地埋管换热器分区运行对地源热泵系统运行经济性影响的模拟研究

针对管群地埋管换热器,在不同夏冬季建筑负荷比运行条件下,对一种简单分区运行与不分区运行方式的循环水温度变化及系统能耗情况进行对比。结果表明:与不分区运行相比,采用简单分区运行方式时,地埋管循环水温度随运行时间的变化幅度相对较小,能耗降低,节能率随运行时间的增加而增大;随着夏冬季负荷比的增大,分区运行节能效果呈先增大后减小的趋势。研究结果表明,对于冬夏季负荷不平衡时,采用简单的地埋管换热器分区运行方式,可提升系统运行效益及可靠性。

INFLUENCE OF GROUND HEAT EXCHANGER ZONING OPERATION ON OPERATION ECONOMY OF GROUND SOURCE HEAT PUMP SYSTEMS

In this paper,the circulating water temperature variation and energy consumption of ground source heat pump systems with their ground heat exchangers running in a simple zoning mode are calculated and compared with those in non-zoning operation mode.The results show that the temperature rise or drop of circulating water in buried pipes and the energy consumption in zoning operation mode are relatively lower compared with those in non-zoning operation mode.The results also indicate that the energy saving rate increases with the increase of operation time in zoning operation mode.With the increase of seasonal load ratio,the energy saving rate does not vary monotonically,which increases first and then decreases.The research suggests that when the seasonal thermal load is unbalanced,the simple zoning operation of ground heat exchanger can effectively improve the system operation efficiency and enhance the system operation reliability.