1 of the indoor space S. The ventilation device 10 includes a heat exchange element 13 that exchanges heat between the exhaust airflow AF1 and the supply airflow AF2 and a second temperature sensor 18 that measures the temperature T2 of the supply airflow AF2. The controller 30 includes a dew-point temperature calculation unit 34 that calculates a dew-point temperature DP of the air in the indoor space S based on the temperature T1 of the indoor space S measured by the first temperature sensor 3 and the humidity H1 of the indoor space S measured by the humidity sensor 4, and a temperature comparison unit 35 that compares the dew-point temperature DP calculated by the dew-point temperature calculation unit 34 with the temperature T2 of the supply airflow AF2 measured by the second temperature sensor 18. When the second operation mode is being executed and the temperature comparison unit 35 determines that the temperature T2 of the supply airflow AF2 is lower than the dew-point temperature DP, the controller 30 stops the second operation mode and starts the first operation mode.

[0046] As a result, by executing the first operation mode, which has a higher heat exchange efficiency than the second operation mode, the supply air flow AF2 having a temperature T2 lower than the dew point temperature DP is prevented from entering the indoor space S. As a result, the ventilation system 1 can reduce the possibility that condensation will occur near the opening provided on the ceiling surface of the indoor space S for blowing the supply air flow AF2 into the indoor space S, and that the condensed water droplets will fall on the floor of the indoor space S, causing discomfort to the occupants.

[0047] In the present embodiment, second temperature sensor 18 is disposed downstream of heat exchange element 13 in the air passage through which supply airflow AF2 passes.

[0048] This allows the ventilation system 1 to measure a temperature T2 that is close to the temperature of the supply airflow AF2 blown out into the indoor space S. Therefore, the ventilation system 1 can suppress condensation from occurring near the opening provided in the indoor space S for blowing out the supply airflow AF2.

[0049] (Embodiment 2) The second embodiment will be described below with reference to FIGS.

[0050] [2-1.Configuration] 5, ventilation system 101 according to embodiment 2 differs from ventilation system 1 according to embodiment 1 at least in that ventilation device 110 has third temperature sensor 119 and is provided with air supply device 140. Accordingly, the control methods for ventilation device 110, exhaust device 20, and air supply device 140 differ from those of embodiment 1, and therefore ventilation system 101 is provided with controller 130 instead of controller 30.

[0051] The air intake device 140 supplies air to the indoor space S via an intake airflow AF4. The intake airflow AF4 is an airflow that flows from the outdoor space to the indoor space S and is generated by a blower (not shown) that the air intake device 140 has. The air intake device 140 communicates with the indoor space S and the outdoor space by connecting to a duct 2c that allows the intake airflow AF4 to circulate. The air intake device 140 is installed above the ceiling of the indoor space S by a hanging bracket.

[0052] 6, the third temperature sensor 119 is disposed in the ventilation device 110. The third temperature sensor 119 measures the temperature T3 (unit: °C) of the intake airflow AF2. The third temperature sensor 119 is disposed upstream of the heat exchange element 13 in the intake airflow duct through which the intake airflow AF2 flows. In other words, the third temperature sensor 119 measures the temperature T3 of the intake airflow AF2 before exchanging thermal energy with the exhaust airflow AF1.

[0053] 7, the controller 130 is electrically and communicatively connected to the first temperature sensor 3, the humidity sensor 4, the ventilation device 110, the exhaust device 20, the third temperature sensor 119, and the air supply device 140. The controller 130 has a temperature and humidity information receiving unit 133, a temperature comparing unit 135, a processing unit 136, and a third operation control unit 139.

[0054] The temperature and humidity information receiving unit 133 receives information related to the temperature T1 of the indoor space S measured by the first temperature sensor 3, information related to the humidity H1 of the indoor space S measured by the humidity sensor 4, information related to the temperature T2 of the supply airflow AF2 measured by the second temperature sensor 18, and information related to the temperature T3 of the supply airflow AF2 measured by the third temperature sensor 119. The information related to the temperature T3 may be a temperature value itself or a value converted into another value such as a voltage value. The temperature and humidity information receiving unit 133 transmits the information related to the temperature T1 and the information related to the humidity H1 to the dew-point temperature calculation unit 34 and transmits the information related to the temperature T2 and the temperature T3 to the temperature comparison unit 135.

