Introduction
This Blog Post is taken from the latest MACH
Acoustics book “The Acoustics of Open Windows” – Chapter “The Future of
Windows”. This book can be downloaded as
an iBook from: https://itunes.apple.com/gb/book/the-acoustics-of-open-windows/id1049860606?mt=13
This book publishes part of Ze Nunes’ ongoing
PHD, on the subject of visualizing sound and air in low carbon buildings.
At MACH we see that natural
ventilation is one of the strategies of choice for forward thinking clients
interested in low-energy buildings. However environmental noise break-in can be
an issue, resulting in clumsy acoustic attenuators or windows being kept shut.
MACH
Acoustics recognizes the benefits of noise control through window design. The
team at MACH has therefore developed unique modeling tools, assessing noise
mitigation solutions based around improving the acoustic performance of open
windows, such to overcome noise break-in issues to residential buildings,
offices and schools.
Extended Window Frame
One
of the key factors affecting the sound reduction of an open window, is its
ability to screen sound, i.e. the harder it is to see the sound source through
the opening of the window, the better its acoustic performance. Hence by simply
extending the frame of the window, as shown, the sound reduction of a simple
window can be enhanced. The next two slides illustrate this effect, with an
interactive model showing the effects of extending the frame and a video
providing a subjective illustration of this change.
Baffled Facades – Illustrations
An
alternative way of enhancing the performance of an open window it is place a
baffle over its opening. MACH Acoustics’ analytical tools and measurements
facility can be used to determine the size and position of the baffle such to
provide the required acoustic performance from an open window.
No comments:
Post a Comment