热力弥散对地埋管换热器所在含水层传热过程的影响  

INFLUENCE OF THERMAL DISPERSION ON TRANSFER PROCESS IN AQUIFERS AROUND BOREHOLE HEAT EXCHANGERS

作　　者：马玖辰 王文君[1,2] 魏璠 王宇 Ma Jiuchen;Wang Wenjun;Wei Fan;Wang Yu(School of Energy Safety Engineering,Tianjin Chengjian University,Tianjin 300384,China;Research Center for Efficient Utilization Technology of Geothermal Energy,Tianjin Chengjian University,Tianjin 300384,China)

机构地区：[1]天津城建大学能源与安全工程学院,天津300384 [2]天津城建大学地热高效利用技术研究中心,天津300384

出　　处：《太阳能学报》2021年第3期164-170,共7页Acta Energiae Solaris Sinica

基　　金：天津市自然科学基金企业科技特派员项目(17JCTPJC52900);天津市教委科研计划(2017KJ050)。

摘　　要：针对地埋管换热器所在含水层三维非稳态传热模型进行优化,建立涵盖热力弥散效应的含水层过余温度解析模型。结合渗流砂箱热响应实验,探究热力弥散效应对于含水层传热特性与热扩散范围的影响。研究结果表明,当考虑热力弥散效应时,各观测点过余温度解析解与实验结果相似度增强,两者均方根误差RMSE(Θ)小于3%。通过计算得到,热力弥散效应对于含水层温度场演化过程的影响具有时空非一致性特征。当含水层中传热过程趋于稳定后,随着热力弥散效应的提高,地埋管井群所在区域过余温度变化幅度增大;位于下游区域的过余温度变化幅度则逐渐下降,热扩散范围缩小。A three-dimensional unsteady state numerical model is optimized for the simulation of heat transport in aquifers which is evolved from borehole heat exchangers(BHEs). Moreover,an analytical model including thermal dispersion is developed to calculate the excess temperature in aquifers. Combined with the thermal response experiment in the seepage sandbox,the analytical model is probed into the influence of thermal dispersion on heat transfer characteristic and the thermal effective radius in aquifers. Considering the effect of thermal dispersion,analytical solutions of excess temperature at each observation point are favorable similarity with experimental results. The root mean square error of excess temperature RMSE(Θ)are less than 3% between calculated results and test results. The calculation indicated that the influence of thermal dispersion on the evolutionary process of the temperature field in aquifers have the characteristic of space-time inconsistency. When the heat transfer process tends to steady state,the rate and magnitude of the excess temperature change increases significantly in the region of BHEs while the thermal dispersion increases. However,the magnitude of the excess temperature change decreases gradually in the downstream area of BHEs which the thermal effective radius is reduced.

关 键 词：地埋管 解析模型 热泵 温度场分布 热力弥散效应 

分 类 号：TK529[动力工程及工程热物理—热能工程]