Temperature and smoke profile of fire in the parking of a commercial building with Pyrosim software

Subject Areas : Journal of New Applied and Computational Findings in Mechanical Systems

Fatemeh  Behbahani ¹ (Mechanic, ahvaz, Iran)
mahdi  hamzei ² (Department of Mechanical Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran)
zahra  mehrdoost ³ (Department of Mechanical Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran)
mohammad  moghiman ⁴ (Department of Mechanical Engineering, Ferdowsi University, Mashhad, Iran)

Received: 2022-01-02 Accepted : 2022-03-14 Published : 2022-02-20

Keywords: smoke concentration, smoke control, Fire, temperature profile, pyrosim software,

Abstract :

In recent years, the use of parking space in large buildings has become popular. One of the dangers that always threatens buildings is the risk of fire. Smoke is generated after a fire. Smoke from fire poses a greater risk to life than fire. By controlling the smoke, the building and its occupants can be protected and the damage caused by the fire can be reduced. In this study, smoke distribution and temperature profiles in the parking lot of a commercial complex were investigated using Pyrosim software. Navier-Stokes equations for energy, Conservation of mass were used to solve, and Large Eddy Simulation model was used for turbulence. Two scenarios were considered to investigate the fire. In the first scenario, parking without a ventilation system was studied and in the second scenario, it was studied with the ventilation system. Exhaust fan was used to evacuate the smoke and a supply fan was used to supply fresh air. The results of these two simulations were compared with each other. The fire power was 4 MW. The results showed that in the first scenario, the smoke concentration is 0.003 mol / mol and the temperature is 80 ° C. In the second scenario, the smoke concentration is 0.0002 mol / mol, which is 93% better than the first scenario. The temperature also dropped to 28 ° C by evaporating the smoke in 1200 seconds. In fact, the temperature improved by 65% compared to the first scenario. Reducing the concentration of smoke and lowering the temperature make it easier for people to evacuate during a fire.

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