JP2023147510A - Air conditioning system of high ceiling warehouse - Google Patents

Abstract

To provide an air conditioning system of a high ceiling warehouse which enables improvement of temperature distribution in a vertical direction in the high ceiling warehouse and in an air conditioning duct extending direction on a horizontal surface and achieves low costs.SOLUTION: An air conditioning system 1 of a high ceiling warehouse Wh includes: an air conditioner 2 installed on a floor surface Fl of the high ceiling warehouse; an air conditioning duct 3 having an erection part 31 which is erected from the air conditioner 2 to a ceiling Ce and a horizontal part 32 horizontally extending from an upper part of the erection part along the ceiling; multiple through holes 32b which are provided at predetermined intervals in a longitudinal direction of the horizontal part on a lower wall 32a of the horizontal part; and multiple outlet nozzles 4 respectively inserted into the multiple through holes.SELECTED DRAWING: Figure 1

Description

The present invention relates to an air-conditioning system for a high-ceiling warehouse that stores articles within a predetermined temperature range, and more particularly, to a system suitable for air-conditioning a high-ceiling automated warehouse in which multi-tiered racks for storing articles are installed.

Referring to FIG. 10, an air conditioning system 100 for a conventional high-ceiling automated warehouse Wh includes an air conditioner 2 installed on the floor Fl, a rising section 31 that rises from the air conditioner 2 to the vicinity of the ceiling Ce, and An air conditioning duct 30 having a horizontal section 32 extending horizontally from the upper part of the section 31 along the lower surface of the ceiling Ce, and a plurality of short sections branched from the horizontal section 32 of the air conditioning duct 30 and connected via a volume damper VD. A device including a plurality of air outlets 41 provided in a pipe duct 321 is used. As the volume damper VD, for example, as disclosed in Patent Document 1 listed below, a damper installed as an air volume adjustment damper in the middle of a square duct is used, and as the air outlet 41, for example, as disclosed in Patent Document 2 listed below, is used. A grill with a shutter for adjusting the wind direction (a so-called VHS grill register type air outlet) is used. Note that a stacker crane 6 (see, for example, Patent Document 3) is used as a conveying means for automatically conveying articles (including transferring articles to and from multi-tiered racks 51 to 54) within the high-ceiling automated warehouse Wh. .

Utility model registration No. 2584735 Patent No. 3311272 Patent No. 5169211

When installing the conventional air conditioning system 100 in the high-ceiling automated warehouse Wh, the air conditioning duct 30 and the air outlet 41 are installed before the multi-stage racks 51 to 54 are installed. As mentioned above, if the height from the floor Fl to the horizontal part 32 of the air conditioning duct 30 exceeds 10 meters, the installation work is generally performed using scaffolding rather than using an aerial work vehicle. be. This scaffold for installation work becomes an obstacle to the carrying in and installation work of the multi-stage racks 51 to 54, so once the installation of the air conditioning duct 30 and the air outlet 41 is completed, it is once dismantled and removed. Thereafter, the multi-tiered racks 51 to 54 are installed, and after the racks 51 to 54 are installed, the work of carrying in and installing the stacker crane 6 as the transport equipment occurs. After that, the installation of the power panel and wiring work progressed as electrical work, and when it became possible to supply electricity to the air conditioner 2 installed on the floor Fl, the damper opening degree of the volume damper VD in the branch duct of each outlet 41 was adjusted. Air volume adjustment is performed. When adjusting the air volume, scaffolding similar to that used for installation work will be erected. As described above, in the conventional example described above, it is necessary to assemble the scaffold twice, once for installation work and once for adjusting air volume, resulting in an increase in costs. Furthermore, at the flow velocity of the air (downward flow) blown out at the VHS or HS grill register type outlet 41 within the surface velocity range that is considered appropriate, even if the flow rate of the air increases to the maximum air velocity within the surface velocity range, the air conditioner When the air volume of the built-in fan was increased and the volume damper VD was opened to adjust the wind direction at each outlet 41, even if it was directly below the outlet, the dynamic pressure of the outlet disappeared at a level of about 5 m above the floor Fl, and the air flow was near the floor Fl. It is difficult to move the air (air stagnation occurs near the floor surface Fl). In addition, the air volume can be adjusted between a plurality of air outlets 41 that are branched into many parts in the middle of the horizontal portion 32 of the air conditioning duct 30 that extends horizontally and are connected via volume dampers VD. Because of the sparse registers, there is not much differential pressure at the air outlet 41, and it is difficult to eliminate the poor static pressure distribution within the air conditioning duct 30 using only the volume damper VD, resulting in a poor distribution. In view of the balance between air volume and cost, the air outlet 41 is installed at a large interval of approximately 5 m, so that the air blows at points in terms of distribution. As a result, the temperature difference between the ceiling Ce and the floor Fl of the high-ceiling automated warehouse Wh increases, and the vertical temperature distribution within the high-ceiling automated warehouse Wh deteriorates. In order to improve the temperature distribution in the vertical direction (Z-axis direction), a vertical part 33 is lowered from the downstream end (right end in FIG. 10(b)) of the horizontal part 32 of the air conditioning duct 30 to near the floor surface Fl; Although an air outlet 42 for blowing out air from the lower end of the vertical portion 33 to the vicinity of the floor surface Fl is separately provided, this causes a further increase in cost.

