A steel pipe of 100 mm bore, and 10 mm bore thickness, carrying dry saturated steam at 28 bars, is insulated with a 40 mm layer of moulded insulation. This insulation in turn is insulated with a 60 mm layer of felt. The atmospheric temperature is 15 °C. Calculate: (i) the rate of heat loss by the steam per metre pipe length. (ii) the temperature of the outside

Elements Of Electromagnetics
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c) A steel pipe of 100 mm bore, and 10 mm bore thickness, carrying dry saturated steam at 28
bars, is insulated with a 40 mm layer of moulded insulation. This insulation in turn is
insulated with a 60 mm layer of felt. The atmospheric temperature is 15 °C.
Calculate:
(i) the rate of heat loss by the steam per metre pipe length.
(ii) the temperature of the outside
Dimensions in mm
surface.zzzzzzz
h₂-15 W/m²K
Steel
k₁=50 W/mK
AVALEHT
Ø100
1₂
"
Steam 28 bar
h-550 W/m²K,
Inner heat transfer coefficient = 550 W/m² K
Outer heat transfer coefficient = 15 W/m² K
Thermal conductivity of steel = 50 W/m K
Thermal conductivity of felt = 0.07 W/m K
Moulded
insulation
Felt
Moulded insulation
K₂=0.09 W/mK
Thermal conductivity of moulded insulation = 0.09 W/m
40
10.
A
60
15°C
Felt
K₁=0.07 W/mK
zzzzzzzz
Transcribed Image Text:c) A steel pipe of 100 mm bore, and 10 mm bore thickness, carrying dry saturated steam at 28 bars, is insulated with a 40 mm layer of moulded insulation. This insulation in turn is insulated with a 60 mm layer of felt. The atmospheric temperature is 15 °C. Calculate: (i) the rate of heat loss by the steam per metre pipe length. (ii) the temperature of the outside Dimensions in mm surface.zzzzzzz h₂-15 W/m²K Steel k₁=50 W/mK AVALEHT Ø100 1₂ " Steam 28 bar h-550 W/m²K, Inner heat transfer coefficient = 550 W/m² K Outer heat transfer coefficient = 15 W/m² K Thermal conductivity of steel = 50 W/m K Thermal conductivity of felt = 0.07 W/m K Moulded insulation Felt Moulded insulation K₂=0.09 W/mK Thermal conductivity of moulded insulation = 0.09 W/m 40 10. A 60 15°C Felt K₁=0.07 W/mK zzzzzzzz
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