JP6935469B2 - Noise reduction device and noise reduction system - Google Patents

Description

An embodiment of the present invention relates to a noise reduction device and a noise reduction system that reduce noise transmitted outside the site of a facility where a heat source unit is installed.

With the development of the information-oriented society, there are an increasing number of cases where so-called data centers, which are facilities that process a large amount of data with computers such as servers, are constructed adjacent to residential areas. Many data center computers operate continuously day and night.

Japanese Patent No. 6082004

A heat source unit for an air conditioner that processes the exhaust heat of a computer is installed on the roof of the data center building, and the operating noise of this heat source unit is transmitted as noise outside the premises of the data center.

An object of the embodiment of the present invention is to provide a noise reduction device and a noise reduction system that reduce the sound transmitted outside the site of the facility where the heat source machine is installed.

The noise reduction device of the present embodiment includes a plurality of louvers that adjust the air volume according to a change in opening degree, and has a soundproof wall surrounding the heat source machine; the sound transmitted outside the site of the facility where the heat source machine is installed is a noise regulation value. It is provided with a control means for controlling the opening degree of each louver within a range within the range of; The control means is such that the sound of the plurality of noise monitoring points outside the soundproof wall falls within the noise limit values set for each noise monitoring point based on the noise regulation value. The opening degree of each louver is controlled so that the air flow rate of the louver is maximized.

The figure which looked at the structure of one Embodiment and the peripheral part thereof from above. The perspective view of each heat source machine in FIG. The figure which shows the structure of the soundproof wall on the front side in FIG. The cross section along the AA'line in FIG. 3 is seen in the direction of the arrow. The figure which shows the state in which each louver of FIG. 4 is rotated. The figure which shows the structure of the soundproof wall on the left side surface side in FIG. The figure which shows the structure of the soundproof wall on the back side in FIG. The figure which shows the structure of the soundproof wall on the right side surface side in FIG. The flowchart which shows the control of the controller in one Embodiment. A time chart showing a part of the control of the controller in one embodiment.

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a state in which the data center building and its surroundings according to the embodiment are viewed from above.

The rectangular site 1 is adjacent to an adjacent residential area via the site boundary lines 2a, 2b, 2c, and 2d. On this site 1, a facility called a data center building 3 that processes a large amount of data with a computer such as a server is built. Most computers in data centers operate continuously day and night.

For the facilities of this data center, a noise regulation value N for regulating the sound transmitted to the outside of the site 1 (outside the site boundary lines 2a, 2b, 2c, 2d) is set by an administrative agency or the like. The noise regulation value N includes a noise regulation value N1 in the night time zone, a noise regulation value N2 (> N1) in the morning and evening time zone, and a noise regulation value N3 (> N2) in the daytime time zone. The strictest is the noise regulation value N1 in the night time zone, for example, about 40 to 45 dB is selected.

Building 3 is a reinforced concrete building with floors on multiple floors where a computer room, office, etc. are arranged. A rectangular flat surface (called a rooftop plane) 4 is provided on the rooftop at the top, and the flat surface 4 is provided. Adjacent to it is a machine room (called a rooftop machine room) 5. The height position of the roof of the rooftop machine room is higher than the height position of the plane 4. On the rooftop plane 4, a plurality of heat source machines 10 enlarged in FIG. 2 are arranged vertically and horizontally and in a rectangular shape. The heat source machine 10 is a pair of outdoor heat exchangers 11 facing each other in a V shape, and a fan that sucks in outside air through these outdoor heat exchangers 11 and discharges the sucked air upward from between the two outdoor heat exchangers 11. 12 is provided, and a heat pump type air conditioner is configured together with a large number of indoor units installed in the building 3.

On the rooftop plane 4, soundproof walls 21a, 21b, 21c, 21d having a height sufficient to exceed the total height of the heat source machine 10 are arranged in a standing state and in a rectangular shape at positions surrounding all the heat source machines 10 from the front, back, left and right. They are arranged in a sequentially connected state. The soundproof wall (first soundproof wall) 21a exists between the front of the building 3 and the site boundary line 2a, and the soundproof wall (second soundproof wall) 21b is between the left side surface of the building 3 and the site boundary line 2b. The soundproof wall (third soundproof wall) 21c exists between the back surface of the building 3 and the site boundary line 2c, and the soundproof wall (fourth soundproof wall) 21d is the right side of the building 3 and the site boundary line 2d. It exists between.

A plurality of watering nozzles (watering means) in the inner space of the soundproof walls 21a, 21b, 21c, 21d, at a position higher than the total height of all the heat source machines 10 and at a position lower than the total height of the soundproof walls 21a, 21b, 21c, 21d. ) 31, 32, 33, 34, 35, 36 are distributed. These watering nozzles 31 to 36 are connected to the tank 43 via the water pipe 41 and the pump 42 provided in the water pipe 41, and the water supplied from the tank 43 is converted into a mist by the operation of the pump 42 into each heat source machine 10. Spray. The tank 43 is connected to a water source via a water pipe 44.

As a member for supporting the watering nozzles 31 to 36 above each heat source machine 10, for example, an anti-diffraction sound deadening plate (not shown) arranged in a grid pattern between the upper parts of the soundproof walls 21a, 21b, 21c, 21d. ) Is used.

Inside the soundproof walls 21a, 21b, 21c, 21d, an air temperature sensor (for example, a dry-bulb thermometer) 51 is arranged in the space between each heat source machine 10 and the soundproof wall 21a, and each heat source machine 10 and the soundproof wall 21b. An air temperature sensor 52 is arranged in the space between the heat source machine 10 and the air temperature sensor 53 is arranged in the space between each heat source machine 10 and the soundproof wall 21c, and the air temperature sensor 53 is arranged in the space between each heat source machine 10 and the soundproof wall 21d. An air temperature sensor 54 is arranged.

The air temperature sensor 51 detects the air temperature (outside air temperature) Ta between each heat source machine 10 and the soundproof wall 21a. The air temperature sensor 52 detects the air temperature Tb between each heat source machine 10 and the soundproof wall 21b. The air temperature sensor 53 detects the air temperature Tc between each heat source machine 10 and the soundproof wall 21c. The air temperature sensor 54 detects the air temperature Td between each heat source machine 10 and the soundproof wall 21d.

A predetermined position on the roof surface 4 outside the soundproof wall 21a, for example, a position on the peripheral edge of the roof surface 4 on the side corresponding to the soundproof wall 21a and facing substantially the middle portion of the horizontal length of the soundproof wall 21a. The first noise monitoring point is set in. A noise sensor 61 is arranged at the first noise monitoring point.

