JP2016156535A - Ventilator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilator that measures a degree of airtightness of a building and calculates an ideal air supply flow rate of the ventilator on the basis of the degree of airtightness and the temperature difference between the inside and outside of a room, and thereby attains energy saving while performing sufficient ventilation.SOLUTION: A control unit 4 calculates a degree of airtightness of a building; when an indoor temperature is higher than an outside air temperature, calculates an ideal air supply flow rate on the basis of the indoor temperature, the outside air temperature and the degree of air tightness; increases/decreases the rotational frequency of an air supply motor or exhaust motor according to the ideal air supply flow rate; and thereby attains energy saving while performing sufficient ventilation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a ventilator that can measure the degree of sealing (airtight performance) of a building.

  Conventionally, this type of ventilator is known to control the ventilation flow rate of a building in consideration of the natural ventilation flow rate that can be expected from the temperature difference between the inside and outside of the building and the sealing level of the building. Is input and set, and a ventilator capable of controlling the ventilation flow rate with high accuracy regardless of the building is known (for example, see Patent Document 1).

JP 2011-7354 A

  In such a conventional ventilator, since the user inputs and sets the sealing degree for each building, it is necessary to measure the sealing degree in advance. For this reason, in order to measure the degree of sealing, there was a problem that a large-scale equipment dedicated to it was necessary.

  Therefore, the present invention solves the above-described conventional problems, and by using a ventilator equipped with a means for measuring the degree of sealing of a building, the degree of sealing of the building is measured more easily than in the past, and sufficient ventilation is provided. It is possible to obtain a ventilation device that realizes energy saving while performing the above.

  And in order to achieve this objective, the ventilation apparatus which concerns on 1 aspect of this invention calculates the sealing degree of a building by the control part, and after calculating a sealing degree, the supply air blower and the exhaust air blower are operating. In the state, when the indoor temperature detected by the indoor temperature sensor is higher than the outdoor air temperature detected by the outdoor air temperature sensor, the control unit calculates the ideal supply air flow rate based on the indoor temperature, the outdoor air temperature, and the sealing degree. When the current supply air flow rate detected by the supply air flow sensor is larger than the ideal supply air flow rate, the control unit decreases the rotation speed of the supply air motor or the exhaust motor and detects it by the supply air flow rate sensor. If the current air supply flow rate is smaller than the ideal air supply flow rate, the rotation speed of the air supply motor or exhaust motor is increased. It is intended to achieve.

  According to the present invention, a ventilation device that measures energy conservation while performing sufficient ventilation by measuring the degree of sealing of a building and calculating an ideal supply air flow rate of the ventilation device from the degree of sealing and the temperature difference between indoor and outdoor. Can be obtained.

Schematic which shows the ventilator of Embodiment 1 of this invention. The flowchart figure which shows the flow which calculates and memorize | stores the sealing degree of the building provided with the ventilation apparatus The flowchart figure which shows the flow which controls the ventilation flow rate of the ventilator

  A ventilator according to an aspect of the present invention includes an air supply fan provided with an air supply motor, an exhaust air fan provided with an exhaust motor, and an air supply air passage that is blown indoors from the outside by the air supply fan. , An exhaust air blowing path for blowing air from the room to the outside by the exhaust air blower, an air supply flow rate sensor for detecting an air supply flow rate flowing through the air supply air blowing path, an outside air temperature sensor for detecting an outside air temperature, and an indoor temperature detection Ventilation for controlling the operation and the number of rotations of the supply motor and the exhaust motor by a control unit. In the state where the exhaust port from the inside of the building to the outside is closed and the air supply blower is operating, the control unit is configured to control the outside air detected by the outside air pressure sensor. And the indoor air pressure detected by the internal air pressure sensor and the air supply flow rate detected by the air supply flow sensor, the degree of sealing of the building is calculated, and after calculating the degree of airtightness, the air supply blower and the In a state where the exhaust blower is operating, when the indoor temperature detected by the indoor temperature sensor is higher than the outdoor air temperature detected by the outdoor air temperature sensor, the control unit may calculate the indoor temperature and the outdoor air temperature. Based on the degree of sealing, the ideal supply air flow rate is calculated, and the control unit determines that the current supply air flow rate detected by the supply air flow rate sensor is larger than the ideal supply air flow rate. Alternatively, when the number of revolutions of the exhaust motor is decreased and the current supply air flow rate detected by the supply air flow rate sensor is smaller than the ideal supply air flow rate, the It has a structure of increasing the rotational speed of the motor or the exhaust motor air.

