Sub-system energy model based on actual operation data for subway stations

Abstract

With the continuous expansion of the subway scale, the amount of energy consumed by subway stations has become a great concern for both governments and researchers. Despite of enormous energy use, there is a lack of energy model to evaluate the actual energy performance and energy conservation potential of subway stations. This paper concentrates on the establishment of a sub-system energy model based on theoretical analysis and actual operation data, with the aim to evaluate the operational energy conservation potential of the subway stations. This sub-system model is composed of models for ventilation and air-conditioning (VAC) system, lighting system, vertical transport system and station devices. With the help of this model, the energy consumption of the station can be calculated by inputting several parameters which are easy to obtain in actual projects, such as train departure density, temperature and humidity of the indoor and outdoor air, passenger flow of the subway station, etc. The model is validated via the field test and ventilation simulation in a station located in Zhejiang Province, China. And then, the model is applied to evaluate the current operation condition and several energy-saving measurements of 6 subway stations. The most notable significance of this model is that it can calculate the energy consumption of each system using actual operation data. Therefore, it serves as an effective model to analyze the energy conservation potential of changing operation pattern or adopting energy-saving technologies, which gives guidance to the energy-saving retrofit in actual projects.