Energy diaphragm wall thermal design: The effects of pipe configuration and spacing
Energy diaphragm wall thermal design: The effects of pipe configuration and spacing
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DOI：
10.1016/j.renene.2020.02.112
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发表时间：
2020-07
期刊：
影响因子：
8.7
通讯作者：
Nikolas Makasis;G. Narsilio
中科院分区：
文献类型：
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作者：
Nikolas Makasis;G. Narsilio
能源地质结构利用主要为结构和地质力学稳定性而设计的地下结构，也提供可再生的地热能用于加热和冷却目的。管道被纳入结构中，通过载体（水）与地面交换热量，并连接到建筑侧的地面耦合热泵。这项工作的重点是能源地下连续墙，扩大有限的可用知识，并进行全面的参数分析，使用实验验证的数值模拟。重点讨论了地热设计中可直接控制的壁管配置和间距，同时考虑了地下导热系数和壁厚的影响。墙的深度被认为是热性能的一个关键因素，低导热性材料的网站可能需要深能量墙的成本效益的设计。较大的管道间距（≥500 mm）似乎更可取，尽管放置的管道较少，因为小间距导致成本增加，但热性能增益不明显。比较水平和垂直管道配置，发现温差相对较小，小于1 °C。此外，对于多段较深的墙壁，前者可以更便宜，而后者适用于较短的墙壁或施工延迟不重要时。
Energy geo-structures utilise underground structures primarily designed for structural and geo-mechanical stability to also provide renewable geothermal energy for heating and cooling purposes. Piping is incorporated in the structures to exchange heat with the ground via a carrier (water) and connected to a ground-coupled heat pump on the building side. This work focuses on energy diaphragm walls, expanding on the limited available knowledge and undertaking a comprehensive parametric analysis using experimentally validated numerical modelling. Focus is put on the wall pipe configuration and spacing, which are parameters the geothermal design can directly control, however, the effects of ground thermal conductivity and wall depth are also considered. The wall depth is shown as a critical factor to the thermal performance and low thermal conductivity material sites might require deep energy walls for a cost-effective design. Larger pipe spacing (≥500 mm) appears preferable, despite less piping being placed, since small spacing leads to increased costs but insignificant thermal performance gains. Comparing the horizontal and vertical pipe configurations, relatively small temperature differences of less than 1 °C are found. Moreover, the former can be less expensive for multiple-section deeper walls, while the latter for shorter walls or when construction delays are non-critical.