Energy Efficiency and Carbon Reduction

The story of energy efficiency and Hanita window film begins with the source of our excess solar energy – the sun – in a conditioned air space.  As shown below, window film can effect solar radiation in three major regions of the electromagnetic spectrum: Ultraviolet (UV) wavelengths, Visible wavelengths, and Infrared (IR) wavelengths.

Components of Solar Radiation

Of these three regions in the electromagnetic spectrum, both UV and IR are invisible.  In addition, as shown below, the wavelength band included in each region is not the same width.   The UV band is relatively narrow (about 0.2 microns) and the visible band slightly larger (about 0.3 microns) whereas the IR band is an order of magnitude larger.
Also shown on Figure 8 is the relative proportion of solar energy present in each band – 5%, 46%, and 49%, respectively.

Solar Spectrum and Energy

Lastly, shown below you will see the result of applying an example Hanita film to conventional 6mm glass:

• Total solar reflection is increased from 7% to 52% showing that excess solar heat gain is reflected rather than absorbed by the glass, and
• Total solar transmission is decreased from 84% to 14% showing excess solar heat gain never enters the building

Hanita Window Film Performance

It is this reduction in excess solar heat gain that accounts for a lesser cooling load.  The reduced cooling load accounts for energy and carbon savings.

Please see section above regarding energy modeling as climate, installation costs, and film performance can each affect the desired result.