Modeling of heat transfer in geothermal heat exchanger using GHZ zonal model method

Two types of Ground Heat Exchanger (GHX) zonal models are suggested for a new analysis method that can reduce analysis time and reflecting heat transfer mechanisms occurring on the GHX section; using a circular pattern (Circular) and replacing the circle with a square shape (Square). The GHX zonal model is suggested to analyze a 2-dimensional unsteady-state thermal performance involving heat interference between pipes in a borehole. Comparing results from the simulations and PHYSIBEL program (BISTRA), the temperature distribution of GHX zonal models is similar to that of BISTRA, therefore the analysis grid of the GHX zonal model is regarded as appropriate.