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An exterior wall of a house may be approximated by a 4-in layer of common brick [k= 0.7 W/m.°C] followed by a 1.5-in layer of gypsum plaster [k= 0.48 W/m.°C]. What thick- ness of loosely packed rock-wool insulation [k=0.065 W/m·°C] should be added to reduce the heat loss (or gain) through the wall by 80 percent?

An exterior wall of a house may be approximated by a 4-in layer of common brick [k= 0.7 W/m.°C] followed by a 1.5-in layer of gypsum plaster [k= 0.48 W/m.°C]. What thick- ness of loosely packed rock-wool insulation [k=0.065 W/m·°C] should be added to reduce the heat loss (or gain) through the wall by 80 percent?

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
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An exterior wall of a house may be approximated by a 4-in layer of common brick [k= 0.7 W/m .°C] followed by a 1.5-in layer of gypsum plaster [k=0.48 W/m.°C]. What thick- ness of loosely packed rock-wool insulation [k=0.065 W/m ·°C] should be added to reduce the heat loss (or gain) through the wall by 80 percent?
Transcribed Image Text:An exterior wall of a house may be approximated by a 4-in layer of common brick [k= 0.7 W/m .°C] followed by a 1.5-in layer of gypsum plaster [k=0.48 W/m.°C]. What thick- ness of loosely packed rock-wool insulation [k=0.065 W/m ·°C] should be added to reduce the heat loss (or gain) through the wall by 80 percent?
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