JP7360876B2 - Ventilation equipment and ventilation systems - Google Patents

Description

TECHNICAL FIELD The present invention relates to ventilation devices and ventilation systems.

Buildings with high indoor airtightness may be equipped with ventilation systems that ventilate the interior space throughout the day (24 hours). By installing such a ventilation system, it is possible to ventilate the air inside the building.Furthermore, if the ventilation system has a total heat exchange function, the air exhausted to the outside of the building and the air supplied to the inside of the building can be ventilated. Since heat exchange occurs between the air and the air, it is possible to save energy and improve comfort.
As a conventional example of such a ventilation device, for example, one disclosed in Patent Document 1 is known.

Patent Document 1 includes a supply air blower and an exhaust air blower driven by a motor, and each blower supplies and exhausts air into the house, and a heat exchanger exchanges heat between the supply air and the exhaust air. It is stated that the exchange will take place.

In Patent Document 1, the air volume is set in multiple stages of strength and weakness, the pressure loss of the air supply system and the exhaust system is calculated through a test run, and the air supply blower and the exhaust air blower are adjusted based on the calculation results. It is disclosed that a desired ventilation air volume can be obtained by setting the rotation speed of the engine.

Japanese Patent Application Publication No. 2010-190524

However, in Patent Document 1 mentioned above, only a plurality of levels of strength correspond to the air volume, and depending on the house, the ventilation air volume may be too small or too large. If the air volume is too low, there will be insufficient ventilation, making it impossible to obtain proper performance. Moreover, when the air volume becomes excessive, problems arise such as noise and unnecessary power consumption.

In addition, variations in the rotation speed may occur due to the characteristics of the motor used to drive each blower, so if you drive the supply air blower and the exhaust blower at the rotation speed set based on the pressure loss calculated from the trial run, There may be cases where it is not possible to obtain a ventilation air volume suitable for the house.

The present invention was made in order to solve the above problems, and its purpose is to provide a ventilation device and a ventilation system that can set the optimum supply air volume and exhaust air volume for each building. It is about providing.

In order to achieve the above object, a ventilation device according to the present invention provides an air supply flow path that includes an air supply fan that supplies outdoor air into a room, and a supply air flow rate sensor that detects the air supply air volume of the air supply fan. an exhaust flow path including an exhaust fan that exhausts indoor air to the outside, and an exhaust air volume sensor that detects the exhaust air volume of the exhaust fan; a heat exchanger that exchanges heat between the air supply fan and the exhaust fan; a non-volatile memory that stores the set supply air volume of the supply air flow path and the set exhaust air volume of the exhaust flow path based on input from the unit; and performing calculations to correct the set exhaust air volume to become an effective set supply air volume and an effective set exhaust air volume, respectively, and store the effective set supply air volume and the effective set exhaust air volume in the nonvolatile memory, The air supply fan is controlled so that the supply air volume becomes the effective set supply air volume, and the exhaust fan is controlled so that the exhaust air volume becomes the effective set exhaust air volume. .

A ventilation system according to the present invention includes a first ventilation device provided on a first floor, and a second ventilation device provided on a second floor higher than the first floor. The first ventilation device and the second ventilation device each include an air supply fan that supplies outdoor air into the room, and a supply air flow rate sensor that detects the air flow rate of the air supply fan. An exhaust flow path that includes an air supply flow path, an exhaust fan that exhausts indoor air to the outside, and an exhaust air volume sensor that detects the exhaust air volume of the exhaust fan, and heat between the air supply flow path and the exhaust flow path. a total heat exchanger that performs the exchange; a control device that controls the driving of the air supply fan and the exhaust fan; and an outside air temperature sensor that is provided near the outdoor air inlet of the air supply flow path and that detects the outside air temperature. A sensor, the control device includes an operation section through which an operator performs an input operation, a set supply air volume of the supply air flow path based on the input from the operation section, a set exhaust air volume of the exhaust flow path , a non-volatile memory that stores a first lower limit value of the outside air temperature , and controls the supply air fan so that the supply air volume is the set supply air volume , and the exhaust air volume is controlling the exhaust fan so as to achieve the set exhaust air volume, and further controlling the second ventilation device when the outside air temperature detected by the outside air temperature sensor is lower than the first lower limit; wherein the set intake air volume is not changed and the set exhaust air volume is reduced, and the control device of the first ventilation device is controlled to reduce the set intake air volume and the set exhaust air volume. , the temperature difference between the first floor and the second floor is eliminated in winter.

According to the present invention, after installing a ventilation system in a building, it is possible to set the supply air volume and exhaust air volume. Therefore, since the air volume can be set locally for each building, it is possible to set the supply air volume and exhaust air volume suitable for each building.

FIG. 1 is an explanatory diagram schematically showing how a ventilation system according to a first embodiment of the present invention is installed in a house. FIG. 2 is a flow diagram showing the configuration of the ventilation device according to the embodiment of the present invention. FIG. 3 is a block diagram showing the configuration of a control device of a ventilation system according to an embodiment of the present invention. FIG. 4 is an explanatory diagram showing changes between the normal mode and the setting mode. FIG. 5 is a flowchart showing the processing procedure for setting the air volume of the SA fan and EA fan. FIG. 6 is a flowchart showing the processing of each control mode and failure detection mode of the ventilation apparatus according to the present embodiment. FIG. 7 is a flowchart showing the processing procedure of standard mode control. FIG. 8 is a flowchart showing the processing procedure of positive pressure mode control. FIG. 9 is a flowchart showing the processing procedure of eco air volume mode control. FIG. 10 is a flowchart showing the processing procedure of maintenance mode and weak air volume mode control. FIG. 11 is a flowchart showing the processing procedure of failure detection control. FIG. 12 is an explanatory diagram showing the configuration of a residential ventilation system according to the second embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings.
[Configuration description of first embodiment]
FIG. 1 is a flow diagram showing the flow of air when a ventilation system according to a first embodiment of the present invention is installed in a house (building), and FIG. 2 is a flow diagram of the ventilation system. FIG. 3 is a block diagram showing the electrical configuration of the control device and its peripheral devices shown in FIG. 2.

As shown in FIG. 1, a ventilation system 1 is installed near a ceiling 101 of a house 100. The ventilation device 1 takes in outdoor air (OA) and supplies it into the house 100 via the filter 2, the total heat exchanger 11, and the duct 111a. FIG. 1 shows a configuration in which air is supplied into two living rooms 102 as an example.

Further, the ventilation device 1 takes in indoor air (RA; return air) from the house 100 and discharges it to the outside of the house 100 via the duct 111b and the total heat exchanger 11. FIG. 1 shows, as an example, a configuration in which air is taken in from a hallway 103 of a house 100 and discharged to the outside.

