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

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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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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