Monodraught CPD Presentation

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The Benefit of Windcatchers
• Minimising the
entrapment of pollution
• Improving indoor air
quality
• Minimising noise
transmission
• Reducing the impact of
“heat islands”
• Reducing CO2 emissions,
carbon footprint and,
energy costs
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Types of Natural Ventilation
Diagrams reproduced from Building Bulletin 101
with kind permission of the DfEE
• Single Sided Ventilation
•
i.e. Openable windows
• Cross Flow Ventilation
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i.e. High and Low level louvres
• Stack Ventilation
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i.e. Passive stack turrets
• Top down Ventilation
•
i.e. Windcatcher systems
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Wind Tower Principles
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Operation
Construction
Cooling
Still used today!
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Windcatcher Principles
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1 Wind movement
2 Air intake
3 Positive pressure
4 Cooler air
5 Low pressure
6 Natural buoyancy
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Day Time Operation
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Night Time Operation
and Night Time Cooling
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Designing Natural Ventilation
Natural Ventilation Proposals
1 Project Brief
2 Data used in calculations
3 Fresh Air Requirements
4 Heat Gain calculations
5 Predicted Ventilation Rates
6 Conclusions
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Control of natural ventilation
• Manual Control
• Semi-Intelligent
Control
• Fully Intelligent
Controls
• Seasonal settings
• User override facilities
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Educational Acoustic Standards
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Acoustic Standards for Educational
rooms detailed within BB93
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Ventilation design is held within BB101
•
The Minimum Fresh Air Supply Rate of
3 l/s per person, should achieve the
acoustic performance standards in
Table 1.1 of BB93.
•
When the Design Capability Supply
Rate of 8 l/s per person is provided by
natural ventilation, an additional 5 dB
is allowed in addition to BB93 levels.
•
All mechanical ventilation must meet
the indoor ambient levels of BB93
regardless of 3 or 8l/s per person.
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Acoustic Consideration
It was shown that for a typical classroom served by 1N° GRP 800 square Windcatcher
system (or equivalent rectangle of similar cross sectional area), a 15dB reduction in noise
transfer was achieved with an unlined system, (test 9). With the addition of 25mm of
insulation (test 11) the reduction increased by 11dB to 26dB.
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Case Study 1
Addey & Stanhope School, London
•Bespoke design
to suit building
style
•Acoustically
treated to prevent
traffic noise
•Highest point of
the roof away from
traffic pollution,
dust & dirt
•Engineered to
suit roof design
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Case Study 1
Addey & Stanhope School, London
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Case Study 1
Addey & Stanhope School, London
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The next generation -
Monodraught Sola-Boost systems
• Natural ventilation
with solar boosted
ventilation
• Higher levels of
sunlight gives greater
levels of ventilation
• Winner of the 2006
Interbuild product
awards for “Best
Building Services
Product”
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Incorporating Windcatcher systems
into the Architectural design
Blessed Thomas
School, Lancashire
Marlow Library
Bridgeport University
Audley Junior School
Peckham Academy, London
The
Press Office,
Howden,
East Yorks
Middleton
School,
Milton Keynes
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South Fields
School,
Surrey
Old Hill
Primary
School
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Case Study 2
Sands End Community Centre
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Case Study 3
East Midlands Airport
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