As shown in FIG. 2, the ventilation system 1 includes a first inlet Q1 that introduces outdoor air (OA), and a first inlet Q1 that supplies air (SA; Supply Air) that has passed through a total heat exchanger 11 into the house 100. It is provided with a discharge port Q2, a second introduction port Q3 for introducing indoor air (RA), and a second discharge port Q4 for discharging the air (EA; Exhaust Air) that has passed through the total heat exchanger 11 to the outside. In FIG. 2, a flow path from the first inlet Q1 to the first discharge port Q2 is defined as an air supply flow path P1, and a flow path from the second inlet Q3 to the second discharge port Q4 is defined as an exhaust flow path P2. The filter 2 for removing dust shown in FIG. 1 is provided upstream of the first introduction port Q1.

The ventilation system 1 further includes an SA fan F1 (air supply fan), an EA fan F2 (exhaust fan), a total heat exchanger 11 (heat exchanger), and a control device 21.

The SA fan F1 is provided in the air supply flow path P1, and the output side of the SA fan F1 is connected to the first discharge port Q2 via the total heat exchanger 11. Further, an outside air temperature sensor 14 that measures the outside air temperature and an air supply wind speed sensor 12 that measures the wind speed of the air introduced into the air supply path P1 are provided near the outdoor air inlet of the air supply path P1. There is.

The EA fan F2 is provided in the exhaust flow path P2, and the input side of the EA fan F2 is connected to the total heat exchanger 11, and the output side is connected to the second discharge port Q4. Further, an indoor temperature sensor 15 for measuring the indoor temperature is provided near the indoor air inlet of the exhaust flow path P2, and an indoor temperature sensor 15 for measuring the indoor air temperature is provided near the outlet of the exhaust flow path P2. An exhaust air speed sensor 13 is provided to measure the wind speed of the exhausted air.

The supply air speed sensor 12 and the exhaust air speed sensor 13 are, for example, propeller type sensors, and measure the wind speed of the air flowing through the flow path based on the rotation speed of the propeller. Furthermore, the air volume is calculated based on the cross-sectional area of the duct through which the air flows. That is, the air supply air velocity sensor 12 has a function as an air supply air volume sensor that measures the air volume supplied into the house 100. Furthermore, the exhaust air speed sensor 13 has a function as an exhaust air volume sensor that measures the volume of exhaust air discharged from the inside of the house 100 to the outside. Note that the installation positions of the wind speed sensors 12 and 13 are shown as an example, and they may be installed at other locations as long as they are within the flow path. Furthermore, hereinafter, the supply air volume and the exhaust air volume may be collectively referred to as the ventilation air volume.

The total heat exchanger 11 performs heat exchange to exchange latent heat and sensible heat between the air flowing through the air supply flow path P1 and the air flowing through the exhaust flow path P2. Therefore, when the outdoor air temperature is lower than the indoor air temperature, for example in winter, the air flowing into the supply air flow path P1 is heated by taking heat from the air flowing through the exhaust air flow path P2. The air is then humidified and supplied into the living room 102 through the first outlet Q2.

On the other hand, when the outdoor air temperature is higher than the indoor air temperature, for example in the summer, the air flowing into the supply air flow path P1 releases heat to the air flowing through the exhaust air flow path P2, and the temperature is lowered. It is dehumidified and discharged into the living room 102 through the first discharge port Q2.

As shown in FIG. 3, the control device 21 controls an SA fan motor 25 (air supply fan motor) and an EA fan motor 26 (exhaust fan motor) that drive the SA fan F1 and EA fan F2 described above, and each fan motor. It includes a motor driver 24 that controls driving of the motors 25 and 26, and a power supply circuit 27. Each of the fan motors 25 and 26 is, for example, a DC brushless motor, and is a motor whose rotation speed can be controlled to an arbitrary value (desired rotation speed).

The power supply circuit 27 supplies instrumentation power for operating the control device 21 and motive power for driving each fan motor 25 and 26.

The control device 21 further includes a control circuit 22 and a handheld controller 23 that performs various setting operations.

The control circuit 22 is composed of, for example, an electronic board, and includes a control section 31 that controls the ventilation device 1 in general, a storage section 32, an operation input/output section 33, an input section 34, and an output section 35. . For example, the control circuit 22 controls the rotation of the SA fan motor 25 and the EA fan motor 26 based on the temperature and wind speed detected by the outside air temperature sensor 14, the indoor temperature sensor 15, the air supply wind speed sensor 12, and the exhaust air speed sensor 13. Outputs a command signal to control the number.

The storage unit 32 stores various programs and calculation data required for calculation processing by the control unit 31, and various data related to driving the SA fan F1 and the EA fan F2. Furthermore, the storage unit 32 includes a nonvolatile memory 32a that retains data even when the power is turned off, and stores an air volume setting value, a ratio for reducing the air volume, etc., which will be described later.

The operation input/output unit 33 transmits and receives data to and from the handheld controller 23.

The input unit 34 inputs various data detected by the outside air temperature sensor 14, the indoor temperature sensor 15, the air supply wind speed sensor 12, and the exhaust air speed sensor 13. Further, data on the number of rotations of each fan motor 25 and 26 is inputted from the motor driver 24 .

The output unit 35 outputs a command signal for the rotation speed of the SA fan motor 25 and the EA fan motor 26 to the motor driver 24 .

The handheld controller 23 is installed, for example, at a location where it can be easily operated by the user. The handheld controller 23 is connected to the control circuit 22 by wire or wirelessly. The hand controller 23 includes a microcomputer 41 (for example, a one-chip microcomputer) that performs arithmetic processing and communicates with the operation input/output unit 33, an operation unit 43 that performs various input operations by the operator, and a control unit 43 that performs various types of information. It is equipped with a display section 42 that displays.

The operation unit 43 includes an operator (not shown) for setting the air volume of the air supply fan F1 and the exhaust fan F2, and operating the drive and stop operations. The air volume setting for each of the fans F1 and F2 can be input in units of 1 [m3/h]. That is, it is possible to set a small air volume. Further, the operation unit 43 includes an operator (not shown) for setting various control modes of the ventilation device 1. Details of the control mode will be described later.

The display unit 42 displays the current driving status of the air supply fan F1 and exhaust fan F2, air volume or motor rotation speed, current operation mode, preliminary failure detection, filter clogging, and the like. The display section 42 is, for example, a liquid crystal display. Note that it is also possible to configure a touch panel sensor that serves both the operation section 43 and the display section 42.

