A wall exists between the inside that is 25 degree C and the outside that is 5 d

Question

A wall exists between the inside that is 25 degree C and the outside that is 5 degree C. The wall is 10 square meters in area and it is made of concrete that is 5 cm thick. The thermal conductivity of concrete is 0.6 W/m middot K. a. What is the heat flow rate through the wall? Two square meters of the wall is now replaced with a pane of glass that is 4 cm thick. Glass has a thermal conductivity of 0.8 W/m middot K. b. What is the heat flow rate through the wall with the window? Two more square meters of the wall is now replaced with a wooden door that is 5 cm thick. Wood has a thermal conductivity of 0.1 W/m middot K. c. What is the heat flow rate through the wall with the window and door? The wall is now covered with a layer of insulation of asbestos that is 2 cm thick. Asbestos has a thermal conductivity of 0.08 W/m middot K. d. What is the heat flow rate through the insulated wall with the window and door?

Explanation / Answer

a) heat flow rate = area * K*deltaT/x = 10* 0.6*20/0.05= 2.4kW                                                                          b)

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