JP2016188753A - Ventilation system and house - Google Patents

Abstract

[PROBLEMS] In buildings such as detached houses, there is no need for complicated duct piping, energy saving can be realized by excellent heat insulation performance, air quality is improved by introducing fresh air into the room, and heat during exhaust is also achieved. To provide a ventilation system and a house capable of reducing loss. In a house having one or a plurality of floor portions, an underfloor space defined below the lowermost floor portion of the floor portions, and a pair of opposing wall portions facing each other. An applied ventilation system, wherein the underfloor space of the house is separated into a first underfloor space and a second underfloor space spatially connected to the living space, and the underfloor separation wall is disposed on the underfloor separation wall. A blower capable of blowing air in the forward and reverse directions, a blower control unit that switches the blowing direction of the blower at a predetermined timing, an air supply / exhaust port provided in the base of the house so as to communicate with the first underfloor space, And an inorganic foam that constitutes the wall and is disposed between the air supply / exhaust port and the blower and divides the outdoor space and the indoor space so as to allow ventilation. [Selection] Figure 2

Description

  The present invention relates to a ventilation system and a house. In particular, the present invention relates to a ventilation system and a house for ventilating a room in a detached house without requiring complicated duct piping and reducing heat loss during exhaust.

  At present, the need for energy saving is increasing as depletion of fossil fuels, air pollution due to the use of large amounts of fossil fuels, and global warming due to carbon dioxide have become major social problems. In particular, energy consumption in houses and buildings is rising as the tendency to desire a comfortable living space using air conditioning is increasing and energy saving is demanded by making the buildings highly airtight and highly insulated. On the other hand, in a space sealed by high airtightness and high heat insulation, the air quality deteriorates due to daily activities. Therefore, planned ventilation is required for buildings with high airtightness and high heat insulation, and both functions are combined. Design and materials are needed.

  Conventionally, in general ventilation, a method of providing a ventilation device on a wall is the mainstream, but heat loss is caused by ventilation. One method for solving this problem is to install a heat exchanger in the ventilation port to reduce heat loss during exhaust. However, this apparatus has a low heat recovery capability and a small ventilation opening opened in the wall, so that the air flow becomes local and it is difficult to ventilate every corner of the room.

  In addition, it is said that the entire building is air-conditioned so that the benefits of a highly airtight and highly insulated house can be fully utilized. A next-generation whole-building air-conditioning system has been proposed that enables air-conditioning with a single wall-mounted room air conditioner, and at the same time allows ventilation, air purification, humidification, and dehumidification. For example, Patent Document 1 and Patent Document 2). In this entire building air conditioning system, for example, as shown in FIG. 8, ventilation and air conditioning (cooling and heating) are performed by stretching a duct like an octopus over the entire room and drawing air through the duct.

Japanese Patent No. 5094894 Japanese Patent No. 5067769

However, in this entire building air-conditioning system, air is routed by a duct, so that the certainty is high from the viewpoint of ventilation, but there are the following drawbacks.
For example, the duct must be stretched like an octopus throughout the room, which complicates the piping and is expensive for the initial investment. Although the exchange efficiency of the total heat exchange device itself of the air conditioning unit has been improved due to recent performance improvements, there is a limit to the heat exchange efficiency of the entire room due to its structure. In addition, the filter must be replaced regularly, which is cumbersome and cumbersome in terms of maintenance. When the system is suspended in spring or autumn, dirty air may stay in the duct during the suspension period, and when the operation is resumed, the dirty air staying in the duct flows into the room.

  Therefore, the present invention solves such problems of the prior art, and in buildings such as detached houses, there is no need for complicated duct piping, energy saving can be realized by excellent heat insulation performance, and It is an object of the present invention to provide a ventilation system and a house capable of improving air quality by introducing fresh air and reducing heat loss during exhaust.

