JP5788254B2 - Ventilation system - Google Patents

Description

  The present invention relates to a ventilation system that ventilates air taken from outside through a duct and indoors, and more particularly, a system that controls a ventilation amount according to a person's occupancy status detected by a human sensor. About.

  In each indoor space in a building, it is necessary to perform ventilation to maintain a constant cleanliness of indoor air by replacing a predetermined amount of indoor air in which the concentration of carbon dioxide or the like is increased due to the presence of a person in the room with fresh outside air. In ventilation, it is required to change the amount of air according to the number of people in the indoor space, and in such ventilation, outside air is usually taken from the external space into the indoor space, and dirty air in the indoor space is removed from the outside. Use ventilation equipment that discharges air.

  In recent years, equipment that emphasizes energy saving has been adopted as such equipment for ventilation. In particular, outside air is taken in from the outside space, and this outside air is sent to the indoor space, while dirty air in the indoor space is taken in and discharged outside, and in the process, the outside air taken in from the outside and the room to be discharged There are increasing examples of using a ventilator that exchanges heat with the inside air to bring the temperature of the outside air close to the temperature of the room air and suppress the energy consumption required for adjusting the temperature of the outside air entering the room space. Examples of such a conventional ventilator include those disclosed in JP-A-5-223306 and JP-A-9-133386.

  The conventional ventilator is disposed in an indoor space or a ceiling space in the vicinity thereof, takes outside air from the outside space, and sends outside air to the indoor space, and takes in dirty air in the indoor space. In addition, the function of exhausting to the outside is combined into a single device, and the outside air taken in from the outside and the indoor air to be exhausted are exchanged by a heat exchanger inside the device, and the outside air temperature is adjusted. After adjusting the temperature to approach the room air temperature, it can be sent to the room space.

JP-A-5-223306 JP-A-9-133386

  Conventional ventilators are configured as described in each of the above patent documents. In the heat exchanger in the apparatus, the outside air and the indoor air are heat-exchanged, and the outside air temperature can be brought close to the room air temperature. The air conditioning load, that is, the energy required to adjust the outside air to the same temperature as the room air by the air conditioner in the indoor space can be greatly reduced, and energy saving can be achieved in terms of air conditioning.

  However, when adopting such a conventional heat exchange type ventilator in a building with many rooms such as a large office building or school, at least one ventilator is required per room. Therefore, it is necessary to install a large number of ventilators. Not only the cost of equipment, but also the maintenance costs such as periodic replacement of the filter on the inlet side of the heat exchanger, which must be performed for each ventilator, are large. Had the problem of becoming.

  On the other hand, in contrast to ventilation using a ventilation device for each room, outside air taken in from outside space can be sent to each indoor space via a duct from a central air conditioner, and ventilation by introducing outside air into the indoor space can be performed conventionally Widely known from. Even in the case of such a centrally managed system, the air volume control device is controlled by the number of people in the room detected by the sensors provided in each room space, and the amount of outside air supplied to each room space is adjusted, depending on the number of people in the room. In addition to ensuring an appropriate supply of outside air, when the number of people in the room is small, it is possible to reduce the air-conditioning load and save energy by preventing excessive outside air from being taken in.

  However, in order to realize energy saving with such a system, the control unit calculates the outside air supply amount according to the number of people in the room obtained by the sensor, and based on that, controls the central air conditioner and each indoor space. It requires complicated control processing that is compatible with other controls such as indoor temperature adjustment, such as damper opening adjustment control of the corresponding variable air volume device, so that the control system becomes complicated and costs increase Had problems.

  The present invention has been made to solve the above-mentioned problems, and distributes and introduces outside air collected from outside into a plurality of indoor spaces via ducts, and the indoor air according to the number of people in each indoor space. Adjust the amount of outside air to be introduced for each space, and adjust the amount of outside air supplied to the duct according to the increase or decrease in the amount of outside air toward each room in the duct. The purpose is to provide a ventilation system that can reduce the cost of ventilation by reducing energy consumption in the entire ventilation system while making the ventilation amount of the airflow appropriate.

