地埋管换热器钻孔换热热阻与水力平衡综合分析  

Comprehensive analysis for thermal resistance of ground heat exchanger and hydraulic balance

作　　者：杨杰[1,2] 张辉[3] 崔萍 方肇洪[4] 

机构地区：[1]山东建筑大学热能工程学院,山东济南250101 [2]可再生能源建筑利用技术省部共建教育部重点实验室,山东济南250101 [3]滨州市污水处理厂,山东滨州256600 [4]山东中瑞新能源科技有限公司,山东济南250101

出　　处：《可再生能源》2014年第9期1359-1364,共6页Renewable Energy Resources

基　　金：国家自然科学基金项目(51208286);国家科技支撑计划子课题(2012BAJ06B03-01);山东省大型科学仪器设备升级改造技术研究专项基金项目(2013SJGZ15)

摘　　要：针对实际工程中地埋管换热器各并联埋管的水力不平衡情况,采用理论分析与设计软件模拟计算相结合的方式,分析了地埋管水力不平衡对地埋管钻孔内外换热热阻的影响。分析结果表明,当阻力不平衡率在±30%以内时,地埋管换热器钻孔内的传热热阻变化在±5%以内;长期运行的地埋管换热器钻孔内热阻在钻孔总热阻中所占比例很小,因此钻孔内热阻在±5%范围内变化对地埋管换热器总热阻的影响是可以忽略不计的;如果并联埋管环路阻力不平衡率在30%以内,建议采用异程连接,这样可以大大降低管材成本。Some concerns have been raised on hydraulic imbalance of pipes in boreholes connected in parallel for geothermal heat pumps. The influenee of hydraulic imbalance of ground heat exchanger in boreholes on borehole thermal resistance is analyzed by means of a professional design ＆ simulation software. The results show that variation of the borehole thermal resistance is within ＋5% when the hydraulic imbalance rate varies in the range of ±30%. However, the borehole thermal resistance only contributes to less than ±5% of total thermal resistance of a ground heat exehanger. This indieates that influence of the hydraulic imbalance on the borehole thermal resistance can be neglected. Finally, the direct return system is suggested for the case of hydraulic imbalance within 30% , which can significantly reduce pipe cost compared to reverse return system.

关 键 词：水力失调 传热热阻 异程式系统 地埋管换热器 

分 类 号：TK529[动力工程及工程热物理—热能工程]