土壤源热泵地埋管换热实验研究

在不同的钻井和埋管结构中，利用实验装置及测试系统运行不同地埋管进水温度、进水流速等数种工况，根据土壤源热泵地埋管实际运行的测试结果讨论地埋管进水温度、流量、埋管类型、钻井深度以及运行方式对单位井深换热量的影响。实验表明，提高进水温度、流量、钻井深度以及选择合适的埋管类型可增强地埋管换热能力，间歇运行方式能够最大程度利用土壤蓄能特性，使地埋管始终能够高效换热，相比连续运行提高了33．9％，但进水温度、流量和钻井深度不能无限增大，其大小的选择需要考虑土壤源热泵主机运行性能和经济性。

Experimental Study on Ground Heat Exchangers Heat Transfer in Ground Source Heat Pumps

The experimental apparatus and test systems were conducted to run several conditions including different water inlet temperature,and flow capacity with the dissimilar borehole and ground heat exchanger structures.The experimental studies were carried out for the heat exchange capacity unit borehole depth as a function of water inlet temperature,flow quantity,pipe shape,borehole depth and operational mode.The investigations show that increasing the water entering temperature,flow rate and borehole depth and selecting reasonable pipe figure can improve the heat transfer capability of ground heat exchangers.Meanwhile employing intermittent operation mode in which energy storage characteristic may be furthest utilized to maintain the high performance of ground heat exchangers at a improved value of 33.9% compared with the continuous service condition.However,the water inlet temperature,flow capacity and borehole depth can not be increased unrestrictedly,and their magnitude should meet the need of operational performance and economy for heat pump units.