KR102217513B1 - Noise reduction cooling tower - Google Patents

Abstract

The present invention relates to a noise reduction cooling tower. An aspect of the noise reduction cooling tower according to an embodiment of the present invention includes a casing in which an intake port through which air is sucked is formed on at least one side and an exhaust port through which air is discharged is formed on an upper surface; A water supply unit supplying cooling water that is heat-exchanged with air sucked through the intake port; A blower comprising a blower fan configured to form a flow of air sucked into the casing through the intake port and discharged to the outside of the casing through the exhaust port, and a fan motor that provides a driving force for rotation of the blower fan ; A filler in which the air sucked into the casing through the intake port is exchanged with the cooling water supplied from the water supply unit; A water collecting unit collecting coolant heat-exchanged with air in the filler material; And a silencer for reducing noise generated while air is discharged through the exhaust port. Includes.

Description

Noise reduction cooling tower {NOISE REDUCTION COOLING TOWER}

The present invention relates to a noise reduction cooling tower.

The cooling tower serves to cool cooling water by contacting air with cooling water, for example, cooling water used for condensing a refrigerant flowing through an air conditioner or refrigerator, that is, a refrigeration cycle. Such a cooling tower injects cooling water into the air in order to heat-exchange the high temperature cooling water, or makes the flowing cooling water contact with the air blown. Such a cooling tower includes a filler, a cooling water supply device for supplying cooling water to the filler, and a blowing device for flowing air to contact the cooling water flowing along the surface of the filler.

In recent years, as interest in environmental issues has increased, civil complaints are frequently generated due to noise generated during the operation of the cooling tower. In particular, noise mainly occurs in the process of discharging air to the outside through the exhaust port of the cooling tower.

To solve this problem, a cooling tower using a silencer has been proposed. However, the noise reduction cooling tower according to the prior art is merely a degree of reducing noise generated in the process of discharging air through the exhaust port by simply installing a silencer on the exhaust port, and does not take into account the characteristics of the cooling tower. Particularly, in the prior art, the position of the intake port and the exhaust port through which air is discharged to the inside and outside of the cooling tower, or the characteristics of the airflow discharged to the outside of the cooling tower through the exhaust port are not considered, so that efficient noise reduction cannot be achieved.

Korean Patent Registration No. 0681314 (Name: Cooling tower with noise reduction casing) Korean Registered Patent No. 1340172 (Name: Cooling Tower)

The present invention is to solve the problems caused by the prior art as described above, and an object of the present invention is to provide a noise reduction cooling tower configured to more efficiently reduce noise.

An aspect of a noise reduction cooling tower according to an embodiment of the present invention for achieving the above object includes a casing in which an intake port through which air is sucked is formed on at least one side and an exhaust port through which air is discharged is formed on an upper surface; A water supply unit supplying cooling water that is heat-exchanged with air sucked through the intake port; A blower comprising a blower fan configured to form a flow of air sucked into the casing through the intake port and discharged to the outside of the casing through the exhaust port, and a fan motor that provides a driving force for rotation of the blower fan ; A filler in which the air sucked into the casing through the intake port is exchanged with cooling water supplied from the water supply unit; A water collecting unit for collecting coolant heat-exchanged with air in the filler material; And a silencer for reducing noise generated while air is discharged through the exhaust port. Including, the silencer is provided on the upper surface of the casing, the housing in which a flow path through which the air discharged through the exhaust port flows is defined therein; And a plurality of sound absorbing members installed inside the flow path and absorbing noise generated while air flows through the flow path. Includes.

In one aspect of the embodiment of the present invention, the flow path includes: a first flow path extending in a vertical direction and communicating the exhaust port and a lower end thereof; And two second passages branched upwardly inclined in a direction opposite to each other at an upper end of the first passage. Includes.

In one aspect of the embodiment of the present invention, the cross-sectional area in the horizontal direction of the first passage is gradually increased in the vertical direction, and the minimum cross-sectional area in the horizontal direction of the first passage is the cross-sectional area in the horizontal direction of the exhaust port Above, the maximum cross-sectional area in the horizontal direction of the first passage is equal to or less than the sum of the cross-sectional areas in the horizontal direction of the second passage.

In one aspect of the embodiment of the present invention, the housing includes: an outer housing including two outer guides extending upwardly inclined at an angle opposite to each other; And an inner housing including two inner guides each extending at the same angle as the outer guide. And a portion of the interior of the housing is defined as the first and second flow paths by the outer housing and the inner housing.