A predetermined position on the roof surface 4 outside the soundproof wall 21b, for example, a position on the peripheral edge of the roof surface 4 on the side corresponding to the soundproof wall 21b and facing approximately the middle portion of the horizontal length of the soundproof wall 21b. The second noise monitoring point is set in. A noise sensor 62 is arranged at the second noise monitoring point.

At a predetermined position outside the soundproof wall 21c on the roof flat surface 4, for example, at the edge of the roof of the rooftop machine room 5 on the side corresponding to the soundproof wall 21c and at a position facing approximately the middle portion of the horizontal length of the soundproof wall 21c. , The third noise monitoring point is set. A noise sensor 63 is arranged at the third noise monitoring point.

A predetermined position on the roof surface 4 outside the soundproof wall 21d, for example, a position on the peripheral edge of the roof surface 4 on the side corresponding to the soundproof wall 21d and facing approximately the middle portion of the horizontal length of the soundproof wall 21d. The fourth noise monitoring point is set in. A noise sensor 64 is arranged at the fourth noise monitoring point.

The noise sensor 61 detects the sound (noise) emitted from each heat source machine 10 that passes over or passes through the soundproof wall 21a and propagates in the direction of the site boundary line 2a. The noise sensor 62 detects, among the operating sounds of each heat source machine 10, the sound that passes over or passes through the soundproof wall 21b and propagates in the direction of the site boundary line 2b. The noise sensor 63 detects the operating noise of each heat source machine 10 that propagates in the direction of the site boundary line 2c beyond the soundproof wall 21c and further beyond the roof of the rooftop machine room 5. The noise sensor 64 detects, among the operating sounds of each heat source machine 10, the sound that passes over or passes through the soundproof wall 21d and propagates in the direction of the site boundary line 2d.

The detection temperature data of the air temperature sensors 51 to 54 and the detection sound data of the noise sensors 61 to 64 are notified to the controller 70 which is a control means. A drive unit 71 for driving the air flow amount adjusting mechanisms 100, 120, 140, 160 described later on the soundproof walls 21a to 21d is connected to the controller 70. The controller 70 and the drive unit 71 are arranged at a predetermined location on the rooftop floor surface 4 or at a predetermined location in the rooftop machine room 5 while being housed in the control box.

The appearance of the soundproof wall 21a is shown in FIG. 3, and the cross section along the AA'line of FIG. 3 is shown in FIG. The basic skeleton is a pillar portion 82, 83 arranged vertically at both ends of the base portion 81, a beam member 84 hung between the middle portions of the pillar portion 82, 83, and the like. Prepare as. The soundproof wall 21a stands in a space surrounded by a plurality of support members 85 arranged in an upright position from a plurality of positions of the beam member 84, these support members 85, the beam member 84, and the pillar portions 82, 83. A plurality of sound deadening plates 86 arranged in a positioned state to form an upper edge portion of the soundproof wall 21a, and a rectangle surrounded by a beam portion 84, a pillar portion 82, 83, and a base portion 81 on the lower side of the sound deadening plate 86. A plurality of (for example, eight) louvers (first louvers) 101 rotatably arranged in the space (opening) of the shape along the vertical direction, a motor 102 built in the pillar 82, and the power of the motor 102. A rotating mechanism 103 that rotates each louver 101 in response to the response, a plurality of solar power generation panels P attached to the outer surface of each of the sound deadening plates 86, and the like are provided.

The opening Qa of each louver 101 continuously changes from 0% of fully closed to 100% of fully open according to the rotation position, and the ventilation amount in the soundproof wall 21a is in the range of 0 to 100% due to this change in opening. Adjust with. Each louver 101, a motor 102, and a rotating mechanism 103 constitute a ventilation amount adjusting mechanism 100 for the soundproof wall 21a.

As shown in FIGS. 3 and 4, when the louvers 101 are lined up in a vertical direction and are in contact with each other, the opening Qa is 0% in a fully closed state, and the air volume of the soundproof wall 21a at this time is It is 0%. As shown in FIG. 5, the opening Qa when each louver 101 is rotated at an angle of about 45 degrees is 50% of the full opening, and the ventilation amount of the soundproof wall 21a at this time is almost half of the maximum. 50%. When the opening Qa of each louver 101 is fully closed, the operating noise of each heat source machine 10 passes through the soundproof wall 21a without passing between the louvers 101, and the noise sensor 61 of the first noise monitoring point and It is transmitted to the site boundary line 2a side. When each louver 101 on the soundproof wall 21a is opened even a little, the operating sound of each heat source machine 10 passes through the gap between the louvers 101 and exceeds the soundproof wall 21a to the noise sensor of the first noise monitoring point. It is transmitted to 61 and the site boundary line 2a side.

As shown in FIG. 6, the soundproof wall 21b has a base portion 111 arranged along the lateral direction of the arrangement of the heat source machines 10 and standing vertically at both ends of the base portion 111. The arranged pillar portions 112 and 113, the beam member 114 spanned between the pillar portions 112 and 113 in the middle portion, and the like are provided as a basic skeleton. The soundproof wall 21b is in a standing state in a space surrounded by a support member 115 arranged in an upright position from the middle of the beam member 114, the support member 115, the beam member 114, and the column portions 112, 113. A plurality of sound deadening plates 116 arranged with the above to form the upper edge portion of the soundproof wall 21b, and a rectangular shape surrounded by beam portions 114, pillar portions 112, 113, and base portions 111 on the lower side of the sound deadening plates 116. A plurality of (for example, eight) louvers (second louvers) 121 rotatably arranged in a space (opening) in the vertical direction, a motor 122 built in a pillar 112, and the power of the motor 122 are received. A rotating mechanism 123 that rotates each louver 121, a plurality of solar power generation panels P attached to the outer surface of each of the sound deadening plates 116, and the like are provided.

The opening Qb of each louver 121 continuously changes from 0% of fully closed to 100% of fully open according to the rotation position, and the ventilation amount in the soundproof wall 21b is in the range of 0 to 100% due to this change in opening. Adjust with. Each louver 121, a motor 122, and a rotating mechanism 123 constitute a ventilation amount adjusting mechanism 120 for the soundproof wall 21b.

