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针对土壤源热泵和太阳能跨季蓄热优化匹配问题,在土壤全年热平衡基础上,建立土壤热过程数学模型。通过数值计算,分析土壤沿径向和轴向的热响应规律以及土壤在不同蓄热量和热流量下的周期热响应特性。研究表明:土壤温度在每个季节的前10天波动最大;系统运行一个年周期后土壤热作用半径约为2.5 m,钻孔间距宜设为5 m;夏、秋、冬、春季热流比例为4.5∶1∶-4∶0时,土壤温度几乎完全恢复;在土壤蓄、释热比例保持不变的前提下,钻孔与土壤换热量的变化对土壤温度恢复速率的影响不大。
In order to optimize the matching of ground-source heat pump and solar energy across the season, a mathematical model of the soil thermal process was established based on the annual heat balance of the soil. Through numerical calculations, the thermal response laws of the soil along the radial and axial directions and the periodic thermal response characteristics of the soil under different heat storage and heat fluxes were analyzed. The study shows that the soil temperature fluctuates most in the first 10 days of each season; the soil thermal radius is about 2.5 m after one year of system operation; the drilling distance should be set to 5 m; the heat flow ratio in summer, autumn, winter, and spring is At the temperature of 4.5:1∶-4:0, the soil temperature recovered almost completely. Under the premise that the ratio of soil storage and heat release remained the same, the changes in the heat exchange between the borehole and the soil had little effect on the soil temperature recovery rate.