Understanding performance based design for smoke extraction system with modelling and simulation Gupta Alok B.E. (Mech), PGDBM, PGDFLA, Industry Expert in Ventilation, Fire Simulation CFD/FEA Simulation, Email id: gupta.aalok@gmail.com Online Published on 20 May, 2022. Abstract As per NBC Part 4 HVAC (Heating Ventilation and Air conditioning) and mechanical ventilation requirements of different areas in any occupancy/Type of building is elaborated in Part 8 (Building Services, Section 1 - Lighting and Natural Ventilation & Section 3 - Air conditioning, Heating and Mechanical Ventilation) of NBC. Smoke leads to Fire and smoke. Smoke lead to drop in visibility and create dark dense black smoke cloud. Situation get further critical when people need assisted evacuation (Patient/Child or Critical care Centre) and area of high people density (Malls/Theatre/ITES and similar Areas). As per NFPA 92–2012 standard, for tenability criteria it refers to the SFPE Handbook of Fire Protection Engineering, based on SFPE Handbook the visibility levels shall be more than 5 to 10meters and the temperature levels shall be below 60°C at the height of 1.8m (human height) is considered to safe criteria to provide the safe escape in case of fire emergency. Many high-rise buildings integrate smoke management systems into their conventional HVAC systems. In such installation, it requires special design considerations, including safe and adequate controls, acceptable and documented testing and regular maintenance systems. In General NBC 2016 recommends Fire Compartment the same shall be protracted by 120 min fire rating and more based on HAZZRAD. As we know time is a very critical criteria for life safety and it is very important to know time for safe evacuation technique. With the use of HPC (High Performance Computer/Cloud Computing) Computational Fluid Dynamics (CFD) modelling technique is becoming popular. IN CFD we solve governing equation in conservation of mass, momentum, energy and gas species at, typically, several thousand nodes within the building premise and solve high order equations with HPC. Popular CFD tools models temperature, velocity, smoke concentration, etc, can be made as a function of time. These approach offers the prospect of a more general predictive tool for the calculation of conditions prevailing during a fire and for the optimization of smoke control and fire protection measures for the optimization of smoke control and fire protection measures. This approach is said A performance-based design method (analytical or qualitative) design. Modelling- can be used for verifying fire safety (fire management and emergency evacuation) solutions instead of code prescriptive design for a couple of reasons. Top Keywords Performance Based Design, CFD, Tenability, Modelling and Simulation, NBC Part 4, NFPA 92. Top |