JP2003193578A - Exhaust system for building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust system for a building capable of effectively eliminating formaldehyde from an interior space at a low cost without any reduction in the flexibility of designing. <P>SOLUTION: In this exhaust system 10 for the building, a ventilation fan 18 is arranged in the lower position of an internal corner part 20 in a living room 14 of a unit house 10. Results of cumulative experiments shows that a distribution of formaldehyde concentration is uneven, the formaldehyde concentration of a lower part in the living room 14 is higher than that of a higher part, and the highest concentration is given in the internal corner part in association with air flow. When the ventilation fan 18 is arranged in the lower part of the internal corner part 20 showing the highest formaldehyde concentration, formaldehyde can be eliminated from the inside of the room at a low cost without lowering the flexibility of designing. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building exhaust system effective as a formaldehyde removal measure.

[0002]

2. Description of the Related Art In recent years, various studies have revealed that a part of chemical substances (particularly formaldehyde (HCHO)) scattered from building materials and furniture may adversely affect the human body. However, it became known as the so-called sick house syndrome. Furthermore, in the case of modern homes, the design is highly airtight, making it difficult to remove chemical substances that have scattered inside the room, so measures against sick house syndrome have become a major concern even more than before. ing.

Against the background described above, various techniques have been proposed for removing formaldehyde, which is regarded as a main causative substance of sick house syndrome. JP 2000-24
The technique disclosed in Japanese Patent No. 7867 is one of them. Briefly, in the technology disclosed in this publication, it has been clarified that it has the ability to decompose diatomaceous earth, which is porous and has excellent adsorptivity, humidity control property, and formaldehyde into water and carbon dioxide gas. Focusing on phthalocyanine, a ventilation path with a lower end communicating with the room and an upper end communicating with the back of the ceiling between the outer wall and the inner wall of the building, and a circulation path for returning the air flowing into the ceiling to the room. Further, a heat insulating material coated with a mixture of diatomaceous earth and metal phthalocyanine is provided in the air passage.

With the above structure, the air in the room rises along the special heat insulating material after being sucked into the ventilation path from the lower end side of the ventilation path. In this process, formaldehyde in the air is decomposed, and the decomposed air is returned to the room through the circulation path.

[0005]

The above-mentioned technique is considered to be effective as a countermeasure against formaldehyde, but this technique has the following problems.

First, specially designed ventilation and circulation paths must be incorporated into the building design. For this reason, the degree of freedom in designing the building becomes low and the structure becomes large.

Secondly, in addition to the fact that a ventilation passage and a circulation passage having a special structure have to be incorporated as described above, since the heat insulating material coated with a mixture of diatomaceous earth and metal phthalocyanine is used, Higher total cost.

In consideration of the above facts, an object of the present invention is to obtain a building exhaust system capable of effectively removing formaldehyde from an indoor space at a low cost without lowering the degree of freedom of design. .

[0009]

According to a first aspect of the present invention, there is provided an exhaust system for buildings according to the present invention, wherein a forced exhaust means for forcibly exhausting indoor air to the outside is provided at a low position of an indoor wall surface of the building. It is characterized by that.

The operation of the present invention according to claim 1 is as follows.

It is generally said that the concentration of formaldehyde in the air inside a building is determined by the amount of formaldehyde generated and the ventilation rate. However, an experiment using an actual building revealed that the formaldehyde concentration did not drop even if the ventilation volume was simply increased. Then, when the inventors conducted experiments, the following important characteristics regarding formaldehyde were found.

That is, it was found that the concentration distribution of formaldehyde in the room was not uniform and that the lower part of the room was higher than the upper part of the room. Since the specific gravity of formaldehyde is almost the same as that of air, it is unlikely that formaldehyde will accumulate in the lower part of the room under normal conditions, but there are many specific wood building materials that are the source of formaldehyde on the floor. It is speculated that the concentration distribution of formaldehyde is actually higher in the lower part of the room.

The present invention according to claim 1 is made in view of the above-mentioned findings, and as in the present invention, the air in the room is forcedly discharged to the outside at a low position on the wall surface of the building. By providing the exhaust means, formaldehyde accumulated in the lower part of the room can be effectively removed.

