摘要
本文以能量守恒和质量守恒为基础建立了土壤耦合热泵U型埋管换热器三维非稳态模型,重点研究了回填材料导热率对U型埋管换热器换热性能的影响。结果表明:强化换热型回填材料可以大幅度提高钻井换热器的换热能力,钻井的换热能力随着回填材料导热率的增加而不断提高,但回填材料导热率并非越高越好,而是应该稍高于钻井周围岩土层的导热率。
The objective of this paper is to study the effect of backfill thermal conductivity on vertical ground heat exchanger performance. A numerical model for the simulation of transient heat transfer in vertical ground heat exchanger is presented. The influence of backfill on borehole heat exchanger is investigated. It can be concluded that the utilization of thermally enhanced backfill offer better system performance and the backfill thermal conductivity should be selected according to the local soil thermal properties rather than some certain value.
出处
《建筑热能通风空调》
2007年第4期64-67,共4页
Building Energy & Environment
基金
国家自然科学基金项目(50408019)
教育部新世纪优秀人才支持计划项目(NCET-05-0688)
霍英东教育基金会高等院校青年教师优选资助课题(104006)
关键词
土壤耦合热泵
埋管换热器
回填材料
ground-coupled heat pump, borehole heat exchanger, backfill
