Ventilation system

Abstract

To provide a ventilation system that can optimize a ventilation state in a living room in accordance with an actual air environment in the living room.SOLUTION: A ventilation system (1) comprises: a first fan (20) capable of always ventilating a living room; a second fan (30) provided in the living room, and having lower ventilation capacity than that of the first fan; a third fan (40) provided in the living room, and having higher ventilation capacity than that of the first fan; detection means (5) for detecting an air environment in the living room; and control means (6). The control means perform ventilation control of the living room by selecting one pattern out of a weak ventilation pattern for operating only the first fan, a medium ventilation pattern for operating the first fan and the second fan, and a strong ventilation pattern for operating the first fan and the third fan, in accordance with the level of the air environment detected by the detection means.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a ventilation system, and more particularly to a ventilation system for a room to be ventilated by a continuous ventilation device. [Background technology]

[0002] In living / dining / kitchen rooms (living rooms including the kitchen and living / dining space) of homes equipped with a continuous ventilation system, ventilation using the continuous ventilation system and ventilation using a range hood fan (exhaust fan) installed in the kitchen may be performed simultaneously.

[0003] Although range hood fans are effective for immediately ventilating living, dining, and kitchen rooms, the exhaust volume of the range hood fan exceeds the volume of air supplied to each room by the continuous ventilation system, causing negative pressure in the house. For this reason, as disclosed in JP 2018-204884 A (Patent Document 1), a technology has been proposed that increases the volume of air supplied to the kitchen by using an electric damper in a continuous ventilation device when the range hood fan is operating.

[0004] In rooms where people gather, such as the living / dining / kitchen room in a house, an air purifier may be installed that adjusts its operating intensity depending on the detection results of pollutants such as dust and odors, as disclosed in JP 2015-124926 A (Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-204884 A [Patent Document 2] JP 2015-124926 A (Patent No. 6437195) Summary of the Invention [Problem to be solved by the invention]

[0006] Air purifiers such as those described in Patent Document 2 are activated when pollutants are detected in the living / dining / kitchen room, and can therefore purify the pollutants in the air appropriately. However, there are cases where the air environment deteriorates regardless of the presence or absence of pollutants in the air (for example, cases where the carbon dioxide concentration increases due to many people gathering together). With a normal continuous ventilation system, it is difficult to increase the ventilation air volume on a room-by-room basis, so in the past, when the air environment deteriorated, the only thing that could be done was to operate the range hood fan to forcibly exhaust the air in the room.

[0007] In Patent Document 1, the amount of air supplied for constant ventilation is adjusted by controlling the electric damper according to the operating status of the range hood fan, but control according to the actual air environment is not performed. In other words, ventilation control to improve the air environment is not performed.

[0008] The present invention has been made to solve the above-mentioned problems, and its object is to provide a ventilation system that can optimize the ventilation conditions of a room according to the actual air environment in the room. [Means for solving the problem]

[0009] A ventilation system according to an aspect of the present invention is a ventilation system for a room to be ventilated by a continuous ventilation device, and includes a first fan mounted on the continuous ventilation device and capable of constantly ventilating the room, a second fan provided in the room and having a lower ventilation capacity than the first fan, a third fan provided in the room and having a higher ventilation capacity than the first fan, detection means for detecting the air environment of the room, and control means. The control means controls ventilation of the room by selecting one of a weak ventilation pattern in which only the first fan is operated, a medium ventilation pattern in which the first and second fans are operated, and a strong ventilation pattern in which the first and third fans are operated, according to the level of the air environment detected by the detection means.

[0010] Preferably, the detection means detects the carbon dioxide concentration of the air in the room. By detecting the carbon dioxide concentration, the air environment in the room can be detected more accurately than by detecting the number of people in the room using a human presence sensor, etc. Also, there is an advantage that hunting can be prevented compared to a configuration using a human presence sensor.

[0011] Preferably, the medium ventilation pattern includes, in order of decreasing airflow, a pattern in which the first fan and the second fan are operated at low speed, a pattern in which the first fan is operated at low speed and the second fan is operated at high speed, and a pattern in which the first fan and the second fan are operated at high speed.

[0012] Preferably, the strong ventilation pattern includes, in ascending order of air volume, a pattern in which the first fan and the third fan are operated at low volume, and a pattern in which the first fan is operated at low volume and the third fan is operated at medium volume.

