Answer Happy

Question 3. (25 points) The regulatory authority and designers of the newest building in St. Lucia campus (see Figure 2) decide that a smoke extraction system needs to be utilized in order assure that smoke is maintained away from occupants evacuating using the highest bridge inside the open atrium. The atrium has ground-to-ceiling height of 15 m (see Figure 2). The regulatory authority finally decides that no smoke can be accumulated, and that the smoke system needs to cope with a 1.5 MW design fire (i.e. Q = 1.5 MW). Calculate the extraction rate necessary to completely prevent the smoke accumulating. Entrainment equation is shown below: 1/3 9PÅ m₂ = E Q1/3 H5/3 C₂TA where: PA = 1.2 kg/m³ Cp = 1000 J/kgK TA = 20°C 15 m Figure 2. Atrium of the newest building in St. Lucia campus E = 0.2 • g = 9.81 m/s² ●