Note that a user terminal connected to a network may be used instead of the handheld controller 23.

Next, each operation mode set in the ventilation system 1 will be explained. The operation mode can be roughly divided into a "normal mode" and a "setting mode."

As the normal mode, standard mode, positive pressure mode, eco air volume mode, maintenance mode, and weak air volume mode can be set. Details will be described later.

In the setting mode, during a completion test after installing the ventilation system 1, etc., the set air volume of the SA fan F1 (set air supply air volume) and the set air volume of the EA fan F2 (set exhaust air volume) are stored in the nonvolatile memory 32a. Performs processing to write to. Here, the set supply air volume and the set exhaust air volume need to be the effective set supply air volume and the effective set exhaust air volume, respectively. The effective set air supply air volume and the effective set exhaust air volume are mechanical ventilation volumes that satisfy the required ventilation volume for each residence as required by law. The required ventilation amount is the value obtained by multiplying the air volume of each residence by the required number of ventilation stipulated by law for each type of building, and is calculated in advance when designing the residence.

Then, the operator inputs this value of the required ventilation amount into the operation unit as the value of the set air volume. The storage unit 32 stores sensor error values assuming the effective ventilation rate and the detection error of the airflow sensor, which are preset for each ventilation device. An operation is performed in which the effective ventilation rate stored in the storage unit 32 is divided and further a sensor error value is added. The correction value obtained by this calculation is the mechanical ventilation amount, and the storage unit 32 performs a process of writing the mechanical ventilation amount into the nonvolatile memory 32a as the actual set air supply air volume and set exhaust air volume used for various controls.

For example, in the case of a house with a volume of 200 m3, the required ventilation frequency of the house is 0.5 [times/h], so the required ventilation amount is 100 [m3/h]. The operator inputs a value of 100 into the operation unit 43 as the set air volume. In reality, in order to secure the required ventilation amount of 100 [m3/h], a mechanical ventilation amount greater than this is required. The resistance value to supply air to the room differs depending on the type of ventilation device, and the effective ventilation rate is stored depending on the type of ventilation device. Additionally, sensor error values are also stored that take into consideration errors that the air volume sensor may not necessarily be able to accurately detect. When the effective ventilation rate is 97% and the sensor error value is 1 [m3/h], the mechanical ventilation amount is 105 [m3/h]. The storage unit 32 stores the value of 105 [m3/h] as a set air supply air volume and a set exhaust air volume, and the set air volume is used for various controls.

Note that the value for which the operation unit 43 accepts input may be only the volume value. In this case, it is assumed that the required ventilation frequency is further stored in the storage unit 32 in advance, and the required ventilation amount is also calculated by the control unit. Further, it may be possible to input and set an arbitrary required number of ventilations from the operation section.

Furthermore, processing is performed to write the rotational speeds of the SA fan motor 25 and the EA fan motor 26 into the nonvolatile memory 32a. In addition, settings such as the ratio of the ventilation air volume in the positive pressure mode and eco air volume mode to the ventilation air volume in the standard mode (what percentage should be reduced) are input.

Hereinafter, "1. Standard mode", "2. Positive pressure mode", "3. Eco air volume mode", "4. Maintenance mode", "5. Weak air volume mode", Details of each mode, and "6. Wind speed sensor failure detection function" and "7. Filter maintenance time display function" provided in the ventilation system 1 will be explained.

<1. Standard mode>
The standard mode is a mode in which the SA fan F1 and the EA fan F2 are driven at the same time, and air is supplied and exhausted at the same time. The air volume of the air supply flow path P1 and the exhaust flow path P2 calculated from the wind speed detected by the air supply air speed sensor 12 and the exhaust air speed sensor 13 is a reference setting air volume that is set in advance (a reference setting air volume stored in the nonvolatile memory 32a). The rotation speeds of the SA fan motor 25 and the EA fan motor 26 are controlled so that. In other words, the rotation speed of each fan motor 25, 26 is controlled so as to reach the reference setting air volume set in the setting mode.

Therefore, even if the filter becomes clogged due to changes over time due to long-term use, ventilation can always be performed at the standard set air volume. In addition, since the rotation speeds of the SA fan F1 and the EA fan F2 can be controlled independently, even if an imbalance in air flow occurs between the air supply flow path P1 and the exhaust flow path P2, this can be resolved. This allows for stable air supply and exhaust. That is, in conventional ventilation systems, one motor drives the air supply and exhaust fans, so it is not possible to change the two air volumes individually, but in the ventilation system 1 according to the present embodiment, the air supply and exhaust fans cannot be changed individually. It is possible to change the air volume for air and exhaust separately.

In addition, in conventional ventilation systems, the air volume of the SA fan F1 and EA fan F2 is set when shipped from the factory or when installed in a house, so the settings cannot be changed after the ventilation system 1 is installed in a house. Can not. For example, when constructing a house, a trial run is performed by setting the air volume of the SA fan F1 and the EA fan F2 using a dip switch or the like provided in the ventilation system. At this time, the set air volume cannot be set lower than the desired air volume, so the air volume must be set to be larger than the set air volume.

In the ventilation device 1 according to the present embodiment, the air volume of the SA fan F1 and the EA fan F2 can be set in the nonvolatile memory 32a. Since the nonvolatile memory 32a can store and store a large amount of information, the air volume can be set in small units (for example, 1 [m3/h]) using the handheld controller 23 during construction of a house.

For example, in a trial run performed during construction of the ventilation system 1, first the air volume designed for the house is input to the control circuit 22, and each fan motor 25, 26 is controlled to achieve that air volume. Next, when sufficient time has elapsed and each fan F1, F2 reaches the set air volume, a setting operation is performed to write the rotational speed of each fan motor 25, 26 as a reference rotational speed in the nonvolatile memory 32a. Once the air volume is set, each of the fans F1 and F2 is controlled to maintain the set air volume even after the power is turned on, even if the power is cut off or the power is turned off. Since the set air volume can be set in small units, unnecessary air volume and static pressure are not increased, power consumption can be reduced, and noise can be reduced. Further, even after the ventilation system 1 is installed in a house, the air volume standard can be set, so even if changes occur over time, the air volume can be set to an appropriate level.

<2. Positive pressure mode>
In the positive pressure mode, the air volume by the supply fan F1 is set to the set air volume set in the setting mode, and the air volume by the exhaust fan F2 is set to a lower air volume than the standard set air volume (for example, 80% of the setting) to create positive pressure in the house. mode. The difference in air volume creates positive pressure inside the house, which prevents pollen and PM2.5 (fine particulate matter) from entering the house through gaps in windows and doors, and is a countermeasure against hay fever and PM2.5. can do.

