Investigation on Thermal Environment in Underground Power Station

Ventilation is important for underground space to keep the space safely and to maintain machinery normally. We measured a thermal environment of an underground power station. Outdoor air is supplied to the main building of the underground power station through an air supply tunnel (equipments carrying tunnel), and exhausted outdoor through an exhaust air tunnel (electricity cable tunnel). The outdoor air is cooled and dehumidified by the air supply tunnel in summer. We made a simulation program for predicting thermal environment of the underground power station. We estimated the amount of cooling of indoor air by the supplied air, the surrounding walls, and the water pipe by the simulation. The thermal load in the main building is almost extracted by the supplied air. However, cooling by the surrounding walls and the water pipe is also effective to extract thermal load