[1]吴迪,于明志*.基于穷举搜索法的地下岩土热物性参数分析[J].山东建筑大学学报,2016,(04):358-365.
 Wu Di,Yu Mingzhi*.Exhaustive search method to determine the underground soil thermal properties[J].Journal of Shandong jianzhu university,2016,(04):358-365.
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基于穷举搜索法的地下岩土热物性参数分析()
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《山东建筑大学学报》[ISSN:1673-7644/CN:37-1449/TU]

卷:
期数:
2016年04期
页码:
358-365
栏目:
研究论文
出版日期:
2016-08-15

文章信息/Info

Title:
Exhaustive search method to determine the underground soil thermal properties
作者:
吴迪1于明志12*
(1.山东建筑大学 热能工程学院,山东 济南 250101;2.山东建筑大学可再生能源建筑利用技术省部共建教育部重点实验室,山东 济南 250101)
Author(s):
Wu Di1Yu Mingzhi12*
(1. School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China; 2. Key Laboratory of Renewable Energy Utilization Technology in Building, Ministry of Education, Jinan 250101, China)
关键词:
关键词:岩土热物性参数穷举搜索法优化方法
Keywords:
Key words: soil thermal properties exhaustive search method optimization method
分类号:
TU201.5
文献标志码:
A
摘要:
摘要:地下岩土热物性参数测量的准确性影响地埋管换热器设计的合理性,进而影响地源热泵系统初投资和运行性能。文章利用穷举搜索法结合参数估计方法对热物性参数组合值进行全域搜索,并获得地埋管循环水温度测量值与模型计算值之间的方差和最小值,通过模拟验证该方法计算结果的可靠性,并与优化方法计算结果对比分析。结果表明:穷举搜索法可以确定较为准确的热物性参数值;优化方法仅确定的导热系数具有可靠性,相对误差小于1%,但钻孔内热阻和容积比热计算结果相对误差可达到70%以上,可信度较差;在实际工程中,优化方法所得的导热系数的值与穷举搜索法所得的值接近,但钻孔内热阻相对偏差最高可达41.42%,相对应的容积比热相对偏差最高为67.98%。
Abstract:
Abstract: The accuracy of measured underground soil thermal properties affects the designing rationality of ground heat exchangers and then influences the investment and operation performance of the ground source heat pump systems. Together with the parameter estimation method, the exhaustive search method is used to determine the underground soil thermal properties by thoroughly searching the combinations of different soil thermal properties. The minimum variance between the measured and calculated circulating water temperature is to be obtained. However, the soil thermal parameters corresponds to the minimum variance are the demanded results. After verifying the reliability verification of the exhaustive search method by simulation, the results are compared with those obtained by the optimization method. The result demonstrates that the exhaustive search method can obtain the more accurate group of soil thermal parameters. As comparison, though the optimization method can find the underground thermal conductivity with high credibility, the borehole thermal resistance and volumetric heat capacity are of poor credibility. The relative error of underground thermal conductivity is less than 1%, but that of the borehole thermal resistance and volumetric heat capacity are more than 70%. The results of thermal conductivity calculated by the optimization method range respectively from 2.00 to 2.02 W/(m·K) and from 1.00 to 1.02 W/(m·K) in these two projects. These results are close to the corresponding results of the exhaustive search method, 2.01 W/(m·K) and 1.01 W/(m·K). However, the borehole thermal resistance’s highest relative deviation can be up to 21.60% and 41.42%. And corresponding volumetric heat capacity’s highest relative deviation can reach 56.74% and 67.98%.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2016-05-18 基金项目:国家自然科学基金项目(51176104)作者简介:吴迪(1991-),男,在读硕士,主要从事新能源与节能技术等方面的研究,Email:wudisjd@sina.com *通讯作者:于明志(1970-),男,教授,博士,主要从事传热传质、能源利用及节能等方面的研究,Email:yumingzhiwh@163.com
更新日期/Last Update: 2016-10-25