摘要
地源热泵地埋管换热器的换热性能直接决定着整个系统性能的优良与否,它与地层岩性、水文地质条件、钻孔回填材料的性能、钻孔直径、孔深以及埋管直径等诸多因素有关。合理地确定地埋管间距,不仅可以增强换热效果,还可以减小换热器相互之间的热干扰,从而提高地源热泵系统的整体性能。本文在延长加热时间的热响应试验基础上,通过在土壤中布设大量的地温传感器来研究其热扩散半径,并采用数值模拟技术获取了热扩散半径的变化规律,以为地源热泵系统地埋管间距的合理确定提供指导。
The performance of the borehole heat exchanger of ground source heat pump directly decides the performance of whole system,and it is related to such factors as stratigraphic lithology, hydrogeological conditions,the properties of backfill material, the diameter and depth of the borehole, the diameter of the PE pipe, etc. Reasonable space between borehole heat exchangers can not only enhance heat transfer effect, but also decrease the thermal interference, which will improve the overall system performance. Based on the thermal response test of prolonged heating time, by fixing up a number of earth temperature sen sors, this paper studies the thermal diffusion radius to determine the space between borehole heat exchang ers and adopts numerical simulation to discuss the variation law of thermal diffusion radius. The study pro vides references for the layout of borehole heat exchangers of ground source heat pump.
出处
《安全与环境工程》
CAS
北大核心
2013年第4期5-10,共6页
Safety and Environmental Engineering
基金
国家地质调查局项目(2012054002)
关键词
地源热泵
地埋管换热器
热扩散半径
地埋管间距
热响应试验
ground source heat pump
borehole heat exchanger
thermal diffusion radius
space betweenborehole heat exchangers
thermal response test
