Window Insulation Film

Solar control film

It works by reflecting the Infrared Component of solar Energy (often 700W/sq M) and absorbing the UV Component. Some Films are also silver, or Tinted to reduce visible Light.

Typical absorption for a silver film is 65% to the visible and the Infrared with up to 99% of UV Rays. This Type of film sticks directly on the Glass.

Air control film

Typical Window Insulation film kit of Plastic Shrink tubing (bent), and a Roll of double-sided tape (see Wikihow, Installation Manual, d’)

This film is the Window frames in the double-sided Adhesive tape, pressure sensitive. The Effect is to create a double glazed system, with an Air Layer of about 0.5 Cm thick between the Film and the Glass. This limits the convection of Air effective to transfer Heat to the Inside of the surface of the Glass. The reduced Heat flow also can prevent the water of Condensation that triggers when the Temperature of the inner Surface below the Dew point is down. In the case of an outdoor Temperature of 0 ° C with a wind velocity 15mph and Temperature 20C condensation occurs with only 30% RH relative Humidity with a single glazed system Compared with 60% RH for a double glazed system. The condensation also provides an additional 2200 J/ml is significant.

The film is a Heat-shrink film that allows, Hair dryers are used to remove Wrinkles and improve the optical Clarity. Given that the thermal Conductivity of Air (0.024 W/mK) is much lower than Glass (0.96 W/mK) Heat flow by conduction could, in theory, reduce 97.5%, it is limited in Practice by slow Air movement in the Cell of convection between the Film and the Glass.

However, a typical Window Insulation film kit is not to prevent the Convection, except if the Frame is less than 1 Inch of Vitrification. The top Sash of a typical Double hung Window is 1-2 cm beyond the lower Wing, 2-3 cm behind the Window. It is too far to eliminate the Convection. In these Situations, the kits work thanks to the Reduction of infiltration is not by Convection, and to the inside of the ” storm of the Window.” The ideal Distance for 2 Sheets of Glazing is about .5-.75 Inches (see double glazing).

Applications

Solar control film is an effective Way to Control excessive Sunshine during the Summer Months.

Air control film is Often used in winter when the outgoing Heat flow is more important, especially for single-glazed, where the Temperature Difference is often sufficient for the water of Condensation.

See also

Shrink Film

References

^ Condensation on the inside of the Window Surfaces CANADIAN BUILDING DIGEST, Originally published April 1960, A. G. Wilson

^ Questions about windows and condensation National and the living room fenestration Rating Council

^ Strategies to Prevent Condensation in Buildings Eduardo de Oliveira Fernandes, Vtor Leal and Francisco Craveiro IDMEC and DEMEGI, Faculty of Engineering, University of Porto Porto

^ Condensation Potential Chart RLC Engineering, LLC.

^ Thermal conductivity of the Materials-Engineering toolbox

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