杭州地区大型地源热泵系统全年运行性能研究

Research on Annual Operation Performance of Large Scale Ground Source Heat Pumps in Hangzhou

本文以杭州地区某高层建筑地源热泵系统为实验平台,对全年一个完整的供冷、供暖周期内地源热泵的运行性能进行了测试分析。运行结果表明,在杭州市的气候条件下,该地源热泵系统机组平均COP为供冷季5.0、供暖季4.5。通过定量分析机组和水泵能耗,发现本系统水泵能耗占整个系统的能耗比达到40%以上;通过定量分析该地源热泵系统与土壤间的传热量,验证了长江三角洲地区地源热泵系统与土壤间的热交换不平衡现象,该系统全年热不平衡率为35.4%,由此可能产生"热堆积"现象。最后,本文对如何研究"热堆积"对周围环境的影响做出了展望,并对改善系统运行性能提出了几点建议。

The annual operating performance of ground source heat pump system(GSHPs)applied in a high-rise office building was tested and analyzed.The actual operation results show that the average COP(Coefficient of Performance)of heat pump units is5.0in cooling season and4.5in heating season.The result of analysis shows that the water pump accounts for a great proportion of system power consumption(40%).In addition,from a quantitative analysis of heat transfer between the GSHPs and the ground,the total heat absorbed from the soil would be lower than that rejected to the soil by35.4%during the one year operation and the heat unbalance between GSHPs and soil which may lead to“heat accumulation”in the Yangtze River Delta region has been validated.Finally,some suggestions are given to investigate the influence of“heat accumulation”to the environment,so as to improve the system performance.