[0013] It is desirable that the control means includes a determination means for determining the level of the air environment detected by the detection means at a predetermined time interval, and an operation control means for selecting a ventilation pattern corresponding to a level one level higher than the current level when the current level determined by the determination means is the same as a previously determined past level, and for operating an equipment according to the selected ventilation pattern.

[0014] It is also desirable that the control means includes an operational control means for switching the current ventilation pattern when the current level determined by the determination means is two or more levels lower than the previously determined past level.

[0015] Typically, the living room is a room that includes a kitchen space and a living / dining space. In this case, the second fan is an exhaust fan mounted in the air purifier, and the third fan is an exhaust fan built into the range hood. Effect of the Invention

[0016] According to the present invention, the ventilation state of a room can be optimized according to the actual air environment in the room. [Brief description of the drawings]

[0017] [Figure 1] 1A and 1B are diagrams illustrating an overview of a ventilation system according to an embodiment of the present invention. [Diagram 2] FIG. 1A is a block diagram showing an example of the configuration of a ventilation system according to an embodiment of the present invention, and FIG. 1B is a diagram showing multiple ventilation patterns executed in the ventilation system according to an embodiment of the present invention. [Diagram 3] FIG. 1A is a diagram showing specific examples of switching thresholds (carbon dioxide concentrations) for the operation modes of each fan in an embodiment of the present invention, and FIG. 1B is an image diagram of the operation control of each device performed by a control device in an embodiment of the present invention. [Figure 4] 5 is a flowchart showing an operation example of the ventilation system according to the embodiment of the present invention. [Diagram 5] FIG. 11 is a diagram for explaining a method of switching ventilation patterns corresponding to the first and second modified examples of the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and their description will not be repeated.

[0019] (About the overview) First, an overview of a ventilation system 1 according to an embodiment of the present invention will be described with reference to Fig. 1. The ventilation system 1 is a system for ventilating a target room 11 by a continuous ventilation device (24-hour ventilation system) 2 just enough according to the air environment in the room.

[0020] The constant ventilation device 2 of this embodiment employs, for example, a third type ventilation method in which only exhaust air is exhausted mechanically. In this case, as shown in FIG. 1(A), a natural air intake 21 is provided on the outer wall of the living room 11, and an exhaust fan 20 is provided on the ceiling of a non-living room 12 such as a corridor. By driving the exhaust fan 20, the air in the living room 11 is sucked out to the non-living room 12 side, and the living room 11 becomes negative pressure, so that outside air is taken into the living room 11 through the natural air intake 21. In this way, constant ventilation of the living room 11 is performed. The constant ventilation device 2 may be a first type ventilation method, and may be provided with an intake fan 22 in addition to the exhaust fan 20. As shown in the figure, the intake fan 22 may be provided only on the upper floors (2nd floor or higher) of the house. Alternatively, the constant ventilation device 2 may be a second type ventilation method in which only intake air is exhausted mechanically.

[0021] FIG. 1(B) shows an example of the configuration of the living room 11. The living room 11 is an "LDK room" including a kitchen space 11a having a system kitchen (cabinet) 13 equipped with a stove, a dining space 11c adjacent to the kitchen space 11a, and a living space 11d adjacent to the dining space 11c. The dining space 11c and the living space 11d are an integrated space (living-dining space), and both spaces 11c and 11d are collectively referred to as "LD space 11b" below. The kitchen space 11a and the LD space 11b are adjacent to each other without a partition. In the illustrated example, the system kitchen 13 in the kitchen space 11a is a so-called facing kitchen, and is provided at the boundary with the LD space 11b (dining space 11c) facing the LD space 11b. Note that the kitchen space 11a, the dining space 11c, and the living space 11d are not limited to being provided along a certain direction.

[0022] As shown by hatching in Fig. 1(B), a range hood 4 incorporating a forced exhaust fan 40 is provided above the stove in the system kitchen 13 in the kitchen space 11a. In addition, the living / dining space 11b is provided with a natural air intake vent 21 and an air purifier 3. The air purifier 3 is attached to the ceiling of the living / dining space 11b.

[0023] The air purifier 3 has a function of exhausting the air in the living room 11 drawn in through the air intake to the outside, and has a built-in exhaust fan 30. The air purifier 3 purifies the air in the living room 11 drawn in through the air intake using a filter, and returns the purified air to the living room 11, thereby purifying the air in the living room 11. The air purifier 3 may have an air circulation fan (not shown) in addition to the exhaust fan 30.