[1]
It is applied to a house having one or a plurality of floor portions, an underfloor space defined below the lowermost floor portion of the floor portions, and a pair of opposing wall portions facing each other. A ventilation system,
An underfloor separation wall that separates the underfloor space into a first underfloor space and a second underfloor space that is spatially connected to the living space of the house;
A blower arranged in the underfloor separation wall and capable of blowing air in forward and reverse directions;
A blower control unit that switches the blowing direction of the blower at a predetermined timing; and
An air supply / exhaust port provided in a base portion of the house so as to communicate with the first underfloor space;
An inorganic foam that constitutes a wall portion directly below the wall and is disposed between the air supply / exhaust port and the blower and partitions the outdoor space and the indoor space so as to allow ventilation;
By blowing air from the first underfloor space toward the second underfloor space by the blower,
(1) The air supplied from the outdoor space to the first underfloor space through the inorganic foam at the air supply / exhaust port is moved from the first underfloor space to the second underfloor space by the blower,
(2) The air moved to the second underfloor space is moved from the second underfloor space to the living space of the house,
(3) The air moved to the living space is exhausted to the outdoor space through the inorganic foam of the wall portion directly under the wall,
By switching the blowing direction of the blower and blowing air from the second underfloor space toward the first underfloor space, the flow of air is reversed from (1) to (3). Ventilation system.
[2]
The ventilation system according to [1], wherein the wall portion directly below the ridge is a wife wall.
[3]
The ventilation system according to [1] or [2], wherein the inorganic foam is breathable inorganic heat insulating concrete (BIC).
[4]
The ventilation system according to any one of [1] to [3], wherein the blowing control unit switches a blowing direction of the blower at intervals of 60 minutes or less.
[5]
The ventilation system according to any one of [1] to [4], further including a temperature / humidity adjusting device disposed in the vicinity of the blower in the underfloor space.
[6]
The ventilation system according to any one of [1] to [5], wherein the floor portion is provided with a vent for allowing air to pass in a vertical direction.
[7]
The living space is partitioned by a partition wall, and the partition wall is provided with a communication port that communicates the partitioned spaces in the lateral direction. Ventilation system as described in section.
[8]
The house provided with the ventilation system as described in any one of [1]-[7].

  In the ventilation system and the house of the present invention, by arranging the inorganic foam in the wall portion and the underfloor space directly under the pair of walls, there is no need for complicated duct piping, and energy saving can be realized by excellent heat insulation performance. In addition to improving air quality through the introduction of fresh air, it is possible to reduce heat loss during exhaust.

It is a perspective view which shows an example of the house where the ventilation system of this invention is applied. It is sectional drawing which shows an example of the house where the ventilation system of this invention is applied. It is a disassembled perspective view for demonstrating the flow of air in the ventilation system of this invention. It is a disassembled perspective view for demonstrating the flow of air in the ventilation system of this invention. It is a disassembled perspective view for demonstrating the flow of air in the ventilation system of this invention. It is a disassembled perspective view for demonstrating the flow of air in the ventilation system of this invention. It is a disassembled perspective view for demonstrating the flow of air in the ventilation system of this invention. It is a figure which shows an example of the conventional whole building air conditioning system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The ventilation system according to the present invention uses dynamic insulation (hereinafter referred to as DI).
Dynamic insulation is a method for supplying and exhausting air from a large-scale building skin with large heat capacity and air permeability. There are advantages such as energy saving effect by collecting indoor heat (through-flow heat) and humidity (total heat recovery) escaping from the building skin, mitigating airflow feeling by distributing air supply, and improving aesthetics by reducing wall natural ventilation openings. .

In particular, in the present invention, DI is a breathing type in which supply and exhaust are alternately performed. This method also collects exhaust heat from ventilation, and is thought to contribute to improving energy saving and dryness.
For example, if the building is made of reinforced concrete (RC), it is basically airtight, and if it is a housing complex, the south side and the north side are in contact with the outside air. A two-way air supply / exhaust port can be secured. However, it was difficult to apply the breathable DI to a detached house with many openings. This is for the following reason. That is, first of all, in a detached house, there are irregular windows on the four walls, and it is difficult to secure a unified wall surface. Moreover, even if a wall is secured by avoiding a window, it is difficult to secure an effective ventilation area on the indoor side due to storage furniture, equipment such as a unit bath and vanity, paintings and wall hangings. In this way, it was difficult to put DI into practical use in a detached house.
Therefore, the present inventors have considered a model for putting the breathable DI into practical use in a detached house with abundant walls.

