JP2012021730A - Ventilation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve ventilation performance of an underfloor space and heat insulating property of a building, and to prevent inflow of humid air, bad smell and the like of the underfloor space, to a living space.SOLUTION: A ventilation system 1 for the building having the underfloor space Y and the living space J, includes: an air supply means 4 for supplying the air of the living space J to the underfloor space Y; an exhausting means 5 for discharging the air of the underfloor space Y to the outside of the building; a circulating means 6 for returning the air of the underfloor space Y to the living space J; and a control means 8 for switching the air flow by the exhausting means 5 and the air flow by the circulating means 6.

Description

  The present invention relates to a building ventilation system.

  Patent Document 1 describes a ventilation system having an underfloor communication port that communicates a living space and an underfloor space of a building, and an exhaust means formed at the rising edge of the foundation of the building. In general, the underfloor space is surrounded by a foundation slab and rise, a floor and the like, so that the air permeability is poor and the humidity tends to rise. As a result, condensation and mold are likely to occur in the underfloor space. However, according to the ventilation system of Patent Document 1, the air in the living space can flow into the underfloor space via the underfloor communication port and be exhausted to the outside from the exhaust means. Thereby, since the air permeability of the underfloor space is improved, an increase in humidity can be suppressed and the occurrence of condensation or the like can be prevented.

  Patent Document 2 describes a ventilation structure having an opening provided at the rise of a foundation, an underfloor communication port that communicates a living space and an underfloor space of a building, and a blower that exhausts air in the living space to the outside. Has been. According to this ventilation structure, air permeability in the underfloor space is improved and relatively cool air can be taken into the living space.

JP 2004-232999 A JP-A-8-28924

  However, the ventilation system according to Patent Document 1 has a problem that heat loss is large because air in the living space is unilaterally exhausted outside the building. In particular, when ventilation is performed while managing heat in a building such as a heat-insulated house, there is a problem that the thermal efficiency is lowered.

  Here, in the ventilation system according to Patent Document 1, if a flow path for taking in air in the underfloor space into the living space is provided as in the ventilation structure according to Patent Document 2, it is considered that a decrease in thermal efficiency can be suppressed. . However, for example, in a newly built building, the off-floor space may be filled with a strange odor emanating from the foundation concrete. Also, depending on the season, such as the rainy season or summer, the humidity in the underfloor space may be very high. In this way, if the underfloor space is in a relatively bad environment, humid air or off-flavor in the underfloor space may flow into the living space simply by providing a flow path for taking the air in the underfloor space into the living space. There is.

  The present invention was devised in view of the above-mentioned problems, and while improving the air permeability of the underfloor space and the heat insulation of the building, the humid air and off-flavor in the underfloor space flow into the living space. It is an object to provide a ventilation system that can be prevented.

  In order to solve the above-mentioned problems, the present invention provides a ventilation system for a building having an underfloor space and a living space, the air supply means for supplying air from the living space to the underfloor space, and the air in the underfloor space Exhaust means for exhausting the outside of the building, circulation means for returning the air in the underfloor space to the living space, and control means for switching between the air flow by the exhaust means and the air flow by the circulation means, It is characterized by having.

  According to such a configuration, the air in the living space can be flowed into the underfloor space and can be discharged from the exhaust means or the circulation means, so that the air permeability of the underfloor space can be improved. Moreover, the air that has flowed into the underfloor space from the living space can be circulated back to the living space by the circulation means. Thereby, since the heat obtained inside the building does not escape to the outside, the heat insulating property of the building can be improved. In addition, since the air flow of the exhaust means and the air flow of the circulation means can be switched, it is possible to prevent the humid air or off-flavor in the underfloor space from flowing into the living space.

  It is preferable that a sensor for detecting an environment of the underfloor space is provided, and the control unit switches between an air flow by the exhaust unit and an air flow by the circulation unit based on a detection result of the sensor. Although the environment of the underfloor space changes depending on the season, time, age, etc., according to such a configuration, it is possible to improve the air permeability and the thermal efficiency of the underfloor space according to the change of the environment of the underfloor space.

