Regarding the noise treatment of air-conditioning ducts

In the actual installation project, the following methods are used for the air distribution pipe. Since the sound can be directly transmitted to the room, there is a certain amount of noise. The following discusses the noise treatment methods of several air distribution pipes: 1. Ceiling return air In order to reduce the noise of the air duct machine, under certain conditions, ceiling return air can be used. Disadvantages: The indoor unit returns the wind in the ceiling, which is equivalent to air-conditioning the entire ceiling. For the room, it reduces the cooling capacity of a small section. Therefore, when the ceiling returns to the air, the ceiling space is as small as possible. Advantages: (1) Material saving (no return air duct, etc.), simple and quick installation; (2) Sound waves are reflected and absorbed in the ceiling after coming out of the air inlet of the internal machine, and the noise at the return air outlet is reduced. Requirements: (1) Prerequisite for ceiling return air: The entire ceiling space, except for the return air outlet, should be separated from other rooms, bathrooms and corridors by a wall, tightly airtight, and the indoor unit must draw in the air from the room. . (2) Sufficient return air space must be left between the indoor unit and the partition wall, and between the indoor unit and the ceiling. The surface of the partition wall facing the air inlet of the duct machine (and the floor around the air inlet in the ceiling, the ceiling) can be pasted with a layer of sound-absorbing material with a thickness of 10-20mm, which can further absorb and reduce noise. When the ceiling returns air, the louver return air vent can be separated from the air inlet of the indoor unit to reduce noise. For example, when the indoor unit is located in the middle of the ceiling, the return air vent can be opened on both sides (or one side) of the ceiling. When the owner requests to reduce the opening of the ceiling, the inspection port and the return air vent can be applied. There are two treatment methods: (1) Install an openable return air vent of not less than 450X450 at the ceiling on the inspection side of the indoor unit. (2) Taking into account the needs of motor inspection, a longer return air outlet can be set under the motor (at the same time it can be inspected to the motor, electrical box, and refrigerant departments), which also serves as an inspection port. 2. Dust pipes before and after the air duct machine, and set the air duct elbow. The dust pipe before and after the air duct machine, and the installation of the air duct elbow under the prerequisite conditions is a good way to reduce noise. The noise is refracted and absorbed when it passes through the elbow. , There will be a significant attenuation. It is recommended to use the centrifugal glass wool composite air duct with sound absorption function with the inner wall of the glass cloth coated surface for the air distribution duct, which has a good noise reduction effect.

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