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本文基于无限长线热源模型,提出了一种较简便的用于计算地埋管钻孔壁逐时动态温度的方法。以某建筑所采用的地源热泵系统中单根埋管所承受的实际负荷为例,采用该方法对地埋管钻孔壁温度变化特征进行了分析,并对目前通常采用的一种考虑动态负荷的简化方法的可靠性进行了评价。结果表明,对于单根埋管而言,其钻孔壁温度峰值与其所承受负荷的峰值所对应的时刻基本吻合;目前采用的通过月平均负荷和峰值脉冲负荷叠加来代替动态负荷的简化方法能较好地反映钻孔壁温度的整体变化趋势,但其计算得到的温度变化范围与脉冲负荷的持续时间有很大关系,持续时间选择不合理可能导致计算结果有2～3℃的误差,建议工程中选用多个持续时间值进行试算。
Based on infinite long-term heat source model, this paper presents a simpler method for calculating the hourly dynamic temperature of borehole wall. Taking the actual load of a single buried pipe in a ground source heat pump system used in a building as an example, this method is used to analyze the characteristics of the temperature variation of the borehole wall of the buried pipe, and a commonly used method to consider the dynamic The reliability of the simplified method of loading was evaluated. The results show that for a single buried pipe, the peak temperature of the borehole wall basically coincides with the moment corresponding to the peak load of the borehole. The simplified method currently used to replace the dynamic load by the monthly average load and the peak pulse load superimposition Which reflects the overall trend of borehole wall temperature better. However, the calculated range of temperature change has a great relationship with the duration of impulse load. The unreasonable choice of duration may lead to an error of 2 ~ 3 ℃ in the calculation result. The project uses multiple duration values for trial calculations.