In one aspect of the embodiment of the present invention, an extension guide further extending downwardly than the lower end of the inner guide is provided at a lower end of the outer guide, and a part of the interior of the housing is provided with the first flow path by the extension guide. The outer guide and the inner guide define another part of the housing as the second flow path.

In one aspect of the embodiment of the present invention, the blowing fan includes a hub, a plurality of blades radially arranged to be spaced apart from each other by a predetermined central angle around the hub, and a plurality of connection rods connecting the blades to the hub. Including, the hub is located inside a projection in a vertical direction of the inner housing, at least a part of the blade is outside of the projection in the vertical direction of the inner housing (射影) Is located in

In one aspect of the embodiment of the present invention, upper ends of the outer guide and the inner guide extend in a vertical direction to guide air discharged to the outside of the second passage in a vertical direction.

In one aspect of the embodiment of the present invention, the sound-absorbing member is disposed elongated in the vertical direction so as to be spaced apart from each other in the horizontal direction inside the second passage.

In one aspect of the present invention, the sound-absorbing member is formed in a polyhedral shape having a cross-section corresponding to a cross-section in a vertical direction of the second passage and a predetermined thickness, and the lower end of the sound-absorbing member is Compared to the rest, its thickness gradually decreases downward.

In one aspect of the embodiment of the present invention, the sound-absorbing member is formed in a polyhedral shape having a predetermined thickness and a cross-section corresponding to a cross-section in a vertical direction of the second passage, and the upper end of the sound-absorbing member is Compared to the rest, its thickness gradually decreases toward the top.

Another aspect of an embodiment of the present invention is a casing through which air is introduced into and out of the inlet port and the outlet port; A water supply unit supplying cooling water that is heat-exchanged with air sucked through the intake port; A blowing fan for forming a flow of air that is sucked into the casing through the intake port and discharged to the outside of the casing through the exhaust port; A filler in which the air sucked into the casing through the intake port is exchanged with cooling water supplied from the water supply unit; And a water collecting part for collecting coolant heat-exchanged with air in the filler, further comprising: a silencer for reducing noise generated in the process of discharging air through the exhaust port, wherein the silencer includes: A flow path including a first flow path in which the exhaust port and its lower end communicate with each other and extend in a vertical direction, and two second flow paths in which the upper end and the lower end of the first flow channel communicate with each other and extend obliquely upward in a direction opposite to each other Is formed, and a plurality of sound absorbing members for absorbing noise generated while air flows through the second flow path are vertically disposed so as to be spaced apart from each other in a horizontal direction.

In another aspect of the embodiment of the present invention, the cross-sectional area in the horizontal direction of the first passage is gradually increased in the vertical direction, and the minimum cross-sectional area in the horizontal direction of the first passage is the cross-sectional area in the horizontal direction of the exhaust port Above, the maximum cross-sectional area in the horizontal direction of the first passage is equal to or less than the sum of the cross-sectional areas in the horizontal direction of the second passage.

In another aspect of the embodiment of the present invention, the blowing fan includes a hub, a plurality of blades radially disposed to be spaced apart from each other by a predetermined central angle around the hub, and a plurality of connection rods connecting the blades to the hub. And at least a portion of the hub is located outside a projection in a vertical direction of the sound-absorbing member, and the blade is located inside the projection in a vertical direction of the sound-absorbing member.

In another aspect of the embodiment of the present invention, the lower end of the first passage and the upper end of the second passage extend in a vertical direction.

In another aspect of the embodiment of the present invention, the sound-absorbing member is formed in a polyhedral shape having a cross-section corresponding to a cross-section in a vertical direction of the second passage and a predetermined thickness, and upper and lower ends of the sound-absorbing member, the sound-absorbing Compared to the rest of the member, its thickness gradually decreases upward or downward.

In the noise reduction cooling tower according to an embodiment of the present invention, the noise is reduced while the air discharged through the exhaust port passes through the silencer. In particular, in an embodiment of the present invention, not only the flow path is branched inside the silencer in consideration of the flow of air by the blowing fan, but also the cross-sectional area of the flow path and the relative position of the blowing fan and the flow path are limited, and discharged through the silencer. A silencer is formed to prevent re-intake of air through the intake port. Therefore, according to the embodiment of the present invention, it is possible to expect an effect in which the noise of the cooling tower can be more efficiently reduced.