The present invention was made to solve the above-mentioned problems, and is a low-cost high-ceiling warehouse that can improve the temperature distribution in the vertical direction and horizontal plane in the extension direction of air conditioning ducts in the high-ceiling warehouse. The purpose is to provide air conditioning systems.

An air conditioning system for a high-ceiling warehouse according to the present invention includes an air conditioner installed on the floor of a high-ceiling warehouse, a rising part that rises from the air conditioner to the ceiling, and a horizontal line extending from the top of the rising part along the ceiling. an air-conditioning duct having a horizontal portion extending into the horizontal portion; a plurality of through holes provided in the lower wall of the horizontal portion at predetermined intervals in the longitudinal direction of the horizontal portion; and a plurality of through holes inserted into the plurality of through holes, respectively. It is characterized by comprising a plurality of blow-off nozzles. In addition, in the present invention, when the blow-off nozzle is inserted into the through hole, it means that the upper end of the blow-off nozzle is not flush with the lower wall of the horizontal portion, but is located inside the horizontal portion. shall be taken as a thing. Furthermore, a high-ceiling warehouse is defined as a warehouse with a height of 10 m or more from the floor to the ceiling.

In the present invention, when a plurality of multi-tiered racks are arranged in parallel at intervals on the floor of the high-ceiling warehouse, the plurality of air outlets are arranged above the gaps between adjacent multi-tiered racks along the gaps. Preferably, a nozzle is arranged.

In the present invention, it is preferable that the opening diameter of the blow-off nozzle is set within the range of 65 mm to 150 mm, and the interval between the blow-off nozzles adjacent to each other is set within the range of 500 mm to 1,000 mm. If the opening diameter is smaller than 65 mm, it is necessary to increase the number of blowing nozzles, while if the opening diameter is larger than 150 mm, air cannot be blown out at high speed and the attraction effect may not be used. If the interval is wider than 1,000 mm, the blowdown effect on the surface caused by the surrounding air caused by the air blown out from the blowout nozzle at a relatively high speed of 3 to 7 m/s will be small, and the air will be large and uniform in the horizontal plane. It may become impossible to form a downdraft with a velocity distribution. On the other hand, if the interval is narrower than 500 mm, the number of blowing nozzles will be excessive.

According to the present invention, a plurality of blowout nozzles are inserted in the horizontal part of the air conditioning duct, and the upper ends of the blowout nozzles are located inside the horizontal part of the duct, so that the air flowing through the horizontal part has a large dynamic pressure component. As the static pressure of the air at the position is reacquired, air is blown downward from each blow-off nozzle at a uniform high speed regardless of the position of each blow-off nozzle. The air blown out from each blowout nozzle attracts the surrounding air, thereby forming a descending airflow with a large air volume and a uniform velocity distribution in a horizontal plane. Although the velocity of the downdraft gradually decreases as it approaches the floor, the air is still moving at a slight wind speed even near the floor. Therefore, it is possible to improve the temperature distribution in the vertical direction and horizontal plane in the air conditioning duct extension direction in the high ceiling warehouse. Moreover, since it is not necessary to adjust the air volume for each position of each blow-off nozzle regardless of the operation of the air conditioner, there is no need to install a scaffold for the air volume adjustment work. In addition, there is no need to separately install the vertical part of the air conditioning duct or the air outlet near the floor, so the scaffolding for installation only needs to be erected once, which reduces costs. can.

