DEN HELDER MEETING

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• DEN HELDER MEETING
• MAY 13-14th 2007
• WP10 CO2 BUILDING STOCK BUDGETING

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Presentation

• We have prepared a presentation with 84 slides
  for dissemination more details
• We will show a summarized presentation

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Complex realistic case

• We can considerate that the refurbishment /
  extension of the CHEVROLLIER high school has a
  success on life cycle period of 20 years if
• GHG emission during 20 years of the old building
  (see next slide column 1)
• GHG emission during the works period (see next
  slide column 2)
• will be inferior of the extended refurbishment/
  building during 20 years

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CO2 Building Stock Budgeting Application
Reduction of GHG emissions
Building Construction
GHG Total emissions of a building non-refurbished
during 20 years
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2
Building Refurbishment
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Complex realistic case

• Column 2 is the some of
• GHG emission during the exploitation of
• New buildings
• Retrofit buildings
• GHG emission for preparation and pull down a part
  of the existing building
• GHG emissions due to materials transportation and
  company personal workers vehicles
• GHG emissions due to components manufacturing
• GHG emission due refurbishment works en erection
  of the new buildings

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Building sector GHG emission a complex case

• The goal of the study is to determinate the pound
  of each part
• It will be also a try to approach the complexity
  of the GHG emission in the building sector
• Perhaps, solution advocated in building sector is
  not sufficient because previous analysis is too
  simple

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GHG emissions during Chevrollier works

• Period
• April 2003
• December 2006

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Transport

• Five sectors
• Personal vehicle
• Company vehicle
• Building site engines
• Transport of materials
• Transport of waste

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Comparison per sectors (for all lots) in2005
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GHG emissions - 2nd semester 2006
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• Global Balance

• September 2003
• December 2006

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Total GHG emissions 4030 tonne equivalent CO2
Embodied energy 3438 tonne equivalent CO2
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Total Emission per lot 2003 / December 2006
Lot one divers access network Lot two
electricity Lot three heating / ventilation /
plumbing Lot four all other works.
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GHG emission by sector
86 of the GHG emission is due to fabrication
components
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GHG emission per material type
Cement and Steel ? 76,2 of the total emission
(mainly in new buildings !) Insulating ? 13.1
Aluminium ? 0.8 this result seems very low !
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• Numerical Results

• Now, we can transmit the numerical results of
  materials emissions to help the WP-9 works package

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• Global Emission

• Par semester
• Combination

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GHG emissions
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Prediction of GHG emissions
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Analysis (1)

• We note a reduction of GHG emission during the
  second 2006 semester. For explanation
• Firms complete with less precision the files
• Mainly retrofit works on building L (insulation /
  no use of a big quantity of cement or steel
  during this period)
• Cement and steel are the two main responsible
  materials of GHG emission

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Analysis (2)

• A perfect collect of data will consist to
  separate GHG emission due to
• Building pull down
• Retrofit works
• New buildings

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GHG emission conclusion

• The analysis of all data collected shows than
  total emission GHG, during the building retrofit
  and extension, will be superior than
• 5 000 tonne equivalent CO2, probably 5 500
  tonne equivalent CO2
• 62 of this emission is due to the use of cement
  and steel !!!

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Comparison between GHG emissions

• GHG emission during the building retrofit and
  extension
• GHG emission during one year by the CHEVROLLIER
  high school before retrofit

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Chevrollier high school
Energy consumption and GHG emission before
retrofit and extension (average)

• Please note we have taken the EU ratio as
  discuss during the FIRENZE meeting

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Comparison between GHG emissions for each period
tonne eq.CO2
956 average GHG annual emissions (heating /
lighting / hot sanitary water / ) before
refurbishment and extension
5438 Total GHG emissions predicted (from 2003 to
the end of the works)
3850 Total GHG emissions from 2003 to 1st
semester 2006
Refurbished building and extension
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Analyse (1)

• The total GHG emission due to the retrofit and
  the extension of the Chevrollier high school is
  equivalent to the GHG emission, before retrofit
  and extension, during 5 years!

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Analyse (2)

• The previous result is a surprising result for
  people who has known the building before retrofit
  (a building with a high level of consumption)
• The consequence of this analysis must be analyzed
  carefully
• We will develop this work during the next year

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Analyse (3)

• We hope that this non-typical approach can help
  deciders to choose the most efficient way for
  global reduction emission of GHG in the building
  sector

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• THANKS FOR YOUR ATTENTION