(b) Consider the walls of a house of area 400 m with a 10 cm gap...
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(b) Consider the walls of a house of area 400 m with a 10 cm gap between the inside wall at 20C and the outside wall at -10C. Assume that the gap is filled with air and take the cross sectional area of an "air molecule" as 0.42 nm, the molecular weight as 28.8 g mol- and the heat capacity as Cvm - 2.5 R. [8] Calculate K of air at the average temperature in the wall. (a) [6] The actual value of value of k is 1.5 times higher than the theoretical one due to air currents in the walls. On this basis calculate the heat loss (kJ/day) through the walls. [6] Now, suppose the gap is filled with insulation which has a thermal conductivity of 0.046 J m's K-. Calculate the heat loss (kJ/day) through 400 m of wall with this 10 cm thick insulation. (b) Consider the walls of a house of area 400 m with a 10 cm gap between the inside wall at 20C and the outside wall at -10C. Assume that the gap is filled with air and take the cross sectional area of an "air molecule" as 0.42 nm, the molecular weight as 28.8 g mol- and the heat capacity as Cvm - 2.5 R. [8] Calculate K of air at the average temperature in the wall. (a) [6] The actual value of value of k is 1.5 times higher than the theoretical one due to air currents in the walls. On this basis calculate the heat loss (kJ/day) through the walls. [6] Now, suppose the gap is filled with insulation which has a thermal conductivity of 0.046 J m's K-. Calculate the heat loss (kJ/day) through 400 m of wall with this 10 cm thick insulation.
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Heat Transfer Through a Wall with Air Gap Assumptions The air gap can be modeled as a onedimensional ... View the full answer
Related Book For
Materials Science and Engineering An Introduction
ISBN: 978-0470419977
8th edition
Authors: William D. Callister Jr., David G. Rethwisch
Posted Date:
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