4. A 3-m-high wall and 5-m-wide wall consists of long 18-cm x 30-cm cross section horizontal brick (k = 0.72 W/m.°C) with 12-cm x 24-cm fiberglass insulation material (k = 0.043 W/m.°C) as the center core. The bricks are separated by 3-cm-thich plaster (k= 0.22 W/m. °C). There are also 2-cm-thich plaster on each side of the brick and a 2-cm-thick foam (k = 0.026 W/m. °C) on the inner side of the wall, as shown in Fig. Q3. The indoor and outdoor temperatures are 20 °C and -10 °C, respectively, and the convection heat transfer coefficients on the inner and the outer sides are h1 = 10 W/m² °C and h2 = 25 W/m²°C, respectively. Assuming one-dimensional heat transfer and disregarding radiation, calculate the rate of heat transfer through the wall. Foam Plaster 11.5 cm Brick 2cm 2cm 18 cm- 2cm 30 cm 1.5 cm Fiberglass insulation

4. A 3-m-high wall and 5-m-wide wall consists of long 18-cm x 30-cm cross section horizontal brick (k = 0.72 W/m.°C) with 12-cm x 24-cm fiberglass insulation material (k = 0.043 W/m.°C) as the center core. The bricks are separated by 3-cm-thich plaster (k= 0.22 W/m. °C). There are also 2-cm-thich plaster on each side of the brick and a 2-cm-thick foam (k = 0.026 W/m. °C) on the inner side of the wall, as shown in Fig. Q3. The indoor and outdoor temperatures are 20 °C and -10 °C, respectively, and the convection heat transfer coefficients on the inner and the outer sides are h1 = 10 W/m² °C and h2 = 25 W/m²°C, respectively. Assuming one-dimensional heat transfer and disregarding radiation, calculate the rate of heat transfer through the wall. Foam Plaster 11.5 cm Brick 2cm 2cm 18 cm- 2cm 30 cm 1.5 cm Fiberglass insulation

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter14: Heat And Heat Transfer Methods

Section: Chapter Questions

Problem 54PE: A glass coffee pot has a circular bottom with a 9.00-cm diameter in contact with a heating element...

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Concept explainers

Energy transfer

The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.

Molar Specific Heat

Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)

Thermal Properties of Matter

Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.

Question

4.
A 3-m-high wall and 5-m-wide wall consists of long 18-cm x 30-cm cross section
horizontal brick (k = 0.72 W/m.°C) with 12-cm x 24-cm fiberglass insulation material (k =
0.043 W/m.°C) as the center core. The bricks are separated by 3-cm-thich plaster (k= 0.22
W/m. °C). There are also 2-cm-thich plaster on each side of the brick and a 2-cm-thick
foam (k = 0.026 W/m. °C) on the inner side of the wall, as shown in Fig. Q3. The indoor
and outdoor temperatures are 20 °C and -10 °C, respectively, and the convection heat
transfer coefficients on the inner and the outer sides are h1 = 10 W/m² °C and h₂ = 25
W/m² °C, respectively. Assuming one-dimensional heat transfer and disregarding
radiation, calculate the rate of heat transfer through the wall.
Foam
Plaster
11.5 cm
Brick
2cm 2cm
18 cm
2cm
30 cm
1.5 cm
Fiberglass.
insulation

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