<3. Eco air volume mode>
The eco air volume mode is a mode that reduces power consumption by reducing the ventilation air volume when it is determined that the natural ventilation volume is large. For example, in winter, the difference between indoor temperature and outdoor temperature increases, and air flows in and out of the house due to gaps in the house. That is, the amount of natural ventilation increases. Therefore, even if the amount of air supplied and exhausted by the ventilation device 1 is reduced, the inside of the house can be sufficiently ventilated.

Therefore, in the eco air volume mode, a lower limit value of the outdoor temperature (first lower limit value; for example, 10 degrees Celsius) and a threshold value (for example, 10 degrees) of the difference between the indoor temperature and the outdoor temperature are set, and the temperature is measured by the outdoor air temperature sensor 14. If the outdoor temperature is below 10 degrees Celsius, and the difference between the outdoor temperature measured by the outdoor temperature sensor 14 and the indoor temperature measured by the indoor temperature sensor 15 is 10 degrees or more, it is determined that it is winter. do. Alternatively, it may be determined that it is winter based only on the lower limit of the outdoor temperature or only on the threshold of the difference between the outdoor temperature and the indoor temperature.

Then, the set air volume of both the SA fan F1 and the EA fan F2 is reduced by a predetermined ratio. For example, the air volume is reduced by 20% and set to 80% of the set air volume. The above ratio (20%) can be set, for example, at the time of setting, and the set value is stored in the nonvolatile memory 32a.

Further, it is also possible to simultaneously execute the positive pressure mode and the eco air volume mode described above. In this case, the air volume of the EA fan F2 is, for example, 64% (80%×80%=64%) of the set air volume. Note that the lower limit value (first lower limit value) of the outdoor temperature is not limited to 10°C, and can be set to a temperature other than 10°C.

<4. Maintenance mode>
The maintenance mode is a mode in which the air volume is set to be weak in order to prevent dew condensation and freezing of the total heat exchanger 11. For example, during the winter in cold regions, the outdoor temperature may be extremely low. In such a case, if low-temperature outside air, for example, outside air below freezing point 15°C (second lower limit), is directly taken into the air supply flow path P1, condensation may occur inside the total heat exchanger 11, or Problems such as the total heat exchanger 11 freezing occur. Therefore, the SA fan motor 25 is rotated at the minimum number of rotations (a predetermined number of rotations; for example, 400 [rpm]) that can maintain rotation, and the EA fan motor 26 is controlled to have the normal set air volume.

<5. Low airflow mode＞
The weak air volume mode is a mode in which the air volume is reduced instead of stopping the operation in order to prevent dew condensation in the ventilation route. For example, although it is originally desirable to operate the ventilation device 1 continuously for 24 hours, the user may stop the ventilation device 1 due to the coldness of the ventilation in winter. When the ventilation system stops, the hot and humid air inside the house flows back into the ventilation path and is cooled by the outside air, which can cause condensation in the ventilation path. Furthermore, since there is almost no air movement within the ventilation path, there is a risk of mold and the like forming. For this reason, both the SA fan motor 25 and the EA fan motor 26 are rotated at the minimum rotation speed (predetermined rotation speed; for example, 400 [rpm]; the same rotation speed as the minimum rotation speed in the maintenance mode described above). By rotating the air conditioner (not necessarily the same), it is possible to prevent condensation and mold from forming in the ventilation path without making the user feel the coldness of the ventilation in winter. This operation is performed from the handheld controller 23.

<6. Wind speed sensor failure detection function>
The wind speed sensor failure detection function is a function that notifies the user when the detected value of the wind speed sensor (supply air speed sensor 12, exhaust air speed sensor 13) for calculating the supply air volume or exhaust air volume is abnormal. If the detected values of the supply air speed sensor 12 and the exhaust air speed sensor 13 shown in Fig. 2 become abnormal and a malfunction occurs that outputs a value higher than the actual wind speed, it is determined that the air volume is excessive and each The rotation speeds of the fan motors 25 and 26 are controlled to decrease.

This results in insufficient air volume. In order to prevent such problems from occurring, record the reference rotation speed under normal operating conditions during construction, and ensure that the rotation of SA fan F1 or EA fan F2 continues for a predetermined period of time (for example, 72 hours) or more. If the number of rotations is less than the reference number of rotations, it is determined that a failure has occurred in either of the wind speed sensors 12, 13. Then, an alarm indicating the occurrence of a failure is displayed on the display unit 42 of the handheld controller 23. The user can recognize that an abnormality has occurred in each of the wind speed sensors 12 and 13, and can request repair and inspection. As a result, insufficient air volume due to sensor abnormality can be prevented.

<7. Filter maintenance time display function>
If the filter 2 that removes dust contained in the outside air is clogged, the filter maintenance timing display function detects the occurrence of the clog before the function of the filter 2 deteriorates due to clogging. This is a function to notify the maintenance time of the filter 2.

As shown in FIG. 2, the air supply flow path P1 of the ventilation device 1 according to this embodiment is provided with a filter 2 for removing dust contained in the outside air. As the filter 2 becomes increasingly clogged, the amount of air supplied from the air supply path P1 decreases, so the rotation speed of the SA fan motor 25 is controlled to increase so as to maintain the amount of air constant. Therefore, when the rotation speed of the SA fan motor 25 exceeds a preset threshold, it is determined that the filter 2 is clogged, and a warning is displayed to the user.

At this time, the resistance of the ventilation path through which air flows differs depending on the building in which the ventilation device 1 is installed. That is, the number of revolutions used as a criterion for determining clogging differs for each building. In this embodiment, the rotation speed threshold (upper limit rotation speed) for determining clogging for each building is set based on the reference rotation speed for each building (for example, the reference rotation speed + 150 rotations, etc.), and the non-volatile The information is stored in the gender memory 32a. Therefore, it is possible to determine whether the filter 2 is clogged based on the threshold value set for each building, and it is possible to accurately notify the filter replacement time. That is, it is possible to prevent the filter 2 from being replaced sooner than necessary or from continuing to use it until it becomes completely clogged.

[Description of the operation of the first embodiment]
Next, processing operations of the ventilation apparatus 1 according to the first embodiment configured as described above will be explained with reference to FIGS. 4 to 11.

FIG. 4 is an explanatory diagram showing the state transition of the handheld controller 23. This shows that the normal mode and the setting mode are alternately switched by performing a mode change operation (for example, pressing a mode change key, not shown) using the operation unit 43 provided on the handheld controller 23. That is, if a mode change operation is performed in the normal mode, the mode is switched to the setting mode, and if a mode change operation is performed in the setting mode, the mode is switched to the setting mode.

