2. During a winter day, the window of a patio door with a height of 1.8 m and width of 1.0 m shows a frost line near its base. The room wall and air temperatures are 15°C. I lo ar Estimate the heat loss through the window due to free convection and radiation. Assume the window has a uniform temperature of 0°C and the emissiv- ity of the glass surface is 0.94. If the room has elec- tric baseboard heating, estimate the corresponding daily cost of the window heat loss for a utility rate of 0.18 $/kW h. EP. 26. bus id Window, 1.8 mx 1.0 m

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
2.
During a winter day, the window of a patio door with a
height of 1.8 m and width of 1.0 m shows a frost
line near its base. The room wall and air temperatures
are 15°C.
I lo ar
Estimate the heat loss through the window due to
free convection and radiation. Assume the window
has a uniform temperature of 0°C and the emissiv-
ity of the glass surface is 0.94. If the room has elec-
tric baseboard heating, estimate the corresponding
daily cost of the window heat loss for a utility rate
of 0.18 $/kW h.
EP. 26.
bus id
Window,
1.8 mx 1.0 m
Transcribed Image Text:2. During a winter day, the window of a patio door with a height of 1.8 m and width of 1.0 m shows a frost line near its base. The room wall and air temperatures are 15°C. I lo ar Estimate the heat loss through the window due to free convection and radiation. Assume the window has a uniform temperature of 0°C and the emissiv- ity of the glass surface is 0.94. If the room has elec- tric baseboard heating, estimate the corresponding daily cost of the window heat loss for a utility rate of 0.18 $/kW h. EP. 26. bus id Window, 1.8 mx 1.0 m
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