That is, the ventilation system of the present invention is
It is applied to a house having one or a plurality of floor portions, an underfloor space defined below the lowermost floor portion of the floor portions, and a pair of opposing wall portions facing each other. A ventilation system,
An underfloor separation wall for separating the underfloor space of the house into a first underfloor space and a second underfloor space spatially connected to the living space of the house;
A blower arranged in the underfloor separation wall and capable of blowing air in forward and reverse directions;
A blower control unit that switches the blowing direction of the blower at a predetermined timing; and
An air supply / exhaust port provided in a base portion of the house so as to communicate with the first underfloor space;
An inorganic foam that constitutes a wall portion directly below the wall and is disposed between the air supply / exhaust port and the blower and partitions the outdoor space and the indoor space so as to allow ventilation;
By blowing air from the first underfloor space toward the second underfloor space by the blower,
(1) The air supplied from the outdoor space to the first underfloor space through the inorganic foam at the air supply / exhaust port is moved from the first underfloor space to the second underfloor space by the blower,
(2) The air moved to the second underfloor space is moved from the second underfloor space to the living space of the house,
(3) The air moved to the living space is exhausted to the outdoor space through the inorganic foam of the wall portion directly under the wall,
By switching the blowing direction of the blower and blowing air from the second underfloor space toward the first underfloor space, the flow of air is reversed from (1) to (3). .

In the ventilation system of the present invention, a building having an underfloor space is divided into an underfloor space and a space other than that (residential space), and an inorganic foam in the underfloor space and an inorganic foam in the wall portion directly below the floor are used. Respiratory DI. Since the air is in and out of the foundation and near the roof of the building, it is easy to secure the area of each inorganic foam.
That is, the two wall portions directly under the roof that are the back-to-back of the roof are made of inorganic foam, and the inorganic foam is open to the ventilation layer. The blower (fan) is installed on the rising part (underfloor separation wall) of the foundation which becomes the boundary dividing the underfloor on the first floor.
When air is supplied from the inorganic foam in the underfloor space, the air is exhausted from the inorganic foam in the wall portion directly below the wall. The movement of the air is caused by the blower under the floor. By periodically changing the blowing direction (ventilation direction), the total heat exchange function is utilized and the filter function also works.
Since the indoor air is exhausted to the outside through the inorganic foam, the heat of the indoor air is exchanged with the inorganic foam and stored in the inorganic foam.

The ventilation system according to the present invention includes one or a plurality of floor portions, an underfloor space defined below the bottom floor portion of the floor portions, and a wall portion directly below a pair of facing walls. Applicable to single-family houses (houses). An example of a wall directly under the wall is a wife wall, for example.
In the following description, a two-story house will be described as an example. However, if a house has an under-floor space, it can be used in a one-story (one-story) house and a three-story or more house. The invention is equally applicable. Further, in the following description, a house in which the present invention is applied to a wife wall will be described as an example of a wall directly below the wall, but the present invention is not limited to this.
FIG.1 and FIG.2 is a figure which shows an example of the house where the ventilation system of this invention is applied, FIG. 1 is a perspective view which shows the whole external appearance, FIG. 2 is sectional drawing. 3 to 7 are exploded perspective views for explaining the flow of air in the ventilation system of the present invention.
The house 1 has a base part 10, a floor part (first floor part 20, second floor part 21), a wall part 30, a wife wall part 31 (a wall part directly below the roof), and a roof part 40. . A space surrounded by the base portion 10 and the first floor portion 20 forms an underfloor space 12, and a space surrounded by the floor portions 20 and 21, the roof portion 40 and the wall portion 30 is a living space 22 and 23. (The living space 22 on the first floor, the living space 23 on the second floor). Here, the ceiling plate is not stretched and the roof portion 40 is blown through. The living spaces 22 and 23 are partitioned into a plurality of rooms or hallways by partition walls 32. In addition, a staircase (not shown) that connects the first floor and the second floor is provided to form a staircase room 26. Further, an atrium 27 penetrating the first floor and the second floor may be provided.
In the following description, the inside of the house 1 including the above-described underfloor space 12 and the living spaces 22 and 23 is referred to as “indoor”, and the outside of the house 1 is referred to as “outdoor”.

