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dc.contributorDepartment of Building Services Engineeringen_US
dc.creatorWang, Deqi-
dc.publisherHong Kong Polytechnic University-
dc.rightsAll rights reserveden_US
dc.titleNumerical thermal investigation on pile ground heat exchangers with groundwater seepageen_US
dcterms.abstractWith widespread application of ground-sourced heat pump systems, more and more individuals and organizations are committed to system development and analysis. However, little numerical simulations and experiments were conducted to research the impact of groundwater seepage on the thermal performance of the pile ground heat exchangers (PGHE) of a ground coupled heat pump system and it is hardly to find relative analytical-models which are taken seepage effect into consideration in modeling process. Therefore, in this study, a 3-D transient numerical model, which is verified by ring-coil heat source model, is established to investigate the thermal performance of the spiral-coil PGHE with groundwater seepage. Particularly, it is focus on the influences of hydraulic gradient and inner structure of soil on the heat exchange rate of the PGHE system by means of a numerical model in the porous medium. According to the simulation results, the seepage flow greatly enhances the heat transfer performance of the geothermal heat exchangers. The strengthening effect is proportional to the hydraulic gradient and is found more obvious on the spiral coil system than the U-tube system. Besides, with the porosity as reference parameter, the heat exchange rate will increase with the porosity increase and the soil structure also impacts the thermal influencing radius of PGHE system with larger influencing scope found at lower porosity.en_US
dcterms.extentxi, 80 leaves : ill. (some col.) ; 30 cm.en_US
dcterms.educationalLevelAll Masteren_US
dcterms.LCSHGround source heat pump systems.en_US
dcterms.LCSHHong Kong Polytechnic University -- Dissertationsen_US
dcterms.accessRightsrestricted accessen_US

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