Analysis of energy-saving for ventilation and air-conditioning system of subway stations with platform screen doors

Abstract

Under the background of rapid urbanization and carbon neutralization, energy-saving operation of subway stations has become a widespread concern in China. This study focused on energy-saving measures and potentials for Platform Screen Door (PSD) subway stations in various climates. To this end, theoretical-based white-box model was innovatively established and validated. Then Ventilation and Air-Conditioning (VAC) energy was extensively simulated to systematically analyze energy-saving potentials of five common measures, including mechanical fresh air supply, PSD airtightness, station temperature, Coefficient of Performance (COP) of chiller, Energy Efficiency Ratio (EER) of terminal equipment. Results show that operation measure with the greatest energy-saving potential is increasing air-conditioning temperature, with 16.9–21.0% of energy-saving potential. Besides, cancelling mechanical fresh air supply, improving COP of chiller, and improving EER of terminal equipment can bring about 11.6–20.3% of energy-savings for stations in different climate regions, whereas enhancing airtightness of PSD exerts the slightest impact on the VAC energy use, with merely 5% of energy-saving potential. Suggestions were proposed quantitatively according to effectiveness and priority of the measures, and economic benefits were discussed preliminarily. The outcomes of this study not only provide information support for governors to formulate specifications, but also provide reference for operators to take effective measures.