As shown in FIG. 6, when the louvers 121 are lined up in a vertical direction and are in contact with each other, the opening Qb is 0% in a fully closed state, and the ventilation amount of the soundproof wall 21b at this time is 0%. be. The opening Qb when each louver 121 is rotated at an angle of about 45 degrees is 50%, which is about half of the fully open state, and the airflow amount of the soundproof wall 21b at this time is 50%, which is about half of the maximum. When the opening degree Qb of each louver 121 is fully closed, the operating noise of each heat source machine 10 does not pass between the louvers 121 and crosses the soundproof wall 21b, and the noise sensor 62 of the second noise monitoring point and the noise sensor 62 It is transmitted to the site boundary line 2b side. When each louver 121 on the soundproof wall 21b is open even a little, the operating noise of each heat source machine 10 passes through the gap between the louvers 121 and exceeds the soundproof wall 21b to the noise sensor of the second noise monitoring point. It is transmitted to 62 and the site boundary line 2b side.

As shown in the appearance in FIG. 7, the soundproof wall 21c is arranged in a standing position vertically at both ends of the base portion 131 arranged along the longitudinal direction of the arrangement of each heat source machine 10 and both ends of the base portion 131. As a basic skeleton, the pillars 132 and 133, and the beam members 134 spanned between the pillars 132 and 133 in the middle of the pillars 132 and 133 are provided. The soundproof wall 21c is in a standing state in a space surrounded by a support member 135 arranged in an upward standing state from a plurality of positions of the beam member 134, the support member 135, the beam member 134, and the column portions 132, 133. A plurality of sound deadening plates 136 arranged with the above to form the upper edge portion of the soundproof wall 21c, and a rectangular shape surrounded by a beam portion 134, a pillar portion 132, 133, and a base portion 131 on the lower side of the sound deadening plate 136. A plurality of (for example, eight) louvers (third louvers) 141 rotatably arranged in a space (opening) in the vertical direction, a motor 142 built in a pillar 132, and the power of the motor 142 are received. It is provided with a rotation mechanism 143 that rotates each louver 141, a plurality of solar power generation panels P attached to the outer surface of each of the sound deadening plates 136, and the like.

The opening Qc of each louver 141 continuously changes from 0% of fully closed to 100% of fully open according to the rotation position, and the ventilation amount in the soundproof wall 21c is in the range of 0 to 100% due to this change in opening. Adjust with. Each louver 141, a motor 142, and a rotating mechanism 143 constitute a ventilation amount adjusting mechanism 140 for the soundproof wall 21c.

As shown in FIG. 7, when the louvers 141 are lined up in a vertical direction and are in contact with each other, the opening Qc is 0% in a fully closed state, and the ventilation amount of the soundproof wall 21c at this time is 0%. be. When each louver 141 is rotated at an angle of about 45 degrees, the opening Qc is 50%, which is about half of the fully open state, and the air volume of the soundproof wall 21c at this time is 50%, which is about half of the maximum. When the opening Qc of each louver 141 is fully closed, the operating noise of each heat source machine 10 passes through the soundproof wall 21c without passing between the louvers 141 and the third noise monitoring point (noise sensor 63). And it is transmitted to the site boundary line 2c side. If each louver 141 on the soundproof wall 21c is open even a little, the operating noise of each heat source unit 10 passes through the gap between the louvers 141 and exceeds the soundproof wall 21c to the noise sensor at the third noise monitoring point. It is transmitted to 63 and the site boundary line 2c side.

As shown in the appearance of the soundproof wall 21d, the base portion 151 is arranged along the lateral direction of the arrangement of the heat source machines 10, and the soundproof wall 21d is standing vertically at both ends of the base portion 151. The arranged pillar portions 152, 153 and the beam member 154 spanned between the pillar portions 152, 153 in the middle thereof are provided as a basic skeleton. The soundproof wall 21d is placed in a standing state in a space surrounded by a support member 155, which is arranged in a standing state upward from the middle portion of the beam member 154, the support member 155, the beam member 154, and the pillar portions 152, 153. A plurality of sound deadening plates 156 arranged with the above to form the upper edge of the soundproof wall 21d, and a rectangular shape surrounded by beam portions 154, pillar portions 152, 153, and base portions 151 on the lower side of these sound deadening plates 156. A plurality of (for example, eight) louvers (fourth louvers) 161 rotatably arranged in a space (opening) in the vertical direction, a motor 162 built in a pillar portion 152, and the power of the motor 162 are received. A rotating mechanism 163 that rotates each louver 161 and a plurality of solar power generation panels P attached to the outer surface of each of the sound deadening plates 156 are provided.

The opening Qd of each louver 161 continuously changes from 0% fully closed to 100% fully open according to the rotation position, and the change in opening causes the ventilation amount in the soundproof wall 21d to be in the range of 0 to 100%. Adjust with. Each louver 161, a motor 162, and a rotating mechanism 163 constitute a ventilation amount adjusting mechanism 160 for the soundproof wall 21d.

As shown in FIG. 8, when the louvers 161 are lined up in a vertical direction and are in contact with each other, the opening Qd is 0% in a fully closed state, and the ventilation amount of the soundproof wall 21d at this time is 0%. be. The opening Qd when each louver 161 is rotated at an angle of about 45 degrees is 50%, which is about half of the fully open state, and the airflow amount of the soundproof wall 21d at this time is 50%, which is about half of the maximum. When the opening degree Qd of each louver 161 is fully closed, the operating noise of each heat source machine 10 does not pass between the louvers 161 and goes over the soundproof wall 21d to the noise sensor 64 and the noise sensor 64 of the fourth noise monitoring point. It is transmitted to the site boundary line 2d side. When each louver 161 on the soundproof wall 21d is open even a little, the operating noise of each heat source machine 10 passes through the gap between the louvers 161 and exceeds the soundproof wall 21d to the noise sensor at the fourth noise monitoring point. It is transmitted to 64 and the site boundary line 2d side.

The generated power of each of the photovoltaic power generation panels P can be used as operating power for various devices existing in the rooftop plane 4 and the rooftop machine room 5, such as the pump 42, the controller 70, and the drive unit 71.

The controller 70 stores the noise regulation values N (noise regulation values N1, N2, N3) in the internal memory, and the sound transmitted from each heat source machine 10 to the outside of the site 1 is within the noise regulation value N. The opening degrees Qa, Qb, Qc, and Qd of each louver 101, 121, 141, 161 are controlled so as to maximize the air flow rate of the soundproof walls 21a to 21d. Includes 70a-70c.

