bahrain world trade center integrated wind turbines · reilabiltiy and maintanability operability...
TRANSCRIPT
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Bahrain World Trade Center
Integrated Wind Turbines
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Richard F Smith
Technical Director Middle East
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1. Bahrain World Trade Center
2. Integrating design to produce sustainable solutions
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1. Bahrain World Trade Center
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Bahrain World Trade Centre
The First Large Scale Integration of Wind Turbines in a Building
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Bahrain World Trade Centre
1.2. The Concept Design
generators and site analysis3. Wind dynamics on the Towers 4. The Design Process5. Environmental responses6. Engineering solutions7. The Turbines and the Bridges8. Energy Yield9. Progress images
Content:
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Bahrain World Trade Centre
In November 2002 Atkins was asked to master plan a site in Manama, Bahrain with an existing 12 st Sheraton Hotel, shopping centre, 16 st office building and unused garden.
the airport
the site
The Site and the client brief:
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Bahrain World Trade Centre
The Site and the client brief:
The Brief:
In November 2002 Atkins was asked to master plan a site with an existing 12 st Sheraton Hotel, shopping centre, 16 st office building and unused garden.
Shopping Centre
Office Building
The Site
The Site and the client brief:
Bahrain World Trade Centre
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Bahrain World Trade Centre
The Site and the client brief:
The Brief:
In November 2002 Atkins was asked to master plan a site with an existing 12 st Sheraton Hotel, shopping centre, 16 st office building and unused garden.
Multi storey car parking
Prevailing onshore
breeze
The Site analysis & Concept generators:
Bahrain World Trade Centre
New
Shopping Mall
Grade parking & Future Hotel
Sheraton Hotel
Existing Mall
Exiting Office
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Bahrain Wind Climate:
Bahrain Wind Rose
Micro onshore sea breeze
Bahrain World Trade Centre
Bahrain and Saudi Arabian land masses heats up during the early hours of the morning, creating uplift and cool sea breeze replaces it resulting in a consistent onshore sea breeze.
The Sea breeze effect creates a consistent North Westerly onshore breeze .
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Conceptual inspirations for the towers:
Nautical expressions of Sails to carve the onshore breeze,
the towers inspired the shape in plan and elevation of the towers
Arabian Wind Towers
Traditional to Modern
Sails
Plan
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Types of Turbines:
Horizontal axis turbines
Initial Turbine Research:TypePros and Cons of eachSize and appropriatenessConstraintsCosts and Cost/kWFeasibility & economicsManufacturers and willingnessPossible R&D and expertise
Harnessing Wind Energy in 21st Century
Vertical axis wind turbines
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First Concept Sketches: Master Plan
First wind study ideas
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First Concept Sketches:
First Massing sketch with turbine integration
The towers were originally designed at 300m and with three 50m turbines
However, to reduce Built up Area, we reduced the building to 240m high and included three 30m turbines to balance the proportion
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Getting the Balance Right when integrating wind turbines into buildings
investment - vs - benefit analysisFor clients to accurately understand the total costs, extra structural costs, R&D costs, maintenance costs, risks, power gains, rental gains, social gains
Investments are high and unviable if :Special turbines are designed where large R&D costs are involved (eg New York Stadium)Building form includes excessive and expensive structures to accommodate and support the turbines (eg. Freedom Tower, a number of research projects, however the BWTC structure and turbines are 3% of the construction costs)Constraints of turbines are not fully understood by the design team: wind shear, wind movement, risks, noise, flicker. (eg numerous projects)
Therefore key design objective were:Deploy standard or near standard turbine technologies using type rated turbines (little R&D, Insurances)Keep structure simple but design to provide aerodynamic advantages, and full understand the turbine constrains before conceptualising the project
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Micro Wind Climate on the building: BWTC Wind Dynamics:
Wind direction 315(perpendicular to the turbines)
Wind tunnel modeling and CFD modeling taken at the
uppermost turbine
The wind increases from 12m/s to about 22m/s
between the towers
The elliptical plan forms and sail-shape profiles of the towers act as aerofoils, funnelling the onshore breeze between them as well as creating a negative pressure behind, thus accelerating the wind velocity between the two towers.
