Monodraught Windcathers Provide Natural Ventilation For New
London Office Development
 When
Workspace Group PLC, the leading provider of flexible business space
to SMEs in and around London, insisted on natural ventilation for
the new third floor offices at its Canterbury Court development,
award-winning building services engineers Brian Warwicker
Partnership proposed Monodraught Windcatchers, a solution based on
sustainability and intelligent design.
Canterbury Court is a 180-year-old building that has, in its distant
past, been used as accommodation for horse driven Hackney carriages.
Today, following refurbishment and an extension, this striking
modern development located within the Kennington Park Business
Centre, offers a combination of warehouse and office space with
industrial units located on the lower ground floor and offices
above. A new third floor, added as part of the refurbishment and
development project, provides additional office accommodation and
features a central atrium and roof garden.
The newly-built third floor was constructed in accordance with Parts
L2A and Part F of the Building Regulations and, as Kevin Horsfall of
Brian Warwicker Partnership explains, Workspace Group also insisted
that the offices had to be naturally ventilated in order to reduce
CO² emissions. Commenting on the specification, he says the depth of
the office space exceeded the 6.5 metre CIBSE criteria for
single-sided, naturally-ventilated accommodation, so a system of
roof mounted Monodraught Windcatcher units was proposed to provide
crossflow ventilation in each of the office spaces.
Designed to operate with virtually no moving parts, Monodraught
Windcatcher systems use established atmospheric principles and the
natural effects of the wind to bring fresh air into a building and
extract stale warm air, using only natural forces. Warm air rising
to roof level decreases the air pressure within buildings, allowing
cooler air to enter the building via the Windcatcher units. The
resultant change in air pressure produces sufficient airflow to make
the space comfortably fresh. Wind blowing onto the windward side of
a ventilation stack increases the through-put of air and encourages
stale and stagnant air to be extracted through the leeward side of
the roof unit.
The fifty-five Windcatcher units installed feature automatic dampers
that open and close to maintain comfortable internal temperatures.
The dampers themselves are equipped with individual controls to
prevent over-cooling in winter months and provide the occupants of
each room with a manual override facility. The units are designed to
accommodate an average heat gain of 35w/m² in the offices at a
minimum wind speed of 1.5 m/s, but will achieve greater gains with a
more normal wind speed of 3 m/s, resulting in a higher internal air
change rate. The cooling effect of the Windcatchers can be further
improved in the summer by opening the window lights or external
doors in each unit to increase the air change rate.
During winter months the Windcatchers also provide trickle
ventilation, supplementing the 5 l/s per person that trickle vents
typically offer, to ensure compliance with the new Part F minimum
requirement of 10 l/s per person.
Kevin Horsfall says the Windcatcher installation at Canterbury Court
not only meets Workspace’s brief but also reflects Brian Warwicker
Partnership’s view that the best of traditional and modern
technologies should be used to lower emissions and maximise comfort.
Summing up, he says: “Using natural ventilation with radiator
heating for the winter, with a central plant and a limited amount of
heat recovery, this ‘green’ building complies with all current
regulations without the need for mechanical cooling.”
Email:
info@monodraught.com
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