1 is a longitudinal sectional view showing a noise reduction cooling tower according to a first embodiment of the present invention.
2 is a partially cut-away perspective view showing a silencer constituting the first embodiment of the present invention.
3 is a longitudinal sectional view showing the flow of air and cooling water in the noise reduction cooling tower according to the first embodiment of the present invention.
4 is a longitudinal sectional view showing a noise reduction cooling tower according to a second embodiment of the present invention.

Hereinafter, a configuration of a silencer for a cooling tower according to a first embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a longitudinal sectional view showing a noise reduction cooling tower according to a first embodiment of the present invention, and FIG. 2 is a partially cutaway perspective view showing a silencer constituting a first embodiment of the present invention.

First, referring to FIG. 1, the cooling tower 1 according to this embodiment includes a casing 100, a water supply part 200, a blowing part 300, a filler 400, a water collecting part 500, and a silencer 1000. ). The casing 100 defines a predetermined space in which the constituent parts constituting the cooling tower 1 are installed. In addition, the water supply unit 200 serves to supply cooling water to be heat-exchanged. The blower 300 serves to flow air that is heat-exchanged with cooling water. The filler 400 is a place where heat exchange between the cooling water supplied by the water supply part 200 and the air flowing by the air blower 300 is performed, and the collecting part 500 is in the filler 400 This is where the heat-exchanged cooling water is collected. In addition, the silencer 1000 serves to reduce noise generated in the process of discharging the coolant and heat-exchanged air to the outside of the casing 100. In FIG. 1, the cooling tower 1 is shown as a cross flow type, but it will be natural that it can be applied to a counter flow type cooling tower.

More specifically, the casing 100 defines an external appearance and is formed in a predetermined shape including at least both side surfaces and an upper surface, for example, a hexahedral shape. An intake port 110 and an exhaust port 120 are formed in the casing 100. The intake port 110 is a place where air is sucked into the casing 100, and the exhaust port 120 is a place where air is discharged to the outside of the casing 100. In this embodiment, the intake port 110 is located on both sides of the casing 100, and the exhaust port 120 is located in the center of the upper surface of the casing 100. Of course, the intake port 110 may be formed only on one side of the casing 100.

In addition, a fan stack 130 is provided on the upper surface of the casing 100. The fan stack 130 serves to guide air discharged through the exhaust port 120. The fan stack 130 may be formed in a polyhedron, for example, a cylindrical shape, which extends upward by a predetermined length from the upper surface of the casing 100 and has its upper and lower surfaces open. Of course, the fan stack 130 is not separately provided and may be deleted.

The water supply unit 200 is disposed inside the casing 100, substantially above both sides of the casing 100, corresponding to an upper portion of the intake port 110. In this embodiment, the water supply unit 200 includes two water supply tanks 210. In the water supply tank 210, cooling water supplied by a water supply pipe (not shown) is stored, and the cooling water stored in the water supply tank 210 is the filler for heat exchange with air sucked through the intake port 110. It is sprayed downward toward (400).

Meanwhile, the blower 300 includes a blower fan 310 and a fan motor 320. The blowing fan 310 serves to flow air into and out of the casing 100. That is, when the blowing fan 310 rotates, air is sucked into the casing 100 through the intake port 110, and air that has been sucked through the intake port 110 and heat-exchanged with the cooling water is transferred to the exhaust port ( It is discharged to the outside of the casing 100 through 120. As the blowing fan 310, for example, an axial fan may be used. The fan motor 320 provides a driving force for rotation of the blowing fan 310.

More specifically, the blowing fan 310 includes a hub 311, a plurality of blades 313, and a plurality of connection rods 315. The hub 311 is formed in, for example, a substantially disk shape, and substantially includes a rotation shaft for receiving a driving force from the fan motor 320. In addition, the blades 313 are radially arranged to be spaced apart from each other by a predetermined central angle around the hub 311. Substantially, when the blowing fan 310 rotates, the air flows substantially upwardly inclined in a radial direction with respect to the blowing fan 310 by the blades 313. The connection rod 315 connects the blade 313 to the hub 311.

Next, the filler 400 is disposed inside the casing 100, at the centers of both sides of the casing 100, which are substantially below the water supply part 200. In addition, in the filler 400, the coolant sprayed from the water supply tank 210 flows along the surface or the space therebetween, and is in contact with the air sucked through the intake port 110 for heat exchange.

