WO2022224460A1

WO2022224460A1 - Ventilation control device, ventilation control program, and ventilation control method

Info

Publication number: WO2022224460A1
Application number: PCT/JP2021/016549
Authority: WO
Inventors: 勇人堀江
Original assignee: 三菱電機株式会社
Priority date: 2021-04-23
Filing date: 2021-04-23
Publication date: 2022-10-27
Also published as: JPWO2022224460A1

Abstract

This ventilation control device (100) comprises an acquisition unit (111) and a control unit (113). The acquisition unit (111) acquires: ventilation parameters; operation conditions indicating the blowing direction and blowing amount of a circulator (420) that is disposed in a room (400) and operates under the ventilation parameters; and a measurement value of a target index that is one of environmental indexes of the room (400) when the circulator (420) operates under the operation conditions. A learning unit (112) uses the ventilation parameters, the operation conditions, and the measurement value to learn the operation conditions of the circulator (420) under which the target index under a novel ventilation parameter is a target state set as a target.

Description

Ventilation control device, ventilation control program and ventilation control method

The present disclosure relates to a ventilation control device, a ventilation control program, and a ventilation control method.

In recent years, most properties have ventilation equipment installed in order to keep the indoor carbon dioxide concentration below a certain value according to various laws and regulations. On the other hand, it is conceivable that there is a case where there is no ventilation device, and even if a ventilation device is installed, ventilation by opening the window is also used.

Here, for ventilation by opening windows, the amount of ventilation changes depending on the position of the window, the open area of the window, as well as the direction and speed of the outside air. Therefore, simply opening a window does not guarantee that the amount of ventilation in the room will be maximized.

Conventionally, there are techniques for adjusting the wind direction and air volume of a circulator installed indoors so that the carbon dioxide concentration in the room is reduced (for example, Patent Documents 1 and 2).

However, conventionally, the technology is to operate the circulator based on the detection of the carbon dioxide concentration, and there is no mention of control that maximizes the ventilation air volume when the window is open.

JP 2020-084946 A JP 2012-013389 A

The present disclosure aims to provide a technique for determining the wind direction and wind speed of a circulator that minimizes the indoor carbon dioxide concentration, that is, maximizes the ventilation air volume, according to specific ventilation conditions.

The ventilation control device according to the present disclosure includes:
Ventilation parameters including opening information including the position and area of the opening of a room having an opening for ventilation and outside air information including the wind speed and wind direction of the outside air taken into the room, and placement in the room an operating condition indicating the air blowing direction and air blowing volume of the circulator operating under the ventilation parameters; an acquisition unit that acquires a value;
Using the ventilation parameter, the operating condition, and the measured value, learning the operating condition of the circulator in which the target index under the new ventilation parameter is a target state set as a target. Department and
Prepare.

With this disclosure, the ventilation air volume can be maximized when the window is opened for ventilation. As a result, the carbon dioxide concentration in the room can be lowered and a healthy space can be provided.

1 is a diagram of a first embodiment, showing a first type of ventilation system 600; FIG. FIG. 2 is a diagram of the first embodiment, showing the hardware configuration of the ventilation control device 100; FIG. 4 is a diagram of the first embodiment and is a flow chart showing the operation of the ventilation system 600. FIG. FIG. 10 is a diagram according to the first embodiment and shows a learning result of a learning unit 112; FIG. 4 is a diagram of the first embodiment and is a diagram obtained by converting FIG. 4 into expression of Equation 1; FIG. 10 is a schematic plan view of a room 400 in a second type ventilation system 600 in the first embodiment; FIG. 10 is a diagram of the first embodiment, showing a second type learning result; Fig. 10 is a diagram of the first embodiment, showing changes in air temperature in the room 404; The diagram of the first embodiment shows the learning result of the second type.

In the description and drawings of the embodiments, the same elements and corresponding elements are given the same reference numerals. Descriptions of elements with the same reference numerals are omitted or simplified as appropriate. In the following embodiments, "unit" may be read as "circuit", "process", "procedure", "process" or "circuitry" as appropriate.

Embodiment 1.
A ventilation system 600 according to Embodiment 1 will be described with reference to FIGS. 1 to 9. FIG. The ventilation system 600 has a first type that uses a carbon dioxide sensor 411 and a second type that does not use a carbon dioxide sensor 411 . The first type is described and then the second type.
FIG. 1 shows a first type of ventilation system 600 . FIG. 1 is a schematic plan view of a room 400. FIG. Although there is a person 430 in the room 400, the presence of the person 430 is shown for the sake of convenience, and the person 430 is not shown in the plan view. A first type ventilation system 600 includes an air conditioner 410 , a carbon dioxide sensor 411 , an indoor temperature sensor 412 , a circulator 420 , a ventilation control device 100 , an outdoor temperature sensor 512 and an outdoor air sensor 513 . The outside air sensor 513 measures the wind direction and air volume of the outside air. Circulator 420 blows air in blowing direction 421 .

