土壤热源热泵系统垂直U形埋地换热器传热过程及合理间距的分析

Heat Transfer and Reasonable Distance Analysis for Vertical U-tubes Used in GSHP

利用传热理论 ,提出了土壤热源热泵垂直U形埋地换热器的等效换热器 ,并通过传热热阻分析 ,得到 :埋地换热器在土壤中的取热过程 ,热阻的主要成分是土壤和塑料管壁。在换热强度为单位管长 40W /m(单位埋孔长度 80W/m) ,类似上海地区的气象与地质条件下 ,对 5 0m深的埋地换热器孔中心间距至少为 5～ 6m ,才能保证换热器之间相互不受干扰。

An equivalent heat exchanger for vertical U-tubes used in GSHP(ground-source heat pump) is introduced by heat transfer theory. Based on analyzing the heat resistance of buried heat exchanger , it is shown that the thermal effects of the plastic pipe and the soil is dominant, and the reasonable distance between the vertical U-tubes is 5～6m.