JP2023058226A - Displacement air conditioning method - Google Patents

Abstract

To provide a displacement air conditioning method which enables improvement of workers' comfort and provides an environment, such as a stable temperature, to devices.SOLUTION: An air conditioning method of the disclosure is used to maintain an air conditioned area 10, formed from a floor surface 1b to a predetermined height at a lower part of an air conditioned space 11, in a predetermined environment. When air-conditioned air is supplied from an air supply port 25 to the lower side of the air conditioned space 11, the air is supplied in a state that the air supply port 25 is spaced apart from a side wall 1a, forming the air conditioned space 11, by a predetermined distance L.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to displacement air conditioning methods.

As a technology related to displacement air conditioning, Patent Document 1 describes "an air supply opening for supplying air that has been temperature controlled and purified by passing it through a filter into the clean room from the ceiling surface of the clean room, and returns the air in the clean room. A clean room air conditioning system characterized by having a suction opening for sucking in as a clean air, wherein the air velocity of clean air supplied into the clean room from the air supply opening is 1 m / s or less." there is

JP 2017-219219 A (Claim 1)

In the replacement air-conditioning method of the present disclosure, the air-conditioning target area, which is the area where workers work and the area occupied by devices, exists in the lower part of the air-conditioning target space where replacement air-conditioning is performed, and utilizes the density difference caused by temperature. Only the lower part is air-conditioned by stratifying the temperature.

In the technique described in Patent Document 1, clean air is blown out from an air supply opening formed in the ceiling of a clean room at a wind speed of 1 m/s or less to perform replacement air conditioning (claim 1, paragraph 0022). However, according to the study of the present inventor, in the technique described in Patent Document 1, the feet of the worker in the work area may be cold and the upper body (head, etc.) may become warm, making the worker feel uncomfortable. something happened.
The problem to be solved by the present disclosure is to provide a replacement air-conditioning method that improves the comfort of workers and provides a stable environment such as temperature for equipment.

The air-conditioning method of the present disclosure is a replacement air-conditioning method for maintaining an air-conditioned area, which is formed at a predetermined height from the floor below the air-conditioned space, in a predetermined environment. When air is supplied downward into the air-conditioned space, the air supply port is separated from the side wall forming the air-conditioned space by a predetermined distance.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide a replacement air conditioning method that improves the comfort of workers and provides an environment such as a stable temperature for devices.

1 is a schematic diagram of an air conditioning system according to one embodiment; FIG. FIG. 10 is a diagram for explaining how conditioned air Ac supplied from an air supply port flows, in the case where there is a predetermined distance L; FIG. 10 is a diagram for explaining how conditioned air Ac supplied from an air supply port flows, in the case where there is no predetermined distance L; FIG. 3 is a schematic diagram of an air conditioning system of another embodiment; FIG. 3 is a schematic diagram of an air conditioning system of another embodiment; FIG. 3 is a schematic diagram of an air conditioning system of another embodiment; FIG. 3 is a schematic diagram of an air conditioning system of another embodiment; FIG. 4 is a schematic diagram showing the configuration of a device that performs temperature control using a blower fan installed in an isolated space; 4 is a flow chart showing temperature control using a blower fan installed in an isolated space. FIG. 4 is a schematic diagram showing another device configuration for executing cleanliness control; 4 is another flow chart showing cleanliness control;

Hereinafter, modes for carrying out the present disclosure (referred to as embodiments) will be described with reference to the drawings. In the following description of one embodiment, other embodiments applicable to the one embodiment will also be described as appropriate. The present disclosure is not limited to one embodiment below, and different embodiments can be combined or arbitrarily modified within a range that does not significantly impair the effects of the present disclosure. Also, the same members are denoted by the same reference numerals, and overlapping descriptions are omitted. Furthermore, those having the same function shall have the same name. The contents of the drawings are only schematic, and for the convenience of the drawings, the actual configuration may be changed within a range that does not significantly impair the effects of the present disclosure, or the illustration of some members may be omitted or modified between drawings. sometimes

