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i. Choose the wall that will give the lower coefficient of thermal conductivity.

i. Choose the wall that will give the lower coefficient of thermal conductivity.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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b) Table I shows the design of a composite wall (W1) with its elements and their corresponding thicknesses. Table 2 also shows the design of a wall (W2), its elements and the respective thicknesses. You are required to: i. ii. iii. Choose the wall that will give the lower coefficient of thermal conductivity. Give reasons and show calculation to justify the decision in (i). Comment on the general compliance of the selected wall to recommended thermal values. Table 1 - Properties of Composite Wall (W1): Layers External surface Rendering Block wall (Medium density) Polyurethene foam layer Cavity Block wall (Medium density) Rendering Internal surface Layers External surface Rendering Block wall (Medium density) Rendering Thickness Internal surface - 13 100 15 50 100 13 Thickness 13 Table 2 - Properties of Composite Wall (W2): 150 Units 13 mm mm mm mm mm mm Unit mm mm. mm Thermal Conductivity (W/m K) Thermal Conductivity (W/m K) Thermal Resistance (m² K/W) 0.07 0.17 0.12 Thermal Resistance (m² K/W) 0.07 0.12
Transcribed Image Text:b) Table I shows the design of a composite wall (W1) with its elements and their corresponding thicknesses. Table 2 also shows the design of a wall (W2), its elements and the respective thicknesses. You are required to: i. ii. iii. Choose the wall that will give the lower coefficient of thermal conductivity. Give reasons and show calculation to justify the decision in (i). Comment on the general compliance of the selected wall to recommended thermal values. Table 1 - Properties of Composite Wall (W1): Layers External surface Rendering Block wall (Medium density) Polyurethene foam layer Cavity Block wall (Medium density) Rendering Internal surface Layers External surface Rendering Block wall (Medium density) Rendering Thickness Internal surface - 13 100 15 50 100 13 Thickness 13 Table 2 - Properties of Composite Wall (W2): 150 Units 13 mm mm mm mm mm mm Unit mm mm. mm Thermal Conductivity (W/m K) Thermal Conductivity (W/m K) Thermal Resistance (m² K/W) 0.07 0.17 0.12 Thermal Resistance (m² K/W) 0.07 0.12
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