Abstract
Air-conditioning noise is, of course, only one part of the background noise spectrum for a space, but it has become significant over the last decade as more high velocity systems are being installed, and as people have become more sensitive to internal noise sources in buildings well insulated from the external environment. Research has been carried out to investigate the nature and level of sound emitted in rooms served by air-conditioning systems. An initial survey measured the sound spectra in 74 university lecture rooms. Fans, motors, vee-belt drives and an airflow system were then installed to serve one lecture room. It was found that the sound pressure level in the room could be predicted by the equation: L=40 v 17 +1 or: L=37.4 N 2110 +1 where L is the sound pressure level in dB(A), v is the air velocity in the main duct and N is the fan speed (rpm). Further field studies are being undertaken on many systems in buildings to find out if a general formula can be applied in practice.
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