A ventilation system according to the present invention is a ventilation system that ventilates an indoor space by supplying outside air taken in from the outside space to the indoor space, and is provided with an intake of outside air facing the outside space and a plurality of indoor spaces. facing each communicating with each disposed a plurality of air outlets, and a duct for dispensing the respective outside air that is introduced from the external space to the outlets of the indoor space, is connected to the air inlet near the duct, A blower that sends outside air to each air outlet through the duct at a predetermined pressure, and an outdoor air that is arranged for each air outlet as being interposed in the middle of the duct at a position near each air outlet, and goes to the indoor space via the air outlet A constant air volume adjustment unit that adjusts the flow rate of air to a preset value, an exhaust passage that communicates with the indoor space and the external space, guides the indoor air to the external space, and a plurality of indoor air spaces that are disposed within a predetermined detection range. In A motion sensor for detecting the presence or absence of a human that, from the detected state of presence of a person in each person presence sensor in the indoor space, the outside air in each constant air volume adjusting unit corresponding to a plurality of air outlets of the front Stories interior A ventilation amount control unit that performs control to switch the flow rate to a predetermined flow rate, a pressure sensor that detects pressure in the duct, and a blower control unit that adjusts the amount of outside air supplied by the blower based on the detection result of the pressure sensor, If the ventilation amount control unit can be considered that the number of people in the indoor space is greater than a predetermined threshold from the detection state of each human sensor, the constant air volume adjustment corresponding to each air outlet in the indoor space When the outside air flow rate in the section is set to a predetermined maximum flow rate and it can be considered that there is a predetermined number of people below the threshold in the indoor space, The outside air flow rate of the constant air flow rate adjustment unit corresponding to the maximum air flow rate is set to the maximum flow rate, while the outside air flow rate in the constant air flow rate adjustment unit corresponding to at least one or more air outlets excluding the predetermined air flow rate is set to 0 or a predetermined minimum flow rate In addition, when the number of people in the indoor space is 0, the outside air flow rate of the constant air flow rate adjusting unit corresponding to the predetermined air outlet is set to a predetermined minimum flow rate, while the predetermined air outlet in the indoor space is The outside air flow rate of the constant air volume adjusting unit corresponding to the other air outlets is set to zero .

  As described above, according to the present invention, the outside air taken in from the external space is sent to the air outlet of each indoor space through the duct by the blower, and the constant air volume adjusting unit is disposed on the upstream side of the air outlet, In addition, the presence sensor in the indoor space is detected by a human sensor provided in the indoor space, and the number of people in the indoor space is estimated by the control unit. When the carbon dioxide concentration is likely to rise, the constant air volume adjustment unit is set in a state where a sufficient amount of outside air passes through the indoor space, while the number of people in the room is less than a few and a large amount of outside air is required to be introduced. In a situation where it is not possible to prevent the poor ventilation in the indoor space by setting the constant air volume adjustment unit to a state that suppresses the passage of outside air to the indoor space side, and setting the ventilation amount of the indoor space to an optimal state according to the situation In addition to maintaining good indoor air conditions, If the number of people in the inner space is small, with reduced ventilation while continuing the ventilation can be reduced air conditioning loads of the indoor space. In addition, by controlling the blower in response to the change in duct pressure accompanying the operation switching of the constant air flow rate adjustment unit, the blower output can also be suppressed, the energy consumption related to ventilation can be reduced, and the efficiency is improved with a simple control configuration. The system can be operated well and the cost of ventilation can be reduced. Furthermore, it is not necessary to connect and link the central fan control and the control based on the number of people in the constant air flow rate adjustment unit corresponding to each indoor space, so that the control system can be operated independently. It is easy to add and reduce rooms for ventilation adjustment.

  Further, in the ventilation system according to the present invention, if necessary, each human sensor in the same indoor space is arranged so that the sensor detection ranges do not overlap each other, and the ventilation amount control unit includes each human sensor in the indoor space. The number of people in the indoor space is estimated from the frequency of change per predetermined time in the waveform of the signal that detects the presence of a person in the room, and if the number of people in the room is greater than a predetermined threshold, the outside air flow rate in the constant air volume adjustment unit is On the other hand, when the number of people in the room is less than a predetermined threshold, the outside air flow rate in the constant air flow rate adjustment unit is controlled to 0 or the minimum flow rate.