  According to this configuration, the airtightness of the building is measured, the ideal air supply flow rate of the ventilator is calculated from the airtightness and the indoor and outdoor temperature difference, and the air supply motor or exhaust motor is matched to the ideal air supply flow rate. The number of rotations can be increased or decreased. For this reason, it is possible to provide a ventilator that realizes energy saving by suppressing ventilation more than necessary while performing sufficient ventilation.

  Further, the control unit calculates the air pressure difference between the outside and the inside of the building a plurality of times based on the outside air pressure detected by the outside air pressure sensor and the indoor air pressure detected by the inside air pressure sensor, and calculates the number of times. The sealing degree may be calculated on the basis of the atmospheric pressure difference and the supply air flow rate detected a plurality of times by the supply air flow sensor.

  According to this configuration, since the sealing degree can be measured with high accuracy, it is possible to provide a ventilation device that realizes energy saving while performing sufficient ventilation.

  The controller may be configured to increase the value of the ideal air supply flow rate and control the pressure inside the building to be higher than the pressure outside the building.

  According to this configuration, the air pressure inside the building can be controlled to be higher than the air pressure outside the building, so that it is possible to prevent air from flowing from the outside of the building into the building through a route other than the ventilation device. In particular, when the outside air is dirty, the indoor air can be prevented from being dirty.

  In addition, a ventilator according to one embodiment of the present invention includes an air supply fan provided with an air supply motor, an exhaust air fan provided with an exhaust motor, and an air supply air blown into the room from the outside by the air supply fan. A path, an exhaust ventilation path that blows air from the room to the outside by the exhaust blower, an air supply flow rate sensor that detects an air supply flow rate that flows through the supply air ventilation path, and an exhaust gas that detects an exhaust flow rate that flows through the exhaust ventilation path A flow rate sensor, an outside air temperature sensor that detects the outside air temperature, an indoor temperature sensor that detects the room temperature, an outside air pressure sensor that detects the outside air pressure, and an inside air pressure sensor that detects the inside air pressure. A ventilating device for controlling the operation and rotation speed of an air supply motor and the exhaust motor, wherein the exhaust air blower is operating while the air supply port from the outside to the inside of the building is closed The control unit calculates the degree of sealing of the building based on the external air pressure detected by the external air pressure sensor, the indoor air pressure detected by the internal air pressure sensor, and the exhaust flow rate detected by the exhaust flow sensor. Then, after calculating the sealing degree, the indoor temperature detected by the indoor temperature sensor is higher than the outdoor air temperature detected by the outdoor air temperature sensor in a state where the supply air blower and the exhaust air blower are operating. In this case, the control unit calculates an ideal supply air flow rate based on the indoor temperature, the outside air temperature, and the sealing degree, and the control unit detects the current supply air flow rate detected by the supply air flow rate sensor. Is larger than the ideal air supply flow rate, the rotational speed of the air supply motor or the exhaust motor is decreased, and the air supply flow rate sensor Current supply flow rate is detected Te is smaller than the ideal air supply flow rate may be configured of increasing the rotational speed of the air supply motor or motors for the exhaust.

