JPH0355449A - Room ventilation system - Google Patents

Abstract

PURPOSE:To achieve a uniform distribution of air current and remarkably improve the overall ventilation efficiency of a room by a method wherein a suction port in an exhaust zone is located on a wall opposite to the rear face of a rack and at nearly the same height as the uppermost part of the rack, and the distance between the rear face of the rack the wall is specified. CONSTITUTION:A suction port 7 of an exhaust zone 6 is located at the same height as the uppermost part of a rack 2. Then, air passes through spaces 3a-3d arranged between shelves of the rack 2 and exhausted outside through the suction port 7 with preventing the air from returning into a working space 4 on the air supply side. Therefore, a useless ventilation is avoided and the ventilation efficiency is improved. As the suction port 7 is located at the same height as the uppermost space 3a, an air current 8e which flows directly toward the suction port 7 is surely produced, so that the ventilation efficiency at that part is remarkably improved. Moreover, as the rack is arranged at a location where the rack is not projected right under an air outlet, and the distance between the rare face of the rack and the opposite wall is 10-15% of the distance between the center of the air inlet and the wall, a uniform distribution of air current can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a system for ventilating a room such as an animal breeding room.

[Prior Art] In an animal breeding room where experimental animals are kept, racks having multiple tiers of placement space partitioned by multiple shelves are placed on both sides of the room, and animals are placed in the placement spaces of each tier. The work is done in the work space formed between the racks on both sides. In such animal breeding rooms, it is necessary to control odors, dust, microorganisms, etc.
Generally, an all-outside air indoor ventilation system is used, and ventilation is performed frequently.

In recent years, indoor ventilation systems of this type have been designed to collect air blown into the animal breeding room from the workspace side into racks, as reports have recently been made of the occurrence of allergies in animals and the danger to workers in carcinogenicity tests. A supply/exhaust type indoor ventilation system that focuses on unidirectional flow from the interior to the exhaust side has been proposed and is now being adopted.

FIG. 7 is a diagram showing an indoor ventilation system for such an animal breeding room, and FIG. 8 is an airflow distribution diagram of the right half of the system in FIG. 7. As shown in Figure 7, animal breeding room 1
Racks 2 are arranged on both sides of the interior. Each rack 2
has five shelf boards 2a to 2e, and these shelf boards 2a to 2e.
With 2e as a partition, there are 4 vertically arranged spaces 3
A to 3d are formed. Between the racks 2 on both sides,
An air supply side work space 4 is formed, and an air outlet 5 is provided at the center of the ceiling surface of this air supply side work space 4 to send clean air into the animal breeding room 1. Also, between the back of each rack 2 and the wall facing it,
An exhaust side space 6 is formed which is narrower than the air supply side work space 4, and a suction port 7 is provided below the side wall surface of this exhaust side space 6 to suck in the air inside the animal breeding room 1 and release it to the outside. It is designed to be exhausted.

In the indoor ventilation system as described above, clean air is sent from the outside to the air supply side work space 4 through the air outlet 5, and at the same time, air from the exhaust side space 6 is sucked in through the suction port 7 and exhausted to the outside. As a result, a series of air currents is generated in which the air sent into the animal breeding room 1 is divided from the air supply side work space 4 to the arrangement spaces 3a to 3d of each stage of the rack 2, and flows into the exhaust side space 6. This airflow allows the dirty air in the animal breeding room 1, especially the dirty air in the rack 2, to be replaced with clean air.

[Problems to be Solved by the Invention] By the way, in the indoor ventilation system shown in FIG. 7, as shown in the airflow distribution diagram in FIG. An airflow 8a toward the upper part of the exhaust side space 6 is generated, and the rising air further flows along the ceiling surface and flows back into the air supply side work space 4 (airflow 8b).
As a result, the dirty air sent out from the arrangement spaces 3a to 3d of each stage of the rack 2 tends to flow back into the air supply side work space 3, resulting in a decrease in ventilation efficiency. Therefore, in order to effectively ventilate the room, the amount of ventilation must be increased by the amount of this decrease in ventilation efficiency, and as a result, the air supply and exhaust blower, duct 1, and other equipment becomes large.

Further, as shown in FIGS. 7 and 8, the air sent from the outlet 5 becomes an airflow 8c that descends to the floor surface, passes through the lower placement space 3d of the rack 2 (airflow 8d
), the airflow 8a rises in the exhaust side space 6, producing a high-speed airflow 8d in the lower part of the rack 2, while in the arrangement space 3a in the uppermost part of the rack 2, the air is almost stagnant. This results in an airflow dead zone S1 as shown by the broken line in the figure, resulting in a disadvantage of disparity in indoor ventilation efficiency. As a result, while the ventilation efficiency is extremely high in the lower arrangement space 3d of the rack 2, the ventilation efficiency is extremely poor in the upper arrangement space 3a. Since the airflow distribution in 3d becomes extremely non-uniform, the ventilation efficiency of each stage becomes extremely non-uniform. On the other hand, in order to effectively ventilate the entire room, the overall ventilation volume must be adjusted according to the areas with poor ventilation efficiency, so if the area with extremely poor ventilation efficiency (upper placement space 3a) is If this happens, the amount of ventilation throughout the room will eventually have to be increased significantly.