  As described above, according to the present invention, when the number of people in the indoor space increases, the detection amount by the human sensor increases, and the ventilation amount control unit uses the phenomenon of the person appearing in the output signal waveform of the human sensor. Estimate the number of people in the indoor space based on the frequency of changes due to detection, and switch the operating state of the constant air volume adjustment unit based on the estimated value of the number of people in the room. It is possible to grasp the approximate number of people in the room appropriately from the human sensor that detects the air flow, and use it for control. Control can be executed, the number of installations can be reduced by using the human sensor more efficiently, and the cost of the system can be reduced.

In addition, the ventilation system according to the present invention includes a temperature adjusting unit that adjusts the temperature of the outside air taken in from the external space, and is detected by the pressure sensor. When the constant air flow rate adjustment unit corresponding to each outlet in each indoor space is switched to a state where the supply flow rate of the outside air to the indoor space is reduced, The state in which the temperature adjustment is stopped and the supply flow rate of the outside air to the indoor space is suppressed corresponds to the predetermined air outlet when the number of people in all the indoor spaces having the air outlets communicating with the duct is 0. In this state, the outside air flow rate of the constant air volume adjusting unit is set to a predetermined minimum flow rate, and the outside air flow rate of the constant air volume adjusting unit corresponding to the air outlets other than the predetermined air outlets is set to zero .

As described above, according to the present invention, in any indoor space, when the human sensor detects the number of people in the room 0 , and the ventilation amount control unit makes the constant air flow rate adjustment unit suppress the outside air flow into the indoor space. The pressure in the duct that has risen with the transition to this state is detected by the pressure sensor, and based on the detection of this pressure, the temperature adjustment of the outside air supplied by the blower is temporarily stopped, so that each indoor space If the ventilation is performed in ventilation of minimal, skip outside air temperature adjustment is almost not required, it is possible to reduce the external energy supplied to the temperature regulation, further energy saving To reduce the cost of ventilation.

It is a schematic structure figure of a ventilation system concerning one embodiment of the present invention. It is a principal part schematic explanatory drawing of the indoor space to which the ventilation system which concerns on one Embodiment of this invention is applied. It is a block diagram of the ventilation system which concerns on one Embodiment of this invention. It is a schematic explanatory drawing of the maximum ventilation state in the ventilation system which concerns on one Embodiment of this invention. It is a schematic explanatory drawing of the intermediate ventilation state in the ventilation system which concerns on one Embodiment of this invention. It is a schematic explanatory drawing of the minimum ventilation state in the ventilation system which concerns on one Embodiment of this invention.

  Hereinafter, a ventilation system according to an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, an example will be described in which ventilation is performed for each indoor space in a situation where individual air conditioning is performed by an air conditioner installed in each of a large number of indoor spaces in a building.

  In each of the drawings, the ventilation system according to the present embodiment distributes and supplies outside air taken in from the external space 80 to the building to the air outlets 71 and 72 of a number of indoor spaces 70 in the building, The blower 20 is connected to the vicinity of the outside air inlet, and sends the outside air to the air outlets 71 and 72 through the duct 10 at a predetermined pressure, and is disposed in the middle of the duct 10 in the vicinity of the air outlets 71 and 72. Constant air volume adjusting units 11, 12, an exhaust passage 73 disposed between the indoor space 70 and the external space 80 and communicating with each of the spaces, and a plurality of indoor passages 70. A human sensor 30 that detects the presence or absence of a person in the detection range, and the operation state of the constant air volume adjusting units 11 and 12 are switched to the indoor space 70 according to the detection state of the human sensor 30. A ventilation amount control unit 40 that changes the supply amount of outside air, a pressure sensor 50 that detects the pressure in the duct 10, and a blower control that adjusts the amount of outside air supplied by the blower 20 based on the detection result of the pressure sensor 50. And a unit 60.

  The duct 10 communicates with an outside air inlet facing the external space 80 in the building and a plurality of air outlets 71 and 72 arranged facing the indoor spaces 70, respectively. It is arranged in the building as a plurality of branched pipes between the 70 outlets 71 and 72.

