Air 20°C T, = 170°C Steam D=6.03 cm L= 60 m
2 inch outer diameter throughout a plastic sheet mill
a 60 m long section of a horizontal steam pipe
from one end to the other, on which it passes without comparison
is observed. Ambient air and surface temperatures
At 20 ° C, several hours measurements are the average of the exposed surfaces of the steam pipe.
shows that its temperature is 160 ° C. The outer surface of the pipe appears to be oxidized and
emissivity can be taken as 0.6. According to this;
a) Calculate the heat loss in the steam pipe.
b) Some steam is produced in a gas oven operating at 60% efficiency. Factory 105,500
kJ natural gas pays $ 1.10. If it is assumed that the factory operates all year (365 days), for this facility
calculating the annual cost of heat losses in the steam pipe.
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