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两种以相对湿度为湿驱动势的热湿耦合传递模型的对比与验证
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湖南大学 土木工程学院

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Comparisons and validation of two models for coupled heat and moisture transfer driven by relative humidity
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College of Civil Engineering,Hunan University,Changsha

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“the 13th Five-Year” National Key R&D Program of China (Grant No. 2017YFC0702201);National Natural Science Foundation of China(51078127)

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    摘要:

    准确的动态热湿耦合传递模型对模拟和预测建筑围护结构热湿分布、提高室内空气品质和结构耐久性具有重要作用,因此该研究对以相对湿度为湿驱动势的两种热湿耦合传递模型-Künzel模型和Liu Chen模型-进行了对比与全面验证,包括理论验证、模型间验证和实验验证. 使用Fortran程序和COMSOL软件同时进行模拟,模拟结果分别与解析解、其他模型模拟解和单/双侧受控边界条件下的实验数据进行对比,模拟结果与对比值之间有良好一致性. 将两模型模拟结果进行对比,发现:在吸湿区内低相对湿度段,两模型差异不大;而在吸湿区末段(相对湿度逐渐增大至接近95%),Künzel模型不再能够准确模拟湿分布. 此研究表明两模型在吸湿区范围内都有可接受的精度,可推广应用,并为将来的热湿耦合模型验证提供参考.

    Abstract:

    Accurate dynamic models for the coupled heat and moisture transfer are important to simulate and predict the hygrothermal performance and to improve the indoor environment and structure durability. A comparison and comprehensive verification, i.e., including theoretical verification, inter-model verification and experimental verification, was performed on two models, the Künzel model and the Liu Chen model for the hygrothermal simulation of porous building envelopes, which are driven by relative humidity. The simulations were also carried out by two computation tools, self-programmed Fortran code and COMSOL Multiphysics for the two models. The verification showed that the simulation results of the two models agree well with the comparison values. Comparing the simulation results of the two models, it was found that the two models have little difference in the low relative humidity section in the hygroscopic range; while in the end of the hygroscopic range (relative humidity gradually increases to nearly 95%), the Künzel model can no longer accurately simulate the distributions of moisture. The investigations in this study demonstrate that the two models are accurate and applicable for hygrothermal simulations within the hygroscopic range and provide references for the verification of future hygrothermal models.

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  • 收稿日期: 2019-09-06
  • 最后修改日期: 2020-01-06
  • 录用日期: 2020-01-09
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