Abstract: The noise of the heating, ventilation and air-conditioning(HVAC) system is the major factor affecting the cabin noise level. The acoustic performance tests have been carried out for the various sizes of the impedance composite muffler and the traditional dissipative muffler, in order to guide the design of the marine HVAC system and to reduce the noise level of the HVAC system. The results show that the basic noise reduction of the dissipative muffler can reach 15dB(A)/m. While for the impedance composite muffler with the twice external size of the dissipative muffler, its noise reduction performance is improved in the low frequency range. However, the A-weighted total noise reduction has not changed significantly for the impedance composite muffler. It can provide reference for the selection of the muffler and the design of the HVAC system.

Key words: air conditioning system, muffler, noise reduction, experiment

摘要： 空调通风系统噪声是影响舱室噪声水平的重要因素。为指导船舶空调通风系统设计,降低空调通风系统噪声水平,文章对多种尺寸阻抗复合型消声器设计与传统纯阻性消声器进行声学性能试验。结果表明：纯阻性消声器能达到15 dB（A）/m的基本消声量;阻抗复合型消声器相比纯阻性消声器,其外形尺寸增加1倍,虽在低频段消声性能有所改善,但A计权总消声量并无较大变化。研究结果为消声器选择及空调系统设计提供了依据。

关键词: 空调系统, 消声器, 消声量, 试验