FIG. 5 is a flowchart showing the operating procedure when the setting mode is selected, and the operating procedure when the setting mode is selected will be described below with reference to FIG. Note that the process shown in FIG. 5 is performed, for example, at the time of a completion test when the ventilation device 1 is installed in the house 100. Further, the processing of each step shown in FIG. 5 is executed by the control unit 31 shown in FIG. 2.

First, in step S11, the control unit 31 sets the air volume of the SA fan F1.

In step S12, the control unit 31 performs a process of storing the reference air volume of the SA fan F1 in the nonvolatile memory 32a. This process is performed by the operator's input from the operation unit 43 of the handheld controller 23. Based on this input and calculation by the control unit 31, the reference air volume is set.

In step S13, the control unit 31 sets the air volume of the EA fan F2.

In step S14, the control unit 31 performs a process of storing the reference setting air volume of the EA fan F2 in the nonvolatile memory 32a. This process is performed by the operator's input from the operation unit 43 of the handheld controller 23. Based on this input and calculation by the control unit 31, the reference air volume is set.

In step S15, the control unit 31 sets the standard set air volume of the SA fan F1 to the set air volume of the SA fan F1. Further, the standard set air volume of the EA fan F2 is set as the set air volume of the EA fan F2.

In step S16, the control unit 31 operates the ventilation device 1 in a standard mode (details will be described later) in which the air volume is constant.

In step S17, the control unit 31 determines whether the actual air volume of the SA fan F1, that is, the air volume calculated based on the wind speed detected by the air supply wind speed sensor 12, and the set air volume of the SA fan F1 match. to decide. If they do not match, the process returns to step S16. If they match, the process advances to step S18.

In step S18, the control unit 31 writes the rotation speed of the SA fan motor 25 into the nonvolatile memory 32a as the reference rotation speed.

In step S19, the control unit 31 operates the ventilation device 1 in a standard mode with a constant air volume.

In step S20, the control unit 31 determines whether the actual air volume of the EA fan F2, that is, the air volume calculated based on the wind speed detected by the exhaust air speed sensor 13, matches the set air volume of the EA fan F2. do. If they do not match, the process returns to step S19. If they match, the process advances to step S21.

In step S21, the control unit 31 writes the rotation speed of the EA fan motor 26 as the reference rotation speed in the nonvolatile memory 32a.

In this way, in the setting mode, the standard setting air volume of the SA fan F1 and the EA fan F1 suitable for the ventilation system 1 installed in each house, and the standard rotation speed of the SA fan motor 25 and the EA fan motor F2 are stored in the nonvolatile memory 32a. can be written to.

FIG. 6 is a flowchart showing a process for selecting various types of control in the normal mode. The process of selecting various types of control will be described below with reference to the flowchart shown in FIG.

If the standard mode is set on the operation unit 43, the control unit 31 performs standard mode control in step S31.

If the positive pressure mode is set on the operation unit 43, the control unit 31 performs positive pressure mode control in step S32.

If the eco air volume mode is set on the operation unit 43, the control unit 31 performs eco air volume mode control in step S33.

When the maintenance mode or the weak air volume mode is set on the operation unit 43, the control unit 31 implements the maintenance mode or the weak air volume mode control in step S34.

When the failure detection control is set in the operation unit 43, in step S35, the control unit 31 performs control to detect failure of the wind speed sensor and notify the maintenance time of the filter.

Next, the standard mode control processing procedure will be described with reference to the flowchart shown in FIG. First, in step S<b>41 , the control unit 31 obtains the rotational speed detected by the intake air speed sensor 12 and the exhaust air speed sensor 13 .

In step S42, the control unit 31 calculates the actual air volume of supply air and exhaust air based on the rotational speed detected by each wind speed sensor 12, 13. The air supply and exhaust speeds can be detected based on the rotational speed of each wind speed sensor 12 and 13, and the actual air volume can be calculated based on the cross-sectional area of the duct through which the air flows.

In step S43, the control unit 31 compares the actual air volume of the air supply and the set air volume of the air supply. If the actual air volume is large, the process advances to step S44, if the actual air volume is small, the process advances to step S45, and if the actual air volume and the set air volume match, the process advances to step S46. .

In step S44, the control unit 31 reduces the rotation speed of the SA fan motor 25. That is, since the actual air volume is larger than the set air volume, the rotation speed of the SA fan motor 25 is reduced to control the actual air volume to approach the set air volume. Thereafter, the process advances to step S46.

In step S45, the control unit 31 increases the rotation speed of the SA fan motor 25. That is, since the actual air volume is smaller than the set air volume, the rotation speed of the SA fan motor 25 is increased to control the actual air volume to approach the set air volume.

In step S46, the control unit 31 compares the actual exhaust air volume and the set exhaust air volume. If the actual air volume is large, the process advances to step S47; if the actual air volume is small, the process advances to step S48; if the actual air volume and the set air volume match, the process ends.

In step S47, the control unit 31 reduces the rotation speed of the EA fan motor 26. That is, since the actual air volume is larger than the set air volume, the rotational speed of the EA fan motor 26 is reduced to control the actual air volume to approach the set air volume. After that, this process ends.

In step S48, the control unit 31 increases the rotation speed of the EA fan motor 26. That is, since the actual air volume is smaller than the set air volume, the rotation speed of the EA fan motor 26 is increased to control the actual air volume to approach the set air volume. After that, this process ends.

In this way, in the standard mode, the air volume by the SA fan F1 and the air volume by the EA fan F2 are controlled so that they each reach the set air volume. It becomes possible to ventilate the air.

Next, the processing procedure in the positive pressure mode will be described with reference to the flowchart shown in FIG.

First, in step S51, the control unit 31 determines whether an operation to switch the positive pressure mode from off to on has been performed on the operation unit 43 of the handheld controller 23. If the positive pressure mode is turned on, the process moves to step S52, and if it is not turned on, the process moves to step S53.

In step S52, the set air volume of the EA fan F1 is changed to 80%. That is, the set air volume is reduced by 20%.

In step S53, the control unit 31 determines whether an operation to switch the positive pressure mode from on to off has been performed on the operation unit 43 of the handheld controller 23. If the positive pressure mode is turned off, the process moves to step S54, and if it is not turned off, the process ends.

In step S54, the set air volume of the EA fan F1 is changed to the set air volume before the change. That is, control is performed to return the set air volume to 100%.

In this way, in the positive pressure mode, the air supplied into the house is controlled to be larger than the air exhausted from the house to the outside, thereby maintaining the inside of the house at a positive pressure. Therefore, it is possible to prevent pollen and PM2.5 from entering the house.

