【摘要】 为确定地下水渗流对竖直埋管地热换热器的影响,建立了多孔介质中有渗流时的换热能量方程,得到了有渗流时无限大介质中线热源温度响应的解析解。归纳得出影响这一传热过程的无量纲量,并分析了地下水渗流对地热换热器中温度场的影响。分析计算的结果表明:适度的地下水渗流对原一维温度场的影响明显。地下水渗流越大,温度场变形越显著,达到稳态的时间越短,稳态过余温度越低。更多还原

【Abstract】 In order to estimate the impact of groundwater advection on the performance of geothermal heat exchangers in ground source heat pump systems, a governing equation is established for heat transfer in porous media, and an analytical solution is obtained for a line heat source in an infinite domain by means of the Green function analysis. Dimensionless criteria that dictate the process are summarized, and influence of the ground-water flow on the heat transfer is discussed accordingly. Computations show that water advection in the porous medium alters significantly the conductive temperature distribution, results in much lower temperature rises and leads to a steady-state regime eventually.更多还原