考虑地下渗流影响的能源地连墙换热性能研究

Study on Heat Transfer Performance of Energy Diaphragm Wall Considering Underground Seepage

摘要:

能源地下连续墙是一类新型的能源地下结构，兼顾结构承载和热量交换的双重功能，地下渗流对能源结构的换热性能影响显著，有必要开展深入研究。以上海自然博物馆的能源地下连续墙为工程背景，利用COMSOL 多物理场耦合软件构建数值模型，分析了换热管入口温度、地下水渗流方向、渗流速度、换热运行模式和运行周期对地连墙结构换热量的影响规律。结果表明，地下渗流的流速和方向都对能源结构换热有显著的影响，地下渗流能有效地缓解地下结构换热引起的热量积累，保障能源结构的换热效率。因此，能源地下结构适合在有较好渗流条件的地质环境中应用。地源热泵间歇运行可以有助于土体中的热量恢复，在长期运行工况下，能源结构在夏季的换热量要高于冬季。研究成果对完善能源地下连续墙的设计理论具有一定的参考意义，有助于推动浅层地热能的开发利用。

Abstract:

The energy diaphragm wall is a new type of underground energy structure that combines thedual functions of structural bearing and heat exchange. Underground seepage significantly impacts theheat transfer performance of energy structures, necessitating in-depth research. Taking the energy diaphragmwall of the Shanghai Natural History Museum as the engineering background, a numericalmodel was established using COMSOL multi-physical field coupling software to analyze the influenceof the heat exchange tube inlet temperature, groundwater seepage direction, seepage velocity, heatexchange operation mode, and operation period on the heat exchange of the underground diaphragmwall structure. The results showed that both the velocity and direction of underground seepage significantlyaffected the heat transfer of the energy structures. Underground seepage could effectively alleviatethe heat accumulation caused by heat exchange in underground structures, ensuring the heat exchangeefficiency of energy structures. Therefore, energy underground structures are suitable for geological environments with good seepage conditions. Intermittent operation of ground source heatpumps can help restore the heat in the soil mass. Under long-term operation conditions, the heat exchangein energy structures is higher in summer than in winter. The research results provide a certainreference for improving the design theory of energy underground diaphragm walls and contribute to thedevelopment and utilization of shallow geothermal energy.