Abstract
The noise produced by an air conditioner may be caused by several mechanical and aerodynamic sources. This abstract presents an experimental attempt to characterize and compare the noise sources of a residential split unit air conditioner. In the split unit studied in this research, the compressor and condenser and associated fans are normally located outdoors. Therefore, they were removed from the unit and did not form part of the studies. Care was taken with the unit to separate the inlet and exhaust noise from the noise radiated from the cabinet. The measurements were made with a two-microphone sound intensity probe and these resulted in sound power level data. The sound power levels produced by radiation from the inlet, exhaust, and cabinet were obtained for five different volume flow rates. The effect on the sound power generated by removing the coil and adding a damper in the exhaust was investigated. Measurements and subjective studies show that the low-frequency sound is predominantly radiated from the exhaust and inlet. At high frequency, the cabinet noise dominates. The measuring procedure and data obtained are relevant to industry involved in development and manufacture. [Work supported by both Trane Corporation and Bruel & Kjaer.]
Published Version
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