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Fire Dynamics: Energy Release and Ceiling VentilationAn atrium has a floor area of 30 m by 20 m and is 20 m high. The ceiling ventilation is designed for a fuel area of 30 m2 with an energy release rate of 0.5 MW/m2. The inlet openings are very large. An effective heat conduction coefficient can be assumed to be 20 W/m2°C.
(a) Calculate the area of ceiling vents required for ensuring a maximum thickness of the smoke layer of 5 m.
(b) A weak fire occurs in the atrium; a sofa burns for 3 minutes and releases energy at the constant rate of 500 kW. The ceiling vents are opened through signals from smoke detectors at the ceiling level, which activate at a temperature rise of 10°C. What will happen? Will the atrium be filled with smoke? How fast will this happen?
Modify function random0 so that it can accept 0, 1, or 2 calling arguments. If it has no calling arguments, it should return a single random value. If it has 1 or 2 calling arguments, it should behave as it currently does.
on a specific westbound section of highway studies show that the speed-density relationship is u= uf [1-(k/kf)^3.5] It is known that the capacity is 4200 veh/h and the jam density is 210 veh/mi.
calculate the total metabolic heat generated by a singing canary taking into account heat transfer by radiation, convection and exhaling air. The air temperature is 20`C, canary's body internal and surface temperature is 33`C
A Newtonian fluid is in the clearance between a shaft and a concentric sleeve. When a force of 600 N is applied to the sleeve parallel to the shaft, the sleeve attains a speed of 1 m/s. If a 1500 N force is applied
An oil storage area abandoned 19 yrs ago had oil spilled on the ground and saturated the soil at a concentration of 400mg/kg of soil. A recent soil sample shows a concentration of 20mg/kg.
A montmorillonite clay has a liquid limit of 160, a plastic limit of 75 and a shrinkage limit of 10. Calculate the percentage of change in total volume with respect to its initial volume when a specimen of this clay is completely dried from a water c..
Material for an earth filll was available from borrow sites at $6.4 per cubic meter and a void ratio of 0.8. In the compacted state the fill measured 100,000m3 at void ratio of 0.7. what will be the total cost of the material in compacted state?
velocity of water in the nozzle is given by V=2t/(1-.5x/L)^2. L = 4ft. When x=.5L and t=3s what is the local acceleration along the centerline. What is the convective acceleration.
A horizontal curve on a single-lane highway has its PC at station 124 + 10 and its PI at station 131 + 40. The curve has a superelvation of 0.06 ft/ft and is designed for 70 mi/h. What is the station of the PT?
Beam Deflection Solution, Derive an expression for the deflection due to shear for a cantilever beam of constant rectangular cross section, under action of a point load, P at free end.
Determine the acceleration of the initially stationary 20-kg body when the 50-N force P is applied. The small wheels at B are ideal, and the feet at A are small.
Design a one way slab to support a uniform live load of 300 psf. The beam is simply supported with a span of 20 ft. Use a reinforcement ration ( Ps) of 0.008 Use f'c=3000 psi and fy=60000 psi.
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