Nyman, H. & Dittmer, T. (2012). METRO – WP4: CFD-simulations of a single exit underground station. Forskningsrapport 2012:4 i serien Studies in Sustainable Technology vid Mälardalens högskola.
Abstract
This report summarises the work of WP4, a part of the METRO project. It investigates the performance of various smoke control systems for use in underground stations having only one exit to ground level. Two different smoke control systems with two different configurations were investigated: A pressurizing (positive pressure) supply air system; a pressurizing supply air system with platform screen doors; a mechanical exhaust air system with extraction fittings above the track area; and a mechanical exhaust air system with platform screen doors. Simulations were performed using Fire Dynamics Simulator, investigating two different heat release rates – 20 MW and 60 MW.
The results show that both the pressurizing supply air system and the mechanical exhaust air system provide effective smoke control. The advantages of a positive pressure supply air system are a relatively simple installation and a lower requisite flow capacity of the fans. The disadvantage is that the smoke is not dispelled, but can be spread to other platforms of the station and even to the next station. The advantages of a mechanical exhaust system are that the hot smoke is removed, and that the spread of smoke is restricted to the platform directly exposed to the fire. Disadvantages include the needfor a duct system, which requires space, and considerably higher fan capacities.
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