FIG. 1 is a schematic diagram of an air conditioning system 100 (replacement air conditioning system) of a first embodiment that implements a replacement air conditioning method according to the present disclosure. The replacement air-conditioning method of the present disclosure is a method for maintaining an air-conditioned area 10 formed in a lower part of an air-conditioned space 11 up to a predetermined height from the floor surface 1b in a predetermined environment. The lower part here is the lower part of the air-conditioned space 11 that occupies the entire inside of the air-conditioned room 1 . In the air-conditioning system 100, the room 1 to be air-conditioned is a clean room, and the air conditioner 2 is provided above it. An air-conditioned space 11 is formed inside the air-conditioned room 1. In the illustrated example, the air-conditioned space 11 is an internal space of a clean room. The air-conditioned area 10 is a lower area within the air-conditioned space 11 . The air conditioner 2 is installed in the air-conditioned space 11 . The air conditioner 2 supplies conditioned air Ac and has an air supply port 25 .

In an air-conditioned room 1, there are devices 3 and workers 4 that serve as heat load sources and dust sources.

In the air-conditioned room 1, apart from the operation of the air conditioner 2, outside air required to maintain the positive pressure in the room is maintained so that polluted air outside the air-conditioned room 1 does not flow into the air-conditioned room 1. It is adjusted by the adjuster 5. Then, the adjusted outside air is supplied through the duct 6a and the first inlet 7, and surplus air is discharged outside the system of the air-conditioned room 1 through the exhaust port 8 and the duct 6b.

The dashed-dotted line in FIG. 1 is a virtual line 9 indicating the upper limit of the air-conditioned area 10 in the air-conditioned room 1 where temperature control and cleanliness control are required, and there is no partition such as a ceiling. The area below the height of the line 9 is the air-conditioned area 10 of the air-conditioned room 1 .
The height of the air-conditioned area 10 is set to a height that exceeds the height of the equipment 3 and the height of the worker 4, and is generally about 2 m, but may be 3 m to 4 m depending on the height of the equipment 3. may be set to

The air conditioner 2 includes an intake port 21 for sucking air in the air-conditioned space 11 , a cooling mechanism 22 for cooling the sucked air in the air-conditioned space 11 , and an air supply port 25 . The air supply port 25 supplies the conditioned air Ac adjusted by the cooling mechanism 22 toward the lower side of the air conditioner 2 . However, since the air-conditioned room 1 is an embodiment as a clean room, a blower fan 23 and a high-performance dust removal filter 24 as a filter are provided between the cooling mechanism 22 and the air supply port 25. explain.

The air conditioner 2 sucks the air in the air-conditioned room 1 by operating the blower fan 23 and cools the air when passing through the cooling mechanism 22 . Furthermore, the air conditioner 2 includes a high-performance dust filter 24 (an example of a filter) that removes dust, and the high-performance dust filter 24 removes dust in the air. The air conditioner 2 is configured such that the air that has passed through the high performance dust removal filter 24 is supplied through the air supply port 25 . That is, the air conditioner 2 blows and supplies air (conditioned air Ac) that has been air-conditioned and dust-removed through the air supply port 25 downward to the air-conditioned room 1 .

The conditioned air Ac blown downward from the air supply port 25 moves downward while attracting and mixing surrounding air (surrounding air Aa). At this time, the descending wind speed is attenuated and the amount of air moving downward along with it increases according to the amount of air to be attracted and mixed. At the same time, the temperature of the downwardly moving air will be higher than the temperature of the conditioned air Ac blown from the inlet 25, depending on the amount of ambient air Aa it attracts and mixes.
Through this series of operations, the temperature of the conditioned air Ac reaching the air-conditioned area 10 becomes higher than the temperature when the conditioned air Ac is blown out from the air supply port 25, and the upper and lower temperatures of the air-conditioned area 10 It works to reduce the difference. In addition, since the conditioned air Ac is supplied to the air-conditioned area 10 by the air conditioner 2, the dust count in the air-conditioned area 10 is kept below a certain value.

