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5. Below is a section of an outside wall, with wood studs located 16" apart. brick (2.5 in) plywood (0.5 in). studs 1.5 in x 3.5 in batt insulation (3.5 in). 16 in sheet rock (0.5 in) In your calculations, you may assume the following thermal conductivities in W/m-K: Brick 0.72

5. Below is a section of an outside wall, with wood studs located 16" apart. brick (2.5 in) plywood (0.5 in). studs 1.5 in x 3.5 in batt insulation (3.5 in). 16 in sheet rock (0.5 in) In your calculations, you may assume the following thermal conductivities in W/m-K: Brick 0.72

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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5. Below is a section of an outside wall, with wood studs located 16" apart. brick (2.5 in) plywood (0.5 in). studs 1.5 in x 3.5 in batt insulation (3.5 in) 16 in sheet rock (0.5 in) In your calculations, you may assume the following thermal conductivities in W/m-K: Brick 0.72 Plywood 0.12 Insulation 0.034 Sheet Rock 0.22 Wood Stud 0.11 The sheet rock is in contact with room air at 21.1C with a heat transfer coefficient of 7.8 W/m'K. The heat transfer rate between the brick and the outdoor air at -17.7C is 12W/m'K. You also assume that the wall is 8ft tall may and 12 feet wide. a. Draw a thermal resistance circuit for the wall. b. Determine the rate of heat transfer for the wall. For your analysis, you may make the assumption that the plane normal to the heat flow is isothermal. c. What percent error would result if the studs were not included in the estimate?
Transcribed Image Text:5. Below is a section of an outside wall, with wood studs located 16" apart. brick (2.5 in) plywood (0.5 in). studs 1.5 in x 3.5 in batt insulation (3.5 in) 16 in sheet rock (0.5 in) In your calculations, you may assume the following thermal conductivities in W/m-K: Brick 0.72 Plywood 0.12 Insulation 0.034 Sheet Rock 0.22 Wood Stud 0.11 The sheet rock is in contact with room air at 21.1C with a heat transfer coefficient of 7.8 W/m'K. The heat transfer rate between the brick and the outdoor air at -17.7C is 12W/m'K. You also assume that the wall is 8ft tall may and 12 feet wide. a. Draw a thermal resistance circuit for the wall. b. Determine the rate of heat transfer for the wall. For your analysis, you may make the assumption that the plane normal to the heat flow is isothermal. c. What percent error would result if the studs were not included in the estimate?
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