| Abstract |
The distribution law and thermal response characteristics of shallow geothermal energy are one of the key geological issues affecting its efficiency in the process of shallow geothermal energy development. When the scale of a single ground source heat pump system is large, the supply capacity of shallow geothermal resources will directly restrict the overall energy efficiency ratio of the system. Therefore, it is necessary to carry out research on the heat exchange mechanism of shallow geothermal energy to determine the magnitude and evolution trend of the heat exchange of individual systems. This paper selects typical ground source heat pump projects with buried pipes in Beijing. By studying the dynamic response mechanism of the temperature field of the rock and soil mass under the influencing factors such as groundwater flow rate, stratification of rock and soil mass, and seasonal changes in cold and heat, the spatio-temporal distribution law of heat exchange in shallow geothermal energy is analyzed. The results show that during the exploitation of shallow geothermal energy, the heat exchange capabilities of different holes and different layers present significant differences. Laying underground pipes at a certain mesh size, equal spacing and equal depth is unscientific. It is recommended to carry out refined exploration and evaluation of shallow geothermal energy mainly based on the evaluation of heat exchange capabilities to find target areas with good heat exchange effects of underground pipes. The laying of underground pipes should be determined differently based on the size of the heat exchange contribution capacity. |