[0024] In this way, the living room 11 can be ventilated by three types of ventilation means: an exhaust fan 20 mounted on the constant ventilation device 2 (hereinafter referred to as the "constant ventilation fan 20"), an exhaust fan 30 mounted on the air purifying device 3 (hereinafter referred to as the "purifying fan 30"), and a ventilation fan 40 of the range hood 4 (hereinafter referred to as the "range fan 40").

[0025] The continuous ventilation fan 20 has at least two operation modes: "weak operation" and "strong operation." The continuous ventilation fan 20 is usually operated in weak operation, and when the room temperature detected by the temperature sensor 23 is high (e.g., 35°C or higher), the operation mode is switched to strong operation. The temperature sensor 23 is provided, for example, in the non-occupied room 12.

[0026] The air purifying device 3 normally operates the purification fan 30 only when pollutants are detected by the dirt sensor 31 arranged near the air intake, and stops operating the purification fan 30 when the pollutants are removed. The pollutants include at least one of dust, odor, and water vapor (humidity). Alternatively, they may include all of these. The purification fan 30 has at least two operating modes: "weak operation" and "strong operation." The ventilation capacity of the purification fan 30 is lower than that of the constant ventilation fan 20 even in the strong operation mode.

[0027] The range fan 40 normally operates at a user-specified intensity only when the user instructs ventilation by operating a button or the like. The range fan 40 typically has three operating modes: "low operation", "medium operation", and "high operation". The ventilation capacity of the range fan 40 is higher than that of the constant ventilation fan 20 even in the low operation mode.

[0028] Generally, the constant ventilation fan 20, the purification fan 30, and the range fan 40 operate independently of each other. Therefore, there may be cases where ventilation is insufficient to optimize the air environment, or conversely, excessive ventilation occurs.

[0029] Therefore, the ventilation system 1 of this embodiment includes a sensor 5 that detects the air environment in the living room 11, and a control device 6 (FIG. 2(A)) that comprehensively controls three types of ventilation means (a continuous ventilation fan 20, a purification fan 30, and a range fan 40) according to the level of the air environment detected by the sensor 5. The sensor 5 is, for example, a CO2 sensor that detects the carbon dioxide concentration.

[0030] The configuration and operation of the ventilation system 1 will be described in detail below.

[0031] (Example of ventilation system configuration) FIG. 2(A) is a block diagram showing an example of the configuration of the ventilation system 1.

[0032] As shown in FIG. 2(A), the ventilation system 1 includes a CO2 sensor 5 that detects the carbon dioxide concentration in the living room 11, and a control device 6. The control device 6 is electrically connected to the continuous ventilation fan 20, the purification fan 30, and the range fan 40. The CO2 sensor 5 is preferably installed in the living / living space 11b, as shown in FIG. 1(B). The purification fan 30 is located away from the kitchen space 11a, for example, between the dining space 11c and the living space 11d. The natural air supply vent 21 is located away from the kitchen space 11a, in the exterior wall or window sash on the living space 11d side.

[0033] The control device 6 includes a storage unit 61 that stores various information and programs, a determination unit 62 that determines the level of carbon dioxide concentration detected by the CO2 sensor 5, and an operation control unit 63 that controls the operation of the three types of fans 20, 30, 40 according to the carbon dioxide concentration level determined by the determination unit 62. The functions of the determination unit 62 and the operation control unit 63 can be executed by a processor.

[0034] The memory unit 61 stores ventilation pattern information for each carbon dioxide concentration level in advance, and the operation control unit 63 selects one or more (two) devices to operate from the three types of fans 20, 30, 40 in accordance with the ventilation pattern information. Also, the operation intensity of the selected device is set in accordance with the ventilation pattern information.

[0035] Fig. 2(B) shows a specific example of the ventilation pattern information. As shown in Fig. 2(B), there are, for example, six ventilation patterns by the ventilation system 1. In this embodiment, there are first to sixth carbon dioxide concentration levels.

[0036] The first ventilation pattern is a pattern in which only the constant ventilation fan 20 is operated in the weak operation mode. The second ventilation pattern is a pattern in which both the constant ventilation fan 20 and the purification fan 30 are operated in the weak operation mode. The third ventilation pattern is a pattern in which the constant ventilation fan 20 is operated in the strong operation mode, and the purification fan 30 is operated in the weak operation mode. The fourth ventilation pattern is a pattern in which both the constant ventilation fan 20 and the purification fan 30 are operated in the strong operation mode. The fifth ventilation pattern is a pattern in which both the constant ventilation fan 20 and the range fan 40 are operated in the weak operation mode. The sixth ventilation pattern is a pattern in which the constant ventilation fan 20 is operated in the weak operation mode, and the range fan 40 is operated in the medium operation mode.

