不同土质条件下土壤蓄热特性的数值模拟研究  

Numerical simulation study of soil heat storage characteristics under different soil conditions

作　　者：郭海丰[1] 杨瑞妙 姜云鹏 杨钰杰 GUO Hai-feng;YANG Rui-miao;JIANG yun-peng;YANG Yu-jie(School of Municipal and Environmental Engineering,Shenyang JianZhu University,110168,Shenyang,China)

机构地区：[1]沈阳建筑大学市政与环境工程学院,沈阳110168

出　　处：《建筑技术》2024年第15期1908-1914,共7页Architecture Technology

摘　　要：选取严寒地区、寒冷地区、夏热冬冷地区典型地源热泵作为研究对象,建立地埋管及周围土壤的物理模型,根据不同地域的地质条件,为土壤区域设置不同的热物性参数及分层数,对整个蓄热季的地埋管及周围土壤的换热情况进行数值模拟,探究地质条件对地源热泵换热特性及土壤蓄热量的影响。结果表明,由于所选各地区土壤热物性参数及分层数不同,整个蓄热季后土壤蓄热量差异较大,严寒地区、寒冷地区、夏热冬冷地区土壤蓄热量分别为949.251 MJ、1 031.122 MJ和709.225 MJ。受土壤各层热物性参数差异影响,同一地区各层土壤的热量传递半径及升温速率也存在较大不同。粉质粘土层热量传递半径大,中粗砂与淤泥质粘土层温度提升快。此外,在整个蓄热季中,受土壤热容增大影响,蓄热效率呈现出下降趋势,在实际运行过程中应采用间歇蓄热,提升蓄热效率。In this study,the typical ground source heat pumps in cold region,cold region and hot summer and cold winter region are selected as the research object,the physical model of buried pipe and the surrounding soil is established,and different thermal and physical parameters and number of layers are set for the soil area according to the geological conditions of different regions,and the numerical simulation is carried out for the heat exchange of the buried pipe and the surrounding soil throughout the heat storage season,to explore the influence of the geological conditions on the heat exchange characteristics of the ground source heat pumps and the amount of heat storage in the soil.The results show that the geological conditions of the selected soil.Due to the different thermophysical parameters and layering number of soil in each region,there are large differences in the soil heat storage capacity after the whole heat storage season,and the soil heat storage capacity in the cold region,cold region and hot summer/cold winter region are 949.251 MJ,1031.122 MJ and 709.225 MJ,respectively.Due to the differences in thermophysical parameters of each soil layer,the radius of heat transfer of the soil layers and the rate of warming in the same region are also different.The heat transfer radius and warming rate of each soil layer in the same area also differed greatly.The heat transfer radius of the silty clay layer was large,and the temperature of the medium-coarse sand and silty clay layers increased rapidly.In addition,in the whole heat storage season,affected by the increase of soil heat capacity,the heat storage efficiency shows a downward trend,in the actual operation process should be used intermittent heat storage,improve the heat storage efficiency.

关 键 词：地埋管换热 土壤蓄热 土壤分层模型 蓄热量 蓄热特性 

分 类 号：TU1[建筑科学—建筑理论]