浅埋地下建筑围护结构传热过程模拟研究

Simulation study on heat transfer process of shallow underground building envelope

目前地下建筑传热设计的规范和研究中较少考虑地表温度的动态变化,导致结果误差较大,因此寻求一种简便准确的地下建筑传热计算方法是十分必要的。文章提出将室外温度取实际室外地表温度逐时值,建立了地下建筑围护的三维非稳态传热模型,并以济南市某地下建筑为例,应用有限差分法分析地下建筑热流及温度场变化等传热特性,同时比较了现有3种常见的研究方法。结果表明:现有3种研究方法所得热流计算结果与实际温度相比均存在>10%的误差;所提方法的计算误差可减少至6.28%,可以更有效地反映地下建筑传热特性,具有更高的准确性。

At present,the codes and researches on the heat transfer design of underground buildings seldom consider the dynamic changes of the surface temperature,which leads to large errors in the results.Therefore,it is necessary to seek a simple and accurate method for calculating the heat transfer of underground buildings.The article proposes to take the outdoor temperature as the actual outdoor surface temperature time-by-time value,and establishes a three-dimensional unsteady heat transfer model of the underground building enclosure.Taking an underground building in Jinan as an example,the finite difference method was applied to analyze the heat transfer characteristics of underground buildings such as heat flow and temperature field changes,while comparing the existing three common research methods.The results show that compared with the actual temperature,the calculation results of heat flow obtained by the existing research methods all have errors of more than 10%.The calculation error of the method proposed in the article can be reduced to 6.28%,which can reflect the heat transfer characteristics of underground buildings more effectively and has higher accuracy.