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-„ 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). PLEASE NOTE that this question is from earlier chapters. It is not relevant to External and Internal flow.

-„ 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). PLEASE NOTE that this question is from earlier chapters. It is not relevant to External and Internal flow.

Introduction to Chemical Engineering Thermodynamics
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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Heat Transfer Question 

-„ 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). PLEASE NOTE that this question is from earlier chapters. It is not relevant to External and Internal flow.
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). PLEASE NOTE that this question is from earlier chapters. It is not relevant to External and Internal flow.
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