Simulation analysis of heat influence of ground-source heat pump system on geological environment in Shanghai

Based on the test data of a project in Shanghai, sets up a physical model with the soil stratum being generalized for seven slices. Simulates and analyses the soil temperature field characteristics in heat transfer region after ten years’ operation under unbalance conditions between cooling load and heating load. The results show that the average soil temperature in heat transfer region will raise 2.44 ℃ after ten years, the amplitude decreases with the soil depth, the heat-affected radius linearly increases with time. The mean heat-affected radius is about 20 m after ten years. The heat-affected radius of shallow soil stratum is greater.