Here, in the air supply port 25 of the air conditioner 2, the side wall 1a inside the air-conditioned room 1 (an example of the side wall forming the air-conditioned space 11) and the air supply port 25 are separated by a predetermined distance L. is installed as follows. Therefore, in the replacement air-conditioning method of the present disclosure, when the conditioned air Ac is supplied from the air supply port 25 toward the lower side of the air-conditioned space 11, the conditioned air Ac passes through the air supply port 25 at a predetermined distance from the side wall 1a. Air is supplied remotely.

2 and 3 are diagrams for explaining how the conditioned air Ac supplied from the air supply port 25 of the air conditioner 2 flows. FIG. 2 shows the case where there is a predetermined distance L, that is, the case where the side wall 1a is separated from the air conditioner 2 and the air supply port 25. As shown in FIG. FIG. 3 shows the case where the side wall 1a, the air conditioner 2, and the air supply port 25 are in contact with each other without separation, that is, the case where the predetermined distance L does not exist.

As shown in FIG. 3, when the air conditioner 2 is installed in contact with the side wall 1a, the air supplied downward from the air supply port 25 cannot induce ambient air Aa from the side wall 1a. On the other hand, as shown in FIG. 2, when the air conditioner 2 and the side wall 1a are separated, in addition to the induction from the inside of the air-conditioned room 1, the surrounding air Aa can also be drawn from the side wall 1a side. becomes.
As a result, the ambient air Aa is attracted to and mixed with the conditioned air Ac, and the amount of air to be mixed increases, thereby promoting the effect of reducing the upper and lower temperature difference in the air-conditioned area 10 .

This predetermined distance L is, for example, a distance at which the ambient air Aa is likely to be attracted by the conditioned air Ac supplied from the air supply port 25 . The predetermined distance L is preferably wider (longer) in that it does not hinder the attraction, but can be determined by simulation, for example, and is specifically 600 mm or more, but is not limited to this numerical range.

FIG. 4 is a schematic diagram of an air conditioning system 100 of another embodiment. A first inlet 7 is arranged in the air-conditioned space 11 . The first inlet 7 is for maintaining the air-conditioned room 1 at a positive pressure with respect to the outside so that the contaminated air outside the air-conditioned room 1 does not flow into the air-conditioned room 1. is introduced into the air-conditioned space 11 through the duct 6a.

The air conditioner 2 and the first inlet 7 are preferably arranged in the vicinity. Specifically, the first inlet 7 and the suction port 21 of the air conditioner 2 are preferably provided in the vicinity. The neighborhood here is, for example, within 1 m. By installing the first introduction port 7 and the suction port 21 for introducing the outside air in the vicinity, the temperature and humidity are adjusted by the outdoor air conditioner 5, and the outside air after the adjustment of cleanliness is supplied to the room to be air-conditioned. It hardly mixes with the air in the upper part of the air conditioner 1 and is quickly introduced into the air conditioner 2 from the suction port 21 . This makes it possible to efficiently use the air-conditioned outside air.

FIG. 5 is a schematic diagram of an air conditioning system 100 of another embodiment. In the example shown in FIG. 5, the air conditioner 2 includes a second inlet 7a that directly introduces outside air that has been air-conditioned by the outdoor air conditioner 5 into the air conditioner 2 via a duct 6a.

In this way, by directly introducing the outside air air-conditioned by the outdoor air conditioner 5 to the air conditioner 2 via the duct 6a and the second inlet 7a, the temperature and humidity are adjusted by the outdoor air conditioner 5, and the air is cleaned. The adjusted outside air that has been thoroughly adjusted is introduced into the air conditioner 2 without being mixed with the air in the upper part of the air-conditioned room 1 at all. Even in this way, the air-conditioned outside air can be used efficiently.

