考虑土壤分层的地源热泵圆柱面热源模型  

Cylindrical surface model of ground source heat pump considering soil stratification

作　　者：王子阳[1,2] 邵卫云[1] 张仪萍[1] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310058 [2]宁波市市政公用工程安全质量监督站,浙江宁波315016

出　　处：《浙江大学学报（工学版）》2013年第8期1338-1345,共8页Journal of Zhejiang University：Engineering Science

基　　金：浙江省重点科技创新团队计划资助项目(2010R50037)

摘　　要：为研究土壤分层特性对埋地换热器传热的影响,将不同土层的埋管换热器简化为分层圆柱面热源,同时根据叠加原理,构建考虑土壤分层的埋管换热器解析传热模型,并用Ansys有限元模型验证传热模型的合理性.分层传热模型与均质传热模型的计算结果对比表明:采用土壤分层传热模型计算得到的钻孔壁温升具有明显的分层特性,分层土壤导热系数和热扩散系数相对均质参数越大,计算得到的钻孔壁温升越小;采用分层传热模型计算得到的土壤稳态温升与均质模型计算结果存在较大差别;在考虑土壤分层时,地下埋管中循环液的出口温度与均质模型计算结果存在差异.In order to study the impact of soil stratification on the performances of underground heat exchanger,the heat exchanger in different soil layers has been simplified as the cylindrical surface heat source in each layer.An analytical heat transfer model considering soil stratification has been established based on the principle of superposition,and validated by FEM model of commercial software Ansys.The results of the present proposed model and the homogeneous heat transfer model were compared.It indicates that the borehole wall temperature rise calculated by the proposed model has a significant character of stratification,which decreases with the increasing soil thermal conductivity and thermal diffusivity of soil layer;the soil temperature rise calculated by the proposed stratified heat exchanger model is quite different from that calculated by the homogeneous model;once the soil stratification is taken into consideration,the temperature of circulating fluid temperature at the tube outlet is also different from that calculated by the homogeneous heat transfer model.

关 键 词：地源热泵 土壤分层 解析模型 土壤温度场 

分 类 号：TU111[建筑科学—建筑理论]