Ventilation fan system

Abstract

To provide a ventilation fan system for ventilating ventilation object spaces with respective ventilation apparatuses, which system promotes the ventilation of a ventilation object space which is not or not sufficiently ventilated with the corresponding ventilation apparatus.SOLUTION: A ventilation fan system includes ventilation apparatuses 3 and 4, air ducts 6b and 7b connecting a ventilation object space 1 and the ventilation apparatus 3, air ducts 9b and 10b connecting a ventilation object space 2 and the ventilation apparatus 4, air ducts 6c and 7c connecting the ventilation object space 2 and the ventilation apparatus 3, and dampers 5a and 5b which are connected to the ventilation apparatus 3 and the air ducts 6c and 7c, and open and close the air ducts 6c and 7c, respectively.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a ventilation air distribution system. [Background technology]

[0002] In order to provide comfortable air conditioning, there are ventilation devices that use an intake fan to introduce air from the outside into the room and an exhaust fan to exhaust air from the room to the outside. In order to reduce the energy required by the air conditioner installed in the room, a heat exchange type ventilation device is used that exchanges heat between the air introduced from the outside into the room and the air introduced from the inside to the outside, and introduces the intake air with reduced temperature difference into the room.

[0003] In office buildings, the degree of indoor air pollution varies greatly depending on the number of people in the room. Usually, the ventilation design of office buildings is designed so that the indoor carbon dioxide (CO2) concentration is below a certain value when the indoor occupancy rate is 100%, but according to literature surveys, the actual indoor occupancy rate is mostly 50-70%, and if the mechanical ventilation output is operated at 100% assuming that the maximum number of people are in the room, the ventilation generates an outside air load, and extra air conditioning energy is used. For example, a method of using the output is fixed and set to a smaller air volume than 100% by a remote control installed on the wall, but when many people are in the room, there is a problem that the indoor air becomes polluted. On the other hand, in the early morning or at night when there are few people or no people at all, excessive ventilation increases the air conditioning load, which is not desirable in terms of energy conservation.

[0004] Patent Document 1 discloses a ventilation device that includes a CO2 sensor that detects CO2 gas in a room and controls the amount of airflow based on the CO2 concentration in the room.

[0005] There are two reasons for ventilating based on the CO2 concentration in a room. The first reason is that high concentrations of CO2 are harmful to the human body, so the indoor CO2 concentration must be controlled to a level that is not harmful to the human body. The second reason is that there are harmful substances other than CO2 that are generated in proportion to the amount of human activity, but it is not easy to detect these other harmful substances, so the relatively easy-to-detect CO2 concentration is used to detect harmful substances that are generated in proportion to the amount of human activity. Therefore, by controlling the ventilation air volume using information on the CO2 concentration in the room from a CO2 sensor, it is possible to obtain a highly energy-saving ventilation device that suppresses excessive ventilation.

[0006] Examples of ventilation and air supply systems that ventilate based on the CO2 concentration include a ventilation and air supply system in which multiple ventilation devices, each equipped with a CO2 sensor, are installed in one room, as in Patent Document 2, and a ventilation and air supply system that controls multiple target spaces with one ventilation device, as in Patent Document 3. In Patent Document 3, the air volume of the ventilation device and the opening degree of the ducts leading from the ventilation device to the two ventilation target spaces are adjusted based on the CO2 concentrations in each of the two ventilation target spaces. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2014-95532 A [Patent Document 2] JP 2018-119752 A [Patent Document 3] Patent Publication No. 2022-190835 Summary of the Invention [Problem to be solved by the invention]

[0008] In a ventilation and air supply system that uses different ventilation equipment for each of multiple target spaces, there are cases where ventilation is insufficient in one target space. In addition to cases where the air quality of the target space suddenly deteriorates, if the target space is a rental venue or conference room, there are cases where ventilation is required in a short period of time, such as during a break between events. The ventilation of the target space depends on the capacity of the ventilation equipment, and the target space cannot be completely ventilated in a short period of time, leaving odors and poor air quality.

[0009] In addition, in environments where the quality of the outside air in a certain ventilation target space is extremely poor depending on the time of day, such as facing a main road with a lot of vehicle traffic, the air quality of the ventilation target space cannot be efficiently improved even if ventilation is performed. Furthermore, if the ventilation equipment for a certain ventilation target space breaks down, ventilation of that space cannot be performed until the breakdown is resolved.

[0010] The present disclosure aims to provide a ventilation and air supply system that ventilates a plurality of ventilation target spaces using corresponding ventilation equipment, and that can promote ventilation of a certain ventilation target space even if ventilation of the space cannot be performed or is insufficient using the corresponding ventilation equipment. [Means for solving the problem]

[0011] The ventilation and air supply system of the present disclosure comprises a first ventilation device, a second ventilation device, a first air duct connecting the first space to be ventilated and the first ventilation device, a second air duct connecting the second space to be ventilated and the second ventilation device, a third air duct connecting the second space to be ventilated and the first ventilation device, and a first damper connected to the first ventilation device and the third air duct and for opening and closing the third air duct. Effect of the Invention

[0012] According to the ventilation / air supply system of the present disclosure, the first damper opens the third air passage, so that the first ventilation device can assist in ventilation of the second ventilation target space. Therefore, even if the second ventilation device cannot ventilate the second ventilation target space or does not ventilate the second ventilation target space sufficiently, ventilation of the second ventilation target space can be promoted. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram of a ventilation air supply system according to a first embodiment of the present disclosure. [Diagram 2] 2 is a configuration diagram of the damper 5a shown in FIG. 1, showing the state of the damper 5a when the opening degree is 0. FIG. [Diagram 3] 2 is a configuration diagram of the damper 5a shown in FIG. 1, showing the state of the damper 5a at an opening degree 3. FIG. [Figure 4] 1 is a correspondence table showing required air volume and assistance level for CO2 concentration level. [Diagram 5] 4 is a flowchart showing an air volume / assistance level determination process of a control unit 23 shown in FIG. [Figure 6] 4 is a flowchart showing an air volume / assistance level determination process of a control unit 23 shown in FIG. [Figure 7] 11 is a correspondence table showing the opening degree of dampers 5a and 5b relative to the increase in air volume. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings and the following description, the same or substantially the same components are designated by the same reference numerals, and the description of the components designated by the same reference numerals will not be repeated.