[0037] The ventilation volume in the first ventilation pattern is the smallest, for example 80 m 3The ventilation air volume increases from the second ventilation pattern onwards, and the ventilation air volume for each pattern is as follows: Second ventilation pattern: 116 m 3 / h (80m 3 / h+36m 3 / h), third ventilation pattern: 146m 3 / h (110m 3 / h+36m 3 / h), 4th ventilation pattern: 170m 3 / h (110m 3 / h+60m 3 / h), 5th ventilation pattern: 240m 3 / h (80m 3 / h+160m 3 / h), 6th ventilation pattern: 380m 3 / h (80m 3 / h+300m 3 / h) is assumed.

[0038] The threshold value (carbon dioxide concentration) for switching the ventilation pattern is determined taking into consideration the expected number of people in the room 11. The ventilation air volume for each ventilation pattern is set to 30 m per person. 3 Calculated as / h.

[0039] 3A shows the switching threshold (carbon dioxide concentration) of the operation mode for each of the fans 20, 30, and 40. The continuous ventilation fan 20 normally operates in the weak operation mode, and the threshold for switching from the weak operation mode to the strong operation mode is, for example, 1200 ppm.

[0040] The threshold value for switching the operation state of the purification fan 30 from the stopped state to the low operation mode is, for example, 1000 ppm. The threshold value for switching the operation state of the purification fan 30 from the low operation mode to the high operation mode is, for example, 1500 ppm.

[0041] The threshold value for switching the operation state of the range fan 40 from the stopped state to the low operation mode is, for example, 2000 ppm. The threshold value for switching the operation state of the range fan 40 from the low operation mode to the medium operation mode is, for example, 3000 ppm.

[0042] Fig. 3(B) is an image diagram of the operation control of each device executed by the control device 6. The ventilation system 1 aims to improve the deterioration of the air environment caused by multiple people gathering together (such as stagnation of air due to crowded conditions) even in cases where the air in the living room 11 does not contain pollutants. Therefore, as shown in this figure, it is desirable not to set the operating state of the range fan 40 to the strong operating mode even if the carbon dioxide concentration is high. This makes it possible to prevent hyperventilation.

[0043] Also, from the viewpoint of preventing hyperventilation, it is desirable to return the continuous ventilation fan 20 from the strong operation mode to the weak operation mode when the range fan 40 is turned on, even if the carbon dioxide concentration is 1200 ppm or more. It is desirable to stop the purification fan 30 when the range fan 40 is turned on, even if the carbon dioxide concentration is 1500 ppm or more. Alternatively, the operation mode of the purification fan 30 may be returned from the strong operation mode to the weak operation mode.

[0044] (Ventilation system operation) Fig. 4 is a flowchart showing an operation example of the ventilation system 1. The process shown in Fig. 4 is performed by the control device 6 at predetermined time intervals. The time interval is preferably 5 minutes or more and 15 minutes or less, for example, 10 minutes.

[0045] The determination unit 62 of the control device 6 acquires the carbon dioxide concentration detected by the CO2 sensor 5 (step S1), and determines which of levels 1 to 6 the carbon dioxide concentration level corresponds to. Note that the value used to determine the carbon dioxide concentration level is preferably an average value for 10 minutes (the time interval for the level determination process).

[0046] If the carbon dioxide concentration is less than 1000 ppm and the carbon dioxide concentration level is the first level (YES in step S2), the operation control unit 63 controls the equipment with the "first ventilation pattern." That is, the constant ventilation fan 20 is operated at low speed (step S3), the purification fan 30 is stopped (step S4), and the range fan 40 is stopped (step S5). As shown in FIG. 2(B), the expected number of people for the first level is two or less. Note that, when the purification fan 30 is stopped, the air circulation fan of the air purifier 3 may continue to operate. The same applies below.

[0047] If the carbon dioxide concentration is equal to or higher than 1000 ppm and lower than 1200 ppm, and the carbon dioxide concentration level is the second level (YES in step S6), the operation control unit 63 controls the equipment with the "second ventilation pattern." That is, the constant ventilation fan 20 is operated at low strength (step S7), the purification fan 30 is operated at low strength (step S8), and the range fan 40 is stopped (step S9). As shown in FIG. 2(B), the expected number of people for the second level is 2 to 3 people.

