Investigation on energy consumption characteristics in different time scales of a metro station

As a big energy consumer in metro station, the air-conditioning system is responsible for air-cooling and ventilation in cooling season while only for ventilation in other seasons. Understanding the hourly energy consumption characteristics of the system contributes to renewable energy integration and achieving carbon emission reduction in metro stations. Thus, energy consumption characteristics in different time scales of a Beijing metro station is investigated in this study. The results reveal that the air-conditioning system accounts for 61.7% of the total electricity consumption for the entire year, while the proportion rises to 73.7% for the cooling season. In the daily scale, the electricity consumption for air-conditioning increases with the outdoor air temperature rising, while it is nearly free from the effect of the passenger flow rate changing. In the hourly scale, the electricity consumption for air-conditioning shows a weather-condition-related characteristic, the electricity consumption for lighting shows a time-related characteristic, while the electricity consumption for others is nearly constant during the operation period. It is anticipated that the study helps to understand the hourly energy consumption characteristics and provides reference for energy-saving strategy selection in metro stations