Furthermore, when downsizing blowers, ducts, and other equipment for supplying and exhausting air, the amount of air supplied to accommodate the indoor cooling load is smaller than the required ventilation amount, such as when there are things that generate heat indoors. If the amount of ventilation is high, it may be possible to reduce the amount of ventilation by reducing the temperature difference between the air sent into the room and the air inside the room.

However, in the indoor ventilation system shown in Figure 8,
Even if you increase the temperature difference between the incoming air and the indoor air,
Although the speed of the airflow increases, the airflow distribution in the arrangement spaces 2a to 3d of each stage of the rack 2 is not uniform, so the temperature difference between each stage only increases, and in the end, the ventilation volume cannot be reduced. It is difficult to downsize various equipment such as blowers and ducts.

Conventionally, as a method to improve the above-mentioned drawbacks, a partition 9 is provided between the air supply side work space 4 and the rack 2, as shown in FIG.
A technique has been proposed to improve ventilation efficiency by preventing the air that has passed through 3d from flowing into the air supply side working space 4 again, but in this case, the configuration is complicated by the provision of the partition 9, There is a problem in practicality in terms of cost.

The present invention was proposed in order to solve the problems of the prior art as described above, and its purpose is to equalize the airflow distribution by improving the simple structure and improve the ventilation efficiency of the entire room. An object of the present invention is to provide an indoor ventilation system that is small, simple, and has excellent practicality, allowing the amount of ventilation to be reduced to the necessary minimum.

[Means for Solving the Problems] In the indoor ventilation system according to the present invention, racks having multiple shelf boards are arranged on both sides of the room, and between the racks on both sides,
An air supply side work space is provided in which work is performed, and an air outlet is installed on the ceiling of this air supply side work space to supply clean air. In an indoor ventilation system, the basic configuration is to provide an exhaust side space that is narrower than the air side work space, and to provide a part of this exhaust side space with a suction port that sucks indoor air and exhausts it to the outside.
The inlet is placed on the wall facing the back of the rack at a height between the top shelf of the rack and the second shelf from the top, and the rack protrudes at least directly below the air outlet. Furthermore, the dimension between the back surface of the rack and the wall facing it is set to 10 to 15% of the dimension from the center of the air outlet to the wall surface.

In addition, an inlet is provided along the back surface of the rack so as to cover almost the entire area from one end to the other, and a plurality of air outlets are provided, and these outlets can be freely arranged along the opposing surface of the rack. When the racks are arranged side by side with an interval of , the speed is set to produce a flow from the wall side toward the center side.

[Function] In the present invention having the above configuration, by arranging the suction port at a height between the topmost shelf board of the rack and the second shelf board from the top, The upward airflow that travels along the wall surface toward the top of the exhaust side space, that is, the air that has passed through the placement space of each rack stage, can be reliably exhausted to the outside from the suction port without returning to the air supply side work space. Eliminates wasted ventilation and improves ventilation efficiency.

In addition, with this arrangement of the suction ports, it is possible to generate airflow that flows directly to the suction ports in the installation space at the top of the rack, where airflow dead zones are likely to occur, thereby making the airflow distribution uniform in the installation space of each rack level. This makes it possible to improve the ventilation efficiency of the entire room and reduce the amount of ventilation to the necessary minimum.

Furthermore, since the airflow distribution can be made uniform in this way,
When the amount of air supplied to accommodate the indoor cooling load is larger than the required ventilation amount, there is the advantage that equipment and ducts can be made smaller by increasing the temperature difference between the air sent into the room and the air inside the room.

By the way, even if the inlet is arranged as described above, if the rack protrudes directly below the outlet, this protruding part will obstruct the airflow descending from the outlet, and there is a risk that a stable airflow distribution will not be obtained. be.

Additionally, if the dimension between the back of the rack and the wall facing it is less than 10% of the dimension from the center of the air outlet to the wall, the exhaust side space will be too narrow and it will be difficult to generate sufficient airflow. If the ratio exceeds 15%, the airflow rising from the bottom of the rack to the rear of the rack will no longer be able to attract air from each rack, creating a dead zone in the top of the rack, resulting in a uniform airflow distribution. There is an inconvenience that you will not be able to obtain it.

In contrast, in the present invention, the rack is arranged at least in a position that does not protrude directly below the air outlet, and the dimension between the back surface of the rack and the wall facing it is equal to the dimension from the center of the air outlet to the wall surface. Since it is set at 10 to 15%, uniform airflow distribution can be obtained.

