Theoretical models and simplification of sub-system energy use systems in underground railway stations

With the continuous growth of electricity consumption in underground railway stations, it is necessary to establish energy consumption indicators for major energy use systems to evaluate the energy consumption level and energy saving potentials. Based on the operating characteristics of the major energy use systems of underground railway stations, develops the sub-system energy models, including ventilation and air conditioning (VAC) model, lighting (LIGHT) model and vertical transport (TRANS) model. With the help of these models, the reasonable energy consumption of each sub-system can be simulated by inputting construction and operation status of the underground railway station. Furthermore, taking into account the large workload of data collection in practical engineering applications, extracts the important input parameters of the sub-system energy models using sensitivity analysis, and studies the simplification of the models. The results show that the CV-RMSE of the simplified VAC and TRANS models are 7.6% and 7.4%, respectively, which are acceptable for engineering application. The proposed simplified model greatly reduces the difficulty of data collection in actual projects. Therefore, it is easy to be used in the large-scale application in more underground railway stations across the country to quickly evaluate the operating conditions and assess energy saving potential of underground railway stations.