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
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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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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