摘要
使用数值模拟方法建立了地埋管换热器三维模型,并使用文献数据和热响应测试数据验证了此模型。考察了地下渗流水水温度、流速对地埋管换热量的影响,得出不同条件下地埋管的单位井深换热量。通过模拟发现,在未渗流情况下,地源热泵存在严重的热堆积;地下水渗流可消除热积聚,且地下水渗流的温度和速度对热迁移有着规律性的影响。当地下水温处于冰点以上时,水温越低,渗流速度越大,地下水渗流可更好地消除热积聚现象,且高渗流速度可确保单位井深换热量尽早达到稳定状态。
A 3 D model of buried pipe heat exchanger with the same size is established and validated by the reference data and data from authors’heat response test.On the basis,influences of underground water seepage temperature and velocity on the heat exchanger are investigated.And then,the heat transfer capacity of single well depth in heat exchanger under different conditions is calculated.It is concluded that a serious heat accumulation happens in the ground source heat pump without the underground water seepage.With the seepage flow,the effect of heat accumulation dissipation is enhanced,and the temperature and velocity of underground water seepage have regular influence on thermal migration.If the groundwater temperature is above the water freezing point,the heat accumulation phenomenon can be better eliminated with lower water temperature and greater seepage velocity.In addition,the steady state of heat transfer can be better achieved by higher seepage velocity.
作者
王瑜
刘志成
WANG Yu;LIU Zhicheng(College of Urban Construction,Nanjing Tech University,Nanjing 210009,China)
出处
《实验室研究与探索》
CAS
北大核心
2019年第9期52-57,共6页
Research and Exploration In Laboratory
基金
国家自然科学基金项目(51806096)
江苏省高校自然科学基金项目(18KJB560007)
关键词
地源热泵
热积聚
地下水温度
渗流速度
数值模拟
ground source heat pump
heat accumulation
underground water temperature
seepage velocity
numerical simulation
作者简介
王瑜(1988-),男,江苏泰兴人,博士,讲师,现主要从事高效换热研究。Tel.:025-83239533,E-mail:cbcpboazml@163.com
