3M Renewable Energy Division Window Films for Commercial Buildings Window films – solution to increase energy efficiency Making Windows Work for You! Agnieszka Michalak, Business Development Supervisor Renewable Energy Division, Aerospace ad Aircraft Division

3M Renewable Energy Division A European Directive in the background The EU directive 2002/91/CE on energy performance of the buildings : a common framework intended to promote the improvement of the energy performance of the buildings in the European Union. Every member state has turned this directive into local laws supporting the energy savings in buildings and the carbon footprint reduction Portugal Greece France Décret n° du 19 mars 2007 UK….

3M Renewable Energy Division Where/why do we spend money on energy in Buildings? Source: US department of energy, EERE Cooling = n°3 after heating & lightening Commercial energy consumption depends on the building activity: 20% on shops, 15% in offices, 12% in education

3M Renewable Energy Division Heating and cooling costs The summer heat inside a building comes from –Outside / climate, sun rays, through walls, roofs and windows –Inside: lightening, electrical appliances, occupants The best way to use solar gain is to stop the heat before it has entered the house It costs 3 to 4 times more to COOL a building by 1°C than to HEAT a building. In most cases, passive cooling can be the most cost effective & green solution

3M Renewable Energy Division What are the options to reduce heat ? Prevent heat generation –Efficient & regulated lightening –New generation power appliances & devices –Reasonable number of occupants per buildings Prevent heat introduction –Roof insulation –Wall insulation –Windows insulation Active cooling: Air conditioning Passive cooling (mainly new buildings) Source: Source:

3M Renewable Energy Division Our Focus is on Enhancing Existing buildings! 3M Renewable Energy Division Source: US department of energy, EERE 85% of the buildings in 2050…already exists today !!! Source EU commission  Not always possible to change current material for more energy effective options: - huge costs to improve or replace - alteration work might need approvals & planning permissions - refurbishment might need building closure for several months The older the building, the costly in Energy

3M Renewable Energy Division What are the options to prevent from heat introduction through existing windows? –No more windows –shutters –Curtains –Blinds –Shading –Sun screens –Films Picture source: Microsoft Office

3M Renewable Energy Division Why do we have Windows? 1. To let light in. 2. To allow us to see out. 3. Ventilation. 4. Aesthetics  Options that don’t let the light enter the building or clearly see outside are conflicting Picture source: Microsoft Office

3M Renewable Energy Division How do Solar Control Films Work? The most typical construction is to have a very thin coating of metal applied to a thin polyester film with an optically clear and long lasting adhesive that bonds the film to the window, allowing the metal to reflect away the sun’s heat and allowing you to see out. The top window is allowing 87% of total solar energy into the building and with the film this can be reduced to 12%

3M Renewable Energy Division Window Films and Energy Saving Applying 3M films on your windows will: Reduce the heat inside your building Reduce the need for air conditioning prolonge HVAC life Reduce your energy bill Improve occupant comfort Improve people’s productivity increase profit

3M Renewable Energy Division How to measure the savings? Depending on the building - size & number of floors - size of the surface covered by glass or windows -Exposure & region -Number of occupants Depending on the windows -Number of panes -Type of glass Depending on the daily usage of the building -Number of electrical appliances in use -Yearly electricity bill -HVAC temperature Depending on The 3M Window film selected

3M Renewable Energy Division 3M tools to measure savings From basic Saving Calculator to sophisticated official Demand Analyzer from the Window film Industry

3M Renewable Energy Division Real Case Studies as examples w_Film/Solutions/Resources/Links/Case_Studies/

3M Renewable Energy Division