CFD SIMULATION AND MEASUREMENT OF THE HEAT TRANSFER FROM BUILDING MATERIAL SPECIMENS TO THE INDOOR ENVIRONMENT
CFD SIMULATION AND MEASUREMENT OF THE HEAT TRANSFER FROM BUILDING MATERIAL SPECIMENS TO THE INDOOR ENVIRONMENT
复制标题
从建筑材料样本到室内环境的热传递的 CFD 模拟和测量
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Bauhaus
中科院分区：
文献类型：
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作者：
C. Voelker;Markus Diewald;Bauhaus
在高频率荷载变化的混凝土耐久性和疲劳试验中，所研究的建筑材料试件会变得非常热。为了研究热的产生和热传递到室内环境，建立了一个实验装置。该装置的一个特别之处在于它嵌入了一个加热线圈，用来控制试样的温度。温度传感器测量了试样的表面和核心温度。此外，利用热敏电阻和风速计测量了探头周围的空气温度和流场。为了可视化样品的微气候温度分布，红外热像仪被使用。由于热成像仪只能检测表面温度，而不能检测空气温度，因此在样品周围建立了一个由纸板制成的辅助工作平面。这使我们能够可视化样品的日冕状边界层，并允许在整个平面上测量温度，而不仅仅是在热敏电阻所在的单个点上。利用计算流体动力学（CFD）进行模拟，补充了测量结果。采用耦合CFD模拟，模拟了试样内部的传热（传导）和对室内环境的传热（对流、辐射）。在模拟中，研究了不同的边界条件。为了验证CFD模拟的正确性，将模拟结果与实测结果进行了比较。综上所述，仿真值与实验值吻合较好。
During concrete endurance and fatigue tests with a high frequency of load changes, the investigated building material specimens can become very hot. To investigate the heat generation as well as the heat transfer to the indoor environment, an experimental setup was erected. A special feature of the setup was an embedded heating coil which controlled the temperature of the specimen. Temperature sensors measured the surface as well as the core temperature of the specimen. Additionally, the air temperature and flow field surrounding the probe was measured using thermistors and anemometry. To visualize the temperature profile of the specimen’s micro-climate, infrared thermography was used. Because thermography detects only surface temperatures, but not air temperature, an auxiliary work plane made of cardboard was built around the specimen. This allowed us to visualize the corona-shaped boundary layer of the specimen and allowed the temperature to be measured throughout the whole plane, not only at the individual points where the thermistors were located. The measurements were complemented with simulations using computational fluid dynamics (CFD). Using a coupled CFD simulation, the heat transfer within the specimen (conduction) and the heat transfer to the indoor environment (convection, radiation) were simulated. In the simulations, different boundary conditions have been studied. For the validation of the CFD simulations, the results have been compared with the measurements. In conclusion, the values of the simulations match the experiments quite well.