Further, in the case of the present invention, since the forced exhaust means is provided at a low position on the indoor wall surface of the building, a ventilation path is provided between the outer wall and the inner wall as in the prior art,
It is not necessary to provide a circulation path communicating with the ventilation path in the ceiling, and it is not necessary to install a heat insulating material corresponding to a special filter. Therefore, the total cost of the building can be kept extremely low without lowering the degree of freedom in design.

According to a second aspect of the present invention, there is provided the building exhaust system according to the first aspect, wherein the forced evacuation means is provided at a low position on a wall surface of a corner portion of the interior of the building. Is characterized by.

The operation of the present invention according to claim 2 is as follows.

Further experiments conducted by the inventors revealed the following important characteristics regarding formaldehyde. That is, it was found that the formaldehyde concentration distribution was not uniform in the lower part of the room, and was particularly high in the corner part of the lower part of the room. It is presumed that this is because even in the same room, the airflow is smallest in the corners and formaldehyde easily accumulates.

The present invention according to claim 2 is made in view of the above-mentioned findings, and as in the present invention, the forced exhaust means is provided at a low position of the wall surface of the corner of the room of the building, thereby lowering the interior of the room. It is possible to effectively remove the formaldehyde accumulated in the.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a building exhaust system according to the present invention will be described below with reference to FIGS.

FIG. 1 shows a schematic block diagram of a building exhaust system 10 according to the present embodiment. As shown in this figure, the building exhaust system 10 according to the present embodiment.
Then, a ventilation fan 18 as a “forced exhaust means” is installed at a low position on the indoor wall surface 16 of the living room 14 of the unit house 12 as a “building”. More specifically, the ventilation fan 18 of the present embodiment is installed at a position near the floor 22 on the interior wall surface 16 of the entrance corner 20 of the living room 14.

FIG. 2 shows the installation position of the conventional ventilation fan 24. As shown in this figure, conventionally, it was customary to install the ventilation fan 24 at a high position of the indoor wall surface 16 of the living room 14 (specifically, at a position close to the ceiling 26).

Next, the experimental results by the inventors will be described, and the operation and effect of this embodiment will be described through the description.

FIG. 3 shows an experimental room (LDK) 1 made by applying the building exhaust system 10 according to the present embodiment.
A schematic plan view of 4 is shown. As shown in this figure, a door 28, a door support member 30, a counter 32, and a storage 34 are installed in the living room 14.
Further, a ventilation fan 18 is installed at a low position of the entrance corner 20 of the living room 14. The ventilation fan used in the experiment 1
In No. 8, the design air volume is 90 (m ³ / h) and the pressure difference is 0.6.
It is a toilet ventilation fan of 0 (Hz), and the air volume during the experiment was 40
(M ³ / h).

In the present experiment, using this living room 14, the entrance corner 20 on the living side, the point B which is the projected corner 36 on the kitchen side, the C point near the support member 30 for the door, the living room center Point D which is a part, and E which is the projected corner portion 38 on the living side
The formaldehyde concentration was measured at a total of 5 points. At this time, at each measurement point, the concentration of formaldehyde was measured for two types, the middle position [the height from the floor 22 is 1200 (mm)] and the lower position [the height from the floor 22 is 50 (mm)]. Therefore, the measurement result is 10
I got it.

As a measuring method, a container sampling method and an adsorption concentration method by a 5-hour closed measuring method were used. FIG. 4 shows the 5-hour closure assay procedure and work schedule. On the first day, the formaldehyde concentration was measured without the ventilation fan 18 installed, and on the second day, the formaldehyde concentration was measured with the ventilation fan 18 installed and operated (operated). On the first day, after ventilating from 8:30 to 9:00, the room 14 was closed from 9:00 to 14:00, and then 1
The formaldehyde concentration at each measurement point was measured for 30 minutes from 4:00 to 14:30. Similarly on the second day, the formaldehyde concentration at each measurement point was measured. However, on the second day, the ventilation fan 18 is operated (operated) from 8:00 to 14:30.

Table 1 below summarizes the measurement results at each measurement point by the above-mentioned measurement method, and graphs of these are shown in FIGS. 5 and 6. Note that FIG. 5 is a graph of the measurement results at each measurement point at the middle position (converted to room temperature 25 ° C.), and FIG. 6 is the measurement result at each measurement point at the lower position (converted to room temperature 25 ° C.). ) Is a graph.