The water collecting part 500 collects coolant heat-exchanged with air sucked through the intake port 110 from the filler 400. The water collecting part 500 is disposed inside the casing 100 and substantially below both sides of the casing 100 corresponding to the lower side of the filling material 400.

On the other hand, the silencer 1000 is disposed above the casing 100, substantially above the exhaust port 120, on the upper surface of the casing 100. Referring to FIGS. 1 and 2, substantially, the silencer 1000 includes a housing 1100 and a plurality of sound absorbing members 1200.

In more detail, the housing 1100 is installed on the upper surface of the casing 100 and a flow path 1100P through which air discharged through the exhaust port 120 flows is defined therein. In this embodiment, the flow path 1100P includes a first flow path 1110P and two second flow paths 1120P.

The first flow path 1110P extends in a vertical direction so that the exhaust port 120 and its lower end communicate with each other. In addition, the second passage 1120P is branched upwardly inclined in a direction opposite to each other at the upper end of the first passage 1110P. Accordingly, substantially, it can be said that the first and second flow paths 1110P and 1120P are generally formed in a substantially'Y' shape.

In this embodiment, the cross-sectional area in the horizontal direction of the first flow path 1110P is gradually increased in the vertical direction. And the minimum cross-sectional area in the horizontal direction of the first passage 1110P is set to be equal to or greater than the cross-sectional area in the horizontal direction of the exhaust port 120, and the maximum cross-sectional area in the horizontal direction of the first passage 1110P is, It is set to be equal to or less than the sum of the cross-sectional areas in the horizontal direction of the second flow path 1120P. This is because the flow cross-sectional area of the flow path through which the air flows is decreased while the air discharged through the exhaust port 120 flows through the first and second flow paths 1110P and 1120P, thereby increasing the flow velocity of air. This is to prevent noise from increasing during the air flow process.

Meanwhile, the housing 1100 includes an outer housing 1110 and an inner housing 1120, and the outer housing 1110 and the inner housing 1120 substantially cover a part of the interior of the housing 1100. It is defined as the flow path 1100P. In this embodiment, the housing 1100 is formed in, for example, a hexahedral shape in which at least a portion of the upper and lower surfaces are open, and the outer housing 1110 and the inner housing 1120 are inside the housing 1100. It is provided so that a part of the inside of the housing 1100 may be defined as the flow path 1100P.

In addition, the outer housing 1110 includes two outer guides 1111 extending upwardly inclined at an angle opposite to each other, and the inner housing 1120 respectively extends at the same angle as the outer guide 1111. It includes two inner guides 1121.

In addition, at the lower end of the outer guide 1111, an extension guide 1113 extending downwardly compared to the lower end of the inner guide 1121 is provided. Accordingly, a part of the interior of the housing 1100 is defined as the first flow path 1110P by the extension guide 1113. In addition, another part of the housing 1100 is defined as the second flow path 1120P by the outer guide 1111 and the inner guide 1121. It is preferable that the lower end of the extension guide 113 is substantially in contact with the upper end of the fan stack 130.

Meanwhile, upper ends of the outer guide 1111 and the inner guide 1121 respectively extend in the vertical direction. Accordingly, air discharged to the outside of the second flow path 1120P may be guided in a vertical direction by upper ends of the outer guide 1111 and the inner guide 1121.

Particularly, in this embodiment, the hub 311 is located inside a projection in the vertical direction of the inner housing 1120. In addition, at least a part of the blade 313 is positioned outside the projection in the vertical direction of the inner housing 1120.

This is to allow air to flow evenly in a horizontal cross-sectional area of the flow path 1100P, in particular, the second flow path 1120P in consideration of the flow of air formed by the rotation of the blowing fan 310. In other words, substantially, since the air flow is formed to be inclined upward in the radial direction by the rotation of the blowing fan 310, in this embodiment, the hub 311 substantially irrelevant to the flow of air, the inner At least a part of the blade 313 which is located inside the projection in the vertical direction of the housing 1120 and forms the flow of air, is located outside the projection in the vertical direction of the inner housing 1120, The air flow formed by the rotation of the blowing fan 310 may be substantially formed in a direction corresponding to the second flow path 1120P.

Next, the sound-absorbing member 1200 serves to absorb noise generated while air flows through the flow path 1100P. To this end, the sound-absorbing member 1200 is disposed inside the flow path 1100P. In more detail, the sound-absorbing member 1200 is vertically disposed so as to be spaced apart from each other in the horizontal direction inside the second passage 1120P.

