某中深层地埋管地源热泵系统测试与分析

The measurement and analysis for a medium-depth geothermal heat pump system

中深层地热“取热不取水”技术是中深层地埋管地源热泵系统的核心,是影响整个系统设计与性能的主要因素。为了更全面地认识中深层地埋管地源热泵系统性能,本文对位于陕西省某矿区的孔深为3183 m的中深层地埋管地源热泵系统进行了测试,测试参数包括地下岩土层初始平均温度、地热井取热能力、热泵系统运行工况参数及系统冬季性能系数,获得了部分数据,并对结果进行了分析。通过分析可知,该地热井井底初始温度为107℃,不同深度地下温度的平均温度约70℃;单位管长换热量为217.4 W/m,在供水温度为70℃,采用散热片为末端,供暖部分负荷率约为25%时,系统性能系数为1.99。本文研究可为中深层地埋管地源热泵系统设计及运行提供参考。

The technology of“taking heat without taking water”in medium-deep geothermal heat pump system is the core and the main factor affecting the performance and design of the whole system.To get a more comprehensive understanding of the medium-deep geothermal heat pump system performance,in this paper,the testing of medium-depth geothermal heat pump system is of great significance to guide the design and operation of the system.The measurement for a medium-depth geothermal heat pump system with depth of 3183 m in Shanxi Province are made,including the average initial soil temperature,heat exchange capacity and operation parameters.Some results and data are obtained and analyzed.The initial bottom hole temperature is 107℃.The average initial soil temperature is about 70℃.The heat exchange capacity per length of tube is 217.4 W/m.The coefficient of performance of the system is about 1.99 when partial load rate is about 25%,with 70℃of supply water temperature and radiator terminal.The research can provide reference for system design and operation.