Abstract
Plenum windows that ensure noise reduction and natural ventilation at the same time have been studied by many researchers. Without sacrificing the window transparency and ventilation, limited acoustical treatments could be implemented in the cavity between two glass panes to enhance noise reduction performance of plenum windows, and accordingly the sound insulation performance by plenum windows hits a bottleneck. Ventilation partition with a similar configuration to plenum windows and consisting of two opaque partition panels with staggered openings is proposed. The paper experimentally studies the sound transmission loss of six ventilation partitions with different acoustical treatments. The measurement results show that their sound transmission class (STC) ratings can be up to 21 STC points higher than that without any acoustical treatment, and the sound transmission losses are even higher than that of a closed single-layered partition at middle and high frequencies with respect to specific designs. The STC of the six ventilation partitions with acoustical treatments investigated in the present study is between STC 22 and STC 32, more than 11 STC points higher than that without any treatment.
Highlights
Singapore as a country near the equator has a tropical climate, the temperature record from the Year 1981 to Year 2010 displays that 24-h mean temperatures over 12 months are between 26.4 °C to 28.3 °C [1]
The non-transparent sound absorbers of good sound absorption performance would help to significantly increase noise reduction levels of ventilation windows if the light penetration is not taken into account
The sound absorbers made up of fibreglass were placed in 6 different patterns in the cavity between the two panels, the transmission loss (TL) of 6 different ventilation partitions with sound absorbers were measured in the laboratory environment
Summary
Singapore as a country near the equator has a tropical climate, the temperature record from the Year 1981 to Year 2010 displays that 24-h mean temperatures over 12 months are between 26.4 °C to 28.3 °C [1]. In order to not sacrifice window transparency, besides of using transparent devices, another way to achieve better noise reduction performance is leaving as much as possible space between two glass panes, so that more acoustical treatments could be implemented along the window frame. This is probably the reason that most ventilation windows are much thicker than conventional windows in the mentioned references [5,11,12].
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