  The duct 10 allows the outside air introduced from the external space 80 to reach the air outlets 71 and 72 connected to the end portion on the indoor space 70 side, thereby blowing the outside air from the air outlets 71 and 72 to the indoor space 70 for ventilation. Can be performed.

The blower 20 is disposed in the middle of the duct so as to be able to pump outside air toward the air outlets 71 and 72 of each indoor space 70. The blower mechanism itself is a known mechanism and will not be described in detail.
In the vicinity of the blower 20, a temperature adjusting unit 21 for adjusting the temperature of the outside air taken in from the external space 80 is disposed, and the outside air immediately after taking in is heated and / or cooled, so that the summer, winter, It is a mechanism that regulates the air conditioning load by adjusting the temperature to a predetermined temperature in each intermediate season and preventing an excessive temperature difference between the outside air introduced into the indoor space and the set temperature of the air conditioning in the indoor space. .

  The constant air volume adjusters 11 and 12 have a built-in sensor for detecting the passing air speed and a damper for adjusting the opening, and perform adjustment control so as to maintain a preset air volume even when the static pressure of the duct changes. Since this is a known apparatus, detailed description thereof is omitted. The constant air volume adjusting units 11 and 12 receive a control signal from the ventilation volume control unit 40, change the set air volume, and set the flow rate (air volume) of the outside air toward the indoor space to a preset maximum flow rate, 0 or It will be adjusted in two steps with the minimum flow rate.

  For example, when two air outlets 71 and 72 are installed facing the indoor space 70, the occupancy is increased from the maximum ventilation state where the number of people in the room is large and the two constant air volume adjustment units 11 and 12 are at the maximum flow rate. When the number of persons reaches a small number, the constant air flow rate adjustment unit 11 communicating with one of the air outlets 71 sets the flow rate of the outside air toward the indoor space to 0 by the control of the ventilation amount control unit 40, whereas the other The constant air volume adjusting unit 12 that communicates with the outlet 72 does not change the flow rate of the outside air toward the indoor space at the maximum flow rate, and the outside air is blown out only from the other outlet 72 and is used for ventilation. State (intermediate ventilation state) is obtained. Furthermore, in the situation where the number of people in the room becomes zero, the constant air volume adjustment unit 12 communicating with the other air outlet 72 controls the flow rate of the outside air toward the indoor space to the minimum flow rate by the control by the ventilation amount control unit 40. Thus, the indoor space is in a minimum ventilation state in which the necessary minimum outside air is blown out only from the other outlet 72 (see FIG. 6). It is a mechanism that can obtain three different levels of ventilation.

  The exhaust passage 73 is a gap provided at the lower part of the door or door serving as a doorway for people to the indoor space, and communicates with both the indoor space 70 and the external space 80 to introduce outside air through the duct 10. Thus, as the pressure in the indoor space 70 becomes higher than that in the external space 80, a part of the air in the indoor space 70 is discharged toward the external space 80. The structure itself is the same as that of a known facility used for discharging indoor air to the outside space in such ventilation, and detailed description thereof is omitted.

  The human sensor 30 is a known pyroelectric human body detection sensor that detects a change in incident infrared rays accompanying a human movement and outputs an electrical signal, and a detailed description thereof is omitted. In the human sensor 30, the amount of protrusion from the ceiling surface of the detection portion is adjusted to the ceiling of the indoor space 70, and the detection range of the sensor in the indoor space 70 is obtained with an appropriate size, and the detection ranges are mutually different. A plurality of signals are arranged so as not to overlap each other even though they are close to each other, and signals output from each are input to the ventilation amount control unit 40.

  The ventilation amount control unit 40 receives the detection signals of the human sensors 30, identifies the presence / absence of a person in the detection range of the human sensors 30 from the detection signals, and The magnitude of the number of people in the indoor space 70 is estimated from the frequency of change per predetermined time in the waveform of the signal that detects the presence of a person, and the number of people in the room is a predetermined threshold, that is, the carbon dioxide in the air for each indoor space. The lower limit value of the number of people in the room where the carbon concentration is likely to rise, and if there is more, the outside air flow rate in the constant air volume adjustment units 11 and 12 is set to the maximum flow rate, while if the number of people in the room is less than the threshold, the constant air volume adjustment Control to make the outside air flow rate in the sections 11 and 12 0 or the minimum flow rate is performed.

