An overhead 25-m-long, uninsulated industrial steam pipe of 100 mm diameter is routed through a building whose walls and air are at 25°C. Pressurized steam maintains a pipe surface temperature of 150°C, and the coefficient associated with natural convection is h = 10 W/m² • K. The surface emissivity is e = 0.8. (a) What is the rate of heat loss from the steam Jine? (b) If the steam is generated in a gas-fired boiler oper- ating at an efficiency of n, = 0.90 and natural gas is priced at C, = $0.01 per MJ, what is the annual cost of heat loss from the line?
An overhead 25-m-long, uninsulated industrial steam pipe of 100 mm diameter is routed through a building whose walls and air are at 25°C. Pressurized steam maintains a pipe surface temperature of 150°C, and the coefficient associated with natural convection is h = 10 W/m² • K. The surface emissivity is e = 0.8. (a) What is the rate of heat loss from the steam Jine? (b) If the steam is generated in a gas-fired boiler oper- ating at an efficiency of n, = 0.90 and natural gas is priced at C, = $0.01 per MJ, what is the annual cost of heat loss from the line?
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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Transcribed Image Text:Assignment on Radiation
An overhead 25-m-long, uninsulated industrial steam
pipe of 100 mm diameter is routed through a building
whose walls and air are at 25°C. Pressurized steam
maintains a pipe surface temperature of 150°C, and the
coefficient associated with natural convection is h = 10
W/m? · K. The surface emissivity is ɛ = 0.8.
(a) What is the rate of heat loss from the steam Jine?
(b) If the steam is generated in a gas-fired boiler oper-
ating at an efficiency of n = 0.90 and natural gas is
priced at C, = $0.01 per MJ, what is the annual
cost of heat loss from the line?
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