地埋管内空气与埋层传热的数值模型*
Numerical model for heat transfer between air and buried layer in buried tubes
摘要：
建立了单层埋管单向流动地道风换热器的物理数学模型，集成了岩土温度的二维非稳态导热显式数值模型及空气温度和含湿量的一维对流-扩散隐式数值模型。采用有限体积法进行空间离散，管内空气计算参数采用逆风格式。提出了依次计算空气湿度、计算空气温度、修正空气湿度、计算岩土温度的顺序算法。该模型既适用于浅埋也适用于深埋系统。用深埋地道实测数据验证了该模型的准确性。
Abstract：
Establishes a physical and mathematical model of earth-air heat exchangers (EAHE) with single layer buried tube and unidirectional flow. Integrates the two-dimensional unsteady heat conduction explicit numerical model for soil temperature and the one-dimensional convection-diffusion implicit numerical model for air temperature and moisture content. Adopts the finite volume method for spatial discretization and calculates the air parameters in the tube by the upwind scheme. Proposes a sequential algorithm for calculating air humidity, calculating air temperature, correcting air humidity and calculating soil temperature. The model is suitable for both shallow and deep buried systems. Verifies the accuracy of the model by the measured data of the deep buried tunnel.
Keywords:earth-air heat exchanger (EAHE), buried tube, soil temperature, air temperature, air humidity, heat transfer, numerical model, sequential algorithm