不封底PCC能量桩与传统能量桩换热效率对比研究

PCC能量桩是一种基于PCC桩的新型能量桩技术,目前针对PCC能量桩在制冷和供热过程中的换热效率及热传导特性的研究仍相对较少。基于模型试验方法,开展循环温度作用下不封底PCC能量桩、传统能量桩的温度响应测试,实测获得桩身、桩周土热响应变化规律;继而,结合数值模拟方法,对比分析进/出水温度等因素对不封底PCC能量桩换热效率的影响规律。研究结果表明,本文试验条件下,夏季制冷模式下不封底PCC能量桩的热响应略大于传统能量桩,而冬季供热模式下差异不大;相同条件下,夏季制冷模式下不封底PCC能量桩的换热效率较传统能量桩高出24%,而冬季供热模式下仅高7%。

Comparative Study on Heat Transfer Efficiency of PCC and Traditional Energy Pile

PCC energy pile is one of the new type energy piles based on PCC pile technology. However, there are relatively few studies focus on the heat transfer efficiency and heat transfer characteristics of this new type energy pile during cooling and heating. On the basis of model test method, the temperature response tests for the uncovered PCC energy pile and the traditional energy pile were carried out. The thermal response of the pile body and the soil around the pile were measured. Then, on the basis of numerical calculation method, the law of inlet/outlet temperature and the heat exchange rate of the two energy piles were comparatively analyzed. It shows that the thermal response of the uncovered PCC energy pile is a little higher than that of the traditional energy pile under same experimental conditions in summer cooling mode, but the difference is not obvious in winter heating mode. Compared with traditional energy piles, the heat transfer efficiency of the uncovered PCC energy piles can improve nearly 24% in summer cooling mode and 7% in winter heating mode under the same conditions.