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预埋钢管能量桩是一种新型桩埋管形式的地源热泵技术,然而,针对其特殊埋管形式下传热特性的研究却相对较少。针对预埋钢管单U型埋管能量桩的传热管-钢管-混凝土-桩周土的传热特性开展模型试验和数值模拟研究,测得在热-冷循环温度荷载作用下预埋钢管单U型埋管能量桩桩体及桩周土体的温度变化规律;为了对比分析,同时开展了传统绑扎单U型埋管能量桩的传热特性模型试验,并分析了预埋钢管能量桩的适用性。研究结果表明,预埋钢管能量桩的传热性能略低于绑扎埋管能量桩的传热性能;夏季工况两种埋管形式能量桩桩体温度和桩周土体温度最终变化量分别相差23%和16%左右;冬季工况该数值约为14%和18%左右。
Embedded steel pipe energy pile is a new type of ground-source heat pump technology in the form of pile-buried pipe. However, there are relatively few studies on the heat transfer characteristics under the special buried pipe form. Aiming at the heat transfer characteristics of heat transfer pipe-steel pipe-concrete-pile surrounding soil of single U-shaped embedded tubular energy pile, a model test and a numerical simulation study were conducted. The results of model test and numerical simulation show that under the temperature- U-shaped buried pipe energy pile body and the soil around the pile body. For the sake of comparative analysis, the heat transfer characteristics of traditional single bundle U-shaped buried pipe pile were also studied. applicability. The results show that the heat transfer performance of the embedded steel tube energy pile is slightly lower than the heat transfer performance of the bundled energy pipe pile. The difference between the temperature change of the two buried pipe energy pile and the soil temperature change during the summer 23% and 16% respectively. The winter condition is about 14% and about 18%.