Transparent soil to model thermal processes: An energy pile example
Transparent soil to model thermal processes: An energy pile example
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DOI：
10.1520/gtj20140215
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发表时间：
2015-04
影响因子：
1.6
通讯作者：
J. A. Black;Alireza Tatari
中科院分区：
文献类型：
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作者：
J. A. Black;Alireza Tatari
能源管理正迅速成为21世纪的一个关键问题，基于地面的热交换能源结构被视为减少与调节建筑温度相关的碳排放的可行手段。由于在地基附近放置测量传感器的实际限制，关于地热结构与土壤的热力学相互作用的信息有限；因此，关于其长期性能和相互作用机制的问题仍然存在。提出了一种利用透明土壤和数字图像分析的替代实验方法来可视化土壤中的热流。本文主张将光学透明度的丧失作为透明土壤的一种有益属性，探讨了温度变化会改变其折射率从而逐渐降低其透明度从而变得更加不透明的假设。讨论了实验方法的发展，定义并验证了像素强度与土壤温度之间的关系。将该关系式应用于能量堆算例，验证了土壤中的热流。观察到影响加热区延伸到1.5桩直径的径向距离，并通过从桩传播的可视温度梯度来区分。这项技术的成功实施为透明土壤提供了一个新的范例，可能有助于理解土壤中的热力学过程。
Managing energy resources is fast becoming a crucial issue of the 21st century, with groundbased heat exchange energy structures targeted as a viable means of reducing carbon emissions associated with regulating building temperatures. Limited information exists about the thermo-dynamic interactions of geothermal structures and soil owing to the practical constraints of placing measurement sensors in proximity to foundations; hence, questions remain about their long-term performance and interaction mechanics. An alternative experimental method using transparent soil and digital image analysis was proposed to visualize heat flow in soil. Advocating the loss of optical clarity as a beneficial attribute of transparent soil, this paper explored the hypothesis that temperature change will alter its refractive index and therefore progressively reduce its transparency, becoming more opaque. The development of the experimental methodology was discussed and a relationship between pixel intensity and soil temperature was defined and verified. This relationship was applied to an energy pile example to demonstrate heat flow in soil. The heating zone of influence was observed to extend to a radial distance of 1.5 pile diameters and was differentiated by a visual thermal gradient propagating from the pile. The successful implementation of this technique provided a new paradigm for transparent soil to potentially contribute to the understanding of thermo-dynamic processes in soil.