[0015] Embodiment 1 FIG. 1 shows a schematic diagram of a ventilation air supply system according to the first embodiment. The ventilation air supply system is a system that ventilates ventilation target spaces 1 and 2. An example of the ventilation target spaces 1 and 2 is a room that is partitioned from each other in the same building (for example, an office building). The ventilation air supply system includes a ventilation device 3, dampers 5a and 5b, and air passages 6a to 6c and 7a to 7c. The ventilation device 3 generates an air flow to ventilate one or both of the ventilation target spaces 1 and 2. The ventilation device 3 generates, as the air flow, an intake air flow that supplies air taken in from the outdoors to one or both of the ventilation target spaces 1 and 2, and an exhaust air flow that exhausts air taken in from one or both of the ventilation target spaces 1 and 2 to the outdoors. The ventilation device 3 includes an intake air blower (not shown) that has an intake air fan and a motor to generate an intake air flow, and an intake air blower (not shown) that has an exhaust fan and a motor to generate an exhaust air flow.

[0016] The air passages 6a to 6c, each of which is formed by a duct or the like, are air passages through which the supply air flows, and are hereinafter referred to as the supply air passages 6a to 6c. The damper 5a, which is connected to the ventilation device 3 via the supply air passage 6a, is connected to the supply air passage 6b and opens and closes the supply air passage 6b. The damper 5a is also connected to the supply air passage 6c and opens and closes the supply air passage 6c. When the damper 5a opens the supply air passage 6b and closes the supply air passage 6c, the ventilation device 3 takes in outside air OA1 from the outdoors and supplies it to the ventilation target space 1 as supply air SA1 via the supply air passages 6a and 6b. No supply air flow is generated in the supply air passage 6c. When the damper 5a opens the supply air passage 6c and closes the supply air passage 6b, the ventilation device 3 takes in outside air OA1 from the outdoors and supplies it to the ventilation target space 2 as supply air SA2 via the supply air passages 6a and 6c. No supply airflow occurs in supply air duct 6b. When supply air ducts 6b and 6c are both open, outside air OA1 taken in by ventilation device 3 is divided by damper 5a and supplied as supply air SA1 and SA2 to ventilation target spaces 1 and 2, respectively. In addition, damper 5a is configured to be able to change the opening degree of supply air duct 6b when supply air duct 6b is opened, and to be able to change the opening degree of supply air duct 6c when supply air duct 6c is opened.

[0017] The air passages 7a to 7c, each of which is formed of a duct or the like, are air passages through which the exhaust airflow flows, and are hereinafter referred to as exhaust air passages 7a to 7c. The damper 5b, which is connected to the ventilation device 3 via the exhaust air passage 7a, is connected to the exhaust air passage 7b and opens and closes the exhaust air passage 7b. The damper 5b is also connected to the exhaust air passage 7c and opens and closes the exhaust air passage 7c. When the damper 5b opens the exhaust air passage 7b and closes the exhaust air passage 7c, the ventilation device 3 takes in the return air RA1 from the ventilation target space 1 via the exhaust air passages 7b and 7a and discharges it to the outdoors as exhaust air EA1. No exhaust airflow is generated in the exhaust air passage 7c. When the damper 5b opens the exhaust air passage 7c and closes the exhaust air passage 7b, the ventilation device 3 takes in the return air RA2 from the ventilation target space 2 via the exhaust air passages 7c and 7a and discharges it to the outdoors as exhaust air EA1. No exhaust airflow is generated in the exhaust air passage 7b. When exhaust air ducts 7b and 7c are both open, return air RA1 and RA2 are generated in exhaust air ducts 7b and 7c, respectively, and the return air RA1 and RA2 join together at damper 5b and are exhausted outdoors as exhaust air EA1. Damper 5a is configured to be able to change the opening degree of exhaust air duct 7b when exhaust air duct 7b is opened, and to be able to change the opening degree of exhaust air duct 7c when exhaust air duct 7c is opened.

[0018] The ventilation equipment 3 may be a heat exchange type ventilation equipment including a heat exchanger (not shown) that exchanges heat between the intake air flow and the exhaust air flow.

[0019] The ventilation air supply system includes a ventilation device 4, dampers 8a and 8b, and air passages 9a to 9c and 10a to 10c. The ventilation device 4 generates an air flow and ventilates one or both of the ventilation target spaces 1 and 2. The ventilation device 4 generates, as the air flow, an intake air flow that supplies air taken in from the outdoors to one or both of the ventilation target spaces 1 and 2, and an exhaust air flow that exhausts air taken in from one or both of the ventilation target spaces 1 and 2 to the outdoors. For this reason, the ventilation device 4 includes an intake air blower (not shown) having an intake air fan and generating an intake air flow, and an intake air blower (not shown) having an exhaust fan and generating an exhaust air flow.

[0020] Air passages 9a-9c, each of which is formed by a duct or the like, are air passages through which the supply air flows, and are hereinafter referred to as supply air passages 9a-9c. Damper 8a, which is connected to ventilation equipment 4 via supply air passage 9a, is connected to supply air passage 9b and opens and closes supply air passage 9b. Damper 8a is also connected to supply air passage 9c and opens and closes supply air passage 9c. When damper 8a opens supply air passage 9b and closes supply air passage 9c, ventilation equipment 4 takes in outside air OA2 from the outdoors and supplies it to ventilation target space 2 as supply air SA3 via supply air passage 9a and supply air passage 9b. No supply air flow is generated in supply air passage 9c. When damper 8a opens supply air passage 9c and closes supply air passage 9b, ventilation equipment 4 takes in outside air OA2 from the outdoors and supplies it to ventilation target space 1 as supply air SA4 via supply air passage 9a and supply air passage 9c. No supply airflow occurs in supply air duct 9b. When supply air ducts 9b and 9c are both open, outside air OA2 taken in by ventilation device 4 is divided by damper 8a and supplied as supply air SA3 and SA4 to ventilation target spaces 2 and 1, respectively. Damper 5a is configured to be able to change the opening degree of supply air duct 9b when supply air duct 9b is opened, and to be able to change the opening degree of supply air duct 9c when supply air duct 9c is opened.

