Evaluation of acoustic performance in smart ventilated windows with integrated heat storage

Windows are essential façade components that balance multiple functions, including daylighting, natural ventilation, and thermal regulation. However, conventional windows often suffer from significant energy losses and inadequate air exchange, even with regular ventilation. To address these challenges, the iclimabuilt project has developed a smart, ventilated window that integrates advanced technologies, including PCM (phase-change material) heat storage, triple glazing with air-filled chambers for enhanced thermal insulation, and 3D-printed components for noise reduction and air purification. These innovations minimise energy losses, improve thermal management, and promote occupant health and well-being. This study focuses on evaluating the acoustic performance of the three operational modes of the fans integrated into the window of a Living Lab environment. Noise measurements were conducted in accordance with EN ISO 16032:24, both with and without an acoustic filter installed in the PCM box and air filtration unit. Data were collected from three microphone positions: a corner and two reverberant field points. The analysis reveals that the noise levels generated by the fans are in the 35–45 dB range, exceeding standard limits. Moreover, the findings highlight the need to further optimise noise control strategies in smart window design while maintaining their energy efficiency and indoor air quality benefits.