Study on load characteristics of different air conditioning systems in large space railway station

Abstract

The railway station is a representative kind of large space building, whose air-conditioning system design has always been paid a lot of attentions. At present, the air-conditioning system at a train station is mainly a stratified air conditioning mode with spout air supply outlets, which has a significant thermal stratification and energy waste in winter. In this paper, a large space waiting room of one railway station in Wuhan is taken as the analysis example, and the CFD method is used to simulate the airflow and temperature distribution under different air-conditioning terminal devices in winter and summer. The airflow organization models of the waiting hall under three typical air-conditioning systems have been established including stratified air conditioning system, air handling unit special for large space system and floor radiation system. The temperature and velocity distributions of the large space in the waiting hall are comparatively simulated under each system. The temperature stratification, the amount of cooling and heating requirements are obtained for three types of air conditioning systems. According to minimum amount of the annual cooling and heating loads, a terminal device form of air-conditioning system which is suitable for large space is provided. The results can provide a reference for the design of air-conditioning systems for similar large space buildings.