  Preferably, the exhaust means and the circulation means each include a blower, and the control means operates one of the blower of the exhaust means and the blower of the circulation means and stops the other. According to such a configuration, a ventilation system can be constructed with a simple configuration.

  Further, the exhaust means includes an exhaust duct communicating from the underfloor space to the outside of the building, and an exhaust opening / closing valve formed in the exhaust duct, and the circulation means is disposed from the underfloor space to the living space. A circulation duct that communicates with the circulation duct, and a circulation on-off valve formed in the circulation duct, and a blower is installed in the exhaust duct and the duct that communicates with the circulation duct. One of the on-off valve and the circulation on-off valve is preferably opened and the other is closed. According to such a configuration, a ventilation system can be constructed with a simple configuration.

  Moreover, it is preferable to have an air conditioner that adjusts the air in the living space, and the building is heat-insulated. According to this configuration, the air in the living space can be adjusted, and heat loss in the building can be further suppressed.

  According to the ventilation system of the present invention, it is possible to improve the air permeability of the underfloor space and the heat insulating property of the building, and to prevent the humid air and off-flavor in the underfloor space from flowing into the living space.

It is a mimetic diagram showing the ventilation system concerning a first embodiment. It is a schematic diagram which shows the ventilation system which concerns on 2nd embodiment.

<First embodiment>
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the ventilation system 1 according to the first embodiment will be described by taking as an example a case where ventilation in a house 100 is performed. First, the configuration of the house 100 will be briefly described.

<Composition of house 100>
The house 100 includes a base part 101, a living part 102, and a ceiling part 103. The base 101 includes a slab 104, a rise 105 that rises from the slab 104, and a heat insulating material 106 that is disposed inside the rise 105. An underfloor space Y is formed by the base 101 and the first floor 111 described later.

  A foundation opening 105 a communicating with the outside is formed at the rising 105. The material of the heat insulating material 106 is not particularly limited as long as it is a member that can suppress heat transfer, such as polystyrene foam, glass wool, rock wool, and the like. In the first embodiment, the heat insulating material 106 is provided only on the inside of the rising 105, but the heat insulating material 106 may be disposed on the outside of the rising 105 or on the slab 104. In the first embodiment, a solid foundation is illustrated, but other foundation structures may be used.

  The living unit 102 has a two-story structure, and is mainly composed of a first-floor floor 111, outer walls 112 and 113, a first-floor ceiling 114, a second-floor floor 115, and a second-floor ceiling 116. A living space J composed of inner walls, partitions, and the like is formed inside the living portion 102. In the first embodiment, the living unit 102 is formed with five living spaces, and the first living space J1, the second living space J2, the third living space J3, the fourth living space J4, and the fifth living space, respectively. J5.

  The first living space J1 is a space surrounded by the first floor 111, the outer wall 113, the partition 118, and the first floor ceiling 114. A first floor opening 111a communicating with the underfloor space Y is formed on the first floor 111 of the first living space J1. The partition 118 is a wall that partitions the first living space J1 and the second living space J2, and an undercut 118a such as a ventilation louver is formed at the lower end. A first outlet F1 is formed in the first floor ceiling 114 of the first living space J1. In the first living space J1, a staircase K leading to the second floor is formed.

  The second living space J2 is a space surrounded by the first floor 111, the partition 118, the inner wall 119, and the first floor ceiling 114. A second outlet F2 is formed in the first floor ceiling 114 of the second living space J2. A third outlet F3 is formed in the inner wall 119.

  The third living space J3 is a space surrounded by the second floor 115, the inner wall 120, the partition 121, and the second floor ceiling 116. A fourth outlet F4 is formed in the second-floor ceiling 116 of the third living space J3. The partition 121 is a wall that partitions the third living space J3 and the fourth living space J4, and an undercut 121a such as a ventilation louver is formed at the lower end.