[0021] The air passages 10a-10c, each of which is formed of a duct or the like, are air passages through which the exhaust airflow flows, and are hereinafter referred to as exhaust air passages 10a-10c. The damper 8b, which is connected to the ventilation device 4 via the exhaust air passage 10a, is connected to the exhaust air passage 10b and opens and closes the exhaust air passage 10b. The damper 8b is also connected to the exhaust air passage 10c and opens and closes the exhaust air passage 10c. When the damper 8b opens the exhaust air passage 10b and closes the exhaust air passage 10c, the ventilation device 3 takes in the return air RA3 from the ventilation target space 2 via the exhaust air passages 10b and 10a and discharges it to the outside as the exhaust air EA2. No exhaust airflow is generated in the exhaust air passage 10c. When the damper 8b opens the exhaust air passage 10c and closes the exhaust air passage 10b, the ventilation device 4 takes in the return air RA4 from the ventilation target space 1 via the exhaust air passages 10c and 10a and discharges it to the outside as the exhaust air EA2. No exhaust airflow is generated in exhaust air duct 10b. When exhaust air ducts 10b and 10c are both open, return air RA3 and RA4 are generated in exhaust air ducts 10b and 10c, respectively, and these air flows join together at damper 8b and are exhausted outdoors as exhaust air EA2. Damper 5a is configured to be able to change the opening degree of exhaust air duct 10b when exhaust air duct 10b is open, and to be able to change the opening degree of exhaust air duct 10c when exhaust air duct 10c is open.

[0022] The ventilation device 4 may be a heat exchange type ventilation device including a heat exchanger (not shown) that exchanges heat between the intake air flow and the exhaust air flow.

[0023] 2 and 3 are configuration diagrams showing an example of damper 5a. Damper 5a includes a housing 12 connected to supply air ducts 6a, 6b, and 6c, and an airflow adjustment valve 11 provided in housing 12. Airflow adjustment valve 11 adjusts the opening degree of supply air duct 6b and the opening degree of supply air duct 6c. The adjustment of the opening degree adjusts the airflow of the supply airflow flowing through supply air ducts 6b and 6c, respectively. Airflow refers to the volume of air flow per unit time.

[0024] The airflow adjustment valve 11 is composed of a sliding member that slides between a connection port (hereinafter, first connection port) with the supply air duct 6b of the housing 12 and a connection port (hereinafter, second connection port) with the supply air duct 6c of the housing 12. The portions of the first connection port and the second connection port that are not covered by the airflow adjustment valve 11 are the portions where the supply air ducts 6b and 6c open to the ventilation device 3. The airflow adjustment valve 11 increases the opening area of ​​the first connection port and decreases the opening area of ​​the second connection port by sliding in one direction. The airflow adjustment valve 11 decreases the opening area of ​​the first connection port and increases the opening area of ​​the second connection port by sliding in the opposite direction. The airflow adjustment valve 11 can slide to a position that fully opens the first connection port, and at this time, the second connection port is closed. The airflow adjustment valve 11 can also slide to a position that fully opens the second connection port, and at this time, the first connection port is closed.

[0025] The opening degree of supply air duct 6b is represented by the ratio of the area of ​​the opening portion not blocked by air volume adjustment valve 11 to the total area of ​​the first connection port, and the opening degree of supply air duct 6c is represented by the ratio of the area of ​​the opening portion not blocked by air volume adjustment valve 11 to the total area of ​​the second connection port. Therefore, damper 5a is configured such that when the opening degree of supply air duct 6b is increased, the opening degree of supply air duct 6c decreases, and when the opening degree of supply air duct 6b is increased, the opening degree of supply air duct 6c increases.

[0026] The damper 5a adjusts the opening of the intake air ducts 6b and 6c in multiple stages. For example, 11 stages from an opening degree 0 to an opening degree 10 are set for the damper 5a by the control unit 24 described later, and the damper 5a adjusts the opening of the intake air ducts 6b and 6c according to the set opening degree. When the opening degree 0 is set, the opening degree of the intake air duct 6c becomes 0% (= the opening degree of the intake air duct 6b becomes 100%). For each increase in the set opening degree by one stage, the opening degree of the intake air duct 6c increases by 10% (i.e., the opening degree of the intake air duct 6b decreases by 10%). When the opening degree 11 is set, the opening degree of the intake air duct 6c becomes 100% (= the opening degree of the intake air duct 6b becomes 0%). Intake air flows are generated in the intake air ducts 6b and 6c at an air volume ratio according to the opening degree set for the damper 5a.

[0027] Fig. 2 shows the state of damper 5a with the opening set to 0, whereby the air supply from ventilation equipment 3 is supplied only to ventilation target space 1. Fig. 3 shows the state of damper 5a with the opening set to 3, whereby the air supply from ventilation equipment 3 is diverted to ventilation target spaces 1 and 2 at an air volume ratio of 7:3.

[0028] Damper 5b has the same configuration as damper 5a, except that exhaust air ducts 7a, 7b, and 7c are connected to damper 5b instead of supply air ducts 6a, 6b, and 6c, respectively. An opening degree of 0 to 11 is set to damper 5b by control unit 24. When opening degree 0 is set, the opening degree of exhaust air duct 7c is 0% (= the opening degree of exhaust air duct 7b is 100%). For each increase in the opening degree set, the opening degree of exhaust air duct 7c increases by 10% (i.e., the opening degree of exhaust air duct 7b decreases by 10%). When opening degree 11 is set, the opening degree of exhaust air duct 7c is 100% (= the opening degree of exhaust air duct 7b is 0%). Exhaust flow is generated in exhaust air ducts 7b and 7c at an air volume ratio according to the opening degree set to damper 5b.

[0029] Damper 8a has the same configuration as damper 5a, except that supply air ducts 9a, 9b, and 9c are connected to damper 8a instead of supply air ducts 6a, 6b, and 6c, respectively. An opening degree of 0 to 11 is set to damper 8a by control unit 24, which will be described later. When opening degree 0 is set, the opening degree of supply air duct 9c is 0% (= the opening degree of supply air duct 9b is 100%). For each step increase in the opening degree set, the opening degree of supply air duct 9c increases by 10% (i.e., the opening degree of supply air duct 9b decreases by 10%). When opening degree 11 is set, the opening degree of supply air duct 9c is 100% (= the opening degree of supply air duct 9b is 0%). Supply air flows are generated in supply air ducts 9b and 9c at air volume ratios according to the opening degree set to damper 8a.