(a) is a plan view of an air conditioning system for a high-ceiling warehouse according to an embodiment, (b) is a sectional view taken along line Ib-Ib in FIG. FIG. (a) is a simulation result showing the flow velocity distribution in the XZ plane in this embodiment, and (b) is a simulation result showing the gas flow velocity distribution in the XZ plane in the conventional example. (a) is a simulation result showing the flow velocity distribution in the YZ plane in this embodiment, and (b) is a simulation result showing the gas flow velocity distribution in the YZ plane in the conventional example. (a) is a simulation result showing the flow velocity distribution in the XY plane at a height of 20 m in this embodiment, and (b) is a simulation result showing the flow velocity distribution in the XY plane at a height of 20 m in the conventional example. be. (a) is a simulation result showing the flow velocity distribution in the XY plane at a height of 10 m in this embodiment, and (b) is a simulation result showing the flow velocity distribution in the XY plane at a height of 10 m in the conventional example. be. (a) is a simulation result showing the temperature distribution in the XZ plane in this embodiment, and (b) is a simulation result showing the temperature distribution in the XZ plane in the conventional example. (a) is a simulation result showing the temperature distribution in the YZ plane in this embodiment, and (b) is a simulation result showing the temperature distribution in the YZ plane in the conventional example. (a) is a simulation result showing the temperature distribution in the XY plane at a height of 20 m in this embodiment, and (b) is a simulation result showing the temperature distribution in the XY plane at a height of 20 m in the conventional example. be. (a) is a simulation result showing the temperature distribution in the XY plane at a height of 10 m in this embodiment, and (b) is a simulation result showing the temperature distribution in the XY plane at a height of 10 m in the conventional example. be. (a) is a plan view of a conventional high-ceiling warehouse air conditioning system, (b) is a cross-sectional view taken along the line Xb-Xb in FIG. 10(a), and (c) is a cross-sectional view taken along the line Xc-Xc in FIG. 10(a). It is a diagram.

Embodiments will be described below with reference to the drawings. Common or corresponding elements in each figure are denoted by the same reference numerals, and description thereof will be simplified or omitted. In each figure, illustration of some components may be omitted for convenience of drawing.

FIG. 1(a) is a plan view of an air conditioning system 1 for a high-ceiling automated warehouse Wh according to an embodiment, and FIG. 1(b) is a sectional view taken along line Ib-Ib in FIG. 1(a). c) is a sectional view taken along line Ic-Ic in FIG. 1(a). In this embodiment, the longitudinal direction of the horizontal part 32 of the air conditioning duct 3 is the X-axis direction, the vertical direction is the Z-axis direction, and the multi-stage racks 51 to 54, which will be described later, are aligned at right angles to the X-axis direction and the Z-axis direction. The installation direction is the Y-axis direction.

The air conditioning system 1 includes three air conditioners 2 installed on the floor Fl of a high-ceiling automated warehouse Wh, three air conditioning ducts 3 connected to each air conditioner 2, and a horizontal A plurality of air outlets 4 provided in the section 32 are provided.

The air conditioner 2 sucks air from the high-ceiling automated warehouse Wh through an intake port (not shown), cools or heats (heats in this embodiment) return air, and sends the heated air to the air conditioning duct 3. It is composed of As the air conditioner 2, for example, a known type including a cooling coil and a hot water coil can be used, so further explanation will be omitted. In addition, the air conditioning duct 3 can be selected with a pressure loss of, for example, about 0.2 mmAq/m, and in that case, for example, if the air conditioner 2 has an air volume of 8,000 CMH, each side of the cross section of the air conditioning duct should be 700 mm x 500 mm. Since only a few can be used, further explanation will be omitted.