  As the number of people in the indoor space 70 increases, the number of opportunities for detection by the human sensor 30 also increases as compared to the case where the number of people in the room 70 is small, and the frequency of changes accompanying detection of people appearing in the output signal waveform of the human sensor 30 increases. Therefore, the ventilation amount control unit 40 analyzes the frequency of change in the sensor output signal waveform and estimates the number of people in the room. For example, the ventilation amount control unit 40 is configured so that the number of people corresponding to the lower limit of the number of people in the room where the concentration of carbon dioxide in the air in each indoor space 70 is likely to increase is present in advance. The change frequency of the output signal waveform is recorded, the frequency of the change accompanying the detection of the person appearing in the output signal waveform of the human sensor 30 in the actual indoor space 70 is acquired and compared, and the actual frequency is determined from the magnitude relationship. It is determined whether the number of people in the room exceeds the threshold, that is, the lower limit value of the number of people in the room where the concentration of carbon dioxide in the air is likely to increase.

  Appropriately knows the number of people in the room from the output signal of the human sensor that detects only the presence or absence of humans and uses it for control, so that it can be appropriately present in the indoor space 70 without using many human sensors. Control of the constant air flow rate adjustment units 11 and 12 according to the number of persons to be performed can be executed by the ventilation amount control unit 40, and the number of the presence sensors 30 can be reduced with respect to the number of people in the room by such efficient use.

  The blower control unit 60 starts or stops the blowing operation of the blower 20 based on a command from the outside, while the pressure sensor 50 disposed at a predetermined location in the duct 10 detects the pressure in the duct. The output signal is received, the supply capacity of the blower 20 is increased or decreased based on the magnitude of the pressure in the duct that can be discriminated from this signal, and the amount of outside air supplied to each of the outlets 71 and 72 through the duct 10 is adjusted. To do.

  When the constant air volume adjustment units 11 and 12 corresponding to each indoor space are switched from the maximum flow rate state to the minimum flow rate state or the closed state (the state where the flow rate is 0) due to the number of people in the room, the pressure in the duct increases and vice versa. In addition, when the constant air volume adjusting units 11 and 12 are switched from the minimum flow rate state or the closed state to the maximum flow rate state due to an increase in the number of people in the indoor space, the pressure in the duct decreases. When the downstream constant air flow rate adjustment units 11 and 12 are in the minimum flow rate state or the closed state, the blower 20 side may have a small outside air supply capacity, and conversely, the constant air flow rate adjustment units 11 and 12 are in the maximum flow rate state. In this case, since it is necessary to increase the outside air supply capability on the blower 20 side, the pressure sensor 50 detects a change in the duct internal pressure corresponding to the change in the constant air flow rate adjustment units 11 and 12, and the blower By controlling the blower 20 with the control unit 60, the operation of the blower 20 can be made to appropriately correspond to the state of the constant air flow rate adjustment units 11 and 12 with an extremely simple control mechanism, and wasteful outside air can be supplied. Become.

  Next, the adjustment operation of the ventilation state in the ventilation system based on the said structure is demonstrated. First, when a large number of people are present in the indoor space 70 in a steady state where the blower 20 supplies outside air to each indoor space side through the duct 10, the presence of the person is detected by the human sensor 30 in the indoor space 70. Two constant airflow adjustments corresponding to this indoor space are detected and it is recognized by the ventilation amount control unit 40 that there is a person exceeding the threshold (for example, 10 people) in the indoor space 70. Each of the parts 11 and 12 is in a maximum flow rate state, and allows the outside air to pass to each outlet side with a sufficient flow rate. And from each blower outlet 71 and 72, sufficient amount of outside air which implement | achieves the ventilation volume corresponding to the number of people in a room will be in the maximum ventilation state introduced into indoor space (refer FIG. 4).

  At this time, the pressure of the indoor space 70 is increased by the introduction of the outside air from the air outlets 71 and 72, and the air that originally exists in the indoor space 70 is pushed out of the indoor space 70, and the external space is passed through the exhaust passage 73. By flowing out to 80, ventilation, that is, replacement of a part of indoor air having a high carbon dioxide concentration with the outside air is realized.

