Abstract
In the last decades, the construction of subway systems has been in rapid progress in metropolis. Former studies have pointed out that substantial amount of energy is consumed by subway stations. Thus, the adjustable platform screen door (APSD) system is widely adopted, which is characterized by the energy-saving in both the cooling season and the transitional season. However, the installation of APSD system might result in thermal discomfort for passengers, which lacks investigation. This study aims to study the performance on the thermal comfort of subway station with APSD system. In this process, Computational Fluid Dynamics (CFD) Simulation was conducted using PHOENICS to obtain the velocity and temperature distribution under 3 kinds of train arrival patterns. Furthermore, Relative Warmth Index (RWI) was used to assess thermal comfort. The results show that the velocities of the platform and station hall are below 2.5m/s and 3.7m/s respectively, which is closely related to the train arrival pattern. With regard to the platform occupied zone, the RWI is between 0.04 to 0.19, which is almost within the thermal comfort zone according to the ASHRAE comfort classification. Nevertheless, for the occupied zone of the hall, the RWI is between 0.15 to 0.52, indicating relatively warm.
Highlights
Nowadays, with the rapid economic development, more and more cities are equipped with the subway system to improve urban infrastructure
This paper aims to study the thermal comfort for subway stations with the commonly-applied adjustable platform screen door (APSD) system under the ventilation mode
It can be concluded from the Relative Warmth Index (RWI) that the thermal comfort in the platform is better than the hall under the studied typical condition
Summary
With the rapid economic development, more and more cities are equipped with the subway system to improve urban infrastructure. The energy consumption of subway station is much higher than that of other types of public buildings due to the long operation time, intensive train timetable and high passenger density. It is widely acknowledged that platform screen door system is energy-saving in the cooling season, whereas the security door system is energy-saving in the ventilation conditions [2,3]. The adjustable platform screen door (APSD) system is widely applied in actual projects due to its energy-saving characteristics in consideration of the whole year [4,5,6], the operation mode of which can be switched between the ventilation and closed mode.
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