地源热泵U形竖直地埋管热响应试验及分析
Thermal response test and analysis of U-type vertical pipe of ground-source heat pumps
摘要：
以上海某工程为例，通过自主研发的测试装置，采用恒热流法分别对DN32单U形及DN25双U形竖直地埋管试验孔进行了热响应测试，得到了单位管长换热量及岩土的热物性参数，其中双U形管单位管长换热量比单U形管高约20%；双U形管导热系数比单U形管高约15%。建议在选择地埋管形式时应综合考虑场地地质条件、埋管单位管长换热量、管材及钻井难易等因素。
Abstract：
Taking a project in Shanghai as an example, conducts thermal response tests of the single U-type pipe with diameter of DN32 and the double U-type pipe with diameter of DN25 by means of a constant thermal flow method through the test device developed independently. Gains the heat exchange capacity of unit pipe length and the thermo-physical properties of soil. The results show that the heat exchange capacity of unit pipe length of the double U pipe is 20 percent greater than that of the single U pipe and that the heat conductivity of double U pipe is 15 percent greater than that of the single U pipe. Suggests considering geological conditions at site, heat exchange capacity of unit pipe length, pipe material, drilling condition, etc. when selecting the type of the buried pipes.
Keywords:ground source heat pump, U-type vertical pipe, thermal response, test