Experimental study on noise reduction and ventilation performances of sound-proofed ventilation window

The sound-proofed ventilation window (SPVW) is experimentally investigated in the present study for reducing noise transmission and supplying sufficient air for an arbitrary space. The SPVW consists of two layers of glass panes with two staggered vents and a mechanical ventilation system integrated within the cavity between the two glass panes. With the SPVW installed in a bedroom of the test-bedding facility in the NUS-CDL smart green home, the apparent sound reduction index (SRI) and air changes per hour (ACH) performed by the SPVW have been measured, under different conditions including the opened or closed vents and/or the operating or idle ventilation system. The experimental results indicate that the SPVW with the opened vents and the operating ventilation system provides an optimal solution for both noise reduction and ventilation performances among all the cases. The weighted SRI of this case is 13 dB higher than that of a conventional window with a similar open surface area, while the contributed ACH is 4 times higher.