An example analysis of noise reduction and noise reduction of China trlon central air conditioning cooling tower:
Question: A cooling tower of central air-conditioning equipment is installed on the top of the multi-story building of a building, and the surrounding area is residential quarters. The volume of the cooling tower is 75 cubic meters/h. When the building is in use, the cooling tower has to be operated at 10 o'clock in the evening, and the noise interferes with the rest of the surrounding residents. Therefore, noise reduction and sound insulation equipment is implemented for the cooling tower. When it is operating in broad daylight, the refrigerator often stops the operation of the equipment due to the disconnection of the UHV protection.
The main reason: In the current period of strict management of noise standards, not only the interference to the building, but also the interference of the surrounding environment must be taken into consideration when formulating equipment such as cooling towers. However, when controlling the noise of the cooling tower, this project added a lot of noise reduction equipment to increase the resistance of the air, so that the exhaust air volume of the cooling tower is reduced, the cooling capacity is reduced, and the temperature of the cooling water is increased. The high-voltage protection is disconnected.
Preventive measures: The key to the noise of the cooling tower is the noise of the exhaust fan and the noise of falling water. In order to deal with the noise of the exhaust fan, a silencer elbow is added at the entrance and exit of the exhaust fan, and the opening is facing away from the dwelling house. A waterproof glass wool board is attached to the elbow. The implementation of peripheral sound insulation solutions for falling water noise, both of these measures increase the resistance of the tower. The best choice is to use an ultra-low noise cooling tower, and to block one side of the residential area with a soundproof wall, the actual effect is more ideal.
Problem: Noise in the refrigeration unit room. The refrigeration unit room of a certain engineering project has a total area of 350m2. It is equipped with 5 8S-12.5 compressors and 3 units are in normal operation. The average noise in the height of the room is 91dB(A). The noise in front of the doors and windows of the machine room is 78.5dB(A). The application unit reflects the large noise and requires sound insulation and noise reduction treatment. There are 3 cooling towers on the top of the machine room, and the noise is also loud.
The main reason: no measures to control noise are implemented in the computer room, and the noise source of the refrigeration unit room is mainly the noise of the refrigeration unit and water pump, and the noise of the refrigeration unit is usually the most important, and it is related to the model, specification and number of the refrigeration unit. It is related to the civil construction conditions of the refrigeration unit room. Outdoor cooling towers are also of high-noise type.
Preventive measures: In order to reduce the noise in the refrigeration unit room, the following measures have been implemented:
1. In the flat roof room at the upper end of the unit area, the sound-absorbing body is vertically suspended in a plate-like range, a total of 5 rows, the row spacing is 1.4m, and the bottom of the sound-absorbing body is 2.2m high. The purpose is to absorb the reverberation in the computer room and reduce the noise level in the computer room. .
2. Close the original windows and gates, make a sound gate inside the gate, and make sound absorption treatment inside the sound gate.
3. Range sound-absorbing body and motor muffler cover are also added to the water pump room.
4. A large-scale steel structure engineering L-shaped sound insulation barrier has been added to the cooling tower. The long side is 22m long, the short side is 7m, and the average height is 6m. After the above sound insulation and noise reduction measures, it is measured that the noise in the computer room is reduced from 92dB(A) to 87dB(A), and the outdoor noise standard is also reduced to about 70dB(A).
Guangdong Trlon Energy-saving Air Conditioning Equipment Co., Ltd.
Company Address： 1916A, Block A, David Donglong Business Building, Longhua, Longhua District, Shenzhen