Abstract:
Objective The loads of equipment rooms in urban rail transit stations are difficult to determine, resulting in generally overestimated equipment room air-conditioning load design. To reasonably calculate the equipment air-conditioning load, reduce construction costs and electricity energy consumption, it is necessary to conduct measured analysis of the cooling load of equipment rooms.
Method A method for calculating the heat generation of equipment rooms and analyzing the room load characteristics is proposed. The total heat load and the sensible heat load of equipment rooms are calculated separately. Using this method, field measurements are conducted at three metro stations in Ningbo, and comparative analyses are performed on the total heat load and the proportion of sensible heat load of each equipment room at the three stations respectively. Lastly, a simplified estimation method and recommended value range for the total heat load of equipment rooms are proposed based on the sensible heat load proportion.
Result & Conclusion The actual cooling loads of metro equipment rooms are all lower than the design loads. Except for the signal equipment room, where the proportion of sensible heat load reaches 94.0%, and the proportions of sensible heat load in other equipment rooms are below 90.0%. The proportions in public security communication equipment room, integrated monitoring equipment room, and civil communication equipment room are all below 50.0%. The cooling load of equipment rooms mainly originates from the heat generated by internal equipment, while the heat transfer characteristics of the building envelope and external climatic conditions have relatively minor effects on the cooling load.
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