The underfloor space 12 is separated by the underfloor separation wall 11 into a first underfloor space 12A and a second underfloor space 12B. Specifically, as will be described later, the first underfloor space 12A is connected to the outside through the air supply / exhaust port 15, and the second underfloor space 12B is spatially connected to the living spaces 22 and 23 (second space).
The foundation 10 is provided with an air supply / exhaust port 15 through which air enters and exits so as to communicate with the first underfloor space 12A. The inorganic foam 18 is disposed near the air supply / exhaust port 15 in the underfloor space 12, specifically, between the air supply / exhaust port 15 and the blower 50.
This system is characterized in that the air enters and exits the base portion 10 and the end wall portion 31. By using the base portion 10 and the end wall portion 31 as the entrance and exit of air, it is easy to secure the effective area of the inorganic foam. Also, differential pressure is generated from the beginning by making a difference in height between the air inlet and outlet. Further, by arranging the inorganic foam on the base portion 10, the maintenance of the inorganic foam is facilitated.
Further, this system does not have a duct. By not providing a duct, the structure becomes simple and the initial cost and maintenance labor can be reduced.

It is preferable that the wife wall part 31 (wall part directly under the wall) is a gable wall.
In particular, in the house 1 to which the ventilation system of the present invention is applied, the roof portion 40 is a so-called gable roof in which two inclined surfaces are combined into a mountain shape. By making the roof part 40 into a gable structure, an air flow can be formed along the slope of the roof part 40, and ventilation (especially air supply) from the wife wall part 31 can be performed efficiently.

The end wall 31 is made of an inorganic foam that partitions the outdoor space and the indoor space so as to allow ventilation. The inorganic foam is installed on the end wall or the outer wall in the vicinity thereof, and is further opened to the ventilation layer of the house 1. The ventilation layer is connected to the ventilation of the eaves and roofs, for example.
By arranging the inorganic foam on the end wall portion 31, a wide area can be secured, and air supply and exhaust can be performed efficiently.
Outside air is supplied into the room through the inorganic foam. At this time, the heat transferred from the room to the inorganic foam is heat-exchanged with the air flowing through the inorganic foam, and the heat transferred from the room to the inorganic foam can be recovered. That is, by taking in the outside air through the inorganic foam, the outside air that passes through the inorganic foam can be made to be the same as or similar to the temperature of the indoor space, and fluctuations in the temperature of the indoor space can be suppressed. At the same time, high fresh air quality can be maintained by introducing fresh outside air into the room.
For example, the inorganic foam has a large number of bubbles, and when the outside air passes through the inorganic foam, contaminants (for example, particulate matter such as pollen and dust) contained in the outside air are filtered. As a result, clean air with reduced contaminants is introduced into the room.
A normal ventilation fan installed on a wall or the like has a filter area of about several hundred cm ² , but by arranging an inorganic foam on the wall and ventilating it, for example, a large filter area of 10 m ² or more can be obtained. It can be ensured, and efficient ventilation and filtering can be performed, which is advantageous.
Moreover, since indoor air is exhausted outside through an inorganic foam, the heat which indoor air has is heat-exchanged with an inorganic foam, and is stored in an inorganic foam.

  Moreover, since the inorganic material which is a material of an inorganic foam has high hydrophilicity, it is possible to hold moisture inside the material by adsorption or the like. Humidity also moves through the inorganic foam when the air moves from the room to the room and from the room to the room, so that the room humidity can be maintained. It is also possible to prevent dew condensation from occurring inside the first and second inorganic foams.