Next, the processing procedure of the eco air volume mode will be described with reference to the flowchart shown in FIG.
First, in step S61, the control unit 31 acquires the outdoor temperature detected by the outdoor temperature sensor 14 and the indoor temperature detected by the indoor temperature sensor 15.

In step S62, the control unit 31 determines whether the outdoor temperature is 10 degrees Celsius or less and/or the difference between the outdoor temperature and the indoor temperature is 10 degrees or more. If the difference between the outdoor temperature and the indoor temperature is 10°C or less and/or the difference between the outdoor temperature and the indoor temperature is 10deg or more, the process advances to step S63, and if the difference is 10°C or less and/or the outdoor temperature and the indoor temperature is not 10deg or more, The process advances to step S65.

In step S63, the control unit 31 determines whether the outdoor temperature was 10 degrees Celsius or less and/or the difference between the outdoor temperature and the indoor temperature was 10 degrees or more during the previous measurement. If the temperature is 10 degrees Celsius or less and/or the difference between the outdoor temperature and the indoor temperature is 10 degrees or more, this process ends. If the difference between the outdoor temperature and the indoor temperature is not 10 deg or more and/or the difference between the outdoor temperature and the indoor temperature is not 10 deg or more, the process advances to step S64.

In step S64, the control unit 31 reduces the set air volume of the SA fan F1 and the EA fan F2 to 80%. After that, this process ends.

In step S65, the control unit 31 returns the set air volume of the SA fan F1 and the EA fan F2 to the set air volume before the change. After that, this process ends.

As described above, in the eco air volume mode, when the outdoor temperature becomes 10 degrees Celsius or less, or when the temperature difference between the indoor temperature and the outdoor temperature becomes 10 degrees or more, the ventilation air volume is reduced to 80%. That is, when the outdoor temperature is low and the amount of natural ventilation increases due to opening and closing of the door of the house, it is possible to reduce power consumption by reducing the air volume by the SA fan F1 and the EA fan F2. Become.

Next, with reference to the flowchart shown in FIG. 10, processing procedures in the maintenance mode and the weak air volume mode will be described.
First, in step S71, the control unit 31 acquires the outdoor temperature measured by the outdoor temperature sensor 14.

In step S72, the control unit 31 determines whether the outdoor temperature is below freezing 15°C (-15°C). If the temperature is below -15° C., the process proceeds to step S75; otherwise, the process proceeds to step S73.

In step S73, the control unit 31 determines whether or not there is an operation input for the weak air volume mode on the operation unit 43. If it is determined that the user has set the weak air volume mode using the operation unit 43 and there is an operation input, the process proceeds to step S76; otherwise, the process proceeds to step S74.

In step S74, the control unit 31 controls the SA fan F1 and the EA fan F2 to reach the set air volume.

In step S75, the control unit 31 sets the rotation speed of the SA fan motor 25 to 400 [rpm], which is the minimum rotation speed.

In step 76, the control unit 31 sets the rotation speeds of the SA fan motor 25 and the EA fan motor 26 to 400 [rpm], which is the minimum rotation speed. After that, this process ends.

In this way, in the maintenance mode, when the outdoor temperature is extremely low, the SA fan F1 is driven at the minimum rotation speed to prevent the total heat exchanger 11 from condensing or freezing.

In addition, in the weak air volume mode, the user operates the handheld controller 23 to drive the SA fan F1 and the EA fan F2 at the minimum rotation speed, so that the user does not feel the coldness of ventilation in winter. Prevents condensation and mold from forming inside the duct.

Next, the processing procedure of failure detection control will be described with reference to the flowchart shown in FIG. First, in step S81, the control unit 31 measures the rotation speeds of the SA fan motor 25 and the EA fan motor 26.

In step S82, the control unit 31 determines whether the rotation speed of the SA fan motor 25 is lower than the reference rotation speed. If the rotation speed is lower than the reference rotation speed, the process proceeds to step S83; otherwise, the process proceeds to step S85.

In step S83, it is determined whether 72 hours or more have passed since the rotation speed of the SA fan motor 25 decreased. If 72 hours have elapsed, the process advances to step S84; otherwise, the process advances to step S85.

In step S84, the control unit 31 displays on the display unit 42 that an abnormality has occurred in the air supply wind speed sensor 12, and notifies the user of the occurrence of the abnormality. Thereafter, the process advances to step S85.

In step S85, the control unit 31 determines whether the rotation speed of the EA fan motor 26 is lower than the reference rotation speed. If the rotation speed is lower than the reference rotation speed, the process proceeds to step S86; otherwise, the process proceeds to step S88.

In step S86, it is determined whether 72 hours or more have passed since the rotation speed of the EA fan motor 26 decreased. If 72 hours have elapsed, the process advances to step S87; otherwise, the process advances to step S88.

In step S87, the control unit 31 displays on the display unit 42 that an abnormality has occurred in the exhaust air velocity sensor 13, and notifies the user of the occurrence of the abnormality. Thereafter, the process advances to step S88.

In step S88, the control unit 31 adds a desired rotation speed (for example, 150 [rpm]) to the set rotation speed of the SA fan motor 25 to obtain a threshold rotation speed.

In step S89, the control unit 31 determines whether the rotation speed of the SA fan motor 25 exceeds the threshold rotation speed. If the threshold rotation speed is exceeded, the process proceeds to step S90, otherwise the process ends.

In step S90, the control unit 31 displays a warning on the display unit 42 indicating that maintenance of the filter 2 is required. After that, this process ends.

In this way, in the failure detection control, when the supply air speed sensor 12 and the exhaust air speed sensor 13 tend to fail, the user is notified of the abnormality in the supply air speed sensor 12 and the exhaust air speed sensor 13 before the failure occurs completely. I can let you know. Furthermore, if the filter 2 tends to become clogged, an alarm prompting the user to replace the filter 2 can be sent to the user before the filter 2 becomes completely clogged. Therefore, the user can repair and inspect the wind speed sensor and replace the filter 2 at an early stage.

[Description of effects of the first embodiment]
As explained above, the ventilation device 1 according to the first embodiment can achieve the following effects.
(1) Since the set air volume of each fan F1, F2 can be written in the nonvolatile memory 32a by operating the handheld controller 23, there is no need to write the set air volume at the time of shipment from the factory, and construction management is facilitated.

(2) Since the set air volume of each fan F1 and F2 can be finely set for each house in units of 1 [m3/h], overventilation can be prevented. Furthermore, energy saving can be improved. Furthermore, since air supply noise is reduced, the living environment can be improved.

