流速对垂直双U形地埋管换热器热交换的影响  

The effect of fluid velocity on heat transfer of vertical double U-tube heat exchanger

作　　者：宋英峰[1] 吴学红[1] 龚毅[1] 

机构地区：[1]郑州轻工业学院机电工程学院,河南郑州450002

出　　处：《郑州轻工业学院学报（自然科学版）》2013年第1期57-61,共5页Journal of Zhengzhou University of Light Industry:Natural Science

基　　金：国家科技支撑计划项目(2006BAJ01A10);河南省省院合作项目(092106000013);郑州市科技创新团队项目(10CXTD151)

摘　　要：针对设计地源热泵室外侧换热器时钻孔间距过大会浪费土地资源,过小又会导致土壤温度持续变化、降低换热效果的问题,通过建立系统运行费用函数,研究了系统连续运行30 d时模拟流速对热力半径的影响.结果显示,0.4 m/s时,热力半径达到0.95 m,随着流速的增大,热力半径增大,在流速>0.6 m/s时,热力半径增幅明显减少.It is necessary to determine a reasonable bore distance when we design the outdoors heat exchanger of the ground-coupled heat pump. The larger distance will cause the waste of ground source, on the contrary, it will change the soil temparature and reduce the efficiency of heat exchanger. So, the effect of fluid velocity on thermal radius was simulated through builting the system runing cost function when sys- tem had worked 30 d. The computational results showed that thermal radius is 0.95 m when fluid velocity is 0.4 m/s, which increases with increasing fluid velocity. But the thermal radius range is obviously slight when fluid velocity is more than 0.6 m/s.

关 键 词：地源热泵 双U管热力半径 经济流速 数值模拟 

分 类 号：TK521[动力工程及工程热物理—热能工程]