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Evaluation of heat transfer in humidification phenomena – Comparison between infrared thermography and numerical simulation

机译：加湿现象中传热评价 - 红外热成像与数值模拟的比较

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Infrared thermography (IRT) is a non-destructive testing technology used to assess the performance of buildings. As a diagnosis tool for retrofit and conservation of buildings it helps understanding the anomalies by allowing “seeing” their causes in a non-invasive manner. However, in most cases, the interpretation of the results (thermal images) is mainly qualitative, restraining and, eventually, pointing to incorrect conclusions. Using numerical tools that contribute to the quantitative interpretation of IRT applications is therefore a step forward in this field. The main objective of this work is the evaluation of heat transfer in humidification phenomena by comparing the results of 2D hygrothermal simulation with thermal images. Thermal images were taken to a lightweight concrete specimen during a 24-hours partial immersion period. The humidification of the specimen was simulated using WUFI 2D. The best way to deal with the liquid water level in contact with the bottom of the specimen was deeply analysed. The comparison of the simulation with the results of IRT showed that the program tends to overestimate the phenomena of heat transfer (water rise and evaporation on the surface), as the water level reached in the simulation was consistently higher than the one obtained in the thermal images.
机译：红外热成像（IRT）是一种用于评估建筑物性能的非破坏性测试技术。作为改造和保护建筑物的诊断工具，它可以通过以非侵入性方式“看到”其原因来帮助理解异常。然而，在大多数情况下，对结果（热图像）的解释主要是定性，约束，最终指向不正确的结论。因此，使用有助于对IRT应用的定量解释的数值工具是该领域的一步。本作品的主要目的是通过将2D湿热模拟与热图像的结果进行比较来评估加湿现象的热传递。在24小时的部分浸没期间，热图像被送到轻质混凝土样本。使用Wufi 2D模拟样品的加湿。深切分析了处理与样本底部接触的液体水位的最佳方法。具有IRT结果的模拟的比较表明，该程序倾向于高估热传递（水上升和表面蒸发）的比较，因为模拟中达到的水位始终高于热量中获得的水位图片。

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