[0030] Damper 8b has the same configuration as damper 5a, except that exhaust air ducts 10a, 10b, and 10c are connected to damper 8b instead of supply air ducts 6a, 6b, and 6c, respectively. An opening degree of 0 to 11 is set to damper 8b by control unit 24. When the opening degree 0 is set, the opening degree of exhaust air duct 10c is 0% (= the opening degree of exhaust air duct 10b is 100%). For each increase in the opening degree set, the opening degree of exhaust air duct 10c increases by 10% (in other words, the opening degree of exhaust air duct 10b decreases by 10%). When the opening degree 11 is set, the opening degree of exhaust air duct 10c is 100% (= the opening degree of exhaust air duct 10b is 0%). Exhaust flow is generated in exhaust air ducts 10b and 10c at an air volume ratio according to the opening degree set to damper 8b.

[0031] As described above, the ventilation air supply system according to the present embodiment includes the ventilation device 3, the ventilation device 4, the supply air duct 6b, the exhaust air duct 7b, the supply air duct 9b, and the exhaust air duct 10b, and each of the supply air duct 6b and the exhaust air duct 7b connects the target space 1 to the ventilation device 3, and each of the supply air duct 9b and the exhaust air duct 10b connects the target space 2 to the ventilation device 4. The ventilation device 3 ventilates the target space 1 by generating an supply air flow and an exhaust air flow in the supply air duct 6b and the exhaust air duct 7b, respectively, and the ventilation device 4 ventilates the target space 2 by generating an supply air flow and an exhaust air flow in the supply air duct 9b and the exhaust air duct 10b, respectively. The ventilation devices 3 and 4 operate simultaneously to ventilate the target spaces 1 and 2 simultaneously.

[0032] The ventilation system includes an intake air duct 6c, an exhaust air duct 7c, a damper 5a, and a damper 5b. The intake air duct 6c and the exhaust air duct 7c each connect the target space 2 to the ventilation device 3. The damper 5a connected to the ventilation device 3 and the intake air duct 6c opens and closes the intake air duct 6c, and the damper 5b connected to the ventilation device 3 and the exhaust air duct 7c opens and closes the exhaust air duct 7c. When the dampers 5a and 5b open the intake air duct 6c and the exhaust air duct 7c, respectively, the ventilation device 3 generates an airflow for ventilating the target space 2. Therefore, even if the ventilation device 4 cannot ventilate the target space 2 or ventilation is insufficient, the ventilation device 3 can assist the ventilation device 4 to promote ventilation of the target space 2.

[0033] The ventilation system includes an intake air duct 9c, an exhaust air duct 10c, a damper 8a, and a damper 8b. The intake air duct 9c and the exhaust air duct 10c each connect the target space to the ventilation device 4. The damper 8a connected to the ventilation device 4 and the intake air duct 9c opens and closes the intake air duct 9c, and the damper 8b connected to the ventilation device 4 and the exhaust air duct 10c opens and closes the exhaust air duct 10c. When the dampers 8a and 8b open the intake air duct 9c and the exhaust air duct 10c, respectively, the ventilation device 4 generates an airflow for ventilating the target space 1. Therefore, even if the ventilation device 3 cannot ventilate the target space 1 or ventilation is insufficient, the ventilation device 4 can assist the ventilation device 3 to promote ventilation of the target space 1.

[0034] If the ventilation air supply system includes, in addition to the ventilation equipment 3 and 4, other ventilation equipment for ventilating other spaces to be ventilated, the dampers 5a and 5b open and close the supply air duct and the exhaust air duct connected to the other spaces to be ventilated, and the ventilation equipment 3 can assist the other ventilation equipment to ventilate the other spaces to be ventilated. Also, in the ventilation air supply system, the dampers 8a and 8b open and close the supply air duct and the exhaust air duct connected to the other spaces to be ventilated, and the ventilation equipment 4 can assist the other ventilation equipment together with the ventilation equipment 3 to ventilate the other spaces to be ventilated.

[0035] Damper 5a is connected to supply air duct 6b and can change the opening degree of supply air duct 6b and the opening degree of supply air duct 6c. Thus, damper 5a can adjust the air volume of supply air duct 6b and supply air duct 6c required for ventilation of ventilation target spaces 1 and 2. Damper 5b is connected to exhaust air duct 7b and can change the opening degree of exhaust air duct 7b and exhaust air duct 7c. Thus, damper 5b can adjust the air volume of exhaust air duct 7b and exhaust air duct 7c required for ventilation of ventilation target spaces 1 and 2.

[0036] Damper 8a is connected to supply air duct 9b and can change the opening degree of supply air duct 9b and the opening degree of supply air duct 9c. Thus, damper 8a can adjust the air volume of supply air duct 9b and supply air duct 9c required for ventilation of ventilation target spaces 1 and 2. Damper 8b is connected to exhaust air duct 10b and can change the opening degree of exhaust air duct 10b and exhaust air duct 10c. Thus, damper 8b can adjust the air volume of exhaust air duct 10b and exhaust air duct 10c required for ventilation of ventilation target spaces 1 and 2.

[0037] Next, a configuration for controlling the ventilation devices 3 and 4, and the dampers 5a, 5b, 8a, and 8b will be specifically described.

[0038] The ventilation air supply system includes CO2 sensors 21 and 22. The CO2 sensor 21 is provided in the space 1 to be ventilated and measures the CO2 concentration in the air of the space 1 to be ventilated. The CO2 sensor 22 is provided in the space 2 to be ventilated and measures the CO2 concentration in the air of the space 2 to be ventilated. The CO2 sensors 21 and 22 are examples of air quality detection means that detect the air quality of the spaces 1 and 2 to be ventilated, respectively, and the detection target of the air quality detection means provided in the ventilation air supply system is not limited to CO2.

[0039] The ventilation air supply system is equipped with a control means for controlling the system. The control means consists of control units 23 and 24. The control unit 23 is attached to the ventilation device 3, and controls the ventilation device 3, damper 5a, and damper 5b based on the detection result detected by the CO2 sensor 21 and a signal A2 received from the control unit 24. The signal A2 is information indicating whether assistance from the ventilation device 3 is necessary to ventilate the target space 2. The control unit 24 is attached to the ventilation device 4, and controls the ventilation device 4, damper 8a, and damper 8b based on the detection result detected by the CO2 sensor 22 and a signal A1 received from the control unit 23. The signal A1 is information indicating whether assistance from the ventilation device 4 is necessary to ventilate the target space 1.

