Abstract
This study presents a novel analytical model for ground source heat pump (GSHP) which comprehensively considers the dynamic interaction between building load, borehole heat exchanger (BHE) and heat pump unit, and the BHE under groundwater seepage and layered subsurface coupling conditions, as well as the impact of seasonal ground temperature fluctuation. The model achieved comprehensively reflect the influence of complex geological condition, interaction of unit system and seasonal fluctuation on GHSP performance. The model is utilized to simulate and analyze the long-term dynamic performance and the evaluation index (SCOP) is introduced to evaluate it, the results indicate that, after the 20 years of operation, the SCOP decreases by 9.1% from 4.81 to 4.37. Moreover, by analyzing the influence of load variation on outlet liquid temperature, it can find that the maximum value of the outlet temperature of the circulating fluid and the building cooling load appear at different times, with a difference of 44 days. Finally, the effect of seepage and seasonal ground temperature fluctuates on GSHP performance is investigated, the results reveal that the seepage effect is beneficial to it, and the seasonal ground temperature fluctuate will have an adverse effect on it.
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