In the internal memory of the controller 70, in addition to the noise regulation value N, "the shortest distance between the first to fourth noise monitoring points and the site boundary lines 2a to 2d La, Lb, Lc, Ld". "Presence / absence and height dimensions of buildings existing between the 1st to 4th noise monitoring points and site boundary lines 2a to 2d" "Height dimensions of roof plane 4" "Height dimensions of roof of roof machine room 5" ] Etc. are stored in advance as weighted data when converting the noise regulation value N into the noise limit values Nas, Nbs, Ncs, Nds at the first to fourth noise monitoring points (positions of the noise sensors 61 to 64). ing. This weighted data can be appropriately updated by, for example, a staff member connecting an information terminal to the controller 70 and performing data input work.

When one or more of the heat source machines 10 are turned on, the control section 70a sets the noise regulation value N at the first to fourth noise monitoring points (positions of the noise sensors 61 to 64) by the calculation using the weighted data. Noise limit values (1st to 4th noise limit values) are converted into Nas, Nbs, Ncs, and Nds.

The noise limit value Nas includes a noise limit value Na2 in the night time zone, a noise limit value Na2 (> Na1) in the morning and evening time zone, and a noise limit value Na3 (> Na2) in the daytime time zone. Similarly, the noise limit values Nbs, Ncs, and Nds are the noise limit values Nb1, Nc1, Nd1 in the night time zone, the noise limit values Nb2, Nc2, Nd2 in the morning and evening time zone, and the noise limit values Nb3, Nc3 in the daytime time zone. Each includes Nd3.

The control section 70b is provided with each louver 101 so that the ventilation amount of the soundproof wall 21a is maximized within the range where the detected sound level Na of the noise sensor 61 at the first noise monitoring point falls within the noise limit value Nas (Na1, Na2, Na3). The opening degree Qa of is controlled. Similarly, the control section 70b has a soundproof wall 21b within a range in which the detection sound levels Nb, Nc, and Nd of the noise sensors 62, 63, and 64 at the second to fourth noise monitoring points fall within the noise limit values Nbs, Ncs, and Nds, respectively. The openings Qb, Qc, and Qd of the louvers 121, 141, and 161 are controlled so that the airflows of the louvers 121, 141, and 161 are maximized, respectively.

The control section 70c uses an internal clock to set the night time zone (for example, 22:00 to 6:00), the morning and evening time zone (for example, 6:00 to 8:00 and 19:00 to 22:00), and the daytime time zone (for example, 8:00 to 19:00). It monitors and continuously executes watering by watering nozzles 31 to 36 during the night time when noise regulation is the strictest, and intermittently (also intermittently) watering by watering nozzles 31 to 36 during the morning and evening hours when noise regulation is the next strictest. The watering by the watering nozzles 31 to 36 is stopped (off) during the daytime (for example, 9:00 to 16:00) when the noise regulation is relatively loose. In the morning and evening hours in the spring and autumn when the temperature does not rise so much or in the winter when the temperature drops significantly, a control for stopping (off) watering by the watering nozzles 31 to 36 may be adopted.

Specifically, during the night time, the control section 70c continuously sprinkles water from all the watering nozzles 31 to 36 regardless of the detection temperatures Ta, Tb, Tc, and Td of the air temperature sensors 51, 52, 53, and 54. To run.

In the morning and evening hours, when the detection temperature Ta of the air temperature sensor 51 inside the soundproof wall 21a is less than the set value Ts, the control section 70c is watered by the watering nozzles 31, 32, 33 on the soundproof wall 21a side for cooling assistance. Is intermittently executed (or stopped), and when the detection temperature Ta is equal to or higher than the set value Ts, watering by the watering nozzles 31, 32, and 33 is continuously executed in order to prevent an abnormal temperature rise. Similarly, in the morning and evening hours, the control section 70c intermittently sprinkles water by the watering nozzles 31 and 34 on the soundproof wall 21b side when the detection temperature Tb of the air temperature sensor 52 inside the soundproof wall 21b is less than the set value Ts. When the detection temperature Tb is equal to or higher than the set value Ts, watering by the watering nozzles 31 and 34 is continuously executed based on the judgment that the cooling is insufficient. When the detection temperature Tc of the air temperature sensor 53 inside the soundproof wall 21c is less than the set value Ts, watering by the watering nozzles 34, 35, 36 on the soundproof wall 21c side is intermittently executed (or stopped), and the detection temperature Tc When is equal to or greater than the set value Ts, watering by the watering nozzles 34, 35, and 36 is continuously executed based on the judgment that the cooling is insufficient. When the detection temperature Td of the air temperature sensor 54 inside the soundproof wall 21d is less than the set value Ts, watering by the watering nozzles 33 and 36 on the soundproof wall 21d side is intermittently executed (or stopped), and the detection temperature Td is set. If the value is Ts or more, watering by the watering nozzles 33 and 36 is continuously executed based on the judgment that the cooling is insufficient.

In the daytime, the control section 70c stops watering by the watering nozzles 31, 32, 33 when the air temperature Ta inside the soundproof wall 21a is less than the set value Ts, and when the air temperature Ta is equal to or more than the set value Ts. Is continuously or intermittently executing watering by the watering nozzles 31, 32, 33 based on the judgment that the cooling is insufficient. Similarly, during the daytime, the control section 70c stops watering by the watering nozzles 31 and 34 when the air temperature Tb inside the soundproof wall 21b is less than the set value Ts, and the air temperature Ta is equal to or higher than the set value Ts. In this case, watering by the watering nozzles 31 and 34 is continuously or intermittently performed based on the judgment that the cooling is insufficient. When the air temperature Tc inside the soundproof wall 21c is less than the set value Ts, the watering nozzles 34, 35, 36 stop watering, and when the air temperature Tc is more than the set value Ts, it is judged that the cooling is insufficient. Watering with the watering nozzles 34, 35, 36 below is performed continuously or intermittently. When the air temperature Td inside the soundproof wall 21d is less than the set value Ts, the watering nozzles 33 and 36 stop watering, and when the air temperature Ta is equal to or more than the set value Ts, it is judged that the cooling is insufficient. Watering by the watering nozzles 33 and 36 is performed continuously or intermittently.

The soundproof walls 21a to 21d, watering nozzles 31 to 36, water pipes 41 and 44, pump 42, tank 43, air temperature sensors 51 to 54, noise sensors 61 to 64, controller 70, drive unit 71, air flow adjustment mechanism 100, The 120, 140, and 160 constitute a noise reduction device that reduces the noise transmitted from each heat source unit 10 to the outside of the site 1.

