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 & = 0.8. (a) What is the rate of heat loss from the steam line? (b) If the steam is generated in a gas-fired boiler oper- ating at an efficiency of ny = 0.90 and natural gas is priced at C, = $0.01 per MJ, what is the annual cost of heat loss from the line? %3D %3D

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 & = 0.8. (a) What is the rate of heat loss from the steam line? (b) If the steam is generated in a gas-fired boiler oper- ating at an efficiency of ny = 0.90 and natural gas is priced at C, = $0.01 per MJ, what is the annual cost of heat loss from the line? %3D %3D

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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Question

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 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 ny = 0.90 and natural gas is
priced at C, = $0.01 per MJ, what is the annual
cost of heat loss from the line?
%3D

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heat and mass transfer An uninsulated steam pipe of 100-mm diameter is routed through a building whose walls and air are at 27°C. Pressurized steam maintains a pipe surface temperature of 147°C, and the coefficient associated with natural convection is h =10 W/m2.K. The surface emissivity is ɛ= 0.8. What is the rate of heat loss per unit length from the steam line?