Energy Balances, Costs and Insulation - A 100 meter long section of a steam pipe with an outer diameter of 10 cm passes through an open space at 15°C. The average temperature of the outer surface of the pipe is measured as 120°C. The combined convection (which includes radiation effects into h) coefficient on the outer surface of the pipe is 20 W/m²-K. (a) Determine the rate of heat loss from the steam pipe. (b) Determine the annual cost of this lost energy if steam is generated in a natural gas furnace that has an efficiency of 75% and the price of the natural gas is $0.82/therm (1 therm = 105,500 kJ).
Energy Balances, Costs and Insulation - A 100 meter long section of a steam pipe with an outer diameter of 10 cm passes through an open space at 15°C. The average temperature of the outer surface of the pipe is measured as 120°C. The combined convection (which includes radiation effects into h) coefficient on the outer surface of the pipe is 20 W/m²-K. (a) Determine the rate of heat loss from the steam pipe. (b) Determine the annual cost of this lost energy if steam is generated in a natural gas furnace that has an efficiency of 75% and the price of the natural gas is $0.82/therm (1 therm = 105,500 kJ).
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Energy Balances, Costs and Insulation - A 100 meter long section of a steam pipe with an outer
diameter of 10 cm passes through an open space at 15°C. The average temperature of the outer surface of the
pipe is measured as 120°C. The combined convection (which includes radiation effects into h) coefficient on
the outer surface of the pipe is 20 W/m²-K.
(a) Determine the rate of heat loss from the steam pipe.
(b) Determine the annual cost of this lost energy if steam is generated in a natural gas furnace that has an
efficiency of 75% and the price of the natural gas is $0.82/therm (1 therm = 105,500 kJ).
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