Vertical BHE effect on heat pump system efficiency [closed]

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I have a model of ground source heat pump system with vertical borehole heat exchangers drilled until 120 m and i am trying to vary parameters of the borehole systems such as depth, diameter and flow rate of circulating fluid, but the consumption of the heat pump and the building seems to have very small sensitivity to those parameters. Anyone has an idea of better variables that might be better to analyze the effect of the BHE parameters of the system efficiency.