埋地换热器理论模型与周围土壤温度数值模拟

提出内热源型埋地换热器理论模型，建立换热器周围土壤热湿传递物理数学模型。内热源模型综合考虑热湿迁移、土壤物性等各方面因素，将埋设于土壤中的换热器处理为等效内热源。采用专业多孔介质计算软件Autough2对模型进行模拟计算。着重模拟计算不同土壤物性、不同换热器运行方式对单根U型垂直埋管换热器周围土壤温度场影响的模拟计算与分析。

THEORETICAL MODEL OF UNDERGROUND HEAT EXCHANGER AND NUMERICAL SIMULATION ON UNDERGROUND TEMPERATURE FIELD

An inner heat source model of underground heat exchanger was introduced, and the heat and mass transfer model of underground temperature field around the underground heat exchanger was set up. A number of factors, such as soil heat and moisture movement and soil property were taken into account in the inner heat source model, and the underground heat exchanger was regarded as the equivalent inner heat source term in the model. Professional porous medium software of Autough2 was used to carry out the numerical simulation study. The paper emphasized the analysis of the influences of different properties of soils and different operation modes to the ground temperature field around the single U-pipe underground exchanger.