地源热泵非连续过程地下传热特性及其控制

通过试验和模拟计算,研究了地源热泵在地能利用中实施非连续运行操作过程的地下温度变化规律,并对可变负荷间歇过程进行了研究,指出负荷周期调节可以实现地温变化趋势的控制。通过控制地温变化可使热泵机组运行在有利的温度工况下,提高地源热泵系统的运行性能系数。利用空调系统的经常性非连续运行特点,实现有效的非连续性控制对未来利用地能具有重要的应用价值。

Underground heat transfer characteristics in discontinuous operation of GSHP and its control strategy

The underground heat transfer during the discontinuous operation in the earth energy utilization in the ground source heat pump(GSHP) was studied by experiments and simulations.The intermittent processes with variable loads were investigated and results showed that regulating the load cycle can realize the control of the underground temperature distribution.The underground temperature can be restored during the operation intermittence due to providing an additional time for underground heat transfer and supplementing timely the surrounding energy to the tested area,thus the GSHP may work under more favorable conditions with larger heat extraction capacity and higher coefficient of performance.Making use of the character of regularly intermittent process of the air-conditioning system,effective intermittent operation control of the GSHP is significant for the future earth energy utilization.