  While such ventilation continues, people in the indoor space 70 move out of the space, and the number of people in the indoor space becomes a small number of people who are unlikely to increase in carbon dioxide concentration in the air, If it is recognized by the ventilation amount control unit 40 that there is a person below the threshold of the number of people in the indoor space 70 through detection of the person by the human sensor 30 in the indoor space 70, the ventilation amount control unit 40 One of the two constant air flow rate adjustment units 11 and 12 is closed, and the other maintains the maximum flow rate as it is. Thus, the indoor space is in an intermediate ventilation state in which outside air is introduced only from the other outlet 72 (see FIG. 5). In this state, an amount of outside air corresponding to the small number of people in the room is introduced into the indoor space, and a part of the air originally present in the indoor space 70 flows out to the external space 80, and the air in the indoor space is good. Maintained.

  At this time, since the amount of outside air introduced into the indoor space 70 is also reduced, the air conditioning load can be reduced when air conditioning is performed in the indoor space 70 by the air conditioner 75. In other words, the amount of outside air flowing in can reduce the energy for air conditioning that is spent to bring outside air that flows in at a temperature different from the temperature of the room air closer to the room air temperature.

  Furthermore, when ventilation continues, all the people in the indoor space 70 move out of the space, and the number of people in the indoor space is 0, that is, the indoor space becomes unmanned, the human feeling of the indoor space 70 If no sensor is detected by the sensor 30 and the ventilation amount control unit 40 determines that no person is present in the indoor space 70, the ventilation amount control unit 40 closes one of the two constant air volume adjustment units 11 and 12. While keeping the state, the other is changed to the minimum flow state. As a result, the indoor space is in a minimum ventilation state in which a small amount of outside air is introduced only from the other outlet 72 (see FIG. 6). Even in this state, a minimum amount of outside air is introduced into the indoor space, and a part of the air originally existing in the indoor space 70 flows out to the external space 80, so that the air in the indoor space is maintained in a good state. The

  In order to change the ventilation state from the maximum ventilation state to the intermediate ventilation state and further to the minimum ventilation state by the control by the ventilation amount control unit 40 as described above, each constant air volume adjustment unit 11, 12 is switched from the maximum flow state to the minimum flow state or closed. When the state is switched, the pressure loss with respect to the outside air toward the corresponding indoor space 70 of the constant air volume adjusting units 11 and 12 increases, and the pressure in the duct 10 increases accordingly. The change in the duct internal pressure based on the change in the constant air volume adjusting units 11 and 12 is detected by the pressure sensor 50, and the blower 20 suppresses the outside air feeding capability by the blower control unit 60 that receives the signal from the pressure sensor 50. Therefore, the adjustment is controlled. Thereby, the outside air is not sent from the blower 20 to the air outlets 71 and 72 of the indoor space 70 in which the constant air flow rate adjusting units 11 and 12 are in the minimum flow rate state or the closed state, Energy consumption related to the feeding operation of the blower 20 can be suppressed, and the outside air can be fed appropriately without waste.

  On the other hand, in order to change the ventilation state from the minimum ventilation state to the intermediate ventilation state and further to the maximum ventilation state as the number of people in the indoor space increases, the constant air volume adjustment units 11 and 12 are changed from the minimum flow state or the closed state. When switched to the maximum flow rate state, the duct internal pressure changes to a smaller extent. The change in the duct internal pressure is detected by the pressure sensor 50, and the blower control unit 60 that receives a signal from the pressure sensor 50 causes the blower 20 to change. Is adjusted and controlled so as to increase the air supply capacity. Thus, outside air is sent from the blower 20 toward the outlets 71 and 72 of the indoor space 70 with a sufficient supply capacity, and even in a situation where the concentration of carbon dioxide in the indoor air tends to increase due to an increase in the number of people in the room, an appropriate amount The outside air can be sent to ensure proper ventilation, and the indoor air can be kept in good condition.