In addition, if there are multiple air outlets and these air outlets are arranged at arbitrary intervals along the opposing surfaces of the rack, the air that is sent in from the multiple air outlets and descends will be Since there is a large upward airflow in a space without an exit, the effect of this airflow creates a dead zone of airflow in the portion of the rack facing this upward airflow, resulting in a disadvantage of reduced ventilation efficiency. In this case, there was no room for improvement in the conventional technology in which the suction port was provided at the bottom, but according to the present invention, in which the suction port is provided at the top of the rack, the suction port is placed along the back surface of the rack. By installing it so as to almost cover the entire area from one end to the other, and by creating a flow from the wall side toward the center above the rack in the problem area, sufficient Can generate airflow. That is, in the present invention, the speed of the air sent from the air outlet is adjusted to the wall surface in the space formed between the top surface of the second rack rack and the ceiling surface in the portion facing the space where the air outlet is not provided. By setting the speed to generate a flow from the sides toward the center, there will be no airflow dead zone in the rack section, and a uniform airflow can be generated, resulting in sufficient ventilation efficiency.

[Example] Hereinafter, an example in which the indoor ventilation system according to the present invention is applied to an indoor ventilation system for an animal breeding room will be described in detail with reference to FIGS. 1 to 3.

Here, FIG. 1 is a sectional view taken along arrow A in FIG. 2, FIG. 2 is a plan view, and FIG. 3 is a sectional view taken along arrow B in FIG.

Note that the same parts as in the prior art shown in FIGS. 7 to 9 are given the same reference numerals.

First, as shown in FIG. 1, the basic configuration of this embodiment is the same as that of the prior art shown in FIG. That is, racks 2 are arranged on both sides of the animal breeding room 1, and each rack 2 has 5
It has tiered shelf boards 2a to 2e, and these shelf boards form four tiered arrangement spaces 38 to 3d. A wide air supply side work space 4 and a narrow exhaust side space 6 are formed between the racks 2 on both sides and on the back of each rack 2, and the ceiling surface of the air supply side work space 4 is formed. is provided with an air outlet 5.

In this embodiment, the suction port 7 is arranged on the wall surface facing the back surface of the rack 2 at a height ranging from the top shelf board 2a of the rack 2 to the second shelf board 2b. As shown in FIGS. 2 and 3, the suction port 7 is provided along the back surface of the rack 2 so as to cover almost the entire area from one end to the other end. is, 2
They are arranged along the opposing surface of the rack 2 at intervals.

In this embodiment having such a configuration, the airflow distribution is made uniform as shown in FIGS. 1 and 4 (airflow distribution diagram showing the right half of FIG. 1). That is, rack 2
In the conventional technology in which the suction port 7 was arranged below, the rising air flow 8a flowing from the lower back side of the air tank along the wall surface toward the upper part of the exhaust side space 6 flows directly along the ceiling surface into the air supply side work space 4. However, in this embodiment, in which the suction port 7 is adjusted to the height of the uppermost part of the rack 2, the air that has passed through the arrangement spaces 3a to 3d of each rack 2 is recirculated. Since the air can be exhausted to the outside from the suction port 7 without being returned to the work space on the air supply side, there is no waste of ventilation compared to the conventional technology, and ventilation efficiency can be improved.

In addition, in the prior art, as shown in FIGS. 7 and 8, an airflow dead zone S1 as shown by the broken line in the figure occurs in the upper arrangement space 3a of the rack 2. In this embodiment, in which the suction port 7 is arranged at the height of the space 3a, as shown in FIG. The ventilation efficiency of the area can be greatly improved.

Therefore, in this embodiment, the airflow distribution in each stage of the rack 2 can be made uniform and the ventilation efficiency in each stage can be made uniform, so the ventilation efficiency of the entire animal breeding room 1 can be improved and the ventilation amount can be reduced to the necessary minimum. can be reduced to As a result, air supply and exhaust air blowers, ducts, and other equipment can be downsized.

Furthermore, if the amount of ventilation corresponding to the indoor cooling load is larger than the required amount of ventilation, when downsizing various equipment such as blowers and ducts, the temperature of the air sent into the room should be lower than the temperature of the air inside the room. Although it was desired to reduce the amount of ventilation by increasing this temperature difference, the effect of reducing the amount of ventilation due to such a temperature difference could not be expected with the conventional technology with uneven airflow distribution. The matter is as mentioned above. On the other hand, in this embodiment where the airflow distribution can be made uniform, the amount of ventilation can be reduced by sending in air with a large temperature difference, so that various equipment such as devices and ducts can be further downsized. Figure 5 shows
This is an airflow distribution diagram (the right half of FIG. 1) in the animal breeding room 1 when a large temperature difference is provided.

