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根据上海地区某实际工程的实测数据,将土层概化为7层,并建立了物理模型。对冷热负荷不平衡条件下地源热泵系统运行10a后的换热区土壤温度场特征进行了模拟分析。结果表明,10a后换热区平均土壤温度升高约2.44℃,土壤温度升幅随土层深度的增加逐渐减小;换热区热扩散半径随时间呈直线增加,10a后平均热扩散半径为20m左右,浅部土层热扩散半径较大。
According to the actual data of an actual project in Shanghai, the soil layer is generalized into seven layers and a physical model is established. The characteristics of soil temperature field in the heat exchange zone after 10-year operation of ground-source heat pump system under the condition of unbalanced cooling load and heat load were simulated. The results showed that after 10a, the average soil temperature increased about 2.44 ℃, and the increase of soil temperature decreased with the increase of soil depth. The heat diffusion radius increased linearly with time, and the average thermal diffusivity was 10m The thermal diffusivities of shallow and shallow soil are larger.