DOI: 10.3724/SP.J.1249.2022.01020
备注
相比传统钻孔埋管换热器地热采集技术，不断优化的能源桩技术在建筑节能工程应用中更具高效及经济优势.根据深层埋管型能源桩、桩内埋管型能源桩及传统钻孔埋管换热器3种不同地埋管换热器的结构特点，通过现场试验及数值模拟分析3者换热特性.结果表明，相同埋深下，深层埋管型能源桩单桩换热量及换热效率均高于传统钻孔埋管换热器；相同桩长下，深层埋管型能源桩单桩换热量高于桩内埋管型能源桩；桩基的高导热性可显著提高换热器的换热效果，深层埋管型能源桩的井-桩段换热比达到1.95；深井的设置不仅可以降低桩基热堆积引起的热干扰，还可以弥补换热管间距较小对换热量产生的不利影响.研究表明，通过优化换热器施工工艺，降低换热管间的热干扰效应，可有效提高换热器整体换热效果.
Compared with traditional bored pipe heat exchanger geothermal collection technology, the continuously optimized energy pile technology is more efficient and economical in the application of building energy-saving projects. According to the structural characteristics of three different underground heat exchangers of deep buried pipe energy pile, inside buried pipe energy pile and traditional bored and buried pipe heat exchanger, we analyze the heat transfer characteristics through field test and numerical simulation. The results show that at the same depth, the heat exchange and heat exchange efficiency of single deep buried pipe energy pile are higher than those of traditional bored buried heat exchanger. Under the same pile length, the heat exchange rate of single deep buried pipe energy pile is higher than that of the inside buried pipe energy pile. The high thermal conductivity of the pile foundation can significantly improve the heat exchange effect of the heat exchanger. The well-pile section heat exchange ratio of the deep buried pipe energy pile reaches 1.95. The installation of the deep well can not only reduce the thermal interference caused by the pile foundation thermal accumulation, but also compensate for the adverse effect of the small heat exchange tube spacing on the heat exchange. By optimizing the construction process of the heat exchanger and reducing the thermal interference effect between the heat exchange tubes, the overall heat exchange effect of the heat exchanger will be effectively improved.