FIG. 6 is a schematic diagram of an air conditioning system 100 of another embodiment. In the example shown in FIG. 6, the air-conditioning system 100 includes dust removers 26a and 26b for sucking and removing dust from the air-conditioned space 11 inside the air-conditioned room 1. The dust removers 26a and 26b are the air-conditioned space 11 ( Specifically, it is arranged in the air conditioning target area 10).

Such dust removers 26a and 26b are provided because the air conditioning air volume (A) required for heat treatment of the heat load source in the air-conditioned room 1 or air-conditioned area 10 and the air conditioning required based on the required cleanliness level. This is the case where the difference from the air volume (B) is large and A<B.

The dust removers 26a and 26b include a high-performance dust filter 24a having a dust remover function, a blower fan 23a, and a casing 27a.

Further, when the heat treatment function and the dust removal function are separated, the high performance dust removal filter 24 of the air conditioner 2 does not have to be provided.

The installation position and the number of installed dust removers 26 are not limited to those shown in FIG. 6, and the required number may be installed in the required direction and position.

FIG. 7 is a schematic diagram of an air conditioning system 100 of another embodiment. In the example shown in FIG. 7, a blower fan 23b is provided between the air conditioner 2 and the side wall 1a of the air-conditioned room 1 to generate a downward airflow. The replacement air conditioning method of the present disclosure drives the blower fan 23b. By providing the blower fan 23b, the air in the upper part of the air-conditioned room 1 is introduced downward through the space between the air conditioner 2 and the side wall 1a, and the low-temperature air supplied from the air supply port 25 is reliably separated. It becomes possible to attract and mix in In addition, even if the predetermined distance L is short (narrow) and it is difficult for the conditioned air Ac to attract the ambient air Aa (FIG. 2), a forced airflow is generated between the air conditioner 2 and the side wall 1a to attract and mix the air. can promote

FIG. 8 is a schematic diagram showing the configuration of a device that performs temperature control using a blower fan 23b installed in an isolated space. The blower fan 23b is housed in a casing 27b. The casing 27b includes an air supply port 27c and a suction port 27d arranged at a position higher than the air supply port 27c. In the illustrated example, the air supply port 27c is provided in the lower portion of the casing 27 (below the blower fan 23b), and the suction port 27d is provided in the upper portion of the casing 27 (above the blower fan 23b). By driving the blower fan 23b, air in the air-conditioned room 1 (air existing above the air-conditioned space 11) is sucked through the suction port 27d and supplied downward through the air supply port 27c. In the illustrated example, the suction port 27d is provided in the upper portion of the casing 27 (above the blower fan 23b), but is not limited to this, and may be positioned at the same height as the casing 27 or lower. In some cases, the air may be drawn from above the air-conditioned area 10 .

Temperature control by the blower fan 23 b installed in the isolated space is performed by the temperature sensor 28 , the control device 29 and the air volume control mechanism 30 . A temperature sensor 28 is installed in the air-conditioned area 10 . The control device 29 outputs an operation signal for the blower fan 23b based on the temperature T of the air-conditioned area 10 measured by the temperature sensor 28 . The air volume control mechanism 30 controls the volume of air supplied from the blower fan 23b based on the operation signal from the control device 29. As shown in FIG. The blower fan 23b has its rotation speed controlled by an inverter as an air volume control mechanism 30 . The temperature sensor 28, the control device 29, the air volume control mechanism 30, and the blower fan 23b are connected by electrical signal lines indicated by dashed lines.

FIG. 9 is a flow chart showing temperature control using the blower fan 23b installed in the isolated space. In the replacement air conditioning method of the present disclosure, the air volume control mechanism 30 controls the air volume supplied by the blower fan 23 b based on the temperature of the air conditioning target area 10 . Specifically, first, the control device 29 determines whether or not the temperature T of the air-conditioned area 10 measured by the temperature sensor 28 (step S11) is lower than the set temperature (step S12).

