Theoretical and numerical studies of heat and humidity transfer in underground ventilation corridor

Abstract

Corridor ventilation is a crucial measure to provide good air quality for underground buildings, it is necessary to predict and study the variation law of the environment in the corridor. Theoretical analysis and numerical simulation of heat and humidity transfer were carried out and the equations to predict air temperature and moisture content are proposed for the underground corridor. Corridor structure (e.g. cross-section diameter, length) and environmental parameters (e.g. wall temperature, air velocity, inlet air temperature, and relative humidity) are discussed in detail. The corridor structure parameters have been found to have little impact on the cooling and dehumidification effect when the corridor length x/L > 0.1. The inlet air temperature and velocity are the most crucial parameters for the cooling and dehumidification efficiency. The inlet air relative humidity and wall temperature are the main factors of fog formation in the corridor. Therefore, reasonable design and matching of corridor parameters is very important for the environmental control in underground corridors.