单片低辐射玻璃谱带模型及其数值模拟

采用谱带模型,考虑了各个波段透射率、反射率对传热的影响,对单片低辐射玻璃的传热过程进行了研究,提出了描述此传热过程的非线性方程组;考虑对流、太阳辐射及外界和室内辐射等边界条件,并采用了牛顿法解方程组.计算结果表明,单片低辐射玻璃镀膜层向室内放置比较合理;另外,讨论了玻璃厚度、室内温度、室外风速对玻璃传热的影响.

Spectrum Model of Single Low Emissivity Glass and Its Numerical Simulation

The heat transfer behavior of low emissivity glass is strongly influenced by the wave length of radiation,so a model of single low emissivity glass is needed to represent it.This paper focuses on heat transfer of the single low emissivity glass,and spectrum model is used to obtain nonlinear equations which can represent the procedure in combination with the glass properties of transmissivity and reflectivity.The equations is solved using Newton method and considering the boundary conditions including convection,radiation of the sun,outside and inside of the room.The results show that it is appropriate to place the film of the single low emissivity glass at interior side.The model also shows the effects of glass thickness,indoor temperature and outdoor wind speed on the heat transfer of the glass.