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2. Two wooden panels of a building's wall are separated by a layer of insulation (Layer B). The inside temperature of the building is 26°C while the outside temperature is 10°C. The thickness of the inner-most wood panel (Layer A) is 20mm. The thickness of the outer-most wood panel (Layer C) is 25mm. The thermal conductivities are 0.16 W/(m K) for wood and 0.08 W/(m K) for insulation. The convective heat transfer coefficient for air is h, = 1.95 W/(m² K) at 10°C and h2 = 2.0 W/(m² K) at 26°C. The surface area of the wall is 35m². What thickness of insulation is required to keep the heat loss to 250 W? --.- Inside Outside A B

2. Two wooden panels of a building's wall are separated by a layer of insulation (Layer B). The inside temperature of the building is 26°C while the outside temperature is 10°C. The thickness of the inner-most wood panel (Layer A) is 20mm. The thickness of the outer-most wood panel (Layer C) is 25mm. The thermal conductivities are 0.16 W/(m K) for wood and 0.08 W/(m K) for insulation. The convective heat transfer coefficient for air is h, = 1.95 W/(m² K) at 10°C and h2 = 2.0 W/(m² K) at 26°C. The surface area of the wall is 35m². What thickness of insulation is required to keep the heat loss to 250 W? --.- Inside Outside A B

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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2. Two wooden panels of a building's wall are separated by a layer of insulation (Layer B). The inside temperature of the building is 26°C while the outside temperature is 10°C. The thickness of the inner-most wood panel (Layer A) is 20mm. The thickness of the outer-most wood panel (Layer C) is 25mm. The thermal conductivities are 0.16 W/(m K) for wood and 0.08 W/(m K) for insulation. The convective heat transfer coefficient for air is h, = 1.95 W/(m² K) at 10°C and h2 = 2.0 W/(m² K) at 26°C. The surface area of the wall is 35m?. What thickness of insulation is required to keep the heat loss to 250 w? -.- Inside Outside A
Transcribed Image Text:2. Two wooden panels of a building's wall are separated by a layer of insulation (Layer B). The inside temperature of the building is 26°C while the outside temperature is 10°C. The thickness of the inner-most wood panel (Layer A) is 20mm. The thickness of the outer-most wood panel (Layer C) is 25mm. The thermal conductivities are 0.16 W/(m K) for wood and 0.08 W/(m K) for insulation. The convective heat transfer coefficient for air is h, = 1.95 W/(m² K) at 10°C and h2 = 2.0 W/(m² K) at 26°C. The surface area of the wall is 35m?. What thickness of insulation is required to keep the heat loss to 250 w? -.- Inside Outside A
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