Next, the control executed by the controller 70 will be described with reference to the flowchart of FIG. 9 and the time chart of FIG. Steps S1, S2 ... In the flowchart of FIG. 9 are simply abbreviated as S1, S2 ... The time chart of FIG. 10 shows the temporal change of the control related to the soundproof wall 21a in the flowchart of FIG.

When the operation of at least one heat source unit of each heat source unit 10 is turned on (YES in S1), the controller 70 reads the noise regulation value N and the weighted data from the internal memory (S2), and also reads the read noise regulation value N. The noise limit value N is set to the noise limit value Nas (Na1, Nb2, Nc3) at the first noise monitoring point and the noise limit value Nbs (Nb1, Nb2, Nb2) at the second noise monitoring point by the calculation that corrects based on the weighted data. Nb3), the noise limit value Ncs (Nc1, Nc2, Nc3) at the third noise monitoring point, and the noise limit value Nds (Nd1, Nd2, Nd3) at the fourth noise monitoring point are converted and set (S3).

Then, the controller 70 monitors the arrival of the night time zone, the morning / evening time zone, and the daytime time zone by the internal clock (S4, S23).

[Morning and evening hours]
In the morning and evening time zone (YES in S4), the controller 70 has a ventilation amount of the soundproof wall 21a within a range in which the detection sound level Na of the noise sensor 61 at the first noise monitoring point falls within the noise limit value Na2 in the morning and evening time zone set above. The opening Qa of each louver 101 on the soundproof wall 21a is controlled so as to maximize (S5).

As the opening degree Qa of each louver 101 on the soundproof wall 21a is larger, the airflow amount of the soundproof wall 21a is increased, and the sound transmitted from each heat source machine 10 to the outside of the soundproof wall 21a is also increased. As the opening degree Qa of each louver 101 on the soundproof wall 21a is smaller, the airflow amount of the soundproof wall 21a is reduced, and the sound transmitted from each heat source machine 10 to the outside of the soundproof wall 21a is also reduced.

Therefore, specifically, the controller 70 reduces the opening Qa of each louver 101 in order to reduce the sound transmitted from each heat source machine 10 to the outside of the soundproof wall 21a, and the detection sound level Na is in the morning and evening hours. When the noise limit value is within Na2, the opening Qa (for example, 50%) at that time is maintained. This opening Qa is the largest in the range in which the detection sound level Na falls within the noise limit value Na2 in the morning and evening hours.

Similarly, the controller 70 has a range in which the detection sound levels Nb, Nc, and Nd of the noise sensors 62, 63, and 64 at the second, third, and fourth noise monitoring points fall within the noise limit values Nb2, Nc2, and Nd2 set above. The openings Qb, Qc, and Qd of the louvers 121, 141, 161 on the soundproof walls 21b, 21c, and 21d are controlled, respectively, so that the air flow rate of the soundproof walls 21b, 21c, and 21d is maximized (S6, S7, S8). ).

Specifically, the controller 70 reduces the opening degrees Qb, Qc, and Qd of the louvers 121, 141, 161 in order to reduce the sound transmitted from each heat source machine 10 to the outside of the soundproof walls 21b, 21c, 21d. When the detection sound levels Nb, Nc, Nd fall below the noise limit values Nb2, Nc2, Nd2, the opening degree Qb, Qc, Qd (for example, 50%) at that time is maintained. These openings Qb, Qc, and Qd are the largest in the range in which the detection sound levels Nb, Nc, and Nd are within the noise limit values Nb2, Nc2, and Nd2 in the morning and evening hours.

In this way, the maximum ventilation amount of the soundproof walls 21a to 21d is within the range in which the detection sound levels Na to Nd of the noise sensors 61 to 64 at the first to fourth noise monitoring points fall within the noise limit values Na2 to Nd2 in the morning and evening hours. By controlling the opening degrees Qa to Qd of the louvers 101 to 161 on the soundproof walls 21a to 21d, the ventilation amount (cooling capacity for each heat source machine 10) of the soundproof walls 21a to 21d is secured as much as possible. However, the sound transmitted from each heat source unit 10 to the outside of the site 1 can be surely suppressed to the noise regulation value N2 in the morning and evening hours.

Along with this opening degree control, the controller 70 compares the detected temperature Ta of the air temperature sensor 51 inside the soundproof wall 21a with the set value Ts (S9).
When the detection temperature Ta of the air temperature sensor 51 is less than the set value Ts (YES in S9), the controller 70 intermittently executes watering by the watering nozzles 31, 32, 33 on the soundproof wall 21a side (S10; watering). On, off). That is, mist-like water is intermittently discharged from the watering nozzles 31, 32, 33, and it falls on a plurality of heat source machines 10 mainly existing inside the soundproof wall 21a. As a result, even if the opening Qa of each louver 101 is controlled in the shrinking direction and the airflow amount of the soundproof wall 21a is reduced, the insufficient cooling of each heat source machine 10 existing inside the soundproof wall 21a can be compensated. The cooling capacity for each heat source machine 10 is a cooling amount due to ventilation of each louver 101 and a cooling amount due to intermittent sprinkling water.

However, when the detection temperature Ta of the air temperature sensor 51 rises above the set value Ts (NO in S9), the controller 70 continuously executes watering by the watering nozzles 31, 32, 33 on the soundproof wall 21a side (NO). S11). As a result, it is possible to prevent an abnormal temperature rise of each heat source machine 10 existing inside the soundproof wall 21a.

Similarly, when the detection temperature Tb of the air temperature sensor 52 is less than the set value Ts (YES in S12), the controller 70 intermittently executes watering by the watering nozzles 31 and 34 on the soundproof wall 21b side (S13). That is, mist-like water is intermittently discharged from the watering nozzles 31 and 34, and it falls on a plurality of heat source machines 10 mainly located inside the soundproof wall 21b. As a result, even if the opening degree Qb of each louver 121 is controlled in the shrinking direction and the airflow amount of the soundproof wall 21b is reduced, the insufficient cooling of each heat source machine 10 existing inside the soundproof wall 21b can be compensated.

However, when the detection temperature Tb of the air temperature sensor 52 rises above the set value Ts (NO in S12), the controller 70 continuously executes watering by the watering nozzles 31 and 34 on the soundproof wall 21b side (S14). .. As a result, it is possible to prevent an abnormal temperature rise of each heat source machine 10 existing inside the soundproof wall 21b.

