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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。
Taking a project in Shanghai as an example, the thermal response of DN32 single U-shape and DN25 double U-shaped vertical buried pipe test holes was tested respectively by constant heat flux method with the self-developed testing device. The heat transfer per unit length And geothermal thermal properties of geothermal materials. The heat transfer per unit length of double U-shaped pipe is about 20% higher than that of single U-shaped pipe. The thermal conductivity of double U-shaped pipe is about 15% higher than that of single U-shaped pipe. It is suggested that the geological conditions of the site, the heat exchange of buried pipe unit length, the difficulty of pipe and drilling and other factors should be considered when choosing buried pipe form.