Thermal resistance analysis of an energy pile and adjacent soil using radial temperature gradients

This paper examines the thermal resistances of energy piles and surrounding soils. A field-scale bored pile was installed through stiff sandy clay dense sand instrumented to measure temperatures on external walls heat exchanger pipes, at pile-soil interface, in soil. The radial temperature gradients between pipes interface soil, were used evaluate soil resistances, respectively. same order magnitude with values 0.053 mK/W, 0.072 0.066 mK/W for pile, clay, due similarities their properties. analysis suggests that are influenced by dimensions, number concrete cover, type duration heating. Hence, meticulous interpretation considering these parameters should be conducted understand transfer processes accurately. Estimates resistance from equivalent diameter response test methods found inconsistent each other, highlighting significance steady state in-situ designing systems.