The inner and outer surfaces of a pane of plain glass, which is 0.4 cm thick and has an area of 2 m x 2 m, have a temperature of 20°C and 5°C, respectively. Heat conduction coefficients can be found in the table in the following picture a) Calculate the amount of energy that is lost as heat through the window pane during 10 hours. b) Calculate the amount of energy that is lost as heat in the same period of time if a window consists of two panes of glass with the same area and 0.4 cm thickness, with an air gap of 1.2 cm between the panes of glass
The inner and outer surfaces of a pane of plain glass, which is 0.4 cm thick and has an area of 2 m x 2 m, have a temperature of 20°C and 5°C, respectively. Heat conduction coefficients can be found in the table in the following picture a) Calculate the amount of energy that is lost as heat through the window pane during 10 hours. b) Calculate the amount of energy that is lost as heat in the same period of time if a window consists of two panes of glass with the same area and 0.4 cm thickness, with an air gap of 1.2 cm between the panes of glass
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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Question
The inner and outer surfaces of a pane of plain glass, which is 0.4 cm thick and has an area of 2 m x 2 m, have a temperature of 20°C and 5°C, respectively. Heat conduction coefficients
can be found in the table in the following picture
a) Calculate the amount of energy that is lost as heat through the window pane during 10 hours.
b) Calculate the amount of energy that is lost as heat in the same period of time if a window consists of two
panes of glass with the same area and 0.4 cm thickness, with an air gap of 1.2 cm between
the panes of glass.
Transcribed Image Text:Thermal conductivities of some
materials at room conditions
Material
Diamond
Silver
Copper
Gold
Aluminum
Iron
Mercury (1)
Glass
Brick
Water (1)
Human skin
Wood (oak)
Helium (g)
Soft rubber
Glass fiber
Air (g)
Urethane, rigid foam
Thermal
conductivity,
W/m.K
2300
429
401
317
237
80.2
8.54
1.4
0.72
0.613
0.37
0.17
0.152
0.13
0.043
0.026
0.026
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