  The fourth living space J4 is a space surrounded by the second floor 115, the partition 121, the inner wall 122, and the second floor ceiling 116. A fifth outlet F5 and a sixth outlet F6 are formed on the second floor ceiling 116 of the fourth living space J4.

  The fifth living space J5 is a space surrounded by the first floor 111, the outer wall 112, the inner wall 119, and the first floor ceiling 114. The fifth living space J5 is a space in which the air conditioner 2 described later is mainly disposed. In the inner wall 119, an inner wall opening 119a communicating with the fifth living space J5 is formed. A second floor opening 111b communicating with the underfloor space Y is formed in the first floor 111 of the fifth living space J5.

  Although specific illustration is omitted, each living space J1 to J5 is provided with a temperature / hygrometer that measures the temperature and humidity of each living space and transmits the measurement result to the control means 8 to be described later. Yes.

  The ceiling 103 is mainly composed of a roof 125. The attic space N is a space surrounded by the outer walls 112 and 113 and the roof 125.

<Configuration of ventilation system 1>
The ventilation system 1 mainly includes an air conditioner 2, a connecting duct 3, an air supply unit 4, an exhaust unit 5, a circulation unit 6, a sensor 7, and a control unit 8. The ventilation system 1 according to the first embodiment controls the air in the underfloor space Y and the living part 102 as a whole.

  The air conditioner 2 is a device that mainly performs cooling and heating, dehumidification, humidification, ventilation, air purification, deodorization, and the like for the living space J (J1 to J5). In the first embodiment, the air conditioner 2 is installed in the fifth living space J5. The air conditioner 2 has an outdoor unit installed outside the house 100 and an air supply / exhaust port 102 b formed in the outer wall 112. The air conditioner 2 is electrically connected to the control means 8.

  In the air conditioner 2, based on the signal transmitted from the temperature / humidity meter installed in the living space J (J1 to J5), the temperature set by the user in the living space J (J1 to J5) by the control means 8 and Adjust the air to achieve humidity. The air conditioner 2 takes in air flowing in from the inner wall opening 119a, the circulation means 6 (second floor opening 111b) and the air supply / exhaust port 102b, performs air purification, deodorization, and the like, and then supplies air from the main ducts D1 and D5. It is formed to do.

  The connection duct 3 supplies the air sent out from the air conditioner 2 to the living spaces J1 to J4. The connecting duct 3 includes a first-floor branch chamber C1, a second-floor branch chamber C2, and each duct.

  The first floor branch chamber C1 is disposed in the attic space N. The first floor branch chamber C1 is a member for supplying the air sent from the air conditioner 2 to the first living space J1 and the second living space J2 on the first floor. The first floor branch chamber C1 is connected to the air conditioner 2 via the main duct D1. The first floor branch chamber C1 is connected to the first outlet F1 via the branch duct D2, is connected to the second outlet F2 via the branch duct D3, and is connected to the second outlet F2 via the branch duct D4. It is connected to F3.

  The branch chamber C2 for the second floor is disposed in the attic space N. The second floor branch chamber C2 is a member for supplying the air sent from the air conditioner 2 to the third living space J3 and the fourth living space J4 on the second floor. The second floor branch chamber C2 is connected to the air conditioner 2 via the main duct D5. The second floor branch chamber C2 is connected to the fourth outlet F4 via the branch duct D6, is connected to the fifth outlet F5 via the branch duct D7, and is connected to the sixth outlet F6 via the branch duct D8. It is connected to. The second-floor ceiling 116 is formed with an inspection port 116b for inspecting the first-floor branch chamber C1 and an inspection port 116a for inspecting the second-floor branch chamber C2.