[0055] The temperature comparison unit 135 receives information related to the temperature T2 of the supply airflow AF2, information related to the temperature T3 of the supply airflow AF2, and information related to the dew-point temperature DP of the indoor space S, transmitted from the temperature and humidity information receiving unit 133. Based on the received information related to the temperature T2 and the dew-point temperature DP, the temperature comparison unit 135 compares the magnitude relationship between the temperature T2 and the dew-point temperature DP. The temperature comparison unit 135 transmits the result of the comparison between the magnitude relationship between the temperature T2 and the dew-point temperature DP to the processing unit 136. Based on the received information related to the temperature T3 and the dew-point temperature DP, the temperature comparison unit 135 compares the magnitude relationship between the temperature T3 and the dew-point temperature DP. The temperature comparison unit 135 transmits the result of the comparison between the magnitude relationship between the temperature T3 and the dew-point temperature DP to the processing unit 136.

[0056] The processing unit 136 executes processing based on the information transmitted from the judgment unit 32 and the information transmitted from the temperature comparison unit 135, and outputs the results of the processing to one or more of the first operation control unit 37, the second operation control unit 38, and the third operation control unit 139.

[0057] The third operation control unit 139 controls the operation of the air supply device 140 based on the information output from the processing unit 136. The information output from the processing unit 136 includes information related to the operation output of the air supply device 140, including whether the operation is ON or OFF.

[0058] [2-2. Operation] For the ventilation system 101 configured as described above, the operation control of the ventilation device 110, the exhaust device 20, and the air supply device 140 by the controller 130 will be described using FIG. 8.

[0059] (Step S101) When the controller 130 starts the operation of the ventilation device 110, it executes a first operation mode including an operation of controlling the operation of the exhaust blower 11 so that the exhaust air flow AF1 becomes the first air volume Q1 [m3 / h], and an operation of controlling the operation of the air supply blower 12 so that the air supply air flow AF2 becomes the first air volume Q1 [m3 / h]. The first operation mode stops the operation of the air supply device 140. After executing the first operation mode, the controller 130 executes step S102.

[0060] (Step S102) The controller 130 uses the determination unit 32 to determine whether the operation of the exhaust device 20 is in progress. When the determination unit 32 determines that the operation of the exhaust device 20 is not in progress (N in step S102), the controller 130 repeats step S2. When the determination unit 32 determines that the operation of the exhaust device 20 is in progress (Y in step S102), the controller 130 executes step S103.

[0061] (Step S103) The controller 130 executes a third operation mode including an operation of controlling the operation of the exhaust blower 11 so that the exhaust air flow AF1 becomes a second air volume Q2 [m3 / h] smaller than the first air volume Q1 [m3 / h], an operation of controlling the operation of the air supply blower 12 so that the air supply air flow AF2 becomes a third air volume Q3 [m3 / h] larger than the first air volume Q1 [m3 / h], and an operation of executing the operation of the air supply device 140. The magnitude relationship among the first air volume Q1, the second air volume Q2, and the third air volume Q3 is Q2 < Q1 < Q3. After executing the third operation mode, the controller 130 executes step S104.

[0062] (Step S104) Controller 130 uses temperature comparison unit 135 to compare temperature T2 of supply airflow AF2 with dew-point temperature DP of indoor space S. If temperature comparison unit 135 finds that temperature T2 is equal to or higher than dew-point temperature DP (N in step S104), controller 130 continues to execute the third operation mode (repeats step S104). If temperature comparison unit 135 finds that temperature T2 is lower than dew-point temperature DP, controller 130 executes step S105.

[0063] (Step S105) The controller 130 executes a fourth operating mode including an operation of controlling the operation of the exhaust fan 11 so that the exhaust flow AF1 is at the first airflow rate Q1 [m3 / h], an operation of controlling the operation of the supply fan 12 so that the supply flow AF2 is at the first airflow rate Q1 [m3 / h], and an operation of continuing the operation of the air supply device 140. After executing the fourth operating mode, the controller 130 executes step S106.

[0064] (Step S106) The controller 130 uses the temperature comparison unit 135 to compare the temperature T3 of the supply airflow AF2 with the dew-point temperature DP of the indoor space S. If the comparison result by the temperature comparison unit 135 shows that the temperature T2 is equal to or higher than the dew-point temperature DP (N in step S106), the controller 130 continues to execute the fourth operation mode (repeats step S106). If the comparison result by the temperature comparison unit 135 shows that the temperature T3 is lower than the dew-point temperature DP, the controller 130 executes step S107.