When the measured temperature T is lower than the set temperature (Yes), the control device 29 controls the air volume control mechanism 30 to increase the rotational speed of the blower fan 23b so as to increase the amount of induced air. The amount of air passing through is increased (step S13). On the other hand, in step S12, if the measured temperature T is equal to or higher than the set temperature (No), the controller 29 slows down the rotation speed of the blower fan 23b to reduce the amount of induced air. is lowered (step S14). The temperature T of the air-conditioned area 10 is controlled by executing these operations in fixed time steps.

In step S12, the air volume control mechanism 30 may maintain the rotation speed of the blower fan 23b at the current state by setting a range within ±several degrees Celsius of the set temperature as a dead temperature zone.

Note that the above-described temperature control of the air-conditioned area 10 according to the present disclosure may be performed in combination with temperature control of the air-conditioned area 10 by changing the supply air temperature of the air conditioner 2 .

FIG. 10 is a schematic diagram showing the configuration of an apparatus for executing cleanliness control using a blower fan 23b installed in a separated space. Cleanliness control by the blower fan 23 b is performed by the air volume control mechanism 30 , the cleanness sensor 31 and the control device 29 . The cleanliness sensor 31 measures the cleanliness (for example, dust concentration C) of the air-conditioned area 10 . The control device 29 outputs a control signal to the air volume control mechanism 30 based on the dust concentration C contained in the air in the air-conditioned area 10 measured by the cleanliness sensor 31 . The cleanliness sensor 31, the controller 29, and the air volume control mechanism 30 are connected by electric signal lines indicated by dashed lines.

FIG. 11 is a flow chart showing cleanliness control using the blower fan 23b installed in the isolated space. In the replacement air conditioning method of the present disclosure, the amount of air supplied by the blower fan 23b is controlled by the air volume control mechanism 30 based on the cleanliness of the air-conditioned area 10 . Specifically, first, the control device 29 determines whether the dust concentration C (step S21) related to the cleanliness of the air-conditioned area 10 measured by the cleanliness sensor 31 is higher than the dust concentration related to the specified cleanliness. (step S22).

When the measured dust concentration C is higher than the dust concentration related to the specified cleanliness (Yes), the control device 29 controls the air volume control mechanism 30 to reduce the rotation speed of the blower fan 23b so as to reduce the amount of induced air. , the amount of air supplied via the blower fan 23b is reduced (step S23). This is because more dust is present around the suction port 27 d above the air-conditioned space 11 than below the air-conditioned space 11 due to the replacement air-conditioning of the air-conditioned space 11 . Here, the cleanliness sensor 31 is arranged below the suction port 27d and the air supply port 27c. When a large dust concentration C is measured by the cleanliness sensor 31 arranged at this position, the rotational speed of the blower fan 23b is controlled to be slow in order to reduce the intake amount of air containing a large amount of dust present in the upper part. be.

On the other hand, in step S22, when the measured dust concentration C is equal to or lower than the dust concentration related to the specified cleanliness level (No), the control device 29 controls the air volume control mechanism 30 to increase the rotation speed of the blower fan 23b, The amount of air supplied through the blower fan 23b is increased (step S24). This is because it is determined that the environment in the lower part satisfies the specified cleanliness level, and the rotational speed of the blower fan 23b is controlled to be high in order to promote the attraction and mixing that contribute to the suppression of the upper and lower temperature difference. The cleanliness of the air-conditioned area 10 is controlled by executing these operations in fixed time steps.

In step S22, the air volume control mechanism 30 may maintain the rotation speed of the blower fan 23b at the current state by setting a range within the specified dust concentration±the dead zone dust concentration as the dead dust concentration zone.

The control device 29 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), etc., although none of them are shown. The control device 29 is embodied by developing a predetermined program (control program) stored in the ROM into the RAM and executing it by the CPU. The program referred to here is for causing a computer to execute the air conditioning system 100 described above.