  The air supply means 4 supplies the air in the living space J to the underfloor space Y. In the first embodiment, the air supply means 4 includes a first floor opening 111a formed in the first living space J1 and a backflow prevention valve (not shown) that does not allow air to flow backward from the underfloor space Y to the first living space J1. It consists of and. In the present embodiment, the air supply means 4 is configured such that air flows into the underfloor space Y from the first living space J1 when the air pressure in the underfloor space Y decreases. In addition, what is necessary is just to provide suitably about a backflow prevention valve as needed. Further, for example, a device for supplying air such as a blower to the underfloor space Y may be provided in the first floor opening 111a.

  The exhaust means 5 exhausts the air in the underfloor space Y to the outside of the house 100. In the first embodiment, the exhaust means 5 includes a basic opening 105 a and a first blower 11. The first blower 11 is disposed in a basic opening 105 a formed at the rising edge 105. The first blower 11 is formed to operate or stop based on a control signal from the control means 8. When the first blower 11 operates, the air in the underfloor space Y is exhausted to the outside.

  The circulation means 6 returns the air in the underfloor space Y to the living space J. In the first embodiment, the circulation means 6 includes a second floor opening 111b and a second blower 12. The 2nd air blower 12 is arrange | positioned by the 2nd floor opening 111b formed in the 5th living space J5. The second blower 12 is formed to operate or stop based on a control signal from the control means 8. When the second blower 12 is activated, the air in the underfloor space Y flows into the fifth living space J5.

  The sensor 7 is a device that measures the environment of the underfloor space Y. The sensor 7 detects the environment of the underfloor space, that is, humidity, temperature, smell, etc., and transmits the detection result to the control means 8. There may be only one detection target or a plurality of detection targets. In 1st embodiment, the case where only the humidity sensor which measures the humidity of the underfloor space Y is used as the sensor 7 is illustrated. The sensor 7 may be installed anywhere as long as it is in the underfloor space Y. In the first embodiment, the sensor 7 is disposed on the back side of the first floor 111.

  The control unit 8 controls the air conditioner 2 and controls the first blower 11 and the second blower 12 based on the detection result of the sensor 7. The control means 8 controls the first blower 11 and the second blower 12 to thereby exhaust the air in the underfloor space Y to the outside of the house 100 and the air in the underfloor space Y into the living space J (fifth). Switch to second ventilation to circulate back to living space J5).

  The control means 8 is electrically connected to the air conditioner 2, the sensor 7, the first blower 11, and the second blower 12. The control means 8 includes, for example, an arithmetic device such as a CPU, a storage device such as a RAM or a ROM, an input means such as a remote controller, a display unit for displaying temperature, humidity, and the like.

  The storage device is configured to store the temperature and humidity of the living space J desired by the user based on the input signal from the input means. The storage device also determines the humidity of the underfloor space Y (hereinafter referred to as “reference value”) as a reference for switching between the first ventilation and the second ventilation based on an input signal from the input means. It is configured to memorize.

  The control means 8 transmits a control signal to the air conditioner 2 so that the living space J becomes the temperature and temperature of the stored living space J. Moreover, the control means 8 transmits a control signal so that the 1st air blower 11 may be operated and the 2nd air blower 12 may be stopped, when it determines with the detection result transmitted from the sensor 7 being more than the memorize | stored reference value.

  On the other hand, when it is determined that the detection result transmitted from the sensor 7 is smaller than the stored reference value, the control unit 8 transmits a control signal to stop the first blower 11 and activate the second blower 12. To do. In addition, in this embodiment, while the air conditioner 2 is act | operating, it forms so that any one of the 1st air blower 11 and the 2nd air blower 12 may act | operate.

Next, the effect of the ventilation system 1 which concerns on 1st embodiment is demonstrated.
In the ventilation system 1 which concerns on 1st embodiment, the temperature and temperature of the living space J shall be set to 25 degreeC and 50%, for example by operation of a user. In addition, it is assumed that a reference value serving as a reference for switching between the first ventilation and the second ventilation by a user operation is set to 50 (%), for example.