In this embodiment, the sound-absorbing member 1200 is formed in a polyhedral shape having a cross-section corresponding to a cross-section in the vertical direction of the second passage 1120P and a predetermined thickness. And the lower end of the sound-absorbing member 1200 is gradually reduced in thickness toward the bottom compared to the rest of the sound-absorbing member 1200, the upper end of the sound-absorbing member 1200, the rest of the sound-absorbing member 1200 Compared to that, the thickness gradually decreases toward the top.

The reduction in thickness at the lower and upper ends of the sound absorbing member 1200 is to guide the air introduced into the second passage 1120P or the air discharged to the outside of the second passage 1120P. . In other words, air that substantially flows through the second flow path 1120P by the lower end of the sound absorbing member 1200 is not interfered with by the lower end of the sound absorbing member 1200 and is directed to both sides of the sound absorbing member 1200. Can be guided to flow. In addition, the air discharged to the outside of the housing 1100 by flowing through the second flow path 1120P by the upper end of the sound absorbing member 1200 flows in a region corresponding to the directly above the sound absorbing member 1200 It can be guided to flow upward without generating eddy currents or the like due to the rapid expansion of the possible space.

On the other hand, in this embodiment, at least a part of the hub 311 is located outside the projection in the vertical direction of the sound absorbing member 1200. In addition, the blade 313 is located inside the projection in the vertical direction of the sound-absorbing member 1200. Therefore, the air flowing by the blowing fan 310 substantially evenly flows the sound-absorbing member 1200 in the horizontal direction, thereby preventing a phenomenon in which a part of the sound-absorbing member 1200 does not come into contact with the air. Can be.

Hereinafter, the operation of the noise reduction cooling tower according to the first embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

3 is a longitudinal sectional view showing the flow of air and cooling water in the noise reduction cooling tower according to the first embodiment of the present invention.

Referring to FIG. 3, first, when the blowing fan 310 is rotated by the fan motor 320, air sucked into the casing 100 through the intake port 110 passes through the filler 400. In addition, the air sucked through the intake port 110 is heat-exchanged with the cooling water supplied from the water supply unit 200 and substantially the water supply water supply tank 210 while passing through the filler 400.

In addition, the air exchanged with the coolant in the filler 400 by the continuous rotation of the blowing fan 310 is discharged to the outside of the casing 100 through the exhaust port 120. At this time, in this embodiment, noise is reduced as the air discharged through the exhaust port 120 passes through the silencer 1000.

In more detail, the air discharged through the exhaust port 120 is guided by the fan stack 130 and transferred to the flow path 1100P and substantially the first flow path 1110P. In addition, the air flowing through the first passage 1110P is discharged to the outside after flowing through the second passage 1120P. In this embodiment, noise is reduced by the sound-absorbing member 1200 while air flows through the second flow path 1120P.

In particular, in the present embodiment, the second flow path 1120P extends inclined upward at a predetermined angle in consideration of the flow of air flowing by the blowing fan 310. In addition, in this embodiment, in consideration of the flow of air by the blowing fan 310, the relative position of the blowing fan 310 with respect to the inner housing 1120, substantially, the second flow path 1120P, and A relative position with respect to the sound absorbing member 1200 is set. Accordingly, according to the present embodiment, efficient noise reduction due to the flow of air by the blowing fan 310, in particular, noise reduction using all of the sound absorbing member 1200 can be achieved.

Hereinafter, a noise reduction cooling tower according to a second embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

4 is a longitudinal sectional view showing a noise reduction cooling tower according to a second embodiment of the present invention. Among the components of this embodiment, the same components as those of the first embodiment of the present invention described above will be described in more detail with reference to reference numerals in FIGS. 1 to 3.

4, in the cooling tower 2 according to this embodiment, the fan stack 130 is deleted. That is, with the silencer 1000 disposed on the upper surface of the casing 100, the lower end of the outer guide 1111 constituting the outer housing 1110 is seated on the upper surface of the casing 100. Substantially, the lower end of the extension guide 1113 will be seated on the upper surface of the casing 100.

Within the scope of the basic technical idea of the present invention, many other modifications are possible for those of ordinary skill in the art, as well as the scope of the present invention should be interpreted based on the appended claims. .