<First type>
As shown in FIG. 1 , an air conditioner 410 , a carbon dioxide sensor 411 , a room temperature sensor 412 and a circulator 420 are arranged in the room 404 . In the room 400, of the two

windows

401 and 402, the window 401 is closed and the window 402 is open. In the case of the first type in which the carbon dioxide sensor 411 is present, the air conditioner 410 may be omitted. In the room 400, the door 403 located opposite the opened window 402 is also opened. Outside air may exist outside the door 403, or it may be a common area such as a corridor. In addition, the ventilation control device 100 is arranged in the room 404 . Note that the ventilation control device 100 does not have to be placed in the room 404 . Outdoor air 521 and outdoor air 522 exist in the outdoor 504 . Outdoor airflow 522 enters the room 404 through the window 402 . Ventilation air 531 is generated in the room 404 . Ventilation air 531 goes out of the room 404 from the door 403 .

*** Configuration description ***
FIG. 2 shows the hardware configuration of the ventilation control device 100. As shown in FIG.

The ventilation control device 100 is a computer. Ventilation control device 100 includes processor 110 . The ventilation control device 100 includes other hardware such as a memory 120 and a communication interface 130 in addition to the processor 110 . The processor 110 is connected to other hardware via signal lines and controls the other hardware.

The ventilation control device 100 includes an acquisition unit 111, a learning unit 112, and a control unit 113 as functional elements. Functions of the acquisition unit 111 , the learning unit 112 and the control unit 113 are realized by the ventilation control program 121 .

The processor 110 is a device that executes the ventilation control program 121. The processor 110 is an IC (Integrated Circuit) that performs arithmetic processing. Specific examples of the processor 110 are a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and a GPU (Graphics Processing Unit).

The memory 120 is realized by a main storage device and an auxiliary storage device. Specific examples of the main memory are SRAM (Static Random Access Memory) and DRAM (Dynamic Random Access Memory). A specific example of the auxiliary storage device is an HDD (Hard Disk Drive). Memory 120 stores ventilation control program 121 , ventilation parameters 122 and learned information 123 .

The communication interface 130 is a communication port for the processor 110 to communicate with other devices. A circulator 420 , an indoor temperature sensor 412 , a carbon dioxide sensor 411 , an air conditioner 410 , an outdoor temperature sensor 512 and an outdoor air sensor 513 are connected to the communication interface 130 . Processor 110 can exchange data with circulator 420 connected to communication interface 130 via communication interface 130 . The circulator 420 can control the amount and direction of air blowing by the controller 113 of the processor 110 . Acquisition unit 111 can acquire data from circulator 420 , indoor temperature sensor 412 , carbon dioxide sensor 411 , air conditioner 410 , outdoor temperature sensor 512 , and outdoor air sensor 513 via communication interface 130 . Control unit 113 can control circulator 420 via communication interface 130 .

The ventilation control program 121 is a program that causes a computer to execute each process, each procedure, or each process obtained by replacing the “units” of the acquisition unit 111, the learning unit 112, and the control unit 113 with “processing,” “procedure,” or “step.” is.

Also, the ventilation control method is a method performed by the ventilation control device 100, which is a computer, executing the ventilation control program 121. The ventilation control program 121 may be stored in a computer-readable recording medium and provided, or may be provided as a program product.

***Description of operation***
FIG. 3 is a flow chart showing the operation of ventilation system 600 . The first type ventilation system 600 has two steps, a learning mode step S11 and a ventilation mode step S12. The learning mode of step S11 is a mode for machine-learning the wind direction and wind speed of the circulator 420 for maximizing the ventilation rate of the room 400 by opening the window. The ventilation mode of step S12 is a mode in which circulator 420 is operated with the wind direction and wind speed of circulator 420 learned in the learning mode of step S12.

<Step S11: Learning Mode>
The learning mode, as shown in FIG. 1, operates the circulator 420 at a certain wind direction and wind speed when one or more persons 430 are present in the room 404 and the acquisition unit 111 senses the ventilation parameters 122 .

