中深层套管换热器取热影响因素研究现状

A Comprehensive Review on Influencing Factors of Heat Transfer in Medium and Deep Coaxial Heat Exchanger

随着日常生活中人们对用热量需求的增大,人们开始探索更加有效的提取地热的方法。虽然浅层地源热泵系统相比于传统的空气源热泵系统节能环保、能效高且节省空间,但为了使得地源侧达到全年的热量平衡,需要冬取夏灌,管群较为庞大,尤其是冬季用热负荷较大的寒冷地区这一问题更加突出。中深层地源热泵深度较深,单井换热效率高,能有效解决上述冷热不平衡的问题,因此中深层地源热泵近年来得到广泛重视。对近年来中深层套管换热器中有关循环工质、钻孔构造尺寸和外部影响因素的研究进行综述,总结了现阶段中深层套管换热器换热因素研究的不足之处,对未来中深层套管换热器的研究进行了展望。

With the increasing demand for thermal energy in daily life,people began to explore more effective methods of extracting geothermal energy.Although the shallow ground source heat pump system has the advantages of energy saving,environmental protection,high energy efficiency and saving space compared with the traditional air source heat pump system,it also needs to take heat in winter and dissipate heat in summer with more pipe groups to achieve the year-round heat balance on the ground source side,especially in the winter heat load in cold regions of China.With the advantages of large single well depth and high heat exchange efficiency,the deep ground source heat pump can effectively solve the above-mentioned cold-heat imbalance.Therefore,deep ground source heat pumps have received extensive attention in recent years.This article summarizes the research on circulating working fluids,drilling structure size and external factors in the medium and deep casing heat exchangers in recent years,and does a review of the shortcomings of the current research on the heat exchange factors of medium and deep casing heat exchangers.