岩土蓄能周期负荷能流控制特性研究

DYNAMIC CONTROL OF PERIODICAL LOAD IN UNDERGROUND THERMAL ENERGY STORAGE

针对地下蓄能动态控制能流特性与能量保持作用开展研究,在建立大型热源群计算模型的基础上,探索岩土蓄能负荷周期动态控制温变特性和能流特征。通过分析平均温升和最高温度的温变规律以及能量传输能力和边界热流密度可知,地下蓄能负荷分配的温位幅值分布、间歇周期和循环间断周期等不但对蓄能加热期具有明显作用,对于蓄能后保持期的能量扩散也将有一定影响,通过可控性扩散传输,可达到促进蓄能和抑制所蓄能量流失的目的。其中,昼夜性间歇比全日性间歇蓄能更有效,短间歇蓄能周期更加有利。研究结果表明,负荷动态性控制选择,将有利于寻求最佳的蓄能综合效果。

Effects and roles of dynamic intermittent control in underground thermal energy storage （UTES） were investigated computationally, and the comparison of energy transport and protection through sharing load in ground heat exchangers was obtained based on establishing a large scale numerical model of multi-heat source. Further- more, the average temperature increment, maximum temperature, energy injection and protection, and borderline energy flux in the field were analyzed by numerical methods. The results show that the semi-day intermittent mode is more effective than the full-day intermittent mode, and the shorter intermittent period is more favorable. In UTES some control parameters, such as the temperature amplitude, intermittent period, rest cycle were employed to con- figure the dynamic underground temperature distribution. Forming real-time variable temperature not only has the obvious effect on the heat injection, but also plays a big influence to heat protection with controllable diffusion transfer. Thus the sharing load expedites the heat injection and downsizes heat the loss. The results show that a reasonable selection of dynamic load mode witl lead to beneficial and effective energy transfer.