A house has a composite wall of wood, fiberglass insulation and plaster board. On a cold winter day, the convection heat transfer coefficients are ho = 60 W/m²/K and hi = 30 W/m²/K. Total wall surface is 350 m². Thermal conductivity: fiberglass k, = 0.038 W/m/K; wood k 0.12 W/m/K; plaster board kp = 0.17 W/m/K. = (a) Determine a symbolic expression for the total thermal resistance of the wall, including inside and outside convection effects for the prescribed conditions. (b) Determine the total heat loss through the wall.

A house has a composite wall of wood, fiberglass insulation and plaster board. On a cold winter day, the convection heat transfer coefficients are ho = 60 W/m²/K and hi = 30 W/m²/K. Total wall surface is 350 m². Thermal conductivity: fiberglass k, = 0.038 W/m/K; wood k 0.12 W/m/K; plaster board kp = 0.17 W/m/K. = (a) Determine a symbolic expression for the total thermal resistance of the wall, including inside and outside convection effects for the prescribed conditions. (b) Determine the total heat loss through the wall.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

A house has a composite wall of wood, fiberglass insulation and plaster board. On a cold winter
day, the convection heat transfer coefficients are ho 60 W/m²/K and h₁ = 30 W/m²/K.
Total wall surface is 350 m². Thermal conductivity: fiberglass kħ = 0.038 W/m/K; wood ks
0.12 W/m/K; plaster board kp = 0.17 W/m/K.
=
(a) Determine a symbolic expression for the total thermal resistance of the wall, including inside
and outside convection effects for the prescribed conditions.
(b) Determine the total heat loss through the wall.
Plaster board, k
Inside
h₁, T∞o, i = 20°C
111
Glass fiber blanket
(28 kg/m³), kb
10 mm 100 mm
Lb
Lp
Ls
=
Plywood siding, k
Outside
ho Too, o = -15°C
↑↑↑
20 mm

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