A 16-m x 8.5-m section of wall of an industrial furnace burning natural gas is not insulated. outer surface of this section is measured to be 80°C. The temperature of the furnace room is 30'C, and the combined convection and radiation heat transfer coefficient at the surface of the outer furnace is 10 Wim K H is proposed to insulate this section of the furnace wall with glass wool insulation (k = 0.038 W/m K) in order to reduce the heat loss by 90 percent. The furnace operates continuously and has an efficiency of 78 percent. The price of the natural gas is $1.10therm (1 therm 105.500 kJ of energy content). If the installation of the insulation will cost $250 for materiais and labor, determine how long it will take for the insulation to pay for itself from the energy it saves (in years).
A 16-m x 8.5-m section of wall of an industrial furnace burning natural gas is not insulated. outer surface of this section is measured to be 80°C. The temperature of the furnace room is 30'C, and the combined convection and radiation heat transfer coefficient at the surface of the outer furnace is 10 Wim K H is proposed to insulate this section of the furnace wall with glass wool insulation (k = 0.038 W/m K) in order to reduce the heat loss by 90 percent. The furnace operates continuously and has an efficiency of 78 percent. The price of the natural gas is $1.10therm (1 therm 105.500 kJ of energy content). If the installation of the insulation will cost $250 for materiais and labor, determine how long it will take for the insulation to pay for itself from the energy it saves (in years).
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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A 16-m x 8.5-m section of wall of an industrial furnace burning natural gas is not insulated, and the temperature at the
outer surface of this section is measured to be 80°C. The temperature of the furnace room is 30°C, and the combined
convection and radiation heat transfer coefficient at the surface of the outer furnace is 10 W/m-K. i is proposed to
insulate this section of the furnace wall with glass wool insulation (k = 0.038 W/m-K) in order to reduce the heat loss by 90
%3D
percent.
The furnace operates continuously and has an efficiency of 78 percent. The price of the natural gas is $1.10/therm (1 therm 105 500 kJ of
energy content). If the installation of the insulation will cost $250 for materials and labor, determine how long it will take for the insulation tD
pay for itself from the energy it saves (in years).
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