Construction Materials, Methods and Techniques (MindTap Course List)
4th Edition
ISBN: 9781305086272
Author: William P. Spence, Eva Kultermann
Publisher: Cengage Learning
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Chapter 3, Problem 7RQ
To determine
The factor describing the overall thermal performance of a building
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Chapter 3 Solutions
Construction Materials, Methods and Techniques (MindTap Course List)
Ch. 3 - What are the major material groups?Ch. 3 - Prob. 2RQCh. 3 - What are the mechanical properties that define a...Ch. 3 - How does a tensile stress differ from a...Ch. 3 - Prob. 5RQCh. 3 - Prob. 6RQCh. 3 - Prob. 7RQCh. 3 - What is the most common form of chemical...Ch. 3 - Prob. 9RQCh. 3 - Prob. 10RQ
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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…arrow_forwardstate the differences between the coefficient of thermal expansion of steel and concrete.arrow_forwardhi please solve this question i will rate it if solved quicklyarrow_forward
- The freezer door of a side-by-side refrigerator needs to have its insulationreplaced. What is the area of the insulation needed in square inches?arrow_forwardCalculate the thickness of the masonry wall having thermalconductivity of 0.75 W/mK if the heat transfer is to be 80% of theheat transfer through a composite structural wall having athermal conductivity of 0.25 W/mK and a thickness of 100mm.Assume that both walls are subjected to same surfacetemperature.arrow_forwardQuestion 11 Which statement about thermal conductivity is FALSE? O a. The thermal conductivity of timber is greater in the longitudinal compared to the radial direction. O b. Lower density results in lower thermal conductivity. C. Thermal modification of wood reduces its thermal conductivity. Od. Thermal conductivity of air is higher compared to wood.arrow_forward
- Explain what is meant by permeability and describe how to interpret the permeability ratings of vapor retarders.arrow_forwardQuestion 5 Which statement about electrical conduction in wood is FALSE? O a. Electrical conduction increases very rapidly with increasing wood moisture content. O b. Electrical conduction is generally the same regardless of wood species. O C. Electrical conduction is greatest in the longitudinal direction of wood. Od. Electrical conduction increases with increased wood temperature.arrow_forwardPractical applications and significance of energy loss in pipes. Please also give one real life engineering application.arrow_forward
- Explain in precise terms the function of a vapor retarder in an exterior wall or roof assembly.arrow_forwardThe insulation to be used in a certain slot is as follows: fish paper 3/64 inch, Tufflex 3/32 inch, varniches cambric 3/64 inch, and top stick 1/8 inch. What is the total thickness of the insulation?arrow_forwardA cold-storage warehouse is to be constructed of a number of individual rooms that are maintained at various temperatures. The walls of one room are constructed of 4 inches thick masonry on the outside of 0.5 inches thick plywood on the side. Sandwiched between the masonry and plywood is glass fiber insulation that is 3.5 inches thick. The inside-wall temperature is to be maintained at −10°F and the outside-wall temperature is 70°F. As a first step in sizing the required cooling unit, determine the heat flow the wall on a per-square-foot basis.arrow_forward
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