b) A cylinder wall with a size of 3 0 ft thick is used as the primary lining inside the industrial furnace The rear side of the wall is well insulated Before the heating process starts, the wall is maintained at uniform temperature of 70 F and then it is exposed to a gas at 2800 F during heating If the wall temperature reached 2000 F at the rear side of the furnace, the process will automatically by passed and the safety alarm will be triggered Use convection coefficient 3 42 btu hr ft F, thermal conductivity 4 26 btu hr ft F and thermal diffusivity 0 86 ft hr i) Calculate the time required to attain 1450F at a point of 1 5 ft depth from the surface furnace wall 10 Marks C01, POI, C3 ii) For safety operation, justify the maximum time of the furnace can be operated continuously 19 Marks C01, PO1, C3 SDL IN b) A cylinder wall with a size of 3 0 ft thick is used as the primary lining inside the industrial furnace The rear side of the wall is well insulated Before the heating process starts, the wall is maintained at uniform temperature of 70 F and then it is exposed to a gas at 2800 F during heating If the wall temperature reached 2000 F at the rear side of the furnace, the process will automatically by passed and the safety alarm will be triggered Use convection coefficient 3 42 btu hr ft F, thermal conductivity 4 26 btu hr ft F and thermal diffusivity 0 86 ft hr i) Calculate the time required to attain 1450F at a point of 1 5 ft depth from the surface furnace wall 10 Marks C01, POI, C3 ii) For safety operation, justify the maximum time of the furnace can be operated continuously 19 Marks C01, PO1, C3 SDL IN

Question

b) A cylinder wall with a size of 3 0 ft thick is used as the primary lining inside the industrial furnace  The rear side of the wall is well insulated  Before the heating process starts, the wall is maintained at uniform temperature of 70 F and then it is exposed to a gas at 2800 F during heating  If the wall temperature reached 2000 F at the rear side of the furnace, the process will automatically by passed and the safety alarm will be triggered  Use convection coefficient 3 42 btu hr ft  F, thermal conductivity 4 26 btu hr ft F and thermal diffusivity 0 86 ft  hr  i) Calculate the time required to attain 1450F at a point of 1 5 ft depth from the surface furnace wall   10 Marks   C01, POI, C3  ii) For safety operation, justify the maximum time of the furnace can be operated continuously  19 Marks   C01, PO1, C3  SDL IN b) A cylinder wall with a size of 3 0 ft thick is used as the primary lining inside the industrial furnace  The rear side of the wall is well insulated  Before the heating process starts, the wall is maintained at uniform temperature of 70 F and then it is exposed to a gas at 2800 F during heating  If the wall temperature reached 2000 F at the rear side of the furnace, the process will automatically by passed and the safety alarm will be triggered  Use convection coefficient 3 42 btu hr ft  F, thermal conductivity 4 26 btu hr ft F and thermal diffusivity 0 86 ft  hr  i) Calculate the time required to attain 1450F at a point of 1 5 ft depth from the surface furnace wall   10 Marks   C01, POI, C3  ii) For safety operation, justify the maximum time of the furnace can be operated continuously  19 Marks   C01, PO1, C3  SDL IN

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b) A cylinder wall with a size of 3.0 ft thick is used as the primary lining inside the industrial furnace. The rear side of

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