<Acquisition of learning data>
In the learning mode, the acquisition unit 111 acquires (1) the ventilation parameter 122, (2) the operating conditions of the circulator 420 operating under the ventilation parameter 122, and (3) the measured value of the target index. Acquisition unit 111 outputs the acquired data to learning unit 112 . Note that the operation of the circulator 420 in the learning mode may be performed by the control unit 113 or may be performed by a person.
(1) Ventilation parameters 122 include opening information including the position and area of openings in a room having openings for ventilation, and outside air information including the wind speed and direction of the outside air taken into the room. The opening corresponds to the window 402 and the door 403 in the room 400 shown in FIG. In the case of FIG. 1, the opening information includes the positions of the window 402 and the door 403 in the room 400 and the opening area of the window 402 and the door 403 in the open state. Aperture information can be obtained from information such as CAD data. The acquisition unit 111 can acquire outside air information including the wind speed and wind direction of the outside air from the outside air sensor 513 .
(2) The operating conditions of circulator 420 operating under ventilation parameters 122 include the blowing direction and blowing amount of circulator 420 . Acquisition unit 111 acquires the operating conditions from circulator 420 via communication interface 130 .
(3) A target indicator is one of the environmental indicators of the room when the circulator 420 operates under operating conditions in the learning mode. For the first type of ventilation system 600, an example target indicator is the concentration of carbon dioxide. In the case of the second type ventilation system 600 described later, an example of the target indicator is the temperature of the room 404 . Therefore, the measured value of the target index is the carbon dioxide concentration value for the first type, and the indoor temperature value for the second type. The acquisition unit 111 can acquire the carbon dioxide concentration value from the carbon dioxide sensor 411 . For the second type 2, the acquisition unit 111 can acquire the room temperature from the room temperature sensor 412 .

As described above, the learning unit 112 obtains from the acquisition unit 111 (1) the ventilation parameter 122, (2) the operating conditions of the circulator 420 operating under the ventilation parameter 122, and (3) the measured value of the target index , the measured value of the concentration of carbon dioxide, is entered. The learning unit 112 stores the concentration of carbon dioxide or the change in concentration of carbon dioxide per unit time in the memory 120 in association with (1) the ventilation parameter 122 and (2) the operating conditions of the circulator 420 .

<Description of learning>
FIG. 4 shows learning results of the learning unit 112 . The learning unit 112 uses (1) the ventilation parameter 122, (2) the operating conditions of the circulator 420, and (3) the measured value of the target index to set the target index under the new ventilation parameter as a target. It learns the operating conditions of the circulator 420 which is the target state. A first type of indicator of interest is the concentration of carbon dioxide in the room. The target state is also the concentration minimum state in which the concentration of carbon dioxide is minimized under the new ventilation parameters by any of the operating conditions of the circulator. Specifically, it is as follows.

When the circulator 420 is operated in the learning mode for a certain period of time, the learning unit 112 determines the operating conditions of the circulator 420 as shown in FIG. learn relationships. For simplicity, FIG. 4 shows a state in which the circulator 420 has a fixed airflow rate and a variable airflow direction between 0 degrees and 360 degrees. Considering a blowing vector indicating a blowing direction, the blowing vector is assumed to be parallel to the floor in FIG. 1, which is a plan view, and rotates once in a plane parallel to the floor. In FIG. 4 , the horizontal axis is the direction θ [rad] of the airflow vector with respect to a certain direction in the room 404 , and the vertical axis is the carbon dioxide concentration D [ppm] in the room 404 . Based on the results of learning by the learning unit 112 shown in FIG. 4, it is possible to determine the operating conditions of the circulator 420 where the carbon dioxide concentration D in the room 404 is minimized when the ventilation parameter 122 assumes a certain value, that is, a certain new state. The operating condition of circulator 420 that minimizes the carbon dioxide concentration in room 404 means the operating condition of circulator 420 that maximizes ventilation.
The learning unit 112 learns so that the graph of FIG. 4 can be generated for every ventilation parameter 122 . 4 differs for each ventilation parameter 122, the learning unit 112 learns to generate the graph of FIG. 4 when a new ventilation parameter 122 is provided.
It should be noted that instead of the carbon dioxide concentration, the carbon dioxide concentration change rate obtained by the following equation 1 may be used. Note that the reason for adding a negative number is to make the rate of change in concentration of carbon dioxide positive.
Concentration change rate of carbon dioxide =
−{carbon dioxide concentration after time t has elapsed−initial carbon dioxide concentration}÷initial carbon dioxide concentration (Formula 1).

FIG. 5 is a diagram obtained by converting FIG. 4 into the expression of Equation 1. In the case of FIG. 5, the learning unit 112 stores the operating conditions of the circulator at which the maximum ventilation volume is θ (MAX) at which the concentration change rate of carbon dioxide is maximized in the ventilation parameters 122 from which the graph of FIG. 5 is obtained. do.

<Step 12: Ventilation mode>
In ventilation mode, acquisition unit 111 acquires new ventilation parameters 122 . The operating conditions of the circulator 420 for the new ventilation parameter 22 acquired by the control unit 113 and the acquisition unit 111 are determined based on the learning result of the learning unit 112 . Control unit 113 operates the circulator via communication interface 130 under the determined operating conditions. Specifically, it is as follows. In the ventilation mode, the control unit 113 controls the amount of carbon dioxide on the basis of the newly detected ventilation parameter 122 and the "ventilation direction and amount of the circulator according to the ventilation parameter 122" learned by the learning unit 112 in the learning mode. The circulator 420 is operated at the operating conditions of the circulator 420 where the concentration is minimal or the rate of change of the dioxide concentration is maximal. Since the operating condition at which the carbon dioxide concentration is minimized=the operating condition at which the carbon dioxide concentration change rate is maximized, operating under one operating condition simultaneously operates the circulator 420 under the other operating condition.

<Second type ventilation system 600>
In the second type, the indicator of interest is the air temperature in room 400 . The target state is also the ambient temperature state in which the air temperature in the room 400 is the ambient temperature under the new ventilation parameters under any of the operating conditions of the circulator 420 . Specifically, it is as follows.
FIG. 6 is a schematic plan view of a room 400 in a second type of ventilation system 600. FIG. The second type differs from the first type in that the carbon dioxide sensor 411 is not used and the target index is the room temperature, and that the person 430 is not allowed into the room 404 in the learning mode. Therefore, description of common processing is omitted. The configuration of the ventilation control device 100 is the same as in FIG. The second type does not require the carbon dioxide sensor 411 in FIG. Since other points are the same as those in FIG. 2, the drawing is omitted. The operation flow is the same as that in FIG. 3, so it will be omitted.

<Learning mode>
In the second type learning mode, first, when the person 430 is not in the room 404, the controller 113 operates the air conditioner 410 to keep the temperature in the room 404 constant. The control unit 113 can know the temperature of the room 404 by obtaining the measured value of the room temperature sensor 412 via the communication interface 130 and the acquisition unit 111 . After confirming that the room temperature has reached the set temperature of air conditioner 410 and has been stabilized, control unit 113 stops the operation of air conditioner 410 .
Next, the circulator 420 is operated with a certain blowing direction and blowing amount as in the first type. The operation of the circulator 420 may be performed by the controller 113 or by a person.

In the learning mode, the acquisition unit 111 acquires (1) the ventilation parameter 122, (2) the operating conditions of the circulator 420 operating under the ventilation parameter 122, and (3) the measured value of the target index. In the second type, the measured value of the target indicator is the room temperature. The acquisition unit 111 can acquire the room temperature from the room temperature sensor 412 .

The learning unit 112 detects the ventilation parameter 122 via the acquisition unit 111. As in the case of the first type, the learning unit 112 uses the indoor air temperature obtained from the indoor temperature sensor 412 or the indoor air temperature change per unit time obtained from the indoor temperature sensor 412 as the ventilation parameter 122, It is stored in association with the operating conditions with the circulator 420 .

Running the circulator 420 in learning mode for a period of time produces a graph such as that shown in FIG.
FIG. 7 corresponds to FIG. In FIG. 7, the horizontal axis is the direction θ [rad] of the airflow vector with respect to a certain direction in the room 404, and the vertical axis is the indoor air temperature [degC]. As in the first type, the learning unit 112 learns the relationship between the blowing direction and the blowing amount of the circulator 420 and the indoor air temperature. Therefore, by learning by the learning unit 112, when the ventilation parameter 122 takes a certain value, it is possible to determine the operating conditions of the circulator 420 at which the air temperature in the room 404 is closest to the outside air, that is, the ventilation volume is maximized.
Here, the temperature obtained by Equation 2 may be used instead of the indoor air temperature.
Indoor air temperature change = - {indoor air temperature after time t elapsed - initial indoor air temperature} (Equation 2)
The minus on the right side is to make the indoor air temperature change positive. In the case of Equation 2, the learning unit 112 stores that the point at which the room air temperature change is maximum is the operating condition of the circulator with the largest ventilation amount.
FIG. 8 shows changes in air temperature in room 404 . The horizontal axis is the same as in FIG. 7, and the vertical axis is the temperature change in Equation 2. FIG.

<Step S12: Ventilation Mode>
The ventilation mode is similar to the first type. In the ventilation mode, the control unit 113 determines whether the air temperature in the room 404 is closest to the outside air, or The circulator 420 is operated under the operating conditions of the circulator 420 that maximize the air temperature change.

FIG. 9 shows the second type of learning result, which is the same as in FIG. The solid and dashed line graphs differ in ventilation parameters 122 . FIG. 9 reveals the relationship between the ventilation parameters and the operating conditions of the circulator. Therefore, the control unit 113 can adjust the amount of ventilation to some extent to prevent the indoor temperature from becoming too cold by opening the windows in winter, for example, to prevent the indoor temperature from dropping excessively.

*** Effect of Embodiment 1 ***
According to the ventilation system 600 of Embodiment 1, the air blowing direction and the air blowing amount of the circulator that maximize the ventilation air amount during window open ventilation can be determined according to the ventilation parameters. Therefore, it is possible to maximize the amount of ventilation when the windows are open, thereby reducing the concentration of carbon dioxide in the room and providing a healthy space.

In Embodiment 1, the ventilation parameter 122 does not include the temperature difference between the indoor 404 and the outdoor 504 . However, ventilation parameters 122 may also include the temperature difference between indoor 404 and outdoor 504 . The obtaining unit 111 can obtain the temperature difference between the indoor temperature sensor 412 and the outdoor temperature sensor 512 from the measurement data of the indoor temperature sensor 412 and the outdoor temperature sensor 512 .

The first embodiment has been described above. One of the technical matters of the first embodiment may be partially implemented. Two or more technical matters may be combined for implementation.

100 ventilation control device, 110 processor, 111 acquisition unit, 112 learning unit, 113 control unit, 120 memory, 121 ventilation control program, 122 ventilation parameters, 123 learned information, 130 communication interface, 400 room, 401 window, 402 window, 403 door, 404 indoor, 410 air conditioner, 411 carbon dioxide sensor, 412 indoor temperature sensor, 420 circulator, 421 ventilation direction, 430 people, 504 outdoor, 512 outdoor temperature sensor, 513 outdoor air sensor, 521, 522 outdoor air, 531 , 532 ventilation, 600 ventilation system.

Claims

Ventilation parameters including opening information including the position and area of the opening of a room having an opening for ventilation and outside air information including the wind speed and wind direction of the outside air taken into the room, and placement in the room an operating condition indicating the air blowing direction and air blowing volume of the circulator operating under the ventilation parameters; an acquisition unit that acquires a value;
Using the ventilation parameter, the operating condition, and the measured value, learning the operating condition of the circulator in which the target index under the new ventilation parameter is a target state set as a target. Department and
ventilation control device.
The acquisition unit
Get new ventilation parameters,
The ventilation control device
a control unit that determines operating conditions of the circulator for the new ventilation parameter acquired by the acquiring unit based on the results learned by the learning unit, and operates the circulator under the determined operating conditions;
The ventilation control device of claim 1, comprising:
The target index is
is the concentration of carbon dioxide in the room;
The target state is
3. A concentration minimum state according to claim 1 or claim 2, wherein the concentration of carbon dioxide is at a minimum under the new ventilation parameters according to any one of a plurality of operating conditions of the circulator. Ventilation control device.
The measured value is
4. The ventilation control device according to claim 3, which is measured when there is a person in the room.
The target index is
is the temperature of the room;
The target state is
3. The method according to claim 1 or claim 2, wherein the temperature of the room is an outside air temperature condition resulting in the temperature of the outside air under the new ventilation parameters according to any one of a plurality of operating conditions of the circulator. Ventilation control device as described.
The measured value is
6. The ventilation control device according to claim 5, wherein the measurement is performed when there is no person in the room.
to the computer,
Ventilation parameters including opening information including the position and area of the opening of a room having an opening for ventilation and outside air information including the wind speed and wind direction of the outside air taken into the room, and placement in the room an operating condition indicating the air blowing direction and air blowing volume of the circulator operating under the ventilation parameters; an acquisition process for acquiring a value;
Using the ventilation parameter, the operating condition, and the measured value, learning the operating condition of the circulator in which the target index under the new ventilation parameter is a target state set as a target. processing;
Ventilation control program to run
the computer
Ventilation parameters including opening information including the position and area of the opening of a room having an opening for ventilation and outside air information including the wind speed and wind direction of the outside air taken into the room, and placement in the room an operating condition indicating the air blowing direction and air blowing volume of the circulator operating under the ventilation parameters; get the value and
Using the ventilation parameter, the operating condition, and the measured value, the operating condition of the circulator in which the target index under the new ventilation parameter is a target state set as a target is learned. Ventilation control method.