| Title | Feasibility of Using Groundwater Thermal Energy from a Limestone Aquifer for Medical Center Heating and Cooling |
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| Authors | Byoung Ohan Shim, Seong-Kyun Kim, Yonggil Shin, Ji Hoon Kang, Un Jik Bang |
| Year | 2026 |
| Conference | World Geothermal Congress |
| Keywords | |
| Abstract | This study investigates the use of groundwater-sourced thermal energy for a new hospital building, focusing on the feasibility of aquifer performance under specific hydrogeological conditions. The project site consists of limestone and alluvium, both exhibiting high hydraulic conductivity. To prevent contamination of the shallow aquifer, groundwater for heat exchange is extracted from a deeper aquifer. Results from pumping and injection tests indicate high hydraulic capacity and an initial groundwater temperature of 15°C. A conceptual hydraulic model is developed to simulate heat exchange processes and aquifer behavior. The performance of both cooling and heating operations is evaluated in relation to groundwater temperature variations and thermal diffusion resulting from pumping and reinjection. Thermal simulations are conducted using the building's projected heating and cooling loads and the planned locations of geothermal wells. Numerical results show minimal performance degradation due to long-term thermal diffusion within the target aquifer. Both cooling and heating operations remain within acceptable temperature variation limits, confirming the viability of groundwater-sourced thermal energy as a sustainable climate control solution for the hospital. These findings highlight the strong potential for broader application in large-scale facilities such as data centers, greenhouses, and public buildings, with further optimization possible based on local geological conditions. |