  The air sent from the air conditioner 2 is sent to the first floor branch chamber C1 by the main duct D1 and is sent to the second floor branch chamber C2 by the main duct D5. The air divided in the first floor branch chamber C1 is sent from the first air outlet F1 to the first living space J1, and is sent from the second air outlet F2 and the third air outlet F3 to the second living space J2. The air divided in the second-floor branch chamber C2 is sent from the fourth outlet F4 to the third living space J3, and sent from the fifth outlet F5 and the sixth outlet F6 to the fourth living space J4.

  The air sent to each of the living spaces J1 to J4 circulates in the building through the undercuts 118a and 121a, the stairs K, the air supply means 4, the circulation means 6, the inner wall opening 119a of the fifth living space J5, and the like. Thereby, the living space J can be kept at the temperature and temperature set by the user.

  Moreover, in the ventilation system 1, when the detection signal transmitted from the sensor 7 is more than a reference value, the first ventilation is performed. That is, in the ventilation system 1, when the detection signal transmitted from the sensor 7 is equal to or higher than the reference value, the first blower 11 is activated and the second blower 12 is stopped. Thereby, air flows into the underfloor space Y from the first floor opening 111a of the first living space J1, and after passing through the underfloor space Y, the air is discharged from the foundation opening 105a to the outside of the house 100. The air flow of the first ventilation is indicated by thick black arrows in FIG.

  On the other hand, in the ventilation system 1, when the detection signal transmitted from the sensor 7 is smaller than the reference value, the second ventilation is performed. That is, in the ventilation system 1, when the detection signal transmitted from the sensor 7 is smaller than the reference value, the first blower 11 is stopped and the second blower 12 is activated. Thereby, air flows into the underfloor space Y from the first floor opening 111a of the first living space J1, passes through the underfloor space Y, and then flows into the fifth living space J5 from the second floor opening 111b. The air flow of the second ventilation is indicated by the white arrow in FIG.

  According to the ventilation system 1, since air can flow through the underfloor space Y in both the first ventilation and the second ventilation, the air permeability of the underfloor space Y can be improved. Thereby, generation | occurrence | production of the off-flavor of the underfloor space Y and the fall of durability of the wood of the underfloor space Y can be suppressed. Moreover, in this embodiment, since the comparatively low-humidity air of the living space J is supplied to the underfloor space Y, it is easy to reduce the humidity of the underfloor space Y.

  When the humidity of the underfloor space Y is higher than the reference value, that is, when the underfloor space Y is relatively humid, the first ventilation is performed to exhaust the air in the underfloor space Y to the outside of the house 100. Air containing a lot of moisture in the space Y does not flow into the living space J, and the odor of the underfloor space Y does not flow into the living space.

  On the other hand, when the humidity of the underfloor space Y is smaller than the reference value, that is, when the underfloor space Y is relatively low in humidity, the air in the underfloor space Y can be circulated back to the living space J by performing the second ventilation. . Thereby, since heat loss can be suppressed, the thermal efficiency in the house 100 can be increased.

  Moreover, in this embodiment, the circulation means 6 was formed in the 5th living space J5 in which the air conditioner 2 was installed. As described above, since the air conditioner 2 of the present embodiment includes a device that performs air purification and deodorization, the air conditioner 2 absorbs moisture of the air flowing from the underfloor space Y into the fifth living space J5, and also cleans and deodorizes. However, it can be circulated.

  In the present embodiment, since the sensor 7 is provided, the ventilation can be switched according to the change in the humidity (environment) of the underfloor space Y. Thereby, according to the change of the environment of the underfloor space Y, the air permeability of the underfloor space Y and the thermal efficiency can be improved. Further, in the present embodiment, since the air conditioner 2 and the connecting duct 3 are provided and the air in the building is circulated, the entire air including not only the living space J but also the underfloor space Y is provided. Can be adjusted.

