基于线热源模型的地下岩土热物性测试方法  

LINE SOURCE METHOD FOR MEASURING THERMAL PROERTIES OF DEEP GROUND

作　　者：于明志[1] 彭晓峰[1] 方肇洪[2] 李晓东[2] 

机构地区：[1]清华大学热能工程系相变与界面现象传递实验室,北京100084 [2]山东建筑工程学院地源热泵研究所,济南250014

出　　处：《太阳能学报》2006年第3期279-283,共5页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金重点项目(No.50136020)

摘　　要：提出了一种用于竖直埋管与周围岩土的传热分析模型。该方法回避了其它模型对钻孔中埋管的具体位置、上升管和下降管之间的距离以及埋管和回填材料的物性等参数的要求,从而可以消除上述参数测量带来的误差。在现场钻孔,埋设U型埋管,通过测量施加的加热功率、埋管中循环水流量、埋管出入口水温随时间变化,利用该模型并结合最优化估计方法,确定了某地源热泵空调系统工地地下岩土的热物性参数,检验证实了该方法的实用性和可靠性。To determine deep ground soil conductivity, specific volumetric heat capacity at work site and in other associated engineering application, a heat transfer model was proposed for analyzing heat transfer between vertical buried tube and surrounding soil. This method doesn＇ t need exact information of the buried tube location in the borehole, spacing between up and down tubes, the properties of the tube and the backfill, and other parameters in the borehole, and accordingly eliminating the errors caused by measuring these parameters mentioned. A site test was conducted to obtain heat flux imposed on the buried loop, circulating water flow rate, temperatures at the outlet and inlet of the loop by an in-situ test apparatus. The model, together with estimation algorithm, was used to determine the thermal properties of the deep ground soil at the worksite. Results show that this method can shorten testing time.

关 键 词：传热模型 测量 岩土 热物性参数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]