NUMERICAL SIMULATION OF SMOKE VENTILATION IN RESCUE STATION AND ESCAPE ROUTE OF RAILROAD TUNNEL IN FIRE INCIDENT

Transient 3-D numerical simulations were performed to analyze the fire safety in a long railroad tunnel equipped with the mechanical ventilation system using dampers and jet fans. The flow behaviors of heat and pollutants were investigated for various emergency operation modes of the ventilation system in a rescue station and escape route in the long railroad tunnel in case of fire. The results showed that the ventilation mode, which extracts heat and pollutants from the tunnel on fire and pressurizes the opposite tunnel, was very effective for the fire safety of the rescue station. To evaluate the ventilation efficiency of the escape route, various geometries such as connection and slope angles of the escape route were considered. The importance of the jet fan operation in the escape tunnel on the ventilation performance was also discussed in detail.

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RADIATIVE HEAT TRANSFER IN FIRE SAFETY SCIENCE

Proceeding of the 4th International Symposium on Radiative Transfer ◽

10.1615/ichmt.2004.rad-4.10 ◽

2004 ◽

Author(s):

Jean-Francois Sacadura

Keyword(s):

Heat Transfer ◽

Fire Safety ◽

Radiative Heat Transfer ◽

Radiative Heat ◽

Safety Science ◽

In Fire

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Numerical and Experimental Modeling of Indoor Air Quality Inside a Conditioned Space with Mechanical Ventilation and DX-Air Conditioner

Engineering and Technology Journal ◽

10.30684/etj.v38i9a.875 ◽

2020 ◽

Vol 38 (9A) ◽

pp. 1257-1275

Author(s):

Wisam M. Mareed ◽

Hasanen M. Hussen

Keyword(s):

Air Quality ◽

Indoor Air Quality ◽

Indoor Air ◽

Ventilation System ◽

Thermal Conditions ◽

Airflow Rate ◽

Air Conditioner ◽

Breathing Zone ◽

Lecture Room ◽

Ventilation Performance

Elevated CO2 rates in a building affect the health of the occupant. This paper deals with an experimental and numerical analysis conducted in a full-scale test room located in the Department of Mechanical Engineering at the University of Technology. The experiments and CFD were conducted for analyzing ventilation performance. It is a study on the effect of the discharge airflow rate of the ceiling type air-conditioner on ventilation performance in the lecture room with the mixing ventilation. Most obtained findings show that database and questionnaires analyzed prefer heights between 0.2 m to 1.2 m in the middle of an occupied zone and breathing zone height of between 0.75 m to 1.8 given in the literature surveyed. It is noticed the mismatch of internal conditions with thermal comfort, and indoor air quality recommended by [ASHRAE Standard 62, ANSI / ASHRAE Standard 55-2010]. CFD simulations have been carried to provide insights on the indoor air quality and comfort conditions throughout the classroom. Particle concentrations, thermal conditions, and modified ventilation system solutions are reported.

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