Numerical Analysis

In this paper, we propose a new calculation method for evaluating the inhomogeneous outdoor thermal environment by incorporating a multi-node human thermoregulation model into the simulation method based on CFD analysis of the outdoor thermal environment. We also investigated the effects of weather conditions on the inhomogeneity of the radiant environment and the thermal comfort for pedestrians using the proposed calculation method. Two different weather condition cases are investigated in this study: (1) a scorching hot day and (2) a cloudy day.

Velocity fields on the platform area and flow rate of the smoke extraction system were experimentally measured under the different fan-operation modes in an actual subway station in Beijing. The velocity at the four tunnels connected with the station and velocity at the stairs between platform and concourses were obtained. Through simulation based on the measured results, the smoke velocity, temperature and concentration in case of station fire under the different fan-operation modes were analysed, and the optimal smoke extraction mode was proposed.

The air quality in laboratories has a profound affect on occupant health and safety. Reducing the timeof exposure and the amount of contaminant can improve the occupant environment and have directimpact on health and safety. In this study, a novel ventilation system which introduces benchexhausts is proposed. The system offers the potential for application in new and existing researchlaboratories to effectively remove airborne contaminants at the bench using a technology that is costeffective and efficient.