1:49AA125 of 317Tg-20°C12Suggested answer: (a) and (b) Height of neutral plane = 6.96 m from the floor5.4 An enclosure has a facade and openings according to the figure below and an ongoing,fully developed fire with a gas temperature of T, = 800°C. Set up the mass balanceequations and calculate(a) the position of the neutral plane(b) the pressure difference across the openings(c) the mass flow rates through the openingsThe openings can be considered to be narrow with respect to height.1m14m12mSuggested answer: (a) Neutral layer position is 1.51 m up from the center of the loweropening; (b) APwer = 12.9 Pa, APer = 107 Pa; (c) m, = 47 kg/s, m = 47 kg/s.5.5 An atrium in a hotel building is 20 m high and has a floor area of 600 m?. The atrium hasrelatively large openings at the floor level (10 m). An elevator door, which is 15 m abovethe floor, has a leakage area of 0.06 m², and smoke can spread from the atrium to the restof the building, mainly through this leak. If the gas temperature in the atrium is 250°C andthe ambient temperature is 20°C, calculate the mass flow rate through the elevator door.Suggested answer: Assuming the pressure difference across the lower opening to be =0,the pressure difference at 15 m height causes m, = 0.43 kg/s.5.6 An apartment building has 16 levels that are each 3 m high, connected by a stairwell. Theapartments have relatively large leakage areas to the outside and the temperature in theapartments is 20°C, as is the ambient outside temperature. The pressure in the apartmentsis therefore assumed to be equal to the pressure outside. A relatively weak fire in somerubbish fills the stairwell with smoke at a temperature of 60°C. The leakage area betweenthe apartments and the stairwell is =0.03 m per level. Assume C, = 0.7 and p, = 1.2 kg/m².Calculate the mass flow rate of smoke into the top most apartment if(a) the stairwell has no other openings(b) a door of 2 m? at the bottom level is openSuggested answer: Assuming the top opening to be situated 1.5 m from the top of thebuilding, we get (a) m, = 0.17 kg/s; (b) m = 0.26 kg/sO 2000 by CRC Press LIC

first we need to convert temperature to density dg= 353 /800+273 =0 328g ρ*a = 353/(20 + 273) =…

Answered: and (b) Height of neutral plane = 6.96…

and (b) Height of neutral plane = 6.96 m from the floor ade and openings according to the figure below and an ongoing. ith a gas temperature of T, = 800°C. Set up the mass balance

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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