[0065] (Step S107) The controller 130 executes a first operating mode including an operation of controlling the operation of the exhaust fan 11 so that the exhaust flow AF1 becomes a first air volume Q1 [m3 / h], an operation of controlling the operation of the intake fan 12 so that the intake flow AF2 becomes a first air volume Q1 [m3 / h], and an operation of stopping the operation of the intake device 140.

[0066] [2-3. Effects, etc.] As described above, in this embodiment, ventilation system 101 includes air supply device 140 that supplies air from the outdoor space to indoor space S. When determination unit 32 determines that exhaust device 20 is operating, controller 130 executes a third operation mode that includes an operation of controlling exhaust fan 11 so that exhaust flow AF1 is at a second air volume Q2 [m3 / h] that is smaller than the first air volume Q1 [m3 / h], an operation of controlling intake fan 12 so that intake flow AF2 is at a third air volume Q3 [m3 / h] that is larger than the first air volume Q1 [m3 / h], and an operation of starting operation of air supply device 140.

[0067] As a result, the sum of the air volumes of the exhaust airflows AF1 and AF3 in the third operating mode is smaller than when the air volume of the exhaust airflow AF1 is maintained at the first air volume Q1 [m3 / h]. Furthermore, in the third operating mode, the air volume of the supply airflow AF2 increases from the first air volume Q1 [m3 / h] to the third air volume Q3 [m3 / h]. Furthermore, in the third operating mode, the amount of air supplied to the indoor space S is greater than in the first operating mode (before the air supply device 140 started operating). Therefore, by bringing the sum of the air volumes of the supply airflows AF2 and AF4 closer to the sum of the air volumes of the exhaust airflows AF1 and AF3, the negative pressure state in the indoor space S can be alleviated. Alternatively, by making the sum of the air volumes of the supply airflows AF2 and AF4 greater than the sum of the air volumes of the exhaust airflows AF1 and AF3, the indoor space S can be brought to a positive pressure (also referred to as positive pressure). That is, the ventilation system 1 can prevent the indoor space S from becoming negative pressure even when the exhaust device 20 and the ventilation device 110 are operating.

[0068] In this embodiment, the ventilation system 101 includes a first temperature sensor 3 that measures the temperature T1 of the indoor space S and a humidity sensor 4 that measures the humidity H1 of the indoor space S. The ventilation device 110 includes a heat exchange element 13 that exchanges heat between the exhaust airflow AF1 and the supply airflow AF2, and a second temperature sensor 18 that measures the temperature T2 of the supply airflow AF2. The controller 130 includes a dew-point temperature calculation unit 34 that calculates a dew-point temperature DP of the air in the indoor space S based on the temperature T1 of the indoor space S measured by the first temperature sensor 3 and the humidity H1 of the indoor space S measured by the humidity sensor 4, and a temperature comparison unit 135 that compares the dew-point temperature DP calculated by the dew-point temperature calculation unit 34 with the temperature T2 of the supply airflow AF2 measured by the second temperature sensor 18. When the controller 130 is executing the third operating mode and the temperature comparison unit 135 compares and finds that the temperature T2 of the intake air flow AF2 is lower than the dew point temperature DP, the controller 130 stops executing the third operating mode and executes a fourth operating mode which includes an operation of controlling the operation of the exhaust blower 11 so that the exhaust air flow AF1 has a first air volume Q1 [m3 / h], an operation of controlling the operation of the intake air blower 12 so that the intake air flow AF2 has a first air volume Q1 [m3 / h], and an operation of continuing the operation of the intake air device 140.

[0069] As a result, by executing the fourth operation mode, which has a higher heat exchange efficiency than the third operation mode, the supply airflow AF2 having a temperature T2 lower than the dew-point temperature DP is prevented from entering the indoor space S. Furthermore, by continuing to operate the air supply device 140, the sum of the air volumes of the supply airflows AF2 and AF4 approaches the sum of the air volumes of the exhaust airflows AF1 and AF3, thereby alleviating the negative pressure state in the indoor space S. Alternatively, by making the sum of the air volumes of the supply airflows AF2 and AF4 greater than the sum of the air volumes of the exhaust airflows AF1 and AF3, the indoor space S can be made positively pressurized. Therefore, the ventilation system 101 can prevent condensation from forming near an opening on the ceiling surface of the indoor space S through which the supply airflow AF2 is blown into the indoor space S, causing discomfort to the occupants, and can prevent the indoor space S from becoming negatively pressurized even when the exhaust device 20 and the ventilation device 110 are operated.

