EXPERIMENTAL INVESTIGATION OF NOISE PARAMETERS IN HVAC SYSTEMS

Abstract

Heating, ventilating and air-conditioning (HVAC) systems represent a major source of inside buildings noise with a negative effect on the acoustical environment, so beneficiaries are in particular annoyed by the noise generated from the radiant unit and the air circulating ducts. The technical data presented in manufacturer’s catalogues highlight the relations between the air flow, pressure, power-charging and the sound level. The measurements presented in this paper are carried out at different fan’s speeds, ranging the power-charge from 30% to 100% and static air pressure is slowly adjusted between 0 Pa to 500 Pa. Third-octave band analysis of random noise of the handling units is realized in an anechoic room and agrees the requirements of ISO 3744:2011 and ISO 5136:2010 standards. The experimental methodology used in this paper is of real interest for the HVAC manufacturers in order to rate the sound level of their products.