管群间歇散热的土壤温度响应与恢复特性  

Soil temperature response and recovery characteristics of intermittent heat emission in multi-boreholes

作　　者：张琳琳[1] 赵蕾[1] 杨柳[2] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]西安建筑科技大学建筑学院,陕西西安710055

出　　处：《浙江大学学报（工学版）》2016年第2期299-305,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家"十一五"科技部科技支撑计划资助项目(2014BAJ01B01)

摘　　要：为了分析地下水渗流作用下地埋管群的传热性能,基于移动有限长线热源模型解析解,结合叠加原理给出地埋管群在土壤中散热所引起的动态温度响应的解析解.对一个3×3顺排管群在土壤中的传热过程进行三维动态数值仿真,验证解析解的正确性.基于解析解研究地下水渗流作用下管群换热器连续和间歇散热所引起的土壤温度响应特征.结果表明:当间歇运行时,可缓解管群间的热干扰,使得土壤温升显著减小,即土壤温度得到一定程度的恢复.针对地埋管间歇散热的情况,探讨渗流速度和土壤热物性对土壤温度响应和恢复特性的影响规律.结果表明:渗流速度越大,土壤温度恢复的幅度越大,且土壤物性对土壤温度响应和恢复特性的影响也很明显.地埋换热管群所引起的土壤温度响应和恢复特性受地质状况和地下水渗流速度的综合作用影响.An analytical model was established to analyze the dynamic soil temperature response to heat emission from multi-boreholesbased on the superposition principle and the moving line heat source model to consider the influence of groundwater advection on heat transfer performance of multiple borehole heat exchangers.The analytical solution to the soil dynamic response to heat emission of a 3×3multi-boreholes arranged in line in the soil with groundwater advection was validated by transient 3Dnumerical simulation results.The soil temperature changed to a continuous and an intermittent heat emission of the multiboreholes under the influence of groundwater advection were analyzed based on the analytical solutions.Results show that intermittent operation can reduce thermal interference among the multi-boreholes in the soil and the temperature increment can be reduced significantly,that is,soil temperature can recover to some extent.The influence of groundwater advection velocity and soil thermal properties on soil temperature response and recovery characteristics was analyzed as well for the cases of intermittent heat emission.Result indicate that an increase in groundwater advection velocity leads to an increase in the magnitude of soil temperature recovery.And the soil physical properties also have impact on soil temperature recovery characteristics,which means that the soil temperature response and recovery characteristics to multi-boreholes heat exchanger are comprehensively affected by geological conditions and groundwater advection.

关 键 词：土壤源热泵 地下水渗流 间歇运行 叠加原理 地温恢复 

分 类 号：TK172[动力工程及工程热物理—热能工程] TK529