The contribution of energy efficient glass products to CO2 reduction in the EU

1
The contribution of energy efficient glass
products to CO2 reduction in the EU

• Bruno Carrel-Billiard

2
Overview

• The objectives of the EU and the current
  situation
• Two studies
• Low-E Insulating Glass for Energy Efficient
  Buildings
• Solar Control Glass for Greater Energy Efficiency
• Conclusion

3
Objectives of the EU and the current situation

• 20 of energy saving by the year 2020
• 380 million tonnes of oil equivalent.
• 790 million tonnes of CO2 emissions per year.
• Over 40 of all energy consumed in the EU is in
  buildings
• 300 million tonnes of needless CO2 emissions must
  be cut annually in residential and
  non-residential buildings.

4
Glass for Europe commissioned two studies

• Low-E Glass
• To reduce the energy demand in buildings
  (especially heating).
• Solar Control Glass
• To reduce the need for air-conditioning.

5
Study Low-E Insulating Glass for Energy
Efficient Buildings

• Glass for Europe commissioned the Dutch technical
  research institute TNO to perform a study on the
  benefits of Low-Emissivity glazing.

6
What is Low-E glass?

• Low-E Low-Emissivity
• Emissivity refers to the ability of the glass
  surface to reflect heat.

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How does Low-E Double Glazing work?
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How does Low-E Double Glazing work?
Transparent low-emissivity coating
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How does Low-E Triple Glazing work?
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How does Low-E Triple Glazing work?
Transparent low-emissivity coating
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Improvement in the thermal insulation of glazing
2 times better
5.8
6 times better
2.7
1.5
1.1
0.7 to 0.5
Low-E Triple glazing U value 0.7- 0.5
Single glazing
Ordinary double glazing
Low-E Double glazing U value 1.1
12
Improvement in the thermal insulation of glazing
Building stock 75 - 90
New and future buildings
5.8
2.7
1.5
1.1
0.7 to 0.5
Ordinary double glazing
Low-E Double glazing U value 1.1
Low-E Triple glazing U value 0.7- 0.5
Single glazing
Pre-1970
1970
2007
1985
2005
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A scientific determination of the potential
benefits of Low-E glass

• Potential energy savings and CO2 reduction in
  Europe from an increased use of Low-E insulating
  glazing

High performance insulating glazing
Building stock
residential and non-residential
New bulidings built between today and 2020
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A scientific determination of the potential
benefits of Low-E glass

• Hypothesis
• Energy Performance of Buildings Directive
• EN ISO 13790 2007
• 27 countries in the EU
• 8 climatic zones in Europe
• Nature of the building stock
• Construction and demolition rates
• Mix of energy sources in use
• etc

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A scientific determination of the potential
benefits of Low-E glass

• Determination of the energy savings is based on
  two sets of assumptions
• Glazing currently used in existing buildings or
  expected to be used in buildings built between
  2008-2020.
• Use of high-performance double or triple Low-E
  glazing used in these buildings (retrofitting and
  new-builds).

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Results annual energy and CO2 savings potential
in the EU27 by the year 2020

• If all Europes buildings were fitted with
  double-glazed Low-E glazing, Europe would save
• Up to 90 million tonnes of CO2 emissions
• annually by the year 2020.
• That is equal to 21 million tonnes of oil
  equivalent or the annual energy consumption of
  buildings for 19 million inhabitants!

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Results annual energy and CO2 savings potential
in the EU27 by the year 2020

• If, in addition, we use triple low-e glazing in
  new buildings (everywhere except in the South)
  and double glazing in existing buildings, Europe
  could save
• Up to 97 million tonnes of CO2 emissions
• (one third of the EUs emissions reduction
  targets for buildings).
• 95 of these savings comes from the retrofitting
  of the windows of the building stock.

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Study Solar Control Glass

• Glass for Europe commissioned the Dutch technical
  research institute TNO to perform a study on the
  benefits of Solar Control Glass in 2008.

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What is Solar Control glass?

• Solar Control Glass allows sunlight to pass
  through a window, while radiating and reflecting
  a large degree of the suns heat radiations.

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Solar energy 480 W/m²
Artificial light 200 W
100 W per person
1 computer printer ... 150W
21
Growth in demand for air-conditioning
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How does Solar Control Glazing work?
Transparent coating
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A scientific determination of the potential
benefits of Solar Control Glass

Potential impact on energy and CO2 saving
High performance solar control glass
Existing and new, non residential and residential
buildings
2
1

• New buildings solar control glass in all
  buildings with air-conditioning
• Building stock replacement with solar control
  glass in all existing air-conditioned buildings

• Same but
• assuming an increasing use of
  air-conditioning to the levels seen in the USA

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A scientific determination of the potential
benefits of Solar Control Glass
2
1

• New buildings solar control glass fitted in all
  buildings with air-conditioning
• Building stock replace windows with solar
  control glass in all air-conditioned buildings

• Same but
• assume an increase in use of air-conditioning to
  the levels seen in the USA

Potential of saving,
annually by 2020 16 million tonnes of
CO2 Around 5 of the EUs targets for the
building sector
Potential of saving,
annually by 2020 86 million tonnes of
CO2 Around 25 of the EUs targets for
the building sector
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Results annual energy and CO2 savings potential
in the EU27 by the year 2020

• Between 15 and 85 million tonnes of CO2 emissions
• could be saved with the use of Solar Control
  Glazing
• Thats between 5 and 25 of the EUs emissions
  reduction targets for the building sector!
• The biggest potential is in the Southern part of
  Europe
• 
  

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Conclusion

• The use of today's high-tech glass provides a
  win-win-win scenario
• Keeping building occupants comfortable and
  productive
• Reducing unnecessary CO2 emissions
• Reducing energy needs and cutting costs

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Conclusion

• These products already exist!
• Their use does not increase the cost of
  buildings.
• The use of advanced insulating glazing (Low-E
  and/or Solar Control Glazing)
• is an easy way to reduce unnecessary CO2
  emissions and to save energy.
• Policy-makers should actively examine ways to
  promote greater use of Low-E and Solar-Control
  insulating glazing
• ... especially for replacing inefficient windows
  in existing buildings.

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Thank you for your attention
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