Heat transfer through a laminated glass with a film interlayer

摘要

A transient one-dimensional mathematical model enabling the prediction of the thermal performance of a laminated glazing having a film coating,with an experimental verification is presented.A regular laminated glass is composed of two 3 mm glasses with a polymer layer between them.For the experimental verification,a Cu_xS thin film solar control coating was applied between the polymer layer and the inner surface of the exterior glass.A constant normal incidence of air mass 2 solar radiation was assumed. Conductive heat transfer within the glasses and convective and radiative heat transfer to the interior and exterior is considered.Using the optical properties of the glasses,polymer,and solar control coating,the redistribution of the absorbed component of the solar radiation and the shading coefficient is calculated.Comparison between the performance of the arrays with and without film coating is presented.The shading coefficient as a function of the film absoptance in the range of 0.37-0.62 for different reflectances from 0.08 to 0.30 are shown for arrays of 3 mm glasses with a 1 mm thick polymer in between.