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Micro Wind Climate on the building: BWTC Wind Dynamics:
Wind tunnel testing confirmed how the shapes and spatial relationship of the towers sculpt the airflow,
whereby the centre of the wind stream remains nearly perpendicular to the turbine within a 45 wind azimuth, either side of the central axis.
potential to generate power over a wider range of wind directions which increase their operational period in producing power.
Wind tunnel modeling CFD modeling
taken at the uppermost turbine
Wind direction 15(60 off perpendicular)
streamline
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Micro Wind Climate on the building: BWTC Wind Dynamics:
160m
110m
60m
Vertically, the sculpting of the towers is also a function of airflow dynamics. As they taper upwards, their aerofoil sections reduce. This effect when combined with the increasing velocity of the onshore breeze at increasing heights, creates a near equal regime of wind velocity on each of the three turbines. Our understanding and utilisation of this phenomenon has been one of the key factors that has allowed the practical integration of wind turbine generators in a commercial building design. This deduced R&D cost to type rated turbines and made the difference to insurances and risk analysis, and each turbine producing similar energy yields
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Creation of the built form: Tower Floor Plans
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Passive Design :
Aside from the wind turbines, the project includes a number of other environmentally responsive design features that reduce carbon emissions:
Buffer spaces between the external environment and air conditioned spaces: examples include a car park deck above and to the southern side of the entire shopping mall which will reduce sol air temperature and reduce conductive solar gain on the air conditioned spaces
Architectural orientated features:
Deep gravel roofs to provide kinetic insulation;Shading to external glass facades;- Balconies to the sloping elevations with overhangs to provide shading- Louvres to glazing- High performance solar glass is used with low shading co-efficient to minimisesolar gains where shading is not provided to glazingOpenable windows to allow mixed mode operation in winter months with air low leakageEnhanced thermal insulation for opaque fabric elements;Extensive planting and external water features to cool entrances areas and grade parking areasAnd socially, making the world more conscious of environmental design and renewable energy initiatives of buildings throughout the world
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Engineering the Solution
Bahrain World Trade Centre
Atkins, Science & Technology, UK Validation & Review
Ramboll Danmark A/S Consultants
Norwin A/S Turbine Manufactures
Elsam Engineering A/S Power Generation
BMT Wind Tunnel Testing
PMK - Acoustics
Atkins, Middle East
(Architecture, Structural, Building Services, Infrastructure, Project Management and Site Supervision)
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Environmentally Responsible Design - Engineering
Bahrain World Trade Centre
Dense concrete core and floor slabs presented to the internal environment;
Variable volume chilled water pumping;
Low pressure loss distribution for primary air and water transport systems;
Total heat energy recovery heat wheels;
Energy efficient, high efficacy, high frequency fluorescent lighting.
Dual drainage systems;
Connection to the district cooling system;
Dual flush WC and electronic taps with excess water flow restrictors;
Reflection pools at building entrances to provide local evaporative cooling;
Solar powered road and amenity lighting.
Intelligent BMS
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Wind Turbine Components
Bahrain World Trade Centre
Nacelle
Rotor
Bridge
Control, Monitoring and Safety System
Electrical Interface with Building
Nacelle
Rotor
Bridge
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Nacelle
Bahrain World Trade Centre
Cowling
Gearbox
Generator
Cooling System
Associated Controls
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Rotor
Bahrain World Trade Centre
29 m diameter
Composite construction
Max wind speed = 80m/s
Cut in wind speed = 4 m/s
Cut out wind speed = 20 m/s
Max rotational speed = 38 rpm (207 km/h tip speed)
Power limiting method is by stall
Approach Azimuth = 285 to 345
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Bridges
Bahrain World Trade Centre
Span = 31.7m
Tower movement = 500mm relative
Nacelle / rotor weight = 11 tonne
Bridge plan is V shaped to allow blade flex without strike
Engineered to withstand vibration without transmission to the building
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Safety and Fail Safe Items
Bahrain World Trade Centre
Robust physical design
Blade stall concept is intrinsically safe
Mechanical over-ride stand-still system
Extensive conventional control systems
Supplemental control systems for application
Blade deflection laser measurement system.