  In addition, since the inorganic foam is formed in a shape having a large number of minute spaces (bubbles) called a foam, the material itself is lightened, and a panel shape can be obtained. For example, in the case of a fiber-based material, the panel shape cannot be maintained, and it is difficult to bear the load, so that it can only be placed in a frame material or the like as a filter. In addition, since the air flow rate is large and the heat capacity is small in the fiber material, it cannot be used unless the thickness is increased. On the other hand, if it is an inorganic foam, the single wall which can also carry out heat recovery only and can bear a wind load can be comprised. Thus, by using an inorganic foam, handling property and workability are significantly improved as compared with the fibrous material. Furthermore, the light weight leads to a reduction in the weight of the building and increases the earthquake resistance. Furthermore, when the outside air passes through the inorganic foam, the contaminant contained in the outside air is removed by the inorganic foam, and the effect of the filter can be expected.

  As such an inorganic foam, a breathable inorganic heat insulating concrete (BIC) is preferable. Specifically, for example, lightweight cellular concrete having air permeability having a thickness of 150 mm or less and a specific gravity of about 0.25 to 0.40 can be given. According to this, there is no problem in terms of fire resistance and production.

Moreover, the optimal ventilation effect is obtained by setting the air permeability of the inorganic foam to 5 × 10 ^{−4 to 1} m ² h ⁻¹ Pa ⁻¹ and the thermal conductivity to 0.02 to 0.1 W / mK. In addition, a heat recovery effect can be obtained.

  Moreover, the optimal heat recovery effect can be acquired by making the heat capacity of an inorganic foam into 2-40Kcal / degreeC.

  As shown in FIG. 3, the underfloor space 12 is separated into a first underfloor space 12A and a second underfloor space 12B by an underfloor separation wall 11. The first underfloor space 12 </ b> A communicates with the outdoor space through the air supply / exhaust port 15 provided in the base portion 10, and the second underfloor space 12 </ b> B is spatially connected to the living spaces 22 and 23.

  In the ventilation system of the present invention, air is moved in one direction between the underfloor space 12 and the living spaces 22 and 23, so that the air flow in each floor is the same, and between the rooms generated at the partition. Differential pressure can be eliminated. For this reason, it is hard to produce differential pressure | voltage in the fittings between rooms, for example, can open and close a door smoothly. Further, since the partition wall 32 that divides the room is not required to be airtight, the degree of freedom of the floor plan is increased.

A blower 50 is disposed on the underfloor separation wall 11 that separates the underfloor space 12 into a first underfloor space 12A and a second underfloor space 12B. The blower 50 can switch the blowing direction in the forward and reverse directions between the first underfloor space 12A and the second underfloor space 12B by a blower control unit (not shown).
In this ventilation system, by operating the blower 50, air moves between the first underfloor space 12A and the second underfloor space 12B, and one of the first underfloor space 12A and the second underfloor space 12B is decompressed. It becomes space and the other becomes pressure space. The pressurization space has a pressure higher than the air pressure in the outdoor space, and the decompression space has a pressure lower than the air pressure in the outdoor space.
The pressure difference between the decompression space and the pressurization space created by the blower 50 is the power for moving the air.

In the underfloor space 12, a temperature / humidity adjusting device 52 is disposed in the vicinity of the blower 50.
A temperature / humidity adjusting device 52 is installed in any of the underfloor spaces 12, particularly in the vicinity of the blower 50, to adjust the temperature and / or humidity of the air. By arranging the temperature / humidity adjusting device 52 in the underfloor space 12 that is narrower than the living spaces 22 and 23, the temperature and / or humidity of the blown air can be adjusted, and the thermal efficiency is improved. Moreover, there is no problem of noise by arranging in the underfloor space 12. Such a temperature / humidity adjusting device may be a heat-dissipating heating system or the like, but an air conditioner is preferable because air can be efficiently cooled and heated.
In particular, when the building is made of RC (steel reinforced concrete), for example, by arranging the temperature / humidity adjusting device 52 and the blower 50 in the underfloor space, the heat capacity of the RC can be used, and the heat storage property of the house 1 is improved. Can do.

