竖直U型管地热换热器的准三维传热模型

A Quasi Three-dimensional Heat Transfer Model for Vertical U-Tube Geothermal Heat Exchangers

在地热换热器原有研究工作的基础上,进一步考虑流体工质在钻孔深度方向上的温度分布,分析竖直埋管地热换热器钻孔内的传热过程,导出了竖直埋管地热换热器效能的解析式。由此,可以抛弃以往简化模型当中的不合理假设,为地热换热器的设计和模拟提供了更加精确合理的理论基础和计算方法。

In pursuit of a more advanced study of ground source heat exchangers the temperature distribution of fluid working media along borehole depth direction was investigated. By analyzing the heat transfer process in the borehole of a vertical embedded tube geothermal heat exchanger derived was an analytical expression of the efficiency of the said exchanger. Thus, it is possible to abandon the irrational assumptions contained in former simplified models and provide a more accurate and rational theoretical basis as well as a calculation method for the design and simulation of geothermal heat exchangers.