Question

A composite wall is made up of an external thickness of brickwork 110 mm thick, inside which is a layer of fiberglass 75 mm thick. The fiberglass is faced internally by an insulating board 25 mm thick. The coefficients of thermal conductivity are as follows: Brickwork: 1.5 W/m-K Fiberglass: 0.04 W/m-K Insulating board: 0.06 W/m-K The surface transfer coefficient of the inside wall is 3.1 W/m2-K, while that of the outside wall is 2.5 W/m2-K. Take the internal ambient temperature as 10°C and the external temperature as 27°C. Determine the heat loss through such a wall 6 m high and 10 m long. (kW)

          A composite wall is made up of an external thickness of brickwork 110 mm thick, inside which is a layer of fiberglass 75 mm thick. The fiberglass is faced internally by an insulating board 25 mm thick. The coefficients of thermal conductivity are as follows:
Brickwork: 1.5 W/m-K
Fiberglass: 0.04 W/m-K
Insulating board: 0.06 W/m-K
The surface transfer coefficient of the inside wall is 3.1 W/m2-K, while that of the outside wall is 2.5 W/m2-K. Take the internal ambient temperature as 10°C and the external temperature as 27°C. Determine the heat loss through such a wall 6 m high and 10 m long. (kW)

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Added by Amanda D.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

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Solved by Expert Sri K

10/04/2022

Step 1

The thermal resistance (\(R\)) of a material is given by the formula \(R = \frac{d}{k}\), where \(d\) is the thickness of the material (in meters) and \(k\) is the thermal conductivity (in W/m-K). - For the brickwork, \(R_{brick} = \frac{0.11}{1.5} = 0.0733 \, Show more…

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A composite wall is made up of an external thickness of brickwork 110 mm thick, inside which is a layer of fiberglass 75 mm thick. The fiberglass is faced internally by an insulating board 25 mm thick. The coefficients of thermal conductivity are as follows: Brickwork: 1.5 W/m-K Fiberglass: 0.04 W/m-K Insulating board: 0.06 W/m-K The surface transfer coefficient of the inside wall is 3.1 W/m2-K, while that of the outside wall is 2.5 W/m2-K. Take the internal ambient temperature as 10°C and the external temperature as 27°C. Determine the heat loss through such a wall 6 m high and 10 m long. (kW)

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