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Control and Monitoring Systems
Bahrain World Trade Centre
WTCS
EWTMS
IBMS
Wind Turbine Control System
Extended Wind Turbine Monitoring System
Integrated Building Management System
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Electrical Interface with Building
Bahrain World Trade Centre
400V asynchronous 225kW generators
Connected to LV side of transformer sub-station
Run in parallel with the electricity supply authorities supply
Export not allowed, so reverse current protection provided
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Design through SARM
Bahrain World Trade Centre
Safety, Availability, Reliability, Maintainability analysisRemote sensor viabilityPower outage impactElectricity board acceptanceCooling system availabilityMaintenance viabilityRain water thrown off bladesExciting vibrationsBridge resonant frequencyConstruction tolerance v- bridgeresonant frequencyBridge vortex sheddingSource / sink coincidenceBMS reliabilityLightening strikeBlade loss Tip break offBlade penetrationBlade / bridge strikeBlade fallClimate Sand ingress
Bird strikeTurbine operation outside of azimuth rangeAvailabilityReilabiltiy and maintanabilityOperability and durabilityPrevious performance of proposedturbineProject specific operating and controlstrategyUnusual flow and fatigue lifeDirt build up on bladesGalloping vibration at standstillMaximum twisting moment for a bladeNoise emitted from blades / generatorShadow flickerReflection of blades through windowsElectromagnetic interferance.Electrical flickerElectrical harmonics
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Turbine # 1 340 to 400 MWh/year
Turbine # 2 360 to 430 MWh/year
Turbine # 3 400 to 470 MWh/year
Total 1,100 to 1,300 MWh/year
Energy and Power Yield
Bahrain World Trade Centre
Fuel Type Equivalent Carbon Emission
UK basis 55,000 kgC p.a.
11 to 15% of electricity used by building
However, this is a conservative estimate as turbines have never been placed at this height and between two towers before.
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Turbines in production:
Turbines and bridges are being lifted into place now
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March 2007
Bahrain World Trade Centre
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2. Finding ways to design in a more sustainable way
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Cornerstones of Built Environment Design
Environmental
Economic
Social
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Eeconomic
Cornerstones of Built Environment Design
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Environmental
Social
Economic
Cornerstones of Built Environment Design
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Economic
Cornerstones of Built Environment Design
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1.Awareness Raising
2.Back to School
3.Research and Development
4.Working together more effectively
HOW?
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Surely, we can take it a bit warmer
Ice melts
Sea level rise
More disease
Ground dries
Plant / animal migration & extinction
Extreme weather events
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Is Climate Change True?
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What is happening?
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Carbon Wedge
GAS
OIL
2000 2050year
14 GtC
7 GtC
0
Renewables
Coal to Gas
Efficiency
CCS
Nuclear
Natural Sinks
COAL
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How are we doing at the moment?
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Passive Design
Orientation and massing
Shading and overshadowing
Construction materials
Microclimates
So what are we doing to improve the design of the built environment?
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Passive Design
Better EngineeringDistrict wide systems / Infrastructure
Efficient mechanical systems
Efficient electrical systems
Multiple uses
Lower transport power
Different energy conversion
So what are we doing to improve the design of the built environment?
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So what are we doing to improve the design of the built environment?
Passive Design
Better Engineering
Recovery StrategiesEnergy
Process integrated water
Waste product
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Passive Design
Better Engineering
Recovery Strategies
Renewables
Photovoltaic panels
Solar air conditioning
Wind turbines
Biomass
So what are we doing to improve the design of the built environment?
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Shading / Solar Access
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Daylight and Glare
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Airflow Analysis
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Energy Modelling
00:00 06:00 12:00 18:00 00:00
200000
150000
100000
50000
0
-50000
-100000
-150000
-200000
-250000
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
Date: Mon 14/Jun
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Basic Values - Social
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Economic
Cornerstones of Urban Design
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Thank you
richard.f.smith @atkinsglobal.com
www. atkins-me.com
www. atkinsglobal.com