Introduction to Integrated Design of LowEnergy Buildings

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Introduction to Integrated Design of Low-Energy
Buildings

• Professor Svend Svendsen
• Department of Civil Engineering
• Technical University of Denmark
• ss_at_byg.dtu.dk, www.byg.dtu.dk

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Integrated Design of BuildingsContent

• What is that?
• Why and why now?
• Benefits
• How

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Integrated Design of BuildingsWhat is that?

• Objects
• Building Envelope and Technical building systems
  
• Performances
• Building services (indoor environment) and energy
  use
• Economy
• Earnings over the life cycle of the building
• Optimization
• Maximization of life cycle earnings

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Integrated Design of BuildingsObjects

• Building geometry, envelope and structures
• Shape and orientation of building
• Walls, base floor, roof
• Windows, curtain walls
• Solar shading and daylight control devices
• Interior walls, decks, structures

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Integrated Design of BuildingsObjects

• Technical Building Systems (HVAC)
• Ventilation system
• Heating system
• Cooling system
• Lighting system
• Domestic hot water system
• ...

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Integrated Design of BuildingsPerformances

• Building Services
• Indoor environment
• Thermal comfort
• Atmospheric comfort
• Visual comfort (dayligth, view)
• Acoustic
• Transport
• Horizontal, Vertical (lifts)
• Etc.

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Integrated Design of BuildingsPerformances

• Energy use
• Ventilation (fans, controls)
• Heating (of rooms)
• Cooling
• Lighting
• Domestic hot water
• Equipment (optional in EPBD-standards)
• ( EPBD Energy Performance of Buildings
  Directive)

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Integrated Design of BuildingsEconomy

• Earnings over life cycle of building
• All income
• Payment for space in building
• Payment for building services
• All expenses
• Initial cost / Capital cost
• Operating cost (energy, cleaning, maintenance)

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Integrated Design of BuildingsOptimization

• Maximization of life cycle earnings
• Main uncertainties
• Future cost of energy
• Payment for space and building services
• Solutions
• Scenarie analysis,
• Risk analysis

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Integrated Design of BuildingsWhy and why now?

• Because the society needs
• sustainable development low-energy buildings
• improved indoor environment
• improved productivity in the building industry
• Because total energy is introduced now in
• the EU-directive on energy performance of
  buildings
• national building codes

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Integrated Design of BuildingsEPBD EU-directive
on Energy Performance of Buildings

• Energy performance based on total energy
  delivered to the building except equipment
• Total energy requirements in natl. building codes
• EPBD implemented 2006
• Energy requirements revised every 5 year
• Energy requirements as strong as possible only
  limited by the technology and the economy

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Integrated Design of BuildingsTotal energy -
Effect on design

• The energy performance is influenced by
• Building geometry
• Building (Window) orientation
• Thermal optical data of building parts
• Type and data of technical building systems
• Ventilation, heating, cooling, dhw-system
• Use and operation of building

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Integrated Design of BuildingsTotal energy -
Effect on design

• Optimization of design of building
• Energy performance as required
• Indoor environment as required
• Total economy optimized

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Integrated Design of BuildingsBenefits

• Integrated design proces benefits
• Easier to fulfill requirements to indoor
  environment and energy use
• Better possibilities for optimization of total
  economy of building
• A possibility for the building sector to improve
  performance and productivity

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Integrated Design of BuildingsHow

• Listing of the functional requirements of
  buildings
• Preparation of space of solutions
• Generating design proposals
• Optimization analyses and decision pro-cesses.

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Integrated Design of BuildingsHow Focus areas

• Aims of the Integrated Design Process
• Stimulate cooperation
• The engineer have to perform parameter analysis
  and set up a wide space of possible solutions as
  input to the architectural design
• Make the process efficient
• Avoid iterations outside the solution space.