  According to this configuration, the airtightness of the building is measured, the ideal air supply flow rate of the ventilator is calculated from the airtightness and the indoor and outdoor temperature difference, and the air supply motor or exhaust motor is matched to the ideal air supply flow rate. The number of rotations can be increased or decreased. For this reason, it is possible to provide a ventilator that realizes energy saving by suppressing ventilation more than necessary while performing sufficient ventilation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, the ventilation device 21 includes an air supply blower 1 having an air supply motor for supplying outdoor air into the room and an exhaust air blower having an exhaust motor for exhausting indoor air to the outdoors. 2 is provided inside the main body.

  By the air supply blower 1, an air supply / air flow path 27 is formed inside the main body such that outdoor air enters the main body through the external air suction port 22 and is supplied into the room through the external air supply port 24. Further, the exhaust blower 2 forms an exhaust blow path 28 inside the main body in which room air enters the main body through the indoor air suction port 25 and is exhausted to the outside through the indoor air exhaust port 23.

  The ventilation device 21 includes an air supply flow rate sensor 11 that detects an air supply flow rate flowing through the air supply / airflow path 27 by, for example, reading a wind speed. The ventilator 21 also includes an exhaust flow sensor 10 that detects the exhaust flow rate flowing through the exhaust ventilation path 28 by, for example, reading the wind speed. However, the exhaust flow sensor 10 is not necessarily provided.

  In FIG. 1, an outside air temperature sensor 7 that detects an outside air temperature and an outside air pressure sensor 9 that detects outside air pressure are provided in an air supply / air flow path 27 inside the main body. Note that the outside air temperature sensor 7 and the outside air pressure sensor 9 may be provided outside the main body, for example, at an arbitrary place outside. Further, an indoor temperature sensor 6 for detecting the indoor temperature and an internal air pressure sensor 8 for detecting the indoor air pressure are provided in the exhaust air blowing path 28 inside the main body. The indoor temperature sensor 6 and the internal atmospheric pressure sensor 8 may be provided outside the main body, for example, at any place in the room.

  The ventilation device 21 is connected to the remote controller 3. The remote controller 3 performs operation switching and various settings for each fan motor.

  The ventilation device 21 is connected to the control unit 4. The control unit 4 performs calculation using values detected by the sensors and stores information in the memory 5. Further, the control unit 4 can adjust the amount of rotation of the supply motor and the exhaust motor. In addition, although the control part 4 was provided in the main body of the ventilator 21, you may provide the control part 4 in the place away from the main body of the ventilator 21, and even if the ventilator is controlled by the control part 4 in a remote place. Good. In FIG. 1, the ventilation device 21 is connected to the remote controller 3 via the control unit 4 as an example.

  FIG. 2 is a flowchart showing a flow of calculating the sealing degree of the building including the ventilation device 21 by the control unit 4 and storing the calculated sealing degree in the memory 5.

  The degree of sealing of the building means the degree of sealing of the outer peripheral part (building skin) separating the inside and outside of the building. When calculating the degree of sealing shown in FIG. 2, except for the air supply / airflow path 27 or the exhaust airflow path 28, the doors and windows of the building outer skin and other opening / closing objects contacting the building outer skin are normally closed. In addition, it is desirable that the doors of the rooms are opened inside the building so that the whole building responds to indoor air pressure as a single space. Other supply / exhaust ventilators other than the ventilator 21 such as a ventilating fan and a range hood may be stopped and a cover may be provided so as not to leak air.

  From now on, the flow of calculating the sealing degree of the building including the ventilation device 21 by the control unit 4 will be described with reference to FIG.

  First, by pressing the sealing degree calculation mode operation button using the remote controller 3, only one of the air supply blower 1 and the exhaust blower 2 is operated.

  Here, when the air supply blower 1 is operated, the opening / closing object (exhaust opening from the inside of the building to the outside) in contact with the building skin including the exhaust air supply path 28 is normally closed except for the air supply air supply path 27. State. In this case, the exhaust ventilation path 28 may be strained so that there is no air leakage. When the exhaust blower 2 is operated, except for the exhaust blower path 28, the open / closed objects (the air supply opening from the outside of the building to the inside) that are in contact with the building skin including the air supply blower path 27 are normally closed. State. In this case, the air supply / airflow path 27 may be strained to prevent air leakage.

