Textured solar glass is the material of solar photo-thermal & photoelectric conversion system, of which industrialization fundamentally promotes the production scale of world photovoltaic industry to expand continuously. According to statistics, in 2007, the actual output of textured solar glass in China was only 60% of the total demand, so there is a large gap in the domestic market, and with the rapid growth of the photovoltaic industry, the market gap will be further expanded.
Each 1-megawatt solar cell device require 15,000 square meters of textured solar glass, 3,000 MW solar cell device require 45,000,000 square meters of photovoltaic glass per year all over the world , and the annual growth rate is 40%, meanwhile, the greater demands to textured solar glass are new type of thin-film solar cells, textured solar glass plate is plated with nano-thin photovoltaic film after plating it with a transparent conductive film ,then become thin film solar cell components.
Because of needless of silicon materials, the cost of thin film solar cell is much less than polysilicon Solar cells, and can be the external glass wall of buildings , which get the purpose for lighting and generating , and the annual growth rate is not less than 80% .As the support of thin-film solar cell, the demands to textured solar glass are up to 100 million sqm each year in the world.
At present, the mainstream of textured solar glass is tempered textured solar glass with the thickness of 3.2mm, in the wavelength range of spectral response of solar cells (320 ~ 1100nm), light transmission rate is up to 91%. For the infrared light that its wavelength is more than 1200nm it has excellent transmittance, and the profiles are much higher than ordinary glass, the gross profit margin is up to 50%.
Textured solar glass have the excellent performance features of solar light transmittance, physical strength, flatness, low reflectance, low iron content, ect.. It takes advantages of reflection of the pattern to reduce the solar reflection, so the product has a high solar transmittance at any angle incidence. Furthermore, the low iron content of less than 120ppm enables a very low solar absorbance by the glass itself, and on the contrary increase the transmittance. The glass with non-toxic chemical composition comforms to the rigorous environmental requirement of Europe, USA and Japan.
Production technology features:
1. Control the COD value of raw materials and REDOX value for batch, and then control the ratio of iron content in liquid glass, to ensure textured solar glass with low-iron content and high transmission.
2. Using the most advanced furnace structure and melting technology in the world, combined with the three-dimensional dynamic mathematical computer simulation of furnace; greatly increasing of the liquid glass melting quality soundly meet the solar ultra-white glass melting of the special raw materials based on a high level of international practice and a line of software-based operation, which combined with features of ultra-white glass solar and reasonable development of fusion Technology system.
3. Using the most advanced and mature molding equipment, and introducing RUREX equipment from Germany, then producing textured solar glass with different specifications.
4. Distributed Computer Control Systems (DCS) control raw materials, furnace, forming. A central control room was set up in the core parts of the product line, as order to achieve short-range and long-range operations & control. To carry out all aspects of distributed control, centralized monitoring and management. Equipment to achieve the parameters of the process of detection, collection, data processing and automatic operation. Programmable logic products using automatic control System (PLC) and set up displays for the operation and management of dynamic display.
5. Solar energy ultra-clear glass production adopt scientific management and coordination of operations, in order to strengthen the management of detection, meet quantitative indicators and strict control of energy consumption.
Specifications and Properties
1. Thickness: 2.5mm-10mm standards: 3.2mm
2. Thickness Tolerance:±0.15 mm
3. Max size: 2250*3500mm
4. Solar Transmittance (3.2mm):≥91.6%
5. Iron Content: ≤120ppm Fe2O3
6. Poisson’s Ratio: 0.2
7. Density: 2.5g/cc
8. Young’s Modulus: 73Gpa
9. Tensile Strength: 42 Mpa
10. Hemispherical Emissivity: 0.84
11. Expansion Coefficient: 9.03*10-6/℃
12. Softening Point: 720℃
13. Annealing Point: 550℃
14. Strain Point: 500℃