Further, when the detection temperature Tc of the air temperature sensor 53 is less than the set value Ts (YES in S15), the controller 70 intermittently executes watering by the watering nozzles 34, 35, 36 on the soundproof wall 21c side (S16). .. That is, mist-like water is intermittently discharged from the watering nozzles 34, 35, 36, and it falls mainly on the plurality of heat source machines 10 existing inside the soundproof wall 21c. As a result, even if the opening degree Qc of each louver 141 is controlled in the shrinking direction and the airflow amount of the soundproof wall 21c is reduced, the insufficient cooling of each heat source machine 10 existing inside the soundproof wall 21c can be compensated.

However, when the detection temperature Tc of the air temperature sensor 53 rises above the set value Ts (NO in S15), the controller 70 continuously executes watering by the watering nozzles 34, 35, 36 on the soundproof wall 21c side (NO). S17). As a result, it is possible to prevent an abnormal temperature rise of each heat source machine 10 existing inside the soundproof wall 21c.

Further, when the detection temperature Td of the air temperature sensor 54 is less than the set value Ts (YES in S18), the controller 70 intermittently executes watering by the watering nozzles 33 and 36 on the soundproof wall 21d side (S19). That is, mist-like water is intermittently discharged from the watering nozzles 33 and 36, and it falls on a plurality of heat source machines 10 mainly located inside the soundproof wall 21d. As a result, even if the opening degree Qd of each louver 161 is controlled in the reduction direction and the airflow amount of the soundproof wall 21d decreases, it is possible to compensate for the insufficient cooling of each heat source machine 10 existing inside the soundproof wall 21d.

However, when the detection temperature Td of the air temperature sensor 54 rises above the set value Ts (NO in S18), the controller 70 continuously executes watering by the watering nozzles 33 and 36 on the soundproof wall 21d side (S20). .. As a result, it is possible to prevent an abnormal temperature rise of each heat source machine 10 existing inside the soundproof wall 21d.

Following this watering control, the controller 70 monitors whether or not all of the heat source machines 10 are off (S21). When at least one of the heat source machines 10 is in operation (NO in S21), the controller 70 returns to the determination in S4. When all of the heat source machines 10 are turned off (YES in S21), the controller 70 determines that soundproofing is not necessary, and determines that soundproofing is not necessary, and all the louvers 101, 121, 141 of the soundproofing walls 21a to 21d, 161 is fully opened (S22).

[Daytime]
In the daytime zone (NO in S4, YES in S23), the controller 70 is a soundproof wall within a range in which the detection sound level Na of the noise sensor 61 at the first noise monitoring point falls within the noise limit value Na3 in the daytime zone set above. The opening Qa of each louver 101 on the soundproof wall 21a is controlled so that the air flow rate of the 21a is maximized (S24).

Specifically, the controller 70 reduces the opening Qa of each louver 101 in order to reduce the sound transmitted from each heat source machine 10 to the outside of the soundproof wall 21a, and the detection sound level Na limits the noise during the daytime. When the value falls below the value Na3, the opening Qa (for example, 100%) at that time is maintained. This opening Qa is the largest in the range in which the detection sound level Na falls within the noise limit value Na2 in the daytime time zone.

Similarly, in the controller 70, the noise limit values Nb3, Nc3 in the daytime time zone set by the detection sound levels Nb, Nc, Nd of the noise sensors 62, 63, 64 at the second, third, and fourth noise monitoring points are set. The openings Qb, Qc, and Qd of the louvers 121, 141, and 161 on the soundproof walls 21b, 21c, and 21d are controlled so that the air flow rate of the soundproof walls 21b, 21c, and 21d is maximized within the range within Nd3 (S25). , S26, S27).

Specifically, the controller 70 reduces the opening degrees Qb, Qc, and Qd of the louvers 121, 141, 161 in order to reduce the sound transmitted from each heat source machine 10 to the outside of the soundproof walls 21b, 21c, 21d. When the detected sound levels Nb, Nc, and Nd fall below the noise limit values Nb3, Nc3, and Nd3 in the daytime time zone, the opening degree Qb, Qc, and Qd (for example, 100%) at that time is maintained. These opening degrees Qb, Qc, and Qd are the largest in the range in which the detected sound levels Nb, Nc, and Nd are within the noise limit values Nb3, Nc3, and Nd3 in the daytime time zone.

In this way, the maximum ventilation amount of the soundproof walls 21a to 21d is within the range in which the detection sound levels Na to Nd of the noise sensors 61 to 64 at the first to fourth noise monitoring points fall within the noise limit values Na3 to Nd3 during the daytime. By controlling the opening degrees Qa to Qd of the louvers 101 to 161 on the soundproof walls 21a to 21d, respectively, the ventilation amount of the soundproof walls 21a to 21d can be secured as much as possible, and the heat source machines 10 to the site 1 The sound transmitted to the outside can be surely suppressed to the noise regulation value N3 in the daytime time zone.

Along with this opening degree control, the controller 70 compares the detected temperature Ta of the air temperature sensor 51 inside the soundproof wall 21a with the set value Ts (S28).

When the detection temperature Ta of the air temperature sensor 51 is less than the set value Ts (YES in S28), the controller 70 turns off (stops) watering by the watering nozzles 31, 32, 33 on the soundproof wall 21a side (S29). That is, the noise regulation value N3 in the daytime time zone is not strict, and therefore the opening Qa of each louver 101 is controlled to be large and the airflow amount of the soundproof wall 21a is sufficiently secured, so that cooling by watering is unnecessary.

However, when the detection temperature Ta of the air temperature sensor 51 rises above the set value Ts (NO in S28), the controller 70 continuously executes watering by the watering nozzles 31, 32, 33 on the soundproof wall 21a side (NO). S30). As a result, it is possible to prevent an abnormal temperature rise of each heat source machine 10 existing inside the soundproof wall 21a.

Similarly, when the detection temperature Tb of the air temperature sensor 52 is less than the set value Ts (YES in S31), the controller 70 turns off the watering by the watering nozzles 31 and 34 on the soundproof wall 21b side (S32). The noise regulation value N3 during the daytime is not strict, and therefore the opening Qb of each louver 121 is controlled to be large and the airflow amount of the soundproof wall 21b is sufficiently secured, so that cooling by sprinkling is unnecessary.

However, when the detection temperature Tb of the air temperature sensor 52 rises above the set value Ts (NO in S31), the controller 70 continuously executes watering by the watering nozzles 31 and 34 on the soundproof wall 21b side (S33). .. As a result, it is possible to prevent an abnormal temperature rise of each heat source machine 10 existing inside the soundproof wall 21b.