[0070] In the present embodiment, second temperature sensor 18 is disposed downstream of heat exchange element 13 in the air passage through which supply airflow AF2 passes.

[0071] This allows the ventilation system 101 to measure a temperature T2 that is close to the temperature of the supply airflow AF2 blown out into the indoor space S. Therefore, the ventilation system 101 can suppress the occurrence of condensation near the opening provided in the indoor space S for blowing out the supply airflow AF2.

[0072] Furthermore, in this embodiment, the ventilation device 110 has a third temperature sensor 119 that measures the temperature T3 of the supply airflow AF2. The third temperature sensor 119 is disposed upstream of the heat exchange element 13 in the air passage through which the supply airflow AF2 passes. When the fourth operation mode is being executed and the temperature comparison unit 135 determines that the temperature T3 of the supply airflow AF2 is lower than the dew-point temperature DP as a result of the comparison, the controller 130 stops the execution of the fourth operation mode and executes the first operation mode.

[0073] This allows the ventilation system 101 to measure the temperature T3 of the supply airflow AF2, which is close to the temperature of the supply airflow AF4. Therefore, the ventilation system 101 can reduce the possibility that condensation will occur near the opening, which is provided on the ceiling surface of the indoor space S and is used to blow the supply airflow AF4 into the indoor space S, and that the condensed water droplets will fall onto the floor of the indoor space S, causing discomfort to the occupants.

[0074] (Other embodiments) As described above, the first and second embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to these, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. Furthermore, it is also possible to combine the components described in the first and second embodiments to create new embodiments.

[0075] Therefore, other embodiments will be exemplified below.

[0076] The first temperature sensor 3 and the humidity sensor 4 are provided integrally with the controller 30, but this is not limiting. At least one of the first temperature sensor 3 and the humidity sensor 4 may be disposed in the indoor space S as a separate entity from the controller 30.

[0077] Although the ventilation device 110 is installed above the ceiling of the indoor space S, the present invention is not limited to this. The ventilation device 110 may also be installed under the floor of the indoor space S.

[0078] The exhaust device 20 may be a bathroom ventilation fan that exhausts air from the bathroom.

[0079] Although the air supply device 140 is installed above the ceiling of the indoor space S, the present invention is not limited to this. The air supply device 140 may also be installed under the floor of the indoor space S.

[0080] The space ventilated by the ventilation device 110 and the space exhausted by the exhaust device 20 may be separated by a door for accessing and exiting the respective spaces, or by a wall having an opening large enough to allow air to circulate between the spaces.

[0081] The ventilation system 1 and the ventilation system 101 may include an air purifier that collects dust and other particles contained in the air of the indoor space S and purifies the air of the indoor space S. The air purifier is disposed on the ceiling surface of the indoor space S. The air purifier has a sensor that measures the amount of dust and other particles contained in the air of the indoor space S. The sensor measures the amount of dust and other particles contained in the air per unit volume. When the controller 30 and the controller 130 determine that the amount of dust and other particles measured by the sensor exceeds a predetermined value, the controller 30 and the controller 130 may increase the operating output of the exhaust fan 11 and the intake fan 12 compared to before the controller 30 and the controller 130 determined that the amount of dust and other particles exceeded a predetermined value. This allows the ventilation system 1 and the ventilation system 101 to increase the ventilation rate (the number of times the air in the indoor space S is replaced per unit time) for the indoor space S compared to before the amount of dust and other particles contained in the air of the indoor space S exceeded the predetermined value. Therefore, the ventilation system 1 and the ventilation system 101 can maintain good air quality in the indoor space S.

[0082] It should be noted that the above-described embodiments are intended to illustrate the technology of the present disclosure, and various modifications, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents. [Industrial Applicability]

[0083] The present disclosure is applicable to ventilation systems in which negative pressure can be created in an indoor space when an exhaust device and a ventilation device are operated. [Explanation of symbols]

[0084] 1. Ventilation system 2a Duct 2b duct 2c Duct 3 First temperature sensor 4 Humidity Sensor 10. Ventilation equipment 11 Exhaust fan 12 Air supply fan 13 Heat exchange element 14 RA opening 15 EA opening 16 OA opening 17 SA opening 18 Second temperature sensor 20 Exhaust system 30 Controllers 31 Operation information receiving unit 32 Judgment section 33 Temperature and humidity information receiver 34 Dew point temperature calculation section 35 Temperature comparison section 36 Processing section 37 First operation control section 38 Second operation control section 101 Ventilation System 110 Ventilation equipment 119 Third temperature sensor 130 Controller 133 Temperature and humidity information receiver 135 Temperature comparison section 136 Processing section 139 Third operation control section 140 Air supply device AF1 Exhaust Flow AF2 intake air flow AF3 Exhaust Flow AF4 intake air flow S Indoor space