[0040] The following is a detailed description of the operations of the control units 23 and 24. Note that the operations of the control units 23 and 24 can be rephrased as operations of the control means of the ventilation air supply system.

[0041] The control unit 23 judges whether to open the supply air duct 6c and the exhaust air duct 7c based on the signal A2 from the control unit 24. When it is judged that the supply air duct 6c and the exhaust air duct 7c are opened, the control unit 23 adjusts the opening degree of the supply air ducts 6b and 6c and the exhaust air ducts 7b and 7c based on the CO2 concentration detected by the CO2 sensor 21. Specifically, the control unit 23 determines one of the above-mentioned opening degrees 1 to 11 based on the CO2 concentration, and sets the opening degree to the dampers 5a and 5b. When it is judged that the supply air duct 6c and the exhaust air duct 7c are closed, the control unit 23 sets the dampers 5a and 5b to an opening degree of 0. The control unit 23 further determines the air volume of the ventilation device 3 based on the CO2 concentration detected by the CO2 sensor 21, and controls the supply air blower and the exhaust air blower of the ventilation device 3 to achieve the determined air volume. Here, the air volume of the ventilation device refers to each air volume of the supply air flow and the exhaust air flow output by the ventilation device 3. Typically, the air volume of the intake airflow and the air volume of the exhaust airflow are set to the same value.

[0042] 4 is an example of a correspondence table showing required airflow levels and assistance levels against CO2 concentration levels, which is prepared in advance as reference data and stored in the internal memory of the control unit 23. Concentration 1 to concentration 11 are set as the CO2 concentration levels, and the concentration range specifies the concentration level of the CO2 concentration detected by the CO2 sensor 21. When the CO2 concentration is, for example, 1400 ppm or more and less than 1500 ppm, the concentration level is concentration 2.

[0043] Corresponding to the concentrations 1 to 10, the required airflow rates 1 to 10 are set as the required airflow levels. The required airflow rate 10 is set for the concentration 11. The required airflow rates 1 to 10 indicate the airflow rates of the airflow required for ventilation of the ventilation target space 1 when the CO2 concentration detected by the CO2 sensor 21 is at each concentration level, that is, the airflow rates of the airflow that should be generated in the supply air duct 6b and the exhaust air duct 7b when the ventilation device 3 is operating. The airflow rate of the airflow required for ventilation of the ventilation target space 1 increases with each increase in the required airflow level. The required airflow rate 10 indicates the same airflow rate as the maximum airflow rate of the ventilation device 3 that can be set by the control unit 23. The required airflow levels include the required airflow rate 0 that does not correspond to the concentration level. The required airflow rate 0 indicates a state in which the ventilation of the ventilation target space 1 is stopped, that is, a state in which the ventilation device 3 is stopped or a state in which the ventilation device 3 is operating but the dampers 5a and 5b close the supply air duct 6b and the exhaust air duct 7b.

[0044] In addition, the available support levels 9 to 0 are set as support levels corresponding to the concentrations 1 to 10. The available support level 10 is set for the required air volume 0. The available support levels 1 to 10 indicate the air volumes that the ventilation equipment 3 can support to ventilate the ventilation target space 2, that is, the air volumes that the ventilation equipment 3 can generate in the supply air duct 6c and the exhaust air duct 7c when the ventilation equipment 3 is operating. The available support level increases by one, and the available support level of the ventilation equipment 3 increases. The available support level 0 indicates that the ventilation equipment 3 cannot support the ventilation equipment 4, but support from the ventilation equipment 4 is also not required. The sum of the available support air volume of the ventilation equipment 3 at the available support level and the required air volume at the corresponding required air volume level is set to be the same value for each available support level. The required support level of the support level corresponds to a concentration of 11, and indicates that support from the ventilation equipment 4 is required because the maximum air volume of the ventilation equipment 3 is insufficient to ventilate the ventilation target space 1 or the ventilation target space 1 cannot be ventilated due to a breakdown of the ventilation equipment 3.

[0045] When the control unit 23 receives the detection result from the CO2 sensor 21, it refers to this reference data and determines the concentration level of the detected CO2 concentration. Each numerical value of the concentration range (1500 ppm, 1400 ppm, ...) is included in the reference data as a threshold value for determining the concentration level. The control unit 23 obtains the required airflow level and assistance level corresponding to the determined concentration level. The control unit 23 determines the opening degree of the dampers 5a and 5b from the obtained required airflow level and assistance level. The control unit 23 also transmits the obtained assistance level to the control unit 24 as a signal A1.

[0046] The control unit 24 decides whether to open the supply air duct 9c and the exhaust air duct 10c based on the signal A1 from the control unit 23. When it is decided to open the supply air duct 9c and the exhaust air duct 10c, the control unit 24 adjusts the opening degree of the supply air ducts 9b and 9c and the exhaust air ducts 10b and 10c based on the CO2 concentration detected by the CO2 sensor 22. Specifically, the control unit 24 decides one of the above-mentioned opening degrees 1 to 11 based on the CO2 concentration, and sets the opening degree to the dampers 8a and 8b. On the other hand, when it is decided to close the supply air duct 9c and the exhaust air duct 7c, the control unit 23 sets the opening degree 0 to the dampers 8a and 8b. The control unit 24 further decides the air volume of the ventilation device 4 based on the CO2 concentration detected by the CO2 sensor 22, and controls the supply air blower and the exhaust air blower of the ventilation device 4 to achieve the decided air volume.

[0047] The internal memory of the control unit 24 stores reference data similar to the correspondence table of Fig. 4. When the control unit 24 receives the detection result of the CO2 sensor 22, it refers to this reference data, determines the concentration level of the detected CO2 concentration, and obtains the required airflow level and assistance level corresponding to the determined concentration level. The control unit 24 determines the opening degree of the dampers 8a and 8b from the obtained required airflow level and assistance level. The control unit 24 also transmits the obtained assistance level to the control unit 23 as a signal A2.

