Consider a 1.5-m-high and 2.4-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k=0.78 W/m-K) separated by a 12-mm-wide stagnant airspace (k=0.026 W/m-K). Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner surface for a day during which the room is maintained at 22°C while the temperature of the outdoors is -5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be hy = 1O W/m2-K and h2 = 25 W/m2.K, respectively, and disregard any heat transfer by radiation. Glass 3 12 3 mm Frame The inner surface temperature of the window is °C.
Consider a 1.5-m-high and 2.4-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k=0.78 W/m-K) separated by a 12-mm-wide stagnant airspace (k=0.026 W/m-K). Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner surface for a day during which the room is maintained at 22°C while the temperature of the outdoors is -5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be hy = 1O W/m2-K and h2 = 25 W/m2.K, respectively, and disregard any heat transfer by radiation. Glass 3 12 3 mm Frame The inner surface temperature of the window is °C.
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:Consider a 1.5-m-high and 2.4-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k= 0.78 W/m-K) separated by
a 12-mm-wide stagnant airspace (k= 0.026 W/m-K). Determine the steady rate of heat transfer through this double-pane window and
the temperature of its inner surface for a day during which the room is maintained at 22°C while the temperature of the outdoors is
-5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be hy = 10 W/m2-K and h = 25
W/m2.K, respectively, and disregard any heat transfer by radiation.
Glass
3
12
3 mm
Frame
The inner surface temperature of the window is|
°C.
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