内嵌管式墙体热网模型参数配置研究及验证分析

Study and validation for simple configuration of thermal network model of pipe-embedded wall

针对内嵌管式墙体系统,建立一种RC(热阻热容)热网模型,并提出了基于墙体热工参数和几何尺寸确定模型参数的简单配置方法.进一步建立频域有限元模型,通过两种模型的频域热响应对热网模型进行对比验证.结果表明:RC热网模型与频域有限元模型之间能够很好地符合,模型较为可靠.同时建立了内嵌管式墙体的CFD(计算流体力学)模型,通过计算该模型及RC模型的时域热特性展开对比验证.结果表明:RC热网模型相对CFD模型的墙体边界热流的平均相对误差小于10%,温度的平均相对误差小于1%,也说明该模型的可靠性.

RC(resistance and capacitance)thermal network model was established for the pipe-embedded wall system,and one simple configuration method was proposed to determine the model parameters based on the wall thermal parameters and geometric dimensions.The finite element frequency domain model was further established and the thermal response of the two models in frequency domain was compared to verify the thermal network model.The results show that the RC heat network model and the finite element frequency domain model are in good agreement,which mean that the thermal network model is reliable.The CFD(computational fluid dynamics)model of pipe-embedded wall was also established,and the time domain thermal response of the RC model and CFD model were compared and verified.The results show that the average relative error of heat flux of wall boundaries between the RC heat network model and CFD model is less than 10%and the average relative error of the temperature is less than 1%,which also show the reliability of the RC model.