The air conditioning duct 3 has a rising part 31 that rises from the air conditioner 2 to a predetermined height near the ceiling Ce, and a horizontal part 32 that extends horizontally from the top of the rising part 31 along the lower surface of the ceiling Ce in the X-axis direction. , has. A plurality of through holes 32b are formed in the lower wall 32a of the horizontal portion 32 at equal intervals in the X-axis direction. A plate-shaped fixing member 34 having a larger area than the through hole 32b is attached to each through hole 32b from below by adhesive, welding, or the like. A through hole 34a is formed in the center of the fixing member 34, and has a threaded groove corresponding to a thread of a cylindrical portion 4a of the blowing nozzle 4, which will be described later. The blow-off nozzle 4 can be easily adjusted and installed if the cylindrical portion 4a has a thread and the through hole 34a has a thread groove, but this is not limiting, and other types of fixing may be used as long as a certain insertion allowance can be secured. In addition, in this embodiment, the horizontal part 32 is formed so that the cross-sectional area becomes gradually smaller toward the downstream side, but it may be formed to have a constant cross-sectional area. Further, in this embodiment, three air conditioners 2 are provided corresponding to the three air conditioning ducts 3, but one air conditioner 2 may be used also by three air conditioning ducts 3. In this case, the structure can be such that the rising part 31 that is raised from the air conditioner 2 branches into three horizontal parts 32 from the upper part.

In this embodiment, a plurality of blow-off nozzles 4 are inserted into the horizontal portion 32, respectively. The blow-off nozzle 4 includes a cylindrical tube portion 4a and a blow-off portion 4b that is integrally formed at the lower end of the tube portion 4a and extends with a constant diameter. The opening diameter Dn at the lower end of the blowing portion 4b can be set within a range of 65 mm to 150 mm. Thereby, air can be blown out from the blow-off nozzle 4 at high speed. When the opening diameter Dn is smaller than 65 mm, it is necessary to significantly increase the number of blowing nozzles 4, while when the opening diameter Dn is larger than 150 mm, air may not be able to be blown out at high speed. A thread that corresponds to (screws into) the thread groove of the through hole 34a is formed on the outer surface of the cylindrical portion 4a. Then, when the blow-off nozzle 4 is rotated with its cylindrical portion 4 a facing upward and in contact with the through-hole 34 a, the blow-off nozzle 4 is inserted into the horizontal portion 32 . Not limited to this, other types of fixing may be used as long as a certain insertion fee can be secured. That is, the upper end of the blow-off nozzle 4 is not flush with the lower wall 32a of the horizontal section 32, but is located inside the horizontal section 32. As a result, the upper end of the blowout nozzle 4 is located inside the horizontal section 32, so that the static pressure of the air near the center, where the air flowing through the horizontal section 32 has a large dynamic pressure component, is reacquired. Air is blown out from the nozzles 4 downward at a uniform high speed regardless of the position of each blowing nozzle 4. The insertion length Ln of the cylindrical portion 4a is set such that the upper end of the cylindrical portion 4a is located at a position where it is not affected by a decrease in flow velocity due to frictional resistance on the inner surface of the horizontal portion 32. Note that it is not necessary to make the insertion lengths Ln of each blow-off nozzle 4 exactly the same, and even if the insertion lengths Ln are slightly different, as long as the upper end is inserted to the vicinity of the center of the horizontal portion 32, each blow-off nozzle 4 The flow velocity of the air blown out remains almost unchanged. The interval Sn between adjacent blow-off nozzles 4 is preferably set within the range of 500 mm to 1,000 mm. According to this, in combination with setting the opening diameter Dn of the blowing portion 4b within the above range, the attraction effect described later can be reliably obtained. If the interval Sn is wider than 1,000 mm, the attraction effect will be reduced, and it may become impossible to form a descending airflow with a large amount of air. On the other hand, if the interval Sn is narrower than 500 mm, the number of blow-off nozzles 4 will be excessive. Further, in the case where the horizontal portion 32 is relatively thick and made of a relatively hard material such as stainless steel, a thread groove may be directly cut into the through hole 32b. In this case, since the fixing member 34 can be omitted, the number of parts can be reduced, which is advantageous. Not limited to this, other types of fixing may be used as long as a certain insertion fee can be secured.

