相变墙体温度变化的计算机模拟

Simulation of Temperature Changing Process of Phase Change Wall Material w ith Computer

利用Ansys强大的非线性分析功能,对相变材料的温度变化过程进行了模拟。将石蜡与石膏混合制成复合相变墙体,通过简化复合材料的物理模型,仿真了墙体温度的变化过程。利用相变材料焓值的变化来代替潜热,并分析了相变材料吸热升温的过程。结果表明,在一侧受热的情况下,温度沿厚度方向逐渐升高,但是升高速率缓慢;比较有肋片结构与无肋片结构的墙体结构可得到:肋片状结构有助于相变材料吸热融化,储存潜热,提高吸收效率。

In the experiment,the powerful nonlinear function of the Ansys was used to simulate the temperature changing process of phase change.A composite phase change wall was made from paraffin mixed with plaster.By simplifying the physics model to emulate the temperature changing process.The enthalpy was used to estimate the temperature increasing process.The results indicate that the temperature increased gradually along thickness direction,but the rise rate is low.Compared two kinds of wall structure,with fin shape structure or not,the result shows that the fin shape structure inside is helpful to the melts of the material,which can improve the heat storage and increase absorption efficiency.