3M Renewable Energy Division

Window Films for Commercial Buildings

Window films – solution to increase energy efficiencyMaking 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 http://www.lisboaenova.org

Greece http://www.pomida.gr/loipa/energy-saving.html France Décret n°2007-363 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: www.smarterhomes.org.nz

Source: www.reliant.com

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

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

Demand Analyzer.lnk

3M Renewable Energy Division

Real Case Studies as examples

http://solutions.3m.com/wps/portal/3M/en_US/Window_Film/Solutions/Resources/Links/Case_Studies/

3M Renewable Energy Division