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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?
The velocity of the center point of the wheel is constant at 20 ft/sec to the right. For the instant, determine the following: a) The velocity and acceleration of point B (which is attached to the wheel) measured with respect to ground.
The electric motor at A exerts a torque of 800N.m on the steel shaft from A to D. This has a torque of -300N.m at B and -500N.m at C. the dimensions are
A project consists of replacing the track on an existing railroad line, involving 3000 feet of track. The old track can be removed at a rate of 70 feet per hour. The old railroad ties can be removed at a rate of 200 feet (measured along the track) pe..
the inclined leg differential manometer as shown in figure 1 below shows a reading along the inclined leg mercury
The coefficient of kinetic friction between block A and the inclined plane is mu_k = 0.11 . The angle of the inclined plane is given by theta = 45. Neglect the weight of the rope and pulley. Part A - Normal Force Acting on Block A Determine the ma..
ABC is a triangular tract of land. The 1.5 tract DEFG is to be subdivided. AE is 480ft and DC is 350 ft. Determine the lengths of DG and CB. (Note 1 acre= 43,560 f^2)
A steel plate which is 1.5 m by 1.5 m and 30 mm thick is lifted by four cables attached to its corners that meet at a point that is 2 m above the plate. Determine the required cross sectional area of the cables
A trapezoid has a bottom width of b, and top width of T, a heightof h, and side slopes of z(horizontal to vertical). By integration, determine the location of the centroid of thetrapezoid Define your coordinate system.
A 20 mgd wastewater treatment plants primary clarifier influent has 800 mg/l solids. the clarifier removes 18 percent of the solids. the sludge flow rate is 0.070 MGD.
A U manometer reads 20 cm air as operating fluid and a given manometric fluid. A single branch closed tube reads 35 cm connected to point 1. If P2 = 1.2 ATM calculate the pressure in point 1 and the density of the manometric fluid.
Determine whether the block shown is in equilibrium and find the magnitude and direction of the friction force when theta=30 and P=150N
A reservoir discharge into a 60-inch concrete pipe (rough surface) that discharges freely. what is the pressure in the pipe at point A consider friction, but neglect minor losses.
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