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window is made up of two panes of glass (with surface femperatures of 15 and 5 °C) that are separated by a gap of 3 cm. The said window has a height of 2 m and a width of 5 m. Initially, the gap is filled with air (flowing via temperature gradient). Then, this air space is partially evacuated such that the pressure is already 0.3 atm. This is done to lessen the heat transfer between the two panes of glass. Both glass surfaces have an emissivity of 0.9. Calculate the rate of heat transfer (W) through the panes.

window is made up of two panes of glass (with surface femperatures of 15 and 5 °C) that are separated by a gap of 3 cm. The said window has a height of 2 m and a width of 5 m. Initially, the gap is filled with air (flowing via temperature gradient). Then, this air space is partially evacuated such that the pressure is already 0.3 atm. This is done to lessen the heat transfer between the two panes of glass. Both glass surfaces have an emissivity of 0.9. Calculate the rate of heat transfer (W) through the panes.

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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A window is made up of two panes of glass (with surface temperatures of 15 °C and 5 °C) that are separated by a gap of 3 cm. The said window has a height of 2 m and a width of 5 m. Initially, the gap is filled with air (flowing via temperature gradient). Then, this air space is partially evacuated such that the pressure is already 0.3 atm. This is done to lessen the heat transfer between the two panes of glass. Both glass surfaces have an emissivity of 0.9. Calculate the rate of heat transfer (W) through the panes.
Transcribed Image Text:A window is made up of two panes of glass (with surface temperatures of 15 °C and 5 °C) that are separated by a gap of 3 cm. The said window has a height of 2 m and a width of 5 m. Initially, the gap is filled with air (flowing via temperature gradient). Then, this air space is partially evacuated such that the pressure is already 0.3 atm. This is done to lessen the heat transfer between the two panes of glass. Both glass surfaces have an emissivity of 0.9. Calculate the rate of heat transfer (W) through the panes.
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