Abstract: Based on design requirements for the air volume increase and noise reduction of air-conditioning outdoor unit, this paper studies the influence factors of the mesh enclosure density, wind wheel position and air-guided ring length on air volume and noise of outdoor unit. The result shows that, the air volume increases with the increasing of the mesh enclosure density, the noise change will decrease 0.5dB under the same air volume. Which illustrate that increasing the mesh enclosure density is conductive to improve the air volume and reducing noise. As the wind wheel moves forward, the air volume outdoor increases about 20~30m³/s, while the noise will decrease 0.5dB under the same air volume. Which illustrate that moving forward the wind wheel is conductive to improve the air volume and reduce noise. The air volume outdoor increases 80~100m³/s with the increasing of the air-guided ring length, while the noise can be decreased by 1.0dB under the same air volume. Which illustrate that increasing the air-guided ring length is conducive to improve the air volume and reduce noise. However, the mesh enclosure density increase and the wind wheel forward both are limited by design specifications, while the length increases of the air-guided ring length is limited by the metal material and processing technology.

Key words: Air conditioner outdoor unit, Mesh enclosure, Wind wheel, Air-guided ring, Air volume, Noise