【摘要】 为了使U型竖埋管传热模型更接近实际,在U型管建模时,考虑了其实际形状.对土壤建模时,把土壤进行了分层处理,把土壤看作是固态、液态、气态并存的物质,推导了各传热环节的控制方程,比较了不同温度场各因素的变化引起温度场的变化趋势.结果表明,非饱和土壤温度场更接近实际情况.更多还原

【Abstract】 A new model of U-pipe vertical heat exchanger is established in this paper.When model of U-tube established,its real shape is considered.While model of ground established,its property of solid,liquid and gas are all included,besides,ground is divided into three different layers.The control equations of heat transfer have been deduced out,and the trends caused by the change of the factors of different temperuture field is compared.Differrent temperature field are compared to analysis the effects of differrent conditions.更多还原