  Thus, in the ventilation system according to the present embodiment, outside air taken in from the external space 80 is sent to the plurality of outlets 71 and 72 of each indoor space 70 through the duct 10 by the blower 20, and The constant air volume adjustment units 11 and 12 are disposed upstream of the outlets 71 and 72, and the presence sensor 30 provided in the indoor space 70 detects the presence of a person in the indoor space 70, and the ventilation amount control unit 40, the number of people in the indoor space is estimated, and when the obtained number of people in the indoor space is sufficiently large and the carbon dioxide concentration in the indoor space is likely to increase, the constant air volume adjusting units 11 and 12 are set to a sufficient predetermined amount. In a situation where the outside air is in the maximum ventilation state that passes through to the indoor space side, but the number of people in the room is less than a few and it is not required to introduce a large amount of outside air, only one constant air volume adjustment unit 12 passes outside air to the indoor space side. Let the indoor space as an intermediate ventilation state Since the ventilation amount of 0 is set to the optimum state according to the situation, in addition to preventing poor ventilation in the indoor space 70 and maintaining a good state of indoor air, the ventilation amount is suppressed while continuing ventilation. The air conditioning load of the indoor space 70 can be reduced.

  In addition, by controlling the blower 20 in response to changes in the duct internal pressure associated with the operation switching of the constant air volume adjusting units 11 and 12, the blower output can be suppressed in accordance with the reduction of the outside air flow rate, and the energy consumption related to ventilation can be reduced. The system can be made small, the system can be operated efficiently with a simple control configuration, and the cost for ventilation can be reduced. Furthermore, it is not necessary to connect and link the central fan control and the control based on the number of people in the constant air volume adjusting units 11 and 12 corresponding to each indoor space, so that the control can be performed independently. The control system can be simplified, and it is easy to add or reduce indoor spaces that are subject to ventilation adjustment.

In the ventilation system according to the embodiment, when the pressure in the duct changes in accordance with the operation switching of the constant air volume adjustment units 11 and 12, this is detected by the pressure sensor 50 and the outside air flow of the blower 20 is detected. Although the supply amount is adjusted, the duct internal pressure detected by the pressure sensor 50 is used to supply the outside air to the indoor space 70 by the constant air volume adjusting units 11 and 12 corresponding to the indoor spaces 70. When the pressure corresponding to the case of switching to a state where the amount is suppressed is reached, the temperature adjustment of the outside air can be stopped. In any indoor space, the number of people in the room is zero by the human sensor 30 . When the state is detected and the ventilation amount control unit 40 brings the constant air volume adjustment units 11 and 12 into a state in which the amount of outside air supplied to the indoor space 70 is suppressed, temperature adjustment of the outside air supplied by the blower 20 is temporarily stopped. That Therefore, when ventilation is performed in each indoor space 70 with the minimum ventilation volume, the temperature adjustment of the outside air that is almost unnecessary is omitted, and the external energy supplied for temperature adjustment is reduced. In addition, energy saving can be realized and the cost of ventilation can be reduced.

Further, in the ventilation system according to the embodiment, the operation switching of the constant air volume adjusting units 11 and 12 based on the detection result of the number of people in the room by the human sensor 30 is switched between the maximum flow rate state and the minimum flow rate state or the closed state. The two constant air volume adjustment units 11 and 12 corresponding to the same indoor space are in a maximum ventilation state in which the maximum flow rate state is achieved, and the intermediate ventilation state in which only one of the two constant air volume adjustment units 12 is in the maximum flow rate state, and, the minimum ventilation other while the closed state of the two constant air volume adjustment portion is a minimum flow condition has a configuration that causes the ventilation of the three stages, the addition, the maximum flow conditions and minimum flow conditions By switching the operation according to the estimation result of the number of people in the room by the human sensor 30 of the plurality of constant air volume adjustment units 11 and 12 that can set one or a plurality of flow rate values during the period, three or more steps of ventilation State Also it can be configured to time difference, and thus can perform ventilation was finely adapted by standing room number.

  Further, in the ventilation system according to the embodiment, a door provided as a doorway to the indoor space 70 or a gap provided in a lower portion of the door is used as an exhaust passage 73 that guides indoor air to the external space 80. Not limited to this, the exhaust passage is formed as a pipe line shorter than the duct 10, and one open end communicates with a predetermined location near the external space of the indoor space, and the other open end communicates with the external space. It is also possible to provide a special air passage that penetrates the walls, etc., allowing the indoor space and the external space to communicate with each other at the shortest distance. Can be executed efficiently.

