Seepage And Heat Transfer Of Beachwell Infiltration Intake System In Seawater Source Heat Pump

Tianjin Bohai Sea has a lower surface temperature compared with the air andwater temperature changes obviously in the depth direction in summer. Tianjin BohaiSea has a low temperature in winter and sea freezes for a short period. Tianjin coastalwater quality is bad. Taking the above reasons into consideration, Tianjin coastal areasmight not be a suitable sink or heat source for heat pump system. Seawater sourceheat pump using beachwell infiltration intake technology is a heat pump system whichcomprehensively makes use of ocean thermal energy and soil thermal energy andhelps to solve the problems mentioned above. Under this premise, the seepage andheat transfer of Beachwell infiltration intake system is studied in this article.Firstly, Tianjin Bohai sea temperature and shallow layer ground temperature ismeasured, and coastal geology is prospected. The possibility of installing beachwellinfiltration intake systems is expounded in Tianjin coastal areas. Through reasonableassumptions and combining with the common groundwater seepage and heat transfermodel, the mathematical model of Beachwell infiltration intake systems isestablished，including the governing equations and its single valued conditions. Fluent,a software used for solving the equations, is introduced.Secondly, thermal conductivity and porosity of the aquifer are determined bynumerical methods, and further the accuracy of the model and its applicability inbounded aquifer are validated by using team field pumping experiments conducted bythe research group, basic data such as seepage coefficient, seawater temperature,beachwell pumping water temperature variation which are obtained by testinglaboratory water samples and soil samples.Thirdly, the verified beachwell infiltration intake seepage and heat transfermodel of bounded aquifer is used. Taking practical engineering hydrogeologicalconditions into account, how locations and diameters of coastal wells and drawdowninfluence the well water yield are simulated and studied, and further how seawatertemperature, pumping time, well water yield and well structure parameters influencethe water temperature in the outlet are simulated and researched.Finally, annual cost method is used to optimize the design of the beachwellinfiltration intake technology in seawater source heat pump engineering to determinethe position of the coast well, the number and diameter of the coast well. The proportion of energy from soil and seawater was calculated through analyzing ofseawater source heat pump which used beachwell infiltration intake technology. Thequality of the sea water and well water is tested and analyzed. The infiltration intakewater quality is evaluated, considering corrosion of the heat exchanger. The testresults show that beachwell infiltration intake systems have a better water quality,which can help us to reduce the corrosion of the heat exchanger caused by waterquality.