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A composite wall made of two materials consists of a 10 cm thick layer of brick (kb=0.15 W/m/K) and a layer of insulation (k₁= 0.04 W/m/K). Knowing that the surface temperature of the brick is 35 °C and that the contact temperature between the brick and insulation material is 30 °C, determine a) the insulation thickness if the surface temperature of the insulation must be lower than 20 °C, b) the heat transfer value kW/m²

A composite wall made of two materials consists of a 10 cm thick layer of brick (kb=0.15 W/m/K) and a layer of insulation (k₁= 0.04 W/m/K). Knowing that the surface temperature of the brick is 35 °C and that the contact temperature between the brick and insulation material is 30 °C, determine a) the insulation thickness if the surface temperature of the insulation must be lower than 20 °C, b) the heat transfer value kW/m²

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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**Problem Statement:** A composite wall made of two materials consists of a 10 cm thick layer of brick \((k_b = 0.15 \, \text{W/mK})\) and a layer of insulation \((k_i = 0.04 \, \text{W/mK})\). Knowing that the surface temperature of the brick is \(35 \, ^\circ\text{C}\) and that the contact temperature between the brick and insulation material is \(30 \, ^\circ\text{C}\), determine: a) The insulation thickness if the surface temperature of the insulation must be lower than \(20 \, ^\circ\text{C}\). b) The heat transfer value in kW/m².
Transcribed Image Text:**Problem Statement:** A composite wall made of two materials consists of a 10 cm thick layer of brick \((k_b = 0.15 \, \text{W/mK})\) and a layer of insulation \((k_i = 0.04 \, \text{W/mK})\). Knowing that the surface temperature of the brick is \(35 \, ^\circ\text{C}\) and that the contact temperature between the brick and insulation material is \(30 \, ^\circ\text{C}\), determine: a) The insulation thickness if the surface temperature of the insulation must be lower than \(20 \, ^\circ\text{C}\). b) The heat transfer value in kW/m².
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