A cylindrical shell with flat ends contains a fluid at 100°C and is lagged with 10 cm thick layer of insulating material of thermal conductivity 0.05 W/m°C. the shell is placed in a room where the air is at 20°C and the convective coefficient at the outer surfaceof the laggig is 10Wm2°C if the volume enclosed is 10 m3 and the ratio is of cylinder length radius is 8 , workout the rate of heat dissipiation from the fluid. Neglect corner effect and any thermal resistance due to shell material . b) it is now required to hold the same quantity 10m3 of fluid in a spherericaal container lagged with the same insulating material . for the same heat flux , calculate the size of spherical shell and thickness of lagging *
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Answer:Calculate the rate of heat loss through the vertical walls of a boiler furnace of size 4
m by 3 m by 3 m high. The walls are constructed from an inner fire brick wall 25 cm
thick of thermal conductivity 0.4 W/mK, a layer of ceramic blanket insulation of
thermal conductivity 0.2 W/mK and 8 cm thick, and a steel protective layer of
thermal conductivity 55 W/mK and 2 mm thick. The inside temperature of the fire
brick layer was measured at 600o C and the temperature of the outside of the
insulation 600 C. Also find the interface temperature of layers.
Given:
Composite Wall
l= 4m b= 3m h= 3m
Area of rectangular wall lb = 4x3 = 12m2
L1 = 25 cm Fire brick
kı
= 0.4 W/mK
L2 =0.002m Steel
k2 = 54 W/mK
L3 = 0.08 m insulation
kı
= 0.2 W/mK
T1 = 6000 C
T2 = 600 C
Explanation: