Q1. Double glazed window is made of 2 glass panes of 6 mm thick each with an air gap of 6 mm between them. Assuming that the air layer is stagnant and only conduction is involved, determine the thermal resistance and overall heat transfer coefficient. The inside is exposed to convection with h 15 W/m2. K and the outside to 9 W/m2. K. Compare the values with that of a single glass of 12 mm thickness. The conductivity of the glass = 1.4 W/m. K and that for air is 0.025 W/m. K. h, = 15 Wim k Glass Air gap Glass k=14 W/mk k = 0.025 W/mK h =9 W/m'K 6 mm 6 mm 6 mm
Q1. Double glazed window is made of 2 glass panes of 6 mm thick each with an air gap of 6 mm between them. Assuming that the air layer is stagnant and only conduction is involved, determine the thermal resistance and overall heat transfer coefficient. The inside is exposed to convection with h 15 W/m2. K and the outside to 9 W/m2. K. Compare the values with that of a single glass of 12 mm thickness. The conductivity of the glass = 1.4 W/m. K and that for air is 0.025 W/m. K. h, = 15 Wim k Glass Air gap Glass k=14 W/mk k = 0.025 W/mK h =9 W/m'K 6 mm 6 mm 6 mm
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:Q1. Double glazed window is made of 2 glass panes of 6 mm thick each with an air gap of 6 mm between
them. Assuming that the air layer is stagnant and only conduction is involved, determine the thermal
resistance and overall heat transfer coefficient. The inside is exposed to convection with h 15 W/m?. K
and the outside to 9 W/m2. K. Compare the values with that of a single glass of 12 mm thickness. The
conductivity of the glass 1.4 W/m. K and that for air is 0.025 W/m. K.
h, = 15 Wim'k
Air gap Glass
Glass
k = 1.4 W/mk
k = 0.025 W/mk
h2 9 Wimk
6 mm
6 mm
6 mm
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