A classroom has the dimensions of

10m

long,

8m

wide and

6m

high and an open window of

1.5m

long and

2m

high. A methanol bottle breaks to form a

2-m

diameter pool fire. The initial room temperature is

20\\\\deg C

, and the heat of combustion of methanol or wood is

22M(J)/(k)g

,\ (a) What is the heat release rate of the pool fire?\ (5 marks)\ (b) Can this pool fire always trigger the heat detector (RTI

=120m^((1)/(2))s^((1)/(2))

) with a threshold temperature of

65\\\\deg C

?\ (6 marks)\ (c) If this fire is

1m

away from the detector, how long it triggers the heat detector? (7 marks)\ (d) If there are twenty

25-kg

sofas in the room, and flashover occurs in

5min

, what is the total burning duration?\ (7 marks)

A classroom has the dimensions of 10m long, 8m wide and 6m high and an open window of 1.5m long and 2m high. A methanol bottle breaks to form a 2m diameter pool fire. The initial room temperature is 20C, and the heat of combustion of methanol or wood is 22MJ/kg, (a) What is the heat release rate of the pool fire? (5 marks) (b) Can this pool fire always trigger the heat detector (RTI =120m1/2s1/2 ) with a threshold temperature of 65C ? (6 marks) (c) If this fire is 1m away from the detector, how long it triggers the heat detector? (7 marks) (d) If there are twenty 25kg sofas in the room, and flashover occurs in 5min, what is the total burning duration? (7 marks)