  Moreover, since the base part 101 is provided with the heat insulating material 106, the thermal efficiency of the house 100 can be further increased. Moreover, in this embodiment, since the 1st air blower 11 and the 2nd air blower 12 are provided and these operations are only switched by the control means 8, the ventilation system 1 can be comprised simply.

<Second embodiment>
Next, a second embodiment of the present invention will be described.
The second embodiment is different from the first embodiment in that a duct and an on-off valve are provided in the underfloor space Y. In addition, about the part which is common in 1st embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  A ventilation system 1A according to the second embodiment mainly includes an air conditioner 2, a connecting duct 3 (see FIG. 1), an air supply means 4, an exhaust means 5A, a circulation means 6A, a sensor 7, and a control means 8A. .

  The exhaust means 5A includes an exhaust duct D12, an exhaust opening / closing valve 22, and a basic opening 105a. The exhaust duct D12 communicates with the common duct D11 and the foundation opening 105a. A third blower 21 is formed at the end of the common duct D11. The third blower 21 is disposed upstream of the exhaust on-off valve 22 in the air flow. The third blower 21 is electrically connected to the control means 8A, and is configured to always operate when the air conditioner 2 is operating.

  The exhaust opening / closing valve 22 is electrically connected to the control means 8A. The exhaust opening / closing valve 22 opens and closes the flow path of the exhaust duct D12 based on the control signal of the control means 8A.

  The circulation means 6A includes a circulation duct D13, a circulation opening / closing valve 23, and a second floor opening 111b. The circulation duct D13 communicates with the common duct D11 and the second floor opening 111b. The circulation on / off valve 23 is electrically connected to the control means 8A.

  The circulation on / off valve 23 opens and closes the flow path of the circulation duct D13 based on the control signal of the control means 8A. Although the common duct D11 and the third blower 21 are shared by the exhaust means 5A and the circulation means 6A in this embodiment, they may be provided individually.

  The control means 8A controls the air conditioner 2 and opens one of the exhaust on-off valve 22 and the circulation on-off valve 23 based on the inspection result of the sensor 7 and closes the other on the exhaust on-off valve 22 and the circulation on-off valve 23. A control signal is transmitted.

Next, the effect of the ventilation system 1A according to the second embodiment will be described.
In the ventilation system 1A according to the second embodiment, the temperature and humidity of the living space J are set to, for example, 25 ° C. and 50% in the control unit 8A. Further, it is assumed that a reference value serving as a reference for switching between the first ventilation and the second ventilation is set to 50 (%), for example.

  In the ventilation system 1 </ b> A, the air in the living space J is set to have a preset temperature and humidity by the air conditioner 2, the connecting duct 3, and the like.

  Further, in the ventilation system 1A, when the detection signal transmitted from the sensor 7 is equal to or higher than the reference value, the first ventilation is performed. That is, in the ventilation system 1A, when the detection signal transmitted from the sensor 7 is equal to or higher than the reference value, the exhaust on-off valve 22 is opened and the circulation on-off valve 23 is closed. Thereby, air flows into the underfloor space Y from the first floor opening 111a of the first living space J1, flows through the common duct D11 and the exhaust duct D12, and is discharged from the foundation opening 105a to the outside of the house 100. The air flow of the first ventilation is indicated by thick black arrows in FIG.

  On the other hand, in the ventilation system 1A, when the detection signal transmitted from the sensor 7 is smaller than the reference value, the second ventilation is performed. That is, in the ventilation system 1A, when the detection signal transmitted from the sensor 7 is smaller than the reference value, the exhaust on-off valve 22 is closed and the circulation on-off valve 23 is opened. Thereby, air flows into the underfloor space Y from the first floor opening 111a of the first living space J1, flows through the common duct D11 and the circulation duct D13, and flows into the fifth living space J5 from the second floor opening 111b. The air flow of the second ventilation is indicated by the white arrow in FIG.