DESCRIPTION OF SYMBOLS 10 Duct 11, 12 Constant air volume adjustment part 20 Blower 21 Temperature adjustment part 30 Human sensor 40 Ventilation amount control part 50 Pressure sensor 60 Blower control part 70 Indoor space 71, 72 Outlet 73 Exhaust passage 75 Air conditioner 80 External space

Claims (3)

In a ventilation system that ventilates an indoor space by supplying outside air taken in from the outside space to the indoor space,
Intake of fresh air, facing the external space, and, respectively communicated with each disposed a plurality of air outlets facing the plurality of indoor space, the outdoor air that is introduced from the external space to the outlets of the indoor space Each distributing duct,
A blower connected to the vicinity of the outside air inlet of the duct, and for sending outside air to each outlet through the duct at a predetermined pressure;
A constant air volume adjusting unit that is arranged for each air outlet as a state interposed in the middle of the duct at a position near each air outlet, and adjusts the flow rate of the outside air toward the indoor space through the air outlet to a preset value;
An exhaust passage communicating with the indoor space and the external space, and guiding the indoor air to the external space;
A human sensor that is disposed in the indoor space and detects the presence or absence of a person within a predetermined detection range;
The detection state of the presence of a person in each person presence sensor in the indoor space, a ventilation control unit for controlling to switch the outside air flow to a predetermined flow rate in each of constant air volume adjusting unit corresponding to a plurality of air outlets of the front Stories interior ,
A pressure sensor for detecting the pressure in the duct;
A blower control unit that adjusts the amount of outside air supplied by the blower based on the detection result of the pressure sensor ,
The ventilation control unit is
When it can be considered that the number of people in the indoor space is greater than a predetermined threshold from the detection state of each human sensor, the outside air flow rate in the constant air flow rate adjustment unit corresponding to each of the air outlets in the indoor space is set to a predetermined value. Maximum flow rate
In addition, when it can be considered that there is a predetermined number of people below the threshold in the indoor space, the outside air flow rate of the constant air flow rate adjustment unit corresponding to the predetermined air outlet in the indoor space is set as the maximum flow rate, The outside air flow rate in the constant air flow rate adjustment unit corresponding to at least one or a plurality of air outlets excluding the predetermined air outlet is set to 0 or a predetermined minimum flow rate,
Furthermore, when the number of people in the indoor space is 0, the outside air flow rate of the constant air flow rate adjusting unit corresponding to the predetermined air outlet is set to a predetermined minimum flow rate, while the air volume other than the predetermined air outlet in the indoor space is set. The ventilation system characterized by making the outside air flow rate of the constant air volume adjustment part corresponding to a blower outlet into 0 . The ventilation system of claim 1, wherein
Each human sensor in the same indoor space is arranged so that the sensor detection ranges do not overlap,
The ventilation volume control unit estimates the number of people in the indoor space from the frequency of change per predetermined time in the waveform of the signal that detects the presence of a person in each human sensor in the indoor space, and the number of people in the room is predetermined. When the number is larger than the threshold value, the outside air flow rate in the constant air volume adjusting unit is set to the maximum flow rate, and when the number of people in the room is less than the predetermined threshold value, the outside air flow rate in the constant air volume adjusting unit is controlled to 0 or the minimum flow rate. Ventilation system characterized by In the ventilation system according to claim 1 or 2,
A temperature adjusting unit that is disposed near the blower in the duct and adjusts the temperature of the outside air introduced from the external space;
The pressure in the duct detected by the pressure sensor corresponds to the case where the constant air volume adjusting units corresponding to the respective outlets in each indoor space are switched to a state where the supply flow rate of the outside air to the indoor space is suppressed. When it reaches pressure, it stops adjusting the temperature of the outside air ,
When the supply flow rate of the outside air to the indoor space is suppressed, the number of people in all the indoor spaces with the air outlets communicating with the duct is 0, and the outside air flow rate of the constant air flow rate adjusting unit corresponding to the predetermined air outlet Is a state in which the outside air flow rate of the constant air flow rate adjusting unit corresponding to the air outlet other than the predetermined air outlet is zero .

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