Abstract
A balcony in a domestic flat provides residents an outdoor living space as well as better ventilation to improve indoor air quality. However, balcony door when open for natural ventilation will allow outdoor noise transmit into the residential flat. Innovative acoustic balcony design by installation of sound absorptive panels onto the balcony ceiling and side walls of balcony has been implemented in Hong Kong for mitigating road traffic noise. Recently, combined balcony with an extension of utility platform for installation of air-conditioning outdoor unit has become popular. However, the parapet of the extension used a three-sided air grille with 70% permeability for heat dissipation purpose. Acoustically, the issue is noise leakage through the air grille comparing to a solid parapet. This paper discusses the development of acoustic louvres to replace the air grille in order to improve the noise reduction abilities of acoustic combined balconies. Several acoustic louvres of different configuration are developed. Validation of improvement in noise reduction of the acoustic combined balcony in a mock-up flat is conducted in accordance with ISO 16283-3.
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