Further, when the detection temperature Tc of the air temperature sensor 53 is less than the set value Ts (YES in S34), the controller 70 turns off the watering by the watering nozzles 34, 35, 36 on the soundproof wall 21c side (S35). The noise regulation value N3 during the daytime is not strict, and therefore the opening Qc of each louver 141 is controlled to be large and the airflow amount of the soundproof wall 21c is sufficiently secured, so that cooling by sprinkling is unnecessary.

However, when the detection temperature Tc of the air temperature sensor 53 rises above the set value Ts (NO in S34), the controller 70 continuously executes watering by the watering nozzles 34, 35, 36 on the soundproof wall 21c side (NO). S36). As a result, it is possible to prevent an abnormal temperature rise of each heat source machine 10 existing inside the soundproof wall 21c.

Further, when the detection temperature Td of the air temperature sensor 54 is less than the set value Ts (YES in S37), the controller 70 turns off the watering by the watering nozzles 33 and 36 on the soundproof wall 21d side (S38). The noise regulation value N3 during the daytime is not strict, and therefore the opening Qd of each louver 161 is controlled to be large and the airflow amount of the soundproof wall 21d is sufficiently secured, so that cooling by sprinkling is unnecessary.

However, when the detection temperature Td of the air temperature sensor 54 rises above the set value Ts (NO in S37), the controller 70 continuously executes watering by the watering nozzles 33 and 36 on the soundproof wall 21d side (S39). .. As a result, it is possible to prevent an abnormal temperature rise of each heat source machine 10 existing inside the soundproof wall 21d.

Following this watering control, the controller 70 monitors whether or not all of the heat source machines 10 are off (S21). When at least one of the heat source machines 10 is in operation (NO in S21), the controller 70 returns to the determination in S4. When all of the heat source machines 10 are turned off (YES in S21), the controller 70 determines that soundproofing is not necessary, and determines that soundproofing is not necessary, and all the louvers 101, 121, 141 of the soundproofing walls 21a to 21d, 161 is fully opened (S22).

[Night time zone]
During the night time (NO in S4, NO in S23), the controller 70 instructs all the heat source machines 10 that are turned on to set the low noise mode for operating the fan 12 at a low rotation speed (S40). ). Then, the controller 70 is a soundproof wall so that the ventilation amount of the soundproof wall 21a is maximized within the range where the detection sound level Na of the noise sensor 61 at the first noise monitoring point falls within the noise limit value Na1 in the nighttime zone set above. The opening Qa of each louver 101 in 21a is controlled (S41).

Specifically, the controller 70 reduces the opening Qa of each louver 101 in order to reduce the sound transmitted from each heat source machine 10 to the outside of the soundproof wall 21a, and the detection sound level Na limits the noise during the night time. When the value falls below the value Na1, the opening Qa (for example, 10%) at that time is maintained. This opening Qa is the largest in the range in which the detection sound level Na falls within the noise limit value Na1 in the night time zone.

Similarly, the controller 70 has a range in which the detection sound levels Nb, Nc, Nd of the noise sensors 62, 63, 64 at the second, third, and fourth noise monitoring points fall within the noise limit values Nb1, Nc1, Nd1 set above. The openings Qb, Qc, and Qd of the louvers 121, 141, 161 on the soundproof walls 21b, 21c, and 21d are controlled, respectively, so that the air flow rate of the soundproof walls 21b, 21c, and 21d is maximized (S42, S43, S44). ).

Specifically, the controller 70 reduces the opening degrees Qb, Qc, and Qd of the louvers 121, 141, 161 in order to reduce the sound transmitted from each heat source machine 10 to the outside of the soundproof walls 21b, 21c, 21d. When the detection sound levels Nb, Nc, Nd fall below the noise limit values Nb1, Nc1, Nd1, the opening degree Qb, Qc, Qd (for example, 10%) at that time is maintained. These openings Qb, Qc, and Qd are the largest in the range in which the detected sound levels Nb, Nc, and Nd are within the noise limit values Nb1, Nc1, and Nd1 in the night time zone.

As described above, the maximum ventilation amount of the soundproof walls 21a to 21d is within the range in which the detection sound levels Na to Nd of the noise sensors 61 to 64 at the first to fourth noise monitoring points fall within the noise limit values Na1 to Nd1 in the night time zone. By controlling the opening degrees Qa to Qd of the louvers 101 to 161 on the soundproof walls 21a to 21d, respectively, the ventilation amount of the soundproof walls 21a to 21d can be secured as much as possible, and the heat source machines 10 to the site 1 The sound transmitted to the outside can be surely suppressed to the noise regulation value N1 in the night time zone.

Along with this opening degree control, the controller 70 continuously executes watering by all the watering nozzles 31 to 36 regardless of the detection temperatures Ta, Tb, Tc, and Td of the air temperature sensors 51, 52, 53, 54 ( S45, S46, S47, S48). As a result, even if the openings Qa, Qb, Qc, and Qd of the louvers 101, 121, 141, 161 are controlled in the shrinking direction and the airflow amount of the soundproof walls 21a to 21d is reduced, the heat source machine 10 Insufficient cooling can be compensated.

Following this watering control, the controller 70 monitors whether or not all of the heat source machines 10 are off (S21). When at least one of the heat source machines 10 is in operation (NO in S21), the controller 70 returns to the determination in S4. When all of the heat source machines 10 are turned off (YES in S21), the controller 70 determines that soundproofing is not necessary, and determines that soundproofing is not necessary, and all the louvers 101, 121, 141 of the soundproofing walls 21a to 21d, 161 is fully opened (S22).

[Modification example]
In the above embodiment, the noise sensors 61 to 64 are arranged at the first to fourth noise monitoring points between the soundproof walls 21a to 21d and the site boundary lines 2a to 2d, but the noise sensors 61 are arranged at the site boundary lines 2a to 2d. ~ 64 may be arranged. In this case, the noise limit value N becomes the noise limit values Nas, Nbs, Ncs, and Nds as they are. It is not necessary to convert the noise limit value N to the noise limit values Nas, Nbs, Ncs, and Nds, and the burden on the controller 70 can be reduced accordingly.

In the above embodiment, the four soundproof walls 21a to 21d are sequentially connected in a rectangular shape, but the number and shape of the soundproof walls are appropriately determined according to the arrangement of the heat source machines 10 and the shape of the rooftop plane 4. It should be selected as.

