Double Silver Low-E glass, mainly in the glass surface using magnetron sputtering deposition of multi-layer membrane, in the multi-layer film deposition of materials over a two-tier silver substrate made of high-performance glass products. Figure 4 for the different structures of the solar spectrum through the curve of the glass. Double Silver Low-E film is a principle of heat-reflective film with high visible light transmittance, high infrared reflectivity, the kinds of double silver layer covering the double silver Low-E Low-E coated glass can be more than 98% The far-infrared thermal radiation reflected back, make the glass emissivity E values from 0.84 down to 0.15 below and above, its shading coefficient SC may be required based on the engineering changes between 0.2 to 0.7. Based on the test simulations comparing Low-E coated glass line in the winter than in pairs of silver Low-E glass, an increase of about 40% of heat loss; relative in the summer than the dual-line Low-E coated glass silver Low-E coated glass increased by 20% of the heat through, Table 1 reflects the different structures of glass products for the comparison of heat transfer barrier, one can see double silver Low-E coated glass insulation for the best.
My GB/T18915.2-2002 "Coated Glass Part II: Low-E coated glass" standard set forth in the emissivity (E) the requirements of less than 0.15, which is common coated glass can not be achieved, while the Double Silver Low-E coated glass with low shading coefficient and high visible light transmittance, with a very low E values and U values to meet the request.