(When operating only the air supply blower)
Hereinafter, a case where only the air supply blower 1 is operated will be described.

  Except for the air supply / airflow path 27, the open / closed objects (exhaust ports from the inside of the building to the outside) in contact with the building skin including the exhaust airflow path 28 are normally closed. In this case, the exhaust ventilation path 28 may be strained so that there is no air leakage.

  In this state, the external air pressure sensor 9 and the internal air pressure sensor 8 detect the external air pressure and the indoor air pressure, respectively, while operating only the air supply blower 1.

  The control unit 4 calculates the atmospheric pressure difference between indoors and outdoors based on the detected external air pressure and indoor air pressure.

First, the control part 4 adjusts the rotation speed of the air supply motor of the air supply blower 1, and controls the atmospheric pressure difference between indoors and outdoors to be 9.8 [Pa]. The supply air flow rate Q _9.8 when the pressure difference is 9.8 [Pa] is detected by the supply air flow rate sensor 11.

The above-mentioned means for obtaining the supply air flow rate Q _9.8 is an example, and it is desirable in terms of accuracy to measure a plurality of points rather than one point. For example, there is a method of measuring the air pressure difference and the supply air flow rate at five points before and after 9.8 [Pa] and Q _9.8 , respectively, and drawing an approximate line to obtain the supply air flow rate Q _9.8 . Moreover, you may measure the atmospheric | air pressure difference in the initial state which each fan does not drive | operate as an initial atmospheric pressure difference beforehand. In that case, when the air supply blower 1 is operated and the pressure difference and the supply air flow rate are measured, the initial pressure difference is subtracted from the measured pressure difference. Thereby, measurement with higher accuracy is possible.

Next, the total equivalent clearance area αA is calculated by the following formula (Formula 1). The total equivalent clearance area αA is obtained by calculating the effective area of a simple opening equivalent to the clearance based on the flow rate (Q _9.8 ) flowing through the building skin when the pressure difference between the inside and outside of the building is 9.8 [Pa]. Also, the indoor temperature T _i in (Equation 1), when measured supply air flow rate Q _9.8, a pre-detected room temperature by the room temperature sensor 6.

As shown in (Formula 1), the total equivalent clearance area αA is calculated from the supply air flow rate Q _9.8 and the room temperature T _i .

  Next, the total floor area value S is input to the remote controller 3. The total floor area is the floor area of the part related to ventilation in the building skin.

  Next, the building sealing degree C is calculated by the following formula (Formula 2).

  As shown in (Formula 2), the sealing degree C is calculated by the total equivalent clearance area αA and the total floor area value S.

  As described above, the control unit 4 seals the building based on the external air pressure detected by the external air pressure sensor 9, the indoor air pressure detected by the internal air pressure sensor 8, and the supply air flow rate detected by the supply air flow sensor 11. The degree C is calculated.

  Thereafter, the control unit 4 stores the sealing degree C in the memory 5.

  In the above, the calculation method of the sealing degree C was demonstrated about the case where only the air supply blower 1 is drive | operated.

(When operating only the exhaust fan)
Hereinafter, the calculation method of the sealing degree C is demonstrated about the case where only the exhaust air blower 2 is drive | operated.

  Except for the exhaust air supply path 28, the open / closed object (the air supply port from the outside to the inside of the building) including the air supply air supply path 27 is normally closed. In this case, the air supply / airflow path 27 may be strained to prevent air leakage.

  In this state, the external air pressure sensor 9 and the internal air pressure sensor 8 detect the external air pressure and the indoor air pressure, respectively, while operating only the exhaust blower 2.

  The control unit 4 calculates the atmospheric pressure difference between indoors and outdoors based on the detected external air pressure and indoor air pressure.

