为探究地埋管设计参数对系统储热特性的影响,建立了W型地埋管跨季节储热系统数值仿真模型,分析了入口温度、流速、井间距及有效埋深等因素对储热性能的作用机制。研究表明:地下温度场在跨季节储热过程中沿径向变化最为显著;地埋管内循环流体的最佳流速为0.6 m/s时,可实现储热效率与能耗的平衡;提升系统入口流体温度虽能增大管内温度波动范围,但同时也加剧了热损失;正六边形管群布局下,最佳井间距随地埋管深度的增加而增加。该研究成果可为地埋管跨季节储热系统设计和优化提供理论依据。
To explore the impact of buried pipe design parameters on thermal storage, a numerical simulation model for W-type buried pipe cross-seasonal thermal storage systems was developed, and the effects of inlet temperature, velocity, well spacing, and burial depth on thermal storage performance were analyzed. The study shows that the underground temperature field changes most significantly along the radial direction during cross-seasonal thermal storage. A velocity of 0.6 m/s is optimal for the circulating fluid in the buried pipe as it balances thermal storage efficiency and energy consumption. Increasing the inlet fluid temperature of the system widens the temperature fluctuation range within the pipe but also increases heat loss. Under a hexagonal tube cluster layout, the optimal well spacing increases with the depth of the buried pipe. The research findings provide a theoretical basis for the design and optimization of cross-seasonal thermal storage systems of buried pipes.
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