[0048] When the carbon dioxide concentration is equal to or higher than 1200 ppm and lower than 1500 ppm, and the carbon dioxide concentration level is the third level (YES in step S10), the operation control unit 63 controls the equipment with the "third ventilation pattern." That is, the constant ventilation fan 20 is operated at high strength (step S11), the purification fan 30 is operated at low strength (step S12), and the range fan 40 is stopped (step S13). As shown in FIG. 2(B), the expected number of people for the third level is 3 to 4 people.

[0049] If the carbon dioxide concentration is equal to or higher than 1500 ppm and lower than 2000 ppm, and the carbon dioxide concentration level is the fourth level (YES in step S14), the operation control unit 63 controls the equipment with the "fourth ventilation pattern." That is, the constant ventilation fan 20 is operated at high power (step S15), the purification fan 30 is operated at high power (step S16), and the range fan 40 is stopped (step S17). As shown in FIG. 2(B), the expected number of people for the fourth level is 4 to 5 people.

[0050] If the carbon dioxide concentration is 2000 ppm or more and less than 3000 ppm, and the carbon dioxide concentration level is the fifth level (YES in step S18), the operation control unit 63 controls the equipment with the "fifth ventilation pattern." That is, the constant ventilation fan 20 is operated at low power (step S19), the purification fan 30 is stopped (step S20), and the range fan 40 is operated at low power (step S21). As shown in FIG. 2(B), the expected number of people for the fifth level is 5 to 8 people.

[0051] If the carbon dioxide concentration is 3000 ppm or more and the carbon dioxide concentration level is the sixth level (NO in step S18), the operation control unit 63 controls the equipment with the "sixth ventilation pattern." That is, the constant ventilation fan 20 is operated at low power (step S22), the purification fan 30 is stopped (step S23), and the range fan 40 is operated at medium power (step S24). As shown in FIG. 2(B), the expected number of people for the sixth level is 8 to 12.

[0052] According to the above control method, the ventilation volume of the living room 11 can be increased without changing the configuration of the continuous ventilation device 2 equipped with the continuous ventilation fan 20. In addition, by determining a plurality of ventilation patterns according to the carbon dioxide concentration level, an optimal ventilation volume that is neither too much nor too little can be realized. In addition, when the carbon dioxide concentration becomes high, the device with the smallest ventilation capacity is operated first, so that a dramatic change in the environment can be prevented. Therefore, the occupants can spend their time comfortably in the living room 11.

[0053] (Variation 1) In this embodiment, the ventilation pattern is determined based only on the carbon dioxide concentration acquired in step S1 in Fig. 4, but it is preferable to make a decision to switch the ventilation pattern taking into consideration the past (immediately preceding) ventilation pattern. The switching decision in this modified example will be described with reference to Fig. 5.

[0054] For example, assume that the carbon dioxide concentration level detected at the previous control timing was the fourth level (not less than 1500 ppm and not more than 2000 ppm) and ventilation control was performed using the fourth ventilation pattern (indicated by diagonal lines in FIG. 5).

[0055] If the carbon dioxide concentration level detected at this control timing remains at the fourth level, it is assumed that the air environment will not improve significantly even if ventilation is performed for 10 minutes using the fourth ventilation pattern. In this case, the ventilation pattern will be switched to the next higher ventilation pattern, i.e., the fifth ventilation pattern ("Case 1" in Figure 5).

[0056] That is, when the current level determined by the determination unit 62 is the same as the previous level determined previously, the operation control unit 63 in this modification selects a ventilation pattern corresponding to a level one level higher than the current level, and operates the equipment according to the selected ventilation pattern. By performing such control, it is possible to effectively improve the air environment in the room 11 while suppressing hyperventilation.

[0057] (Variation 2) In a case where the carbon dioxide concentration level rises above the previous level (the air environment deteriorates), it is desirable to control the above-mentioned fans 20, 30, 40 with a ventilation pattern according to the detected carbon dioxide concentration level so as to avoid insufficient ventilation, but in a case where the carbon dioxide concentration level falls below the previous level (the air environment is improving), it is desirable to perform the following control in order to reliably improve the air environment.

[0058] As in the first modification, for example, it is assumed that the carbon dioxide concentration level detected at the previous control timing was the fourth level (1500 ppm or more and less than 2000 ppm) and ventilation control was performed with the fourth ventilation pattern (indicated by diagonal lines in FIG. 5). It is also assumed that the level before reaching the fourth level was lower than that.

