双圆柱坐标下垂直埋管土壤热湿耦合迁移理论模型与数值模拟

THEORETICAL MODEL AND SIMULATION ON HEAT AND MOISTURE TRANSFER AROUND U-VERTICAL UNDERGROUND HEAT EXCHANGER IN DOUBLE CYLINDER COORDINATES

以土壤热湿迁移理论为基础,建立双圆柱坐标系下U型垂直埋地换热器周围土壤内三维非稳态热湿耦合迁移模型,并考虑土壤内热湿迁移的相互影响,编制相应的计算软件。进行不同土壤物性、不同运行工况、不同初始含湿量对U型垂直埋地换热器周围土壤内热湿迁移影响的研究。将模拟值与实验结果进行比较,表明该模型可用于实际应用的模拟分析。

Based on the heat and mass transfer theory in soil, an unsteady three-dimensional coupled heat and moisture transfer model for the U-vertical underground heat exchanger in soil was set up in double cylinder coordinate system, and the compilation of calculation software was accomplished. According to the model, analyses were presented about the influences of various soil properties, different operational modes, and different initial humidity＇s on the temperature and moisture fields around the U-vertical underground heat exchanger in soil. The comparison between the simulation and experiment results demonstrated that the model is turned out to be valid in practical application.