Abstract: Expansion muffler is a widely used component in air conditioner to improve the transmission sound of compressors. The acoustic finite element method is applied to study the transmission loss of air-conditioning discharge pipes equipped with mufflers. It is found that two additional constriction mufflers can be formed in the pipeline, and the overall sound attenuation is much greater than that of the expansion muffler. Therefore, reasonable design of muffler position and pipe length can achieve the effect of muffler and make the cost more economical.

Key words: Air conditioner pipeline, Muffler, Acoustic FEM