In the illustrated examples shown so far, the air-conditioned space 11 is the internal space of a clean room, but it may be applied to each space such as a factory, a hall, or a room for other purposes.

According to the replacement air-conditioning method of the present disclosure, by installing the air conditioner 2 away from the side wall 1a, it is possible to create a good induction state and control the environment of the air-conditioned area 10 by various methods. For this reason, the supply of low-temperature air, which is a factor that hinders the comfort of the worker 4, to the air-conditioned area 10 is suppressed, the upper and lower temperature difference is reduced, and the comfort is improved. can provide a stable temperature environment.

By supplying the conditioned air Ac to the air-conditioned area 10 in the lower part of the air-conditioned room 1 forming the air-conditioned space 11 in which replacement air-conditioning is performed, the air-conditioned air Ac is less than the method of mixing and air-conditioning the entire air-conditioned room 1. It can efficiently air-condition with air volume and contribute to energy saving.
In addition, since the indoor air is circulated through the air conditioner 2 arranged in the air-conditioned room 1, it is necessary to convey the indoor air to the outside of the air-conditioned room 1 through a duct and return it to the outdoor air conditioner 5 or the like. Gone. Therefore, it is possible to reduce the energy required for pneumatic transportation.

Furthermore, the air conditioner 2 can be installed at a position higher than the air-conditioned area 10, the footprint in the air-conditioned room 1 is improved, and the degree of freedom in installing the devices 3 is improved. Along with this, it becomes easier to deal with changes in the layout of the air-conditioned room 1 .

1 Air-conditioned room 10 Air-conditioned area 100 Air-conditioning system 11 Air-conditioned space 1a Side wall 1b Floor surface 2 Air conditioner 21 Suction port 22 Cooling mechanism 23 Blower fan 23a Blower fan 23b Blower fan 24 High performance dust removal filter 24a High performance dust removal filter 25 Supply Air port 26 Dust remover 26a Dust remover 26b Dust remover 27 Casing 27a Casing 27b Casing 27c Air supply port 27d Suction port 28 Temperature sensor 29 Control device 3 Devices 30 Air volume control mechanism 31 Cleanliness sensor 4 Worker 5 Outdoor air conditioner 6a Duct 6b Duct 7 First inlet 7a Second inlet 8 Exhaust port 9 Line A Air-conditioning air volume Aa Ambient air Ac Air-conditioning air B Air-conditioning air volume C Dust concentration L Predetermined distance

Claims (6)

A replacement air-conditioning method for maintaining an air-conditioned area formed at a predetermined height from a floor surface in a lower part of an air-conditioned space in a predetermined environment,
In supplying the conditioned air from the air supply port toward the lower part of the air-conditioned space,
A replacement air-conditioning method, wherein the air supply port is separated from a side wall forming the air-conditioned space by a predetermined distance and air is supplied. An air conditioner that supplies conditioned air and has the air supply port is installed in the air-conditioned space,
The air conditioner further
a suction port for sucking air in the air-conditioned space;
a cooling mechanism that cools the sucked air in the air-conditioned space;
configured with
The replacement air conditioning method according to claim 1, wherein the air supply port supplies the conditioned air adjusted by the cooling mechanism downwardly of the air conditioner. The replacement air-conditioning method according to claim 1 or 2, wherein the predetermined distance is a distance at which ambient air is likely to be attracted by the conditioned air supplied from the air supply port. 3. The displacement air conditioner according to claim 1 or 2, wherein a blower fan provided between the side wall and the side wall of the air conditioner provided with the air supply port is driven to generate a downward air flow. Method. 5. The replacement air conditioning method according to claim 4, wherein an air volume control mechanism for controlling an air volume supplied by the blower fan controls an air volume supplied by the blower fan based on the temperature of the air-conditioned area. 5. The replacement air conditioning method according to claim 4, wherein an air volume control mechanism that controls an air volume supplied by the blower fan controls an air volume supplied by the blower fan based on the cleanliness of the air-conditioned area.

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