[0048] 4 stored in the control units 23 and 24 is not limited in data format as long as the correspondence between the concentration range, the required airflow level, and the support level is grasped by each control unit. In addition, the threshold value for defining the concentration range, the airflow indicated by the required airflow level, and the airflow indicated by the support level in the reference data referred to by the control unit 23 may be set to the same value as the threshold value for defining the concentration range, the airflow indicated by the required airflow level, and the airflow indicated by the support level in the reference data referred to by the control unit 24, or may be set to different values. Each value is determined according to the operating capacity of the ventilation equipment, the length of the supply air duct and the exhaust air duct, the size of the space to be ventilated, etc.

[0049] FIG. 5 is a flowchart showing the air volume / assistance level determination process by the control unit 23. During ventilation of the ventilation target space 1, in step S1, the control unit 23 receives the detection result from the CO2 sensor 21, determines the concentration level of the CO2 concentration detected by the CO2 sensor 21 by referring to the reference data stored in the control unit 23, and further determines the required air volume level corresponding to the concentration level. When the ventilation of the ventilation target space 1 is set to stop by an instruction from a remote control, switch, etc., the control unit 23 determines the required air volume 0 as the required air volume level. In step S2, the control unit 23 determines the assistance level corresponding to the concentration level. When the required air volume 0 is determined as the required air volume level in step S1, the control unit 23 determines the assistance possible level 10 as the assistance level. After step S2, when a certain set fixed time has elapsed, the process returns to step S1. Therefore, the air volume / assistance level determination process is repeated every fixed time.

[0050] The airflow / assistance level determination process by the control unit 24 is performed in the same manner as in Fig. 5. In the above description of the airflow / assistance level determination process, the airflow / assistance level determination process by the control unit 24 can be understood by replacing the control unit 23 with the control unit 24, the CO2 sensor 21 with the CO2 sensor 22, and the ventilation target space 1 with the ventilation target space 2, respectively.

[0051] 6 is a flowchart showing the operation of the assist control of the control unit 23 for the ventilation device 3 to assist the ventilation device 4. When the required air volume level and the assist level are determined in steps S1 and S2, the control unit 23 determines in step S11 whether or not the assist level determined by the control unit 23 in step S2 (hereinafter referred to as "its own assist level") is any one of the assist possible levels 1 to 10 at which the ventilation device 3 can assist the ventilation device 4. If the control unit 23 determines that its own assist level is any one of the assist possible levels 1 to 10 (step S11: Yes), in step S12, the control unit 23 determines whether or not the assist level determined by the control unit 24 in step S2 and received as signal A2 (hereinafter referred to as "other party's assist level") is a level requiring assistance.

[0052] If it is determined that the other party's support level is a level requiring support (step S12: Yes), in step S13, control unit 23 determines the amount of increase in the air volume due to support. The amount of increase in the air volume indicates the increment in air volume that should be added to the requested air volume level. Specifically, control unit 23 compares the available support level indicated by its own support level with the requested support level related to the other party's support level requiring support, and determines the smaller of the two as the amount of increase in the air volume.

[0053] The assistance request level is a certain fixed value. Alternatively, the assistance request level may be a stepped assistance request level according to the CO2 concentration in the ventilation target space 2. In this case, the control unit 23 receives the detection result of the CO2 sensor 22 from the control unit 24, and obtains the assistance request level corresponding to the CO2 concentration indicated by the detection result. Whether the assistance request level is a fixed value or a stepped value, it is a preset value and is stored in the internal memory of the control unit 23. The assistance request level may be preset by the user via a remote control, a switch, etc.

[0054] For example, when the concentration level of the CO2 concentration detected by the CO2 sensor 21 is concentration 8, the control unit 23 determines the requested airflow level to be requested airflow 8 and the assistance level to the available assistance level 2. When the assistance request level is "1", the increase in airflow is "2". When the assistance request level is "3", the increase in airflow is "3".

[0055] On the other hand, when the control unit 23's own support level is the support required level or the support available level 0 (step S11: No), or when the other party's support level is any of the support available levels 0 to 10 (step S12: No), the control unit 23 determines the increase in the air volume to be zero in step S14. In other words, when the concentration level of the detection result of the CO2 sensor 21 is 10 or more, or the concentration level of the detection result of the CO2 sensor 22 is 10 or less, the increase in the air volume is zero.

[0056] In step S15, the control unit 23 determines the air volume of the ventilation device 3 and the opening degree of the dampers 5a and 5b based on the determined air volume increase amount. The air volume of the ventilation device 3 is set in multiple stages by the control unit 23, for example, 11 stages of air volumes 0 to 10. Air volumes 0 to 10 indicate the same air volumes as the requested air volumes 0 to 10, respectively, and air volume 10 is the maximum air volume of the ventilation device 3 that can be set by the control unit 23. The air volume of the ventilation device 3 is obtained by adding the requested air volume level determined by the control unit 23 in step S1 to the increase amount of the air volume determined in step S13 or S14. For example, when the requested air volume level is requested air volume 8 and the increase amount of the air volume is "1", the air volume of the ventilation device 3 is determined to be air volume 9. When the sum of the requested air volume level and the air volume increase amount exceeds 10, the air volume of the ventilation device 3 is determined to be air volume 10. In other words, when the CO2 concentration detected by the CO2 sensor 21 is at a level below concentration 9 (i.e. the required airflow level acquired by the control unit 23 is lower than airflow 10) and the CO2 concentration detected by the CO2 sensor 22 is at a level of concentration 11 (i.e. the assistance level acquired by the control unit 24 is the level requiring assistance), the control unit 23 adjusts the airflow of the ventilation equipment 3 to an airflow higher than the required airflow level.

[0057] The openings of the dampers 5a and 5b are determined based on reference data representing a correspondence table in Fig. 7. Fig. 7 is a correspondence table showing the openings of the dampers 5a and 5b relative to the amount of increase in airflow, and the reference data is stored in the internal memory of the control unit 23. When the control unit 23 determines the amount of increase in airflow in step S13 or S14, it refers to the reference data to determine the corresponding openings. For example, when the amount of increase in airflow is "3", the openings of the dampers 5a and 5b are 3. When the amount of increase in airflow is zero, the openings of the dampers 5a and 5b are 0. There are no restrictions on the format of the reference data stored in the control unit 23 as long as the control unit 23 can grasp the correspondence between the amount of increase in airflow and the openings.