  The effect similar to 1st embodiment can be show | played also by 1 A of ventilation systems. Further, even the ventilation system 1A can be configured relatively easily. Further, since the common duct D11 and the third blower 21 can be shared by the exhaust means 5A and the circulation means 6A, the number of parts can be reduced.

  In the ventilation system 1A, the exhaust duct D12 is communicated with the basic opening 105a, but the present invention is not limited to this. For example, an opening may be provided in the outer wall 112, and the opening may be communicated with the exhaust duct D12.

  Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, although only the humidity sensor is used as the sensor 7 in the present embodiment, a temperature sensor, an odor sensor, or the like may be used in combination. By using a plurality of sensors, the ventilation can be switched according to the detailed situation of the underfloor space Y. For example, by combining a humidity sensor and a temperature sensor, in the second ventilation, low humidity and low temperature air flows into the living space J in summer, and high humidity and high temperature air flows into the living space J in winter. May be.

  In the present embodiment, the first ventilation and the second ventilation are switched based on the detection result of the sensor 7, but the switching may be performed according to time using a timer or the like. A means for forcibly switching between the first ventilation and the second ventilation may be provided regardless of the detection result of the sensor 7.

  Moreover, in this embodiment, although the heat insulating material 106 was provided only in the base part 101, you may provide in the residence part 102 or the ceiling part 103. FIG.

  In the present embodiment, the first ventilation and the second ventilation are performed in conjunction with the air conditioner 2. However, when the air conditioner 2 is stopped, the first ventilation and the second ventilation are performed. You may comprise so that any one of ventilation may be performed.

  In the present embodiment, either one of the exhaust means 5 and the circulation means 6 is operated and the other is stopped. However, the present invention is not limited to this, and both the exhaust means 5 and the circulation means 6 are operated. It may be configured to provide third ventilation. Moreover, although the case where the ventilation system 1 was provided in the two-story house was illustrated in this embodiment, you may provide in the one-story or three-story or more house. Moreover, you may provide the ventilation system 1 in an apartment.

DESCRIPTION OF SYMBOLS 1 Ventilation system 2 Air conditioner 3 Connection duct 4 Air supply means 5 Exhaust means 6 Circulation means 7 Sensor 8 Control means 11 First blower 12 Second blower 22 Exhaust on-off valve 23 Circulation on-off valve D11 Common duct D12 Exhaust duct D13 Circulation duct 21 Third blower 100 House (building)
J Living space Y Underfloor space

Claims (5)

A ventilation system for a building having an underfloor space and a living space,
An air supply means for supplying air from the living space to the underfloor space;
Exhaust means for exhausting the air in the underfloor space out of the building;
Circulating means for returning the air in the underfloor space to the living space;
Control means for switching between the air flow by the exhaust means and the air flow by the circulation means;
A ventilation system characterized by comprising: Having a sensor for detecting the environment of the underfloor space;
The ventilation system according to claim 1, wherein the control unit switches between an air flow by the exhaust unit and an air flow by the circulation unit based on a detection result of the sensor. The exhaust means and the circulation means each have a blower,
The ventilation system according to claim 1 or 2, wherein the control means operates one of the blower of the exhaust means and the blower of the circulation means and stops the other. The exhaust means includes an exhaust duct communicating from the underfloor space to the outside of the building, and an exhaust opening / closing valve formed in the exhaust duct,
The circulation means includes a circulation duct communicating from the underfloor space to the living space, and a circulation opening / closing valve formed in the circulation duct,
A blower is installed in the duct communicating with the exhaust duct and the circulation duct,
The ventilation system according to claim 1 or 2, wherein the control means opens one of the exhaust on-off valve and the circulation on-off valve and closes the other. An air conditioner for adjusting the air in the living space;
The ventilation system according to any one of claims 1 to 4, wherein the building is heat-insulated.

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