[0059] In this modified example, even if the carbon dioxide concentration level detected at the current control timing is the third level, which is one level lower, ventilation control is continued with the fourth ventilation pattern. In a case where the carbon dioxide concentration level decreases, the ventilation pattern is not switched until the carbon dioxide concentration level is the second level, which is two levels lower. When the carbon dioxide concentration level is the second level, the ventilation pattern is switched from the fourth ventilation pattern to the second ventilation pattern ("Case 2" in FIG. 5).

[0060] That is, the operation control unit 63 in this modification switches the current ventilation pattern only when the current level determined by the determination unit 62 is two or more levels lower than the previous level determined previously. By performing such control, hunting can be prevented, and the comfort of the occupants can be improved.

[0061] (Other variations) In the present embodiment, an example has been described in which there are six ventilation patterns by the ventilation system 1, but the present invention is not limited to such an example. There may be at least three types of ventilation patterns: a "weak ventilation pattern (normal ventilation pattern)" in which only the constant ventilation fan 20 is operated, a "medium ventilation pattern" in which two devices, the constant ventilation fan 20 and the purification fan 30, are operated, and a "strong ventilation pattern" in which two devices, the constant ventilation fan 20 and the range fan 40, are operated.

[0062] The correspondence relationship with the first to sixth ventilation patterns in the above embodiment is as follows: the "weak ventilation pattern" corresponds to the first ventilation pattern. The "medium ventilation pattern" includes the second to fourth ventilation patterns in ascending order of air volume. The "strong ventilation pattern" includes the fifth to sixth ventilation patterns in ascending order of air volume.

[0063] In the present embodiment, an example has been described in which the three types of ventilation means for ventilating the living room 11 are composed of the constant ventilation fan 20, the purification fan 30, and the range fan 40, but the invention is not limited to such an example. However, it is preferable that the ventilation means include the constant ventilation fan 20 (first fan), an exhaust fan (second fan) having a lower ventilation capacity than the constant ventilation fan 20, and an exhaust fan (third fan) having a higher ventilation capacity than the constant ventilation fan 20.

[0064] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0065] 1 ventilation system, 2 continuous ventilation device, 3 air purifier, 4 range hood, 5 CO2 sensor, 6 control device, 11 living room, 11a kitchen space, 11b LD space (living / dining space), 20 continuous ventilation fan (first fan), 21 natural air intake, 30 purification fan (second fan), 40 range fan (third fan), 61 memory unit, 62 judgment unit, 63 operation control unit.

Claims

1. A ventilation system for a room to be ventilated by a continuous ventilation device, A first fan mounted in the constant ventilation device and capable of constantly ventilating the living room; a second fan provided in the living room and having a lower ventilation capacity than the first fan; a third fan provided in the living room and having a higher ventilation capacity than the first fan; A detection means for detecting an air environment in the room; a control means for selecting one of a weak ventilation pattern in which only the first fan is operated, a medium ventilation pattern in which the first fan and the second fan are operated, and a strong ventilation pattern in which the first fan and the third fan are operated, depending on the level of the air environment detected by the detection means, to perform ventilation control for the room.

2. The ventilation system according to claim 1 , wherein the detection means detects a carbon dioxide concentration of the air in the room.

3. The ventilation system of claim 1, wherein the medium ventilation pattern includes, in order of decreasing air volume, a pattern in which the first fan and the second fan are operated at low speed, a pattern in which the first fan is operated at low speed and the second fan is operated at high speed, and a pattern in which the first fan and the second fan are operated at high speed.

4. The ventilation system according to claim 1 , wherein the strong ventilation pattern includes, in ascending order of air volume, a pattern in which the first fan and the third fan are operated at low volumes, and a pattern in which the first fan is operated at low volumes and the third fan is operated at medium volumes.

5. The control means A determination means for determining the level of the air environment detected by the detection means at a predetermined time interval; 2. The ventilation system of claim 1, further comprising: an operation control means for selecting a ventilation pattern corresponding to a level one level higher than the current level when the current level determined by the determination means is the same as a previously determined past level, and for operating an equipment according to the selected ventilation pattern.

6. The control means A determination means for determining the level of the air environment detected by the detection means at a predetermined time interval; The ventilation system of claim 1, further comprising an operational control means for switching a current ventilation pattern when the current level determined by the determination means is two or more levels lower than a previously determined past level.

7. The living room is a room that integrally includes a kitchen space and a living / dining space, 2. The ventilation system according to claim 1, wherein the second fan is an exhaust fan mounted in an air purifying device, and the third fan is an exhaust fan built into a range hood.

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