A masonry cavity wall consists of 100-mm common bricks, 90-mm air space, 100-mm concrete blocks made of lightweight aggregate, 20-mm air space, and 13-mm gypsum wallboard separated from the concrete block by 20-mm-thick (1 in x 3 in nominal) vertical furring whose center-to-center distance is 400 mm. One side of both air spaces is coated with a reflective film of ε = 0.05. The temperature difference across the air spaces can be taken to be 16.7°C with a mean air temperature of 10°C. The air space constitutes 81 percent of the heat transmission area, while the vertical furring and similar structures constitute 19 percent. The R-values for different materials are given in the table below. Construction 1. Outside surface, 24 km/h 2. Face brick, 100 mm 3. Air space, 90-mm, reflective with ε = 0.05 4. Concrete block, lightweight, 100-mm 5a. Air space, 20 mm, reflective with & =0.05 5b. Vertical ferring, 20 mm thick 6. Gypsum wallboard, 13 7. Inside surface, still air Determine the overall U-factor of the masonry cavity wall. R-value, m².°C/W Between At furring furring 0.030 0.030 0.12 0.12 0.45 0.45 0.27 0.49 --- 0.079 0.12 0.27 --- 0.94 0.079 0.12

A masonry cavity wall consists of 100-mm common bricks, 90-mm air space, 100-mm concrete blocks made of lightweight aggregate, 20-mm air space, and 13-mm gypsum wallboard separated from the concrete block by 20-mm-thick (1 in x 3 in nominal) vertical furring whose center-to-center distance is 400 mm. One side of both air spaces is coated with a reflective film of ε = 0.05. The temperature difference across the air spaces can be taken to be 16.7°C with a mean air temperature of 10°C. The air space constitutes 81 percent of the heat transmission area, while the vertical furring and similar structures constitute 19 percent. The R-values for different materials are given in the table below. Construction 1. Outside surface, 24 km/h 2. Face brick, 100 mm 3. Air space, 90-mm, reflective with ε = 0.05 4. Concrete block, lightweight, 100-mm 5a. Air space, 20 mm, reflective with & =0.05 5b. Vertical ferring, 20 mm thick 6. Gypsum wallboard, 13 7. Inside surface, still air Determine the overall U-factor of the masonry cavity wall. R-value, m².°C/W Between At furring furring 0.030 0.030 0.12 0.12 0.45 0.45 0.27 0.49 --- 0.079 0.12 0.27 --- 0.94 0.079 0.12

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Description: Required informationA masonry cavity wall consists of 100-mm common bricks, 90-mm air space, 100-mmconcrete blocks made of lightweight aggregate, 20-mm air space, and 13-mm gypsumwallboard separated from the concrete block by 20-mm-thick (1 in x 3 i

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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Required information
A masonry cavity wall consists of 100-mm common bricks, 90-mm air space, 100-mm
concrete blocks made of lightweight aggregate, 20-mm air space, and 13-mm gypsum
wallboard separated from the concrete block by 20-mm-thick (1 in x 3 in nominal) vertical
furring whose center-to-center distance is 400 mm. One side of both air spaces is
coated with a reflective film of = 0.05. The temperature difference across the air spaces
can be taken to be 16.7°C with a mean air temperature of 10°C. The air space constitutes
81 percent of the heat transmission area, while the vertical furring and similar structures
constitute 19 percent.
The R-values for different materials are given in the table below.
Construction
1. Outside surface, 24 km/h
2. Face brick, 100 mm
3. Air space, 90-mm, reflective with & =
0.05
4. Concrete block, lightweight, 100-mm
5a. Air space, 20 mm, reflective with &
=0.05
5b. Vertical ferring, 20 mm thick
6. Gypsum wallboard, 13
7. Inside surface, still air
Determine the overall U-factor of the masonry cavity wall.
The overall U-factor is 1.007 W/m².°C.
R-value, m².°C/W
Between At
furring furring
0.030
0.030
0.12
0.12
0.45
0.45
0.27
0.49
T
0.079
0.12
0.27
---
0.94
0.079
0.12

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