提高地能利用的强化传热试验研究

以太阳辐射积聚大量能量和冷热良性循环蓄集巨大能量的地下是一个庞大的可再生能源库，也是一项可充分利用的自然能量资源。该文介绍了在地源热泵系统中开展的地下100m和200m竖直井闭式循环传热的研究工作，提出利用地下螺旋芯管束新方法，加强旋流流动，提高地下换热能力。试验表明，在放热和吸热过程中，传热均得到显著提高。所提出的可控制间歇过程，将充分发挥换热井的换热能力，实现最少的井数布置，保证良好的地源热泵机组运行工况。

ENHANCED HEAT TRANSFER FOR INCREASING UTILIZATION OF GROUND ENERGY

Underground frame is a gigantic resource of renewable energy which absorbs solar energy and a heating or cooling storage body. Ground Source Heat Pump (GSHP) are recognized to be a outstanding heating and cooling system to use the ground energy. This paper described efforts recently undertaken to explore heat transfer enhancement of ground heat exchangers,in vertical boreholes (100m,200m deep) of closed loop GSHP in a testing field. A new technology of the screw core tube bundle in ground heat exchangers was presented to disturb the flow and enhance heat transfer,and experimental results show both increase of heat transfer to and from the ground loop heat exchanger. A method of using intermittent process to make better use of ground energy and to decrease the number of the heat transfer well in GSHP system and to keep better working condition of GSHP was presented.