严寒地区岩土热响应试验与地埋管地源热泵系统应用

Rock-soil thermal response test and application of ground-source heat pump in severe cold zone

结合严寒地区某工程,建立了两口120m深U形竖直埋管试验井并进行热响应试验,利用Kelvin无限长线热源理论模型计算了岩土层热物性参数及地埋管换热器的换热能力,分析了地埋管换热器的热阻特性,得出了夏季直接取冷条件下的单井取冷量与冷水温度的关系,并给出空调方案。依据土壤热平衡、初始土壤温度、地埋管换热器的换热能力及全年负荷等因素,确定了太阳能结合土壤蓄热的地埋管地源热泵系统供热供冷方案。

Combining with a ground-source heat pump project in severe cold zone, builds two vertical U-tube test wells with depth of 120 m to conduct thermal response test. By using Kelvin＇s infinite linear source model, calculates parameters of rock-soil thermal properties and capability of ground heat exchanger （GHE）. Analyses the thermal resistance characteristics for GHE. Obtains the relationship between extracting cooling capability per well and cooling water temperature under the direct heat exchange condition in summer. Puts forward air conditioning scheme. According to ground heat balance, initial rock- soil temperature, capability of GHE and the year loads, determines the heating and cooling supply schemes of solar coupled ground-source heat pump system.