In the high-ceiling automated warehouse Wh, a plurality of (four in the present embodiment) multi-tiered racks 51 to 54 are arranged in parallel in the Y-axis direction with a plurality of (four in the present embodiment) longitudinal racks arranged at intervals in the Y-axis direction. It is set up. Each of the multistage racks 51 to 54 stores articles (not shown). In this embodiment, the gap S2 between the two multi-stage racks 52, 53 adjacent on the inside in the Y-axis direction is the gap S2 between the multi-stage racks 52, 53 and the multi-stage racks 51, 54 on the outside in the Y-axis direction, respectively. It is set smaller than S1 and S3. The horizontal portion 32 is arranged above these gaps S1, S2, and S3 in the Z-axis direction. Thereby, a plurality of blow-off nozzles 4 are arranged above the gaps S1, S2, S3 and along the gaps S1, S2, S3. By arranging the blowout nozzles 4 in this way, the air blown out from each blowout nozzle 4 and the downward airflow described below can secure a space in which they can reach the floor surface Fl, and also allow the air to enter the inside of the multi-stage racks 51 to 54. It becomes easier. Furthermore, two rows of stacker cranes 6 are installed outside the multi-stage racks 51 and 54 in the Y-axis direction for loading and unloading articles from each shelf storage section of the multi-stage racks 51 to 54. The stacker crane 6 automatically transports articles within the high-ceiling automated warehouse Wh (including the delivery of articles to the multi-tiered racks 51 to 54), and is driven and controlled by a computer (not shown). As the multistage racks 51 to 54 and the stacker crane 6, known ones can be used, so further explanation will be omitted.

According to this embodiment, since the plurality of blowout nozzles 4 are inserted into the horizontal portion 32 of the air conditioning duct 3, the air flowing through the horizontal portion 32 is blown out from each blowout nozzle 4 downward at high speed. The air blown out from each blowout nozzle 4 attracts the surrounding air, thereby forming a descending airflow with a large air volume and a uniform flow velocity in the horizontal plane (XY plane). The downdraft reaches the floor Fl, although its flow velocity gradually decreases as it approaches the floor Fl. Therefore, air stagnation does not occur near the floor surface Fl, improving temperature distribution in the vertical direction (Z-axis direction) and horizontal plane in the air conditioning duct extension direction (X-axis direction) inside the high-ceiling automated warehouse Wh. be able to. Moreover, since there is no need to adjust the air volume of the blow-off nozzle 4 (adjustment of the insertion length Ln), there is no need to install a scaffold for the air volume adjustment work. Furthermore, since there is no need to separately provide the hanging part 33 of the air conditioning duct 30 or the air outlet 42 near the floor surface Fl as in the conventional example, this also allows the scaffolding for the installation work to be erected once. , it is possible to realize cost reduction.

In this embodiment, in order to confirm the temperature distribution in the vertical direction inside the high-ceiling automated warehouse Wh, a simulation was performed under the following conditions. That is, the distance from the floor Fl to the ceiling Ce is 24,000 mm (24 m), the duct dimensions (each side in cross section) of the air conditioning duct 3 are 700 mm x 500 mm, the opening diameter Dn of the blowing nozzle 4 is 80 mm, and the interval Sn is 700 mm, and the insertion length Ln was 100 mm. In addition, in a conventional example compared with this embodiment, as shown in FIG. 10, VHS grill register type air outlets 41 are used, the interval between the air outlets 41 is 5,000 mm, and the descending portion 33 and the air outlet 42 are separated. The simulation conditions were the same as in the embodiment except for the points provided separately.

In this embodiment, with reference to FIGS. 2(a) and 3(a), the flow velocity of the air blown out from each blow-off nozzle 4 was 4.5 m/s; It was confirmed that the wind speed of the downflow airflow at a level below 500 mm was as high as 0.25 m/s. Referring also to FIG. 4(a), the airflow blown out from each blowout nozzle 4 attracts the surrounding air, thereby forming a descending airflow with a large air volume and a uniform flow velocity distribution within the XY plane. was confirmed. Referring also to FIG. 5(a), it was found that although the velocity of the downdraft gradually decreases as it approaches the floor surface Fl, the air moves at a slight wind speed even near the floor surface Fl. Furthermore, as clearly shown in FIGS. 3(a) and 4(a), it was also confirmed that air entered the interior of the multi-stage racks 51 to 54. It is presumed that this is because a descending airflow with a large air volume and a uniform velocity distribution in the XY plane is formed due to the attraction effect.

In this embodiment, when the above-mentioned downdraft reaches the floor surface Fl, as shown in FIGS. 6(a) and 7(a), the vicinity of the ceiling Ce of the high ceiling warehouse Wh becomes 19 ℃, about 17.5℃ at the center level of the high-ceiling warehouse Wh, and about 16.5℃ near the floor surface Fl. As a result, the temperature distribution in the vertical direction inside the high-ceiling warehouse Wh is similar to the conventional example described below. It was confirmed that there was an improvement in comparison. Furthermore, as shown in FIGS. 8(a) and 9(a), it was confirmed that the temperature distribution in the XY plane at heights of 20 m and 10 m was also improved. It is presumed that this is due to air entering the multi-stage racks 51-54.

