Passivent - MIXING THE OPTIONS IN FENLAND REGENERATION
 The
biggest development project in the Fens for centuries is
harnessing advanced design and technology to breathe new
life into a derelict area.
The central feature of the £47m Nene Waterfront
regeneration is the Boathouse and its adjacent Business
Space office building, which take inspiration from the
maritime location whilst aiming to fulfil ‘Best
Practice’ philosophy. As a result, sustainability has
been at the forefront of the design, including
incorporation into both buildings of Passivent ‘mixed
mode’ ventilation.
The Passivent system harnesses natural air movement
principles of convection (whereby warm air rises) to
effectively ventilate the buildings whilst giving a
significant reduction in CO2 emissions, and avoiding the
use of ozone depleting substances. Advanced control
equipment monitors the building’s air quality and
temperature constantly; should temperatures rise beyond
presets in exceptional circumstances (eg a spell of
unusually hot or cold weather), the system triggers a
Mitsubishi air conditioning system to supplement the
ventilation to restore ambient temperatures to
comfortable levels.
Will Lockwood, of project architects Feilden+Mawson,
elaborated, “The Boathouse project seeks to reflect best
practice in energy conservation and BREEAM standards,
including natural ventilation, rainwater harvesting,
high levels of natural daylight and orientation of the
buildings to control solar gain. It is hoped that with
the incorporation of Passivent louvres, air handling and
conditioning energy will be greatly reduced while also
providing the building users the benefits of a healthy
and pleasant working environment, offering an adaptive
and flexible solution to ensuring air quality is
maintained to a high standard in a manageable way.”
To achieve this, the focal point three-storey Boathouse-
providing a café, display space, yacht club, harbour
offices and conference space- includes a combination of
11 Passivent wall and window Aircool units, drawing
fresh air into the building, and extracting warm, ‘used’
air via the stairwell which dual-functions as a stack or
chimney to the Airstract roof terminal. The adjacent,
two-storey Business Space incorporates 30 Passivent wall
Aircool units to again draw fresh air in at low level.
The cooler external air ‘pushes’ the warm, internal air
through acoustic transfer units to be exhausted through
high level wall Aircool ventilators.
The entire system is fitted with modulating actuators
which help to effectively control the ventilation flow
as dictated by the central Passivent/Mitsubishi mixed
mode controller, to ensure air quality and temperature
is maintained 24/7, without draughts.
Research by Brunel University showed the Passivent mixed
mode system reduces energy consumption of a building by
over 40% compared to conventional air conditioning
alone.
Passivent is part of the Building Product Design Group
and is the UK’s leading designer and supplier of natural
ventilation systems for both domestic and commercial
applications. The company is a founder member of the
NatVent EC-EU-funded project co-ordinated by the
Building Research establishment to develop practical
natural ventilation solutions for the commercial sector,
and has also contributed to the BISRIA Guide BG2/2005
Wind Driven Natural Ventilation Systems, as well as
being a member of the DfES steering committee on natural
ventilation guidance for schools, Building Bulletin 101.
Email:
afpr@btconnect.com
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