岩土地质结构热物性对地下蓄能影响分析

Influence of Geological Thermal Property of Rock- soil on the Underground Thermal Energy Storage

为了提升地下蓄热能力,探讨不同岩土地质结构材料对地下蓄能效果的影响。采用地下换热器群的多热源传热数值计算方法,分析了地下岩土地质结构热物性参数对地下蓄能岩土温变性和温度分布状态变化的影响,明确有关因素的影响程度和敏感度。结果表明地下岩土蓄能体的导热系数和体积比热对地下蓄能效果具有显著的敏感性,分别决定了蓄入周期内能量的扩散能力和存储能力。研究结果还表明,热物性对蓄能的能量品位具有显著的影响作用;而且,由于其明显的影响程度,导致热物性参数偏差将对地下换热器系统设计产生直接的影响。

In order to further enhance the capacity of the underground thermal energy storage, the influence of geological thermal property of rock - soil on the underground thermal energy storage （UTES） was investigated Through the numerical heat transfer computation on the multiple heat resources of ground heat exchanger, temperature variety and distribution status of underground rock - soil, based on geological thermal property parameters, were studied, and the influence intensity and the sensitivity of these param- eters were identified. However, the geological thermal property of the storage body in the underground rock -soil, such as heat conductivity and special volume heat are essential and crucial to the storage effi- ciency. The heat conductivity and the special volume heat directly impact the heat diffusion and trans- port, and energy capacity respectively. Results also indicat that geological thermal property plays an important role in the requirement of the quality and level of energy provided for the UTES. Furthermore, the error and departure of determining parameters result in a direct affect on the design of ground heat exchangers due to a big sensitivity.