现场试验工况对岩土热物性参数确定的影响  

Effect of In-situ experimental conditions on determination of ground thermal properties parameters

作　　者：张长兴 孙鹏堃 王新杰 徐航 Zhang Changxing;Sun Pengkun;Wang Xinjie;Xu Hang(Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,College of Civil Engineering and Architectural,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学土木工程与建筑学院,山东省土木工程防灾减灾重点试验室,山东青岛266590

出　　处：《可再生能源》2022年第4期463-467,共5页Renewable Energy Resources

基　　金：国家自然科学基金项目(51776115);山东省自然科学基金项目资助(ZR2020ME187);山东省高等学校科技计划项目(J16LG06);山东科技大学科研创新团队支持计划项目(2015KYTD104)。

摘　　要：土壤源热泵地埋管换热器系统设计的合理性取决于地埋管换热器热阻和岩土体热物性参数的准确性。为提高土壤导热系数及换热器热阻估算的准确性,文章基于现场热物性试验,利用正交试验方法确定了各因素对测试结果的影响情况,并进行了定量分析。结果表明:测试时间对热物性估算结果的影响最大。当测试时间由50 h增至100 h时,土壤导热系数估算结果与设定值的相对误差均值由12.11%降到0.75%,地埋管换热器热阻值由0.1245(m·℃)/W变为0.1077(m·℃)/W,而加热功率、流量、埋管深度等因素对结果影响程度远小于测试时间。With the widely application of ground-source heat pump system,the rationality of system design is particularly prominent,which depends on the accuracy of borehole heat exchanger and soil thermal physical parameters.In order to improve the accuracy of the estimation of the thermal conductivity of the soil and the thermal resistance of the heat exchanger,the influence of each factor on the test results was determined by the orthogonal test method,and the influence was analyzed quantitatively based on thermal response test.The results show that the test time has the greatest effect on the thermal property estimation results,When the test time was increased from 50 h to 100 h,the average relative error between the soil thermal conductivity estimation and the set value is reduced from 12.11%to 0.75%,and the thermal resistance of borehole heat exchanger is changed from 0.1245(m·℃)/W to 0.1077(m·℃)/W.The influence of heating power,flow rate and buried borehole depth is much smaller than that of the test time.

关 键 词：土壤源热泵 热物性参数 导热系数 换热器热阻 正交试验方法 

分 类 号：TK521[动力工程及工程热物理—热能工程]