  Since the blower 50 and the temperature / humidity adjusting device 52 are disposed in the underfloor space 12, an inspection port for maintenance of the blower 50 and the temperature / humidity / adjusting device 52 is required. In this case, the airtightness of the inspection port is important.

The first floor portion 20 and the second floor portion 21 are respectively provided with vent holes 24 and 25 that allow air to pass in the vertical direction.
The air moves between the underfloor space 12 (second underfloor space 12 </ b> B) and the living spaces 22 and 23 through the vent holes 24 and 25 due to the pressure of the blower 50 in the lower part of the floor. Accordingly, the second underfloor space 12B is spatially connected to the living spaces 22 and 23.
The position where the vents 24 and 25 are provided is not particularly limited. For example, the vents 24 and 25 may be provided at the end of the room, particularly on the outer wall side so that the vents 24 and 25 are not covered with carpets or furniture. It is preferable that it is arranged.
It is preferable that at least one vent hole 24, 25 is provided in each partitioned room, and it is preferable that the vent holes 24, 25 are arranged as evenly as possible along the outer wall in the entire floor. Thereby, air can be circulated uniformly in each floor.
In addition, if there are a staircase 26 and an atrium 27 connecting the lower floor and the upper floor, these spaces play a large role in the movement of air.

The living spaces 22 and 23 are partitioned into spaces such as a room and a corridor by a partition wall 32, and the partition wall 32 is provided with a communication port 33 that communicates the partitioned spaces in the lateral direction ( (See FIG. 7).
Thereby, the partitioned rooms communicate with each other in the horizontal direction, a horizontal air flow can be created, and fresh air can be spread over the entire floor. Therefore, ventilation can be performed more efficiently. The position of the communication port 33 is not particularly limited. For example, it is preferable that the communication port 33 is disposed on the upper part of the partition wall 32 so as not to be covered with furniture or the like.

Next, the flow of air in the ventilation system of the present invention will be described.
<Positive direction>
First, the flow of air when the air supplied from the lower floor is conveyed to the living spaces 22 and 23 and exhausted from the end wall 31 will be described.
As shown in FIG. 3, the blower 50 blows air from the first underfloor space 12 </ b> A toward the second underfloor space 12 </ b> B. Thereby, the first underfloor space 12A becomes a decompressed space, and the second underfloor space 12B becomes a pressurized space. Then, air flows from the air supply / exhaust port 15 into the first underfloor space 12A, which is a decompression space, and a series of air flows is generated in which air flows out from the vent holes 24 in the second underfloor space 12B, which is a pressurization space. .

That is, the air is supplied from the outdoor space to the first underfloor space 12A through the air supply / exhaust port 15 provided in the lower part of the floor (see FIGS. 2 and 3). All of the air supply / exhaust ports 15 in the lower floor are on the air supply side. Outside air is supplied to the first underfloor space 12 </ b> A through the inorganic foam 18 disposed in the vicinity of the air supply / exhaust port 15 and between the air supply / exhaust port 15 and the blower 50. At this time, the heat transferred from the room to the inorganic foam 18 is heat-exchanged with the air flowing through the inorganic foam 18, and the heat transferred from the room to the inorganic foam 18 can be recovered.
The air supplied to the first underfloor space 12A is moved from the first underfloor space 12A to the second underfloor space 12B by the blower 50. At this time, the air is adjusted to an appropriate temperature and / or humidity by the temperature / humidity adjusting device 52 (see FIGS. 2 and 3).

The air that has moved to the second underfloor space 12B moves from the second underfloor space 12B to the living space 22 on the first floor through the vent 24 provided in the first floor portion 20 (see FIGS. 4 and 5). Warm air is supplied from all the vents 24.
The air that has moved to the first-floor living space 22 moves to the second-floor living space 23 through the vent 25, the staircase 26, and the blow-off 27 provided in the second floor portion 21 (see FIGS. 2 and 6). Here, as shown in FIG. 7, the rooms on the second floor communicate with each other in the lateral direction through the communication port 33 provided in the partition wall 32, so that fresh air can be spread over the entire floor ( The same applies to the first floor).
The air that has moved to the living space 23 on the second floor is exhausted to the outdoor space through the end wall 31 at the top of the space (see FIGS. 2 and 7). The wife wall 31 is entirely on the exhaust side. Since the air is exhausted to the outside through the inorganic foam disposed on the end wall 31, the heat of the indoor air is exchanged with the inorganic foam and is stored in the inorganic foam. The exhaust from the inorganic foam is cold because it is totally heat exchanged.