Claims

1. a ventilation device including an exhaust fan that generates an exhaust air flow that flows from an indoor space to an outdoor space and an intake air fan that generates an intake air flow that flows from the outdoor space to the indoor space; an exhaust device that exhausts air from the indoor space to the outdoor space; a first temperature sensor for measuring the temperature of the indoor space; a humidity sensor for measuring the humidity of the indoor space; a controller for controlling the operation of the ventilation device and the exhaust device; Equipped with The ventilation device includes: a heat exchange element for exchanging heat between the exhaust air flow and the intake air flow; a second temperature sensor for measuring the temperature of the supply airflow; The controller a determination unit that determines whether the exhaust device is in operation; a dew-point temperature calculation unit that calculates a dew-point temperature of the air in the indoor space based on the temperature of the indoor space measured by the first temperature sensor and the humidity of the indoor space measured by the humidity sensor; a temperature comparison unit that compares the dew-point temperature calculated by the dew-point temperature calculation unit with the temperature of the supply airflow measured by the second temperature sensor, When the determination unit determines that the exhaust device is not currently operating, a first operation mode is executed, the first operation mode including an operation of controlling the exhaust fan so that the exhaust flow has a first air volume and an operation of controlling the intake fan so that the intake flow has the first air volume; When the determination unit determines that the exhaust device is operating, a second operation mode is executed, the second operation mode including an operation of controlling the exhaust fan so that the exhaust flow becomes a second air volume smaller than the first air volume, and an operation of controlling the intake fan so that the intake flow becomes a third air volume larger than the first air volume, A ventilation system in which, when the second operating mode is being executed and the temperature comparison unit compares the temperature of the supply air flow to be lower than the dew point temperature, the second operating mode is stopped and the first operating mode is started.

2. The second temperature sensor The air intake device according to claim 1 , wherein the air intake device is disposed downstream of the heat exchange element in an air passage through which the intake air flows. Ventilation system.

3. a ventilation device including an exhaust fan that generates an exhaust air flow that flows from an indoor space to an outdoor space and an intake air fan that generates an intake air flow that flows from the outdoor space to the indoor space; an exhaust device that exhausts air from the indoor space to the outdoor space; an air supply device that supplies air from the outdoor space to the indoor space; a controller for controlling the operation of the ventilation device and the exhaust device, The controller a determination unit that determines whether the exhaust device is in operation, When the determination unit determines that the exhaust device is not currently operating, a first operation mode is executed, the first operation mode including an operation of controlling the exhaust fan so that the exhaust flow has a first air volume and an operation of controlling the intake fan so that the intake flow has the first air volume; When the determination unit determines that the exhaust device is in operation, a third operation mode is executed, the third operation mode including an operation of controlling the exhaust fan so that the exhaust flow becomes a second air volume smaller than the first air volume, an operation of controlling the intake fan so that the intake flow becomes a third air volume larger than the first air volume, and an operation of starting the operation of the intake device. Ventilation system.

4. a first temperature sensor for measuring the temperature of the indoor space; a humidity sensor that measures the humidity of the indoor space; The ventilation device includes: a heat exchange element for exchanging heat between the exhaust air flow and the intake air flow; a second temperature sensor for measuring the temperature of the supply airflow; The controller a dew-point temperature calculation unit that calculates a dew-point temperature of the air in the indoor space based on the temperature of the indoor space measured by the first temperature sensor and the humidity of the indoor space measured by the humidity sensor; a temperature comparison unit that compares the dew-point temperature calculated by the dew-point temperature calculation unit with the temperature of the supply airflow measured by the second temperature sensor, A ventilation system as described in claim 3, wherein when the third operating mode is being executed and the temperature comparison unit compares and finds that the temperature of the supply air flow is lower than the dew point temperature, the execution of the third operating mode is stopped and a fourth operating mode is executed, which includes an operation of controlling the operation of the exhaust blower so that the exhaust air flow becomes the first air volume, an operation of controlling the operation of the supply air blower so that the supply air flow becomes the first air volume, and an operation of continuing the operation of the supply air device.

5. The second temperature sensor The ventilation system according to claim 4 , wherein the ventilation system is disposed downstream of the heat exchange element in an air passage through which the supply air flows.

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