地源热泵竖埋U形换热器一维数值模型  

One-dimensional numerical model for vertical U-tube ground heat exchanger of ground source heat pump system

作　　者：李茜[1] 苏华[1] 李晓虹[1] 张燕[1] 

机构地区：[1]西华大学能源与环境学院,四川成都610039

出　　处：《四川建筑科学研究》2012年第2期295-300,共6页Sichuan Building Science

基　　金：四川省教育厅重点项目(09ZA118);西华大学人才基金项目(R0720418)

摘　　要：地下换热器传热模型是地源热泵系统长期运行性能预测的基础。基于合理的简化处理,在柱坐标下建立了一种新的单孔及多孔竖埋U形换热器一维非稳态传热数值模型,并给出了求解算法。该模型基于任意时变冷热负荷,预测换热器进出水温及地温。用3组单孔实测数据进行了验证,出口水温模拟值与实测值最大绝对偏差为0.8℃,说明模型可靠准确。全年逐时动态模拟消耗机时不足1 min。综观计算功能、准确性及快速性,本模型可以作为地源热泵地下换热器设计分析的强有力的工具。Heat transfer model is essential to predicting performance of vertical U-tube ground heat exchanger.Based on reasonable hypothesis a novel 1-D transient numerical model is built in cylindrical coordinate system for single borehole and multiple boreholes,and the computing algorithm is also given.This model predicts outlet and inlet temperature of U-tube and ground temperature using arbitrary hourly load as inputs.Test data of 3 single-boreholes were used to validate the model＇s accuracy：comparison of outlet temperature between test and simulation shows that the maximum absolute bias is 0.8℃.It takes no more than 1 minute to hourly simulate the ground heat exchanger＇s performance in one-year period.Considering its computing ability,accuracy and speed the authors think the model may be a powerful tool for designing and analyzing borehole heat exchanger of ground source heat pump system.

关 键 词：地源热泵 竖埋U形换热器 数值模型 算法 

分 类 号：TU833.3[建筑科学—供热、供燃气、通风及空调工程]