[0027]

[Table 1]

From the above graph, the ventilation fan 18 is installed in the living room 14
It can be seen that the concentration of formaldehyde was lowered at all the measurement points by installing it at the low position of the entry corner 20 of the box. Table 2 below shows the effect of reducing the concentration of formaldehyde. Especially, at the point D (middle position), which is the center of the living room, which residents often use,
The formaldehyde concentration is reduced by 46%.

[0029]

[Table 2]

From the above, it was verified that in order to reduce the concentration of formaldehyde, forced exhaust from the low position of the entrance corner 20 where the concentration is likely to be high due to the air flow is very effective.

As described above, in the building exhaust system 10 according to the present embodiment, since the ventilation fan 18 is provided at the lower position of the wall surface of the entrance corner 20 of the living room 14 of the unit house 12, the formaldehyde accumulated in the lower portion of the room is extremely effective. Can be removed. Furthermore, the living room 14 of the unit housing 12
Since the ventilation fan 18 is provided at a low position on the wall surface of the entrance corner 20, the ventilation passage is provided between the outer wall and the inner wall as in the prior art, or the circulation passage communicating with the ventilation passage is provided in the ceiling. There is no need to install or install a heat insulating material corresponding to a special filter. Therefore, the total cost of the unit housing 12 can be kept extremely low without lowering the degree of freedom in design. Generally speaking, according to the building exhaust system 10 according to the present embodiment, at a low cost, without lowering the degree of freedom in design,
Formaldehyde can be effectively removed from the indoor space.

In the building exhaust system 10 according to the present embodiment described above, the ventilation fan 18 is installed at a low position of the entrance corner 20 of the living room 14, but the invention is not limited to this, and it may be any corner of the room. For example, the ventilation fan 18 may be installed in the projected corners 36 and 38 of the living room 14.

Further, in the building exhaust system 10 according to the present embodiment described above, the existing ventilation fan 18 is used as the forced exhaust means, but the present invention is not limited to this, and the air supply and the exhaust may be installed separately and independently. May be taken. That is, a configuration may be adopted in which an exhaust means for performing only forced exhaust is provided at a low position on the indoor wall surface of the unit house, and an air supply means for taking in outside air is provided at another position on the indoor wall surface. In this case, the “exhaust means” in the above meaning corresponds to the “forced exhaust means” in the present invention.

Further, in the building exhaust system 10 according to the present embodiment described above, the present invention is applied to the unit house 12, but the present invention is not limited to this, and the present invention is applied to buildings other than the unit house. You may.

[0035]

As described above, in the exhaust system for a building according to the present invention as set forth in claim 1, the forced exhaust means for forcibly exhausting the indoor air to the outside is provided at a low position on the indoor wall surface of the building. Therefore, without reducing the freedom of design,
It has an excellent effect that formaldehyde can be effectively removed from the indoor space at low cost.

In the exhaust system for a building according to the present invention as defined in claim 2, in the invention as defined in claim 1, since the forced exhaust means is provided at a low position on the wall surface of the indoor corner of the building, formaldehyde is further effective. It has an excellent effect that it can be removed from the indoor space.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a building exhaust system according to the present embodiment.

FIG. 2 is a schematic configuration diagram of a conventional building exhaust system.

FIG. 3 is a schematic configuration diagram of a living room used in an experiment.

FIG. 4 is a time chart showing the procedure and work schedule of the experiment.

FIG. 5 is a graph showing a measurement result at a middle position.

FIG. 6 is a graph showing the measurement results at the lower position.

[Explanation of symbols]

10 Building exhaust system 12 unit housing (building) 14 living room 16 Indoor wall surface 18 Ventilation fan (forced exhaust means) 20 corners (corner) 36 Outer corner (corner) 38 Outer corner (corner)

Claims (2)

[Claims] 1. An exhaust system for a building, comprising a forced exhaust means for forcibly exhausting indoor air to the outside of the building at a low position on an indoor wall surface of the building. 2. The exhaust system for a building according to claim 1, wherein the forced exhaust means is provided at a low position on a wall surface of an indoor corner of the building.