Here, the ventilation control unit switches the blowing direction of the blower 50 at a predetermined timing. The air flow created by the blower 50 is not unilateral. When the blowing direction is reversed by reversing the rotation direction of the blower 50 (fan) by the blowing control unit, the air flow (moving direction) is also reversed in the forward and reverse directions, which is opposite to the above-described flow.
In the indoor space, the heat of the indoor air is exchanged with the inorganic foam and is stored in the inorganic foam.If this state continues for a long time, the heat exceeding the heat capacity of the inorganic foam is released to the outside, and the heat is lost. It will be lost. Then, the ventilation control part switches the direction of the ventilation by the air blower 50, and the space that was the pressurized space of the first underfloor space 12A and the second underfloor space 12B is switched to the reduced pressure space. This also reverses the air flow. On the air supply side switched from the exhaust side, when the outside air is supplied into the room through the inorganic foam, the heat stored in the inorganic foam is exchanged with the outside air and taken into the air. The collection capacity can be increased. In this way, by switching the blowing direction of the blower 50, fresh outside air can be taken into the room in any space, and high air quality can be maintained in the entire indoor space.

The interval at which the air blow control unit reverses the operating direction of the blower 50 forward and reverse depends on the size of the indoor space, the pressure difference between the outside and the room, the heat capacity of the inorganic foam, and the amount of air ventilating the inorganic foam. It is preferable to switch the blowing direction at intervals of 60 minutes or less so as not to increase the amount of heat released from the indoor space to the outdoor space. If it is a normal single-family house scale, it is preferable that it is 10 minutes or more and 30 minutes or less. If the switching time is less than 10 minutes, it may be insufficient to sufficiently reverse the air flow of the entire house. If the switching time exceeds 30 minutes, the heat released from the indoor space to the outdoor space increases, and the overall heat recovery capability decreases. By switching the blowing direction at intervals of 10 minutes or more and 30 minutes or less, the air flow of the entire house can be sufficiently reversed, and the overall heat recovery capability is also improved.
In addition, the blower 50 is operated in the reverse direction to reverse the air flow, thereby eliminating the clogging of the inorganic foam and providing the filter function (for example, pollen removal function) inherent to the inorganic foam. It is thought that there is an effect to make it last longer.

  In addition, the air blowing control unit variably controls the air blowing amount of the blower 50, so that the amount of air that can be supplied and exhausted through the inorganic foam according to the upper and lower layers, the size of the indoor space, the climate, the temperature, and the like. The heat recovery rate of the entire room can be improved by adjusting to a predetermined value.

  In particular, in the ventilation system of the present invention, the load energy of the blower 50 changes because the positional energy of the air changes between the air supply side space and the exhaust side space during forward and reverse reversal. That is, the capability of the blower 50 may be changed between the forward rotation side and the reverse rotation side.

Next, the flow of air when the air supplied from the end wall portion 31 is moved to the lower floor and exhausted from the lower floor will be described. In this case, although illustration is omitted, the direction in which the air flows is opposite to the direction of the arrows in FIGS.
<Reverse direction>
The blower 50 blows air from the second underfloor space 12B toward the first underfloor space 12A. As a result, a series of air flows is generated in which air flows into the second underfloor space 12B, which has become a decompression space, and the air flows out from the first underfloor space 12A, which has become a pressurization space.