[0058] Then, the control unit 23 controls the ventilation device 3 to output the air volume determined in step S15. Furthermore, the control unit 23 controls the dampers 5a and 5b to open to the degree determined in step S15. Thereafter, when the next required air volume level and assistance level are determined in steps S1 and S2, the process returns to step S11. That is, the assistance control operation of the control unit 23 is repeated at regular intervals set in the air volume / assistance level determination process.

[0059] The auxiliary control by the control unit 24 for the ventilation device 4 to assist the ventilation device 3 is performed in the same manner as in Fig. 6. In the above explanation of the operation of the auxiliary control, the auxiliary control by the control unit 24 can be understood by replacing the ventilation device 3 and the ventilation device 4 with each other, the control units 23 and 24 with each other, the CO2 sensors 21 and 22 with each other, the ventilated target space 2 with the ventilated target space 1, and the dampers 5a and 5b with the dampers 8a and 8b.

[0060] Each of the control units 23 and 24 is composed of, for example, a CPU (Central Processing Unit) and a memory. The air volume / assistance level determination process and the assist control operation are realized by the CPU executing a program stored in the memory. However, some or all of the functions of the control units 23 and 24 may be realized by a dedicated processing circuit.

[0061] In the ventilation air supply system configured as above, the control of the ventilation device 3 and the dampers 5a and 5b can be summarized as follows.

[0062] The ventilation air supply system includes CO2 sensors 21 and 22 that detect the air quality in the ventilation target spaces 1 and 2, respectively, and a control unit 23 that adjusts the air volume of the ventilation device 3, the opening degree of the supply air duct 6b and the exhaust air duct 7b, and the opening degree of the supply air duct 6c and the exhaust air duct 7c, based on the detection results of the CO2 sensors 21 and 22. Therefore, when the ventilation device 3 assists the ventilation device 4, it can adjust the air volumes of the respective air flows required for ventilation of the ventilation target spaces 1 and 2 in accordance with the dirtiness of the air in the ventilation target spaces 1 and 2.

[0063] The control unit 23 determines the required air volume for ventilating the ventilation target space 1 based on the detection result of the CO2 sensor 21. When the required air volume is smaller than the maximum air volume that can be generated by the ventilation device 3 and the detection result of the CO2 sensor 22 is equal to or greater than a certain first threshold (1500 ppm in FIG. 4), the control unit 23 controls the dampers 5a and 5b so that the supply air duct 6c and the exhaust air duct 7c are opened, and controls the ventilation device 3 so that the air volume is higher than the determined required air volume. Thus, the ventilation device 3 can increase the air volume to promote ventilation of the ventilation target space 2. At this time, the control unit 23 adjusts the opening degree of the supply air duct 6b and the exhaust air duct 7b and the opening degree of the supply air duct 6c and the exhaust air duct 7c to an opening degree according to the required air volume. When the ventilation device 3 ventilates the ventilation target spaces 1 and 2, it can generate an air flow that is neither too much nor too little in the supply air ducts 6b and 6c and the exhaust air ducts 7b and 7c.

[0064] When the required air volume is the maximum air volume that can be generated by the ventilation equipment 3, the control unit 23 controls the dampers 5a and 5b to close the supply air duct 6c and the exhaust air duct 7c. When the air in the ventilation target space 1 is so polluted that the ventilation equipment 3 has no room to assist the ventilation equipment 4, the ventilation equipment 3 can be made to concentrate on ventilating the ventilation target space 1.

[0065] The control of the ventilation device 4 and the dampers 8a and 8b can be summarized as follows.

[0066] The ventilation air supply system includes a control unit 24 that adjusts the air volume of the ventilation device 4, the opening degree of the supply air duct 9b and the exhaust air duct 10b, and the opening degree of the supply air duct 9c and the exhaust air duct 10c, based on the detection results of the CO2 sensor 21 and the CO2 sensor 22. Therefore, when the ventilation device 4 assists the ventilation device 3, it is possible to adjust the air volume of each of the air flows required for ventilation of the ventilation target spaces 1 and 2 according to the dirtiness of the air in the ventilation target spaces 1 and 2.

[0067] Generally, ventilation systems are designed to keep the CO2 concentration in the room below a certain level when the occupancy rate in the target space is 100%, so the ventilation equipment operates at a reduced air volume when the occupancy rate is normal. Therefore, even if the environment in a target space suddenly deteriorates for some reason, other ventilation equipment often still has the ability to increase the air volume to support the ventilation equipment for that target space.

[0068] The control unit 24 determines the required air volume for ventilating the ventilation target space 2 from the detection result of the CO2 sensor 22. When the required air volume is smaller than the maximum air volume that can be generated by the ventilation device 4 and the detection result of the CO2 sensor 21 is equal to or greater than a second threshold value (which may be the same as or different from the first threshold value), the control unit 24 controls the dampers 8a and 8b so that the supply air duct 9c and the exhaust air duct 10c are opened, and controls the ventilation device 4 so that the air volume is higher than the determined required air volume. Thus, the ventilation device 4 can increase the air volume to promote ventilation of the ventilation target space 1. At this time, the control unit 24 adjusts the opening degree of the supply air duct 9b and the exhaust air duct 10b and the opening degree of the supply air duct 9c and the exhaust air duct 10c to an opening degree according to the required air volume. When the ventilation device 4 ventilates the ventilation target spaces 1 and 2, it is possible to generate an air flow that is neither too much nor too little in the supply air ducts 9b and 9c and the exhaust air ducts 10b and 10c.

[0069] When the required air volume is the maximum air volume that can be generated by the ventilation equipment 4, the control unit 24 controls the dampers 8a and 8b to close the supply air duct 9c and the exhaust air duct 10c. When the air in the ventilation target space 2 is so polluted that the ventilation equipment 3 cannot assist the ventilation equipment 3, the ventilation equipment 4 can be made to concentrate on ventilating the ventilation target space 2.

[0070] In this ventilation air supply system, the control units 23 and 24 are separate, but they may be a control means constituted by a single control unit. The single control unit is installed in the building so as to be able to communicate with the control units 23 and 24 and the dampers 5a, 5b, 8a, and 8b.

