竖直U形地埋管流速与换热强度实验研究
Experimental research on flow rate and heat transfer intensity of U-type vertical buried pipe
摘要：
在2个实际工程现场钻取测试井，采用常见的竖直U形地埋管形式，设定不同的管内流速，测得模拟冬、夏季工况下的进出口水温，计算出单位井深换热量，分析了管内流速对地埋管换热强度的影响。结果表明，在0.6～0.9 m/s的流速范围内，地埋管换热强度随流速的增大而增大，超出这一范围，增大流速会导致换热强度降低。
Abstract：
Drills the test wells on two project sites, with a common form of U-type vertical buried pipe, selects different flow rates in pipes, and measures inlet and outlet water temperatures under the simulated winter and summer conditions. Calculates heat exchange per unit well depth, and studies and analyses the influence of flow rate on the heat transfer intensity of pipes. The results show that within the range of 0.6 to 0.9 m/s, the higher the flow rate is, the higher the heat transfer intensity is. Beyond this range, the increase of flow rate may result in a reduction of the heat transfer intensity.
Keywords:U-type vertical buried pipe, flow rate in pipe, heat transfer intensity, experimental test, heat exchange per unit well depth