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基于无限长线热源模型,推导了以年为周期的逐时负荷作用下地埋管周围土壤逐时温度分布的计算公式。以某典型建筑为例,采用该方法计算了负荷不平衡条件下系统运行50a期间地埋管钻孔壁的温度变化,分别比较了不同地埋管间距和数量及不同负荷不平衡率下地埋管的换热效率。结果表明,冷热负荷不平衡对单根地埋管换热性能的影响不大,但使地埋管对周围土壤的影响范围变大,由此带来的后果是多根地埋管组成的地下换热系统通常只能有效运行若干年;增大地埋管间距和数量对降低冷热负荷不平衡影响的作用有限,降低冷热负荷不平衡率是最直接和有效的方法。
Based on the infinite-length heat source model, the formula for calculating the hourly temperature distribution around the buried pipe under the period-by-hour load is deduced. Taking a typical building as an example, this method was used to calculate the temperature change of the borehole wall of the buried pipe during the 50-year operation under load imbalance. The differences between the buried pipe spacing and the number of different buried pipelines and the unbalanced load of the buried pipe The heat transfer efficiency. The results show that the thermal load imbalance has little effect on the heat transfer performance of a single buried pipe, but the influence of the buried pipe on the surrounding soil becomes larger. The consequence is that the buried pipe The underground heat exchange system usually can only run effectively for several years. Increasing the spacing and quantity of buried pipes has a limited effect on reducing the imbalance of heat and cold load. It is the most direct and effective method to reduce the imbalance rate of heat and cold load.