(3) By setting the positive pressure mode, it is possible to maintain positive pressure inside the living room of the house, preventing pollen, PM2.5, dust, etc. from entering the room, improving the living environment. be able to.

(4) By setting the eco air volume mode, the ventilation air volume can be reduced in winter. Therefore, it is possible to prevent overventilation and improve energy saving.

(5) By setting the maintenance mode, the rotation speed of the fan motor 25 is reduced to the minimum rotation speed (for example, 400 [rpm]) to maintain operation during extreme cold, so that no condensation occurs inside the total heat exchanger. This prevents the product from becoming wet or freezing.

(6) By setting the low air volume mode, the rotation speed of each fan motor 25, 26 is lowered to the minimum rotation speed (for example, 400 [rpm]) and the operation is maintained, so the user can avoid ventilation during winter. Prevents condensation and mold from forming inside the duct without making you feel cold.

(7) By performing failure detection control, each wind speed sensor 12, 13 can be preliminarily detected before it breaks down, so repairs can be carried out before each wind speed sensor 12, 13 breaks down and stops functioning. becomes possible.

(8) Furthermore, by performing failure detection control, it is detected that the filter 2 is prone to clogging before it becomes completely clogged, and this is notified on the display unit 42. can be replaced.

[Description of second embodiment]
Next, a second embodiment of the present invention will be described. In the second embodiment, the ventilation device 1 described in the first embodiment is installed on multiple floors of a house to ventilate the inside of the house. That is, the second embodiment is a ventilation system equipped with two ventilation devices.

FIG. 12 is a flow diagram showing the flow of air when a ventilation system consisting of two ventilation devices 1a and 1b is installed in a house, and FIG. 2 is a flow diagram of the ventilation device. Note that although FIG. 12 will be described using a two-story house 201 as an example, the present invention can also be applied to a three-story house or more.

As shown in FIG. 12, a ventilation system 1b (first ventilation system) is provided on the first floor (first floor) of the house 201. Air taken in from outside is supplied into the first floor living room 202 via the filter 2b, the ventilation device 1b, and the duct 211a. Moreover, the air in the living room 202 on the first floor is supplied to the ventilation device 1b via the duct 211b, and after passing through the ventilation device 1b, is exhausted to the outside.

Further, a ventilation device 1a (second ventilation device) is provided on the second floor of the residence 201 (a second floor higher than the first floor). Air taken in from outside is supplied into the living room 203 on the second floor via the filter 2a, the ventilation device 1a, and the duct 211a. Moreover, the air in the living room 202 on the first floor is supplied to the ventilation device 1b via the duct 211b, and after passing through the ventilation device 1b, is exhausted to the outside.

In addition, a hallway/stairway 204 is provided for moving and ascending/descending between the first floor living room 202 and the second floor living room 203. Air is allowed to flow between them.

The configurations of each ventilation device 1a, 1b and filters 2a, 2b are similar to the ventilation device 1 shown in the first embodiment described above.
In the second embodiment, when the outdoor temperature falls below the lower limit value (for example, 10 degrees Celsius), the ventilation device 1b installed on the first floor is subjected to the processing shown in "3. Eco air volume mode" described above. Implement. That is, the set air volume of both the SA fan F1 and the EA fan F2 is reduced by a predetermined ratio with respect to the normal air volume. For example, the air volume is reduced by 20% and set to 80% of the normal air volume.

On the other hand, regarding the ventilation device 1a installed on the second floor, the set air volume of the SA fan F1 is not changed and is set to the normal air volume. Further, the set air volume of the EA fan F2 is reduced by 20% and set to 80% of the normal air volume.

That is, in a two-story house, warm air from heating tends to stay on the second floor through the hallways and stairs during the winter, while cold air that has entered from outside stays on the first floor. For this reason, the second floor living room 203 lacks ventilation air volume, so only the SA fan F1 of the ventilation device 1a installed on the second floor is set to the normal air volume, and the EA fan F2 of the ventilation device 1a installed on the second floor is set to the normal air volume. , and the air volume of the SA fan F1 and the EA fan F2 of the ventilation system 1b installed on the first floor is reduced by a predetermined ratio.

By performing such control, warm air in the house circulates to the first floor via the stairs, and the temperature difference between the first floor living room 202 and the second floor living room 203 is eliminated. Furthermore, since ventilation air volume is ensured on both the first and second floors, it is possible to reduce the degree of contamination of indoor air.

In the second embodiment, an example was explained in which the ventilation devices 1a and 1b are installed on the first and second floors of a two-story house to ventilate each floor, but the residential ventilation system according to the present invention is not limited to this. The present invention is not limited to this and can also be applied to houses with three or more floors. When applied to a house with three or more floors, only the SA fan F1 of the ventilation system installed on the top floor has a normal air volume, and the EA fan F2 on the top floor, and the SA fan F1 and EA fan F2 installed on the lower floors. All you have to do is reduce the air volume.

In addition, ventilation equipment is installed only on the first floor and the top floor (for example, the first and third floors in the case of a three-story house), and only the air volume of the SA fan F1 of the ventilation equipment installed on the top floor is adjusted to the normal air volume. It is also possible to adopt a configuration in which the air volume of other fans is reduced.

Although the embodiments of the present invention have been described above, the statements and drawings that form part of this disclosure should not be understood as limiting the present invention. For example, although the embodiment uses a house, the present invention is not limited to this, and may be applied to any building other than a house, and may have three or more floors. Further, a plurality of ventilation devices may be provided on each floor, and a plurality of ventilation systems may control each ventilation device. Note that since the operation unit may be operated by an operator different from the user, although terms different from the terms "user" and "operator" are used, the user himself may be the operator. Various other alternative embodiments, implementations, and operational techniques will be apparent to those skilled in the art from this disclosure.