On the other hand, in the conventional example, referring to FIGS. 2(b) and 3(b), the flow velocity of the air blown out from each outlet 41 is 0.25 m/min directly below the air outlet 41 while maintaining its dynamic pressure. s, but the flow velocity of the surrounding air was low at less than about 0.10 m/s, and it was confirmed that because the blowing wind speed was low, almost no force was generated to attract the surrounding air. From this, it was found that the attraction effect as in the present embodiment could not be obtained and the descending airflow did not have a large air volume. Referring also to FIG. 4(b) and FIG. 5(b), it was confirmed that the flow velocity distribution of the downdraft in the XY plane is non-uniform, and the flow velocity decreases rapidly as it approaches the floor surface Fl. . For this reason, although not shown in the drawings, it has been found that the descending airflow will not reach the floor surface Fl unless the vertical part 33 and the air outlet 42 are separately provided. The reason why the flow velocity is high near the floor surface Fl in FIG. 2(b) is that air is blown out from the air outlet 42 near the floor surface Fl. Furthermore, as shown in FIGS. 3(b) and 4(b), it was confirmed that air did not enter inside the multi-stage racks 51 to 54 as much as in the embodiment. This is presumed to be because the flow velocity is locally high directly below each outlet 41 and the flow velocity distribution within the XY plane is non-uniform.

In the conventional example, although the vertical part 33 and the air outlet 42 are separately provided, as shown in FIGS. 6(b) and 7(b), the air outlet near the ceiling Ce of the high-ceiling warehouse Wh. Even though the temperature directly below 42 is as high as about 22°C, it is 16.8°C at the center level of the high ceiling warehouse Wh and about 15.5°C near the floor Fl, so the temperature distribution in the vertical direction is was confirmed to be worse than the embodiment. Furthermore, as shown in FIGS. 8(b) and 9(b), it was confirmed that the temperature distribution in the XY plane at heights of 20 m and 10 m was also worse than in the embodiment. This is presumed to be because the amount of air entering the multi-stage racks 51 to 54 is smaller than in the embodiment.

Although the present embodiment has been described using an example of heating operation, the present invention can also be applied to cooling operation. It was confirmed that the temperature distribution in the vertical direction inside the high-ceiling automated warehouse Wh also improved during the cooling operation.

In addition, in this embodiment, an example has been described in which the application is applied to a high-ceiling automated warehouse Wh in which a stacker crane 6 for automatically transporting articles is installed, but the stacker crane 6 may not be installed, and the floor surface Fl The present invention can be widely applied to high-ceiling warehouses where the height from ceiling Ce to ceiling Ce is 10 m or more.

Wh high-ceiling automated warehouse (high-ceiling warehouse), Fl floor surface, Ce ceiling, 1 air conditioning system, 2 air conditioner, 3 air conditioning duct, 31 rising part, 32 horizontal part, 32a lower wall, 32b through hole, 4 blowing nozzle , 51, 52, 53, 54 Multi-stage rack

Claims (3)

An air conditioner installed on the floor of a high-ceiling warehouse,
an air conditioning duct having a rising part rising from the air conditioner to the ceiling and a horizontal part extending horizontally from the top of the rising part along the ceiling;
a plurality of through holes provided in the lower wall of the horizontal portion at predetermined intervals in the longitudinal direction of the horizontal portion;
An air conditioning system for a high ceiling warehouse, comprising: a plurality of blowout nozzles inserted into the plurality of through holes, respectively. The air conditioning system for a high-ceiling warehouse according to claim 1, wherein a plurality of multi-stage racks are arranged in parallel at intervals on the floor of the high-ceiling warehouse,
An air conditioning system for a high-ceiling warehouse, characterized in that the plurality of blow-off nozzles are arranged at intervals above a gap between mutually adjacent multi-stage racks along the gap. The opening diameter of the blowing nozzle is set within a range of 65 mm to 150 mm,
The air conditioning system for a high-ceiling warehouse according to claim 1 or 2, wherein an interval between the blow-off nozzles adjacent to each other is set within a range of 500 mm to 1,000 mm.

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