冷热循环作用下砂土地基能量桩热传递特性测试系统

能量桩是一种兼具换热和承担建筑荷载功能的新型建筑节能技术,为研究冷热循环温度影响下能量传递特性,设计了一套新型的能量桩模型实验及测试系统,较为系统地研究了砂土地基中预制单U型混凝土能量桩的传热特性。试验结果表明:在能量桩换热过程中,热量更易从桩体传递到土体;冷热循环中,桩身温度差异较小,温度沿桩身分布均匀;制热工况下能量桩在土体中的温度影响范围大于制冷工况,能量桩换热效率随着桩身与土体温度差异的减小而减小。

Test-system of heat transfer performance of energy pile under thermal cycling in Sand

Energy pile is a new building energy saving technology with both heat exchange and load bearing functions. However, there are few studies aimed at heat transfer performance of energy piles under thermal-cold cycling treatment. In this paper, a novel test system is proposed and fabricated to investigate the heat transfer performance of precast single U concrete energy pile in sand by model test method. The test results show that heat transfer from pile to soil is more easily in the process of energy piles and the difference of temperature along the pile is small and distributed evenly. In addition, the influence range of soil temperature field under cold cycles is greater than the heat cycles. With the decrease of temperature difference between pile and soil, the heat transfer efficiency also decreases.