[A-HW25] Near Surface Investigation and Modeling for Groundwater Resources Assessment and Conservation

[AHW25-P01] A New Heat Transport Model for Ground Source Heat Pump Systems with Considering Advection in Aquifers

*Chia-Hao Chang¹, Bo-Tsen Wang¹, Jui-Pin Tsai¹ (1.National Taiwan University)

Keywords:Ground source heat pumps, Heat transport models, Groundwater flow, Subsurface temperature

A ground source heat pump (GSHP) system is an energy-saving technology widely used in buildings. The system transports heat from/to the subsurface for heating/cooling the buildings. The subsurface temperature is so constant (relative to climate change with seasons) that minimizes the temperature difference of heat transport during heating or cooling and reduces the energy consumption from the electricity. In the past, some geothermal models for the GSHP system were developed by assuming that only heat conduction mechanism exists in the subsurface. However, the assumption may inapplicable to an aquifer with a high groundwater flow velocity. This study hence develops a new heat transport model for describing the subsurface temperature induced by the advection from the groundwater flow in the GSHP system. The model consists of a heat conduction-advection equation. The ground heat exchanger is considered as a cylinder heat source of the GSHP system. Important parameters including groundwater velocity, aquifer thermal properties, and borehole thermal properties are also considered in the developed model. The study results show how the important parameters affect the temperature.