基于COMSOL软件的深埋地下工程围护结构热湿耦合传递模拟
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TU111.4

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Coupled Heat and Moisture Transfer Simulation of Deep Underground Envelopes Based on COMSOL
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    摘要:

    围护结构内的热湿耦合传递是影响地下工程热湿负荷的重要因素,为了研究深埋地下工程中围护结构的热湿行为,通过建立热湿耦合传递模型,以两种衬砌结构为研究对象,利用COMSOL Multiphysics 的偏微分方程接口,耦合求解在时变边界条件下围护结构的温湿度分布。在进行热湿传递计算时,通常忽略材料含湿量对围护结构导热性能和水分输送性能的影响,造成一定的计算误差。为体现含湿量对材料物理性质的影响,模型中将建筑材料的各项参数表示为含湿量的函数。模拟结果表明:离壁式衬砌结构的热负荷远小于贴壁式衬砌结构;离壁式衬砌结构和室内空气的传湿量略小于贴壁式衬砌结构,两者相差大约30%;可见离壁式衬砌更能够减小深埋地下工程的热湿负荷,减小工程能耗水平。

    Abstract:

    Coupled heat and moisture transfer in envelopes significantly affects the heat and moisture loads of the underground buildings. In order to study the hygrothermal performance of two kinds of deep underground lining structures, a heat and moisture coupling transfer model was developed. The influence of the moisture content on the thermal conductivity, moisture transport character of the envelope structure is usually neglected unreasonably, resulting in calculation errors. The material properties was expressed as a function of moisture content to reflect the influence of moisture content on the heat and moisture transfer in the model. A partial differential equation interface in COMSOL Multiphysics was used to implement the simulation with a transient boundary conditions and the temperature field ,moisture field of the structures was abtained. The simulation results show that the thermal load of the off-wall lining structure is much smaller than that of the adherent lining structure; moisture flux between the off-wall lining structure and indoor air is slightly smaller than that between adherent lining structure and indoor air, which is about 30%; So off-wall lining structure performs better in reducing energy consumption of deep underground buildings.

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韦&#; 明,汪&#; 波,刘顺波. 基于COMSOL软件的深埋地下工程围护结构热湿耦合传递模拟[J]. 科学技术与工程, 2020, 20(14): 5729-5736.
WEI Ming, WAGN Bo, Liu Shunbo. Coupled Heat and Moisture Transfer Simulation of Deep Underground Envelopes Based on COMSOL[J]. Science Technology and Engineering,2020,20(14):5729-5736.

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  • 收稿日期:2019-08-12
  • 最后修改日期:2020-02-08
  • 录用日期:2019-11-10
  • 在线发布日期: 2020-06-11
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