摘要
随着供暖需求的不断增加,研究者开始探索利用地热能的更好方式。与中深层地源热泵相比,浅层地源热泵中的能量桩在良好换热效率的基础上,忽略了钻井过程,不需要占用额外的地下空间,可以与地下工程结构配合,解决了地源热泵系统在城市中占地广、造价高的两大主要问题。综述了能量桩换热影响因素(管型、循环介质流速、桩间距、地下水渗流、间歇运行方式以及土壤类型)的研究进展。研究发现,螺旋型管型的换热面积最大,换热效率最佳;循环介质的流速一般只需确保其流动状态为湍流;桩间距越大换热效果越好;比热容小的土壤,热干扰明显,传热效率降低;间歇循环较持续运行模式换热效率值相对更大。在此基础上,提出了能量桩下一步的研究建议和展望。
With the increasing demand for heating,researcher are exploring better ways to utilize geothermal energy.Compared with medium and deep ground source heat pumps,energy piles in shallow ground source heat pumps ignore the drilling process based on good heat transfer efficiency,do not need to occupy additional underground space,and can work with underground engineering structures,which solve two major problems of ground source heat pump systems covering a wide area and high cost in cities.The research progress on the factors influencing heat transfer in energy piles(tube type,circulating medium flow rate,pile spacing,groundwater seepage,intermittent operation mode,and soil type) are reviewd.It is found that the spiral tube type has the largest heat transfer area and the best heat transfer efficiency,the flow rate of the circulating medium generally only needs to ensure that its flow state is turbulent,the larger the pile spacing the better the heat transfer effect.The soil with small specific heat capacity has obvious thermal interference and reduced heat transfer efficiency,the intermittent cycle has relatively larger heat transfer efficiency values than the continuous operation mode.On this basis,the next research suggestions and outlook of energy piles are proposed.
作者
贾永英
赵雅仙
刘晓燕
方志文
张川
JIA Yongying;ZHAO Yaxian;LIU Xiaoyan;FANG Zhiwen;ZHANG Chuan(School of Mechanical Science and Engineering,Northeast Petroleum University,Daqing 163318,Heilongjiang,China)
出处
《能源化工》
CAS
2024年第3期7-11,共5页
Energy Chemical Industry
基金
国家自然科学基金资助项目(52076036)。
关键词
地源热泵
地埋管
能量桩
传热性能
ground source heat pump
buried pipe
energy pile
heat transfer performance