That is, the air supplied from the outdoor space to the second-floor living space 23 through the wife wall portion 31 passes through the vent 25, the staircase 26 and the blow-off 27 provided in the second floor portion 21, and the first-floor living space 22. Move up.
The air that has moved to the living space 22 on the first floor moves to the second underfloor space 12 </ b> B through the vent 24 provided in the first floor portion 20.
The air moved to the second underfloor space 12B is moved from the second underfloor space 12B to the first underfloor space 12A by the blower 50.
The air that has moved to the first underfloor space 12 </ b> A is exhausted to the outdoor space through the air supply / exhaust port 15.

Thus, in the ventilation system of the present invention, the breathable DI in a single-family house could be put into practical use by arranging the inorganic foam on the pair of walls and the space under the floor. This eliminates the need for complicated duct piping, enables energy savings due to excellent heat insulation performance, improves air quality by introducing fresh air into the room, and reduces heat loss during exhaust. it can.
Moreover, in this system, since the air flow is the same for each floor, a differential pressure between rooms is unlikely to occur. For this reason, airtightness is not required for the partition wall that divides the room, and the degree of freedom of the floor plan increases.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and can be appropriately changed without departing from the spirit of the invention.

  By using the ventilation system according to the present invention, there is no need for complicated duct piping, energy saving can be realized by excellent heat insulation performance, air quality can be improved by introducing fresh air into the room, and heat at the time of exhaust can be achieved. Loss can be reduced, and it can be widely used as a ventilation system in a building such as a detached house having an underfloor space.

1: House 10: Foundation part 11: Underfloor separation wall 12: Underfloor space 12A: First underfloor space 12B: Second underfloor space 15: Air supply / exhaust port 18: Inorganic foam 20: First floor 21: Second floor 22: Living space (1st floor)
23: Living space (2nd floor)
24: Vent 25: Vent 26: Staircase 27: Vent 30: Wall 31: Tsum wall (wall section directly under the wall)
32: Partition wall 33: Communication port 40: Roof portion 50: Blower 52: Temperature / humidity adjusting device

Claims (8)

It is applied to a house having one or a plurality of floor portions, an underfloor space defined below the lowermost floor portion of the floor portions, and a pair of opposing wall portions facing each other. A ventilation system,
An underfloor separation wall that separates the underfloor space into a first underfloor space and a second underfloor space that is spatially connected to the living space of the house;
A blower arranged in the underfloor separation wall and capable of blowing air in forward and reverse directions;
A blower control unit that switches the blowing direction of the blower at a predetermined timing; and
An air supply / exhaust port provided in a base portion of the house so as to communicate with the first underfloor space;
An inorganic foam that constitutes a wall portion directly below the wall and is disposed between the air supply / exhaust port and the blower and partitions the outdoor space and the indoor space so as to allow ventilation;
By blowing air from the first underfloor space toward the second underfloor space by the blower,
(1) The air supplied from the outdoor space to the first underfloor space through the inorganic foam at the air supply / exhaust port is moved from the first underfloor space to the second underfloor space by the blower,
(2) The air moved to the second underfloor space is moved from the second underfloor space to the living space of the house,
(3) The air moved to the living space is exhausted to the outdoor space through the inorganic foam of the wall portion directly under the wall,
By switching the blowing direction of the blower and blowing air from the second underfloor space toward the first underfloor space, the flow of air is reversed from (1) to (3). Ventilation system.   The ventilation system according to claim 1, wherein the wall portion directly below the ridge is a wife wall.   The ventilation system according to claim 1 or 2, wherein the inorganic foam is a breathable inorganic heat insulating concrete (BIC).   The ventilation system according to any one of claims 1 to 3, wherein the blowing control unit switches the blowing direction of the blower at intervals of 60 minutes or less.   The ventilation system according to any one of claims 1 to 4, further comprising a temperature / humidity adjusting device arranged in the vicinity of the blower in the underfloor space.   The ventilation system according to any one of claims 1 to 5, wherein the floor portion is provided with a vent for allowing air to pass in a vertical direction.   The living space is partitioned by a partition wall, and the partition wall is provided with a communication port that communicates the partitioned spaces in a lateral direction. The ventilation system described.   The house provided with the ventilation system as described in any one of Claims 1-7.

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