100: casing 110: intake port
120: exhaust port 130: fan stack
200: water supply unit 300: blowing unit
400: filler 500: collection tank
1000: silencer 1100: housing
1110: outer housing 1111: outer guide
1113: extension guide 1120: inner housing
1121: inner guide 1100P: Euro
1110P: 1st euro 1120P: 2nd euro
1200: sound-absorbing member

Claims (15)

A casing 100 in which an intake port 110 through which air is sucked is formed on at least one side, and an exhaust port 120 through which air is discharged is formed on an upper surface;
A water supply unit 200 for supplying cooling water that is heat-exchanged with air sucked through the inlet 110;
The blowing fan 310 and the blowing fan are sucked into the casing 100 through the intake port 110 and form a flow of air discharged to the outside of the casing 100 through the exhaust port 120 A blower 300 including a fan motor 320 providing a driving force for rotation of 310;
A filler 400 in which air sucked into the casing 100 through the intake port 110 is exchanged with the cooling water supplied from the water supply unit 200;
A water collecting part 500 for collecting coolant heat-exchanged with air in the filler 400; And
A silencer 1000 for reducing noise generated in the process of discharging air through the exhaust port 120; Including,
The silencer 1000,
A housing (1100) installed on the upper surface of the casing (100) and defining a flow path (1100P) through which air discharged through the exhaust port (120) flows; And
A plurality of sound-absorbing members 1200 installed inside the flow path 1100P and absorbing noise generated while air flows through the flow path 1100P; Including,
The flow path 1100P,
A first flow path 1110P extending in a vertical direction and communicating the exhaust port 120 and a lower end thereof; And
Two second passages 1120P branched upwardly inclined in a direction opposite to each other at the upper end of the first passage 1110P; Including,
The housing 1100,
An outer housing 1110 including two outer guides 1111 extending upwardly at an angle opposite to each other; And
An inner housing 1120 including two inner guides 1121 each extending at the same angle as the outer guide 1111; Including,
A noise reduction cooling tower in which a portion of the interior of the housing 1100 is defined as the first and second flow paths 1110P and 1120P by the outer housing 1110 and the inner housing 1120.
delete The method of claim 1,
The cross-sectional area in the horizontal direction of the first passage 1110P is gradually increased in the vertical direction,
The minimum cross-sectional area in the horizontal direction of the first passage 1110P is equal to or greater than the cross-sectional area in the horizontal direction of the exhaust port 120,
The maximum cross-sectional area of the first passage 1110P in the horizontal direction is less than or equal to the sum of the cross-sectional areas of the second passage 1120P in the horizontal direction.
delete The method of claim 1,
At the lower end of the outer guide 1111, an extension guide 1113 extending further downward than the lower end of the inner guide 1121 is provided,
A part of the inside of the housing 1100 is defined as the first flow path 1110P by the extension guide 1113,
A noise reduction cooling tower in which another part of the housing is defined as the second flow path 1120P by the outer guide 1111 and the inner guide 1121.
The method of claim 1,
The blowing fan 310 includes a hub 311, a plurality of blades 313 radially disposed to be spaced apart from each other by a predetermined central angle about the hub 311, and the blade 313 to the hub 311 Including a plurality of connection rods 315 to connect to,
The hub 311 is located inside the projection in the vertical direction of the inner housing 1120,
At least a portion of the blades 313 is a noise reduction cooling tower that is located outside a projection in a vertical direction of the inner housing 1120.
The method of claim 1,
The upper end portions of the outer guide 1111 and the inner guide 1121 respectively extend in a vertical direction to guide air discharged to the outside of the second passage 1120P in a vertical direction.
The method of claim 3,
The sound-absorbing member 1200 is a noise reduction cooling tower that is elongated in a vertical direction so as to be spaced apart from each other in a horizontal direction inside the second passage 1120P.
The method of claim 8,
The sound-absorbing member 1200 is formed in a polyhedral shape having a cross-section corresponding to the cross-section in the vertical direction of the second passage 1120P and a predetermined thickness,
The lower end of the sound-absorbing member 1200 is a noise reduction cooling tower whose thickness is gradually reduced toward a downward direction compared to the rest of the sound-absorbing member 1200.
The method of claim 8,
The sound-absorbing member 1200 is formed in a polyhedral shape having a cross-section corresponding to the cross-section in the vertical direction of the second passage 1120P and a predetermined thickness,
The upper end of the sound-absorbing member 1200 is a noise reduction cooling tower whose thickness is gradually reduced toward the upper side compared to the rest of the sound-absorbing member 1200.
delete delete delete delete delete

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