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Llwynderw Primary School: Nva Case Study

Llwynderw Primary School used natural ventilation through a vented facade and openable windows to cross ventilate classrooms via a central chimney. This saved costs while simplifying construction. MACH Acoustics worked with architects to develop a ventilation strategy using noise maps. Classrooms were vertically stacked with a single central chimney venting through natural towers. This recovered floor area while meeting acoustic standards through the use of MACH's NAT Vent Attenuator, resulting in a sustainable and cost-effective design.

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Peter Dudas
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197 views2 pages

Llwynderw Primary School: Nva Case Study

Llwynderw Primary School used natural ventilation through a vented facade and openable windows to cross ventilate classrooms via a central chimney. This saved costs while simplifying construction. MACH Acoustics worked with architects to develop a ventilation strategy using noise maps. Classrooms were vertically stacked with a single central chimney venting through natural towers. This recovered floor area while meeting acoustic standards through the use of MACH's NAT Vent Attenuator, resulting in a sustainable and cost-effective design.

Uploaded by

Peter Dudas
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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NVA CASE STUDY:

LLWYNDERW
PRIMARY SCHOOL
Application:
Chimney Cross Ventilation

Llwynderw Primary School is a project in Abergaveny that


MACH Acoustics worked on in partnership with Stride Treglown
Architects and Willmott Dixon.
The school incorporates natural ventilation through a vented
facade and openable windows, which cross ventilate classrooms
via a central chimney - saving money, building space and
simplifying the construction.

Cross Ventilation.

Noise Map.

One of the key benefits of the NAT Vent


Attenuator is its simple implementation of
cross ventilation through a corridor wall,
whilst still maintaining acoustic integrity. It
also enables cross ventilation to vertically
stacked rooms, vented through a single
stack.

An important stage in the acoustic design


of a building is an environmental noise
survey of the existing site, a service
provided by MACH Acoustics.

Requirement:
BB93
BB101
Key Products/Services:
Environmental Survey
Consultancy
NAT Vent Attenuator (NVA)
Partners:
Stride Treglown
Willmott Dixon
Awards:
BREEAM Very Good

The result is that vertically stacked spaces


no longer require independent chimneys
to maintain the acoustic separation
between rooms, resulting in a significant
recovery of floor area and considerable
cost savings.

Sustainable Acoustics
phone/fax 0117 944 1388
email info@machacoustics.com
www.machproducts.com

Using the data collected, a dynamic


noise map was constructed and used to
access the noise levels at each facade
and the resulting noise break-in within
the teaching spaces. It was clear that the
site was not particularly noisy and that
an open window would provide enough
attenuation at the facade facing away
from the roads - simple and low cost.

Bristol
Trelawney House, Surrey Street,

Bristol, BS2 8PS
London 11 Sandycombe Road, Richmondupon-Thames,
Surrey TW9 2EP

Design.

Result.

A testament to the NVAs versatility whilst maintaining


class leading acoustic performance, the build was
impressive architecturally whilst naturally ventilating
and meeting both BB93 and BB101 requirements as a
teaching space.
A ventilation strategy was developed in close coordination
with Stride Treglown Architects - using the sound map which efficiently attenuated noise on each facade.
On the noisy road facing facades, a cedar shingles
feature created a duct, with intake perpendicular to the
ground and containing the NVA. A 90deg arrangement
like this increases attenuation and minimises impact on
building space - highlighting the bespoke design options
that the NVA offers. The quieter rooms with central
chimney simply used openable acoustic windows.
The central chimney shown above is the highlight of the
natural ventilation project. Each stack of classrooms
featured a small sqaure chimney, which vented out
through natural vent towers on the roof of the building.
Details of the this are shown on the right.

Sustainable Acoustics
phone/fax 0117 944 1388
email info@machacoustics.com
www.machproducts.com

Bristol
Trelawney House, Surrey Street,

Bristol, BS2 8PS
London 11 Sandycombe Road, Richmondupon-Thames,
Surrey TW9 2EP

Thanks to a partnership between MACH Acoustics and


Strides, the building received a BREEAM Very Good
rating and was well received by parents, pupils and
residents of the area.

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