[0071] In addition, in this ventilation and air supply system, each of the ventilation devices 3 and 4 generates both an intake airflow and an exhaust airflow, but it may also be a type that generates only an intake airflow. In that case, the exhaust airflow ducts 7a, 7b, 7c, 10a, 10b, and 10c and the dampers 5b and 8b are not provided. The control units 23 and 24 do not need to control the dampers 5b and 8b. Conversely, each of the ventilation devices 3 and 4 may also be a type that generates only an exhaust airflow. In that case, the intake airflow ducts 6a, 6b, 6c, 9a, 9b, and 9c and the dampers 5a and 8a are not provided. The control units 23 and 24 do not need to control the dampers 5a and 8a.

[0072] The embodiments disclosed herein are merely illustrative, and modifications, omissions, or additions of components are possible within the scope of the claims. [Explanation of symbols]

[0073] 1, 2 space to be ventilated, 3, 4 ventilation equipment, 5a, 5b, 8a, 8b dampers, 6a, 6b, 6c, 9a, 9b, 9c intake air duct, 7a, 7b, 7c, 10a, 10b, 10c exhaust air duct, 11 air volume control valve, 12 housing, 21, 22 CO2 sensor, 23, 24 control unit.

Claims

1. A first ventilation device; A second ventilation device; a first air passage connecting a first ventilation target space to the first ventilation device; a second air passage connecting a second ventilation target space to the second ventilation device; A third air duct connecting the second ventilation target space to the first ventilation device; and a first damper connected to the first ventilation device and the third air passage and configured to open and close the third air passage; A ventilation system comprising:

2. 2. The ventilation or blowing system according to claim 1, wherein the first damper is connected to the first air passage, and an opening degree of the first air passage and an opening degree of the third air passage are changeable.

3. a first air quality detection means for detecting the air quality of the first ventilation target space; A second air quality detection means for detecting the air quality of the second ventilation target space; and a control means for adjusting the air volume of the first ventilation device, the opening degree of the first air duct, and the opening degree of the third air duct based on the detection result of the first air quality detection means and the detection result of the second air quality detection means. The ventilation and air distribution system according to claim 2 .

4. The control means determining a required air volume indicating an air volume of the air flow to be generated in the first air passage from the detection result by the first air quality detection means; The ventilation and air supply system of claim 3, wherein when the required air volume is smaller than the maximum air volume of the first ventilation device that can be set by the control means and the detection result by the second air quality detection means is above a certain threshold value, the first damper is controlled so that the third air path is open, and the first ventilation device is controlled so that the air volume is higher than the required air volume.

5. The control means The ventilation and air supply system of claim 4, wherein when the required air volume is smaller than the maximum air volume of the first ventilation device and the detection result by the second air quality detection means is equal to or greater than the threshold value, the opening degree of the first air duct and the opening degree of the third air duct are adjusted to an opening degree corresponding to the required air volume.

6. The control means 6. The ventilation and blowing system according to claim 4, wherein when the required air volume is the maximum air volume of the first ventilation device, the first damper is controlled to close the third air passage.

7. The control means determining a required air volume, which is an air volume of the air flow to be generated in the first air passage, from a detection result by the first air quality detection means; The ventilation and blowing system of claim 3, wherein when the required air volume is the maximum air volume of the first ventilation device that can be set by the control means, the first damper is controlled to close the third air path.

8. A fourth air duct connecting the first ventilation target space to the second ventilation device; and a second damper connected to the second ventilation device and the fourth air passage and configured to open and close the fourth air passage; The ventilation and air distribution system according to claim 1 .

9. the first damper is connected to the first air passage and is capable of changing an opening degree of the first air passage and an opening degree of the third air passage; The ventilation or blowing system according to claim 8 , wherein the second damper is connected to the second air passage, and an opening degree of the second air passage and an opening degree of the fourth air passage are changeable.

10. a first air quality detection means for detecting the air quality of the first ventilation target space; A second air quality detection means for detecting the air quality of the second ventilation target space; and a control means for adjusting the air volumes of the first ventilation device and the second ventilation device and the opening degrees of the first air duct to the fourth air duct based on the detection result of the first air quality detection means and the detection result of the second air quality detection means; The ventilation air distribution system according to claim 9 .

11. The control means determining a first required air volume, which is an air volume of the air flow to be generated in the first air passage, from a detection result by the first air quality detection means; determining a second required air volume, which is an air volume of the air flow to be generated in the second air passage, from the detection result by the second air quality detection means; when the first required air volume is smaller than a maximum air volume of the first ventilation device that can be set by the control means and the detection result by the second air quality detection means is equal to or greater than a first threshold value, controlling the first damper so that the third air passage is opened, and adjusting the air volume of the first ventilation device so that the air volume is higher than the first required air volume; The ventilation and air supply system of claim 10, wherein when the second required air volume is smaller than the maximum air volume of the second ventilation device that can be set by the control means and the detection result by the first air quality detection means is equal to or greater than a second threshold value, the second damper is controlled so that the fourth air path is open, and the air volume of the second ventilation device is adjusted to be higher than the second required air volume.

12. The control means when the first required air volume is smaller than the maximum air volume of the first ventilation device and the detection result by the second air quality detection means is equal to or greater than the first threshold, adjusting an opening degree of the first air duct and an opening degree of the second air duct to an opening degree corresponding to the first required air volume; The ventilation and air supply system of claim 11, wherein when the second required air volume is smaller than the maximum air volume of the second ventilation device and the detection result by the first air quality detection means is equal to or greater than the second threshold value, the opening degree of the second air duct and the opening degree of the fourth air duct are adjusted to an opening degree corresponding to the second required air volume.

13. The control means When the first required air volume is the maximum air volume of the first ventilation device, the first damper is controlled to close the third air passage; The ventilation and blowing system according to claim 11 or 12, wherein when the second required air volume is the maximum air volume of the second ventilation device, the second damper is controlled to close the fourth air duct.

14. The control means determining a first required air volume, which is an air volume of the air flow to be generated in the first air passage, from a detection result by the first air quality detection means; determining a second required air volume, which is an air volume of the air flow to be generated in the second air passage, from the detection result by the second air quality detection means; When the first required air volume is a maximum air volume of the first ventilation device that can be set by the control means, the first damper is controlled to close the third air passage; The ventilation and air supply system of claim 10, wherein when the second required air volume is the maximum air volume of the second ventilation device that can be set by the control means, the second damper is controlled to close the fourth air duct.

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