Abstract
With the continuous expansion of the subway scale, the amount of energy consumed by subway stations has become a concern, among which the energy consumption of ventilation and air-conditioning (VAC) system takes a large proportion. There are many former studies concentrated on this topic. However, the problems of previous studies are obvious, such as time-consuming and unclear practical meaning of the energy model. This study has proposed a model based on theoretical analysis and focused on the energy model of the VAC system for underground subway stations. The energy model consists of the model for the cooling load and the energy efficient ratio. In this model, basic station information and environmental parameters should be tested and inputted. Then with the help of simple simulation tools, Subway Thermal Environment Simulation Software (STESS), the energy consumption of the station can be fast estimated by the model proposed in this paper. This model can be applied to determine the energy-saving potential of changing operation pattern and adopting energy-saving technologies, which gives guidance to the energy-saving retrofit of the station.
Highlights
1.1 BackgroundNowadays, with the rapid economic development, more and more cities are equipped with the subway system to improve urban infrastructure
Annual electricity consumption ranges from 131 to 144 kWh/m2 in underground non-transfer stations in China [2], among which the energy consumption of the station accounts for about 42% of the total energy consumption of the urban rail transit system in Beijing [3]
The ventilation and air-conditioning (VAC) system accounts for 54-71% of the total energy consumption, followed by the lighting system (21-27%)
Summary
With the rapid economic development, more and more cities are equipped with the subway system to improve urban infrastructure. According to Annual Report of Urban Rail Transit (2014), the energy consumption composition of the underground subway station is shown in Fig. 1[1]. 1.2 Literature review In order to calculate the energy consumption, many researchers have established the energy models for subway stations. Former researchers have put forward the framework of energy use model for underground subway stations, considering building construction, ventilation, occupant behaviour, and environmental conditions [5]. In this study, theoretical energy consumption model for the VAC system of the subway station is proposed. The model proposed in this paper serves as an effective tool to guide the overall energy-saving projects of subway stations in that it reveals the operation principle of each part and the results can be fast obtained
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