Numerical Study of a Buried Hemispherical Double-Tube Soil Heat Exchanger Utilizing Geothermal Energy

Abstract

This paper presents a numerical study of a buried hemispherical double-tube soil heat exchanger utilizing geothermal energy. Since the local air wall exchange coefficient throughout the heat exchanger is unknown, a mathematical study based on the unsteady Green's function theory was developed. The complexity of the geometry prompted us to conduct a numerical study that allowed us to obtain results reflecting the importance of heat exchange. There are many applications, especially storing energy underground to optimize greenhouses according to seasonal cycles. Numerical calculations were performed using CFD code to determine the temperature distribution and verify the reliability, accuracy and physical authenticity of this work.