关键词: 空调系统, 消声器, 消声量, 试验

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