1, 1a, 1b ventilation system 2, 2a, 2b filter 11 total heat exchanger (heat exchanger)
12 Supply air wind speed sensor 13 Exhaust air speed sensor 14 Outside air temperature sensor 15 Indoor temperature sensor 21 Control device 22 Control circuit 23 Hand controller 24 Motor driver 25 SA fan motor 26 EA fan motor 27 Power supply circuit 31 Control unit 32 Storage unit 32a Nonvolatile memory 33 Operation input/output section 34 Input section 35 Output section 41 Microcomputer 42 Display section 43 Operation section 100, 201 House 101 Ceiling section 102 Living room 103 Corridor 111a, 111b Duct 202 1st floor living room 203 2nd floor living room 204 Corridor/stairs 211a, 211b Duct

Claims (9)

an air supply flow path including an air supply fan that supplies outdoor air into the room; and a supply air flow rate sensor that detects the air supply air volume of the air supply fan;
an exhaust flow path including an exhaust fan that exhausts indoor air to the outside, and an exhaust air volume sensor that detects the exhaust air volume of the exhaust fan;
a heat exchanger that exchanges heat between air flowing through the air supply flow path and air flowing through the exhaust flow path;
A control device that controls driving of the air supply fan and the exhaust fan,
The control device includes:
an operation section on which an operator performs input operations;
a non-volatile memory that stores a set air supply air volume of the air supply flow path and a set exhaust air volume of the exhaust flow path based on input from the operation unit,
When installed in a building, a calculation is performed to correct the set supply air volume and the set exhaust air volume to become the effective set supply air volume and the effective set exhaust air volume, respectively, and the effective set supply air volume and the set exhaust air volume are corrected. storing the exhaust air volume in the nonvolatile memory;
controlling the supply air fan so that the supply air volume becomes the effective set supply air volume, and controlling the exhaust fan so that the exhaust air volume becomes the effective set exhaust air volume;
A ventilation system featuring: The calculation is performed using an effective ventilation rate and a sensor error value of the supply air volume sensor and/or the exhaust air volume sensor.
The ventilation device according to claim 1 , characterized in that : an air supply flow path including an air supply fan that supplies outdoor air into the room; and a supply air flow rate sensor that detects the air supply air volume of the air supply fan;
an exhaust flow path including an exhaust fan that exhausts indoor air to the outside, and an exhaust air volume sensor that detects the exhaust air volume of the exhaust fan;
a heat exchanger that exchanges heat between air flowing through the air supply flow path and air flowing through the exhaust flow path;
a control device that controls driving of the air supply fan and the exhaust fan;
An outside air temperature sensor is provided near the outdoor air inlet of the air supply flow path and detects outside air temperature,
The control device includes:
It has an operation section through which an operator performs an input operation, and a nonvolatile memory that stores a set supply air volume of the air supply flow path and a set exhaust air volume of the exhaust flow path based on the input from the operation section. ,
A second lower limit value of the outside air temperature is set in the nonvolatile memory,
controlling the air supply fan so that the supply air volume is the set supply air volume, and controlling the exhaust fan so that the exhaust air volume is the set exhaust air volume,
When the outside air temperature detected by the outside air temperature sensor is lower than the second lower limit value, the rotation speed of the air supply fan motor that drives the air supply fan is set to the minimum rotation speed that can maintain the rotation speed of the motor. The rotation speed should be controlled so that the rotation speed is
A ventilation system featuring : an air supply flow path including an air supply fan that supplies outdoor air into the room; and a supply air flow rate sensor that detects the air supply air volume of the air supply fan;
an exhaust flow path including an exhaust fan that exhausts indoor air to the outside, and an exhaust air volume sensor that detects the exhaust air volume of the exhaust fan;
a heat exchanger that exchanges heat between air flowing through the air supply flow path and air flowing through the exhaust flow path;
A control device that controls driving of the air supply fan and the exhaust fan,
The control device includes:
It has an operation section through which an operator performs an input operation, and a nonvolatile memory that stores a set supply air volume of the air supply flow path and a set exhaust air volume of the exhaust flow path based on the input from the operation section. ,
controlling the air supply fan so that the supply air volume is the set supply air volume, and controlling the exhaust fan so that the exhaust air volume is the set exhaust air volume,
If the rotational speed of at least one of the supply air fan and the exhaust fan continues to be lower than a reference rotational speed for a preset time or more, a failure of the supply air flow rate sensor or the exhaust airflow rate sensor is notified;
A ventilation system featuring : 5. The operating unit is capable of inputting the set supply air volume and the set exhaust air volume in units of 1 [m ³ /h] or less. Ventilation equipment. an outside air temperature sensor that is provided near the outdoor air inlet of the air supply flow path and detects outside air temperature;
An indoor temperature sensor is provided in the exhaust flow path near the indoor air inlet and detects the indoor temperature,
A first lower limit value of the outside air temperature and a difference value between the outside air temperature and the indoor temperature are set in the nonvolatile memory,
The control device is configured such that either the outside air temperature detected by the outside air temperature sensor is lower than the first lower limit value, or the temperature difference detected by the outside air temperature sensor and the indoor temperature sensor is larger than the difference value. In this case, controlling the supply air fan and the exhaust fan so that the set supply air volume and the set exhaust air volume are reduced;
The ventilation device according to any one of claims 1, 3 and 4 , characterized in that: The control device is capable of controlling the rotational speed of an air supply fan motor that drives the air supply fan and/or an exhaust fan motor that drives the exhaust fan to a desired rotational speed;
The ventilation device according to any one of claims 1, 3 and 4 , characterized in that: A filter for removing dust is provided near the entrance of the air supply flow path, and upper limit rotation speeds of the air supply fan and the exhaust fan are stored in the nonvolatile memory,
Claims 1 and 3 , wherein the control device issues an alarm prompting replacement of the filter when the rotation speed of at least one of the air supply fan and the exhaust fan exceeds the upper limit rotation speed. , 4. The ventilation device according to any one of 4 . A ventilation system comprising a first ventilation device provided on a first floor and a second ventilation device provided on a second floor higher than the first floor,
The first ventilation device and the second ventilation device are
an air supply flow path including an air supply fan that supplies outdoor air into the room; and a supply air flow rate sensor that detects the air supply air volume of the air supply fan;
an exhaust flow path including an exhaust fan that exhausts indoor air to the outside, and an exhaust air volume sensor that detects the exhaust air volume of the exhaust fan;
a total heat exchanger that exchanges heat between the air supply flow path and the exhaust flow path;
a control device that controls driving of the air supply fan and the exhaust fan;
an outside air temperature sensor that is provided near the outdoor air inlet of the air supply flow path and detects outside air temperature;
The control device includes:
An operating section through which an operator performs an input operation, and a set supply air volume of the air supply flow path, a set exhaust air flow volume of the exhaust flow path, and a first lower limit value of the outside air temperature based on the input from the operating section are stored. a non-volatile memory;
and controlling the supply air fan so that the supply air volume becomes the set supply air volume, and controlling the exhaust fan so that the exhaust air volume becomes the set exhaust air volume,
Furthermore, when the outside air temperature detected by the outside air temperature sensor is lower than the first lower limit value,
The control device for the second ventilation device reduces the set exhaust air volume without changing the set air supply air volume,
The control device for the first ventilation system controls to reduce the set supply air volume and the set exhaust air volume to eliminate the temperature difference between the first floor and the second floor in winter. thing
A ventilation system featuring:

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