单井回灌地源热泵地下传热数值模型研究

在空间上将单井回灌系统地下传热问题分为井内与井外两部分,通过有限容积法(FVM)分别建立了井内与井外传热的数值模型。利用该数值模型对单井回灌系统的一些重要参数进行了研究,发现热传导和热对流是单井回灌地热换热器的主要传热方式,凡是影响热传导和热对流的地质参数和系统参数都对换热器的传热性能有明显影响。此外,利用现场测试的数据验证了计算结果的有效性。

STUDY ON NUMERICAL HEAT TRANSFER MODELS OF STANDING COLUMN WELL

The standing column well(SCW)is a new technology with high efficiency and environmental benefit,where groundwater is drawn from the bottom of a well and then reinjected to its top after transferring heat with heat pumps.Heat transfer analysis in the ground and aquifer involves complex problems in such a system.The heat transfer problems in SCW were divided into two spatial parts according to the characteristics of its heat transfer.The detailed numerical models of heat transfer both within and out of well were built.Some important parameters also were investigated by the numerical models.The research results indicate that heat conduction and heat convection are the most important heat transfer mech- anism in the SCW system.The properties of aquifer and design parameters which have influence on heat conduction and heat convection all have evident influence on the heat transfer performance.Moreover,the validity of compution results was verified by the in-situ measuring data.