Fundamentals of Heat and Mass Transfer – Problem 1.9

A glass window of width W= 1 m and height H = 2 m is 5 mm thick and has a thermal conductivity of kg 1.4 W/m·K. If the inner and outer surface temperatures of the glass are 15°C and -20°C, respectively, on a cold winter day, what is the rate of heat loss through the glass? To reduce heat loss through windows, it is customary to use a double pane construction in which adjoining panes are separated by an air space. If the spacing is 10 mm and the glass surfaces in contact with the air have temperatures of 10°C and -15°C, what is the rate of heat loss from a 1 m x2 m window? The thermal conductivity of air is ka =0.024 W/m·K.

All sample problems and notes are based on the following textbook: Fundamentals of Heat and Mass Transfer Seventh Edition:

ISBN-13: 9780470501979

ISBN-10: 0470501979

Edition: 7

Author: Theodore L. BergmanAdrienne S. LavineFrank P. IncroperaDavid P. DeWitt

Publication date: 2011

Publisher: Wiley

Format: Hardcover 1072 pages

9780470501979-0470501979-Fundamentals of Heat and Mass Transfer

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