GENERATION AND MAINTENANCE OF THE REQUIRED AIR PARAMETERS IN SUBWAY TUNNELS DURING WARM SEASONS

Heat buildup in subway tunnels in warm seasons is a major hazard which can be removed using fan units. At the present time, the problem of heat processes and microclimate maintenance in subways with double-track tunnels is studied insufficiently. This article discusses ventilation performance in subway with double-track tunnels using data on the busiest line of the Moscow Metro (Taganka–Krasnaya Presnya). Heat buildup from trains and passengers is estimated, and temperature balances are determined for tunnels at different depths of occurrence: 5, 10 and 20 m. The required and daily air flows are calculated for the hottest month of the year (July) using established standards and statistical data. The article shows that the estimated daily air flow fails to meet regulatory requirements, and the outlet air temperature greatly exceeds the standard of +33 °С. The required air flow rate in case of adjustable ventilation is determined. However, the resultant demands imposed on fan capacity considerably exceed capabilities of the available ventilation equipment: for the time span between 6 and 5 p.m. on the hottest day of the warmest month, the required capacity of a fan in the concurrent operation of two fans makes 273 m3/s. It is suggested to cool air by adiabatic humidification in air washer. Under adiabatic humidification, the outlet air temperature can be reduced on average no less than by 2 °С in warm seasons and by 5–6 °С on the hottest day of the warmest month.

Keywords

Subway, ventilation, temperature balance, occurrence depth, climatic parameters, air cooling, air humidification, warm season.

Issue number: 11
Year: 2018
ISBN:
UDK: 622.4:625.42
DOI: 10.25018/0236-1493-2018-11-0-63-69
Authors: Alferova E. L., Lugin I. V.

About authors: Alferova E.L., Junior Researcher, e-mail: alferova@mosk.ru, Lugin I.V., Candidate of Technical Sciences, Assistant Professor, Senior Researcher, Chinakal Institute of Mining of Siberian Branch of Russian Academy of Sciences, 630091, Novosibirsk, Russia.

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