Air velocities in tunnels-a combination of simple hand calculations
Publication details: Borås : RISE Research Institutes of Sweden, 2020Description: s. 667-668Subject(s): Online resources: In: Proceedings from the Ninth International Symposium on Tunnel Safety and Security, Munich, Germany, March 11-13, 2020Abstract: The poster describes a proposal for a method to calculate the resulting air velocity in tunnels in case of a fire. The method is based on a composition of simple hand calculation methods for wind influence based on weather statistics, tunnel geometry, season-based temperatures in the tunnel and heat release rate (HRR). The calculations include effects of air movement just before the fire develops and adds the influence of the fire. The purpose of the simplified calculations can, for example, be used to determine input data for CFD models and evacuation calculations.The poster describes a proposal for a method to calculate the resulting air velocity in tunnels in case of a fire. The method is based on a composition of simple hand calculation methods for wind influence based on weather statistics, tunnel geometry, season-based temperatures in the tunnel and heat release rate (HRR). The calculations include effects of air movement just before the fire develops and adds the influence of the fire. The purpose of the simplified calculations can, for example, be used to determine input data for CFD models and evacuation calculations.