On the other hand, in the prior art shown in FIG. 9, the structure was complicated due to the provision of the partition 9, but in this embodiment, the structure is simple because only the arrangement of the suction port 7 is changed. Yes, it is highly practical.

In addition, as in this embodiment, the two air outlets 5 are connected to the rack 2.
If the configuration is such that they are lined up with a gap between them along the opposing surfaces, the air that is sent in from the two air outlets 5 and descends will form a large updraft in the space where there is no air outlet (32 in Figure 2). Therefore, due to the influence of this airflow, the portion of the rack 2 facing this rising airflow becomes an airflow dead zone, resulting in a drawback that ventilation efficiency is reduced. In this case, there was no room for improvement in the conventional technology in which the suction port was provided at the bottom, but in this embodiment, the suction port 7 is placed at the top of the rack 2 and placed at one end along the back surface of the rack 2. Since it is provided so as to cover almost the entire area from one end to the other end, by adjusting the speed of the air sent from the air outlet 5, it is possible to easily generate a sufficient airflow in the rack 2 in that part.

That is, in this embodiment, the speed of the air sent from the two air outlets 5 is directed from the wall side to the center side into the space above the uppermost shelf board 2a of the rack 2 in the problematic area. By setting the speed to create a flow,
As shown in FIG. 6, sufficient airflow can be generated in the same portion of the rack 2. Here, FIG. 6 is an airflow distribution diagram showing the right half of the sectional view taken along arrow C in FIG.

Note that the present invention is not limited to the above embodiments,
For example, the number of rack placement spaces, the rack height,
The number of air outlets can be selected as appropriate. Furthermore, the present invention is not limited to ventilation systems for animal breeding rooms;
It can be widely applied as a general ventilation system for various work rooms that have similar racks and require ventilation through unidirectional airflow.

[Effects of the Invention] As explained above, in the present invention, the suction port of the exhaust side space is arranged on the wall facing the back of the rack at approximately the same height as the top level of the rack. By improving the layout, we can make the airflow distribution uniform, which was previously uneven, and greatly improve ventilation efficiency throughout the room, making it possible to provide sufficient ventilation in the room with the minimum amount of ventilation required. , it is possible to provide a small, simple, and highly practical indoor ventilation system.

In addition, if the amount of supplied air corresponding to the indoor cooling load is larger than the required ventilation amount, if there is a large temperature difference between the air sent into the room and the indoor air, the ventilation amount can be further reduced, and various equipment can be made even more compact.

[Brief explanation of drawings]

1 to 3 are diagrams showing one embodiment of the indoor ventilation system according to the present invention, in which FIG. 1 is a sectional view taken along arrow A in FIG. 2, FIG. 2 is a plan view, and FIG. Figure 2 is a sectional view taken along arrow B, and Figures 4 and 5 are airflow distribution diagrams showing the right half of Figure 1. When provided, FIG. 6 is an airflow distribution diagram showing the right half of the sectional view taken along arrow C in FIG. FIG. 7 is a sectional view showing an example of a conventional indoor ventilation system, FIG. 8 is an airflow distribution diagram showing the right half of FIG. 7, and FIG. 9 is a sectional view showing a different conventional indoor ventilation system. 1...Animal breeding room, 2...Rack, 2a-2e...
・Shelf board, 3a to 3d... Arrangement space, 4... Air supply side work space, 5... Air outlet, 6... Exhaust side space, 7
... Suction port, 8a-8e... Airflow, 9... Partition.

Claims (2)

[Claims] (1) Arrange racks with multiple shelves on both sides of the room, provide an air supply work space between the racks on both sides, and install a clean ceiling on the ceiling of this air supply work space. An air outlet is provided to send air, and an exhaust side space is provided between the back of each rack and the wall facing it, which is narrower than the air supply side work space. In an indoor ventilation system equipped with a suction port that takes in air and exhausts it to the outside, the suction port is placed on the wall facing the back of the rack, between the top shelf board of the rack and the second shelf board from the top. , and the rack is located at least in a position that does not protrude directly below the air outlet, and the dimension between the back surface of the rack and the wall facing it is such that it extends from the center of the air outlet to the wall surface. An indoor ventilation system characterized in that the ventilation is 10 to 15% of the dimensions. (2) In the indoor ventilation system according to claim 1, the indoor ventilation system has a plurality of air outlets, and these air outlets are arranged side by side at arbitrary intervals along the opposing surfaces of the rack. is installed along the back of the rack so as to cover almost the entire area from one end to the other end, and the speed of the air sent from the air outlet is adjusted to the highest point of the rack in the part facing the space where no air outlet is provided. An indoor ventilation system characterized by being set at a speed that causes a flow to flow from the wall side toward the center in the space formed between the upper surface of the upper tier and the ceiling surface.