First, the control part 4 adjusts the rotation speed of the exhaust motor of the exhaust blower 2, and controls the pressure difference inside and outside to be 9.8 [Pa]. The exhaust flow rate Q ′ _9.8 when the pressure difference is 9.8 [Pa] is detected by the exhaust flow rate sensor 10.

Note that the above means for obtaining the exhaust flow rate Q ′ _9.8 is an example, and it is more desirable in terms of accuracy to measure a plurality of points than one point. For example, there is a method in which the pressure difference and the exhaust flow rate are measured at five or more points before and after 9.8 [Pa] and Q ′ _9.8 , respectively, and the exhaust flow rate Q ′ _9.8 is obtained by drawing an approximate line. Moreover, you may measure the atmospheric | air pressure difference in the initial state which each fan does not drive | operate as an initial atmospheric pressure difference beforehand. In that case, when the exhaust fan 2 is operated to measure the pressure difference and the exhaust flow rate, the initial pressure difference is subtracted from the measured pressure difference. Thereby, measurement with higher accuracy is possible.

Next, the total equivalent clearance area αA is calculated by the following formula (Formula 3). The total equivalent clearance area αA is obtained by calculating the effective area of a simple opening equivalent to the clearance based on the flow rate (Q ′ _9.8 ) flowing through the building skin when the pressure difference between the inside and outside of the building is 9.8 [Pa]. Also, the outdoor temperature T _o in (Equation 3), when measured exhaust flow Q _'9.8, a pre-detected outdoor temperature by the outside air temperature sensor 7.

As shown in (Equation 3), the total equivalent clearance area αA is calculated by the exhaust flow rate Q _'9.8 and outdoor temperature T _o.

  Next, the total floor area value S is input to the remote controller 3. The total floor area is the floor area of the part related to ventilation in the building skin.

  Next, the sealing degree C of the building is calculated by the above (Formula 2).

  As shown in (Formula 2), the sealing degree C is calculated by the total equivalent clearance area αA and the total floor area value S.

  As described above, the control unit 4 determines the degree of building sealing C based on the external air pressure detected by the external air pressure sensor 9, the indoor air pressure detected by the internal air pressure sensor 8, and the exhaust gas flow rate detected by the exhaust gas flow sensor 10. Is calculated.

  Thereafter, the control unit 4 stores the sealing degree C in the memory 5.

  The calculation method of the sealing degree C has been described above for the case where only the exhaust blower 2 is operated.

  In this embodiment, an example of calculating the sealing degree C is given. However, if the atmospheric pressure difference and the air supply flow rate (or exhaust flow rate) are known, it is possible to calculate the sealing degree of the building by other methods. .

  FIG. 3 is a flowchart showing a flow in which the control unit 4 controls the ventilation flow rate of the ventilation device 21 using the sealing degree C calculated above.

  First, the air supply blower 1 and the exhaust blower 2 are operated by pressing the ventilation flow rate control operation button of the main body using the remote controller 3.

Then, the outside air temperature T _o by the outside air temperature sensor 7, for detecting the indoor temperature T _i by the indoor temperature sensor 6.

Next, based on the outside air temperature T _o and the room temperature T _i , the control unit 4 calculates the temperature difference between the inside and outside.

When the indoor temperature T _i is equal to or lower than the outside air temperature T _o (when T _i ≦ T _o ), the temperature measurement again returns to the indoor / outdoor temperature measurement after a predetermined time has elapsed.

When the indoor temperature T _i is higher than the outdoor air temperature T _o (when T _i > T _o ), the control unit 4 determines whether or not the inside of the building is based on the indoor / outdoor temperature difference and the previously-stored sealing degree C. The amount of air leaking to the outside through the total equivalent clearance area αA (natural ventilation amount) is calculated. When the room temperature Ti is higher than the outside air temperature To (when T _i > T _o ), it is possible to convection from the inside of the building to the outside through the total equivalent clearance area αA without borrowing the force of the ventilation device 21. The air will flow naturally. The amount of natural ventilation that flows naturally increases as the temperature difference between indoor and outdoor increases, and increases as the total equivalent clearance area αA increases.

