Effect of layered geological structures on borehole heat transfer

Borehole heat exchangers, especially deep ones, are usually drilled through different geological layers having varying properties. Homogeneous and layered models can be used for borehole performance predictions. The homogeneous model considers all as a single layer effective properties while the separately gives better accuracy, although it is more complicated time consuming to calculate. In this study, by considering real structures, thermal predictions of made using both results compared examine how differ from each other depending on statistical characteristics structures. An analytical expression derived relation between deviations model. magnitudes very small essentially depend variance difference decaying function. help understand horizontally structures influence when we need