New window system cuts sound ranges by 26 decibels, achieves 4 occasions higher air flow

Honorary Fellow Dr Lee Siew Eang (left) and Dr Eddie Lau Siu-Package (proper) from NUS Faculty of Design and Atmosphere, with the acoustic pleasant air flow window put in on the NUS-CDL Sensible Inexperienced Residence. Credit score: Nationwide College of Singapore

Residence house owners, particularly these in noisy districts, can sit up for higher residing consolation with a brand new invention by researchers from the Nationwide College of Singapore (NUS) Faculty of Design and Atmosphere (SDE) that reduces out of doors noise and improves indoor air flow.

Referred to as the acoustic pleasant air flow window (AFVW), this novel system cuts setting noise ranges by 26 decibels (dB), which is roughly greater than a fourfold discount when it comes to a human’s notion of loudness. It may well additionally obtain 4 occasions higher air flow than an open standard window.

City noise has lengthy been an issue for high-density cities similar to Singapore the place the common out of doors sound stage is about 69.4 dB. To forestall out of doors noise, an enclosed air-conditioned house can be a super answer. Nevertheless, this is able to imply elevated vitality consumption and diminished pure air flow. On the identical time, as the worldwide unfold of COVID-19 continues, extra consideration has additionally been paid to redesigning constructed setting and areas to make sure sustainability, bodily well-being and emotional wellness.

With a deal with enhancing wellness, aural consolation and indoor air high quality, Dr. Eddie Lau Siu-Package from the Division of Structure and Honorary Fellow Dr. Lee Siew Eang from the Division of Constructing, had developed the AFVW along with former colleagues Dr. Du Liangfen and Mr Martin Konrad Danzer, who had each labored on the undertaking whereas they have been with SDE.

Higher noise discount and air flow

Adopting labyrinth air path and sound absorption strategies which have higher noise discount at a broader vary of frequencies, the AFVW was fabricated and put in on the NUS-CDL Sensible Inexperienced Residence for testing since December 2019.

New window system cuts sound levels by 26 decibels, achieves four times better ventilation
Lead researcher Dr Eddie Lau Siu-Package from the NUS Faculty of Design and Atmosphere putting in the mechanical air flow system for the Acoustic Pleasant Air flow Window, which is ready to obtain 4 occasions higher air flow than an open standard window. Credit score: Nationwide College of Singapore

Measuring peak 1.8m by width 0.88m by thickness 0.15m, the AFVW consists of two layers of glass panes with two staggered vents and a mechanical air flow system. The glass panes are designed 0.6 cm thick and are set 8.5 cm aside. With a view to obtain higher sound insulation efficiency, sound absorbers are put in alongside the perimeters between the glass panes.

Sound checks based mostly on worldwide requirements performed on the NUS-CDL Sensible Inexperienced Residence confirmed that the mix of the double glass panes and the sound absorbers was in a position to cut back typical visitors noise by 26 dB. This successfully implies that the human’s notion of loudness is diminished by greater than 4 occasions. Each 10 dB discount in sound ranges is about half of the human’s notion of loudness.

Whereas maintaining the noise out, the AFVW can also be in a position to present pure air flow by way of two open vents. Air stream passes by way of a staggered vent on the backside of the window and out by way of one other staggered vent on the high. A mechanical air flow system is put in in between the glass panes to reinforce the indoor air change. Utilizing tracer fuel simulating as a “pollutant” which was injected right into a room put in with the AFVW and one other with an open standard window, the group discovered that the focus of tracer fuel, i.e. the elimination of the “pollutant,” decreases 4 occasions sooner for the AFVW than for open standard home windows.

Which means the system might probably enhance thermal consolation with minimal vitality consumption in comparison with pure air flow. A mud particle filter, just like these utilized in air-conditioning items, can be added to the system to filter mud particles or pollution.

“The AFVW offers extra air flow in addition to sound insulation for the indoor setting, and that is significantly essential for enhancing indoor air high quality and probably mitigating the unfold of infectious illnesses,” shared Dr. Eddie Lau, chief of the analysis group.

New window system cuts sound levels by 26 decibels, achieves four times better ventilation
Credit score: Nationwide College of Singapore

Pilot trial at CDL premises

The AFVW prototype will likely be put in at Metropolis Developments Restricted’s (CDL) premises for take a look at bedding and system refinements to make it viable for industrial and residential residing purposes. That is a part of a partnership below two NUS-CDL platforms: the NUS-CDL Sensible Inexperienced Residence and Tropical Know-how Labs.

Esther An, CDL chief sustainability officer, mentioned, “By means of championing modern innovation, CDL continues to implement inventive sustainable options that additional the standard of the properties we develop. Our deal with inexperienced constructing and know-how purposes ensures we offer much more wellness and luxury to cater to the wants of at this time’s householders. We’re excited for a profitable pilot of the AFVW, which might probably see its software pioneering at our future developments.”

Contributing to sustainability analysis at NUS-CDL Sensible Inexperienced Residence

The NUS-CDL Sensible Inexperienced House is a singular indoor test-bed setting that serves as a platform for holistic and modern experimental research on good options, inexperienced constructing applied sciences and design for sustainable residing.

Located in SDE4, Singapore’s first new-build net-zero vitality constructing, NUS-CDL Sensible Inexperienced House is a 100 m2 full-size residence designed for plug-and-play experimentation of recent good supplies, methods and finishes.

“The AFVW is considered one of SDE’s many analysis outcomes strategically aligned with our “Properly & Inexperienced’ imaginative and prescient that emphasizes a people-centric built-in design strategy. The NUS-CDL Sensible Inexperienced Residence permits customisation to facilitate cross-disciplinary analysis and improvement, finally making a well-designed and wholesome indoor setting,” mentioned SDE Dean Professor Lam Khee Poh.


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New window system cuts sound ranges by 26 decibels, achieves 4 occasions higher air flow (2021, February 4)
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