The control unit 4, based on the calculated natural ventilation, calculates the ideal air supply flow rate Q _m. Here, the ideal air supply flow rate Q _m is calculated by calculating the air supply flow rate necessary for the ventilation device 21 to supply the inside of the building. For this reason, for example, in an environment where the natural ventilation amount from the indoor to the outdoor increases, even if the rotational speed of the air supply motor or the exhaust motor of the ventilator 21 is slightly lowered, sufficient supply from the outdoor to the indoor is possible. In some cases, the ventilation can be performed by the ventilation device 21.

Next, the supply flow rate Q of the current ventilator 21 detected by the air supply flow sensor 11, the control unit 4 calculates the difference between the ideal charge air flow rate Q _m and the current supply flow rate Q.

When the ideal supply air flow rate Q _m is larger than the current supply air flow rate Q (when Q _m > Q), the control unit 4 determines that ventilation is more than necessary, and the supply air blower 1 or the exhaust air is exhausted. The flow rate of the blower 2 is reduced (the rotational speed of the supply motor or exhaust motor is reduced).

When the ideal supply air flow rate Q _m is smaller than the current supply air flow rate Q (when Q _m <Q), the control unit 4 determines that ventilation is not sufficient, and the flow rate of the supply air blower 1 or the exhaust blower 2 (Increase the rotation speed of the supply motor or exhaust motor).

When the ideal supply air flow rate Q _m is equal to the current supply air flow rate Q (when Q _m = Q), after a predetermined time elapses, the indoor / outdoor temperature measurement is resumed.

As described above, according to the ventilator 21 of the present embodiment, the sealing degree C of the building is measured (calculated), and the ideal supply air flow rate Q _m of the ventilating apparatus is calculated from the sealing degree C and the indoor and outdoor temperature difference. and, it is possible to increase or decrease the rotational speed of the ideal air supply flow rate Q air supply motor or exhaust motor combined to _m. For this reason, it is possible to provide a ventilator that realizes energy saving by suppressing ventilation more than necessary while performing sufficient ventilation.

Incidentally, increasing the ideal air supply flow rate Q _m, it can be controlled higher than the building external pressure building inside the pressure.

  According to this configuration, the air pressure inside the building can be controlled to be higher than the air pressure outside the building, so that air can be prevented from flowing from the outside of the building into the building through a route other than the ventilation device 21. In particular, when the outside air is dirty, the indoor air can be prevented from being dirty.

  The ventilator according to the present invention enables energy saving while performing sufficient ventilation, and is useful as a ventilator that can calculate the degree of sealing of a building.

DESCRIPTION OF SYMBOLS 1 Supply air blower 2 Exhaust air blower 3 Remote control 4 Control part 5 Memory 6 Indoor temperature sensor 7 Outside air temperature sensor 8 Inside air pressure sensor 9 Outside air pressure sensor 10 Exhaust air flow sensor 11 Supply air flow sensor 21 Ventilator 22 Outside air inlet 23 Indoor air exhaust Port 24 Outside air supply port 25 Indoor air intake port 27 Air supply air passage 28 Air exhaust air passage

Claims (6)

