摘要
地埋管换热器的换热性能对地源热泵系统的整体性能具有重要影响,基于传热理论分析及CFD模拟,能够快速精确地分析地埋管换热器的换热性能,提高地源热泵系统方案设计的准确性。本文建立了地埋管换热器的有限长线热源模型,分析了单个地埋管换热器的温度变化情况及单位长度换热量;通过CFD模拟分析了四个单U型地埋管换热器组合的传热特性,得到换热器及土壤的温度场分布,并研究了土壤的温度恢复特性。
The heat transfer of ground heat exchanger,comprising four vertically-buried U-tubes,of ground-source heat pump air-conditioning system,was empirically approximated,mathematically modeled,theoretically analyzed and numerically simulated with CFD software.The influence of the realistic situation,including,but not limited to the thermal properties of ground soil,cold and heat loads of building,and summer/winter seasons,on the heat exchange characteristics and temperature field distributions was investigated.The simulated results show that the seasonal thermal properties of ground-soil have a major impact.To be specific,in summer,the heat exchange per unit-length was 60.4 W/m,being 2.2%smaller than the theoretical prediction;and the radial/axial distributions of temperature field were calculated,respectively.Moreover,the ground temperature was found to decrease by 2.1℃after shut-down of ground-source heat pump for 90 days.
作者
陈忠
Chen Zhong(GD Power Datong Power Generation Co.,Ltd,Datong 037043,China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2020年第5期495-498,共4页
Chinese Journal of Vacuum Science and Technology
关键词
地源热泵
地埋管换热器
换热性能
CFD模拟
Ground source heat pump
Tube heat exchanger
Heat transfer performance
CFD simulation
