ABSTRACT
Utility tunnels are constructed to safely and efficiently house various urban infrastructure facilities (such as electricity, communication, gas, water, and heating) underground. Sensor management in utility tunnels is important for enhancing safety and efficiency, as well as for cost reduction, environmental protection, and disaster preparedness. When systematic and continuous sensor management is implemented, utility tunnels can function reliably and safely. The most common issue in utility tunnels is condensation, which negatively influences the performance and lifespan of sensors. Therefore, preventing and managing condensation is crucial for ensuring the stable operation of sensors. The problems caused by condensation can be minimized by systematic and continuous management and preventive measures. This study addresses the issues caused by condensation and the process of condensation formation. Furthermore, a computational fluid dynamics (CFD) analysis is conducted to calculate the optimal response time for condensation. The CFD analysis simulated condensation formation using conditions specific to South Korea (external peak temperature, humidity, and tunnel conditions). The formula derived from this analysis can be applied to actual utility tunnels to calculate the “golden time” for addressing condensation based on the location of control devices, such as sensors and ventilation fans, installed in each tunnel.
