Figure 13
The vertical axis lists number of loops, concrete thermal conductivity, average soil thermal conductivity, pile diameter, fluid velocity, pile length, heat flux and initial temperature. The horizontal axis represents the fraction of total mean absolute Shapley additive explanations from 0.0 to 0.7. On Day 1, the wall fraction is highest for pile diameter at about 0.64, followed by average soil thermal conductivity at about 0.27. The outlet fraction is highest for number of loops at about 0.35 and concrete thermal conductivity at about 0.31. On Day 1000, the wall fraction remains highest for pile diameter at about 0.42, followed by pile length at about 0.24. The outlet fraction is highest for number of loops at about 0.32 and concrete thermal conductivity at about 0.29. Other wall and outlet fractions remain below about 0.14.Normalised mean SHAP values for the wall and outlet thermal response surrogate for Days 1 and 1000