ABSTRACT
This study investigates a number of micropile solutions available in Europe to convert them into geothermal micropile by installing heat exchangers inside conventional micropiles. Two distinct types of micropiles are available in the market based on their material composition: steel and concrete. These micropiles were examined alongside two different heat exchanger configurations—specifically, a single U-tube and separatus loop. A thermal performance test was performed using finite element analysis for two types of operational mode: heat extraction and heat rejection. The analysis revealed conventional U-loop exhibited slightly higher thermal performance compared to separatus loop, due to the higher shank space, which allows for more efficient heat transfer. Despite being marginally less efficient in thermal operation, separatus loop offers distinct practical advantages. Its design makes it well-suited for installation in energy micropiles with smaller diameters, where conventional U-loops may not be viable due to space limitations or construction challenges.