An air supply fan equipped with an air supply motor;
An exhaust blower equipped with an exhaust motor;
An air supply air passage that is blown indoors from the outside by the air supply blower;
An exhaust air blowing path for blowing air from indoors to the outside by the exhaust air blower;
An air supply flow rate sensor for detecting an air supply flow rate flowing through the supply air flow path;
An outside temperature sensor for detecting the outside temperature,
An indoor temperature sensor for detecting the indoor temperature;
An atmospheric pressure sensor for detecting the atmospheric pressure;
With an internal pressure sensor that detects the indoor pressure,
A ventilator for controlling operation and rotation speed of the air supply motor and the exhaust motor by a control unit,
In a state where the exhaust port from the inside to the outside of the building is closed and the air supply blower is operating, the control unit is detected by the external air pressure detected by the external air pressure sensor and the internal air pressure sensor. Based on the indoor air pressure and the air supply flow rate detected by the air supply flow sensor, the degree of sealing of the building is calculated,
After calculating the degree of sealing, when the air supply blower and the exhaust blower are operating, the room temperature detected by the room temperature sensor is higher than the outside temperature detected by the outside air temperature sensor The control unit calculates an ideal supply air flow rate based on the indoor temperature, the outside air temperature, and the sealing degree,
When the current supply air flow rate detected by the supply air flow rate sensor is larger than the ideal supply air flow rate, the control unit decreases the rotation speed of the supply air motor or the exhaust motor, and A ventilator characterized in that when the current supply air flow rate detected by a flow sensor is smaller than the ideal supply air flow rate, the number of revolutions of the supply motor or the exhaust motor is increased. The control unit calculates the air pressure difference between the outside and the inside of the building a plurality of times based on the outside air pressure detected by the outside air pressure sensor and the indoor air pressure detected by the inside air pressure sensor, and is calculated a plurality of times. The ventilation device according to claim 1, wherein the degree of sealing is calculated based on the pressure difference and an air supply flow rate detected a plurality of times by the air supply flow rate sensor. The ventilation device according to claim 1 or 2, wherein the control unit increases the value of the ideal supply air flow rate to control the air pressure inside the building to be higher than the air pressure outside the building. An air supply fan equipped with an air supply motor;
An exhaust blower equipped with an exhaust motor;
An air supply air passage that is blown indoors from the outside by the air supply blower;
An exhaust air blowing path for blowing air from indoors to the outside by the exhaust air blower;
An air supply flow rate sensor for detecting an air supply flow rate flowing through the supply air flow path;
An exhaust flow rate sensor for detecting an exhaust flow rate flowing through the exhaust ventilation path;
An outside temperature sensor for detecting the outside temperature,
An indoor temperature sensor for detecting the indoor temperature;
An atmospheric pressure sensor for detecting the atmospheric pressure;
With an internal pressure sensor that detects the indoor pressure,
A ventilator for controlling operation and rotation speed of the air supply motor and the exhaust motor by a control unit,
In a state where the air supply port from the outside to the inside of the building is closed and the exhaust blower is operating, the control unit is detected by the external air pressure detected by the external air pressure sensor and the internal air pressure sensor. Calculate the degree of sealing of the building based on the indoor pressure and the exhaust flow rate detected by the exhaust flow sensor,
After calculating the degree of sealing, when the air supply blower and the exhaust blower are operating, the room temperature detected by the room temperature sensor is higher than the outside temperature detected by the outside air temperature sensor The control unit calculates an ideal supply air flow rate based on the indoor temperature, the outside air temperature, and the sealing degree,
When the current supply air flow rate detected by the supply air flow rate sensor is larger than the ideal supply air flow rate, the control unit decreases the rotation speed of the supply air motor or the exhaust motor, and A ventilator characterized in that when the current supply air flow rate detected by a flow sensor is smaller than the ideal supply air flow rate, the number of revolutions of the supply motor or the exhaust motor is increased. The control unit calculates the air pressure difference between the outside and the inside of the building a plurality of times based on the outside air pressure detected by the outside air pressure sensor and the indoor air pressure detected by the inside air pressure sensor, and is calculated a plurality of times. The ventilation device according to claim 4, wherein the degree of sealing is calculated based on the pressure difference and an exhaust flow rate detected a plurality of times by the exhaust flow sensor. The ventilation device according to claim 4 or 5, wherein the control unit increases the value of the ideal supply air flow rate to control the air pressure inside the building to be higher than the air pressure outside the building.

Images