8.) A 50-m-long section of a steam pipe whose outer diameter is 10 cm passes through an open space at 15°C. The average temperature of the outer surface of the pipe is measured to be 150°C. If the combined heat transfer coefficient on the outer surface of the pipe is 20 W/m2-°C, determine (a) the rate of heat loss from the steam pipe, T =15°C

Elements Of Electromagnetics
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8.) A 50-m-long section of a steam pipe whose outer diameter is 10 cm
passes through an open space at 15°C. The average temperature of the
outer surface of the pipe is measured to be 150°C. If the combined heat
transfer coefficient on the outer surface of the pipe is 20 W/m2-°C,
determine
(a) the rate of heat loss from the
steam pipe,
(b) the annual cost of this energy
lost if steam is generated in a
natural gas furnace that has an
efficiency of 75 percent and the
price of natural gas is $
0.52/therm (1 therm = 105,500
kJ), and
(c) the thickness of fiberglass
insulation (k = 0.035 W/m-°C)
needed in order to save 90
T = 15°C
air
150°C
Steam
50 m
percent of the heat lost. Assume
the pipe temperature to remain
Fiberglass
insulation
constant at 150°C.
Figure 5 Problem 8
Transcribed Image Text:8.) A 50-m-long section of a steam pipe whose outer diameter is 10 cm passes through an open space at 15°C. The average temperature of the outer surface of the pipe is measured to be 150°C. If the combined heat transfer coefficient on the outer surface of the pipe is 20 W/m2-°C, determine (a) the rate of heat loss from the steam pipe, (b) the annual cost of this energy lost if steam is generated in a natural gas furnace that has an efficiency of 75 percent and the price of natural gas is $ 0.52/therm (1 therm = 105,500 kJ), and (c) the thickness of fiberglass insulation (k = 0.035 W/m-°C) needed in order to save 90 T = 15°C air 150°C Steam 50 m percent of the heat lost. Assume the pipe temperature to remain Fiberglass insulation constant at 150°C. Figure 5 Problem 8
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