Abstract
Targeting the heat transfer performance of energy pile in ground source heat pump system (GSHP), the physical models of the single energy pile and the 3*3 energy piles in the surrounding soil were established. CFD software was used to simulate heat transfer processes based on the Finite Element Method. In cooling mode, heat transfer rate (Q, W•m-1) gradually decreases and eventually stabilizes at around 60 W•m-1 with system running for one month. For the 3*3 energy piles, the average temperature of the whole soil zone decreases by about 0.030℃ after a complete cycle of one year. In general, heat extraction from and injection into the soil can keep balanced, and intermission periods during spring and autumn can promote the recovery of soil temperature. Simulation results can be used as theoretical basis for the design of the Energy Pile GSHP.
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