Discussion of Heat Mirror Film:Performance,Production Process,and Cost Estimates.

摘要

Intrex film is a unique,transparent,electrically conductive plastic film originally developed as a component in electrically heatable,transparent products such as de-icing windshields for aircraft,locomotives,and the like. The electrical conductivity is imparted to the plastic film by the vacuum deposition of a thin film of gold onto one surface. This gold film exhibits typical luminous transmittance of 80% and sheet resistivity of 10ohms per square. The free electron concentration in the gold film that permits such high electrical conductivity is also responsible for very high reflectance and low emittance of electromagnetic radiation in the near and middle infrared spectral regions. For this reason,the Intrex film can be regarded as a ''heat mirror''with possible application as a glazing cover interior to a conventional window where it serves to reflect low temperature,long wavelength radiation back into the interior of the heated space or prevent its radiation outward. Since the chief utility of such a heat mirror film is during the heating season, a high luminous transmittance,or more precisely a high solar transmittance,is essential to ensure the benefits of solar heat gain. The properties,heat mirror performance,production and cost of Intrex film for window coating were studied. Intrex film was found to have optical properties which make it suitable for heat mirror window applications when used as the interior component of double layer glazing. The cost of the film in various quantities has been demonstrated to be low enough to make such heat mirrors economical. Possible modifications of Intrex films to improve heat mirror performance are discussed. Several alternate approaches for lower cost heat mirror windows are explored,including other metals,semiconducting oxides and multilayer polymers. Abrasion-corrosion resistant coatings for Intrex and their effect on heat mirror performance are also discussed. (ERA citation 03:044925)