Question: thanks PROBLEM # 5[ 20pts] A concrete wall 35cm thick encloses a room. The wall is initially at 21C when a fire erupts inside the

$thanks PROBLEM \# 5[ 20pts] A concrete wall 35cm thick encloses$

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PROBLEM \# 5[ 20pts] A concrete wall 35cm thick encloses a room. The wall is initially at 21C when a fire erupts inside the room, which exposes the inside of the wall to combustion gases at 800C. The outside wall of the room is covered with insulation (assume perfect insulation) which has an ignition temperature of 200C. The effective heat transfer coefficient between the hot gas and the wall is 10W/(m2K). Find the time at which the insulation starts burning. The properties of concrete are given below. =2300kg/m3k=1.4W/(mK)CP=880J/(kgK)=6.917107m2/s

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