1] During a plant visit, it was noticed that a 12-m-long section of a 10-cm-diameter steam pipe is completely exposed o the ambient air. The temperature measurements indicate that the average temperature of the outer surface of the team pipe is 75°C when the ambient temperature is 5°C. There are also light winds in the area at 10 km/h. The missivity of the outer surface of the pipe is 0.8, and the average temperature of the surfaces surrounding the pipe, ncluding the sky, is estimated to be 0°C. Determine the amount of heat lost from the steam during a 10-h-long work lay. Steam is supplied by a gas-fired steam generator that has an efficiency of 80 percent, and the plant pays 1.05/therm of natural gas. If the pipe is insulated and 90 percent of the heat loss is saved, determine the amount of noney this facility will save a year as a result of insulating the steam pipes. Assume the plant operates every day of the ear for 10 h. State your assumptions. sur ɛ = 0.8 75°C 10 cm Steam pipe ///// 5°C 10 km/h a.) Amount of heat lost. A. 2.461x105 kJ/day B. 4.361x105 kJ/day C. 3.361x106 kJ/day D. 2.361x105 kJ/day b.) Money saved. A. $ 965 B. $ 985 C. $ 1065 D. $ 950
1] During a plant visit, it was noticed that a 12-m-long section of a 10-cm-diameter steam pipe is completely exposed o the ambient air. The temperature measurements indicate that the average temperature of the outer surface of the team pipe is 75°C when the ambient temperature is 5°C. There are also light winds in the area at 10 km/h. The missivity of the outer surface of the pipe is 0.8, and the average temperature of the surfaces surrounding the pipe, ncluding the sky, is estimated to be 0°C. Determine the amount of heat lost from the steam during a 10-h-long work lay. Steam is supplied by a gas-fired steam generator that has an efficiency of 80 percent, and the plant pays 1.05/therm of natural gas. If the pipe is insulated and 90 percent of the heat loss is saved, determine the amount of noney this facility will save a year as a result of insulating the steam pipes. Assume the plant operates every day of the ear for 10 h. State your assumptions. sur ɛ = 0.8 75°C 10 cm Steam pipe ///// 5°C 10 km/h a.) Amount of heat lost. A. 2.461x105 kJ/day B. 4.361x105 kJ/day C. 3.361x106 kJ/day D. 2.361x105 kJ/day b.) Money saved. A. $ 965 B. $ 985 C. $ 1065 D. $ 950
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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![[1] During a plant visit, it was noticed that a 12-m-long section of a 10-cm-diameter steam pipe is completely exposed
to the ambient air. The temperature measurements indicate that the average temperature of the outer surface of the
steam pipe is 75°C when the ambient temperature is 5°C. There are also light winds in the area at 10 km/h. The
emissivity of the outer surface of the pipe is 0.8, and the average temperature of the surfaces surrounding the pipe,
including the sky, is estimated to be 0°C. Determine the amount of heat lost from the steam during a 10-h-long work
day. Steam is supplied by a gas-fired steam generator that has an efficiency of 80 percent, and the plant pays
$1.05/therm of natural gas. If the pipe is insulated and 90 percent of the heat loss is saved, determine the amount of
money this facility will save a year as a result of insulating the steam pipes. Assume the plant operates every day of the
year for 10 h. State your assumptions.
T
= 0°C
surr
ɛ = 0.8
75°C
10 cm
Steam pipe
/////
5°C
10 km/h
a.) Amount of heat lost.
A. 2.461x105 kJ/day
B. 4.361x105 kJ/day
C. 3.361x105 kJ/day
D. 2.361x106 kJ/day
b.) Money saved.
A. $ 965
B. $ 985
C. $ 1065
D. $ 950](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7d9a1f96-3005-4e5f-bac4-a8efffbb5958%2F815b33b5-17c7-4bd7-a063-1730ca295fac%2Fznxscib_processed.png&w=3840&q=75)
Transcribed Image Text:[1] During a plant visit, it was noticed that a 12-m-long section of a 10-cm-diameter steam pipe is completely exposed
to the ambient air. The temperature measurements indicate that the average temperature of the outer surface of the
steam pipe is 75°C when the ambient temperature is 5°C. There are also light winds in the area at 10 km/h. The
emissivity of the outer surface of the pipe is 0.8, and the average temperature of the surfaces surrounding the pipe,
including the sky, is estimated to be 0°C. Determine the amount of heat lost from the steam during a 10-h-long work
day. Steam is supplied by a gas-fired steam generator that has an efficiency of 80 percent, and the plant pays
$1.05/therm of natural gas. If the pipe is insulated and 90 percent of the heat loss is saved, determine the amount of
money this facility will save a year as a result of insulating the steam pipes. Assume the plant operates every day of the
year for 10 h. State your assumptions.
T
= 0°C
surr
ɛ = 0.8
75°C
10 cm
Steam pipe
/////
5°C
10 km/h
a.) Amount of heat lost.
A. 2.461x105 kJ/day
B. 4.361x105 kJ/day
C. 3.361x105 kJ/day
D. 2.361x106 kJ/day
b.) Money saved.
A. $ 965
B. $ 985
C. $ 1065
D. $ 950
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