Comparison of the Sound Quality Characteristics for the Outdoor Unit of the Air-Conditioners according to the Compressors

摘要

As for the criteria to purchase an air conditioner, noise level has emerged as an important issue, equal to designrncharacteristics and performance. The main feature of the noise of the outdoor unit is a complex characteristic noiserndue to the operation of the fan and compressor. Air-borne noise is usually caused by the vortex separation on the fanrnblade, and structure-borne noise is caused by compressor or vibration transmission to the chassis and components.rnDue to the efforts of researchers and designers who have worked on noise reduction, the sound pressure level (SPL)rnof outdoor units launched on the market is under 50dB (A). While the SPLs of the noises are similar, consumers canrnfeel the noise differently according to the frequency characteristics. Therefore in this study, it was purposed tornevaluate sound quality by a comparative analysis of the noise characteristics, and tests were performed on the samernoutdoor unit only changing the compressors. To analyze the noise characteristics of the outdoor unit of the airconditioner,rnsound quality metrics such as Unbiased Annoyance (UA) and Psychoacoustic Annoyance (PA) werernapplied.