In the above embodiment, the case where the same opening Qa is set for all of the louvers 101 has been described as an example, but the opening Qa whose values are slightly different in the height direction of each louver 101 is set stepwise. May be good. For example, a large opening Qa is set for one or a plurality of louvers 101 at a low height position, and an opening Qa that gradually decreases as the height position becomes higher is set stepwise for each louver 101. You may. Since each heat source machine 10 takes in air at a low height position as heat exchange air and discharges the air after heat exchange upward, set a large opening Qa at a low height position. By setting the opening Qa that gradually decreases as the height position increases, heat exchange air is efficiently taken into each heat source machine 10 while obtaining the same effect as that of the above embodiment for noise suppression. You can do it.

In addition, the above-described embodiment is presented as an example, and is not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, rewrites, and changes can be made without departing from the gist of the invention. In these embodiments, the scope of the invention is included in the gist, and is also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Site, 2a-2d ... Site boundary line, 3 ... Building, 4 ... Rooftop plane, 10 ... Heat source machine, 21a-21d ... Soundproof wall, 31-36 ... Watering nozzle (watering means), 51-54 ... Air temperature Sensor, 61-64 ... Noise sensor, 70 ... Controller, 86 ... Mute plate, 100, 120, 140, 160 ... Air volume adjustment mechanism, 101, 121, 141, 161 ... Luber

Claims (9)

Equipped with multiple louvers that adjust the amount of ventilation according to changes in opening , a soundproof wall that surrounds the heat source machine,
A control means for controlling the opening degree of each louver within a range in which the sound transmitted outside the site of the facility where the heat source machine is installed falls within the noise regulation value.
Equipped with a,
The control means is such that the sound of the plurality of noise monitoring points outside the soundproof wall falls within the noise limit values set for each noise monitoring point based on the noise regulation value. The opening degree of each louver is controlled so that the air volume of the louver is maximized.
Noise reduction device. The control means
In nighttime, the sound of the noise monitoring point, in that range that fits to the respective noise limit values for nighttime for each noise monitoring point is set based on the noise regulation value for the night, the each louver The opening degree of each louver is controlled so that the air volume is maximized.
In the morning and evening hours, the sound of the noise monitoring point, the noise limit value for the morning and evening is set based on the noise regulation value for the morning and evening for each noise monitoring point (> noise regulation value for the nighttime) to the extent that fit respectively, wherein as the airflow amount of each louver is maximized, by controlling the opening degree of each of the louvers,
In daytime, the sound of the noise monitoring point, each noise noise regulation value for daytime to monitor points each noise limit for daytime is set based on (> the noise regulation value for morning and evening) to the extent that fit each aeration amount of the respective louvers is such that the maximum, to control the opening degree of each of the louvers,
The noise reduction device according to claim 1. Further provided with a sprinkling means for sprinkling water on the heat source machine,
The control means
In the night time zone, watering by the watering means is continuously executed.
In the morning and evening hours, watering by the watering means is intermittently performed.
Stop watering by the watering means during the daytime .
The noise reduction device according to claim 2. Further provided with a sprinkling means for sprinkling water on the heat source machine,
The control means
In the morning and evening hours, when the air temperature inside the soundproof wall is less than the set value, watering by the watering means is intermittently executed, and when the air temperature inside the soundproof wall is equal to or higher than the set value, the watering is performed. Continuously sprinkle water by sprinkling means,
In the daytime zone, when the air temperature inside the soundproof wall is less than the set value, watering by the watering means is stopped, and when the air temperature inside the soundproof wall is equal to or higher than the set value, the watering means Watering by continuous or intermittent ,
The noise reduction device according to claim 2. The soundproof wall is arranged in an upright position around the heat source machine on the roof of the building .
The noise reduction device according to any one of claims 1 to 4. The soundproof wall is formed by arranging a plurality of sound deadening plates on the upper edge portion.
Each of the louvers is arranged at a position below each of the sound deadening plates on the soundproof wall .
The noise reduction device according to claim 5. The heat source machine is a plurality of heat source machines installed on the roof of a building.
The soundproof wall is a first soundproof wall arranged at a position facing the front surface of the building; a second soundproof wall arranged at a position facing the left side surface of the building; a position facing the back surface of the building. Third soundproof wall; a fourth soundproof wall arranged at a position facing the right side surface of the building.
Each louver, the first louver to adjust the air flow of the first deadening wall by opening variation corresponding to the rotational position rotatably provided on the first deadening wall; the second soundproofing wall A second louver that is rotatably provided and adjusts the ventilation amount of the second soundproof wall by changing the opening degree according to the rotation position; A third louver that adjusts the amount of ventilation of the third soundproof wall by changing the opening degree; It is the fourth louver that adjusts the amount,
The control means
The first noise barrier is within a range in which the sound of the first noise monitoring point outside the first noise barrier falls within the first noise limit value set for the first noise monitoring point based on the noise regulation value. The opening degree of the first louver is controlled so that the air volume of the first louver is maximized.
The second noise barrier is within a range in which the sound of the second noise monitoring point outside the second noise barrier falls within the second noise limit value set for the second noise monitoring point based on the noise regulation value. The opening degree of the second louver is controlled so that the air volume of the second louver is maximized.
The third noise barrier is provided within a range in which the sound of the third noise monitoring point outside the third noise barrier falls within the third noise limit value set for the third noise monitoring point based on the noise regulation value. The opening degree of the third louver is controlled so that the air volume of the third louver is maximized.
The fourth noise barrier is within a range in which the sound of the fourth noise monitoring point outside the fourth noise barrier falls within the fourth noise limit value set for the fourth noise monitoring point based on the noise regulation value. The opening degree of the fourth louver is controlled so that the air volume of the fourth louver is maximized.
The noise reduction device according to claim 1. Equipped with multiple louvers that adjust the amount of ventilation according to changes in opening , a soundproof wall that surrounds the heat source machine,
A control means for controlling the opening degree of each louver within a range in which the sound transmitted outside the site of the facility where the heat source machine is installed falls within the noise regulation value.
Equipped with a,
The control means is such that the sound of the plurality of noise monitoring points outside the soundproof wall falls within the noise limit values set for each noise monitoring point based on the noise regulation value. The opening degree of each louver is controlled so that the air volume of the louver is maximized.
Noise reduction system. The sound barrier is provided with a muffler plate the upper edge, comprising the respective louvers to the position of the lower side of the muffler plate,
The noise reduction device according to any one of claims 1 to 7, or the noise reduction system according to claim 8 .

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