Simulation and improvement of energy consumption on intelligent glasses in typical cities of China

• DOI: 10.1007/s11431-012-4854-1
• Publication Date: 2012-05-23T19:29:05Z
• Authors: XiaoJie Xu; Xi Wu; Chao Zhao; JiangXiang Wang; XiaoTong Ge
• Keywords: TRNSYS; Low emissivity

Five windows such as white glass, Low-E glasses and intelligent glasses are employed for simulation of heating and cooling energy consumptions in five typical cities of China by the software TRNSYS 16. The result shows that it is the most energy saving for the doubled glass when the VO2 films are deposited on the inside surface of the outer pane. And it is 84.7% of energy saving compared with white glass. But the heating energy consumption is the highest. This is because the transition temperature of real intelligent glass is too high and the solar heat gain coefficient is very small when the glass is in the cold state. On this basis, the property of intelligent glass is improved from the theoretical level. The result shows that it can be the most effective way of energy saving when emissivity is 0, solar transmittance is 100% in the cold state; visible light transmittance is 100%, infrared and ultraviolet light transmission rate is 0 in the hot state. Because of the technology limitation, it is hard to lower the transition temperature to below 20°C. The transition temperature of the film should be lower and the emissivity higher as far as possible.