杭州某地埋管地源热泵系统性能与地温场监测分析

Monitoring and analysis of ground temperature field for a ground source heat pump system in Hangzhou

以杭州市某实际工程为例,对地埋管地源热泵系统长期运行过程中的系统性能和地温场进行了监测,分析了影响系统制冷能效的主要因素,以及不同位置、不同深度处地温(地温场)的变化规律。结果表明,该地源热泵系统制冷季能效比在两个制冷周期内分别为3.30和3.76,其中系统负荷率(实际负荷/额定负荷)、水泵功耗比(水泵功耗/系统功耗)对系统制冷能效影响较大;系统热不平衡率达86.5%。经过一个完整的制冷季-过渡季-制热季-过渡季,位于4个地埋管换热孔中心的地温监测孔内平均温度年升高0.12℃,地温基本保持平衡,这与场地内存在较强的地下水渗流有关。要揭示地下水渗流对地温场的影响规律还需作深入细致的研究工作。

Taking a practical project in Hangzhou as an example,the system performance and ground temperature field of a ground source heat pump system are monitored during the long-term operation,and the main factors affecting coefficient of cooling performance of the system and the variation law of ground temperature field area nalyzed.Itisshown that,coefficient of cooling performance of the system is 3.30 and 3.76 respectively in the first and second cooling season,in which the load rate(actual load/rated load)of heat pump system and pump power consumption rate(pump power consumption/system pow⁃er consumption)have a great influence on the system cooling efficiency;The system heat imbalance rate is 86.5%.After a complete cooling season-transition season-heating season-and transition season,the average temperature in the ground tem⁃perature monitoring borehole at the center of the four vertical ground heat exchange boreholes increases by 0.12℃per year,and the ground temperature is basically balanced,which is related to the strong groundwater seepage in the site.Fur⁃ther and detailed research is needed to reveal the influence law of the groundwater seepage on the ground temperature field.