Department of Defence Newbridge

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Department of DefenceNewbridge

• Experience of Designing a Building Using
  Simulation Tools
• A Case Study
• Department of Defence Decentralised Offices
• 28th Nov 2008
• Jay Stuart
• DW EcoCo
• Integrated Sustainable Design Consultants

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Department of DefenceNewbridge site

• The final design now under construction

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Department of DefenceNewbridge site

• IES for dynamic thermal simulation of whole
  building
• Ecotect for solar shading analysis
• Therm for thermal bridging analysis

Shading Analysis
Simulations for Value Engineering
3D thermal bridging simulations
Shading with trees
Thermal simulation
CFD simulation
Simulation work
Drawings from architects
Simple advice on shading Ventilation strategy
Timeline
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Department of DefenceNewbridge site

• Natural Ventilation Required by OPW

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Department of DefenceNewbridge site

• Competition stage simulation work
• (no shading, no atrium in the design)

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Department of DefenceNewbridge site

• Competition stage (no shading, no atrium)

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Department of DefenceNewbridge site

• Simple preliminary advice on shading options to
  the architects

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Department of DefenceNewbridge site

• Ventilation for simulation

• Design guidelines provided to the architect for
• Natural Ventilation strategy
• Plan depth
• Atrium design
• Window design
• Solar shading
• U-values

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Department of DefenceNewbridge site

• Competition Stage

Energy Use Summary 138 kWh/m2/yr
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Department of DefenceNewbridge site

• CFD Simulation to SW corner office

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Department of DefenceNewbridge site

• The final design

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Department of DefenceNewbridge site

• The final design

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Department of DefenceNewbridge site

• Simulation work detail design simulation model

• Changed layout
• Solar shading
• Atrium considered for natural ventilation

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Department of DefenceNewbridge site

• The atrium final design

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Department of DefenceNewbridge site

• Simulation work

• Solar shading with trees TRANSFORMATION of an
  idea (considering information available and
  software capabilities)

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Department of DefenceNewbridge site

• Simulation work detail design simulation model

• Solar shading
• Atrium

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Department of DefenceNewbridge site

• Simulation work detail design simulation model

• Solar shading
• Atrium

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Department of DefenceNewbridge site

• Results
• (after several iterations and discussions with
  services engineers)

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Department of DefenceNewbridge site

• Results
• the energy breakdown

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Department of DefenceNewbridge site

• Thermal Comfort

• OPW Brief Internal temperatures are not to
  exceed 26C for more than 5 of the occupied
  hours and are not to exceed 27C at any time
  during the year.
• Measures
• Natural ventilation system
• An atrium to remove heat from the building and
  reduce temperatures in areas on the ground floor
• Solar control glazing to minimise solar gains
• Solar shading through brise soleil, overhangs,
  recessed fenestration and foliage

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Department of DefenceNewbridge site

• Simulation work for OPW

• Thermal Comfort

Mean Radiant Temperature for the office of the
Minister of Defence
( local cooling required )
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Department of DefenceNewbridge site

• Solar shading detail design

• The Ecotect model

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Department of DefenceNewbridge site

• Solar shading detail design

• Refining the design with Ecotect

• Original design

• Refined Design

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Department of DefenceNewbridge site

• 3D Thermal Bridging Calculation

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Department of DefenceNewbridge site

• 3D Thermal Bridging Calculation

• Isotherms in external wall, caused by steel
  fixings
• Cold bridging is often not considered in U-value
  calculations
• Therm software

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Department of DefenceNewbridge site

• 3D Thermal Bridging Calculation

• U-value vs. insulation thickness

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Department of DefenceNewbridge site

• 3D Thermal Bridging Calculation

• U-value vs.
• density of cladding fixings

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Department of DefenceNewbridge site

• Simulation for Value Engineering

• Client requested following changes for value
  engineering
• Change U-value from 0.2 to 0.27 W/m2K
• Reduce lighting controls to a basic specification

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Department of DefenceNewbridge site

• Simulation for Value Engineering

• Previous model used variables changed one at a
  time

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Department of DefenceNewbridge site

• Simulation for Value Engineering

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Department of DefenceNewbridge site

• P.Elliott and Co. Ltd.
• MOLA Architects
• WYG Engineers
• . 28th November 2008 . work continues.

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Department of DefenceNewbridge site
Thank You

• DW EcoCo Ltd.
• Integrated Sustainable Design Consultants